{"id":2804,"date":"2020-09-14T06:54:06","date_gmt":"2020-09-14T06:54:06","guid":{"rendered":"https:\/\/www.aluminiumceramicfiber.com\/?p=2804"},"modified":"2026-08-17T02:33:57","modified_gmt":"2026-08-17T02:33:57","slug":"methods-of-degassing-in-foundry","status":"publish","type":"post","link":"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/","title":{"rendered":"\u0637\u0631\u0642 \u0625\u0632\u0627\u0644\u0629 \u0627\u0644\u063a\u0627\u0632\u0627\u062a \u0641\u064a \u0645\u0635\u0627\u0646\u0639 \u0627\u0644\u0635\u0628"},"content":{"rendered":"<p class=\"PDq2pG_selectionAnchorContainer\" data-start=\"663\" data-end=\"1084\">Methods of degassing in foundry mainly include flux refining and inert gas degassing. These processes remove dissolved hydrogen and reduce oxide inclusions in molten aluminum before casting. Among them, inert gas purging with argon or nitrogen is widely used because fine gas bubbles provide a large contact area for hydrogen diffusion and inclusion flotation, improving casting quality and reducing porosity defects.<\/p>\n<div id=\"attachment_9602\" style=\"width: 1253px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-9602\" class=\"wp-image-9602 \" src=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-porosity.webp\" alt=\"porosity defects in aluminum slab casting\" width=\"1243\" height=\"613\" srcset=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-porosity.webp 1400w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-porosity-300x148.webp 300w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-porosity-1024x505.webp 1024w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-porosity-768x379.webp 768w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-porosity-18x9.webp 18w\" sizes=\"auto, (max-width: 1243px) 100vw, 1243px\" \/><p id=\"caption-attachment-9602\" class=\"wp-caption-text\"><em>porosity defects in aluminum slab casting<\/em><\/p><\/div>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/#What_Are_The_Main_Methods_Of_Degassing_In_Foundry\" >What Are The Main Methods Of Degassing In Foundry?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/#Why_Is_Degassing_Important_In_Aluminum_Foundry\" >Why Is Degassing Important In Aluminum Foundry?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/#How_Does_Hydrogen_Cause_Defects_In_Aluminum_Castings\" >How Does Hydrogen Cause Defects In Aluminum Castings?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/#How_Does_Inert_Gas_Degassing_Remove_Hydrogen_From_Molten_Aluminum\" >How Does Inert Gas Degassing Remove Hydrogen From Molten Aluminum?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/#What_Is_The_Working_Principle_Of_Inert_Gas_Purging\" >What Is The Working Principle Of Inert Gas Purging?<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/#Contact_Us_for_technical_consultation\" >Contact Us for technical consultation<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/#Why_Are_Fine_Bubbles_Important_In_Molten_Metal_Degassing\" >Why Are Fine Bubbles Important In Molten Metal Degassing?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/#How_Does_Bubble_Size_Affect_Hydrogen_Removal_Efficiency\" >How Does Bubble Size Affect Hydrogen Removal Efficiency?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/#How_Does_Flux_Refining_Help_Degas_Molten_Aluminum\" >How Does Flux Refining Help Degas Molten Aluminum?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/#What_Is_The_Role_Of_Flux_In_Aluminum_Degassing\" >What Is The Role Of Flux In Aluminum Degassing?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/#How_Do_Inert_Gas_Bubbles_Remove_Oxide_Inclusions_From_Molten_Aluminum\" >How Do Inert Gas Bubbles Remove Oxide Inclusions From Molten Aluminum?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/#Can_Degassing_Remove_Non-Metallic_Inclusions\" >Can Degassing Remove Non-Metallic Inclusions?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/#What_Factors_Affect_The_Efficiency_Of_Molten_Aluminum_Degassing\" >What Factors Affect The Efficiency Of Molten Aluminum Degassing?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/#How_Can_Degassing_Performance_Be_Improved\" >How Can Degassing Performance Be Improved?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/#What_Is_The_Difference_Between_Argon_And_Nitrogen_Degassing\" >What Is The Difference Between Argon And Nitrogen Degassing?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/#Which_Inert_Gas_Should_Be_Used_For_Aluminum_Degassing\" >Which Inert Gas Should Be Used For Aluminum Degassing?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/#Why_Is_Degassing_Usually_Combined_With_Filtration_In_Aluminum_Casting\" >Why Is Degassing Usually Combined With Filtration In Aluminum Casting?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/#Is_Removing_Hydrogen_Enough_To_Produce_Clean_Aluminum_Melt\" >Is Removing Hydrogen Enough To Produce Clean Aluminum Melt?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/#How_To_Choose_A_Suitable_Foundry_Degassing_Method\" >How To Choose A Suitable Foundry Degassing Method?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/#Which_Degassing_Method_Is_Best_For_Aluminum_Casting\" >Which Degassing Method Is Best For Aluminum Casting?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/#Conclusion_Understanding_The_Best_Methods_Of_Degassing_In_Foundry\" >Conclusion: Understanding The Best Methods Of Degassing In Foundry<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/methods-of-degassing-in-foundry\/#FAQ\" >FAQ<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 data-start=\"1086\" data-end=\"1139\"><span class=\"ez-toc-section\" id=\"What_Are_The_Main_Methods_Of_Degassing_In_Foundry\"><\/span>What Are The Main Methods Of Degassing In Foundry?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"1141\" data-end=\"1534\">Degassing is an essential step in the molten metal treatment process, especially for aluminum alloys. During melting, aluminum easily absorbs hydrogen from moisture in the atmosphere, wet charge materials, furnace atmosphere, and contaminated tools. Unlike most impurities, dissolved hydrogen cannot be removed by filtration alone because it exists at the atomic level inside the liquid metal.<\/p>\n<p data-start=\"1536\" data-end=\"1775\">When molten aluminum solidifies, hydrogen solubility decreases significantly. The excess hydrogen forms microscopic gas pores, which can negatively affect mechanical properties, pressure tightness, surface quality, and fatigue performance.<\/p>\n<p data-start=\"1777\" data-end=\"1849\">The two main <strong data-start=\"1790\" data-end=\"1819\">foundry degassing methods<\/strong> used in aluminum casting are:<\/p>\n<ol data-start=\"1851\" data-end=\"1898\">\n<li data-start=\"1851\" data-end=\"1871\"><strong data-start=\"1854\" data-end=\"1871\">Flux refining<\/strong><\/li>\n<li data-start=\"1872\" data-end=\"1898\"><strong data-start=\"1875\" data-end=\"1898\">Inert gas degassing<\/strong><\/li>\n<\/ol>\n<p data-start=\"1900\" data-end=\"2190\">Modern aluminum production often combines degassing with melt filtration because hydrogen and non-metallic inclusions are different types of contamination. Degassing removes dissolved gases, while ceramic filtration systems remove solid particles such as oxide films and carbide inclusions.<\/p>\n<div class=\"group TyagGW_tableContainer\">\n<div class=\"TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"2192\" data-end=\"2821\">\n<thead data-start=\"2192\" data-end=\"2266\">\n<tr data-start=\"2192\" data-end=\"2266\">\n<th class=\"last:pe-10\" data-start=\"2192\" data-end=\"2211\" data-col-size=\"sm\">Degassing Method<\/th>\n<th class=\"last:pe-10\" data-start=\"2211\" data-end=\"2229\" data-col-size=\"md\">Basic Principle<\/th>\n<th class=\"last:pe-10\" data-start=\"2229\" data-end=\"2243\" data-col-size=\"sm\">Main Target<\/th>\n<th class=\"last:pe-10\" data-start=\"2243\" data-end=\"2266\" data-col-size=\"sm\">Typical Application<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"2285\" data-end=\"2821\">\n<tr data-start=\"2285\" data-end=\"2423\">\n<td data-start=\"2285\" data-end=\"2301\" data-col-size=\"sm\">Flux refining<\/td>\n<td data-start=\"2301\" data-end=\"2365\" data-col-size=\"md\">Chemical reaction and generated gas bubbles remove impurities<\/td>\n<td data-col-size=\"sm\" data-start=\"2365\" data-end=\"2395\">Hydrogen + oxide inclusions<\/td>\n<td data-col-size=\"sm\" data-start=\"2395\" data-end=\"2423\">General aluminum melting<\/td>\n<\/tr>\n<tr data-start=\"2424\" data-end=\"2552\">\n<td data-start=\"2424\" data-end=\"2444\" data-col-size=\"sm\">Inert gas purging<\/td>\n<td data-col-size=\"md\" data-start=\"2444\" data-end=\"2505\">Argon or nitrogen bubbles absorb hydrogen and float upward<\/td>\n<td data-col-size=\"sm\" data-start=\"2505\" data-end=\"2526\">Dissolved hydrogen<\/td>\n<td data-col-size=\"sm\" data-start=\"2526\" data-end=\"2552\">Aluminum casting lines<\/td>\n<\/tr>\n<tr data-start=\"2553\" data-end=\"2705\">\n<td data-start=\"2553\" data-end=\"2581\" data-col-size=\"sm\">Rotary impeller degassing<\/td>\n<td data-col-size=\"md\" data-start=\"2581\" data-end=\"2649\">Rotor creates fine dispersed bubbles for better gas-metal contact<\/td>\n<td data-col-size=\"sm\" data-start=\"2649\" data-end=\"2673\">Hydrogen + inclusions<\/td>\n<td data-col-size=\"sm\" data-start=\"2673\" data-end=\"2705\">High-quality aluminum alloys<\/td>\n<\/tr>\n<tr data-start=\"2706\" data-end=\"2821\">\n<td data-start=\"2706\" data-end=\"2725\" data-col-size=\"sm\">Vacuum degassing<\/td>\n<td data-start=\"2725\" data-end=\"2769\" data-col-size=\"md\">Reduced pressure extracts dissolved gases<\/td>\n<td data-col-size=\"sm\" data-start=\"2769\" data-end=\"2793\">Dissolved gas removal<\/td>\n<td data-col-size=\"sm\" data-start=\"2793\" data-end=\"2821\">Special alloy production<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p data-start=\"2823\" data-end=\"3043\">Among these methods, rotary impeller degassing has become one of the most widely adopted technologies because it provides stable gas dispersion and higher hydrogen removal efficiency compared with simple lance injection.<\/p>\n<div id=\"attachment_9603\" style=\"width: 464px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-9603\" class=\" wp-image-9603\" src=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-degassing.webp\" alt=\"aluminum degassing\" width=\"454\" height=\"363\" srcset=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-degassing.webp 300w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-degassing-15x12.webp 15w\" sizes=\"auto, (max-width: 454px) 100vw, 454px\" \/><p id=\"caption-attachment-9603\" class=\"wp-caption-text\"><em>aluminum degassing<\/em><\/p><\/div>\n<h2 data-start=\"3050\" data-end=\"3099\"><span class=\"ez-toc-section\" id=\"Why_Is_Degassing_Important_In_Aluminum_Foundry\"><\/span>Why Is Degassing Important In Aluminum Foundry?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-start=\"3101\" data-end=\"3157\"><span class=\"ez-toc-section\" id=\"How_Does_Hydrogen_Cause_Defects_In_Aluminum_Castings\"><\/span>How Does Hydrogen Cause Defects In Aluminum Castings?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"3159\" data-end=\"3334\">Hydrogen is considered one of the most harmful dissolved gases in molten aluminum. The reason is the large difference in hydrogen solubility between liquid and solid aluminum.<\/p>\n<p data-start=\"3336\" data-end=\"3569\">At melting temperatures, aluminum can dissolve a relatively high amount of hydrogen. However, during solidification, the solubility decreases rapidly. If hydrogen cannot escape before the metal becomes solid, it forms internal pores.<\/p>\n<p data-start=\"3571\" data-end=\"3631\">Common casting defects caused by excessive hydrogen include:<\/p>\n<div class=\"group TyagGW_tableContainer\">\n<div class=\"TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"3633\" data-end=\"3998\">\n<thead data-start=\"3633\" data-end=\"3677\">\n<tr data-start=\"3633\" data-end=\"3677\">\n<th class=\"last:pe-10\" data-start=\"3633\" data-end=\"3642\" data-col-size=\"sm\">Defect<\/th>\n<th class=\"last:pe-10\" data-start=\"3642\" data-end=\"3650\" data-col-size=\"md\">Cause<\/th>\n<th class=\"last:pe-10\" data-start=\"3650\" data-end=\"3677\" data-col-size=\"sm\">Effect On Final Product<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"3692\" data-end=\"3998\">\n<tr data-start=\"3692\" data-end=\"3785\">\n<td data-start=\"3692\" data-end=\"3707\" data-col-size=\"sm\">Gas porosity<\/td>\n<td data-start=\"3707\" data-end=\"3754\" data-col-size=\"md\">Hydrogen precipitation during solidification<\/td>\n<td data-col-size=\"sm\" data-start=\"3754\" data-end=\"3785\">Reduced mechanical strength<\/td>\n<\/tr>\n<tr data-start=\"3786\" data-end=\"3846\">\n<td data-start=\"3786\" data-end=\"3806\" data-col-size=\"sm\">Internal cavities<\/td>\n<td data-col-size=\"md\" data-start=\"3806\" data-end=\"3830\">Poor hydrogen removal<\/td>\n<td data-col-size=\"sm\" data-start=\"3830\" data-end=\"3846\">Leakage risk<\/td>\n<\/tr>\n<tr data-start=\"3847\" data-end=\"3913\">\n<td data-start=\"3847\" data-end=\"3865\" data-col-size=\"sm\">Surface defects<\/td>\n<td data-start=\"3865\" data-end=\"3894\" data-col-size=\"md\">Gas expansion near surface<\/td>\n<td data-col-size=\"sm\" data-start=\"3894\" data-end=\"3913\">Poor appearance<\/td>\n<\/tr>\n<tr data-start=\"3914\" data-end=\"3998\">\n<td data-start=\"3914\" data-end=\"3932\" data-col-size=\"sm\">Fatigue failure<\/td>\n<td data-start=\"3932\" data-end=\"3974\" data-col-size=\"md\">Porosity acts as crack initiation point<\/td>\n<td data-col-size=\"sm\" data-start=\"3974\" data-end=\"3998\">Reduced service life<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p data-start=\"4000\" data-end=\"4197\">For applications such as automotive structural parts, aerospace components, aluminum foil stock, and high-strength extrusion billets, controlling hydrogen content is a critical quality requirement.<\/p>\n<p data-start=\"4199\" data-end=\"4350\">The purpose of an effective <strong data-start=\"4227\" data-end=\"4262\">aluminum melt degassing process<\/strong> is not simply to remove gas, but to achieve consistent melt cleanliness before casting.<\/p>\n<p data-start=\"4199\" data-end=\"4350\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-2820 aligncenter\" src=\"https:\/\/aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/Methods-Of-Degassing-In-Foundry-1.jpg\" alt=\"Methods Of Degassing In Foundry\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/Methods-Of-Degassing-In-Foundry-1.jpg 500w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/Methods-Of-Degassing-In-Foundry-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<h2 data-start=\"4357\" data-end=\"4425\"><span class=\"ez-toc-section\" id=\"How_Does_Inert_Gas_Degassing_Remove_Hydrogen_From_Molten_Aluminum\"><\/span>How Does Inert Gas Degassing Remove Hydrogen From Molten Aluminum?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-start=\"4427\" data-end=\"4481\"><span class=\"ez-toc-section\" id=\"What_Is_The_Working_Principle_Of_Inert_Gas_Purging\"><\/span>What Is The Working Principle Of Inert Gas Purging?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"4483\" data-end=\"4686\">Inert gas degassing works through hydrogen diffusion and flotation. During the process, argon or nitrogen is introduced into molten aluminum through a gas injection tube, porous plug, or rotary impeller.<\/p>\n<p data-start=\"4688\" data-end=\"4930\">Because the injected inert gas contains almost no hydrogen, the hydrogen partial pressure inside the gas bubble is close to zero. The hydrogen concentration in the surrounding molten aluminum is much higher, creating a concentration gradient.<\/p>\n<p data-start=\"4932\" data-end=\"5011\">Hydrogen atoms naturally diffuse from the molten aluminum into the gas bubbles.<\/p>\n<p data-start=\"5013\" data-end=\"5054\">The process can be summarized as follows:<\/p>\n<ol data-start=\"5056\" data-end=\"5275\">\n<li data-start=\"5056\" data-end=\"5103\">Inert gas bubbles enter the molten aluminum.<\/li>\n<li data-start=\"5104\" data-end=\"5152\">Dissolved hydrogen migrates into the bubbles.<\/li>\n<li data-start=\"5153\" data-end=\"5190\">The bubbles rise through the melt.<\/li>\n<li data-start=\"5191\" data-end=\"5234\">Hydrogen escapes from the metal surface.<\/li>\n<li data-start=\"5235\" data-end=\"5275\">Cleaner aluminum remains for casting.<\/li>\n<\/ol>\n<p data-start=\"5277\" data-end=\"5447\">This principle follows the gas-liquid equilibrium relationship described by Sieverts\u2019 law, where hydrogen solubility in liquid metal depends on hydrogen partial pressure.<\/p>\n<p data-start=\"5449\" data-end=\"5502\">The efficiency of hydrogen removal depends mainly on:<\/p>\n<ul data-start=\"5504\" data-end=\"5602\">\n<li data-start=\"5504\" data-end=\"5517\">Bubble size<\/li>\n<li data-start=\"5518\" data-end=\"5533\">Gas flow rate<\/li>\n<li data-start=\"5534\" data-end=\"5548\">Contact time<\/li>\n<li data-start=\"5549\" data-end=\"5567\">Melt temperature<\/li>\n<li data-start=\"5568\" data-end=\"5582\">Rotor design<\/li>\n<li data-start=\"5583\" data-end=\"5602\">Alloy composition<\/li>\n<\/ul>\n<div class=\"group TyagGW_tableContainer\">\n<div class=\"TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"5604\" data-end=\"5899\">\n<thead data-start=\"5604\" data-end=\"5650\">\n<tr data-start=\"5604\" data-end=\"5650\">\n<th class=\"last:pe-10\" data-start=\"5604\" data-end=\"5613\" data-col-size=\"sm\">Factor<\/th>\n<th class=\"last:pe-10\" data-start=\"5613\" data-end=\"5650\" data-col-size=\"sm\">Influence On Degassing Efficiency<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"5661\" data-end=\"5899\">\n<tr data-start=\"5661\" data-end=\"5714\">\n<td data-start=\"5661\" data-end=\"5679\" data-col-size=\"sm\">Smaller bubbles<\/td>\n<td data-col-size=\"sm\" data-start=\"5679\" data-end=\"5714\">Increase gas-metal contact area<\/td>\n<\/tr>\n<tr data-start=\"5715\" data-end=\"5772\">\n<td data-start=\"5715\" data-end=\"5739\" data-col-size=\"sm\">Longer residence time<\/td>\n<td data-start=\"5739\" data-end=\"5772\" data-col-size=\"sm\">Allow more hydrogen diffusion<\/td>\n<\/tr>\n<tr data-start=\"5773\" data-end=\"5830\">\n<td data-start=\"5773\" data-end=\"5797\" data-col-size=\"sm\">Stable gas dispersion<\/td>\n<td data-start=\"5797\" data-end=\"5830\" data-col-size=\"sm\">Improve treatment consistency<\/td>\n<\/tr>\n<tr data-start=\"5831\" data-end=\"5899\">\n<td data-start=\"5831\" data-end=\"5860\" data-col-size=\"sm\">Proper temperature control<\/td>\n<td data-start=\"5860\" data-end=\"5899\" data-col-size=\"sm\">Maintain effective hydrogen removal<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p data-start=\"5901\" data-end=\"6056\">Large bubbles may quickly escape from the melt with limited hydrogen absorption, while smaller bubbles provide much greater surface area for mass transfer.<\/p>\n<h1 style=\"text-align: center;\" data-start=\"6063\" data-end=\"6122\"><span class=\"ez-toc-section\" id=\"Contact_Us_for_technical_consultation\"><\/span><a style=\"background-color: #fff3c4; display: inline-block; padding: 12px 28px; border-radius: 30px; color: #7a5a2a; text-decoration: none; font-size: 18px; font-weight: bold; text-align: center; border: 1px solid #E6D3A1;\" href=\"https:\/\/web.whatsapp.com\/send?phone=8617344611163&amp;text=\" target=\"_blank\" rel=\"noopener\">Contact Us for technical consultation<\/a><span class=\"ez-toc-section-end\"><\/span><\/h1>\n<h2 data-start=\"6063\" data-end=\"6122\"><span class=\"ez-toc-section\" id=\"Why_Are_Fine_Bubbles_Important_In_Molten_Metal_Degassing\"><\/span>Why Are Fine Bubbles Important In Molten Metal Degassing?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-start=\"6124\" data-end=\"6183\"><span class=\"ez-toc-section\" id=\"How_Does_Bubble_Size_Affect_Hydrogen_Removal_Efficiency\"><\/span>How Does Bubble Size Affect Hydrogen Removal Efficiency?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"6185\" data-end=\"6280\">The effectiveness of inert gas degassing is closely related to the surface area of gas bubbles.<\/p>\n<p data-start=\"6282\" data-end=\"6480\">A single large bubble has a relatively small surface area compared with its volume. In contrast, thousands of small bubbles create a much larger total interface area between gas and molten aluminum.<\/p>\n<p data-start=\"6482\" data-end=\"6496\">This improves:<\/p>\n<ul data-start=\"6498\" data-end=\"6575\">\n<li data-start=\"6498\" data-end=\"6523\">Hydrogen diffusion rate<\/li>\n<li data-start=\"6524\" data-end=\"6546\">Inclusion attachment<\/li>\n<li data-start=\"6547\" data-end=\"6575\">Gas utilization efficiency<\/li>\n<\/ul>\n<p data-start=\"6577\" data-end=\"6700\">This is why industrial aluminum plants increasingly use <strong data-start=\"6633\" data-end=\"6670\">rotary impeller degassing systems<\/strong> instead of simple gas lances.<\/p>\n<div class=\"group TyagGW_tableContainer\">\n<div class=\"TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"6702\" data-end=\"6962\">\n<thead data-start=\"6702\" data-end=\"6775\">\n<tr data-start=\"6702\" data-end=\"6775\">\n<th class=\"last:pe-10\" data-start=\"6702\" data-end=\"6725\" data-col-size=\"sm\">Gas Injection Method<\/th>\n<th class=\"last:pe-10\" data-start=\"6725\" data-end=\"6750\" data-col-size=\"sm\">Bubble Characteristics<\/th>\n<th class=\"last:pe-10\" data-start=\"6750\" data-end=\"6775\" data-col-size=\"sm\">Degassing Performance<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"6790\" data-end=\"6962\">\n<tr data-start=\"6790\" data-end=\"6838\">\n<td data-start=\"6790\" data-end=\"6802\" data-col-size=\"sm\">Gas lance<\/td>\n<td data-start=\"6802\" data-end=\"6826\" data-col-size=\"sm\">Large, uneven bubbles<\/td>\n<td data-start=\"6826\" data-end=\"6838\" data-col-size=\"sm\">Moderate<\/td>\n<\/tr>\n<tr data-start=\"6839\" data-end=\"6883\">\n<td data-start=\"6839\" data-end=\"6853\" data-col-size=\"sm\">Porous plug<\/td>\n<td data-start=\"6853\" data-end=\"6871\" data-col-size=\"sm\">Smaller bubbles<\/td>\n<td data-col-size=\"sm\" data-start=\"6871\" data-end=\"6883\">Improved<\/td>\n<\/tr>\n<tr data-start=\"6884\" data-end=\"6962\">\n<td data-start=\"6884\" data-end=\"6902\" data-col-size=\"sm\">Rotary impeller<\/td>\n<td data-start=\"6902\" data-end=\"6943\" data-col-size=\"sm\">Fine and uniformly distributed bubbles<\/td>\n<td data-start=\"6943\" data-end=\"6962\" data-col-size=\"sm\">High efficiency<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p data-start=\"6964\" data-end=\"7172\">A properly designed rotor does more than inject gas. It creates controlled turbulence that distributes bubbles throughout the melt while avoiding excessive oxidation caused by unnecessary surface disturbance.<\/p>\n<div class=\"flex max-w-full flex-col gap-4 grow\">\n<div class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+&amp;]:mt-1\" dir=\"auto\" tabindex=\"0\" data-message-author-role=\"assistant\" data-message-id=\"e85d318a-898e-4483-8392-3a84654f4b47\" data-turn-start-message=\"true\" data-message-model-slug=\"gpt-5-6-t-mini-mini\">\n<div class=\"flex w-full flex-col gap-1 empty:hidden\">\n<div class=\"markdown prose dark:prose-invert wrap-break-word w-full light markdown-new-styling\">\n<h2 class=\"PDq2pG_selectionAnchorContainer\" data-start=\"0\" data-end=\"53\"><span class=\"ez-toc-section\" id=\"How_Does_Flux_Refining_Help_Degas_Molten_Aluminum\"><\/span>How Does Flux Refining Help Degas Molten Aluminum?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-start=\"55\" data-end=\"105\"><span class=\"ez-toc-section\" id=\"What_Is_The_Role_Of_Flux_In_Aluminum_Degassing\"><\/span>What Is The Role Of Flux In Aluminum Degassing?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"107\" data-end=\"366\">Flux refining is another traditional <strong data-start=\"144\" data-end=\"180\">molten aluminum degassing method<\/strong> used in foundries. Unlike inert gas purging, which mainly relies on physical hydrogen diffusion, flux refining uses chemical reactions between refining salts and impurities in the melt.<\/p>\n<p data-start=\"368\" data-end=\"591\">During flux treatment, refining agents release active gases or compounds when contacting molten aluminum. These generated bubbles provide a flotation effect, helping remove dissolved hydrogen and attach to oxide inclusions.<\/p>\n<p data-start=\"593\" data-end=\"717\">The rising bubbles transport impurities to the melt surface, where they combine with the flux layer and form removable slag.<\/p>\n<p data-start=\"719\" data-end=\"762\">The process includes three main mechanisms:<\/p>\n<ol data-start=\"764\" data-end=\"989\">\n<li data-start=\"764\" data-end=\"837\"><strong data-start=\"767\" data-end=\"789\">Hydrogen diffusion<\/strong> \u2013 dissolved hydrogen enters the rising bubbles.<\/li>\n<li data-start=\"838\" data-end=\"917\"><strong data-start=\"841\" data-end=\"864\">Inclusion flotation<\/strong> \u2013 oxide particles attach to bubbles and move upward.<\/li>\n<li data-start=\"918\" data-end=\"989\"><strong data-start=\"921\" data-end=\"940\">Slag absorption<\/strong> \u2013 flux captures impurities at the metal surface.<\/li>\n<\/ol>\n<div class=\"group TyagGW_tableContainer\">\n<div class=\"TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"991\" data-end=\"1289\">\n<thead data-start=\"991\" data-end=\"1038\">\n<tr data-start=\"991\" data-end=\"1038\">\n<th class=\"last:pe-10\" data-start=\"991\" data-end=\"1016\" data-col-size=\"sm\">Flux Refining Function<\/th>\n<th class=\"last:pe-10\" data-start=\"1016\" data-end=\"1028\" data-col-size=\"sm\">Mechanism<\/th>\n<th class=\"last:pe-10\" data-start=\"1028\" data-end=\"1038\" data-col-size=\"sm\">Result<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"1053\" data-end=\"1289\">\n<tr data-start=\"1053\" data-end=\"1135\">\n<td data-start=\"1053\" data-end=\"1072\" data-col-size=\"sm\">Hydrogen removal<\/td>\n<td data-col-size=\"sm\" data-start=\"1072\" data-end=\"1112\">Gas bubbles absorb dissolved hydrogen<\/td>\n<td data-col-size=\"sm\" data-start=\"1112\" data-end=\"1135\">Lower porosity risk<\/td>\n<\/tr>\n<tr data-start=\"1136\" data-end=\"1217\">\n<td data-start=\"1136\" data-end=\"1157\" data-col-size=\"sm\">Oxide modification<\/td>\n<td data-start=\"1157\" data-end=\"1188\" data-col-size=\"sm\">Flux reacts with oxide films<\/td>\n<td data-start=\"1188\" data-end=\"1217\" data-col-size=\"sm\">Improved melt cleanliness<\/td>\n<\/tr>\n<tr data-start=\"1218\" data-end=\"1289\">\n<td data-start=\"1218\" data-end=\"1235\" data-col-size=\"sm\">Slag formation<\/td>\n<td data-start=\"1235\" data-end=\"1271\" data-col-size=\"sm\">Impurities are absorbed into flux<\/td>\n<td data-start=\"1271\" data-end=\"1289\" data-col-size=\"sm\">Easier removal<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p data-start=\"1291\" data-end=\"1553\">However, flux refining efficiency depends heavily on flux composition, application method, alloy type, and operator control. Excessive flux addition may increase slag generation and metal loss, while insufficient treatment may leave unacceptable hydrogen levels.<\/p>\n<p data-start=\"1555\" data-end=\"1720\">For high-quality aluminum casting, flux refining is often combined with <strong>online\u00a0degassing equipment<\/strong> and filtration systems to achieve more stable melt quality.<\/p>\n<p style=\"text-align: center;\" data-start=\"2234\" data-end=\"2419\"><a style=\"background-color: #fff3c4; display: inline-block; padding: 12px 28px; border-radius: 30px; color: #7a5a2a; text-decoration: none; font-size: 18px; font-weight: bold; text-align: center; border: 1px solid #E6D3A1;\" href=\"https:\/\/www.adtechaluminum.com\/product\/degassing-equipment\/\" target=\"_blank\" rel=\"noopener\">Learn More About Our Molten-Aluminum Treatment<\/a><\/p>\n<h2 data-start=\"1727\" data-end=\"1799\"><span class=\"ez-toc-section\" id=\"How_Do_Inert_Gas_Bubbles_Remove_Oxide_Inclusions_From_Molten_Aluminum\"><\/span>How Do Inert Gas Bubbles Remove Oxide Inclusions From Molten Aluminum?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-start=\"1801\" data-end=\"1849\"><span class=\"ez-toc-section\" id=\"Can_Degassing_Remove_Non-Metallic_Inclusions\"><\/span>Can Degassing Remove Non-Metallic Inclusions?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"1851\" data-end=\"1991\">Although the primary purpose of degassing is hydrogen removal, inert gas bubbles can also contribute to inclusion removal through flotation.<\/p>\n<p data-start=\"1993\" data-end=\"2238\">Oxide inclusions in molten aluminum, especially aluminum oxide films (bifilms), can seriously affect mechanical properties. When inert gas bubbles pass through the melt, oxide particles may attach to the bubble surface due to interfacial forces.<\/p>\n<p data-start=\"2240\" data-end=\"2292\">The effectiveness of inclusion flotation depends on:<\/p>\n<ul data-start=\"2294\" data-end=\"2457\">\n<li data-start=\"2294\" data-end=\"2343\">Surface tension between gas and molten aluminum<\/li>\n<li data-start=\"2344\" data-end=\"2397\">Interaction between gas bubbles and oxide particles<\/li>\n<li data-start=\"2398\" data-end=\"2424\">Bubble size distribution<\/li>\n<li data-start=\"2425\" data-end=\"2442\">Melt turbulence<\/li>\n<li data-start=\"2443\" data-end=\"2457\">Holding time<\/li>\n<\/ul>\n<p data-start=\"2459\" data-end=\"2651\">A well-designed degassing process creates sufficient bubble dispersion without excessive turbulence. Excessive agitation may increase oxidation because fresh molten aluminum is exposed to air.<\/p>\n<p data-start=\"2653\" data-end=\"2779\">This is why industrial aluminum melt treatment focuses on controlled bubble generation rather than simply increasing gas flow.<\/p>\n<div id=\"attachment_9604\" style=\"width: 670px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-9604\" class=\"size-full wp-image-9604\" src=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/7112_HU2XLKyX.webp\" alt=\"online degassing equipment\" width=\"660\" height=\"494\" srcset=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/7112_HU2XLKyX.webp 660w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/7112_HU2XLKyX-300x225.webp 300w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/7112_HU2XLKyX-16x12.webp 16w\" sizes=\"auto, (max-width: 660px) 100vw, 660px\" \/><p id=\"caption-attachment-9604\" class=\"wp-caption-text\"><em>online degassing equipment<\/em><\/p><\/div>\n<h2 data-start=\"2786\" data-end=\"2852\"><span class=\"ez-toc-section\" id=\"What_Factors_Affect_The_Efficiency_Of_Molten_Aluminum_Degassing\"><\/span>What Factors Affect The Efficiency Of Molten Aluminum Degassing?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-start=\"2854\" data-end=\"2899\"><span class=\"ez-toc-section\" id=\"How_Can_Degassing_Performance_Be_Improved\"><\/span>How Can Degassing Performance Be Improved?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"2901\" data-end=\"3064\">The performance of an <strong data-start=\"2923\" data-end=\"2958\">aluminum melt degassing process<\/strong> depends on multiple operating parameters. Gas type alone does not determine final hydrogen concentration.<\/p>\n<div class=\"group TyagGW_tableContainer\">\n<div class=\"TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"3066\" data-end=\"3554\">\n<thead data-start=\"3066\" data-end=\"3101\">\n<tr data-start=\"3066\" data-end=\"3101\">\n<th class=\"last:pe-10\" data-start=\"3066\" data-end=\"3078\" data-col-size=\"sm\">Parameter<\/th>\n<th class=\"last:pe-10\" data-start=\"3078\" data-end=\"3101\" data-col-size=\"md\">Effect On Degassing<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"3112\" data-end=\"3554\">\n<tr data-start=\"3112\" data-end=\"3196\">\n<td data-start=\"3112\" data-end=\"3126\" data-col-size=\"sm\">Bubble size<\/td>\n<td data-start=\"3126\" data-end=\"3196\" data-col-size=\"md\">Smaller bubbles provide greater surface area for hydrogen transfer<\/td>\n<\/tr>\n<tr data-start=\"3197\" data-end=\"3265\">\n<td data-start=\"3197\" data-end=\"3213\" data-col-size=\"sm\">Gas flow rate<\/td>\n<td data-start=\"3213\" data-end=\"3265\" data-col-size=\"md\">Controls bubble quantity and treatment intensity<\/td>\n<\/tr>\n<tr data-start=\"3266\" data-end=\"3331\">\n<td data-start=\"3266\" data-end=\"3280\" data-col-size=\"sm\">Rotor speed<\/td>\n<td data-start=\"3280\" data-end=\"3331\" data-col-size=\"md\">Determines gas dispersion and mixing efficiency<\/td>\n<\/tr>\n<tr data-start=\"3332\" data-end=\"3399\">\n<td data-start=\"3332\" data-end=\"3349\" data-col-size=\"sm\">Treatment time<\/td>\n<td data-col-size=\"md\" data-start=\"3349\" data-end=\"3399\">Allows hydrogen diffusion to reach equilibrium<\/td>\n<\/tr>\n<tr data-start=\"3400\" data-end=\"3472\">\n<td data-start=\"3400\" data-end=\"3419\" data-col-size=\"sm\">Melt temperature<\/td>\n<td data-col-size=\"md\" data-start=\"3419\" data-end=\"3472\">Affects hydrogen solubility and reaction behavior<\/td>\n<\/tr>\n<tr data-start=\"3473\" data-end=\"3554\">\n<td data-start=\"3473\" data-end=\"3493\" data-col-size=\"sm\">Alloy composition<\/td>\n<td data-col-size=\"md\" data-start=\"3493\" data-end=\"3554\">Different alloys have different purification requirements<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p data-start=\"3556\" data-end=\"3955\">Among these factors, bubble size is one of the most important. Fine bubbles increase the gas-metal interface area, allowing hydrogen to transfer more efficiently from the melt into the gas phase. Research on aluminum melt treatment has shown that rotary impeller systems improve hydrogen removal by creating highly dispersed bubbles throughout the liquid metal.<\/p>\n<p data-start=\"3957\" data-end=\"4002\">A practical degassing process should balance:<\/p>\n<ul data-start=\"4004\" data-end=\"4101\">\n<li data-start=\"4004\" data-end=\"4033\">Hydrogen removal efficiency<\/li>\n<li data-start=\"4034\" data-end=\"4051\">Gas consumption<\/li>\n<li data-start=\"4052\" data-end=\"4068\">Treatment time<\/li>\n<li data-start=\"4069\" data-end=\"4081\">Metal loss<\/li>\n<li data-start=\"4082\" data-end=\"4101\">Oxidation control<\/li>\n<\/ul>\n<p data-start=\"4103\" data-end=\"4239\">Simply increasing gas flow does not always improve results because oversized bubbles may escape quickly without sufficient contact time.<\/p>\n<h2 data-start=\"4246\" data-end=\"4308\"><span class=\"ez-toc-section\" id=\"What_Is_The_Difference_Between_Argon_And_Nitrogen_Degassing\"><\/span>What Is The Difference Between Argon And Nitrogen Degassing?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-start=\"4310\" data-end=\"4367\"><span class=\"ez-toc-section\" id=\"Which_Inert_Gas_Should_Be_Used_For_Aluminum_Degassing\"><\/span>Which Inert Gas Should Be Used For Aluminum Degassing?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"4369\" data-end=\"4458\">Argon and nitrogen are the two most common gases used in <strong data-start=\"4426\" data-end=\"4457\">inert gas degassing systems<\/strong>.<\/p>\n<p data-start=\"4460\" data-end=\"4619\">Both gases work through the same principle: hydrogen diffuses from molten aluminum into the gas bubbles because of the difference in hydrogen partial pressure.<\/p>\n<p data-start=\"4621\" data-end=\"4682\">However, their practical applications are slightly different.<\/p>\n<div class=\"group TyagGW_tableContainer\">\n<div class=\"TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"4684\" data-end=\"5052\">\n<thead data-start=\"4684\" data-end=\"4737\">\n<tr data-start=\"4684\" data-end=\"4737\">\n<th class=\"last:pe-10\" data-start=\"4684\" data-end=\"4697\" data-col-size=\"sm\">Comparison<\/th>\n<th class=\"last:pe-10\" data-start=\"4697\" data-end=\"4715\" data-col-size=\"sm\">Argon Degassing<\/th>\n<th class=\"last:pe-10\" data-start=\"4715\" data-end=\"4737\" data-col-size=\"md\">Nitrogen Degassing<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"4752\" data-end=\"5052\">\n<tr data-start=\"4752\" data-end=\"4844\">\n<td data-start=\"4752\" data-end=\"4772\" data-col-size=\"sm\">Chemical activity<\/td>\n<td data-start=\"4772\" data-end=\"4791\" data-col-size=\"sm\">Completely inert<\/td>\n<td data-col-size=\"md\" data-start=\"4791\" data-end=\"4844\">Generally inert under aluminum casting conditions<\/td>\n<\/tr>\n<tr data-start=\"4845\" data-end=\"4892\">\n<td data-start=\"4845\" data-end=\"4872\" data-col-size=\"sm\">Hydrogen removal ability<\/td>\n<td data-col-size=\"sm\" data-start=\"4872\" data-end=\"4884\">Excellent<\/td>\n<td data-col-size=\"md\" data-start=\"4884\" data-end=\"4892\">Good<\/td>\n<\/tr>\n<tr data-start=\"4893\" data-end=\"4918\">\n<td data-start=\"4893\" data-end=\"4900\" data-col-size=\"sm\">Cost<\/td>\n<td data-start=\"4900\" data-end=\"4909\" data-col-size=\"sm\">Higher<\/td>\n<td data-start=\"4909\" data-end=\"4918\" data-col-size=\"md\">Lower<\/td>\n<\/tr>\n<tr data-start=\"4919\" data-end=\"5002\">\n<td data-start=\"4919\" data-end=\"4932\" data-col-size=\"sm\">Common use<\/td>\n<td data-start=\"4932\" data-end=\"4971\" data-col-size=\"sm\">Premium alloys and critical castings<\/td>\n<td data-col-size=\"md\" data-start=\"4971\" data-end=\"5002\">General aluminum production<\/td>\n<\/tr>\n<tr data-start=\"5003\" data-end=\"5052\">\n<td data-start=\"5003\" data-end=\"5022\" data-col-size=\"sm\">Risk of reaction<\/td>\n<td data-start=\"5022\" data-end=\"5033\" data-col-size=\"sm\">Very low<\/td>\n<td data-start=\"5033\" data-end=\"5052\" data-col-size=\"md\">Alloy dependent<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p data-start=\"5054\" data-end=\"5279\">Argon is often selected for applications requiring maximum melt cleanliness because it provides stable inert conditions. Nitrogen is widely used where cost efficiency is important and alloy requirements allow its application.<\/p>\n<p data-start=\"5281\" data-end=\"5348\">In practice, the choice between argon and nitrogen should consider:<\/p>\n<ul data-start=\"5350\" data-end=\"5439\">\n<li data-start=\"5350\" data-end=\"5367\">Alloy chemistry<\/li>\n<li data-start=\"5368\" data-end=\"5393\">Required hydrogen level<\/li>\n<li data-start=\"5394\" data-end=\"5421\">Casting quality standards<\/li>\n<li data-start=\"5422\" data-end=\"5439\">Production cost<\/li>\n<\/ul>\n<p data-start=\"5441\" data-end=\"5643\">The gas purity is also important. Moisture or oxygen contamination in the gas supply can introduce additional hydrogen sources and oxide formation during treatment.<\/p>\n<h2 data-start=\"5650\" data-end=\"5722\"><span class=\"ez-toc-section\" id=\"Why_Is_Degassing_Usually_Combined_With_Filtration_In_Aluminum_Casting\"><\/span>Why Is Degassing Usually Combined With Filtration In Aluminum Casting?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-start=\"5724\" data-end=\"5786\"><span class=\"ez-toc-section\" id=\"Is_Removing_Hydrogen_Enough_To_Produce_Clean_Aluminum_Melt\"><\/span>Is Removing Hydrogen Enough To Produce Clean Aluminum Melt?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"5788\" data-end=\"5838\">Degassing and filtration solve different problems.<\/p>\n<p data-start=\"5840\" data-end=\"6033\">Hydrogen exists as dissolved gas atoms, while inclusions are solid particles suspended in the melt. Therefore, a degassing system alone cannot completely remove all microscopic oxide particles.<\/p>\n<p data-start=\"6035\" data-end=\"6103\">A complete <strong data-start=\"6046\" data-end=\"6084\">aluminum melt purification process<\/strong> normally includes:<\/p>\n<ol data-start=\"6105\" data-end=\"6196\">\n<li data-start=\"6105\" data-end=\"6123\">Furnace melting<\/li>\n<li data-start=\"6124\" data-end=\"6140\">Flux refining<\/li>\n<li data-start=\"6141\" data-end=\"6163\">Degassing treatment<\/li>\n<li data-start=\"6164\" data-end=\"6185\">Ceramic filtration<\/li>\n<li data-start=\"6186\" data-end=\"6196\">Casting<\/li>\n<\/ol>\n<div class=\"group TyagGW_tableContainer\">\n<div class=\"TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"6198\" data-end=\"6474\">\n<thead data-start=\"6198\" data-end=\"6246\">\n<tr data-start=\"6198\" data-end=\"6246\">\n<th class=\"last:pe-10\" data-start=\"6198\" data-end=\"6218\" data-col-size=\"sm\">Treatment Process<\/th>\n<th class=\"last:pe-10\" data-start=\"6218\" data-end=\"6246\" data-col-size=\"md\">Main Contaminant Removed<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"6257\" data-end=\"6474\">\n<tr data-start=\"6257\" data-end=\"6316\">\n<td data-start=\"6257\" data-end=\"6273\" data-col-size=\"sm\">Flux refining<\/td>\n<td data-start=\"6273\" data-end=\"6316\" data-col-size=\"md\">Oxides, slag, some dissolved impurities<\/td>\n<\/tr>\n<tr data-start=\"6317\" data-end=\"6351\">\n<td data-start=\"6317\" data-end=\"6329\" data-col-size=\"sm\">Degassing<\/td>\n<td data-start=\"6329\" data-end=\"6351\" data-col-size=\"md\">Dissolved hydrogen<\/td>\n<\/tr>\n<tr data-start=\"6352\" data-end=\"6398\">\n<td data-start=\"6352\" data-end=\"6378\" data-col-size=\"sm\">Ceramic foam filtration<\/td>\n<td data-col-size=\"md\" data-start=\"6378\" data-end=\"6398\">Solid inclusions<\/td>\n<\/tr>\n<tr data-start=\"6399\" data-end=\"6474\">\n<td data-start=\"6399\" data-end=\"6422\" data-col-size=\"sm\">Cartridge filtration<\/td>\n<td data-col-size=\"md\" data-start=\"6422\" data-end=\"6474\">Fine particles and high cleanliness requirements<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p data-start=\"6476\" data-end=\"6678\">For applications such as aerospace alloys, battery foil, can stock, and high-performance extrusion materials, degassing is usually followed by advanced filtration to achieve consistent melt cleanliness.<\/p>\n<p data-start=\"6680\" data-end=\"6927\">A ceramic foam filter for aluminum filtration is commonly installed after degassing because it can capture remaining non-metallic inclusions before the metal enters the casting process.<\/p>\n<div id=\"attachment_9524\" style=\"width: 1061px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-9524\" class=\" wp-image-9524\" src=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/07\/3998_nFVxjodz-scaled.webp\" alt=\"ceramic foam filter\" width=\"1051\" height=\"701\" srcset=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/07\/3998_nFVxjodz-scaled.webp 2560w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/07\/3998_nFVxjodz-300x200.webp 300w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/07\/3998_nFVxjodz-1024x683.webp 1024w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/07\/3998_nFVxjodz-768x512.webp 768w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/07\/3998_nFVxjodz-1536x1024.webp 1536w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/07\/3998_nFVxjodz-2048x1365.webp 2048w\" sizes=\"auto, (max-width: 1051px) 100vw, 1051px\" \/><p id=\"caption-attachment-9524\" class=\"wp-caption-text\"><em>ceramic foam filter<\/em><\/p><\/div>\n<h2 data-start=\"6934\" data-end=\"6986\"><span class=\"ez-toc-section\" id=\"How_To_Choose_A_Suitable_Foundry_Degassing_Method\"><\/span>How To Choose A Suitable Foundry Degassing Method?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 data-start=\"6988\" data-end=\"7043\"><span class=\"ez-toc-section\" id=\"Which_Degassing_Method_Is_Best_For_Aluminum_Casting\"><\/span>Which Degassing Method Is Best For Aluminum Casting?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p data-start=\"7045\" data-end=\"7202\">There is no single best degassing method for every foundry. The correct solution depends on alloy requirements, casting method, and required product quality.<\/p>\n<div class=\"group TyagGW_tableContainer\">\n<div class=\"TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"7204\" data-end=\"7510\">\n<thead data-start=\"7204\" data-end=\"7261\">\n<tr data-start=\"7204\" data-end=\"7261\">\n<th class=\"last:pe-10\" data-start=\"7204\" data-end=\"7229\" data-col-size=\"sm\">Production Requirement<\/th>\n<th class=\"last:pe-10\" data-start=\"7229\" data-end=\"7261\" data-col-size=\"sm\">Recommended Degassing Method<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"7272\" data-end=\"7510\">\n<tr data-start=\"7272\" data-end=\"7336\">\n<td data-start=\"7272\" data-end=\"7299\" data-col-size=\"sm\">General aluminum casting<\/td>\n<td data-col-size=\"sm\" data-start=\"7299\" data-end=\"7336\">Flux refining or nitrogen purging<\/td>\n<\/tr>\n<tr data-start=\"7337\" data-end=\"7390\">\n<td data-start=\"7337\" data-end=\"7361\" data-col-size=\"sm\">Automotive components<\/td>\n<td data-col-size=\"sm\" data-start=\"7361\" data-end=\"7390\">Rotary impeller degassing<\/td>\n<\/tr>\n<tr data-start=\"7391\" data-end=\"7449\">\n<td data-start=\"7391\" data-end=\"7410\" data-col-size=\"sm\">Aerospace alloys<\/td>\n<td data-start=\"7410\" data-end=\"7449\" data-col-size=\"sm\">Argon rotary degassing + filtration<\/td>\n<\/tr>\n<tr data-start=\"7450\" data-end=\"7510\">\n<td data-start=\"7450\" data-end=\"7483\" data-col-size=\"sm\">Large-scale continuous casting<\/td>\n<td data-start=\"7483\" data-end=\"7510\" data-col-size=\"sm\">Online degassing system<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p data-start=\"7512\" data-end=\"7700\">For modern aluminum casting lines, a rotary impeller system provides better process stability because gas dispersion, treatment time, and rotor operation can be controlled more accurately.<\/p>\n<p data-start=\"7702\" data-end=\"7958\">An industrial aluminum degassing system typically integrates gas control, rotor assembly, and treatment chamber design to maintain consistent hydrogen removal during continuous production.<\/p>\n<h2 data-start=\"7965\" data-end=\"8033\"><span class=\"ez-toc-section\" id=\"Conclusion_Understanding_The_Best_Methods_Of_Degassing_In_Foundry\"><\/span>Conclusion: Understanding The Best Methods Of Degassing In Foundry<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p data-start=\"8035\" data-end=\"8335\">The main <strong data-start=\"8044\" data-end=\"8079\">methods of degassing in foundry<\/strong> include flux refining and inert gas degassing. Among them, inert gas treatment using argon or nitrogen remains the most widely applied approach because it removes dissolved hydrogen through bubble diffusion and improves melt cleanliness through flotation.<\/p>\n<p data-start=\"8337\" data-end=\"8647\">The effectiveness of degassing depends not only on the gas type but also on bubble size, gas dispersion, treatment time, and equipment design. Rotary impeller degassing has become a preferred solution for modern aluminum foundries because it produces fine bubbles and provides more consistent hydrogen removal.<\/p>\n<p data-start=\"8649\" data-end=\"8910\">However, degassing should be considered part of a complete molten metal purification process. Combining degassing with proper filtration technology provides better control of hydrogen, inclusions, and final casting quality.<\/p>\n<p data-start=\"8912\" data-end=\"9050\" data-is-last-node=\"\" data-is-only-node=\"\">For high-quality aluminum products, the objective is not simply removing gas, but achieving a stable, clean melt condition before casting.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"attachment_9605\" style=\"width: 942px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-9605\" class=\" wp-image-9605\" src=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-slab.jpeg\" alt=\"aluminum slab\" width=\"932\" height=\"932\" srcset=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-slab.jpeg 2048w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-slab-300x300.jpeg 300w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-slab-1024x1024.jpeg 1024w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-slab-150x150.jpeg 150w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-slab-768x768.jpeg 768w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-slab-1536x1536.jpeg 1536w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-slab-12x12.jpeg 12w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-slab-120x120.jpeg 120w\" sizes=\"auto, (max-width: 932px) 100vw, 932px\" \/><p id=\"caption-attachment-9605\" class=\"wp-caption-text\"><em>aluminum slab<\/em><\/p><\/div>\n<h2><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>FAQ<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<details>\n<summary>1. What are the main methods of degassing in foundry?<\/summary>\n<p>The main methods of degassing in foundry are <strong data-start=\"173\" data-end=\"214\">flux refining and inert gas degassing<\/strong>. Inert gas methods, including argon or nitrogen purging and rotary impeller degassing, are widely used for removing dissolved hydrogen from molten aluminum.<\/p>\n<\/details>\n<details>\n<summary>2. Why is degassing important in aluminum casting?<\/summary>\n<p>Degassing removes dissolved hydrogen from molten aluminum, reducing gas porosity, internal defects, and casting failures. It helps improve mechanical properties and casting quality.<\/p>\n<\/details>\n<details>\n<summary>3. How does inert gas degassing remove hydrogen from molten aluminum?<\/summary>\n<p>Inert gas degassing introduces argon or nitrogen bubbles into molten aluminum. Hydrogen diffuses into these bubbles because of the difference in hydrogen partial pressure, then escapes from the melt as the bubbles rise.<\/p>\n<\/details>\n<details>\n<summary>4. What gases are used for aluminum melt degassing?<\/summary>\n<p>The most commonly used gases for aluminum melt degassing are <strong data-start=\"1041\" data-end=\"1073\">argon (Ar) and nitrogen (N\u2082)<\/strong>. Argon is preferred for high-quality alloys, while nitrogen is often used for general aluminum casting applications.<\/p>\n<\/details>\n<details>\n<summary>5. What is rotary impeller degassing?<\/summary>\n<p>Rotary impeller degassing uses a rotating graphite rotor to disperse inert gas into fine bubbles throughout molten aluminum. The smaller bubbles provide greater contact area, improving hydrogen removal efficiency.<\/p>\n<\/details>\n<details>\n<summary>6. Can degassing remove oxide inclusions from molten aluminum?<\/summary>\n<p>Yes, inert gas bubbles can help remove some oxide inclusions through flotation. However, degassing mainly removes dissolved hydrogen, while ceramic filtration is required for efficient removal of solid inclusions.<\/p>\n<\/details>\n<details open=\"open\">\n<summary>7. What factors affect aluminum degassing efficiency?<\/summary>\n<p class=\"PDq2pG_selectionAnchorContainer\" data-start=\"1807\" data-end=\"1960\">The main factors affecting degassing efficiency include bubble size, gas flow rate, rotor speed, treatment time, melt temperature, and alloy composition.<\/p>\n<\/details>\n<details>\n<summary>8. Is argon better than nitrogen for aluminum degassing?<\/summary>\n<p>Argon provides excellent inert protection and is commonly used for critical aluminum alloys. Nitrogen is more economical and suitable for many general casting applications. The best choice depends on alloy requirements and quality standards.<\/p>\n<\/details>\n<details>\n<summary>9. How long does molten aluminum degassing take?<\/summary>\n<p>The degassing time depends on melt volume, hydrogen level, equipment design, and gas flow parameters. Rotary impeller systems typically achieve effective treatment within several minutes under optimized conditions.<\/p>\n<\/details>\n<details>\n<summary>10. Should aluminum degassing be combined with filtration?<\/summary>\n<p>Yes. Degassing removes dissolved hydrogen, while filtration removes solid inclusions. Combining an aluminum degassing system with ceramic filtration provides better melt cleanliness and casting performance.<\/p>\n<\/details>\n","protected":false},"excerpt":{"rendered":"<p>Methods of degassing in foundry mainly include flux refining and inert gas degassing. These processes remove dissolved hydrogen and reduce oxide inclusions in molten aluminum before casting. Among them, inert gas purging with argon or nitrogen is widely used because fine gas bubbles provide a large contact area for hydrogen diffusion and inclusion flotation, improving [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2820,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[35,7005,2502,2506,7008,2507,2505,7007,7006,2510,1225,2508,2509,2503,68,2504,1226],"class_list":["post-2804","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-degassing-aluminum-casting","tag-degassing-aluminum-with-nitrogen","tag-degassing-in-casting","tag-degassing-molten-aluminum","tag-degassing-molten-aluminum-with-nitrogen","tag-degassing-of-aluminium-alloys","tag-degassing-process-in-aluminium","tag-degassing-solutions-with-nitrogen","tag-degassing-with-liquid-nitrogen","tag-how-to-degas-aluminum","tag-in-line-degasser","tag-methods-of-degassing-in-foundry","tag-mobile-degassing-unit","tag-nitrogen-degassing-aluminum","tag-rotary-degasser","tag-rotary-degassing-aluminum","tag-rotary-degassing-unit"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Methods Of Degassing In Foundry | Degassing With Nitrogen<\/title>\n<meta name=\"description\" content=\"Methods Of Degassing In Foundry main include flux refining and degassing with inert gas. 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