{"id":3303,"date":"2020-10-13T03:37:51","date_gmt":"2020-10-13T03:37:51","guid":{"rendered":"https:\/\/www.aluminiumceramicfiber.com\/?p=3303"},"modified":"2026-05-18T06:28:37","modified_gmt":"2026-05-18T06:28:37","slug":"degassing-in-casting","status":"publish","type":"post","link":"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/","title":{"rendered":"\u0625\u0632\u0627\u0644\u0629 \u0627\u0644\u063a\u0627\u0632\u0627\u062a \u0645\u0646 \u0627\u0644\u0623\u0644\u0648\u0645\u0646\u064a\u0648\u0645: \u0627\u0644\u062f\u0644\u064a\u0644 \u0627\u0644\u0634\u0627\u0645\u0644 \u0644\u0625\u0632\u0627\u0644\u0629 \u0627\u0644\u0647\u064a\u062f\u0631\u0648\u062c\u064a\u0646 \u0645\u0646 \u0627\u0644\u0623\u0644\u0648\u0645\u0646\u064a\u0648\u0645 \u0627\u0644\u0645\u0646\u0635\u0647\u0631"},"content":{"rendered":"<p>Hydrogen in molten aluminum is one of the leading causes of porosity, pinholes, blistering, and casting defects in aluminum products.<\/p>\n<p>Proper aluminum degassing removes dissolved hydrogen before solidification, improving mechanical properties, surface quality, machinability, anodizing performance, and downstream processing reliability.<\/p>\n<p>Modern aluminum casthouses rely on rotary degassing systems, ceramic foam filtration, and controlled molten metal transfer to produce clean aluminum for extrusion billet, slab casting, wheel manufacturing, aerospace components, and foundry applications.<\/p>\n<div id=\"attachment_9456\" style=\"width: 1318px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-9456\" class=\"wp-image-9456\" src=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/10\/6583_Btf67tvT-scaled.webp\" alt=\"the importance of degassing\" width=\"1308\" height=\"713\" srcset=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/10\/6583_Btf67tvT-scaled.webp 2560w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/10\/6583_Btf67tvT-300x164.webp 300w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/10\/6583_Btf67tvT-1024x559.webp 1024w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/10\/6583_Btf67tvT-768x419.webp 768w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/10\/6583_Btf67tvT-1536x838.webp 1536w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/10\/6583_Btf67tvT-2048x1117.webp 2048w\" sizes=\"auto, (max-width: 1308px) 100vw, 1308px\" \/><p id=\"caption-attachment-9456\" class=\"wp-caption-text\"><em>the importance of degassing<\/em><\/p><\/div>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_83 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\">\u062c\u062f\u0648\u0644 \u0627\u0644\u0645\u062d\u062a\u0648\u064a\u0627\u062a<\/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;\">\u062a\u0628\u062f\u064a\u0644<\/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' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#What_Is_Aluminum_Degassing\" >What Is Aluminum Degassing?<\/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\/degassing-in-casting\/#Request_A_Quote\" >\u0627\u0637\u0644\u0628 \u0639\u0631\u0636 \u0623\u0633\u0639\u0627\u0631<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Why_Hydrogen_Is_Dangerous_in_Molten_Aluminum\" >Why Hydrogen Is Dangerous in 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-4\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Common_Defects_Caused_by_Hydrogen\" >Common Defects Caused by Hydrogen<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Where_Hydrogen_Comes_From_in_Aluminum_Casting\" >Where Hydrogen Comes From in Aluminum Casting<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#How_Rotary_Aluminum_Degassing_Works\" >How Rotary Aluminum Degassing Works<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Rotary_Degassing_Principle\" >Rotary Degassing Principle<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Benefits_of_Rotary_Aluminum_Degassing\" >Benefits of Rotary 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-9\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Online_Degassing_vs_Batch_Degassing\" >Online Degassing vs Batch Degassing<\/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\/degassing-in-casting\/#Online_Aluminum_Degassing\" >Online Aluminum Degassing<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Advantages_of_Online_Degassing\" >Advantages of Online Degassing<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Batch_Degassing\" >Batch Degassing<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Typical_Batch_Degassing_Challenges\" >Typical Batch Degassing Challenges<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Critical_Parameters_Affecting_Aluminum_Degassing_Efficiency\" >Critical Parameters Affecting Aluminum Degassing Efficiency<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Rotor_Speed\" >Rotor Speed<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Gas_Flow_Rate\" >Gas Flow Rate<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Recommended_Aluminum_Degassing_Parameters\" >Recommended Aluminum Degassing Parameters<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Request_A_Quote-2\" >\u0627\u0637\u0644\u0628 \u0639\u0631\u0636 \u0623\u0633\u0639\u0627\u0631<\/a><\/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\/degassing-in-casting\/#Aluminum_Degassing_Equipment_Selection_Guide\" >Aluminum Degassing Equipment Selection Guide<\/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\/degassing-in-casting\/#Rotor_and_Shaft_Material\" >Rotor and Shaft Material<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Graphite_Rotors\" >Graphite Rotors<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Silicon_Nitride_Si%E2%82%83N%E2%82%84_Rotors\" >Silicon Nitride (Si\u2083N\u2084) Rotors<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Degassing_Box_Design\" >Degassing Box Design<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Heating_System\" >Heating System<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Sealing_Performance\" >Sealing Performance<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Complete_Aluminum_Melt_Treatment_Process\" >Complete Aluminum Melt Treatment Process<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Furnace\" >Furnace<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Launder_System\" >\u0646\u0638\u0627\u0645 \u0627\u0644\u063a\u0633\u064a\u0644<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Aluminum_Degassing_Unit\" >Aluminum Degassing Unit<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Ceramic_Foam_Filter\" >\u0645\u0631\u0634\u062d \u0631\u063a\u0648\u064a \u062e\u0632\u0641\u064a<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Casting_Machine\" >Casting Machine<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#AdTech_Case_Study_Improving_Billet_Quality_with_Inline_Aluminum_Degassing\" >AdTech\u00a0Case Study: Improving Billet Quality with Inline 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-33\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Initial_Problems\" >Initial Problems<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Installed_Solution\" >Installed Solution<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-35\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Results_After_Aluminum_Degassing_Optimization\" >Results After Aluminum Degassing Optimization<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-36\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Best_Practices_for_Aluminum_Degassing\" >Best Practices for Aluminum Degassing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-37\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#Improve_Casting_Quality_with_Advanced_Aluminum_Degassing_Systems\" >Improve Casting Quality with Advanced Aluminum Degassing Systems<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-38\" href=\"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-in-casting\/#FAQ\" >\u0627\u0644\u0623\u0633\u0626\u0644\u0629 \u0627\u0644\u0634\u0627\u0626\u0639\u0629<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_Is_Aluminum_Degassing\"><\/span>What Is Aluminum Degassing?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Aluminum degassing is the process of removing dissolved hydrogen from molten aluminum before casting.<\/p>\n<p>Because liquid aluminum can dissolve significantly more hydrogen than solid aluminum, excess hydrogen becomes trapped during solidification and forms internal gas porosity.<\/p>\n<p>Aluminum degassing systems use inert gases such as argon or nitrogen to extract dissolved hydrogen from the melt. Modern systems typically use rotary impeller degassing technology to generate fine gas bubbles that absorb hydrogen and carry it to the melt surface.<\/p>\n<p>In addition to hydrogen removal, aluminum degassing also helps:<\/p>\n<ul data-spread=\"false\">\n<li>Reduce gas porosity<\/li>\n<li>Improve casting density<\/li>\n<li>Minimize blistering during anodizing<\/li>\n<li>Improve mechanical properties<\/li>\n<li>Reduce reject rates<\/li>\n<li>Remove some oxide inclusions through flotation<\/li>\n<li>\u062a\u062d\u0633\u064a\u0646 \u0623\u062f\u0627\u0621 \u0639\u0645\u0644\u064a\u0627\u062a \u0627\u0644\u062f\u0631\u0641\u0644\u0629 \u0648\u0627\u0644\u0628\u062b\u0642 \u0641\u064a \u0627\u0644\u0645\u0631\u0627\u062d\u0644 \u0627\u0644\u0646\u0647\u0627\u0626\u064a\u0629<\/li>\n<\/ul>\n<p>For high-quality aluminum production, degassing is usually combined with ceramic foam filtration and controlled molten metal transfer.<\/p>\n<div id=\"attachment_7520\" style=\"width: 510px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-7520\" class=\"size-full wp-image-7520\" src=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2021\/11\/Online-Degassing-Purification.jpg\" alt=\"Online Degassing Purification\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2021\/11\/Online-Degassing-Purification.jpg 500w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2021\/11\/Online-Degassing-Purification-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><p id=\"caption-attachment-7520\" class=\"wp-caption-text\"><em>Online Degassing Purification<\/em><\/p><\/div>\n<h2 style=\"text-align: center;\"><span class=\"ez-toc-section\" id=\"Request_A_Quote\"><\/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=\">\u0627\u0637\u0644\u0628 \u0639\u0631\u0636 \u0623\u0633\u0639\u0627\u0631<\/a><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h2><span class=\"ez-toc-section\" id=\"Why_Hydrogen_Is_Dangerous_in_Molten_Aluminum\"><\/span>Why Hydrogen Is Dangerous in Molten Aluminum<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Hydrogen is the only gas with significant solubility in molten aluminum.<\/p>\n<p>At approximately 720\u00b0C, liquid aluminum can dissolve around 0.77 ml H\u2082\/100g aluminum. However, during solidification, hydrogen solubility drops dramatically to roughly 0.036 ml\/100g.<\/p>\n<p>This sharp reduction forces excess hydrogen out of solution.<\/p>\n<p>The trapped gas forms:<\/p>\n<ul data-spread=\"false\">\n<li>\u0627\u0644\u0645\u0633\u0627\u0645\u064a\u0629<\/li>\n<li>\u0627\u0644\u062b\u0642\u0648\u0628 \u0627\u0644\u062f\u0642\u064a\u0642\u0629<\/li>\n<li>Internal voids<\/li>\n<li>Surface blistering<\/li>\n<li>Reduced density<\/li>\n<li>Pressure leakage defects<\/li>\n<li>Mechanical weakness<\/li>\n<\/ul>\n<p>These defects are especially critical in:<\/p>\n<ul data-spread=\"false\">\n<li>Automotive wheel casting<\/li>\n<li>Aerospace aluminum components<\/li>\n<li>Extrusion billet production<\/li>\n<li>Can stock rolling<\/li>\n<li>Heat-treated aluminum alloys<\/li>\n<li>Hydraulic castings<\/li>\n<\/ul>\n<div id=\"attachment_9455\" style=\"width: 1083px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-9455\" class=\"wp-image-9455\" src=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/10\/5796_w4tYEYpc.webp\" alt=\"Why Hydrogen Is Dangerous in Molten Aluminum\" width=\"1073\" height=\"585\" srcset=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/10\/5796_w4tYEYpc.webp 1408w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/10\/5796_w4tYEYpc-300x164.webp 300w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/10\/5796_w4tYEYpc-1024x559.webp 1024w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/10\/5796_w4tYEYpc-768x419.webp 768w\" sizes=\"auto, (max-width: 1073px) 100vw, 1073px\" \/><p id=\"caption-attachment-9455\" class=\"wp-caption-text\"><em>Why Hydrogen Is Dangerous in Molten Aluminum<\/em><\/p><\/div>\n<h3><span class=\"ez-toc-section\" id=\"Common_Defects_Caused_by_Hydrogen\"><\/span>Common Defects Caused by Hydrogen<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<table>\n<tbody>\n<tr>\n<th>Defect Type<\/th>\n<th>Typical Cause<\/th>\n<th>\u0627\u0644\u062a\u0623\u062b\u064a\u0631 \u0639\u0644\u0649 \u0627\u0644\u0625\u0646\u062a\u0627\u062c<\/th>\n<\/tr>\n<tr>\n<td>\u0645\u0633\u0627\u0645\u064a\u0629 \u0627\u0644\u063a\u0627\u0632<\/td>\n<td>Excess dissolved hydrogen<\/td>\n<td>Reduced strength and density<\/td>\n<\/tr>\n<tr>\n<td>\u0627\u0644\u062b\u0642\u0648\u0628 \u0627\u0644\u062f\u0642\u064a\u0642\u0629<\/td>\n<td>Hydrogen precipitation during solidification<\/td>\n<td>Poor surface quality<\/td>\n<\/tr>\n<tr>\n<td>Blistering<\/td>\n<td>Trapped hydrogen expands during heat treatment<\/td>\n<td>Anodizing rejection<\/td>\n<\/tr>\n<tr>\n<td>Leakage<\/td>\n<td>Internal pores connect under pressure<\/td>\n<td>Failed pressure tests<\/td>\n<\/tr>\n<tr>\n<td>Reduced fatigue life<\/td>\n<td>Internal voids initiate cracks<\/td>\n<td>Premature failure<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Without proper aluminum degassing, even well-controlled casting processes can produce unacceptable quality.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Where_Hydrogen_Comes_From_in_Aluminum_Casting\"><\/span>Where Hydrogen Comes From in Aluminum Casting<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Hydrogen pickup occurs continuously during molten aluminum handling.<\/p>\n<p>Even well-operated furnaces absorb hydrogen from moisture exposure.<\/p>\n<p>The primary hydrogen sources in aluminum casting operations include:<\/p>\n<table>\n<tbody>\n<tr>\n<td>Source<\/td>\n<td>Mechanism<\/td>\n<td>Relative Contribution<\/td>\n<td>Mitigation Strategy<\/td>\n<\/tr>\n<tr>\n<td>Atmospheric moisture<\/td>\n<td>H\u2082O reacts with molten aluminum surface<\/td>\n<td>\u0645\u0631\u062a\u0641\u0639<\/td>\n<td>Minimize exposed melt surface<\/td>\n<\/tr>\n<tr>\n<td>Wet scrap charge<\/td>\n<td>Moisture decomposes on contact<\/td>\n<td>\u0645\u0631\u062a\u0641\u0639<\/td>\n<td>Preheat and dry scrap<\/td>\n<\/tr>\n<tr>\n<td>Furnace combustion gases<\/td>\n<td>Water vapor contacts melt<\/td>\n<td>\u0645\u062a\u0648\u0633\u0637<\/td>\n<td>Reduce direct flame exposure<\/td>\n<\/tr>\n<tr>\n<td>Refractory moisture<\/td>\n<td>Furnace lining releases water vapor<\/td>\n<td>\u0645\u062a\u0648\u0633\u0637<\/td>\n<td>Complete dry-out cycle<\/td>\n<\/tr>\n<tr>\n<td>Ladles and tools<\/td>\n<td>Cold surfaces introduce moisture<\/td>\n<td>\u0645\u062a\u0648\u0633\u0637<\/td>\n<td>Preheat tools and launders<\/td>\n<\/tr>\n<tr>\n<td>Fluxes and additives<\/td>\n<td>Hygroscopic materials absorb water<\/td>\n<td>\u0645\u0646\u062e\u0641\u0636<\/td>\n<td>Controlled storage<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Experienced casthouse operators understand that aluminum degassing equipment removes hydrogen already dissolved in the melt \u2014 but upstream melt practice determines how difficult the degassing task becomes.<\/p>\n<p>For example:<\/p>\n<ul data-spread=\"false\">\n<li>A clean operation may deliver molten aluminum to the degassing station at 0.18 ml\/100g hydrogen<\/li>\n<li>A poorly controlled operation may exceed 0.40 ml\/100g<\/li>\n<\/ul>\n<p>The higher the inlet hydrogen level, the more difficult it becomes to achieve low final hydrogen content.<\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/web.whatsapp.com\/send?phone=8617344611163&amp;text=\" target=\"_blank\" rel=\"noopener\"><em><strong><span class=\"su-highlight\" style=\"background:&#8221;#ffffff&#8221;;color:&#8221;#e76d6d&#8221;Looking\">&nbsp;<\/strong><\/em><\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_Rotary_Aluminum_Degassing_Works\"><\/span>How Rotary Aluminum Degassing Works<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Modern aluminum degassing systems primarily use rotary impeller technology.<\/p>\n<p>The process combines inert gas injection with controlled rotor rotation to maximize hydrogen transfer efficiency.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Rotary_Degassing_Principle\"><\/span>Rotary Degassing Principle<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A hollow graphite or ceramic shaft delivers inert gas into molten aluminum.<\/p>\n<p>A submerged rotor spins at controlled speed and breaks the gas stream into thousands of micro-bubbles.<\/p>\n<p>These bubbles provide a large gas-liquid contact surface area.<\/p>\n<p>Because fresh argon or nitrogen bubbles contain almost no hydrogen, dissolved hydrogen in the surrounding molten aluminum diffuses rapidly into the bubbles.<\/p>\n<p>The bubbles rise to the surface and release hydrogen into the atmosphere.<\/p>\n<p>At the same time:<\/p>\n<ul data-spread=\"false\">\n<li>Oxide inclusions attach to rising bubbles<\/li>\n<li>Inclusions float upward and enter the dross layer<\/li>\n<li>Some alkali metals can be removed using chlorine-containing gas mixtures<\/li>\n<\/ul>\n<p>This combination of hydrogen removal and inclusion flotation makes rotary aluminum degassing highly effective for industrial casting operations.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Benefits_of_Rotary_Aluminum_Degassing\"><\/span>Benefits of Rotary Aluminum Degassing<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Rotary degassing systems provide:<\/p>\n<ul data-spread=\"false\">\n<li>Stable hydrogen removal efficiency<\/li>\n<li>Continuous inline operation<\/li>\n<li>Low operating cost<\/li>\n<li>Compatibility with automated casting lines<\/li>\n<li>Improved metal cleanliness<\/li>\n<li>Reduced reject rates<\/li>\n<li>Better process consistency<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Online_Degassing_vs_Batch_Degassing\"><\/span>Online Degassing vs Batch Degassing<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The two primary aluminum degassing approaches are inline degassing and batch degassing.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Online_Aluminum_Degassing\"><\/span>Online Aluminum Degassing<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Online degassing systems are installed between the furnace and the casting machine.<\/p>\n<p>Molten aluminum flows continuously through the treatment chamber before entering filtration and casting.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Advantages_of_Online_Degassing\"><\/span>Advantages of Online Degassing<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul data-spread=\"false\">\n<li>Consistent treatment quality<\/li>\n<li>Minimal hydrogen reabsorption<\/li>\n<li>Continuous production capability<\/li>\n<li>Better automation integration<\/li>\n<li>Improved process repeatability<\/li>\n<li>Lower defect variation<\/li>\n<\/ul>\n<p>Online systems are widely used in:<\/p>\n<ul data-spread=\"false\">\n<li>DC casting<\/li>\n<li>\u0635\u0628 \u0627\u0644\u0642\u0636\u0628\u0627\u0646<\/li>\n<li>\u0635\u0628 \u0627\u0644\u0623\u0644\u0648\u0627\u062d<\/li>\n<li>Automotive casting<\/li>\n<li>Continuous foundry operations<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Batch_Degassing\"><\/span>Batch Degassing<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Batch degassing treats a discrete ladle or crucible of molten aluminum.<\/p>\n<p>The treatment itself may be effective, but the metal can reabsorb hydrogen during transport and pouring.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Typical_Batch_Degassing_Challenges\"><\/span>Typical Batch Degassing Challenges<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<ul data-spread=\"false\">\n<li>Re-gassing during transfer<\/li>\n<li>\u0627\u0644\u0627\u0636\u0637\u0631\u0627\u0628\u0627\u062a \u0627\u0644\u0633\u0637\u062d\u064a\u0629<\/li>\n<li>Variable treatment quality<\/li>\n<li>Increased operator dependence<\/li>\n<li>Longer exposure to atmosphere<\/li>\n<\/ul>\n<p>Field measurements frequently show hydrogen increasing again after ladle transport.<\/p>\n<p>For small foundries, batch degassing may still be economically practical. However, for medium and large-scale production, inline aluminum degassing generally delivers superior consistency.<\/p>\n<div class=\"mceTemp\"><\/div>\n<p>&nbsp;<\/p>\n<div id=\"attachment_8492\" style=\"width: 885px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-8492\" class=\"wp-image-8492\" src=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2022\/01\/Online-Metal-Degassing-Systems.jpg\" alt=\"Online aluminum Degassing Systems\" width=\"875\" height=\"583\" srcset=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2022\/01\/Online-Metal-Degassing-Systems.jpg 600w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2022\/01\/Online-Metal-Degassing-Systems-300x200.jpg 300w\" sizes=\"auto, (max-width: 875px) 100vw, 875px\" \/><p id=\"caption-attachment-8492\" class=\"wp-caption-text\"><em>Online aluminum Degassing Systems<\/em><\/p><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Critical_Parameters_Affecting_Aluminum_Degassing_Efficiency\"><\/span>Critical Parameters Affecting Aluminum Degassing Efficiency<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Aluminum degassing performance depends heavily on process control.<\/p>\n<p>Simply injecting gas into molten aluminum is not enough.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Rotor_Speed\"><\/span>Rotor Speed<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Rotor speed directly affects bubble formation.<\/p>\n<p>Higher rotor speeds create smaller bubbles with greater surface area, improving hydrogen transfer.<\/p>\n<p>However, excessive speed creates vortex formation.<\/p>\n<p>A vortex pulls surface oxides back into the melt and increases turbulence.<\/p>\n<p>In practice, most inline aluminum degassing systems operate between:<\/p>\n<ul data-spread=\"false\">\n<li>450\u2013550 RPM for wrought alloys<\/li>\n<li>400\u2013500 RPM for foundry alloys<\/li>\n<\/ul>\n<p>The optimal value depends on:<\/p>\n<ul data-spread=\"false\">\n<li>Alloy type<\/li>\n<li>Throughput<\/li>\n<li>Degassing chamber geometry<\/li>\n<li>Rotor design<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Gas_Flow_Rate\"><\/span>Gas Flow Rate<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Gas flow must also remain within an optimal range.<\/p>\n<p>Too little gas:<\/p>\n<ul data-spread=\"false\">\n<li>Insufficient hydrogen removal<\/li>\n<li>Poor bubble distribution<\/li>\n<\/ul>\n<p>Too much gas:<\/p>\n<ul data-spread=\"false\">\n<li>Bubble coalescence<\/li>\n<li>Surface splashing<\/li>\n<li>Oxide generation<\/li>\n<li>Reduced efficiency<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Recommended_Aluminum_Degassing_Parameters\"><\/span>Recommended Aluminum Degassing Parameters<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<table>\n<tbody>\n<tr>\n<td>Alloy Group<\/td>\n<td>Gas Type<\/td>\n<td>Flow Rate (L\/min)<\/td>\n<td>\u0633\u0631\u0639\u0629 \u0627\u0644\u062f\u0648\u0627\u0631 (\u062f\u0648\u0631\u0629 \u0641\u064a \u0627\u0644\u062f\u0642\u064a\u0642\u0629)<\/td>\n<td>Target H\u2082 Output<\/td>\n<\/tr>\n<tr>\n<td>1xxx \/ 3xxx alloys<\/td>\n<td>Nitrogen or Argon<\/td>\n<td>10\u201315<\/td>\n<td>450\u2013500<\/td>\n<td>&lt;0.10 ml\/100g<\/td>\n<\/tr>\n<tr>\n<td>6xxx extrusion alloys<\/td>\n<td>Nitrogen or Ar\/N\u2082<\/td>\n<td>12\u201318<\/td>\n<td>450\u2013520<\/td>\n<td>&lt;0.12 ml\/100g<\/td>\n<\/tr>\n<tr>\n<td>High-Mg alloys<\/td>\n<td>\u0627\u0644\u0623\u0631\u062c\u0648\u0646<\/td>\n<td>15\u201322<\/td>\n<td>480\u2013550<\/td>\n<td>&lt;0.10 ml\/100g<\/td>\n<\/tr>\n<tr>\n<td>Al-Si foundry alloys<\/td>\n<td>Nitrogen or Argon<\/td>\n<td>10\u201316<\/td>\n<td>400\u2013480<\/td>\n<td>&lt;0.15 ml\/100g<\/td>\n<\/tr>\n<tr>\n<td>Aerospace alloys<\/td>\n<td>\u0627\u0644\u0623\u0631\u062c\u0648\u0646<\/td>\n<td>15\u201325<\/td>\n<td>480\u2013550<\/td>\n<td>&lt;0.08 ml\/100g<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>High-magnesium alloys generally require argon because nitrogen may react with magnesium and form Mg\u2083N\u2082.<\/p>\n<h2 style=\"text-align: center;\"><span class=\"ez-toc-section\" id=\"Request_A_Quote-2\"><\/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=\">\u0627\u0637\u0644\u0628 \u0639\u0631\u0636 \u0623\u0633\u0639\u0627\u0631<\/a><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h2><span class=\"ez-toc-section\" id=\"Aluminum_Degassing_Equipment_Selection_Guide\"><\/span>Aluminum Degassing Equipment Selection Guide<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Choosing the right aluminum degassing system requires more than simply comparing throughput ratings.<\/p>\n<p>Equipment design strongly influences:<\/p>\n<ul data-spread=\"false\">\n<li>Hydrogen removal efficiency<\/li>\n<li>Maintenance frequency<\/li>\n<li>Operating cost<\/li>\n<li>\u0627\u0633\u062a\u0642\u0631\u0627\u0631 \u0627\u0644\u0639\u0645\u0644\u064a\u0629<\/li>\n<li>\u0646\u0638\u0627\u0641\u0629 \u0627\u0644\u0645\u0639\u0627\u062f\u0646<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Rotor_and_Shaft_Material\"><\/span>Rotor and Shaft Material<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Rotor material is one of the most critical design decisions.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Graphite_Rotors\"><\/span>Graphite Rotors<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>Traditional graphite rotors are widely used but suffer from:<\/p>\n<ul data-spread=\"false\">\n<li>\u0627\u0644\u0623\u0643\u0633\u062f\u0629<\/li>\n<li>Abrasion<\/li>\n<li>Magnesium attack<\/li>\n<li>Thermal shock damage<\/li>\n<\/ul>\n<p>Typical service life may range from several weeks to a few months depending on alloy conditions.<\/p>\n<h4><span class=\"ez-toc-section\" id=\"Silicon_Nitride_Si%E2%82%83N%E2%82%84_Rotors\"><\/span>Silicon Nitride (Si\u2083N\u2084) Rotors<span class=\"ez-toc-section-end\"><\/span><\/h4>\n<p>Advanced ceramic rotors offer significantly longer service life.<\/p>\n<p>\u062a\u0634\u0645\u0644 \u0627\u0644\u0645\u0632\u0627\u064a\u0627 \u0645\u0627 \u064a\u0644\u064a:<\/p>\n<ul data-spread=\"false\">\n<li>Excellent oxidation resistance<\/li>\n<li>Reduced wear<\/li>\n<li>Improved dimensional stability<\/li>\n<li>Longer maintenance intervals<\/li>\n<li>Better bubble generation consistency<\/li>\n<\/ul>\n<p>In many industrial applications, Si\u2083N\u2084 rotors achieve multi-year service life.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Degassing_Box_Design\"><\/span>Degassing Box Design<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The degassing chamber must resist:<\/p>\n<ul data-spread=\"false\">\n<li>Molten aluminum attack<\/li>\n<li>Thermal cycling<\/li>\n<li>Dross buildup<\/li>\n<li>Mechanical cleaning damage<\/li>\n<\/ul>\n<p>High-quality linings improve:<\/p>\n<ul data-spread=\"false\">\n<li>\u0627\u0644\u0627\u0633\u062a\u0642\u0631\u0627\u0631 \u0627\u0644\u062d\u0631\u0627\u0631\u064a<\/li>\n<li>Non-wetting performance<\/li>\n<li>Process cleanliness<\/li>\n<li>Service life<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Heating_System\"><\/span>Heating System<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Maintaining melt temperature is essential during treatment.<\/p>\n<p>Integrated heating systems reduce:<\/p>\n<ul data-spread=\"false\">\n<li>Temperature loss<\/li>\n<li>Metal freezing risk<\/li>\n<li>Process instability<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Sealing_Performance\"><\/span>Sealing Performance<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Poor sealing allows atmospheric moisture into the treatment chamber.<\/p>\n<p>This directly reduces aluminum degassing efficiency because additional hydrogen enters the melt during treatment.<\/p>\n<h2 style=\"text-align: center;\"><iframe loading=\"lazy\" title=\"\u0645\u0634\u063a\u0644 \u0645\u0642\u0627\u0637\u0639 \u0627\u0644\u0641\u064a\u062f\u064a\u0648 \u0639\u0644\u0649 \u064a\u0648\u062a\u064a\u0648\u0628\" src=\"https:\/\/www.youtube.com\/embed\/OsSGhMaW57s?si=LBpLySqw65lJP5gM\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/h2>\n<h2><span class=\"ez-toc-section\" id=\"Complete_Aluminum_Melt_Treatment_Process\"><\/span>Complete Aluminum Melt Treatment Process<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Aluminum degassing is only one stage of the total molten metal treatment chain.<\/p>\n<p>A modern aluminum casting line typically follows this sequence:<\/p>\n<p>Melting Furnace \u2192 Holding Furnace \u2192 Launder System \u2192 Inline Aluminum Degassing \u2192 Ceramic Foam Filtration \u2192 Casting Machine<\/p>\n<p>Each stage serves a different function.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Furnace\"><\/span>Furnace<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The furnace:<\/p>\n<ul data-spread=\"false\">\n<li>Melts the alloy<\/li>\n<li>Controls composition<\/li>\n<li>Maintains target temperature<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Launder_System\"><\/span>\u0646\u0638\u0627\u0645 \u0627\u0644\u063a\u0633\u064a\u0644<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The launder transfers molten aluminum between treatment stages while minimizing:<\/p>\n<ul data-spread=\"false\">\n<li>Temperature loss<\/li>\n<li>\u0627\u0644\u0623\u0643\u0633\u062f\u0629<\/li>\n<li>\u0627\u0644\u0627\u0636\u0637\u0631\u0627\u0628<\/li>\n<li>Hydrogen pickup<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Aluminum_Degassing_Unit\"><\/span>Aluminum Degassing Unit<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The degassing station removes:<\/p>\n<ul data-spread=\"false\">\n<li>Dissolved hydrogen<\/li>\n<li>Some floating inclusions<\/li>\n<li>Certain alkali impurities<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Ceramic_Foam_Filter\"><\/span>\u0645\u0631\u0634\u062d \u0631\u063a\u0648\u064a \u062e\u0632\u0641\u064a<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Ceramic foam filters remove:<\/p>\n<ul data-spread=\"false\">\n<li>Oxide films<\/li>\n<li>Non-metallic inclusions<\/li>\n<li>Entrained particles<\/li>\n<\/ul>\n<p>Degassing alone cannot fully replace filtration.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Casting_Machine\"><\/span>Casting Machine<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The final casting stage solidifies treated molten aluminum into:<\/p>\n<ul data-spread=\"false\">\n<li>Billets<\/li>\n<li>Slabs<\/li>\n<li>Ingots<\/li>\n<li>Wheels<\/li>\n<li>Foundry castings<\/li>\n<\/ul>\n<p>The best casting quality is achieved when all treatment stages work together.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"AdTech_Case_Study_Improving_Billet_Quality_with_Inline_Aluminum_Degassing\"><\/span>AdTech\u00a0Case Study: Improving Billet Quality with Inline Aluminum Degassing<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A Turkish extrusion billet producer operating two DC casting pits struggled with excessive hydrogen levels and inconsistent billet quality.<\/p>\n<p>The plant produced 6060 and 6063 extrusion billet for domestic construction markets but needed improved quality to meet European export standards.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Initial_Problems\"><\/span>Initial Problems<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The plant experienced:<\/p>\n<ul data-spread=\"false\">\n<li>Hydrogen levels of 0.20\u20130.32 ml\/100g<\/li>\n<li>Billet surface defects<\/li>\n<li>Anodizing blistering<\/li>\n<li>High reject rates<\/li>\n<li>Inconsistent casting quality<\/li>\n<\/ul>\n<p>The root causes included:<\/p>\n<ul data-spread=\"false\">\n<li>Wet return scrap<\/li>\n<li>Poor furnace sealing<\/li>\n<li>Incomplete refractory dry-out<\/li>\n<li>No inline aluminum degassing system<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Installed_Solution\"><\/span>Installed Solution<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The melt treatment upgrade included:<\/p>\n<ul data-spread=\"false\">\n<li>Dual-rotor inline aluminum degassing systems<\/li>\n<li>Ceramic foam filtration<\/li>\n<li>Insulated launders<\/li>\n<li>Hydrogen measurement equipment<\/li>\n<li>Operator training<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Results_After_Aluminum_Degassing_Optimization\"><\/span>Results After Aluminum Degassing Optimization<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<table>\n<tbody>\n<tr>\n<td>\u0627\u0644\u0645\u0639\u0644\u0645\u0629<\/td>\n<td>Before<\/td>\n<td>After<\/td>\n<td>Improvement<\/td>\n<\/tr>\n<tr>\n<td>Hydrogen level<\/td>\n<td>0.20\u20130.32 ml\/100g<\/td>\n<td>0.08\u20130.11 ml\/100g<\/td>\n<td>60\u201365% reduction<\/td>\n<\/tr>\n<tr>\n<td>RPT density index<\/td>\n<td>8\u201314%<\/td>\n<td>1.5\u20133.0%<\/td>\n<td>&gt;75% improvement<\/td>\n<\/tr>\n<tr>\n<td>Billet surface quality<\/td>\n<td>Moderate pitting<\/td>\n<td>Smooth surface<\/td>\n<td>Significant improvement<\/td>\n<\/tr>\n<tr>\n<td>Anodizing blister rate<\/td>\n<td>6\u20139%<\/td>\n<td>&lt;0.8%<\/td>\n<td>&gt;90% reduction<\/td>\n<\/tr>\n<tr>\n<td>Export compliance<\/td>\n<td>Failed<\/td>\n<td>Passed<\/td>\n<td>Full qualification<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The customer achieved full compliance with European extrusion quality requirements and significantly reduced rejection costs.<\/p>\n<p style=\"text-align: center;\"><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=\">\u0627\u0637\u0644\u0628 \u0639\u0631\u0636 \u0623\u0633\u0639\u0627\u0631<\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Best_Practices_for_Aluminum_Degassing\"><\/span>Best Practices for Aluminum Degassing<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>High-performance aluminum degassing requires more than equipment alone.<\/p>\n<p>Best practices include:<\/p>\n<ul data-spread=\"false\">\n<li>Drying all scrap and tools before charging<\/li>\n<li>Minimizing melt turbulence<\/li>\n<li>Maintaining furnace seals<\/li>\n<li>Controlling rotor speed and gas flow<\/li>\n<li>Using proper filtration downstream<\/li>\n<li>Monitoring hydrogen levels regularly<\/li>\n<li>Preventing re-gassing during transfer<\/li>\n<li>Performing regular rotor inspection and maintenance<\/li>\n<\/ul>\n<p>Casthouses that combine good melt practice with optimized aluminum degassing systems consistently achieve superior metal quality.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Improve_Casting_Quality_with_Advanced_Aluminum_Degassing_Systems\"><\/span>Improve Casting Quality with Advanced Aluminum Degassing Systems<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Hydrogen control is one of the most important factors in producing high-quality aluminum castings.<\/p>\n<p>Modern inline aluminum degassing systems help casthouses achieve:<\/p>\n<ul data-spread=\"false\">\n<li>Lower hydrogen content<\/li>\n<li>Reduced porosity<\/li>\n<li>Better surface quality<\/li>\n<li>Improved mechanical properties<\/li>\n<li>Stable production quality<\/li>\n<li>Lower rejection rates<\/li>\n<\/ul>\n<p>AdTech provides complete molten aluminum treatment solutions including:<\/p>\n<ul data-spread=\"false\">\n<li>\u0623\u0646\u0638\u0645\u0629 \u0625\u0632\u0627\u0644\u0629 \u0627\u0644\u063a\u0627\u0632\u0627\u062a \u0645\u0646 \u0627\u0644\u0623\u0644\u0648\u0645\u0646\u064a\u0648\u0645 \u0627\u0644\u0645\u062f\u0645\u062c\u0629 \u0641\u064a \u062e\u0637 \u0627\u0644\u0625\u0646\u062a\u0627\u062c<\/li>\n<li>Ceramic foam filtration<\/li>\n<li>\u0623\u0646\u0638\u0645\u0629 \u0627\u0644\u063a\u0633\u064a\u0644<\/li>\n<li>\u0639\u0632\u0644 \u0645\u0646 \u0627\u0644\u0623\u0644\u064a\u0627\u0641 \u0627\u0644\u062e\u0632\u0641\u064a\u0629<\/li>\n<li>Hydrogen measurement support<\/li>\n<li>Process optimization services<\/li>\n<\/ul>\n<p>Our engineering team supports extrusion billet, slab casting, foundry, wheel casting, and aerospace aluminum applications worldwide.<\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/web.whatsapp.com\/send?phone=8617344611163&amp;text=\" target=\"_blank\" rel=\"noopener\"><em><strong><span class=\"su-highlight\" style=\"background:#ffffff;color:#e76d6d\">&nbsp;&nbsp;<\/span>Contact AdTech for aluminum degassing system recommendations, hydrogen control optimization, and complete molten aluminum treatment solutions.&nbsp;<\/span><\/strong><\/em><\/a><\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQ\"><\/span>\u0627\u0644\u0623\u0633\u0626\u0644\u0629 \u0627\u0644\u0634\u0627\u0626\u0639\u0629<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<details>\n<summary>1. What is aluminum degassing?<\/summary>\n<p>Aluminum degassing is the process of removing dissolved hydrogen from molten aluminum before casting. Proper degassing helps reduce porosity, improve casting density, and enhance overall aluminum product quality.<\/p>\n<\/details>\n<details>\n<summary>2. Why is hydrogen harmful in molten aluminum?<\/summary>\n<p>Hydrogen is the only gas with significant solubility in molten aluminum. During solidification, excess hydrogen forms gas pores inside the casting, leading to porosity, pinholes, blistering, leakage defects, and reduced mechanical strength.<\/p>\n<\/details>\n<details>\n<summary>3. How does rotary aluminum degassing work?<\/summary>\n<p>Rotary aluminum degassing uses a rotating rotor to inject inert gas into molten aluminum. The rotor breaks the gas into fine bubbles that absorb dissolved hydrogen and float some oxide inclusions to the melt surface.<\/p>\n<\/details>\n<details>\n<summary>4. What gas is used for aluminum degassing?<\/summary>\n<p>Argon and nitrogen are the most common gases used for aluminum degassing. Argon is preferred for high-magnesium alloys, while nitrogen is widely used for standard extrusion and foundry alloys due to lower operating cost.<\/p>\n<\/details>\n<details>\n<summary>5. What is the difference between inline and batch degassing?<\/summary>\n<p>Online degassing continuously treats molten aluminum as it flows to the casting machine, providing more stable quality and less hydrogen reabsorption. Batch degassing treats molten aluminum in a ladle or crucible and may allow re-gassing during transfer.<\/p>\n<\/details>\n<details>\n<summary>6. Can aluminum degassing remove oxide inclusions?<\/summary>\n<p>Partially. Rising gas bubbles can help float some oxide inclusions to the surface, but aluminum degassing cannot fully replace filtration. Ceramic foam filters are still necessary for complete inclusion removal.<\/p>\n<\/details>\n<details>\n<summary>7. What hydrogen level is acceptable after degassing?<\/summary>\n<p>Acceptable hydrogen levels depend on the application. Standard aluminum castings may target below 0.15 ml\/100g, while high-quality extrusion billet often requires below 0.10 ml\/100g. Aerospace applications may require even lower levels.<\/p>\n<\/details>\n<details>\n<summary>8. How is hydrogen measured in molten aluminum?<\/summary>\n<p>Hydrogen in molten aluminum is commonly measured using the Reduced Pressure Test (RPT), ALSCAN, or Telegas systems. These methods help evaluate degassing efficiency and overall melt cleanliness.<\/p>\n<\/details>\n<details>\n<summary>9. Why does molten aluminum reabsorb hydrogen after degassing?<\/summary>\n<p>Molten aluminum can reabsorb hydrogen when exposed to atmospheric moisture, furnace gases, turbulence, or poorly sealed transfer systems. Proper melt handling and enclosed launders help minimize re-gassing.<\/p>\n<\/details>\n<details>\n<summary>10. How do I choose the right aluminum degassing system?<\/summary>\n<p>The correct aluminum degassing system depends on alloy type, casting throughput, hydrogen targets, and production process. Important factors include rotor design, gas type, treatment capacity, maintenance requirements, and compatibility with the full melt treatment line.<\/p>\n<\/details>","protected":false},"excerpt":{"rendered":"<p>Hydrogen in molten aluminum is one of the leading causes of porosity, pinholes, blistering, and casting defects in aluminum products. Proper aluminum degassing removes dissolved hydrogen before solidification, improving mechanical properties, surface quality, machinability, anodizing performance, and downstream processing reliability. Modern aluminum casthouses rely on rotary degassing systems, ceramic foam filtration, and controlled molten metal [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3304,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[8232,8226,8235,8220,8228,8218,8219,8234,8224,8216,8221,8233,8223,8230,8229,8222,8225,8217,8227,8231],"class_list":["post-3303","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-degassing-for-aluminium-cambodia","tag-degassing-for-aluminium-laos","tag-degassing-for-aluminum-cambodia","tag-degassing-for-aluminum-factory-in-vietnam","tag-degassing-for-aluminum-in-laos","tag-degassing-for-aluminum-vietnam","tag-degassing-for-aluminum-vietnamese","tag-degassing-for-cambodia-aluminium-company","tag-degassing-for-global-aluminum-vietnam","tag-degassing-for-goldwell-aluminium-vietnam","tag-degassing-for-hiroshima-aluminum-vietnam","tag-degassing-for-huffy-aluminium-cambodia","tag-degassing-for-hyundai-aluminum-vietnam","tag-degassing-for-laos-aluminium","tag-degassing-for-laos-aluminum","tag-degassing-for-sapa-aluminum-vietnam","tag-degassing-for-tung-shin-aluminum-vietnam","tag-degassing-for-vietnam-aluminium-association","tag-degassing-for-yunnan-aluminium-laos","tag-degassing-for-yunnan-laos-aluminium"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Aluminum Degassing Systems for Molten Aluminum Treatment | Hydrogen Removal Guide<\/title>\n<meta name=\"description\" content=\"Learn how aluminum degassing removes hydrogen from molten aluminum to prevent porosity and casting defects. 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