{"id":2747,"date":"2020-09-10T06:49:32","date_gmt":"2020-09-10T06:49:32","guid":{"rendered":"https:\/\/www.aluminiumceramicfiber.com\/?p=2747"},"modified":"2026-09-20T03:24:24","modified_gmt":"2026-09-20T03:24:24","slug":"degassing-process-in-aluminum","status":"publish","type":"post","link":"https:\/\/www.aluminiumceramicfiber.com\/ar\/degassing-process-in-aluminum\/","title":{"rendered":"\u0639\u0645\u0644\u064a\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"},"content":{"rendered":"<p>The aluminum degassing process removes dissolved hydrogen from molten aluminum before casting. Hydrogen can cause porosity and other internal defects when its solubility drops during solidification. In industrial aluminum processing, nitrogen or argon is introduced into the melt to form fine gas bubbles, providing surfaces for dissolved hydrogen to transfer into and escape.<\/p>\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\">\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-process-in-aluminum\/#How_Does_Hydrogen_Removal_Occur_in_Aluminum\" >How Does Hydrogen Removal Occur in Aluminum?<\/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-process-in-aluminum\/#How_Does_Hydrogen_Enter_the_Gas_Bubbles\" >How Does Hydrogen Enter the Gas Bubbles?<\/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-process-in-aluminum\/#Why_Do_Fine_Gas_Bubbles_Improve_Degassing\" >Why Do Fine Gas Bubbles Improve Degassing?<\/a><\/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\/degassing-process-in-aluminum\/#Why_Does_Hydrogen_Cause_Porosity_in_Aluminum\" >Why Does Hydrogen Cause Porosity in Aluminum?<\/a><\/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-process-in-aluminum\/#Degassing_vs_Filtration\" >Degassing vs. Filtration<\/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-process-in-aluminum\/#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=\"How_Does_Hydrogen_Removal_Occur_in_Aluminum\"><\/span>How Does Hydrogen Removal Occur in Aluminum?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Hydrogen removal can be understood through three basic stages:<\/p>\n<ol>\n<li><strong>Bubble formation<\/strong><\/li>\n<li><strong>Hydrogen transfer and bubble growth<\/strong><\/li>\n<li><strong>Bubble flotation and escape<\/strong><\/li>\n<\/ol>\n<p>When the hydrogen concentration in molten aluminum is high enough, hydrogen bubbles can nucleate if the pressure inside the bubble can overcome the surrounding pressure.<\/p>\n<p>However, as the hydrogen content decreases, spontaneous bubble nucleation becomes increasingly difficult. Industrial degassing therefore introduces externally generated nitrogen or argon bubbles into the melt to provide a controlled gas-liquid interface for hydrogen removal.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_Does_Hydrogen_Enter_the_Gas_Bubbles\"><\/span>How Does Hydrogen Enter the Gas Bubbles?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>During rotary degassing, nitrogen or argon is dispersed into molten aluminum through a rotating rotor. The process can be simplified as follows:<\/p>\n<p><strong>Dissolved hydrogen \u2192 diffusion to bubble surface \u2192 transfer into gas bubble \u2192 bubble rises \u2192 gas escapes<\/strong><\/p>\n<p>Hydrogen moves from the molten aluminum toward the gas-liquid interface through convection and diffusion. It then transfers into the inert-gas bubble. As the bubble rises, hydrogen continues to enter the bubble, while the surrounding pressure gradually decreases.<\/p>\n<p>When the hydrogen-rich bubble reaches the melt surface, the gas escapes from the aluminum.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Why_Do_Fine_Gas_Bubbles_Improve_Degassing\"><\/span>Why Do Fine Gas Bubbles Improve Degassing?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Fine bubbles provide a larger total gas-liquid interfacial area than large bubbles for the same amount of injected gas. This increases the available area for hydrogen transfer.<\/p>\n<p>However, bubble size is only one factor affecting degassing performance. Gas flow rate, rotor speed, rotor design, melt temperature, treatment time, melt depth, and hydrogen concentration all influence the final hydrogen level.<\/p>\n<table>\n<thead>\n<tr>\n<th>\u0627\u0644\u0639\u0627\u0645\u0644<\/th>\n<th>Effect on Degassing<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u062d\u062c\u0645 \u0627\u0644\u0641\u0642\u0627\u0639\u0629<\/td>\n<td>Affects gas-liquid surface area<\/td>\n<\/tr>\n<tr>\n<td>\u0645\u0639\u062f\u0644 \u062a\u062f\u0641\u0642 \u0627\u0644\u063a\u0627\u0632<\/td>\n<td>Affects bubble dispersion<\/td>\n<\/tr>\n<tr>\n<td>\u0633\u0631\u0639\u0629 \u0627\u0644\u062f\u0648\u0627\u0631<\/td>\n<td>Affects mixing and bubble breakup<\/td>\n<\/tr>\n<tr>\n<td>Melt temperature<\/td>\n<td>Affects hydrogen solubility<\/td>\n<\/tr>\n<tr>\n<td>\u0645\u062f\u0629 \u0627\u0644\u0639\u0644\u0627\u062c<\/td>\n<td>Affects hydrogen removal<\/td>\n<\/tr>\n<tr>\n<td>Initial hydrogen level<\/td>\n<td>Determines the required treatment intensity<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span class=\"ez-toc-section\" id=\"Why_Does_Hydrogen_Cause_Porosity_in_Aluminum\"><\/span>Why Does Hydrogen Cause Porosity in Aluminum?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div id=\"attachment_9672\" style=\"width: 824px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-9672\" class=\"wp-image-9672\" src=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-casting-defects.webp\" alt=\"aluminum casting defects\" width=\"814\" height=\"482\" srcset=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-casting-defects.webp 986w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-casting-defects-300x178.webp 300w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-casting-defects-768x455.webp 768w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/aluminum-casting-defects-18x12.webp 18w\" sizes=\"auto, (max-width: 814px) 100vw, 814px\" \/><p id=\"caption-attachment-9672\" class=\"wp-caption-text\"><em>aluminum casting defects<\/em><\/p><\/div>\n<p>Hydrogen is much more soluble in liquid aluminum than in solid aluminum. During solidification, hydrogen solubility decreases significantly. Excess hydrogen can therefore form pores inside the casting.<\/p>\n<p>This is why hydrogen control is an important part of molten aluminum treatment before casting.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Degassing_vs_Filtration\"><\/span>Degassing vs. Filtration<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div id=\"attachment_9604\" style=\"width: 653px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-9604\" class=\"wp-image-9604\" src=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/7112_HU2XLKyX.webp\" alt=\"\u0645\u0639\u062f\u0627\u062a \u0625\u0632\u0627\u0644\u0629 \u0627\u0644\u063a\u0627\u0632 \u0639\u0628\u0631 \u0627\u0644\u0625\u0646\u062a\u0631\u0646\u062a\" width=\"643\" height=\"481\" 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: 643px) 100vw, 643px\" \/><p id=\"caption-attachment-9604\" class=\"wp-caption-text\"><em>\u0645\u0639\u062f\u0627\u062a \u0625\u0632\u0627\u0644\u0629 \u0627\u0644\u063a\u0627\u0632 \u0639\u0628\u0631 \u0627\u0644\u0625\u0646\u062a\u0631\u0646\u062a<\/em><\/p><\/div>\n<div id=\"attachment_9674\" style=\"width: 655px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-9674\" class=\"wp-image-9674\" src=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/ceramic-foam-filter\u4e3b\u56fe.webp\" alt=\"ceramic foam filter for filtration\" width=\"645\" height=\"645\" srcset=\"https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/ceramic-foam-filter\u4e3b\u56fe.webp 1254w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/ceramic-foam-filter\u4e3b\u56fe-300x300.webp 300w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/ceramic-foam-filter\u4e3b\u56fe-1024x1024.webp 1024w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/ceramic-foam-filter\u4e3b\u56fe-150x150.webp 150w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/ceramic-foam-filter\u4e3b\u56fe-768x768.webp 768w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/ceramic-foam-filter\u4e3b\u56fe-12x12.webp 12w, https:\/\/www.aluminiumceramicfiber.com\/wp-content\/uploads\/2020\/09\/ceramic-foam-filter\u4e3b\u56fe-120x120.webp 120w\" sizes=\"auto, (max-width: 645px) 100vw, 645px\" \/><p id=\"caption-attachment-9674\" class=\"wp-caption-text\"><em>ceramic foam filter for filtration<\/em><\/p><\/div>\n<p>Degassing and filtration solve different melt-quality problems.<\/p>\n<table>\n<thead>\n<tr>\n<th>\u0627\u0644\u0639\u0645\u0644\u064a\u0629<\/th>\n<th>Main Purpose<\/th>\n<th>Typical Method<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u0625\u0632\u0627\u0644\u0629 \u0627\u0644\u063a\u0627\u0632\u0627\u062a<\/td>\n<td>\u0625\u0632\u0627\u0644\u0629 \u0627\u0644\u0647\u064a\u062f\u0631\u0648\u062c\u064a\u0646 \u0627\u0644\u0645\u0630\u0627\u0628<\/td>\n<td>Nitrogen or argon bubbles<\/td>\n<\/tr>\n<tr>\n<td>\u0627\u0644\u062a\u0631\u0634\u064a\u062d<\/td>\n<td>Remove non-metallic inclusions<\/td>\n<td>Ceramic foam filter, plate filter, cartridge filter<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>A typical aluminum casting process may therefore use:<\/p>\n<p><strong>Melting \u2192 Holding \u2192 Refining \u2192 Degassing \u2192 Filtration \u2192 Casting<\/strong><\/p>\n<p>Degassing reduces dissolved hydrogen, while filtration removes suspended inclusions. Both processes can be combined to improve molten aluminum cleanliness before casting.<\/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\/ceramic-foam-filter\/\" target=\"_blank\" rel=\"noopener\">Learn More About Our Molten-Aluminum Treatment<\/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 the aluminum degassing process?<\/summary>\n<p>The aluminum degassing process removes dissolved hydrogen from molten aluminum before casting, mainly by introducing fine nitrogen or argon bubbles into the melt.<\/p>\n<\/details>\n<details>\n<summary>2. Why is hydrogen removed from molten aluminum?<\/summary>\n<p>Excess dissolved hydrogen can form pores during solidification, reducing the internal quality and mechanical properties of aluminum castings.<\/p>\n<\/details>\n<details>\n<summary>3. How does degassing remove hydrogen from aluminum?<\/summary>\n<p>Dissolved hydrogen moves to the gas-liquid interface, transfers into inert-gas bubbles, and escapes from the melt as the bubbles rise to the surface.<\/p>\n<\/details>\n<details>\n<summary>4. Why are nitrogen and argon used for aluminum degassing?<\/summary>\n<p>Nitrogen and argon provide inert gas bubbles that carry hydrogen out of the molten aluminum without intentionally reacting with the metal.<\/p>\n<\/details>\n<details>\n<summary>5. Does nitrogen react with hydrogen during degassing?<\/summary>\n<p>No. Nitrogen primarily acts as a carrier gas. Hydrogen is removed through mass transfer from the molten aluminum into the gas bubbles.<\/p>\n<\/details>\n<details>\n<summary>6. Why are fine bubbles used in aluminum degassing?<\/summary>\n<p>Fine bubbles provide a larger gas-liquid interfacial area, creating more surface area for dissolved hydrogen to transfer into the gas phase.<\/p>\n<\/details>\n<details>\n<summary>7. What factors affect aluminum degassing efficiency?<\/summary>\n<p>Important factors include bubble size, gas flow rate, rotor speed, rotor design, melt temperature, treatment time, melt depth, and initial hydrogen concentration.<\/p>\n<\/details>\n<details>\n<summary>8. Does aluminum degassing remove non-metallic inclusions?<\/summary>\n<p>Degassing mainly removes dissolved hydrogen. Non-metallic inclusions are primarily removed through filtration, such as ceramic foam filters or other molten aluminum filtration systems.<\/p>\n<\/details>\n<details>\n<summary>9. What is the difference between degassing and filtration?<\/summary>\n<p>Degassing reduces dissolved hydrogen, while filtration removes suspended non-metallic inclusions. They are complementary melt-treatment processes.<\/p>\n<\/details>\n<details>\n<summary>10. Can aluminum degassing remove all dissolved hydrogen?<\/summary>\n<p>No. The achievable hydrogen level depends on the alloy, initial hydrogen content, equipment design, gas flow, rotor conditions, melt temperature, and treatment time.<\/p>\n<\/details>","protected":false},"excerpt":{"rendered":"<p>The aluminum degassing process removes dissolved hydrogen from molten aluminum before casting. Hydrogen can cause porosity and other internal defects when its solubility drops during solidification. In industrial aluminum processing, nitrogen or argon is introduced into the melt to form fine gas bubbles, providing surfaces for dissolved hydrogen to transfer into and escape. How Does [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2748,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[1219,70,42,2784,90,2759,2801,7197,36,35,2755,2506,2505,7198,38,7017,1225,69,1899,2523,743],"class_list":["post-2747","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-alcan-smelter-aluminum-degassing","tag-aluminium-degassing","tag-aluminum-degassing","tag-aluminum-degassing-equipment","tag-aluminum-degassing-process","tag-aluminum-degassing-treatment","tag-aluminum-melt-degassing-and-refining","tag-degassing-aluminium","tag-degassing-aluminum","tag-degassing-aluminum-casting","tag-degassing-and-purification-system","tag-degassing-molten-aluminum","tag-degassing-process-in-aluminium","tag-degassing-refining","tag-degassing-system","tag-flux-degassing","tag-in-line-degasser","tag-molten-aluminum-refining-degassing","tag-online-degassing-units","tag-refining-and-degassing","tag-rotating-degassing-system"],"yoast_head":"<!-- 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