{"id":6439,"date":"2020-11-13T09:08:00","date_gmt":"2020-11-13T09:08:00","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6439"},"modified":"2020-11-13T09:08:00","modified_gmt":"2020-11-13T09:08:00","slug":"determination-of-hydrogen-content","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/determination-of-hydrogen-content\/","title":{"rendered":"D\u00e9termination de la teneur en hydrog\u00e8ne"},"content":{"rendered":"<p>Le contr\u00f4le qualit\u00e9 de la masse d'aluminium en fusion avant son introduction dans le four, au cours du processus de fusion ou avant la coul\u00e9e, constitue une \u00e9tape importante pour garantir l'obtention d'une masse d'aluminium de haute qualit\u00e9 et de pi\u00e8ces moul\u00e9es conformes aux sp\u00e9cifications. Une \u00e9valuation rapide et pr\u00e9cise de la qualit\u00e9 du bain d'aluminium destin\u00e9 \u00e0 la coul\u00e9e est effectu\u00e9e. C'est l'objectif poursuivi par l'industrie de la fonderie d'alliages d'aluminium. \u00c0 l'heure actuelle, le contr\u00f4le qualit\u00e9 du bain d'aluminium comprend principalement la d\u00e9termination de la teneur en hydrog\u00e8ne et l'inspection des inclusions non m\u00e9talliques.<\/p>\n<p>\u00c0 l'heure actuelle, il existe de nombreuses m\u00e9thodes de d\u00e9termination de la teneur en hydrog\u00e8ne, tant en France qu'\u00e0 l'\u00e9tranger, ainsi que de nombreuses m\u00e9thodes de classification. Par exemple, en fonction des diff\u00e9rents objets d'analyse, on peut distinguer deux cat\u00e9gories : celles o\u00f9 l'objet d'analyse est la masse fondue ou les pi\u00e8ces solidifi\u00e9es de l'alliage, et celles o\u00f9 l'objet d'analyse est l'hydrog\u00e8ne lui-m\u00eame. Parmi celles-ci, les m\u00e9thodes de d\u00e9tection utilisant l\u2019alliage comme objet d\u2019analyse comprennent la m\u00e9thode d\u2019observation du niveau de liquide, la m\u00e9thode d\u2019analyse par rupture, la m\u00e9thode de d\u00e9tection macrostructurale, la m\u00e9thode de mesure de la densit\u00e9 et la m\u00e9thode de mesure \u00e9lectrique (y compris la m\u00e9thode de la cellule de concentration et la m\u00e9thode de la c\u00e9ramique conductrice de protons). Quant aux m\u00e9thodes utilisant l\u2019hydrog\u00e8ne comme objet d\u2019analyse, elles peuvent \u00eatre class\u00e9es en deux types selon les diff\u00e9rentes m\u00e9thodes d\u2019extraction de l\u2019hydrog\u00e8ne : la m\u00e9thode d\u2019extraction par d\u00e9pression et la m\u00e9thode par gaz vecteur. Les m\u00e9thodes d\u2019extraction par d\u00e9pression comprennent la m\u00e9thode d\u2019extraction thermique sous vide, la m\u00e9thode de la premi\u00e8re bulle, la m\u00e9thode par pression directe, la m\u00e9thode d\u2019extraction directe, la m\u00e9thode de mesure de l\u2019hydrog\u00e8ne de Haber et la m\u00e9thode de la sonde \u00e0 immersion.<\/p>\n<p>AdTech propose des services en ligne <a href=\"http:\/\/www.alalloycasting.com\/fr\/degassing-unit\/\">unit\u00e9 de d\u00e9gazage<\/a> pour l'\u00e9limination de l'hydrog\u00e8ne (H) et des scories de l'aluminium fondu. Le rendement moyen de d\u00e9gazage est de 60%. En cas d'utilisation d'argon et d'une teneur en magn\u00e9sium \u2264 1%, le rendement peut atteindre 0,09 cm\u00b3\/100 g.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-6417\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/11\/Online-Rotary-Degassing-Unit-1.jpg\" alt=\"Unit\u00e9 de d\u00e9gazage rotative en ligne\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/11\/Online-Rotary-Degassing-Unit-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/11\/Online-Rotary-Degassing-Unit-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>L'unit\u00e9 de d\u00e9gazage fonctionne selon le principe de la flottation par gaz. Le rotor injecte un gaz inerte ou un m\u00e9lange de chlore et de gaz inerte dans l'aluminium fondu et divise le gaz en minuscules bulles dispers\u00e9es ; celles-ci remontent \u00e0 la surface de l'aluminium fondu tout en effectuant simultan\u00e9ment les op\u00e9rations suivantes :<\/p>\n<ul>\n<li>L'hydrog\u00e8ne est absorb\u00e9 par les bulles et est \u00e9limin\u00e9.<\/li>\n<li>Le chlorure est \u00e9limin\u00e9 (il se forme par r\u00e9action chimique entre un m\u00e9tal alcalin et du chlore gazeux).<\/li>\n<li>\u00c9liminer les scories.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>The pre-furnace quality inspection of the aluminum melt during the smelting process or before casting is an important step to ensure that high-quality aluminum melt&hellip;<\/p>","protected":false},"author":1,"featured_media":6478,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-6439","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Determination of Hydrogen Content in Aluminum Melt<\/title>\n<meta name=\"description\" content=\"At present, melt quality inspection mainly includes the determination of hydrogen content and the inspection of non-metallic inclusions.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alalloycasting.com\/fr\/determination-of-hydrogen-content\/\" \/>\n<meta property=\"og:locale\" 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