machines de d\u00e9gazage rotatives<\/a>\u00a0offrir une m\u00e9thode plus efficace et plus propre pour \u00e9liminer l'hydrog\u00e8ne de l'aluminium fondu. L'hydrog\u00e8ne dissous dans l'aluminium fondu se diffuse alors dans ces bulles et se s\u00e9pare de la phase liquide.<\/p>\nAvant la coul\u00e9e, l'aluminium fondu contient de l'hydrog\u00e8ne dissous et des inclusions non m\u00e9talliques, telles que des oxydes d'aluminium et de magn\u00e9sium, qui constituent des impuret\u00e9s ind\u00e9sirables. La pr\u00e9sence d'hydrog\u00e8ne et d'inclusions non m\u00e9talliques dans l'aluminium fondu peut entra\u00eener l'apparition de d\u00e9fauts dans les lingots obtenus \u00e0 partir de cette masse fondue, ainsi que dans les produits fabriqu\u00e9s \u00e0 partir de ces lingots. Il est donc n\u00e9cessaire d'\u00e9liminer l'hydrog\u00e8ne et les inclusions non m\u00e9talliques du m\u00e9tal fondu.<\/p>\n
En r\u00e8gle g\u00e9n\u00e9rale, on injecte du gaz inerte ou du chlore gazeux dans le m\u00e9tal en fusion sous forme de bulles afin d'\u00e9liminer l'hydrog\u00e8ne et les inclusions non m\u00e9talliques de l'aluminium en fusion. Cependant, comme l\u2019atmosph\u00e8re contient de l\u2019eau, l\u2019aluminium et l\u2019eau pr\u00e9sents dans l\u2019atmosph\u00e8re r\u00e9agissent \u00e0 la surface du m\u00e9tal en fusion (2Al + 3H\u2082O \u2192 3Al\u2082O\u2083 + 3H\u2082), ce qui entra\u00eene un probl\u00e8me de p\u00e9n\u00e9tration d\u2019hydrog\u00e8ne dans la masse fondue. La surface de l\u2019aluminium fondu laiss\u00e9 au repos est g\u00e9n\u00e9ralement recouverte d\u2019une couche dense d\u2019oxyde d\u2019aluminium, ce qui emp\u00eache l\u2019eau de l\u2019atmosph\u00e8re de r\u00e9agir avec l\u2019aluminium.<\/p>\n
Le principe de fonctionnement de l'\u00e9quipement de d\u00e9gazage rotatif en ligne de l'aluminium fondu repose sur le principe de la flottation par gaz. Le gaz de traitement (gaz inerte ou m\u00e9lange de gaz inerte et de chlore) est inject\u00e9 dans la masse fondue par le rotor, o\u00f9 il est fragment\u00e9 en minuscules bulles uniform\u00e9ment dispers\u00e9es, qui remontent ensuite vers la surface de la masse fondue. L'hydrog\u00e8ne est absorb\u00e9 par les bulles et \u00e9limin\u00e9, tandis que les inclusions sont pi\u00e9g\u00e9es par celles-ci, puis remontent \u00e0 la surface du bain fondu.<\/p>","protected":false},"excerpt":{"rendered":"
Degassing of molten aluminum is an essential process in alloy casting. It is done by one of two methods: flux or rotary degassing. The molten…<\/p>","protected":false},"author":1,"featured_media":6947,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-6943","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\n
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