\u00e9limination des scories<\/a> L'effet de l'aluminium fondu est limit\u00e9. Afin d'am\u00e9liorer l'efficacit\u00e9 de la purification, plus le nombre de bulles produites par l'injection du gaz raffin\u00e9 est \u00e9lev\u00e9, plus le rayon des bulles est petit, plus leur r\u00e9partition est homog\u00e8ne et plus la dur\u00e9e d'injection est longue, meilleur est l'effet de d\u00e9gazage.<\/p>\nLe d\u00e9gazage de l'hydrog\u00e8ne repose sur le principe du d\u00e9gazage par diff\u00e9rence de pression partielle. En raison de la diff\u00e9rence de pression partielle d'\u00e9quilibre entre la bulle et l'aluminium fondu, l'hydrog\u00e8ne dissous dans le m\u00e9tal se diffuse en continu dans la bulle. Ce processus ne s'arr\u00eate que lorsque la pression partielle de l'hydrog\u00e8ne dans la bulle est \u00e9gale \u00e0 la pression partielle d'\u00e9quilibre de l'hydrog\u00e8ne dans l'aluminium fondu. Une fois que les bulles remontent \u00e0 la surface, l'hydrog\u00e8ne qu'elles contiennent s'\u00e9chappe \u00e9galement dans l'atmosph\u00e8re. Par cons\u00e9quent, tant les inclusions oxyd\u00e9es que l\u2019argon sont \u00e9vacu\u00e9s lors de la remont\u00e9e des bulles. La temp\u00e9rature de l\u2019argon doit \u00eatre maintenue entre 710 et 720 \u00b0C afin d\u2019\u00e9viter la formation de nitrure d\u2019aluminium r\u00e9sultant de la r\u00e9action entre l\u2019hydrog\u00e8ne et l\u2019aluminium fondu.<\/p>","protected":false},"excerpt":{"rendered":"
Aluminum alloy liquid degassing of hydrogen can use the adsorption effect of refining agent to achieve the effect of removing oxidized impurities and gas. Inert…<\/p>","protected":false},"author":1,"featured_media":6398,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-6397","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\n
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