unit\u00e9 de d\u00e9gazage<\/a> C'est que lorsque le moteur entra\u00eene le rotor en rotation (g\u00e9n\u00e9ralement \u00e0 une vitesse comprise entre 380 tr\/min et 450 tr\/min), l'argon (d\u00e9bit compris entre 0,5 m\u00b3\/h et 1,5 m\u00b3\/h) se fragmente en tr\u00e8s petites bulles. La pr\u00e9sence de ces petites bulles r\u00e9duit la concentration d'hydrog\u00e8ne dans l'aluminium fondu ainsi que la pression partielle \u00e0 sa surface, ce qui permet de r\u00e9duire la concentration d\u2019hydrog\u00e8ne dans l\u2019aluminium fondu, de sorte que l\u2019hydrog\u00e8ne est \u00e9vacu\u00e9 de la surface de l\u2019aluminium fondu par l\u2019argon, puis br\u00fbl\u00e9 \u00e0 la surface du liquide.<\/p>\n![\"Affinage](\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/10\/Refining-Aluminum-with-Argon-1.jpg\")
<\/p>\n
De plus, lorsque les petites bulles d\u2019argon remontent vers la surface du liquide au fond de l\u2019aluminium fondu, l\u2019hydrog\u00e8ne dissous dans l\u2019aluminium fondu entre en contact avec l\u2019interface liquide argon-aluminium ; il passe alors d\u2019un \u00e9tat dissous \u00e0 un \u00e9tat adsorb\u00e9, au sein de la couche d\u2019adsorption. Les atomes de gaz pr\u00e9sents dans le gaz r\u00e9agissent pour former des mol\u00e9cules d\u2019hydrog\u00e8ne. \u00c0 mesure que les bulles grossissent, elles remontent \u00e0 la surface de l\u2019aluminium fondu et br\u00fblent. De plus, lorsque de petites bulles d\u2019argon se d\u00e9placent du fond de l\u2019aluminium fondu vers la surface du liquide, les particules en suspension dans l\u2019aluminium fondu sont agit\u00e9es, et les inclusions entrent en collision, s\u2019agr\u00e8gent et grossissent. Lorsque les inclusions atteignent une certaine taille, elles peuvent entrer en collision avec les bulles flottantes, \u00eatre captur\u00e9es, puis amen\u00e9es \u00e0 la surface du liquide, ce qui permet d\u2019obtenir un effet d\u2019\u00e9limination des scories.<\/p>","protected":false},"excerpt":{"rendered":"
Pinhole defects in aluminum alloy castings are the most prominent cause of casting scrap. The existence of pinholes not only reduces the effective working area…<\/p>","protected":false},"author":1,"featured_media":5487,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-5486","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\n
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