Flux de d\u00e9capage<\/a> favoriser la s\u00e9paration de l'aluminium fondu pi\u00e9g\u00e9 dans les scories. Outre les chlorures et les fluorures, les flux de d\u00e9carburation contiennent des composants oxydants qui r\u00e9agissent de mani\u00e8re exothermique avec l\u2019aluminium lorsqu\u2019ils sont chauff\u00e9s. La chaleur g\u00e9n\u00e9r\u00e9e par le flux de d\u00e9carburation am\u00e9liore la mouillabilit\u00e9 et la fluidit\u00e9 de l\u2019aluminium pi\u00e9g\u00e9, dont les gouttes fusionnent et s\u2019\u00e9coulent vers la masse fondue. Les scories trait\u00e9es par le flux de d\u00e9carburation sont poudreuses et s\u00e8ches. Elles s\u2019\u00e9vacuent facilement du four. Les flux de d\u00e9carburation contribuent \u00e0 r\u00e9duire les pertes d\u2019aluminium, ce qui les rend tr\u00e8s rentables, en particulier lors de la refonte de d\u00e9chets d\u2019aluminium.<\/p>\nLes fondants pour l'aluminium en fusion, compos\u00e9s de sels contenant du chlore et du fluor, sont utilis\u00e9s pour le d\u00e9gazage des alliages d'aluminium en fusion. Les fondants de d\u00e9gazage se pr\u00e9sentent g\u00e9n\u00e9ralement sous forme de pastilles. L'op\u00e9ration de d\u00e9gazage commence lorsqu'une pastille de fondant est plong\u00e9e au fond du four \u00e0 l'aide d'une cloche perfor\u00e9e, propre et pr\u00e9chauff\u00e9e. Les composants du flux r\u00e9agissent avec l\u2019aluminium pour former des compos\u00e9s gazeux. Le gaz bouillonne et remonte \u00e0 travers le bain fondu. La pression partielle de l\u2019hydrog\u00e8ne dans les bulles form\u00e9es \u00e9tant tr\u00e8s faible, celui-ci se diffuse de l\u2019aluminium fondu vers les bulles. Les bulles s\u2019\u00e9chappent du bain fondu et le gaz est ensuite \u00e9vacu\u00e9 par le syst\u00e8me d\u2019aspiration. Le processus se poursuit jusqu\u2019\u00e0 ce que le bouillonnement cesse. Le flux de d\u00e9gazage peut \u00e9galement \u00eatre introduit par une m\u00e9thode d\u2019injection. Dans ce cas, le gaz inerte sert de vecteur pour le flux granul\u00e9. Outre l\u2019effet de d\u00e9gazage, ce traitement permet d\u2019\u00e9liminer les inclusions non m\u00e9talliques en suspension dans le bain fondu.<\/p>","protected":false},"excerpt":{"rendered":"
Melting Aluminum Fluxes are used in aluminum foundries, so as to reduce the melt oxidation, minimize penetration of the atmospheric hydrogen, absorb non-metallic inclusions suspended…<\/p>","protected":false},"author":1,"featured_media":10543,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120],"tags":[],"class_list":["post-10542","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fluxes"],"yoast_head":"\n
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<\/p>\n