{"id":10536,"date":"2021-10-12T07:53:36","date_gmt":"2021-10-12T07:53:36","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10536"},"modified":"2021-10-12T07:53:36","modified_gmt":"2021-10-12T07:53:36","slug":"aluminum-smelter-fluxes","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/aluminum-smelter-fluxes\/","title":{"rendered":"Flux pour fonderies d'aluminium"},"content":{"rendered":"

Depuis de nombreuses ann\u00e9es, les fonderies utilisent des fondants destin\u00e9s aux fonderies d'aluminium afin de r\u00e9duire les d\u00e9chets d'alliage, de limiter la formation d'\u00e9cume et d'\u00e9liminer les impuret\u00e9s pr\u00e9sentes dans l'alliage ; sans cela, ces impuret\u00e9s nuiraient \u00e0 la qualit\u00e9 du produit.<\/p>\n

Les flux utilis\u00e9s dans les fonderies d'aluminium sont g\u00e9n\u00e9ralement un m\u00e9lange de sels de chlorure et de fluorure ; ils limitent la p\u00e9n\u00e9tration de l'hydrog\u00e8ne atmosph\u00e9rique et absorbent les inclusions non m\u00e9talliques en suspension dans la masse fondue.<\/p>\n

Les alliages d'aluminium ont tendance \u00e0 absorber l'hydrog\u00e8ne et s'oxydent facilement lorsque les alliages en fusion sont expos\u00e9s \u00e0 l'air ou \u00e0 l'humidit\u00e9. Le processus d'oxydation entra\u00eene la formation d'un film continu d'alumine \u00e0 la surface. Bien que ce film reste stable, il prot\u00e8ge l'alliage en fusion contre toute oxydation suppl\u00e9mentaire.<\/p>\n

Dans la fonderie, les mouvements font partie int\u00e9grante du processus, ce qui provoque des fissures superficielles, une oxydation accrue et un \u00e9paississement rapide du film de surface. Cette couche qui s'\u00e9paissit continuellement est \u00e9galement recouverte d'aluminium non oxyd\u00e9, ce qui donne lieu \u00e0 des \u201c scories humides \u201d et entra\u00eene un gaspillage important d'alliages. Dans une \u00e9cume humide typique, seule une quantit\u00e9 comprise entre 20% et 40% correspond \u00e0 de l\u2019alumine, le reste \u00e9tant constitu\u00e9 d\u2019aluminium encapsul\u00e9. Il en r\u00e9sulte un gaspillage de 5% \u00e0 10% de la quantit\u00e9 totale de m\u00e9tal en fusion.<\/p>\n

\"Agent<\/p>\n

Flux de recouvrement<\/a> Les fondants \u00e0 scories sont utilis\u00e9s pour r\u00e9duire l'oxydation et l'adsorption d'hydrog\u00e8ne en formant une \u201c couche \u201d de barri\u00e8re de fusion \u00e0 la surface de l'alliage ; ces probl\u00e8mes sont r\u00e9solus en r\u00e9duisant l'\u00e9paisseur de la couche de scories. Comme la cro\u00fbte ne s'\u00e9paissit pas excessivement, ces fondants permettent de r\u00e9duire la quantit\u00e9 de m\u00e9tal liquide en suspension de 60% \u00e0 80%.<\/p>\n

Outre l'oxydation et l'absorption de gaz, les alliages d'aluminium sont \u00e9galement sensibles aux impuret\u00e9s m\u00e9talliques et non m\u00e9talliques en suspension dans les alliages fondus. Les impuret\u00e9s et l'alumine restent en suspension car elles sont poreuses et contiennent du gaz qui adh\u00e8re aux pores et y est pi\u00e9g\u00e9. Ces impuret\u00e9s peuvent \u00eatre introduites dans la masse fondue lors des op\u00e9rations de chargement, de traitement ou de manutention, et doivent \u00eatre \u00e9limin\u00e9es si l'on souhaite pr\u00e9server la qualit\u00e9 et l'uniformit\u00e9 de la pi\u00e8ce moul\u00e9e finale. Un flux de nettoyage est utilis\u00e9 pour \u00e9liminer les inclusions non m\u00e9talliques pr\u00e9sentes dans la masse fondue.<\/p>","protected":false},"excerpt":{"rendered":"

For many years, foundries have used aluminum smelter fluxes to reduce alloy waste, control scum formation, and remove impurities in the alloy, otherwise, these impurities…<\/p>","protected":false},"author":1,"featured_media":10537,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120],"tags":[],"class_list":["post-10536","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fluxes"],"yoast_head":"\nAluminum Smelter Fluxes -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"Foundries have used aluminum smelter fluxes to reduce alloy waste, control scum formation, and remove impurities in the alloy.\" \/>\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\/aluminum-smelter-fluxes\/\" \/>\n<meta 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