{"id":10346,"date":"2021-09-23T03:43:19","date_gmt":"2021-09-23T03:43:19","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10346"},"modified":"2021-09-23T03:43:19","modified_gmt":"2021-09-23T03:43:19","slug":"aluminium-melting-flux","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/fr\/aluminium-melting-flux\/","title":{"rendered":"Flux de fusion de l'aluminium"},"content":{"rendered":"

Le flux de fusion de l'aluminium doit \u00eatre soigneusement s\u00e9ch\u00e9 au pr\u00e9alable afin d'\u00e9liminer l'humidit\u00e9, ce qui permet d'am\u00e9liorer l'effet d'affinage et d'\u00e9viter les risques d'explosion lors de l'ajout du flux \u00e0 l'aluminium fondu. Le flux chlorur\u00e9 pr\u00e9sente une forte hygroscopicit\u00e9. Le flux doit \u00eatre soigneusement s\u00e9ch\u00e9 avant utilisation. L'\u00e9limination de l'eau adsorb\u00e9e et de l'eau de cristallisation permet d'am\u00e9liorer l'effet d'affinage.<\/p>\n

En g\u00e9n\u00e9ral, les principaux composants de flux pour la coul\u00e9e d'aluminium<\/a> sont le chlorure et le fluorure. Le flux \u00e0 base de chlorure permet de bien mouiller l'oxyde et de bien le faire fondre, et l'ajout de fluorure \u00e0 un flux \u00e0 base de chlorure peut am\u00e9liorer le pouvoir d'affinage de ce dernier.<\/p>\n

Le fluorure am\u00e9liore la capacit\u00e9 d'affinage d'une part parce qu'il augmente la tension interfaciale entre le fondant et la masse fondue, et favorise ainsi l'adsorption du fondant sur l'oxyde ; d'autre part, parce qu'il pr\u00e9sente une r\u00e9activit\u00e9 plus \u00e9lev\u00e9e avec l'aluminium fondu. Des produits de r\u00e9action tensioactifs, tels que le fluorure d\u2019aluminium gazeux et le sodium liquide, se forment \u00e0 l\u2019interface avec l\u2019oxyde, ce qui favorise l\u2019\u00e9limination des oxydes. Lorsqu\u2019on utilise uniquement du chlorure, seule une faible quantit\u00e9 de chlorure d\u2019aluminium gazeux est produite ; l\u2019effet d\u2019affinage n\u2019est donc pas aussi bon qu\u2019avec le fluorure.<\/p>\n

\"\"<\/p>\n

Les op\u00e9rations d'affinage par fondant lors de la fusion de l'aluminium sont r\u00e9alis\u00e9es conform\u00e9ment \u00e0 la r\u00e9glementation. La temp\u00e9rature d'affinage doit \u00eatre maintenue \u00e0 la limite sup\u00e9rieure de la temp\u00e9rature de coul\u00e9e afin d'optimiser l'efficacit\u00e9 de l'affinage. La quantit\u00e9 de fondant doit \u00eatre suffisante. Pour les produits soumis \u00e0 des exigences de puret\u00e9 interne plus \u00e9lev\u00e9es, la quantit\u00e9 peut \u00eatre plus importante ; elle est g\u00e9n\u00e9ralement de 4 \u00e0 5 kg\/t de m\u00e9tal. Pour les produits courants, elle est de 2 \u00e0 3 kg\/t de m\u00e9tal. Une fois l'affinage termin\u00e9, les scories sont imm\u00e9diatement retir\u00e9es, puis le flux de recouvrement est saupoudr\u00e9 et laiss\u00e9 en place. Le temps de repos varie en fonction du produit. Pour les produits importants, le temps de repos ne doit pas \u00eatre inf\u00e9rieur \u00e0 30 minutes, et pour les produits courants, il ne doit pas \u00eatre inf\u00e9rieur \u00e0 15 minutes.<\/p>","protected":false},"excerpt":{"rendered":"

The aluminium melting flux should be thoroughly dried beforehand, so as to remove the moisture, which can improve the refining effect and prevent explosion accidents…<\/p>","protected":false},"author":1,"featured_media":10347,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120],"tags":[],"class_list":["post-10346","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fluxes"],"yoast_head":"\nAluminium Melting Flux -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"The aluminium melting flux should be thoroughly dried beforehand, so as to remove the moisture, which can improve the refining effect.\" \/>\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\/aluminium-melting-flux\/\" \/>\n<meta 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