{"id":10581,"date":"2021-10-13T09:04:08","date_gmt":"2021-10-13T09:04:08","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10581"},"modified":"2021-10-13T09:04:08","modified_gmt":"2021-10-13T09:04:08","slug":"cover-flux","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/cover-flux\/","title":{"rendered":"Fluxo de cobertura"},"content":{"rendered":"

O fluxo de cobertura impede a oxida\u00e7\u00e3o do alum\u00ednio fundido, atuando como uma barreira f\u00edsica. O fluxo de cobertura reduz a taxa de absor\u00e7\u00e3o de hidrog\u00eanio resultante da rea\u00e7\u00e3o entre o alum\u00ednio e a H\u2082O formada pela combust\u00e3o de combust\u00edvel que cont\u00e9m hidrog\u00eanio. O fluxo de cobertura \u00e9 \u00e0 base de MgCl\u2082-KCl e forma um eut\u00e9tico de baixo ponto de fus\u00e3o a 424 \u00b0C. Esses fluxos de cobertura apresentam alta fluidez e formam uma camada fina na superf\u00edcie do metal fundido. Como o MgCl\u2082 \u00e9 caro, ele \u00e9 usado principalmente para tratar ligas de alum\u00ednio com teor extremamente baixo de Na e Ca e teor de magn\u00e9sio superior a 2 wt%<\/p>\n

Os fundentes salinos desempenham um papel importante no processamento do alum\u00ednio fundido. Eles podem prevenir passivamente a oxida\u00e7\u00e3o do metal e, \u00e0s vezes, tamb\u00e9m podem remover ativamente inclus\u00f5es e metais alcalinos. Os fundentes salinos tamb\u00e9m podem ser utilizados para melhorar a recupera\u00e7\u00e3o do metal a partir da esc\u00f3ria e no processo de fus\u00e3o de res\u00edduos recuperados.<\/p>\n

Fluxo para fundi\u00e7\u00e3o de alum\u00ednio<\/a> pode desempenhar v\u00e1rias fun\u00e7\u00f5es, como desgaseifica\u00e7\u00e3o, remo\u00e7\u00e3o de Li, Na, Ca e Mg, remo\u00e7\u00e3o de inclus\u00f5es, limpeza e liga. Al\u00e9m disso, o fundente tamb\u00e9m pode ser utilizado para minimizar a oxida\u00e7\u00e3o e promover a separa\u00e7\u00e3o entre metal e \u00f3xido, aumentando assim as taxas de recupera\u00e7\u00e3o. V\u00e1rios fundentes comuns s\u00e3o baseados na mistura de KCl e NaCl, formando-se um eut\u00e9tico de baixa temperatura (665 \u00b0C) para melhorar a fluidez do fundente.<\/p>\n

O \u00f3xido pode ser removido do alum\u00ednio fundido por meio do tratamento do fluxo. O fluxo \u00e9 \u00e0 base de fluoreto, capaz de se ligar aos \u00f3xidos. A tens\u00e3o interfacial entre os \u00f3xidos met\u00e1licos \u00e9 significativamente maior do que a tens\u00e3o interfacial entre os \u00f3xidos e os fluoretos. Assim, o fluoreto e o \u00f3xido formam uma fase mista, pois o fluoreto, em seu estado de baixa energia, adere ao \u00f3xido e o reveste, permitindo que o alum\u00ednio se separe dessas fases mistas.<\/p>\n

O fluxo encapsula o \u00f3xido e o fluoreto e, em seguida, forma uma fase mista de \u00f3xidos. Isso leva \u00e0 decomposi\u00e7\u00e3o em fragmentos individuais de \u00f3xido. Essas fases mistas de \u00f3xidos fragmentadas t\u00eam a capacidade de flutuar, pois sua densidade \u00e9 muito menor do que a do alum\u00ednio fundido. Isso resulta em uma esc\u00f3ria com baixo teor de metal.<\/p>","protected":false},"excerpt":{"rendered":"

The cover flux prevents oxidation of the molten aluminum by providing a physical barrier. Cover flux will reduce the rate of hydrogen absorption from the…<\/p>","protected":false},"author":1,"featured_media":10582,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10581","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nCover Flux for Molten Aluminum -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"The cover flux prevents oxidation of the molten aluminum by providing a physical barrier. 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