agentes de cobertura<\/a> cont\u00eam 47,5% de KCl, 47,5% de NaCl e 5% de NaF. Quanto ao agente de cobertura, para melhorar sua fluidez, seu ponto de fus\u00e3o deve ser mais baixo. Outros agentes de cobertura s\u00e3o \u00e0 base de MgCl, KCl ou carnallita. Esses agentes de cobertura apresentam boa fluidez e podem formar uma camada fina na superf\u00edcie do alum\u00ednio fundido. No entanto, como o MgCl \u00e9 muito caro, ele \u00e9 geralmente utilizado em fundentes sem s\u00f3dio. Esse fundente \u00e9 utilizado para ligas que cont\u00eam mais de 2% de Mg ou para a remo\u00e7\u00e3o de c\u00e1lcio em ligas de alum\u00ednio com alto teor de magn\u00e9sio.<\/p>\nO fluoreto de metal alcalino \u00e9 um surfactante, capaz de reduzir a tens\u00e3o superficial entre o fluxo da casa de fundi\u00e7\u00e3o e o metal. Em compara\u00e7\u00e3o com o fluoreto de metal alcalino, a limpeza da superf\u00edcie do AIF\u2083, do MgF\u2082 e do cloreto \u00e9 relativamente inferior. Isso ocorre porque, ao utilizar o fluxo \u00e0 base de sal de fluoreto contendo NaP e KP, o alum\u00ednio l\u00edquido pode absorver facilmente parte do s\u00f3dio e do pot\u00e1ssio, e o s\u00f3dio e o pot\u00e1ssio s\u00e3o elementos tensoativos.<\/p>\n
Os fluoretos de metais alcalinos podem dissolver \u00f3xidos em pequenas quantidades, o que ajuda a penetrar na pel\u00edcula de \u00f3xido na superf\u00edcie da esc\u00f3ria, melhorando assim a molhabilidade e auxiliando na separa\u00e7\u00e3o das inclus\u00f5es de \u00f3xido do alum\u00ednio l\u00edquido e do alum\u00ednio da esc\u00f3ria. No entanto, o ponto de fus\u00e3o do fluoreto de metal alcalino \u00e9 geralmente mais alto, o que limita sua aplica\u00e7\u00e3o, e o uso de sal de fluoreto imp\u00f5e requisitos de prote\u00e7\u00e3o ambiental mais rigorosos do que o sal de cloro puro. Os fundentes \u00e0 base de sais fluorados comumente utilizados s\u00e3o a criolita (Na\u2083AlF\u2086), o fluoreto de c\u00e1lcio (CaF\u2082) ou o fluorossilicato de s\u00f3dio (Na\u2082SiF\u2086), e o teor total geralmente fica dentro de 20%.<\/p>\n
Compostos de oxig\u00eanio, como NaNO\u2083 e KNO\u2083, adicionados ao fundente reagem com o alum\u00ednio para formar Al\u2082O\u2083 e liberam uma grande quantidade de calor. Isso pode melhorar localmente a fluidez, aumentando assim o rendimento efetivo do alum\u00ednio. No agente de limpeza do forno, essas rea\u00e7\u00f5es exot\u00e9rmicas podem acelerar a penetra\u00e7\u00e3o do fundente nos res\u00edduos do forno.<\/p>","protected":false},"excerpt":{"rendered":"
The cast house flux is mainly a mixture of chloride and fluoride salts and other additives. Most fluxes are based on KCl and NaCl, and…<\/p>","protected":false},"author":1,"featured_media":10305,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10304","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\n
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