{"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\/es\/cover-flux\/","title":{"rendered":"Flujo de cobertura"},"content":{"rendered":"

El fundente de recubrimiento evita la oxidaci\u00f3n del aluminio fundido al actuar como barrera f\u00edsica. Este fundente reduce la velocidad de absorci\u00f3n de hidr\u00f3geno derivada de la reacci\u00f3n entre el aluminio y el H\u2082O que se forma al quemar combustible que contiene hidr\u00f3geno. El fundente de recubrimiento est\u00e1 compuesto por MgCl\u2082 y KCl, y forma un eut\u00e9ctico de bajo punto de fusi\u00f3n a 424 \u00b0C. Estos fundentes de recubrimiento tienen una alta fluidez y forman una fina capa sobre la superficie del metal fundido. Dado que el MgCl\u2082 es caro, se utiliza principalmente para tratar aleaciones de aluminio con un contenido extremadamente bajo de Na y Ca y un contenido de magnesio superior al 2 % en peso.<\/p>\n

Los fundentes salinos desempe\u00f1an un papel importante en el procesamiento del aluminio fundido. Pueden prevenir de forma pasiva la oxidaci\u00f3n del metal y, en ocasiones, tambi\u00e9n pueden eliminar de forma activa las inclusiones y los metales alcalinos. Los fundentes salinos tambi\u00e9n pueden utilizarse para mejorar la recuperaci\u00f3n del metal a partir de la escoria y en el proceso de fundici\u00f3n de residuos recuperados.<\/p>\n

Fundente para fundici\u00f3n de aluminio<\/a> Puede desempe\u00f1ar diversas funciones, como la desgasificaci\u00f3n, la eliminaci\u00f3n de Li, Na, Ca y Mg, la eliminaci\u00f3n de inclusiones, la limpieza y la aleaci\u00f3n. Adem\u00e1s, el fundente tambi\u00e9n puede utilizarse para minimizar la oxidaci\u00f3n y favorecer la separaci\u00f3n entre el metal y el \u00f3xido, aumentando as\u00ed los \u00edndices de recuperaci\u00f3n. Varios fundentes comunes se basan en una mezcla de KCl y NaCl, con la que se forma un eut\u00e9ctico a baja temperatura (665 \u00b0C) para mejorar la fluidez del fundente.<\/p>\n

El \u00f3xido puede eliminarse del aluminio fundido mediante el tratamiento con fundente. El fundente se basa en fluoruro, capaz de fijar los \u00f3xidos. La tensi\u00f3n interfacial entre los \u00f3xidos met\u00e1licos es significativamente mayor que la tensi\u00f3n interfacial entre los \u00f3xidos y los fluoruros. A continuaci\u00f3n, el fluoruro y el \u00f3xido forman una fase mixta, ya que el fluoruro, en su estado de baja energ\u00eda, se adhiere al \u00f3xido y lo recubre, con lo que el aluminio se separa de estas fases mixtas.<\/p>\n

El fundente encapsula el \u00f3xido y el fluoruro, y a continuaci\u00f3n forma una fase de \u00f3xido mixto. Esto da lugar a la descomposici\u00f3n en fragmentos de \u00f3xido individuales. Estas fases mixtas de \u00f3xido fragmentadas tienen la capacidad de flotar, ya que su densidad es mucho menor que la del aluminio fundido. El resultado es una escoria con un bajo contenido en 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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