{"id":10578,"date":"2021-10-13T08:58:31","date_gmt":"2021-10-13T08:58:31","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10578"},"modified":"2021-10-13T08:58:31","modified_gmt":"2021-10-13T08:58:31","slug":"aluminium-degassing-flux","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/es\/aluminium-degassing-flux\/","title":{"rendered":"Fundente para la desgasificaci\u00f3n del aluminio"},"content":{"rendered":"<p>El fundente desgasificante de aluminio para fundici\u00f3n permite eliminar las inclusiones o los contaminantes gaseosos del metal fundido mediante gases inertes o reactivos.<\/p>\n<p>Los fundentes s\u00f3lidos, como los polvos, las escamas o los gr\u00e1nulos, suelen estar compuestos por cloruros y fluoruros, adem\u00e1s de aditivos adicionales que les confieren propiedades especiales.<\/p>\n<p>La mayor\u00eda <a href=\"http:\/\/www.alalloycasting.com\/es\/adtech-fluxes\/\">flujos<\/a> se basan en una mezcla de sales de KCl y NaCl, que forman un eut\u00e9ctico a baja temperatura (665 \u00ba\u0421). Otro componente habitual del fundente es el fluoruro de sodio (NaF), que forma un eut\u00e9ctico ternario con KCl y NaCl, con un punto de fusi\u00f3n de 607 grados Celsius. El fundente habitual para recubrimientos contiene aproximadamente un 47,5% de NaCl, un 47,5% de KCl y un 5% de sal de fluoruro. La baja temperatura de fusi\u00f3n es importante, ya que aumenta la fluidez del fundente.<\/p>\n<h2>Funci\u00f3n del fundente para la desgasificaci\u00f3n del aluminio<\/h2>\n<p>Algunos compuestos se descomponen al emitir gases, como el cloro o el di\u00f3xido de carbono. Si estos flujos penetran por debajo de la superficie del ba\u00f1o fundido, formar\u00e1n burbujas, lo que reducir\u00e1 el contenido de hidr\u00f3geno en el ba\u00f1o fundido. El m\u00e1s conocido de estos compuestos es el hexacloroetano (C\u2082Cl\u2086), que se descompone en compuestos gaseosos de cloro (Cl\u2082) y AlCl\u2083.<\/p>\n<p>La sal fluorada del metal alcalino act\u00faa como tensioactivo, reduciendo la tensi\u00f3n superficial entre el fundente y la superficie met\u00e1lica, as\u00ed como entre el fundente y el \u00f3xido. La sal clorada presenta esta caracter\u00edstica en menor medida.<\/p>\n<p>Las sales de fluoruro de metales alcalinos tienen la capacidad de disolver \u00f3xidos (aunque en muy peque\u00f1a medida), lo que les permite penetrar en la pel\u00edcula de \u00f3xido presente en la escoria y depositarse en la pared del horno. Esto mejora la humectabilidad, lo que favorece la separaci\u00f3n de las inclusiones de \u00f3xido de la masa fundida y del aluminio met\u00e1lico de la escoria.<\/p>\n<p>Los aditivos a base de nitrato, como el KNO\u2083, pueden provocar la liberaci\u00f3n de calor. Estos fundentes son exot\u00e9rmicos. El ox\u00edgeno liberado por la descomposici\u00f3n del nitrato reacciona con el aluminio met\u00e1lico para formar Al\u2082O\u2083 y generar una gran cantidad de calor. Esto aumenta localmente la velocidad de renovaci\u00f3n y favorece la separaci\u00f3n del \u00f3xido met\u00e1lico. Al utilizarse el fundente para limpiar el horno, esta reacci\u00f3n acelera la penetraci\u00f3n del fundente en la pared del horno.<\/p>","protected":false},"excerpt":{"rendered":"<p>Aluminium Degassing Flux for foundry can remove inclusions or gaseous contaminants in the molten metal with inert or reactive gases. Solid fluxes, such as powders,&hellip;<\/p>","protected":false},"author":1,"featured_media":10579,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10578","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Aluminium Degassing Flux for Foundry -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"Aluminium Degassing Flux for foundry can remove inclusions or gaseous contaminants in the molten metal with inert or reactive gases.\" \/>\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\/es\/aluminium-degassing-flux\/\" \/>\n<meta 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