{"id":9856,"date":"2021-08-11T08:00:13","date_gmt":"2021-08-11T08:00:13","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=9856"},"modified":"2021-08-11T08:00:13","modified_gmt":"2021-08-11T08:00:13","slug":"non-sodium-flux","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/non-sodium-flux\/","title":{"rendered":"Fluxo sem s\u00f3dio"},"content":{"rendered":"<p>Como fluxo para a adi\u00e7\u00e3o de Na, s\u00e3o amplamente utilizados fluxos \u00e0 base de s\u00f3dio, compostos principalmente por NaF e NaCl. O Na geralmente tem o efeito de promover a dispers\u00e3o de poros em pe\u00e7as fundidas de alum\u00ednio, mas, devido \u00e0 rea\u00e7\u00e3o com a umidade do ar, mesmo que o metal fundido contenha apenas algumas PPM de Na, \u00e9 f\u00e1cil que se forme uma concentra\u00e7\u00e3o mais elevada de hidrog\u00eanio, promovendo assim a oxida\u00e7\u00e3o da superf\u00edcie do metal fundido e a forma\u00e7\u00e3o de esc\u00f3ria. Al\u00e9m disso, nas ligas de alum\u00ednio da s\u00e9rie 5000 que cont\u00eam Mg como principal componente da liga, uma pequena quantidade de Na pode causar fragiliza\u00e7\u00e3o nos limites de gr\u00e3o e provocar deteriora\u00e7\u00e3o significativa no alongamento e em outras propriedades. Portanto, o fluxo sem s\u00f3dio \u00e9 amplamente utilizado como fluxo para a remo\u00e7\u00e3o de esc\u00f3ria de ligas de alum\u00ednio fundidas em linhas de produ\u00e7\u00e3o de fundi\u00e7\u00e3o onde n\u00e3o se deseja adicionar Na.<\/p>\n<p>O fluxo sem s\u00f3dio cont\u00e9m principalmente fluxos \u00e0 base de cloreto, como MgCl\u2082, CaCl\u2082, KCl, etc., que possuem efeito de remo\u00e7\u00e3o de esc\u00f3ria e n\u00e3o cont\u00eam sais de s\u00f3dio, e s\u00e3o misturados com componentes capazes de melhorar a reatividade do alum\u00ednio fundido, como KAIF, AlF\u2083, K\u2082SO\u2084, etc. No entanto, entre os fundentes \u00e0 base de cloreto, o MgCl\u2082 e o CaCl\u2082 s\u00e3o higrosc\u00f3picos e devem ser armazenados com cuidado. Se o fundente que absorver umidade entrar em contato direto com o alum\u00ednio fundido, h\u00e1 risco de explos\u00e3o por vapor de \u00e1gua. Portanto, se poss\u00edvel, o uso de MgCl\u2082 e CaCl\u2082 deve ser evitado ao m\u00e1ximo. Al\u00e9m disso, se o MgCl\u2082 ou o CaCl\u2082 reagirem com a liga de alum\u00ednio fundido, isso emitir\u00e1 um odor e reduzir\u00e1 a efici\u00eancia do trabalho. Pelas raz\u00f5es acima, a menos que sejam utilizados em um forno fechado, os fundentes \u00e0 base de cloreto geralmente n\u00e3o s\u00e3o utilizados.<\/p>\n<p>Portanto, na linha de produ\u00e7\u00e3o de pe\u00e7as fundidas em que o Na n\u00e3o \u00e9 desejado, como um <a href=\"http:\/\/www.alalloycasting.com\/pt\/molten-metal-flux\/\">fundente para metal fundido<\/a>\u00a0Para a remo\u00e7\u00e3o de esc\u00f3ria, o fluxo sem s\u00f3dio cont\u00e9m KCl como principal componente, respons\u00e1vel pelo efeito de remo\u00e7\u00e3o de esc\u00f3ria, al\u00e9m de um componente que melhora a reatividade com o metal fundido, como KAIF\u2083, AlF\u2083 e K\u2082SO\u2084.<\/p>","protected":false},"excerpt":{"rendered":"<p>As a flux for adding Na, sodium-based fluxes mainly composed of NaF and NaCl are widely used. Na usually has the effect of promoting pore&hellip;<\/p>","protected":false},"author":1,"featured_media":9857,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[122,12346,12344,123,12345],"class_list":["post-9856","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminum-casting-flux","tag-molten-aluminum-alloys","tag-non-sodium-flux","tag-refining-flux","tag-slag-removal"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Non sodium Flux for Slag Removal in Molten Aluminum Alloys<\/title>\n<meta name=\"description\" content=\"Non sodium flux is widely used as a flux for slag removal of molten aluminum alloys in casting production lines where it is no Na.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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