{"id":10526,"date":"2021-10-11T07:39:09","date_gmt":"2021-10-11T07:39:09","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10526"},"modified":"2021-10-11T07:39:09","modified_gmt":"2021-10-11T07:39:09","slug":"aluminum-melt-degassing-treatment","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminum-melt-degassing-treatment\/","title":{"rendered":"Tratamento de desgaseifica\u00e7\u00e3o de alum\u00ednio fundido"},"content":{"rendered":"<p>Como parte importante do tratamento do alum\u00ednio fundido, a desgaseifica\u00e7\u00e3o em linha tem recebido cada vez mais aten\u00e7\u00e3o por parte das fundi\u00e7\u00f5es de alum\u00ednio. A desgaseifica\u00e7\u00e3o e a filtragem s\u00e3o processos importantes no tratamento do alum\u00ednio fundido. A desgaseifica\u00e7\u00e3o em linha, por si s\u00f3, se beneficia do tratamento do alum\u00ednio fundido a montante do forno, bem como da filtragem a jusante do processo de tratamento em linha. Esses processos de tratamento se complementam, e seu efeito geral \u00e9 muito melhor do que o de um \u00fanico processo de tratamento.<\/p>\n<p><strong>Por que o alum\u00ednio fundido deve ser desgaseificado?<\/strong><\/p>\n<p>O principal objetivo do dispositivo de desgaseifica\u00e7\u00e3o online \u00e9 remover o hidrog\u00eanio do alum\u00ednio fundido. O hidrog\u00eanio \u00e9 o \u00fanico g\u00e1s que pode ser dissolvido no alum\u00ednio fundido. A solubilidade do hidrog\u00eanio diminui rapidamente com a solidifica\u00e7\u00e3o do alum\u00ednio fundido durante a fundi\u00e7\u00e3o. Nesse momento, o hidrog\u00eanio se liberta do material fundido, causando poros nos produtos fundidos de alum\u00ednio.<\/p>\n<p>O valor-alvo do teor de hidrog\u00eanio dissolvido depende da aplica\u00e7\u00e3o do produto final, variando de 0,20 ml\/100 gAl para lingotes em estoque da s\u00e9rie 6000 em geral at\u00e9 0,10 ml\/100 gAl para lingotes de lamina\u00e7\u00e3o destinados a aplica\u00e7\u00f5es aeroespaciais. Ao utilizar bolhas de g\u00e1s inerte para remover o hidrog\u00eanio do alum\u00ednio fundido, geralmente se recorre ao arg\u00f4nio e ao nitrog\u00eanio. Como o nitrog\u00eanio tem tend\u00eancia a gerar nitreto de alum\u00ednio \u2014 uma inclus\u00e3o prejudicial que pode aumentar a quantidade de cinzas de alum\u00ednio \u2014, para obter a melhor qualidade do alum\u00ednio fundido, \u00e9 prefer\u00edvel utilizar arg\u00f4nio. A adi\u00e7\u00e3o de uma pequena quantidade de g\u00e1s cloro ao utilizar g\u00e1s inerte para desgaseifica\u00e7\u00e3o pode remover de forma mais eficaz inclus\u00f5es n\u00e3o molhantes e impurezas de metais alcalinos.<\/p>\n<p>As inclus\u00f5es na \u00e1gua de alum\u00ednio prov\u00eam do processo de produ\u00e7\u00e3o de alum\u00ednio eletrol\u00edtico, da refundi\u00e7\u00e3o no forno ou de aditivos internos. As inclus\u00f5es podem causar rasgos e defeitos superficiais durante a lamina\u00e7\u00e3o de chapas, poros min\u00fasculos durante a lamina\u00e7\u00e3o de folhas de alum\u00ednio e causar e aumentar a perda da matriz durante a extrus\u00e3o de alum\u00ednio. A redu\u00e7\u00e3o das inclus\u00f5es n\u00e3o molh\u00e1veis do 50% no sistema de desgaseifica\u00e7\u00e3o \u00e9 um \u00edndice representativo. A filtragem mec\u00e2nica adicional (ou seja, <a href=\"http:\/\/www.alalloycasting.com\/pt\/foam-ceramic-filter-foundry\/\">filtro cer\u00e2mico de espuma<\/a>) tamb\u00e9m \u00e9 uma forma de atingir o \u00edndice de qualidade.<\/p>","protected":false},"excerpt":{"rendered":"<p>As an important part of aluminum melt treatment, online degassing has been paid more and more attention by the aluminum foundry. Degassing and filtering are&hellip;<\/p>","protected":false},"author":1,"featured_media":10528,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10526","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>Aluminum Melt Degassing Treatment, Online Degassing Equipment<\/title>\n<meta name=\"description\" content=\"As an important part of aluminum melt treatment, online degassing has been paid more and more attention by the aluminum foundry.\" \/>\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\/pt\/aluminum-melt-degassing-treatment\/\" \/>\n<meta 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