{"id":4947,"date":"2020-09-19T06:25:00","date_gmt":"2020-09-19T06:25:00","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4947"},"modified":"2020-09-19T06:25:00","modified_gmt":"2020-09-19T06:25:00","slug":"metal-cleanliness","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/metal-cleanliness\/","title":{"rendered":"Limpeza do metal"},"content":{"rendered":"<p>A pureza do alum\u00ednio fundido \u2014 ou seja, a redu\u00e7\u00e3o das inclus\u00f5es no alum\u00ednio fundido \u2014 \u00e9 um fator de grande import\u00e2ncia na produ\u00e7\u00e3o de produtos de alta qualidade. As inclus\u00f5es na liga de alum\u00ednio tornam a estrutura da liga descont\u00ednua, reduzem a compacta\u00e7\u00e3o do produto, provocam corros\u00e3o e fissuras e diminuem as propriedades mec\u00e2nicas do produto final.<\/p>\n<p>De acordo com os diferentes usos dos produtos finais, os requisitos relativos ao n\u00edvel de limpeza do metal tamb\u00e9m variam. Quanto mais rigorosos forem os requisitos do produto final (latas, dissipadores de calor etc.) ou quanto se tratar da produ\u00e7\u00e3o de chapas e folhas de alta precis\u00e3o com requisitos mais elevados de qualidade superficial (base de chapas PS, chapas decorativas espelhadas etc.), maior ser\u00e1 a exig\u00eancia quanto \u00e0 limpeza da massa fundida.<\/p>\n<p>No processo de refundi\u00e7\u00e3o, dependendo da composi\u00e7\u00e3o da carga do forno, o cl\u00ednquer \u2014 como material triturado, material de aparas e material em placas \u2014 sofre forte oxida\u00e7\u00e3o e cont\u00e9m diversos tipos de inclus\u00f5es n\u00e3o met\u00e1licas. As mais comuns s\u00e3o o p\u00f3 de alumina em fase alfa, part\u00edculas refrat\u00e1rias \u00e0 base de espin\u00e9lio de magn\u00e9sia-alumina (MgAl\u2082O\u2084), pel\u00edcula de \u00f3xido, boreto, \u00f3xido de magn\u00e9sio e cloreto de magn\u00e9sio, al\u00e9m de outros \u00f3xidos n\u00e3o met\u00e1licos. Inclus\u00f5es que excedam o teor especificado podem causar diversos problemas, como danos \u00e0 continuidade da liga de alum\u00ednio, forma\u00e7\u00e3o de porosidade ou fratura da tira.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4948\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/09\/Metal-Cleanliness.jpg\" alt=\"Limpeza do metal\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Metal-Cleanliness.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/09\/Metal-Cleanliness-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>Quando a chapa de alum\u00ednio \u00e9 utilizada como base para a chapa de PS, a deforma\u00e7\u00e3o ocorre durante a lamina\u00e7\u00e3o, e as inclus\u00f5es formam poros de areia na superf\u00edcie do produto final. Al\u00e9m disso, algumas inclus\u00f5es s\u00f3lidas muito duras (como part\u00edculas refrat\u00e1rias) danificam a superf\u00edcie dos rolos do laminador, deixam marcas repetidas na tira e tornam-se a causa de trincas.<\/p>\n<p>O hidrog\u00eanio presente no alum\u00ednio fundido prov\u00e9m principalmente da intensa rea\u00e7\u00e3o qu\u00edmica entre o alum\u00ednio e a \u00e1gua contida nos gases do forno, e parte dele prov\u00e9m de outras fontes<\/p>\n<p>O hidrog\u00eanio presente no g\u00e1s do forno ou no ar. Devido \u00e0 alta solubilidade de adsor\u00e7\u00e3o do hidrog\u00eanio no alum\u00ednio fundido, essa \u00e9 a principal forma de absor\u00e7\u00e3o de hidrog\u00eanio nesse material. Al\u00e9m disso, o lingote de alum\u00ednio entra facilmente em contato com o vapor de \u00e1gua presente no ar e absorve umidade quando armazenado ao ar livre, o que tamb\u00e9m \u00e9 uma raz\u00e3o importante para o aumento do teor de ar no alum\u00ednio fundido. Quanto mais alta for a temperatura da solu\u00e7\u00e3o, maior ser\u00e1 a solubilidade do hidrog\u00eanio no alum\u00ednio fundido, sendo inevit\u00e1vel que o lingote contenha hidrog\u00eanio.<\/p>\n<p>A presen\u00e7a de hidrog\u00eanio na massa fundida de alum\u00ednio pode causar porosidade, pequenas manchas brancas e outros defeitos no processo de solidifica\u00e7\u00e3o do lingote.<\/p>\n<p>Quando a temperatura do lingote aumenta significativamente, os poros mencionados acima formam buracos de areia na superf\u00edcie do lingote, desde a lamina\u00e7\u00e3o a quente at\u00e9 o recozimento. Durante o processo de lamina\u00e7\u00e3o, a borda da tira racha.<\/p>\n<p>Conforme discutido anteriormente, no processo de fabrica\u00e7\u00e3o de lingotes, o controle da pureza do metal fundido faz parte do pr\u00f3prio processo de fabrica\u00e7\u00e3o.<\/p>\n<p>Essa \u00e9 uma etapa muito importante, e \u00e9 por isso que \u00e9 necess\u00e1rio tratar o metal alcalino presente no alum\u00ednio l\u00edquido eletrol\u00edtico, tratar o metal alcalino e as inclus\u00f5es na massa fundida no forno e remover o hidrog\u00eanio no <a href=\"http:\/\/www.alalloycasting.com\/pt\/casting-launder-2\/\">canal de fundi\u00e7\u00e3o<\/a> durante as diferentes etapas do processo de tratamento do alum\u00ednio fundido.<\/p>","protected":false},"excerpt":{"rendered":"<p>The metal cleanliness of aluminum melt, that is to reduce the inclusion of aluminum melt, is a very important factor in the production of high-quality&hellip;<\/p>","protected":false},"author":1,"featured_media":4949,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-4947","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>Metal Cleanliness in the Manufacturing Process of Ingots<\/title>\n<meta name=\"description\" content=\"The metal cleanliness is a very important factor in the production of high-quality products. 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