{"id":10551,"date":"2021-10-12T09:19:20","date_gmt":"2021-10-12T09:19:20","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10551"},"modified":"2021-10-12T09:19:20","modified_gmt":"2021-10-12T09:19:20","slug":"foundries-refining-flux","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/foundries-refining-flux\/","title":{"rendered":"Fundi\u00e7\u00f5es: Refinamento de Fluxo"},"content":{"rendered":"

O fluxo de refino utilizado nas fundi\u00e7\u00f5es \u00e9 baseado em uma mistura de sais fundidos, geralmente empregada no processamento de alum\u00ednio fundido. Ele \u00e9 utilizado para proteger passivamente os metais contra a oxida\u00e7\u00e3o e, por vezes, para remover elementos aditivos, na forma de impurezas, do alum\u00ednio fundido. O fluxo consiste principalmente em uma mistura de sais de cloreto e fluoreto, al\u00e9m de aditivos. A maioria dos fluxos \u00e9 composta por uma mistura de NaCl e KCl.<\/p>\n

O fluxo de refino utilizado nas fundi\u00e7\u00f5es serve principalmente para reduzir o teor de hidrog\u00eanio e as inclus\u00f5es. O hidrog\u00eanio dissolvido \u00e9 uma das impurezas mais comuns no alum\u00ednio fundido e \u00e9 altamente indesej\u00e1vel. O hidrog\u00eanio se torna um problema porque \u00e9 insol\u00favel no alum\u00ednio s\u00f3lido. O hidrog\u00eanio dissolvido no alum\u00ednio fundido se solidificar\u00e1 durante a solidifica\u00e7\u00e3o e causar\u00e1 poros no material. As inclus\u00f5es podem ser descritas como part\u00edculas s\u00f3lidas n\u00e3o met\u00e1licas suspensas na massa fundida. A quantidade dessas part\u00edculas depende em grande parte da qualidade e da limpeza dos res\u00edduos. Outras fontes de inclus\u00f5es podem ser os refrat\u00e1rios do forno.<\/p>\n

As principais fun\u00e7\u00f5es do agente refinador tamb\u00e9m incluem: proteger a massa fundida contra oxida\u00e7\u00e3o adicional, por meio da cobertura, dissolu\u00e7\u00e3o ou suspens\u00e3o de impurezas, \u00f3xidos e outras part\u00edculas n\u00e3o met\u00e1licas. As got\u00edculas de compostos salinos atuam como bolhas e suspendem as inclus\u00f5es na superf\u00edcie por flutua\u00e7\u00e3o. Como a velocidade das got\u00edculas de fluxo que sobem \u00e0 superf\u00edcie \u00e9 muito menor do que a das bolhas, \u00e9 necess\u00e1rio um certo tempo de estabiliza\u00e7\u00e3o.<\/p>\n

\"Fluxos<\/p>\n

Existem muitos tipos de fundi\u00e7\u00f5es que refinam fluxos utilizados na fundi\u00e7\u00e3o de ligas de alum\u00ednio, os quais podem ser divididos em duas categorias: agente de cobertura<\/a> e agente refinador<\/a>.<\/p>\n

O fluxo de refino utilizado nas fundi\u00e7\u00f5es no processo de fus\u00e3o de ligas de alum\u00ednio deve atender \u00e0s seguintes condi\u00e7\u00f5es:<\/strong><\/p>\n

1. O ponto de fus\u00e3o deve ser inferior \u00e0 temperatura de fus\u00e3o da liga de alum\u00ednio.
\n2. A densidade deve ser menor do que a da liga de alum\u00ednio.
\n3. \u00c9 capaz de absorver e dissolver as inclus\u00f5es na massa fundida, al\u00e9m de remover o g\u00e1s presente nela.
\n4. N\u00e3o deve apresentar atividade qu\u00edmica com o metal e o revestimento do forno. Caso interaja com o metal, deve gerar apenas g\u00e1s inerte que seja insol\u00favel no metal, e o fluxo deve ser insol\u00favel no metal fundido.
\n5. Baixa absor\u00e7\u00e3o de umidade e baixa press\u00e3o de evapora\u00e7\u00e3o.
\n6. N\u00e3o deve conter nem produzir impurezas e gases nocivos.
\n7. Deve apresentar viscosidade e fluidez adequadas.
\n8. F\u00e1cil de fabricar: pre\u00e7o baixo.<\/p>","protected":false},"excerpt":{"rendered":"

Foundries refining flux is based on the molten salt mixture, usually used for the processing of molten aluminum. It is used to passively protect metals…<\/p>","protected":false},"author":1,"featured_media":10553,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120],"tags":[],"class_list":["post-10551","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fluxes"],"yoast_head":"\nFoundries Refining Flux -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"Foundries refining flux is based on the molten salt mixture, used for reducing the content of hydrogen and inclusions in molten aluminum.\" \/>\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\/foundries-refining-flux\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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