{"id":10536,"date":"2021-10-12T07:53:36","date_gmt":"2021-10-12T07:53:36","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10536"},"modified":"2021-10-12T07:53:36","modified_gmt":"2021-10-12T07:53:36","slug":"aluminum-smelter-fluxes","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminum-smelter-fluxes\/","title":{"rendered":"Fluxos para fundi\u00e7\u00f5es de alum\u00ednio"},"content":{"rendered":"

H\u00e1 muitos anos, as fundi\u00e7\u00f5es utilizam fluxos de fundi\u00e7\u00e3o de alum\u00ednio para reduzir o desperd\u00edcio de liga, controlar a forma\u00e7\u00e3o de esc\u00f3ria e remover impurezas da liga; caso contr\u00e1rio, essas impurezas afetariam a qualidade.<\/p>\n

Os fundentes utilizados em fundi\u00e7\u00f5es de alum\u00ednio s\u00e3o geralmente uma mistura de sais de cloreto e fluoreto, que minimizam a penetra\u00e7\u00e3o de hidrog\u00eanio atmosf\u00e9rico e absorvem as inclus\u00f5es n\u00e3o met\u00e1licas suspensas na massa fundida.<\/p>\n

As ligas de alum\u00ednio tendem a absorver hidrog\u00eanio e s\u00e3o facilmente oxidadas quando as ligas fundidas s\u00e3o expostas \u00e0 atmosfera ou \u00e0 umidade. O processo de oxida\u00e7\u00e3o forma uma pel\u00edcula cont\u00ednua de alumina na superf\u00edcie. Embora essa pel\u00edcula permane\u00e7a est\u00e1vel, ela protege a liga fundida contra oxida\u00e7\u00e3o adicional.<\/p>\n

Na fundi\u00e7\u00e3o, o movimento faz parte do processo, o que causa rachaduras superficiais, maior oxida\u00e7\u00e3o e r\u00e1pido espessamento da pel\u00edcula superficial. Essa camada que se espessa continuamente tamb\u00e9m \u00e9 envolvida por alum\u00ednio n\u00e3o oxidado, resultando em \u201cesc\u00f3ria \u00famida\u201d e no desperd\u00edcio de grandes quantidades de ligas. Em uma esc\u00f3ria \u00famida t\u00edpica, apenas 20% a 40% \u00e9 de alumina, e o restante \u00e9 composto por alum\u00ednio encapsulado. Isso resulta em um desperd\u00edcio de 5% a 10% da quantidade total de metal fundido.<\/p>\n

\"Agente<\/p>\n

Fluxo de cobertura<\/a> e os fundentes de esc\u00f3ria s\u00e3o utilizados para reduzir a oxida\u00e7\u00e3o e a adsor\u00e7\u00e3o de hidrog\u00eanio, formando uma \u201ccamada\u201d de barreira de fus\u00e3o na superf\u00edcie da liga; esses problemas s\u00e3o resolvidos pela redu\u00e7\u00e3o da espessura da camada de esc\u00f3ria. Como a crosta n\u00e3o se torna t\u00e3o espessa, esses fundentes podem reduzir a quantidade de metal l\u00edquido em suspens\u00e3o em 60% \u2013 80%.<\/p>\n

Al\u00e9m da oxida\u00e7\u00e3o e da absor\u00e7\u00e3o de g\u00e1s, as ligas de alum\u00ednio tamb\u00e9m s\u00e3o vulner\u00e1veis a impurezas met\u00e1licas e n\u00e3o met\u00e1licas suspensas nas ligas fundidas. As impurezas e a alumina permanecem suspensas porque s\u00e3o porosas e cont\u00eam algum g\u00e1s que adere aos poros e fica retido neles. Essas impurezas podem ser introduzidas na massa fundida durante as opera\u00e7\u00f5es de carregamento, processamento ou manuseio e devem ser removidas para que a qualidade e a consist\u00eancia da pe\u00e7a fundida final sejam mantidas. O fluxo de limpeza \u00e9 utilizado para remover inclus\u00f5es n\u00e3o met\u00e1licas da massa fundida.<\/p>","protected":false},"excerpt":{"rendered":"

For many years, foundries have used aluminum smelter fluxes to reduce alloy waste, control scum formation, and remove impurities in the alloy, otherwise, these impurities…<\/p>","protected":false},"author":1,"featured_media":10537,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120],"tags":[],"class_list":["post-10536","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fluxes"],"yoast_head":"\nAluminum Smelter Fluxes -sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"Foundries have used aluminum smelter fluxes to reduce alloy waste, control scum formation, and remove impurities in the alloy.\" \/>\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-smelter-fluxes\/\" \/>\n<meta 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