{"id":2065,"date":"2020-05-27T10:23:01","date_gmt":"2020-05-27T10:23:01","guid":{"rendered":"http:\/\/alalloycasting.com\/?p=2065"},"modified":"2020-09-03T03:20:25","modified_gmt":"2020-09-03T03:20:25","slug":"fluxes-for-aluminum-alloys","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/fluxes-for-aluminum-alloys\/","title":{"rendered":"Fluxos para ligas de alum\u00ednio"},"content":{"rendered":"

Os fundentes para ligas de alum\u00ednio s\u00e3o geralmente compostos por cloretos e fluoretos de metais alcalinos e alcalino-terrosos, e seus principais componentes s\u00e3o KCl, NaCl, CaF, Na\u2083AlF\u2086, Na\u2082SiF\u2086, etc. As propriedades f\u00edsicas e qu\u00edmicas dos fundentes (ponto de fus\u00e3o, densidade, viscosidade, volatilidade, higroscopicidade e intera\u00e7\u00e3o com \u00f3xidos) desempenham um papel decisivo no efeito de refino.<\/p>\n

Fluxos para ligas de alum\u00ednio<\/h2>\n

O sal de cloreto \u00e9 o componente b\u00e1sico mais comum nos fundentes para ligas de alum\u00ednio, sendo que a mistura de NaCl (45%) e KCl (55%) \u00e9 a mais amplamente utilizada. Isso se deve \u00e0 sua forte capacidade de se infiltrar no Al\u2082O\u2083 s\u00f3lido, nas inclus\u00f5es e na pel\u00edcula de \u00f3xido, al\u00e9m de a densidade do NaCl e do KCl na temperatura de fus\u00e3o ser de apenas 1,55 g\/cm e 1,50 g\/cm, respectivamente, o que \u00e9 significativamente menor do que a do alum\u00ednio fundido. Portanto, Fluxos<\/a> Para ligas de alum\u00ednio, ele se espalha bem na superf\u00edcie do alum\u00ednio fundido, quebrando e adsorvendo a pel\u00edcula de \u00f3xido presente na superf\u00edcie do metal fundido. No entanto, no caso de fundentes que cont\u00eam apenas sais de cloreto, o processo de quebra e adsor\u00e7\u00e3o ocorre lentamente, sendo necess\u00e1rio agitar manualmente para aceler\u00e1-lo. O cloreto possui baixa tens\u00e3o superficial e boa umectabilidade, sendo adequado como agente de cobertura.<\/p>\n

Uma pequena quantidade de sais de fl\u00faor, como NaF, Na\u2083AlF\u2086 e CaF\u2082, \u00e9 adicionada \u00e0 mistura de sais de cloreto, principalmente para fins de refinamento. O fluxo de sais de fl\u00faor tamb\u00e9m pode remover com efic\u00e1cia a pel\u00edcula de \u00f3xido da superf\u00edcie da massa fundida e melhorar o efeito de desgaseifica\u00e7\u00e3o.<\/p>\n

(1) O fl\u00faor pode reagir quimicamente com o alum\u00ednio fundido, produzindo gases como AlF, SiF\u2084, BF\u2083, etc. Esses gases promovem a separa\u00e7\u00e3o da pel\u00edcula de \u00f3xido do alum\u00ednio fundido e comprimem a pel\u00edcula de \u00f3xido.<\/p>\n

(2) A corrente gerada na interface onde ocorre a rea\u00e7\u00e3o acima tamb\u00e9m faz com que a pel\u00edcula de \u00f3xido seja \u201clavada\u201d e rompida. Portanto, a presen\u00e7a do sal de fl\u00faor acelera significativamente o processo de destrui\u00e7\u00e3o da pel\u00edcula de \u00f3xido na superf\u00edcie do alum\u00ednio fundido, e o hidrog\u00eanio presente na massa fundida pode escapar facilmente.<\/p>\n

(3) O fl\u00faor (especialmente o CaF\u2082) pode aumentar a tens\u00e3o superficial da mistura de sais fundidos, esferoidizar o sal fundido do \u00f3xido adsorvido, facilitar a separa\u00e7\u00e3o da massa fundida e reduzir a perda causada pela esc\u00f3ria retida no alum\u00ednio.<\/p>\n

\"Fluxos<\/p>\n

M\u00e9todo de refino por fluxo<\/h2>\n

O m\u00e9todo de refino por fluxo <\/a>tem um efeito positivo na remo\u00e7\u00e3o de inclus\u00f5es n\u00e3o met\u00e1licas. Al\u00e9m das propriedades f\u00edsicas e qu\u00edmicas do fundente, o grau de purifica\u00e7\u00e3o tamb\u00e9m depende, em grande parte, das condi\u00e7\u00f5es do processo de refino. Tais como a quantidade de fundente, o tempo de contato e a \u00e1rea de contato do fundente com o metal fundido, as condi\u00e7\u00f5es de agita\u00e7\u00e3o, a temperatura, etc.<\/p>\n

Na fundi\u00e7\u00e3o de res\u00edduos de ligas de alum\u00ednio, a qualidade dos res\u00edduos varia, e a quantidade de agente de cobertura e de refinamento tamb\u00e9m difere. Ao fundir res\u00edduos de boa qualidade, a quantidade de agente de cobertura e de refinamento \u00e9 relativamente pequena. Ao fundir res\u00edduos de baixa qualidade, a quantidade de agente de cobertura e de refinamento \u00e9 grande. No caso de ligas de alum\u00ednio com alto teor de magn\u00e9sio, elas devem ser cobertas com fundentes sem sal de s\u00f3dio para evitar o contato com fundentes que contenham s\u00f3dio. Os agentes de refino sem s\u00f3dio s\u00e3o utilizados principalmente para lingotes planos de ligas com alto teor de magn\u00e9sio, como as 5052 e 5754.<\/p>\n

O m\u00e9todo de refino com fundente \u00e9 amplamente utilizado na produ\u00e7\u00e3o de ligas de alum\u00ednio por fundi\u00e7\u00e3o. A liga de alum\u00ednio fundida \u00e9 refinada no forno; o fundente \u00e9 carregado no tanque de refino; o tubo de refino \u00e9 utilizado como ve\u00edculo por meio do sopro de g\u00e1s inerte, entrando continuamente no alum\u00ednio l\u00edquido, e o fundente e a liga fundida s\u00e3o totalmente misturados. A agita\u00e7\u00e3o permite atingir o objetivo do refinamento. Quanto maior a intensidade da agita\u00e7\u00e3o e quanto mais uniforme for a pulveriza\u00e7\u00e3o do p\u00f3, melhor ser\u00e1 o efeito de refinamento. No entanto, \u00e9 importante observar que a flutua\u00e7\u00e3o do alum\u00ednio l\u00edquido n\u00e3o pode ser muito grande. Caso contr\u00e1rio, isso levar\u00e1 \u00e0 forma\u00e7\u00e3o de uma nova camada de \u00f3xido.<\/p>","protected":false},"excerpt":{"rendered":"

Fluxes for aluminum alloys are generally composed of chlorides and fluorides of alkali metals and alkaline earth metals, and their main components are KCl, NaCl,…<\/p>","protected":false},"author":1,"featured_media":4444,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120,138],"tags":[4359,643,4335,4504,649,122,1708,4290,743,237,4342,4353,135,835,832,2218,4505,240,245,742,144,244],"class_list":["post-2065","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fluxes","category-seo","tag-adtech-fluxes","tag-alu-granulated-flux","tag-aluminium-casting-flux","tag-aluminium-casting-refining-flux","tag-aluminium-granulated-flux","tag-aluminum-casting-flux","tag-aluminum-casting-foundry-flux","tag-aluminum-degassing-flux","tag-aluminum-drossing-flux","tag-aluminum-refining-flux","tag-casting-flux","tag-drossing-flux","tag-drossing-flux-for-aluminum","tag-flux-degassing","tag-flux-for-aluminum-melt","tag-flux-for-aluminum-melting","tag-flux-for-aluminum-refining","tag-flux-refining","tag-flux-refining-for-aluminum-alloys","tag-flux-refining-process","tag-flux-used-in-metallurgy","tag-fluxes-for-aluminum-alloys"],"yoast_head":"\nFluxes for Aluminum Alloys - sales@alalloycasting.com<\/title>\n<meta name=\"description\" content=\"Fluxes for aluminum alloys are composed of chlorides and fluorides of alkaline earth metals. 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