{"id":3622,"date":"2020-08-12T10:06:51","date_gmt":"2020-08-12T10:06:51","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=3622"},"modified":"2020-08-19T06:35:20","modified_gmt":"2020-08-19T06:35:20","slug":"aluminum-melt-protection","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/aluminum-melt-protection\/","title":{"rendered":"Prote\u00e7\u00e3o contra derretimento de alum\u00ednio"},"content":{"rendered":"<p>Os m\u00e9todos de prote\u00e7\u00e3o do alum\u00ednio fundido incluem duas t\u00e9cnicas: uma consiste em cobrir a superf\u00edcie do metal fundido com um fluxo de cobertura. O outro consiste no uso de uma liga protetora, ou seja, adicionar elementos oxid\u00e1veis \u00e0 liga para formar uma pel\u00edcula densa de \u00f3xido protetor na superf\u00edcie do metal fundido. O ponto de partida desses dois m\u00e9todos \u00e9 estabelecer uma superf\u00edcie inerte, de modo que o g\u00e1s e o metal fundido n\u00e3o interajam ou que a atividade da rea\u00e7\u00e3o qu\u00edmica seja significativamente reduzida, a fim de alcan\u00e7ar o objetivo de proteger o metal fundido de alum\u00ednio.<\/p>\n<p>O primeiro m\u00e9todo \u00e9 aplic\u00e1vel a todas as ligas de alum\u00ednio. Ele n\u00e3o s\u00f3 previne a oxida\u00e7\u00e3o da massa fundida e a absor\u00e7\u00e3o de hidrog\u00eanio, como tamb\u00e9m tem o efeito de remo\u00e7\u00e3o do hidrog\u00eanio. Isso ocorre porque o ponto de fus\u00e3o do <a href=\"http:\/\/www.alalloycasting.com\/pt\/flux-for-aluminum-melt\/\">fluxo de cobertura<\/a> \u00e9 geralmente menor do que a do material fundido, a densidade \u00e9 menor do que a do material fundido e apresenta boa molhabilidade. \u00c9 poss\u00edvel formar uma pel\u00edcula cont\u00ednua de revestimento l\u00edquido na superf\u00edcie da massa fundida para separ\u00e1-la do g\u00e1s do forno. Em geral, o oxig\u00eanio e o vapor de \u00e1gua n\u00e3o reagem, ou raramente reagem, com a massa fundida atrav\u00e9s do revestimento, enquanto os \u00e1tomos de hidrog\u00eanio dissolvidos na massa fundida podem penetrar no revestimento e escapar devido ao seu pequeno raio.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3625\" src=\"http:\/\/alalloycasting.com\/wp-content\/uploads\/2020\/08\/Aluminum-Melt-Protection-1.jpg\" alt=\"Prote\u00e7\u00e3o contra derretimento de alum\u00ednio\" width=\"500\" height=\"400\" srcset=\"https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/08\/Aluminum-Melt-Protection-1.jpg 500w, https:\/\/www.alalloycasting.com\/wp-content\/uploads\/2020\/08\/Aluminum-Melt-Protection-1-300x240.jpg 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/p>\n<p>A superf\u00edcie da liga \u00e9 composta por uma camada solta de \u00f3xido de magn\u00e9sio com um teor superior a 1%. Ela n\u00e3o consegue impedir a rea\u00e7\u00e3o entre o metal e o g\u00e1s. Portanto, al\u00e9m do primeiro m\u00e9todo de prote\u00e7\u00e3o, tamb\u00e9m \u00e9 adotado o m\u00e9todo de liga protetora.<\/p>\n<p>Adiciona-se ber\u00edlio (5-50) \u00d7 10\u207b\u2074 \u00e0 liga para impedir a oxida\u00e7\u00e3o da mesma durante o repouso, a fundi\u00e7\u00e3o e os tratamentos t\u00e9rmicos e a conforma\u00e7\u00e3o a quente subsequentes. Na massa fundida de alum\u00ednio, o ber\u00edlio \u00e9 um material superficialmente ativo. Sua afinidade pelo oxig\u00eanio \u00e9 maior do que a do alum\u00ednio, mas seu raio i\u00f4nico \u00e9 menor do que o do alum\u00ednio e do magn\u00e9sio. O ber\u00edlio se difunde preferencialmente para a superf\u00edcie da massa fundida ou preenche as rupturas da pel\u00edcula de MgO e se oxida. O \u00f3xido de ber\u00edlio, com \u03b2 &gt; 1, tamb\u00e9m apresenta caracter\u00edsticas de alta resist\u00eancia, baixa press\u00e3o de decomposi\u00e7\u00e3o e boa estabilidade t\u00e9rmica. Juntamente com o MgO, forma uma pel\u00edcula densa de \u00f3xido de ber\u00edlio-magn\u00e9sio com estrutura de espin\u00e9lio, o que melhora a resist\u00eancia \u00e0 oxida\u00e7\u00e3o da liga e desempenha um papel protetor eficaz. Se o ber\u00edlio n\u00e3o for adicionado \u00e0 liga de alum\u00ednio com alto teor de magn\u00e9sio, \u00e9 dif\u00edcil controlar o teor de magn\u00e9sio na quase-liga durante o processo de fus\u00e3o e fundi\u00e7\u00e3o.<\/p>","protected":false},"excerpt":{"rendered":"<p>Aluminum melt protection methods include two methods: one is to cover the surface of the melt with covering flux. The other is a protective alloy,&hellip;<\/p>","protected":false},"author":1,"featured_media":3624,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[3334,3344,3357,3358,3369,3370,3371,3373,3372,3360,3367,3361,3366,3365,3364,3362,3363,3368,3356,3336,3340,3339,3341,3338,3343,3342,3346,3337,3345,3347,3350,3349,3352,3355,3353,3348,3351,3354,3335,3359,3333],"class_list":["post-3622","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminum-melt-protection-alcoa-fjardaal","tag-aluminum-melt-protection-alcoa-iceland-aluminium","tag-aluminum-melt-protection-alcoa-iceland-aluminum","tag-aluminum-melt-protection-aluminium-company-in-iceland","tag-aluminum-melt-protection-century-aluminium","tag-aluminum-melt-protection-century-aluminium-goose-creek-sc","tag-aluminum-melt-protection-century-aluminium-india","tag-aluminum-melt-protection-century-aluminium-railings","tag-aluminum-melt-protection-century-aluminium-works","tag-aluminum-melt-protection-century-aluminum","tag-aluminum-melt-protection-century-aluminum-hawesville","tag-aluminum-melt-protection-century-aluminum-jobs","tag-aluminum-melt-protection-century-aluminum-news","tag-aluminum-melt-protection-century-aluminum-robards-ky","tag-aluminum-melt-protection-century-aluminum-sebree","tag-aluminum-melt-protection-century-aluminum-sebree-ky","tag-aluminum-melt-protection-century-aluminum-sebree-llc","tag-aluminum-melt-protection-century-aluminum-ware","tag-aluminum-melt-protection-century-iceland-aluminum","tag-aluminum-melt-protection-iceland-aluminium","tag-aluminum-melt-protection-iceland-aluminium-company","tag-aluminum-melt-protection-iceland-aluminium-exports","tag-aluminum-melt-protection-iceland-aluminium-factory","tag-aluminum-melt-protection-iceland-aluminium-foil","tag-aluminum-melt-protection-iceland-aluminium-industry","tag-aluminum-melt-protection-iceland-aluminium-mine","tag-aluminum-melt-protection-iceland-aluminium-production","tag-aluminum-melt-protection-iceland-aluminium-smelter","tag-aluminum-melt-protection-iceland-aluminium-statistics","tag-aluminum-melt-protection-iceland-aluminum","tag-aluminum-melt-protection-iceland-aluminum-company","tag-aluminum-melt-protection-iceland-aluminum-exports","tag-aluminum-melt-protection-iceland-aluminum-industry","tag-aluminum-melt-protection-iceland-aluminum-plants","tag-aluminum-melt-protection-iceland-aluminum-production","tag-aluminum-melt-protection-iceland-aluminum-smelter","tag-aluminum-melt-protection-iceland-aluminum-smelting-plant","tag-aluminum-melt-protection-iceland-aluminum-tariffs","tag-aluminum-melt-protection-nordic-aluminum-conordural","tag-aluminum-melt-protection-rio-tinto-alcan-aluminium-smelter","tag-aluminum-melt-protection-rio-tinto-alcan-iceland-co-ltd-isal"],"yoast_head":"<!-- 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