{"id":6397,"date":"2020-11-13T03:41:40","date_gmt":"2020-11-13T03:41:40","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=6397"},"modified":"2020-11-13T03:41:40","modified_gmt":"2020-11-13T03:41:40","slug":"degassing-of-hydrogen","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/pt\/degassing-of-hydrogen\/","title":{"rendered":"Desgaseifica\u00e7\u00e3o do hidrog\u00eanio"},"content":{"rendered":"

A desgaseifica\u00e7\u00e3o de hidrog\u00eanio em ligas de alum\u00ednio pode utilizar o efeito de adsor\u00e7\u00e3o do agente refinador para remover impurezas oxidadas e gases. Por g\u00e1s inerte entende-se um g\u00e1s que n\u00e3o reage com o alum\u00ednio fundido nem com o hidrog\u00eanio fundido e que n\u00e3o se dissolve no alum\u00ednio fundido; geralmente, refere-se ao nitrog\u00eanio e ao arg\u00f4nio.<\/p>\n

De acordo com o princ\u00edpio de adsor\u00e7\u00e3o de l\u00edquidos e remo\u00e7\u00e3o de esc\u00f3ria em ligas de alum\u00ednio, muitas pequenas bolhas se formam ap\u00f3s a inje\u00e7\u00e3o de nitrog\u00eanio no alum\u00ednio fundido. As bolhas entram em contato com as inclus\u00f5es de \u00f3xido presentes no alum\u00ednio fundido, e essas inclus\u00f5es s\u00e3o adsorvidas na superf\u00edcie das bolhas, flutuando at\u00e9 a superf\u00edcie do alum\u00ednio fundido junto com elas. Os \u00f3xidos que foram levados \u00e0 superf\u00edcie do alum\u00ednio fundido n\u00e3o conseguem se separar automaticamente do oxig\u00eanio e se redissolver no l\u00edquido, permanecendo na superf\u00edcie do alum\u00ednio fundido para serem reunidos e removidos.<\/p>\n

\"Desgaseifica\u00e7\u00e3o<\/p>\n

Como a purga com g\u00e1s inerte ocorre na interface entre as bolhas e o alum\u00ednio fundido, apenas uma quantidade limitada do material fundido pode ser atingida, e o remo\u00e7\u00e3o de esc\u00f3ria<\/a> O efeito do alum\u00ednio fundido \u00e9 limitado. Para melhorar o efeito de purifica\u00e7\u00e3o, quanto mais bolhas forem produzidas pela inje\u00e7\u00e3o do g\u00e1s refinado, quanto menor for o raio das bolhas, quanto mais uniforme for a distribui\u00e7\u00e3o e quanto mais longo for o tempo de inje\u00e7\u00e3o, melhor ser\u00e1 o efeito de desgaseifica\u00e7\u00e3o.<\/p>\n

A desgaseifica\u00e7\u00e3o do hidrog\u00eanio baseia-se no princ\u00edpio da desgaseifica\u00e7\u00e3o por diferen\u00e7a de press\u00e3o parcial. Como existe uma diferen\u00e7a na press\u00e3o parcial de equil\u00edbrio entre a bolha e o alum\u00ednio fundido na bolha de nitrog\u00eanio, o hidrog\u00eanio dissolvido no metal difunde-se continuamente para dentro da bolha. Esse processo n\u00e3o cessar\u00e1 at\u00e9 que a press\u00e3o parcial do hidrog\u00eanio na bolha seja igual \u00e0 press\u00e3o parcial de equil\u00edbrio do hidrog\u00eanio no alum\u00ednio fundido. Depois que as bolhas sobem \u00e0 superf\u00edcie, o hidrog\u00eanio contido nelas tamb\u00e9m se dissipa para a atmosfera. Portanto, tanto as inclus\u00f5es oxidadas quanto o arg\u00f4nio s\u00e3o removidos durante a subida da bolha. A temperatura do g\u00e1s arg\u00f4nio deve ser mantida entre 710 e 720 \u2103 para evitar a forma\u00e7\u00e3o de nitreto de alum\u00ednio a partir da rea\u00e7\u00e3o entre o hidrog\u00eanio e o alum\u00ednio fundido.<\/p>","protected":false},"excerpt":{"rendered":"

Aluminum alloy liquid degassing of hydrogen can use the adsorption effect of refining agent to achieve the effect of removing oxidized impurities and gas. Inert…<\/p>","protected":false},"author":1,"featured_media":6398,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-6397","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nDegassing of Hydrogen - Partial Pressure Difference Degassing<\/title>\n<meta name=\"description\" content=\"Aluminum alloy liquid degassing of hydrogen can use the adsorption effect of refining agent to achieve removing impurities and gas.\" \/>\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\/degassing-of-hydrogen\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Degassing of Hydrogen - Partial 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