{"id":10591,"date":"2021-10-14T02:49:52","date_gmt":"2021-10-14T02:49:52","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=10591"},"modified":"2021-10-14T02:49:52","modified_gmt":"2021-10-14T02:49:52","slug":"molten-metal-degassing-refining","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/es\/molten-metal-degassing-refining\/","title":{"rendered":"Desgasificaci\u00f3n y refinado de metal fundido"},"content":{"rendered":"

Seg\u00fan los distintos mecanismos de desgasificaci\u00f3n, el m\u00e9todo de refinado por desgasificaci\u00f3n del metal fundido de las aleaciones de aluminio puede clasificarse en desgasificaci\u00f3n por diferencia de presi\u00f3n parcial, desgasificaci\u00f3n compuesta, desgasificaci\u00f3n electrol\u00edtica, etc.<\/p>\n

El m\u00e9todo de refinado por desgasificaci\u00f3n del metal fundido mediante diferencia de presi\u00f3n parcial consiste en colocar el metal con gas disuelto en un vac\u00edo con una presi\u00f3n parcial de hidr\u00f3geno reducida, o en introducir un gas inerte en la masa fundida para proporcionar la fuerza motriz necesaria para la deshidrogenaci\u00f3n. En la producci\u00f3n industrial, lo habitual es introducir N\u2082, Ar y otros gases inertes en el metal fundido, o bien inyectar fundente generador de gas en el metal fundido. Dado que en el interior de la burbuja no hay hidr\u00f3geno en absoluto \u2014es decir, la presi\u00f3n parcial del hidr\u00f3geno es cero\u2014, la presi\u00f3n parcial del hidr\u00f3geno en el metal fundido que rodea la burbuja es mayor o igual a cero. Bajo el efecto de la diferencia de presi\u00f3n parcial de hidr\u00f3geno entre el interior y el exterior de la burbuja, los \u00e1tomos de hidr\u00f3geno disueltos se difunden hacia la interfaz entre el material fundido y la burbuja, donde se recombinan en mol\u00e9culas de hidr\u00f3geno dentro de la burbuja; a continuaci\u00f3n, las mol\u00e9culas de hidr\u00f3geno flotan junto con la burbuja hasta la superficie del material fundido y se escapan. Este proceso continuar\u00e1 hasta que la presi\u00f3n parcial del hidr\u00f3geno dentro y fuera de la burbuja sea igual.<\/p>\n

\"Proceso<\/p>\n

El m\u00e9todo de refinado por desgasificaci\u00f3n de metales fundidos mediante compuestos consiste en a\u00f1adir al fundente una sustancia determinada capaz de formar hidruros y nitruros con el gas, como, por ejemplo, la adici\u00f3n de Li, Ca, Ti, Zn y otros metales activos para formar LiH, CaH, TiN, ZnN y otros compuestos para eliminar el gas del metal fundido. Estos compuestos formados tienen baja densidad y son en su mayor\u00eda insolubles en el metal fundido, por lo que se eliminan f\u00e1cilmente mediante la retirada de escoria y el refinado. El hidr\u00f3geno y el ox\u00edgeno disueltos en el metal fundido interact\u00faan en ocasiones para formar vapor de agua neutro, lo que tambi\u00e9n permite lograr el objetivo de la desgasificaci\u00f3n.<\/p>\n

El m\u00e9todo de refinado por desgasificaci\u00f3n electrol\u00edtica del metal fundido utiliza un par de electrodos introducidos en el metal fundido, y la superficie se recubre con flujo de recubrimiento<\/a>. O bien, el metal fundido se utiliza como uno de los electrodos, el otro se introduce en el fundente y, a continuaci\u00f3n, se aplica corriente continua para la electr\u00f3lisis. Bajo la acci\u00f3n del campo el\u00e9ctrico, el H presente en el metal tiende hacia el \u00e1nodo, neutraliza la carga y se polimeriza formando mol\u00e9culas de hidr\u00f3geno, que luego se escapan. Otros iones negativos del metal liberan cargas en el c\u00e1todo, se agrupan, flotan hacia arriba y permanecen en el fundente, donde se combinan para formar escoria que posteriormente se elimina. La experiencia demuestra que este m\u00e9todo no solo permite eliminar el gas, sino tambi\u00e9n la escoria, y puede utilizarse para el refinado, la desgasificaci\u00f3n y la eliminaci\u00f3n de escoria del aluminio y sus aleaciones.<\/p>","protected":false},"excerpt":{"rendered":"

According to the different degassing mechanisms, the molten metal degassing refining method of aluminum alloy melt can be divided into partial pressure difference degassing, compound…<\/p>","protected":false},"author":1,"featured_media":10592,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[],"class_list":["post-10591","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nMolten Metal Degassing Refining Method for Foundry<\/title>\n<meta name=\"description\" content=\"The molten metal degassing refining method is divided into partial pressure difference degassing, compound degassing, electrolytic degassing.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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