{"id":2542,"date":"2020-07-03T08:01:06","date_gmt":"2020-07-03T08:01:06","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=2542"},"modified":"2021-08-30T01:39:26","modified_gmt":"2021-08-30T01:39:26","slug":"aluminum-degassing","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/es\/aluminum-degassing\/","title":{"rendered":"Desgasificaci\u00f3n del aluminio"},"content":{"rendered":"

El aluminio fundido es extremadamente reactivo, por lo que, al entrar en contacto con el aire h\u00famedo o con herramientas mojadas, el agua se descompone y libera hidr\u00f3geno en la masa fundida. Las cantidades excesivas de este gas disuelto tienen un efecto perjudicial, ampliamente documentado, sobre las propiedades mec\u00e1nicas de las piezas de fundici\u00f3n de aluminio finales. Lo que tambi\u00e9n es bien sabido por cualquiera que se dedique a la fundici\u00f3n es que el gas disuelto tiene un efecto determinante en la distribuci\u00f3n y la cantidad de porosidad y contracci\u00f3n. Los niveles de hidr\u00f3geno disuelto deben controlarse para minimizar los desechos. Para controlar el gas en el aluminio, los fundidores deben adoptar m\u00e9todos de desgasificaci\u00f3n del aluminio.<\/p>\n

1. Evitar y reducir al m\u00ednimo la introducci\u00f3n de hidr\u00f3geno en la masa fundida.
\n2. Mide y retira el hidr\u00f3geno antes de verterlo.<\/p>\n

M\u00e9todo de desgasificaci\u00f3n del aluminio<\/h2>\n

La desgasificaci\u00f3n del aluminio fundido se lleva a cabo, por lo general, mediante el uso de un gas de purga, que normalmente se introduce en la masa fundida a trav\u00e9s de una unidad de desgasificaci\u00f3n rotativa. Este proceso de desgasificaci\u00f3n est\u00e1 limitado por las leyes termodin\u00e1micas; cuando se introducen burbujas de gas de purga en la masa fundida, estas recogen hidr\u00f3geno a medida que flotan hacia la superficie. La situaci\u00f3n \u00f3ptima es que estas burbujas saturadas de hidr\u00f3geno salgan del ba\u00f1o fundido y reduzcan los niveles de hidr\u00f3geno. En este caso, la eficiencia del proceso es del 100% desde el punto de vista termodin\u00e1mico. Sin embargo, a medida que disminuye el contenido de gas en la masa fundida, tambi\u00e9n lo hace la presi\u00f3n de equilibrio del hidr\u00f3geno en las burbujas, por lo que debe aumentar la cantidad de gas de purga necesaria para eliminar el hidr\u00f3geno restante. AdTech unidad de desgasificaci\u00f3n en l\u00ednea<\/a> Es \u00fatil para la eliminaci\u00f3n de gases; se encuentra situado entre el horno de fundici\u00f3n y la m\u00e1quina de colada.<\/p>\n

\"Desgasificaci\u00f3n<\/p>\n

La desgasificaci\u00f3n suele llevarse a cabo en una de estas tres \u00e1reas de la planta de fundici\u00f3n de metales:<\/p>\n

1. En la cuchara de transferencia, utilizada para transportar el metal entre los hornos de fusi\u00f3n y los de mantenimiento.
\n2. En los hornos de crisol, normalmente justo antes de verter el aluminio fundido.
\n3. En un sistema en l\u00ednea, cuando el metal se transporta a los hornos de espera a trav\u00e9s de una canaleta.<\/p>\n

Medici\u00f3n de gas<\/h2>\n

Existen dos m\u00e9todos principales de an\u00e1lisis de gases: las t\u00e9cnicas de muestreo y los m\u00e9todos in situ. Las t\u00e9cnicas de muestreo pueden dividirse a su vez en dos clases. En la primera, se extrae una muestra l\u00edquida y se introduce directamente en el instrumento de medici\u00f3n antes de que se produzca la solidificaci\u00f3n. En la segunda, se vierte una muestra de l\u00edquido en un molde especialmente dise\u00f1ado y se analiza la muestra s\u00f3lida.<\/p>","protected":false},"excerpt":{"rendered":"

Molten aluminum is extremely reactive, so when it comes in contact with moist air or wet tools, the water decomposes to release hydrogen in the…<\/p>","protected":false},"author":1,"featured_media":5302,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[748,157],"class_list":["post-2542","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-aluminum-degassing-method","tag-molten-aluminum-degassing-unit"],"yoast_head":"\nAluminum Degassing Method,Molten Aluminum Degassing Unit<\/title>\n<meta name=\"description\" content=\"Aluminum degassing can be used for hydrogen removal in metal castings. 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