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Decapado Sánchez Santiago Ángel Di Frenna Gabriel Orozco José Antonio Sánchez Pérez Patricio
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Sintesis Decapado Proceso de preparación superficial, que se lleva a cabo para adecuar la superficie para algún otro proceso. Mecánico Son principalmente
Químico Utiliza soluciones
Electrolítico Se forma utilizando al
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Generalidades
Se llama proceso de decapado, a la operación mediante la cual se eliminan capas de óxidos o compuestos químicos insolubles, localizados en los metales debido a la acción de los gases que rodean su medio ambiente ( oxigeno , Anhídrido carbónico , vapor de agua ).
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Decapado
1.
Objetivo: Es un Tratamiento superficial que
permite eliminar impurezas, ejemplo de estas son las capas de óxidos, manchas, pintura etc. Clasificación: Por el mecanismo en como actúan, el decapado se divide en los siguientes 3 tipos: Decapado Mecánico.
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Decapado Mecánico
Mecanismo: Se lleva a cabo bajo 3 métodos, el
primero realiza bajo el choque de partículas diminutas (Chorro de Granalla) a alta velocidad, el segundo con la utilización de cepillos de alambre que se frotan sobre la superficie a limpiar, el tercero es utilizado en los alambres aplica el principio de la flexión inversa para desprender las capas.
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Decapado Químico
Mecanismo: Se realiza sumergiendo el metal en
un baño ácido (Licor de pasivado) Objetivo: Eliminar el óxido de la superficie metálica y producir un metal brillante o puro, adecuado para las operaciones de acabado, como enchapado o galvanizado. Reactivos: ácido sulfúrico y clorhídrico
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Soluciones Decapantes
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Decapado Electrolítico
Mecanismo: Se realiza colocando el metal en la
varilla catódica en una solución de ácido, a la cual se le hace pasar una determinada densidad de corriente para provocar desprendimiento de Hidrogeno en el
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Decapado Electrolítico en Barcos
Se crea una pila galvánica compuesta por la estructura de acero (Cátodo) y la bobina de aleación de Magnesio (Ánodo) unida
Mecanismo:
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Cuadro Comparativo Mecánico
No utiliza Compuestos químicos No perjudica al medio Ambiente.
Químico
Electrolítico
Utiliza compuestos químicos Buen acabado superficial (liso y
Utiliza compuestos químicos Mejor acabado que con el químico.
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