Letter 4042

How to black dye aluminum castings. 

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How should an aluminun die casting be anodized in order do dye it black.

I've heard of a pretreatment using hydrofluoric acid with something else that will remove part of the silicion in the surface so you can get a clear coat that can be dyed. Does anyone knows how this works?

Guillermo Luna Compañia Estañadora Nacional, S.A. de C.V. Mexico City, Mexico

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