Letter 12090

Zinc nickel on a grey iron substrate ??? 

Anybody knows if it would be possible to apply a zinc nickel coating in a grey iron component, for instance a brake caliper.

Alfonso Bustos Garcia
- Valladolid

The question, I believe, is about the hydrogen overvoltage of the carbon particles in the cast iron. In zinc cyanide and probably alkaline non-cyanide zinc, the overvoltage is low, so hydrogen is reduced on the metal instead of zinc metal.

Practical acid zinc plating solutions solved this problem. So I suppose that an acid zinc-nickel solution would be all right. I don't have a reference for this, so please check in with an answer if you have one.

Tom Pullizzi Platronica.com Falls Township, PA

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