plating, anodizing, & finishing Q&As since 1989
Plating a Non-Conductive Coating onto Zinc Die-Castings
I am presently hard anodizing machined aluminum parts for insulating reasons, to prevent hipotting between metal components. Space constraints prevent me from applying a plastic insulator. I looking to die-cast my parts in zinc and am researching the possibilities of a coating for zinc which could act as an insulator.Stephen Glaser
Telect Inc - Liberty Lake, Washington USA
You probably know this, Mr. Glaser, but your parts could be die-cast in aluminum and you could continue to use the anodized coating as an insulator.
There are no non-conductive electroplatings just due to the way electroplating of metals works. You might be able to electrolytically apply an electrophoretic paint of some sort, but I doubt that it would have robust insulating qualities.
You might want to investigate anodizing of zinc. This is a more exotic technology than anodizing of aluminum because it requires rectifiers which can deliver 100-200 volts, which most plating/anodizing shops don't have and don't want due to the electrocution hazard because most shops use exposed bus bars.
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
I have heard of a non conductive coating that is called Whycoat; the company that supplies the Whycoat finish is Whyco Technologies in Thomaston CT. Check them outBrian Lucas
- Wolcott, CT USA
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