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Black Zinc Plating or Zinc Plating with Black Chromate?

Black Zinc Plating or Zinc Plating with Black Chromate?

Black Zinc Plating or Zinc Plating with Black Chromate?

(OP)
Is there a difference?  Sometimes I see callouts for Black Zinc Plating, sometimes I see Zinc Plating with Black Chromate.  What are the differences?...if any.

RE: Black Zinc Plating or Zinc Plating with Black Chromate?

Where I come from there is no difference.  The process involves converting the outer layers of zinc to a hexavalent/trivalent chromate and applying a dye or silver nitrate.  Black is one of several colours available including clear silver, gold and olive drab.

Good luck

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