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What is clear chromate conversion?

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About clear chromate conversion What is clear chromate conversion? Is it a plating process or just a cover after applying of zinc plating? Can the clear chromate conversion be applied independently on metal? Thank you.

Jun Chen
Clear chromate conversion - Lombard, IL, USA
2004

Zinc is a very active metal; if left unprotected it will quickly "white rust" and pit. Chromate conversion coatings deter this. It is an immersion reaction that deposits a thin film, a complex mixture of zinc oxides, zinc chromates, and chrome oxides on the surface. Zinc plating is almost always "chromated" unless it is going to be painted or clear-coated. I put "chromated" in quotation marks because not all such topcoat processes these days actually involve hexavalent chromium.

Ted Mooney, P.E.
Striving to live Aloha
(Ted can offer longterm or instant help)
finishing.com - Pine Beach, New Jersey
2004

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