Trivalent chromate conversion coating

Details Trivalent chromate conversion coating Trivalent chromate conversion coating

2006-04-18

2006-04-18

King, Roy (Department: 1742)

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

C148S244000, C148S264000, C148S267000, C106S014050

Reexamination Certificate

active

07029541

ABSTRACT:
In a preferred embodiment of the present invention, a conversion coating composition comprising chromium (III) ions, cobalt (II) ions, and nitric acid is provided. The coating composition is substantially free of chromium (VI) ions and substantially free of an oxidizing agent. The present trivalent chromium based conversion coating provides corrosion protection equal to or greater than most hexavalent chromium conversion coatings.

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