Letter 2092

Zinc Dichromate

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Could anyone please tell me what the general process is for "Zinc Dichromate"? It's a ASTM B-633 [link is to spec at TechStreet], SC3, Type II Colored Chromate Conversion Coating as my client stated on the drawing. I'm trying to explain this to my Chinese vendor. It's been a while since I learned this stuff in college. I barely remember this is different from Zinc plating because it's rather a chemical process.

Any help will be greatly appreciated.

Feng, Jack
- LA, CA

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This is zinc plating for service condition 3, followed by a type II chromate conversion coating. The thing to do, Jack, is to get yourself and your Chinese vendor each a copy of ASTM specification B633 by following the hotlink.


Ted Mooney, P.E. 
finishing.com
Brick, New Jersey

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