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Zinc chromate

I am director production in galvanized pipe manufacturing company. We are facing one problem after galvanizing. After galvanizing some time we see white rust on the pipe which is rather zinc oxide. I learnt on internet that we may have "zinc chromate" after galvanizing if you can tell me from where I can get this powder and what is process for this zinc chromating is?

Mian Shafqat Ali
Ramna - Lahore
2002

Hello, Mr. Ali. Galvanized items that will be painted are usually not chromated. But if they are not to be painted, they sometimes require dipping in a chromate conversion coating to retard white rusting. Traditionally this has been a weak (about 1/2 percent to 2 percent) chromic acid solution with other chemicals as accelerators and stabilizers. I think that companies like Chemetall-Oakite, EPI / Electrochemical Products Inc. [a finishing.com supporting advertiser], and Heatbath could offer chromating processes for your situation.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2002

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