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topic 7243

Require Formulation of Non Chromate Passivation


Dear sir,

we are manufacturing of pretreatment chemicals like degreasing, derusting, phosphating, passivation.

We came to know that there is non-chromate passivation and hence request us to suggest in making non-chromate passivation which withstands 24 hours of saltspray test without oiling or painting.

Thanking u

regards Sreenivas



By "non chromate" do you mean no hexavalent chromium or no chromium at all? Because a trivalent chromate process can withstand 24 hours.

Because of possible trade secret issues that it would be impractical for us to deal with considering the partial anonymity of the web, we can't put formulations here, but will be happy to include references to published data if anyone can provide it.

Ted Mooney, Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey


Dear Mr. Mooney,

To help out here, I think what Mr. Srinivas is looking for is a substitute for the final sealant after a zinc phosphating line. Anything instead of Hex Chrome.

Khozem Vahaanwala
Khozem Vahaanwala
Saify Ind supporting advertiser
Bangalore, Karnataka, India

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There are some good non chromated sealers for zinc phosphate but they are trade secrets (as Ted already mentioned). Unfortunately you will have to ask your supplier for it.

sara michaeli
sara michaeli signature 
Sara Michaeli
chemical process supplier
Tel-Aviv, Israel

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