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topic 790

Coating Problem In Chrome


Dear Readers,

We are using Atotech's CR 843 chrome salt for plating chrome over pen parts after satin nickel. Of late we have observed that despite recommendation from Atotech to keep sulphate to chromic Acid ratio of 200:1, we face the problem of chromic acid getting coated on the surface. When we increase the sulphate content the burning of the parts starts. The Hull cell panel shows a throw of 80 mm. The temp. of the bath is 40 °C.

Can somebody throw more light on this.

- India

Since this problem has developed "of late", I would suspect some kind of contamination problem--most likely iron, trivalent chromium, or chlorides. Technical service should be available for this proprietary bath; but a chrome plating consultant can help if the location is remote and the supplier truly can't.

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

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