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topic 4521



Can anybody help me on detail process, chemical, equipments source for chromium plating in barrel operation for smaller parts? What precautions should be taken for this process over that of conventional Rack operation?

- calcutta, INDIA


Chromium passivates nearly instantly, such that make-and-break contact causes laminar plate. Hexavalent chromium therefore cannot be barrel plated in the conventional sense.

Some special equipment has been offered and used with some success (for example, barrels that rotate at very high speed to keep the parts pressed in place). Some shops have developed procedures that allow them to plate with a very high, but still acceptable reject rate. Some vendors claim that trivalent barrel plating can be successful.

But in all, barrel chromium plating is a touchy process that requires greater than normal skill and experience, and the likelihood of somebody telling you how to do it here is not high.

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


If it were commercially feasible, the equipment and process would be sold by every company that could legally break a patent.

James Watts
- Navarre, Florida



You may consider the plating of bright tin-nickel alloy which has the same corrosion resistance as chromium, a hardness of 650 HV and can be very well plated in barrels.

- France

Ed. note: Readers may want to hear "The Lost Art of Tin-Nickel Plating".


Dear Mr Sen, You can try tin cobalt plating it is a barrel process and finish is very close to chromium plating.

Varun Bhalla
- Delhi,Delhi(INDIA)

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