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Ted Mooney, P.E. RET
Pine Beach, NJ

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Peel Off Problem from Bright Cobalt Plating

A Bright Cobalt is plated on copper using a cobalt chloride bath. However, the plating is peel off after salty test or ammonia ⇦ this on eBay or Amazon [affil links] test. Is it because of the high internal stress? If yes, any additive can be used to reduce the internal stress.

Deville Yiu
Hong Kong, China
2000

That could be. Yes, there are many additives that will reduce stress in cobalt plating. In nickel plating, high chloride has been associated with higher tensile stress of the deposit.

Tom Pullizzi
Falls Township, Pennsylvania
2000

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