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Chrome Layer Only is Peeling from Nickel-Chrome Plated Brass




March 18, 2014

Q. I make faucet and plumbing fixtures. 59560

Plating procedure : Brass material - Bright Nickel - Chrome (Automatic Equipment)

One of our electroplating parts has a problem.
Chrome plating layer only has peeled.
There was no peeling with bright nickel.

I've experienced a peeling of bright nickel before, but chrome layer peeling have never occurred before. How can it have occurred?

Thanks.

Steve Lim
- South Korea


March 19, 2014

A. If the nickel becomes passivated, then poor chromium coverage or peeling way occur. The cause of nickel passivation may be too long a time between nickel and chromium plating.

Or, the problem may be that the pre-dip before chromium plating is too weak.

Lyle Kirman
- Cleveland, Ohio USA


March 24, 2014

thumbs up signThanks for your kind answer.

I agree with your answer. But I couldn't reproduce same kind of trouble, so I couldn't answer to my customer.

So I did some trick. After Ni plating, I dipped parts in Ni solution tank with no current for three hours. And I re-electroplated Ni on it, then Cr plating.

I could get same trouble on the part. Wow!! It was obviously caused by Ni layer passivation. But I think passivated Ni layer could be activated by Cr pre-dippings. So I hidden passivated Ni layer between Ni layer and succeeded.

Thank you, again!!

Steve Lim
- Incheon City, South Korea


Hi Steve. Very interesting trouble shooting, thank you. Although it looked like a chrome plating problem, apparently it was actually a nickel plating problem.

Regards,

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Ted is available for instant help
or longer-term assistance.
March 24, 2014


I'm glad that you solved your problem.
LK

Lyle Kirman
consultant - Cleveland Heights, Ohio
March 25, 2014




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