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Copper exposed on parts that are supposed to be nickel

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Q. Why our screw item is exposing copper?


Marjorie Rellama
- Rosario cavite, Philippines
February 26, 2024

A. Hi Marjorie.
Apparently there is no nickel plating in that area. Give us some information and we can try to help.
Luck & Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
Striving to live Aloha - Pine Beach, New Jersey

⇩ Closely related postings, oldest first ⇩

Q. I'm handling copper nickel barrel line my prevailing rejection is copper exposure. Our base metal is iron and will be plated with copper and nickel but after plating their are visible expose copper with scratch. anyone here who can give an advise to improve our plating process.

Redford Olan
Plating - Phil.

simultaneous replies

A. Hi Redford,
You didn't mention the configuration of the part. Do they have sharp edges where scratching could occur? If so, some things to try would be:
1) Tumble de-burr with appropriate media prior to loading the barrel.
2) Using a media in the barrel (BB shot for one example).
3) Slowing down the barrel speed.
3) Adjusting barrel load capacity if needed.
4) Make sure dangler tips are in good shape (no roughness).
5) Check Ni plated thickness, make sure it's adequate.

Mark Baker
process engineer - Malone, New York

A. You don't mention what kind of baths you are using, but copper plating of iron based substrates is carried out in alkaline baths (either cyanide or non-cyanide) which have much better throwing power than most (?) nickel baths. Yours could be a problem associated with part geometry and insufficient current and time for nickel to cover up recessed areas that copper did cover. Or a problem of high copper contamination in your nickel. Under certain conditions and enough level, copper present in a nickel bath will be expelled preferentially.

Guillermo Marrufo
Monterrey, NL, Mexico

A. It sounds to me like your contaminants may be a little high in your nickel bath.

Have you tried dummying you nickel bath?

Brad Standifer
Barrel line/ Rack line operator - Knoxville, Tennessee, U.S.

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