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-----Watt's Matte Nickel Is Suddenly Bright
Q. Hello,
We operate a typical watt's nickel bath for our matte nickel plating. However, our parts have suddenly come out extremely shiny, looking like it had come out of a bright nickel bath, and we cannot figure out what the cause may be.
The parts in question are small, carbon steel, and barrel plated. We ran the parts at the same time, # of parts, and amperage as usual, and the bath operates at 150 F. Nickel plating thickness is normal after plating, and no other observed problems with plating quality except being unusually bright and shiny. The bath is continuously filtered using a carbon filter. The issue is reproducible when we use the same parts and bath.
The hull cell of the bath looks normal to me (matte). I tried titrating a sample of the bath with potassium permanganate to determine if there is significant organic contamination, but there was not.
Any advice on what the possible cause and how to fix would be appreciated.
- Illinois
December 4, 2025
A. Hi Kevin,
I suppose it's vaguely possible that some cobalt or other metallic contamination is causing finer grain and making the nickel brighter. Assuming that you're using the same solution in your Hull Cell, I would expect the same brightness though.
Also vaguely possible that a rectifier glitch is causing some sort of pulse currents that are bringing on the brightness, which is why you don't see it in the Hull Cell. It would be a big job, but batch carbon filtration would be the way to eliminate that.
Luck & Regards,
Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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Q. I wanted to attach some photos for reference.
The hull cell for the Watt's nickel bath at 1 amp and 5 minutes looks matte. We ran some dummy parts in the same bath and they turned out bright. The surface roughness on the dummy parts comes from the surface texture of the parts themselves, and the plating comes out smooth (but still bright) on actual process parts.
We still haven't figured out why the issue is happening, if the photos offer any additional insight, please let me know.
- Illinois
December 8, 2025
A. The watts nickel is suddenly bright ,Run the Hull cell panel to duplicate your problem, run the dummy with lower amps at least 3-5 hrs in your nickel bath or more & run hull cell panel again after dummy the nickel bath. carbon treat nickel bath.
Popatbhai B. Patel
electroplating consultant - Roseville, Michigan
January 4, 2026
? Hi Kevin -- were you able to resolve the brightener issue in your Watts nickel bath?
JRod- Illinois
January 23, 2026
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