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Gray dots on semi-bright nickel plated hull cells

Q. Hello all!
I have a important problem with semi-bright nickel hull-cell. On face of a Hull-Cell appear greyish dot after 15 minutes. Bath of nickel consist NiSO4:240g/l, NiCl2:60g/l and H3BO3:45g/l at 55 oC.
Thank you very much.

Giap Thang
student - Viet Nam
April 23, 2009

Hi, Giap. Send a photo of the Hull Cell ⇦ huh? panel if you can (try to get a piece of screening as the reflected image). Meanwhile, remember that a principal function of hull cell testing is to observe what happens at different current densities. So the first thing you should be noting is where these gray dots appear (low current density, mid, or high). Good luck.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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