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"Pit observed after zinc nickel plating"

January 25, 2016

Q. we do Alkaline Zinc nickel plating for carbon steel (EN24). After plating, we observed pit marks in some areas, and there is no pit mark in base metal before plating.
Our chemistry is:
Zinc: 6g/l; Ni: 1.05g/l: NaOH->95g/l.
What could be the reason for this issue?

kaoushik Murali
Plating shop Employee - coimbatore, TN, India
^

January 2016

A. Hi kaoushik. Under low power magnification like a jeweler's loupe, are these pits bright and hemispherical or are they rough/random shaped and dark?

Regards,

Ted Mooney, P.E. RET
Aloha -- an idea worth spreading
finishing.com - Pine Beach, New Jersey
^

February 5, 2016

Q. The pits looks random shaped. Is it because of less brightener in bath?

Kaoushik Murali [returning]
- coimbatore, TN, India
^

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