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Pit observed after zinc nickel plating

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 25, 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
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
January 2016

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

Kaoushik Murali [returning]
- coimbatore, TN, India
February 5, 2016

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