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Zn Fe plating has black patches

We are doing Zn fe alloy plating for one of our part on which we found black patches after 5 months. We are having Sursulf nitriding plant near Zn fe alloy plating bath. Does it give this type of problem.

Mr. Venkat
venkat - Chennai, Tamil nadu, India
2004

2004

Dear Mr Venkat,

The Nitriding plant near your zinc iron bath may pose problems for both processes. However I believe that you may not have all the controls and parameters in place for a sustained black passivation over zinc iron. Look at the process once again.

Khozem Vahaanwala
Saify Ind

Bengaluru, Karnataka, India

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