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Ted Mooney, P.E. RET
Pine Beach, NJ
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for Metal Finishing since 1989
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Trivalent Zn Black Peels off
October 16, 2008
I have been using finishing.com from 1999 to successfully resolve work place issues. and I thank all the resourceful professionals who helped me out.
Coming to the problem in hand,
I am using a subcontractor to do trivalent zn black passivation on M3 Screws and I have come across peeling off problem. this happens if I rub the parts by hand or use a tool to tighten the part.
1. I want to Isolate if the peeling off is limited to Passivation or includes plating
2. How to resolve the issue
Please help
Customer of plating shops - Chennai, Tamilnadu, India
Dear Mr Muralidharan,
please post the picture of the defective screw and oblige.
warm regards,
Khozem Vahaanwala
Saify Ind
Bengaluru, Karnataka, India
October 21, 2008
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