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topic 60765

Plating on silicon steel fails salt spray test quickly

May 22, 2018

Q. We are plating a sample part which contains %2,5 Si. The plating is Zinc-Nickel with black passivation. Even though the plating looks normal at the end (no bubbles, min. 8 micron, 17% Ni), the parts fail Salt Spray test very quickly. Can Si be the reason?

Maurice Arditti
- Madrid, Spain

June 11, 2018

A. Hi cousin Maurice!

First, I think 17% Ni is a little too high, best corrosion resistance is between 12 and 15% Ni.

Second, please tell us how complicated is the part, the corrosion resistance you need (spec), how is your process (degreasing - immersion + electrolytic? -, pickling, alkaline/acid Zn-Ni...) and, if possible, some photos of finished and failed (corroded at "X" hours) part.

Hope you can solve this! Best of luck!

Daniel Montanes
TEL - N FERRARIS - Canuelas, Buenos Aires, Argentina

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