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Exposing screws to high voltage (35kV) causes red rust

November 26, 2012

Q. Right now the screws which we use in our product are mild steel with zinc and blue pasivation. The issue is when we test our product for high voltage, 35 kV (the voltage is applied on the poly carbonate cover over the screw), we get red rust on the screws within 15 days. Can anybody give the reason and a good suggestion

Rathi Ramasamy
engineering - Tirunelveli, India

A. There could be electrical discharges during testing which puncture the protective zinc coating. This assumes that zinc plating is satisfactory otherwise.

H.R. Prabhakara - Consultant
Bangalore Plasmatek - Bangalore Karnataka India
November 27, 2012

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