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Corrosion between chromate plated copper and zinc plated steel

I have a copper heatsink that has a bright dip chromate on it and I am bolting it to a steel chassis that has a zinc chromate plating on it. I am experiencing corrosion on both parts. What can be causing this and how can I stop it?

Chris Cutaia
manufacturing - Ontario, New York
2005

2005

Hello Chris;

Try painting the heatsink black, or painting the zinc with an aluminium rich paint.

Khozem Vahaanwala
Saify Ind

Bengaluru, Karnataka, India

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