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Chromate conversion coating on zinc plated steel

Hello: Does adding a chromate conversion coating to a zinc plated steel enclosure will interfere with the enclosure's EMI protection? I am familiar with ASTM B633, but the spec. does not describe the EMI effects of adding a chromate conversion coating. Thank you Matt Wise

Matt Wise
- Germantown, Maryland
1999

I've never heard that it has any effect, and don't think it does.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
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Hi Matt ,

All the people that I know that plate Enclosures for electronic equipment , yellow chromate treat the Zinc Plating and have never had any problems , but for other reasons a lot of them are now switching (no pun intended) to semi - bright Nickel plating

Best regards

John Tenison - Woods
- Victoria Australia
1999

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