Letter 2287

Conductivity of zinc chromate coating

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Hello:

We produce rack mounted audio/video equipment for the broadcast industry. I would like to know which has the best conductivity and to what degree are the differences, between zinc with clear chromate, yellow chromate, and black chromate. Are their any differences in the corrosion resistance of the three. We need the best electrical grounds for EMI.

Thanks
Don

Don Hudson
- Salt lake City, Ut

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Don,

Because the chromating conversion coatings are very thin, they are all conductive. However, clear chromate film has relatively low electric resistance since it is thinner than yellow and black chromate films. On the other hand, yellow and black chromate coatings offer much better corrosion resistance than clear chromate coating.

Ling

Ling Hao
- Grand Rapids, Michigan

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