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Third metal between aluminum shaft and stainless steel bearing in salt fog

I have a stainless steel bearing holding a rotating aluminum shaft in a salt fog environment. The shaft was anodized but now needs to have a conductive finish, which will cause corrosion at the bearing interface. What would be a good commercial finish or third metal to put on the shaft to significantly slow or prevent corrosion but still permit electrical conductivity on the bearing surface of the shaft? Conductivity required, minimal masking preferred.

John Winkler
Engineer - Tucson, Arizona, USA
2005

Cadmium is fairly compatible with both. If that is too soft, look at a hardened silver. 10K hard gold plating is not terribly expensive and would be a candidate.

James Watts
- Navarre, Florida
2005

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