Letter 15059

Galvanic corrosion between anodized Al and chromed steel  

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I am using chrome-plated plain ball bearings inside sealed from moisture aluminum housings. Does hard anodizing help prevent galvanic corrosion between the two? Any other tips for a long-lasting service life?

Bob Piet
- Denver, CO, USA

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Yes, anything that reduces metal to metal contact, or that coats a surface so that it is less free to conduct electricity or less free to participate in ionic reactions will reduce galvanic activity. I do not think I would expect any galvanic activity or corrosion on the balls or races of such a sealed bearing.

 
Ted Mooney, P.E.
finishing.com Inc. - Brick, NJ

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