Letter 41055

Powder coating anodized aluminum parts [Montana] 

June 8, 2006

I have thousands of small black anodized aluminum parts that I wish to powder coat w/o first stripping. Is there any problem w/ compatibility or significantly diminished adhesion?

Chuck DeWitt
electronics - Hamilton, MT, USA

There is no 100% answer. You can paint over sulfuric anodized parts in most cases. In a few, dye might cause a problem. there are several paints that do not like chromate sealed or chromic acid anodizing. Seal does not make a lot of difference unless the parts are quite old, then sealing helps. Wait a day after anodizing to paint as your powder coat cure temp might cause a lot of water outgassing. I think that unsealed paints better, but I have read several opinions to the contrary. Best is what works for you.

James Watts
- FL

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