What aluminum alloys are recommended for anodizing?

Most aluminum alloys will build aluminum oxide in an anodizing tank, so the answer to this question depends on the anodizing process and the desired result. Copper containing 2000 series are generally the most difficult to anodize and 5000 or 6000 series are the easiest. For architectural applications Southern Aluminum Finishing recommends 5005 aluminum alloy for sheet and 6063 aluminum alloy for extrusion.

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