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Anyone seen this aluminum anodizing defect?

I have a 365-T6 investment cast aluminum part that is type III hard coated black. The surface has been even in the past but came out patchy on the last run. I am looking for causes: heat treatment, Ti-B refinement,flux usage, tramp elements, etc.

Greg Barron
metal caster - Oxford, Michigan USA
November 1, 2008

We need to know the surface preparation, anodizing free acid, dissolved aluminum, temperature, and current density.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

November 5, 2008

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