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  1. millimillenary

    P2 etch creating black "smut" residue on high-silicon aluminum casting alloy

    P2 etch (ferrous sulfate, sulfuric acid, DI water, 160F, 25 minutes) is needed on aluminum at my facility prior to application of a structural primer paint on the aluminum. This is fine on wrought aerospace alloys like 2024, 6061, 7075. Today we tried an alloy similar to an A356 aluminum...

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