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stripping smut

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  • mcaswell
    replied
    There are many different alloys of aluminum. They will all react slightly differently to chemicals.

    Our Aluminum De-Oxidizer product de-smuts parts prior to anodizing. See http://www.caswellplating.com/aluminum.htm

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  • johnlindahl
    started a topic stripping smut

    stripping smut

    some alu parts get all black within 30 secs of being immersed in lye while other parts get almost no smut layer at all. Even after sanding and polishing the part some it still gets all dirty when stripping and it's almost impossible to whipe clean.
    What is this and what does it indicate?
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