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HELP!! Large items turning copper

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  • HELP!! Large items turning copper

    Hello
    i am electroplating with zinc
    small nuts and bolts zinc fine with a dull grey then I can polish to shine.
    but larger items like brake calipers are mostly a shiny copper like finish. Some of the peak areas did get some zinc. Why is this happening?

    5amps. 7 volts
    5% acidic white distilled vinegar
    epsom salt
    sugar
    muriatic acid bath
    water rinse.


    thanks
    chad
    Last edited by stuppenfeld; 09-05-2020, 10:09 AM.

  • #2

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    • #3
      Wow. What’s the point of having a forum??
      10 views. Nobody has any advice?

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      • #4
        Can you send me some photos of the Solution and set up ?
        --
        Jason Vanderbroek
        315 946 1213 x116
        www.caswellplating.com

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