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08-01-2003, 03:36 AM
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copychrome
I have some new u-bolt nuts I want to copychrome. They have a black coating on them, I don't know what the coating is. I put them in sulphuric acid and they fizzed a little bit, but there is still a little black on them. I guess my question is, will there be a problem putting them in the copychrome, I don't want to ruin the solution? Of cource the outsides will be polished, but the threads will still have the black. Thanks for any help in advance. lloyd
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08-03-2003, 04:21 PM
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It's probably a black oxide coating. It needs to come off before plating. Use muriatic acid. See http://www.caswellplating.com/bbs/viewtopic.php?t=643
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