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"Stripping copper foil from Cr-Ni film"
August 13, 2018
Q. We electrodeposit Cr-Ni films on Cu foil. What are the possible solutions and conditions to strip Cu foil from Cr-Ni film without damaging Cr?Mürşide Haciismailoǧlu
A. Hi Mürşide. I think you are saying that you electroform nickel and then chrome onto a copper foil, but I'm not fully sure. I think you are saying that you then want to separate the nickel-chrome electroform from the copper foil, but I'm not sure when you say "strip" whether you mean you want to mechanically separate the nickel-chrome from the copper or you intend to dissolve the copper foil in some material. Usually you would passivate the copper so the plating/electroforming doesn't stick to it, and then mechanically separate it rather than dissolve it; in fact, such foils are often stainless steel instead of copper. I'm also pretty confident that you've already tried some things so that your answer to the first few suggestions will be "we already tried that" :-)
Please tell us what you are actually doing -- why you are doing this nickel and chrome plating … what you will do with the electroform … why you form it on copper instead of some more easily soluble substrate if you actually wish to dissolve the substrate … and what you have tried and why it wasn't satisfactory. Is the entire copper foil nickel and chrome plated, or just selective areas? It's very difficult to make useful suggestions when the questions are vague and abstract, but relatively easy to make them when the situation is completely understood.
But again my first thought is that you probably should be passivating the substrate foil for easy mechanical removal. Thanks.
Ted Mooney, P.E. RET
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