Bath solution and process for the removal of lead/tim, lead or tin coatings from copper or nickel surfaces
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United States of America Patent
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Apr 24, 1990
Grant Date -
N/A
app pub date -
Nov 10, 1988
filing date -
Nov 11, 1987
priority date (Note) -
Expired
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Abstract
The invention relates to a stripping solution for the removal of lead/tin, lead or tin coatings applied to copper or nickel surfaces. The caustic solution consists of nitric acid and contains one or several inhibitor(s) such as block copolymers of propylene oxide and ethylene oxide, or polyethylene glycols, and/or polyols with a molecular weight in excess of 2000.
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