Bath solution and process for the removal of lead/tin, lead...

Details Bath solution and process for the removal of lead/tin, lead... Bath solution and process for the removal of lead/tin, lead...

C - Chemistry, Metallurgy

23

F

149/14

C23F 1/44 (2006.01) C23F 1/30 (2006.01) H05K 3/06 (2006.01)

Patent

CA 1313611

ABSTRACT OF THE DISCLOSURE The invention relates to a stripping solution for the removal of lead and 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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