Bath solution and process for the removal of lead/tim, lead or t

Details Bath solution and process for the removal of lead/tim, lead or t Bath solution and process for the removal of lead/tim, lead or t

1988-11-10

1990-04-24

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156664, 252 794, C23F 100, B44C 122, C03C 1500, C03C 2506

Patent

active

049197525

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.

REFERENCES:
patent: 3922229 (1975-11-01), Fishaber et al.
patent: 4297257 (1981-10-01), Elias et al.
patent: 4397753 (1983-08-01), Czaja
patent: 4713144 (1987-12-01), Schiller
Stripping Solution For Tin and Tin Alloys, Chemical Abstracts, Band 99, No. 10, at 5 (Sep. 1983).

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