COMPOSITION AND METHOD FOR STRIPPING SOLDER AND TIN FROM PRINTED CIRCUIT BOARDS

摘要

A composition and method for stripping tin and solder and the underlying tin -copper alloy from the copper substrate of a printed circuit board is presented. The liquid includes an aqueous solution of nitric acid in an amount sufficient to dissolve solder a nd tin, a source of ferric ions in an amount sufficient to dissolve the tin-copper alloy, and a source of halide ions in an amount sufficient to significantly improve the resistance between prin ted circuits.