Patent ID: 6783690
Filing Date: 2004-08-31
Classification: C23F,H05K

Abstract:
A method for removing plated silver from a printed circuit board comprising circuit traces of a base metal covered, at least in part, by a plated silver deposit, said method comprising the steps of:(a) contacting said printed circuit board with a stripping solution comprising and oxidizing agent, an alkaline pH adjuster, and a silver solubilizing agent; and (b) neutralizing said printed circuit board with a neutralization solution wherein the stripping solution does not contain a source of cyanide ions and wherein the oxidizing agent is selected from the group consisting of sodium permanganate potassium permanganate, sodium chlorite, potassium chlorite, sodium chlorite and potassium chlorite and the solubilizing agent is selected from the group consisting of succinimide and sources of ammonium ions.