METHOD OF PRETREATMENT FOR PLATING AND WATER SERVICE INSTRUMENT MADE OF LEAD-CONTAINING COPPER ALLOY

摘要

[PROBLEMS] To provide a method of pretreatment for plating in which lead, etc. dissolved in an etchant are prevented from being electrodeposited (readhering) to a lead-containing copper alloy as a work to be plated without the necessity of adding a chelating agent which forms an insoluble inert compound. [MEANS FOR SOLVING PROBLEMS] A lead-containing copper alloy as a work to be plated is immersed in an alkaline etchant containing no chelating agent which forms an insoluble inert compound. The lead-containing copper alloy in this state is subjected alternately to electrolysis in which the lead-containing copper alloy is used as one of the positive and negative poles and electrolysis in which the lead-containing copper alloy is used as the other pole (PR electrolysis).