ELECTROLESS GOLD PLATING LIQUID REPREPARATION METHOD, ELECTROLESS GOLD PLATING METHOD AND GOLD ION-CONTAINING LIQUID

摘要

PROBLEM TO BE SOLVED: To provide an electroless gold plating repreparation method where, in the case plating is applied using an electroless gold plating liquid with a gold sulfite salt as a gold ion source, the liquid stability of the electroless gold plating liquid can be sufficiently maintained, and also, gold ions can be sufficiently effectively fed to the electroless gold plating liquid without waste.;SOLUTION: The electroless gold plating repreparation method comprises a stage where a gold ion-containing liquid obtained by mixing an alkaline aqueous solution comprising a gold sulfite salt with a pH regulation liquid comprising a sulfite other than a gold sulfite salt and hydrochloric acid or sulfuric acid is added to an electroless gold plating liquid comprising a gold sulfite salt in such a manner that the concentration of the gold ions in the electroless gold plating liquid is held to a prescribed range.;COPYRIGHT: (C)2007,JPO&INPIT