Patent ID: 8142639
Filing Date: 2012-03-27
Classification: C25D

Abstract:
1. A method for forming a hard gold plating film by electrolytic plating with high current density comprising: a) providing a gold alloy electrolytic plating solution comprising gold cyanide, a soluble cobalt salt, an inorganic conductive salt component, hexamethylenetetramine and an acid or salt thereof selected from the group consisting of citric acid, tartaric acid, oxalic acid, succinic acid, adipic acid, malic acid, lactic acid, benzoic acid, compounds containing phosphoric acid groups, sulfurous acid, aminotrimethylene phosphonic acid, 1-hydroxyethylidene pentamethylene-1,1-diphosphonic acid, ethylenediamine tetramethylene phosphonic acid and diethylenetriamine pentamethylene phosphonic acid; b) immersing an electronic component in the gold alloy electrolytic plating solution; and c) generating a current density of between 20 and 60 A/dm