Patent ID: 6165342
Filing Date: 2000-12-26
Classification: C25D

Abstract:
A cyanide-free electroplating bath for the deposition of gold and gold alloy coatings, comprising0.5 to 30 g/l of gold, by weight of the gold, in the form of a gold complex, said complex being a complex of gold and sulfur-containing compound;0 to 50 g/l of an alloy metal, by weight of the alloy metal, said alloy metal being in the form of a water-soluble compound of an element selected from the group consisting of silver, copper, indium, cadmium, zinc, tin, bismuth, arsenic, antimony and mixtures thereof;1 to 200 g/l of a free sulfur-containing compound; and0 to 200 g/l of a conductive and buffer salt,wherein the gold complex of at least one member selected from the group consisting of a mercaptosulfonic acid or salt thereof, a disulfidesulfonic acid or a salt thereof, and mixtures of these compounds, and the free sulfur-containing compound is at least one member selected from the group consisting of a mercaptosulfonic acid or a salt thereof, a disulfidesulfonic acid or a salt thereof, and mixtures of these compounds.