20150137356 | NON-CYANIDE ELECTROLYTIC GOLD PLATING SOLUTION - The present invention provides a non-cyanogen type electrolytic gold plating solution, which can form a plating film capable of maintaining a high hardness even when the plating film is subjected to a heat treatment. A non-cyanogen type electrolytic gold plating solution of the present invention includes: a gold source including an alkaline salt of gold sulfite or ammonium of gold sulfite; and a conductive salt including sulfite and sulfate. The non-cyanogen type electrolytic gold plating solution includes a salt of at least one of iridium, ruthenium, and rhodium in a metal concentration of 1 to 3000 mg/L. Further, the non-cyanogen type electrolytic gold plating solution preferably includes a crystal adjuster. The crystal adjuster is particularly preferably thallium. | 05-21-2015 |