Patent ID: 7972655

Claim:
A method for enhancing the corrosion resistance of a surface of a copper or copper alloy substrate, the method comprising: depositing a metallic surface layer comprising a precious metal on the surface of the copper or copper alloy substrate; and exposing the copper or copper alloy substrate having the metallic surface layer thereon to an aqueous composition comprising (a) a first organic molecule comprising at least one functional group that interacts with and protects precious metal surfaces, said first molecule being elected from the group consisting of thiols (mercaptans), disulfides, thioethers, thioaldehydes, thioketones, and combinations thereof, (b) a second organic molecule comprising at least one functional group that interacts with and protects copper surfaces, said second molecule being elected from the group consisting of primary amines, secondary amines, tertiary amines, aromatic heterocycles comprising nitrogen, and combinations thereof and (c) a surfactant.