Method for forming conversion coating on surface of copper or copper alloy.

摘要

A process for the formation of a chemical conversion coating on the surface of copper or a copper alloy comprises contacting the metal surface with an aqueous solution containing an imidazole compound having an alkyl group having 5 to 21 carbon atoms at the 2-position, wherein a substance capable of generating a copper ion or zinc ion is dissolved and contained in the aqueous solution containing the alkylimidazole compound.