Patent ID: 7922887
Filing Date: 2011-04-12
Classification: C25D

Abstract:
1. A method for producing a metal structure comprising a substrate and a metal body formed on the substrate; comprising the steps of: providing a substrate, at least an upper surface of which comprises an electrical conductor with an area having irregularities and an area not having the irregularities, wherein the area having irregularities has an arithmetic average roughness Ra of 0.05-2.0 μm defined by JIS B0601:2001 and has a mean spacing of the profile elements RSm of 0.04-4.0 μm defined by JIS B0601:2001; and forming a metal body on said electrical conductor by electroplating using a plating bath comprising the metal to be plated and a cyanine dye for suppressing a plating reaction, wherein the cyanine dye loses a plating suppressing effect with the progress of the plating reaction and wherein a preferential growth of the metal body is facilitated on the area having irregularities, thereby a ratio of a thickness of the metal body on the area having irregularities to a thickness of the metal body on the area not having the irregularities is 10 or more, and the thickness of the metal body on the area not having the irregularities is 0.55 μm or less.