Composite copper member

摘要

An object of the present invention is to provide a novel composite copper member. According to the present invention, a composite copper member in which a metal layer made of a metal other than copper is formed on the fine unevenness containing copper and copper oxide on at least a part of the surface of the copper member, wherein the composite copper member on which the metal layer is formed The surface has fine irregularities, the average length (RSm) of the roughness curve elements of the surface of the composite copper member is 550 nm or less, the surface area ratio is 1.3 or more and 2.2 or less, and the average thickness of the metal layer in the vertical direction is 15 nm or more and 150 nm The following composite copper members are provided.