TIN-PLATED COPPER ALLOY TERMINAL MEMBER WITH OUTSTANDING INSERTION AND REMOVAL CHARACTERISTICS

摘要

Provided is a tin-plated copper alloy terminal member with outstanding insertion and removal characteristics and that demonstrates outstanding electrical connection properties while a coefficient of kinetic friction is reduced to 0.3 or less. The tin-plated copper alloy terminal member comprises a tin-based surface layer formed on a surface of a substrate made of a copper alloy, and a copper-tin alloy layer formed between the tin-based surface layer and the substrate. The copper-tin alloy layer is an alloy layer having Cu6Sn5 as the primary component thereof, with compounds in which part of the copper in the Cu6Sn5 has been substituted with nickel or silicon being present near the interface on the substrate side. The average thickness of the tin-based surface layer is between 0.2 µm and 0.6 µm. The oil retention depth (Rvk) of the copper-tin alloy layer is at least 0.2 µm. The proportion of the area of the copper-tin alloy layer exposed to the surface of the tin-based surface layer is between 10% and 40%. The coefficient of kinetic friction is 0.3 or less.