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

摘要

To provide tin-plated copper-alloy material for terminal having an excellent insertion/extraction performance by reducing dynamic friction coefficient to 0.3 or less with bringing out an excellent electrical-connection characteristic. Tin-plated copper-alloy material for terminal in which: a Sn-based surface layer is formed on a surface of a substrate made of Cu alloy, and a Cu-Sn alloy layer is formed between the Sn-based surface layer and the substrate; the Cu-Sn alloy layer is an alloy layer containing Cu 6 Sn 5 as a major proportion and having a compound in which a part of Cu in the Cu 6 Sn 5 is substituted by Ni and Si in the vicinity of a boundary face at the substrate side; an average thickness of the Sn-based surface layer is 0.2 µm or more and 0.6 µm or less; an oil-sump depth Rvk of the Cu-Sn alloy layer is 0.2 µm or more; an area rate of the Cu-Sn alloy layer exposed at a surface of the Sn-based surface layer is 10% or more and 40% or less; and dynamic friction coefficient is 0.3 or less.