| 摘要 |
A tin-plated copper-alloy terminal material having an excellent insertion and extraction performance, which has a dynamic friction coefficient of 0.3 or less while displaying excellent electrical connection characteristics, is provided. The tin-plated copper-alloy terminal material includes a Sn-based surface layer formed on a surface of a substrate made of a Cu alloy, and a Cu-Sn alloy layer formed between the Sn-based surface layer and the substrate. The Cu-Sn alloy layer includes Cu6Sn5 as a main component, in which a part of Cu in the Cu6Sn5 is substituted by Ni and Si in the vicinity of a boundary face at the substrate side. An arithmetic average roughness (Ra) of the Cu-Sn alloy layer is 0.3μm or more in at least one direction, an arithmetic average roughness (Ra) in all directions is 1.0μm or less, an oil-sump depth (Rvk) of the Cu-Sn alloy layer is 0.5μm or more, an average thickness of the Sn-based surface layer is 0.4μm or more and 1.0μm or less and dynamic friction coefficient is 0.3 or less. |
