Abstract: 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 Cu6Sn5 as a major proportion and having a compound 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 average thickness of the Sn-based surface layer is 0.2 ?m or more and 0.6 ?m or less; an oil-sump depth Rvk of the Cu—Sn alloy layer is 0.2 ?m 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.

Abstract: Tin-plated copper-alloy material for terminal having: a substrate made of Cu or Cu alloy; an Sn-based surface layer formed on a surface of the substrate; and a Cu—Ni—Sn alloy layer including Ni formed between the Sn-based surface layer and the substrate, in which the Cu—Ni—Sn alloy layer is made of: fine Cu—Ni—Sn alloy particles; and coarse Cu—Ni—Sn alloy particles, an average thickness of the Sn-based surface layer is not less than 0.2 ?m and not more than 0.6 ?m, an area ratio of the Cu—Ni—Sn alloy layer exposed at a surface of the Sn-based surface layer is not less than 10% and not more than 40%, and a coefficient of kinetic friction of the tin-plated copper-alloy material for terminal is not more than 0.3.

Abstract: 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 Cu6Sn5 as a major proportion and having a compound 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 average thickness of the Sn-based surface layer is 0.2 ?m or more and 0.6 ?m or less; an oil-sump depth Rvk of the Cu—Sn alloy layer is 0.2 ?m 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.

Abstract: Tin-plated copper-alloy material for terminal in which: a CuSn alloy layer/a NiSn alloy layer/a Ni or Ni alloy layer are formed between a Sn-based surface layer and a substrate made of Cu or Cu alloy; the CuSn alloy layer is a compound-alloy layer containing Cu6Sn5 as a major proportion and a part of Cu in the Cu6Sn5 is displaced by Ni; the NiSn alloy layer is a compound-alloy layer containing Ni3Sn4 as a major proportion and a part of Ni in the Ni3Sn4 is displaced by Cu; an average interval S of point peaks of the CuSn alloy layer is not less than 0.8 ?m and not more than 2.0 ?m; an average thickness of the Sn-based surface layer is not less than 0.2 ?m and not more than 0.6 ?m; an exposed-area rate of the CuSn alloy layer exposed at a surface of the Sn-based surface layer is not less than 1% and not more than 40%; an average of equivalent-circle diameter of the exposed portions of the CuSn alloy layer exposed at the surface of the Sn-based surface layer is not less than 0.1 ?m and not more than 1.