Electrical contact member, plated terminal, terminal-attached electrical wire, and wire harness
There is provided an electrical contact member including: a conductive base material; and an Ag—Sn alloy plated layer formed on the conductive base material, wherein the Ag—Sn alloy plated layer has a first Ag—Sn alloy plated layer having an Sn concentration of 5 to 38 at. % and a Vickers hardness of 100 or more Hv and less than 300 Hv and a second Ag—Sn alloy plated layer having a Vickers hardness higher than that of the first Ag—Sn alloy plated layer in this order from the outermost layer.
1. An electrical contact member comprising:
a conductive base material; and
an Ag—Sn alloy plated layer formed on the conductive base material, wherein
the Ag—Sn alloy plated layer has a first Ag—Sn alloy plated layer having an Sn concentration of 5 to 38 at. % and a Vickers hardness of 100 or more Hv and less than 300 Hv and a second Ag—Sn alloy plated layer having a Vickers hardness higher than that of the first Ag—Sn alloy plated layer in this order from the outermost layer.
2. The electrical contact member according to claim 1 , further comprising an Ni layer or an Ni alloy layer between the conductive base material and the second Ag—Sn alloy plated layer.
3. The electrical contact member according to claim 1 , wherein the contact resistance in the first Ag—Sn alloy plated layer is lower than the contact resistance in the second Ag—Sn alloy plated layer.
4. A plated terminal which is formed of the electrical contact member according to claim 1 .
5. A terminal-attached electrical wire comprising the plated terminal according to claim 4 .
6. A wire harness comprising the terminal-attached electrical wire according to claim 5 .