A copper alloy sheet with Sn coating layer for a fitting type connection terminal and a fitting type connection terminal

摘要

A copper alloy sheet with a Sn coating layer comprises a base material made of Cu-Ni-Si system copper alloy. Formed on the base material is a Ni coating layer having an average thickness of 0.1 to 0.8 µm. Formed on the Ni coating layer is a Cu-Sn alloy coating layer having an average thickness of 0.4 to 1.0 µm. Formed on the Cu-Sn alloy coating layer is an Sn coating layer having average thickness of 0.1 to 0.8 µm. A material surface is subject to reflow treatment and has arithmetic mean roughness Ra of 0.03 µm or more and less than 0.15 µm in both a direction parallel to the rolling direction and a direction perpendicular to the rolling direction. An exposure rate of the Cu-Sn alloy coating layer to the material surface is 10 to 50%. A fitting type connection terminal requiring low insertion force can be obtained at a low cost.