| abstract |
Provided are a tin-plated terminal material having a high corrosion prevention effect and low contact resistance, a terminal made of the terminal material, and a wire end portion structure using the terminal. A zinc layer comprising a base 2 made of copper or copper alloy, a zinc layer 4 formed on the base 2 and made of a zinc alloy, and a tin layer 5 formed on the zinc layer 4 and made of a tin alloy 4 and the tin layer 5 tin weight per unit area in the whole 0.30 mg / cm 2 or more 7.00 mg / cm 2 or less, the amount of zinc per unit area 0.07 mg / cm 2 or more 2.00 mg / cm 2 or less, tin The zinc content in the vicinity of the surface in the layer 5 is 0.2% by mass or more and 10% by mass or less, and the ratio of the length occupied by small angle grain boundaries to the length of all grain boundaries in the tin layer 5 is 2% More than 30%. |