Patent ID: 7972709

Claim:
A Cu—Zn alloy Sn plating strip superior in thermal peel resistance, that has a Cu—Zn alloy strip that comprises 15 to 40% by mass of Zn and a balance of Cu and unavoidable impurities, wherein the total concentration of P, As, Sb and Bi is 100 ppm by mass or less, the total concentration of Ca and Mg is 100 ppm by mass or less, the concentration of O is 30 ppm by mass or less, and the concentration of S is 30 ppm by mass or less, as a base material, and wherein a plating coating is constructed by layers of an Sn phase, an Sn—Cu alloy phase, and optionally a Cu phase, in that order from the surface to the base material, wherein the thickness of the Sn phase is 0.1 to 1.5 μm, the thickness of the Sn—Cu alloy phase is 0.1 to 1.5 μm, and the thickness of the Cu phase is not more than 0.8 μm.