Patent ID: 9576693
Date: 2017-02-21
CPC Classifications: B32B,C22C,C23C,C25D,H01B,H01R,H05K,Y10T

Claim:
1. A metal material for electronic component, having low whisker formability and high durability, comprising: a base material; an A layer constituting a surface layer on the base material and formed of Sn, In or an alloy thereof; and a B layer constituting a middle layer provided between the base material and the A layer and formed of Ag, Au, Pt, Pd, Ru, Rh, Os, Ir or an alloy thereof, wherein the surface layer (A layer) has the following constituents (i) or (ii): (i) a thickness of 0.002 to 0.2 μm, (ii) a deposition amount of Sn, In of 1 to 150 μg/cm 2 ; and the middle layer (B layer) has the following constituents (iii) or (iv): (iii) a thickness of 0.001 to 0.3 μm, (iv) a deposition amount of Ag, Au, Pt, Pd, Ru, Rh, Os, Ir of 1 to 330 μg/cm 2 ; wherein the surface layer (A layer) has a surface arithmetic mean deviation (Ra) of 0.1 μm or lower.