Patent ID: 9580783
Date: 2017-02-28
CPC Classifications: C22F,C25D

Claim:
1. An electronic component metal material having low whisker formability and high durability, comprising: a base material; an A layer constituting an outermost surface layer on the base material and being formed of Sn, In or an alloy thereof; a B layer constituting a middle layer provided between the base material and the A layer and being formed of Ag, Au, Pt, Pd, Ru, Rh, Os, Ir or an alloy thereof, and satisfying the following (a) or (b): (a) wherein the outermost surface layer (A layer) has a thickness of 0.002 to 0.2 μm; and the middle layer (B layer) has a thickness larger than 0.3 μm, (b) wherein the outermost surface layer (A layer) has a deposition amount of Sn, In of 1 to 150 μg/cm the middle layer (B layer) has a deposition amount of Ag, Au, Pt, Pd, Ru, Rh, Os, Ir of larger than 330 μg/cm (c) wherein the outermost surface layer (A layer) has a surface arithmetic average height (RA) of 0.1 μm or lower.