Patent ID: 8821708

Claim:
A method of surface treatment for the inhibition of contact pressure-induced whiskers comprising depositing one or two or more of metals selected from Mn, Fe, Os, Co, Ni, Au, Zn, Cd, Ga, In, Tl, Ge, Pb, and Sb on a Sn or Sn alloy, wherein the one or two or more metals are deposited on the Sn or Sn alloy coating in the form of a sea-islands structure, the sea is the Sn or Sn alloy coating and the islands are the deposited metal, and wherein the Sn coating or Sn alloy coating is not fully covered with the deposition metal but a part of a surface of the Sn coating or Sn alloy coating is exposed, an average thickness of the deposited metal is 0.01-0.5 μm, and an occupying ratio of said metal on the surface of said Sn or Sn alloy coating depositing said metal thereon is 0.02 to 15, wherein contact pressure-induced whiskers are inhibited from being generated on said Sn or Sn alloy coating.