To be the tin whisker inhibiter, and below production methodological null pH5 of whisker prevention characteristic tin plated

摘要

PROBLEM TO BE SOLVED: To provide tin whisker preventive agent capable of effectively preventing generation of tin whiskers by sufficiently smoothing a surface of tinned work even when the etching quantity is small, and a whisker preventive tinned work using the agent.;SOLUTION: The tin whisker preventive agent is aqueous solution of ≤ pH5 containing a ferrous compound oxidizing agent, preferably, ferric chloride, ferric sulfate and/or ferric nitrate and a nonionic surfactant, preferably, a compound expressed by general formula (1): A[(C₃H₆O)_n(C₂H₄O)_mH]_k, and/or general formula (2): A[(C₂H₄O)_m(C₃H₆O)_nH]_k, and copper ions, where A is a residual group of active hydrogen-containing compound of k-valent, and k is the number of 1 to 4, n is the number of 3-35, and m is the number of 1 to 70.;COPYRIGHT: (C)2005,JPO&NCIPI