| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a plating liquid composition, when hard gold is spot-plated on a nickel-coating substrate such as an electric connector, which inhibits the displacement plating of gold on the part other than the plated part. <P>SOLUTION: The composition includes a gold ion source, a metal ion source including a cobalt salt or a nickel salt, and mercaptotetrazole shown by formula I or the salt thereof (wherein R<SB>1</SB>denotes hydrogen, 1C-20C hydrocarbon group, 8C-20C aralkyl, phenyl, naphthyl, amine or a carboxyl group; and X denotes hydrogen, 1C-2C alkyl or an alkali metal such as calcium, ammonium or quaternary amine, being suitable counter ions). <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
