Platinum alloy electroplate bath and platinum alloy electroplate manner

摘要

PURPOSE:To form a Pt-W alloy coating film having high corrosion resistance by carrying out alloy coating at a specified current density with a Pt alloy electroplating bath of a specified pH contg. a Pt compd. and tungstic acid. CONSTITUTION:A Pt-W alloy coating film is formed at 0.025-3.0A/dm2 current density with a Pt alloy electroplating bath of pH =3 contg. about 0.5-15g/l Pt compd. such as platinum chloride and about 0.5-30g/l (expressed in terms of W) tungstic acid and/or tungstate. At this time, the W content of the Pt-W alloy coating film is regulated to 3-40%. An amorphous alloy coating film having high corrosion resistance is obtd.