To provide a plated silver film which shows an attractive appearance of a silvery white color with luster, by a process of displacement silver plating.
In a bath for displacement silver plating containing a soluble silver salt and a complexing agent formed of a sulfur-containing compound such as a thiourea, a sulfide and a mercaptan, the bath for displacement silver plating further includes at least one phosphoric acid selected from the group consisting of orthophosphoric acid, condensed phosphoric acid and salts thereof, in an amount of 0.5 mol/L or more. Thereby obtained silver film shows the attractive appearance of a silvery white color with luster, because the particular phosphoric acid of a predetermined concentration or higher contained in the bath prevents the silver film from blackening or causing the unevenness of a color tone.
HAGA MASAKI
TANAKA KAORU
| JP2002266077A | 2002-09-18 | |||
| JP2002356783A | 2002-12-13 | |||
| JP2000309875A | 2000-11-07 | |||
| JP2004143588A | 2004-05-20 | |||
| JPH05222574A | 1993-08-31 |
Next Patent: METHOD AND APPARATUS FOR RECYCLING WASTE ALUMINUM