Title:
BRIGHT COPPER-TIN ALLOY PLATING BATH
Document Type and Number:
Japanese Patent JPS5935693
Kind Code:
A
Abstract:
PURPOSE:To provide a titled plating bath which permits copper-tin alloy plating of white-golden colors having gloss, by adding a brightener of sodium thiocyanate and polyethylene-imine and a tone controlling brightener of nickel salt in a copper-tin alloy plating bath. CONSTITUTION:Sodium thiocyanate and polyethylene-imine are added respectively at 20-60g/l, 0.1-0.8ml/l (as 30% soln.) as a brightener to a copper- tin alloy plating bath consisting essentially of copper cyanide, sodium stannate, sodium cyanide and sodium hydroxide, and contg. 0.15-0.25 copper-tin ratio, 8-20g/l free sodium cyanide and 8-18g/l free sodium hydroxide, and further nickel salt such as nickel chloride, nickel sulfate, nickel acetate, nickel potassium cyanide, nickel nitrate or the like are added in varying amts. as a tone controlling brightener, whereby the bright copper-tin alloy plating of the same component compsn. and having white-golden colors is obtd.
Inventors:
IKENO HIROSHIGE
OGAWA KENICHI
OGAWA KENICHI
Application Number:
JP14735682A
Publication Date:
February 27, 1984
Filing Date:
August 24, 1982
Export Citation:
Assignee:
SEIKO INSTR & ELECTRONICS
International Classes:
C25D3/60; (IPC1-7): C25D3/60
Attorney, Agent or Firm:
Keinosuke Hayashi