Q. What is bronze, and how does one bronze plate? N.P.
A. Good question! Bronze is an alloy consisting of copper and tin. Sometimes other metals are added to improve toughness. Bronze can be plated as a decorative finish and is sometimes used as a substitute for nickel. The color of
A typical cyanide plating bath is as follows:
Component Concentration
Sodium stannate 100 g/liter
Sodium cyanide 26 g/liter
Copper cyanide 12 g/liter
Sodium hydroxide 10 g/liter
Sodium cyanide,
free 16 g/liter
Sodium hydroxide,
free 15 g/liter
Operating Conditions
Temperature 140-160F
Current Density 20-50 ASF
A very recent paper discusses decorative bronze plating in detail: N. V. Mandich, Metal Finishing Magazine, June 2003.
ARTHUR S. KUSHNER
Kushner Electroplating School, Sunnyvale, CA
platingclinic@pfonline.com