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Bronze plating.

By Kushner, Arthur S.
Publication: Products Finishing
Date: Monday, September 1 2003

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

the deposit can vary from copper color (2-3% tin) to white (> 20% tin). Many different plating baths have been used for plating bronze, with cyanide and pyrophosphate being the most common.

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

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