Plated composite material for coinage use - has base roll plated followed by thin electroplating layer

摘要

Composite material for use in stamping coinage consists of a core (1) made of cheap material, coated by roll plating with a layer (2) of high value material followed by a thin layer of electroplated. high value material. Pref. the roll plating layer has a thickness of at least 0.015 mm and that of the electroplating layer is 0.008-0.1, pref. less than 0.05 mm. The core is a deep-drawing steel with a roll plated layer of Cu, brass, bronze or Ag. The electroplated layer is Ni. The core may alternatively be a CuNi alloy. ADVANTAGE - Similar corrosion resistance and coloration is achieved but the expensive electroplating stage is reduced.