Abstract
The circulation wear rates of pure nickel, cupronickel and nickel-plated steel coins were measured. The relative wear rates of nickel and cupronickel coins were compared with those reported in earlier studies and circulation wear data for nickel were used as a reference in laboratory wear tests. A correlation between circulation wear rates and laboratory wear rates formed the basis for a prediction of service life. The surfaces of nickel and nickelbonded steel (N-B-S (registered trademark of Sherritt Gordon Mines Ltd.)) coins were observed to harden both in circulation and in laboratory tests. It was also observed that the laboratory wear rate of N-B-S coins increased as the nickel cladding thickness increased and this effect was attributed to differences in surface hardness.
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