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In order to evaluate the friction and wear properties of chromium molybdenum films electroplated under different plating speed at elevated temperatures, the films were electroplated under high and normal current densities. The interval of the cracks introduced in the film was decreased by electroplating under high current density. The friction and wear properties of the films were evaluated using a high temperature pin-on-disc type friction and wear testing machine. The results showed that the friction coefficient of the films indicating about 0.2-0.6 at the beginning of the wear test increased with increasing the number of rotation cycles and reached a stable value after reaching the maximum values. The friction coefficient at elevated temperatures was reduced by high-speed electroplating, especially at a temperature of 473K. It was also clarified that the wear sectional area and the wear loss of the pin was decreased by high-speed electroplating. Detailed observation showed that the wear debris consist of oxide of the pin and flake-like delamination of the film produced by repeating sliding during friction and wear test, and change of friction coefficient had close relationship with the formation of the wear products.

Evaluation of Friction and Wear Properties of CrMo Film Deposited by High-Speed and Normal Electroplating at Elevated Temperature