High-temperature tribological properties of Ni-P alloy coatings processed by electro-brush plating on 20CrMo steel have been investigated.A ball-on-disc configuration was employed and 4 mm diameter Si3N4 balls were used as static counterpart.All the wear tests were carried out at 450℃ for 180 min without lubricants.The electro-brush plating Ni-P coating is amorphous in as-deposited condition,and it becomes polycrystalline with the formation of Ni and Ni3P after heat treatment at 450℃ for 1 h.The friction coefficient of the Ni-P coating is just 50％ of that of the 20CrMo steel at the friction temperature of 450℃.A mild adhesive wear mechanism was found for the electro-brash plating Ni-P coating tested at 450℃,whereas for the 20CrMo steel at the same temperature a mixed adhesive and abrasive wear mechanism was observed.
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