Abstract
CuO nanoparticles prepared by complexation precipitation method at 30 °C were used as precoating materials on a crankshaft (QT500-7) surface. In the ammonia atmosphere, copper/microalloyed gradient coating with a metal-like appearance was obtained via CuO nanoparticles redox reaction and gas nitriding at 530 °C for 3 h and 5 h, respectively. Bonding strength between the Cu coating and microalloyed layer can reach up to 34 N. The treated samples were evaluated under actual working conditions in the factory, which was placed on the bench test machine for wear resistance test (168 h and 500 h). Results indicate that the pores on the copper layer have the functions of oil storage and chip storage, which can improve the lubrication performance. Meanwhile, the copper elements was transferred on the crank (Pair grinding), reducing the wear of crank accidentally. The surface gradient composite layer of the crankshaft has better wear resistance than nitriding treatment. Compared with copper plating, the in-situ growth methods can provide a new way of preparing copper/microalloyed gradient coating without any pollution.
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