1 School of Materials Science and Engineering, Liaoning Technical University, Fuxin 123000, China 2 Engineering Services Company of PetroChina Great Wall Drilling Engineering Co., Ltd., Panjin 124010, China
Abstract: In order to investigate the influence of the second-phase (TiC particles) on the microstructure and wear resistance of Ni-based composite coatings, pure Ni coating, Ni-micro TiC composite coating and Ni-nano TiC composite coating were prepared on the Q235 steel by double-pulse electrodeposition, respcetively. The surface morphology, phase structure and composition of the coatings were characterized by FESEM, XRD and EDS, and the surface roughness, microhardness and wear resistance of the coatings were compared, respectively. The results show that after adding TiC particles, the surface morpholgogy of the coating changes from a cellular structure to a cauliflower structure, and the deposition orientation behavior of the nickel matrix also changes. The average grain size of Ni-nano TiC composite coating is 24.9 nm, approximately 1/3 of Ni-micro TiC composite coating. Compared with the Ni-micro TiC composite coating, Ni-nano TiC composite coating has a smaller surface roughness (Ra=3.500 μm) and a higher surface hardness (820.5HV0.1). The results of the abrasion test indicate that the wear mechanism of the composite coating is a mixture of slight abrasive wear and adhesive wear, and the wear rate of the nickel-based coating decreases due to the presence of TiC particles. Among them, the average wear rate of the Ni-nano TiC composite coating is 5.6 mg/(cm2·min), which is about 1/2 of the Ni-micro TiC composite coating, showing better wear resistance to the substrate.
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2020, Vol. 34 
