Cailiao Baohu (May 2023)

Preparation and Performance Research of Ni-SiC-WS<sub>2</sub> Composite Coatings on Aluminum Surface

  • LU Peng-jun, TIAN Xiao-dong, HAN Bin-long

DOI
https://doi.org/10.16577/j.issn.1001-1560.2023.0110
Journal volume & issue
Vol. 56, no. 5
pp. 83 – 88

Abstract

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In order to investigate the effects of co-deposition of SiC and WS2 particles on the microstructure, wear resistance and corrosion resistance of Ni coatings, the pure Ni coating, the Ni-SiC composite coating and Ni-SiC-WS2 composite coating were prepared on the surface of 1060 aluminum. Scanning electron microscopy (SEM), X-ray diffractometer (XRD), energy dispersive spectroscopy (EDS) and microhardness tester, friction and ball disc wear tester and electrochemical workstation were used to detect and analyze the surface and cross section morphology, phase composition, elemental contents and microhardness of the coatings, and the wear resistance and corrosion resistance of the pure Ni, Ni-SiC and Ni-SiC-WS2 composite coatings were compared. Results showed that the Ni-SiC-WS2 composite coating was flat and compact, with a mass fraction of 7.05% (mass fraction, the same below) and 2.53% for SiC and WS2, respectively. This resulted in the reduction of nickel grain size by 63.39% and 21.63%, compared with the pure Ni coating and the Ni-SiC composite coating, respectively. The microhardness of Ni-SiC-WS2 composite coating was up to 424.73 HV0.5 N, which was 57.70% and 20.46% higher than that of the pure Ni coating and the Ni-SiC composite coating, respectively. WS2 particles in the coating had good antifriction effect, which made the friction coefficient of the Ni-SiC-WS2 composite coating further reduced by 17.39% compared to Ni-SiC composite coating, and wear rate reduced by 24.62%. The self-corrosion current density of Ni-SiC-WS2 composite coating was the lowest, at 4.68 μA/cm2, which was reduced by 53.85% and 11.36%, compared with the pure Ni coating and the Ni-SiC composite coating, respectively. The Ni-SiC-WS2 composite coating had higher impedance value of 112 361 Ω·cm2, which demonstrated better corrosion resistance than the Ni coating and the Ni-SiC composite coating.

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