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Preparation and Performance Research of Ni-SiC-WS<sub>2</sub> Composite Coatings on Aluminum Surface
oleh: LU Peng-jun, TIAN Xiao-dong, HAN Bin-long
| Format: | Article |
|---|---|
| Diterbitkan: | Editorial Department of Materials Protection 2023-05-01 |
Deskripsi
In order to investigate the effects of co-deposition of SiC and WS<sub>2</sub> particles on the microstructure, wear resistance and corrosion resistance of Ni coatings, the pure Ni coating, the Ni-SiC composite coating and Ni-SiC-WS<sub>2</sub> 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-WS<sub>2</sub> composite coatings were compared. Results showed that the Ni-SiC-WS<sub>2</sub> composite coating was flat and compact, with a mass fraction of 7.05% (mass fraction, the same below) and 2.53% for SiC and WS<sub>2</sub>, 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-WS<sub>2</sub> composite coating was up to 424.73 HV<sub>0.5 N</sub>, which was 57.70% and 20.46% higher than that of the pure Ni coating and the Ni-SiC composite coating, respectively. WS<sub>2</sub> particles in the coating had good antifriction effect, which made the friction coefficient of the Ni-SiC-WS<sub>2</sub> 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-WS<sub>2</sub> composite coating was the lowest, at 4.68 μA/cm<sup>2</sup>, 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-WS<sub>2</sub> composite coating had higher impedance value of 112 361 Ω·cm<sup>2</sup>, which demonstrated better corrosion resistance than the Ni coating and the Ni-SiC composite coating.