Abstract
In this study, Ni–SiC composite coatings with improved wear and corrosion resistance were obtained by ultrasonic electrodeposition (UED) method. The microstructure, microhardness, corrosion and abrasion resistance, and sectional composition distribution of the composite coatings were investigated by atomic force microscopy (AFM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), electrochemical workstation, Vickers microhardness testing, and wear testing. AFM and HRTEM results revealed compact surface structure of Ni–SiC composite coating prepared by UED. Mean diameter of Ni crystals was 68.4 nm, whereas that of SiC nanoparticles present within the composite was 26.7 nm. According to XPS data, contents of Si in UED deposited Ni–SiC composite coating were approximately 23.7 at.%, whereas that of Ni was about 46.8 at.%. Ni–SiC composite coating deposited via UED method exhibited largest microhardness (715.7 HV) compared to other coatings, whereas nickel coating had mean microhardness of 485.8 HV. Icorr and Ecorr values of Ni–SiC composite coatings deposited via UED were 1.13 × 10−3 mA/cm2 and −0.311 V, respectively, indicating optimal level of corrosion resistance. Besides, surface morphological analysis of the coating revealed it to be glossy with only minor surface scratches, exhibiting the best wear resistance.
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