科研之友
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摘要
The nano Ni-Cr/SiC composite coatings were prepared using a pulse electrodeposition method from trivalent chromium baths containing compound carboxylate-urea system and nano SiC in ultrasonic field. The effects of the pulse electrodeposition and ultrasonic parameters on the SiC and Cr contents and thickness of the composite coatings were investigated, and the electrochemical behavior of the electrodeposition nano Ni-Cr/SiC coatings in ultrasonic field was measured by electrochemical methods. Results indicate that the SiC and Cr contents and thickness of the Ni-Cr /SiC composite coatings could be significantly improved by the increasing of the electrodeposition rate of matrix Ni-Cr alloy using this technique. The surface morphology, phase composition and chemical composition of the as-posited coating was characterized by the scanning electron micrographs (SEM), X-ray diffraction and energy dispersive spectrum (EDS) analysis, respectively. The result show the Ni-Cr/SiC composite coatings of 21.2 mu m thickness with 3.8 wt% SiC and 24.68 wt% Cr can be obtained in this study. In addition, according to the results of the measurement of mass loss and the typical potentiodynamic polarization curves, the properties such as anti-wear and corrosion resistance could be improved by the increasing of SiC content in the Ni-Cr/SiC composite coatings.
