Effects of Ultrasonic Power on the Performance of Pulse-electrodeposited Ni-ZrO2 Nanocomposite Coating Under Magnetic-Ultrasonic Fields Coupling Action
Abstract: As one of effective means to alleviate the nanoparticles agglomeration, ultrasonic horn was applied to the magnetic field-pulse electrodeposition apparatus, and Ni-ZrO2 nanocomposite coatings were successfully produced under magnetic-ultrasonic fields coupling action. The aim of this study was to investigate the effects of ultrasonic power on the surface morphology, ZrO2 content, microstructure, microhardness, wear resistance and corrosion resistance of Ni-ZrO2 nanocomposite coating. Results showed that ZrO2 content and microhardness in the composite prepared by no-ultrasonic magnetic field-pulse electrodeposition were 6.43wt% and 384HV, respectively. After applying ultrasonic power from 0 W up to 320 W, ZrO2 content and microhardness increased firstly and then decreased. Under ultrasonic power of 240 W, SEM and EDS results indicated that the Ni-ZrO2 composite coating displayed a fine and compact surface structure whereas the ZrO2 content in composite coating was 15.2wt%, and the composite coating displayed the highest microhardness of 494HV than the other coatings. The worn surface morphology was smooth with only a few of grains worn and the Ni-ZrO2 nanocomposite coating showed the best corrosion resistance according to the results of surface morphology and Tafel curves in 4% NaCl solution.
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2020, Vol. 34 
