To improve coating properties, NiP-WC and NiP coatings have been prepared by ultrasonically assistedelectroless plating and their performance after heat treatment has been studied. The surfacemicromorphologies of the coatings were analyzed, and it was shown that the size of the sphericalmicrostructure of the ultrasonically assisted electroless NiP coating was reduced from 5 ~ 10mm to 2 ~5 mm. In addition, pure NiP and NiP-WC coatings with ultrasonic assistance showed 36% and 75%higher hardness than those without ultrasonic assistance and the hardness of the electroless coating afterheat treatment was higher than that of the original electroless plating coating. The corrosion resistanceof the NiP-WC and NiP electroless plating with ultrasonic assistance showed 18.46% and 52.12% higherRp value than those without ultrasonic assistance. The results show that ultrasonic assistance can increasethe uniformity, hardness, and corrosion resistance of the coating.
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