Corrosion and wear behaviour of multilayer pulse electrodeposited Ni-Al2O3 nanocomposite coatings assisted with ultrasound

In this study, the Ni-Al2O3 nanocomposite multilayer coatings with six consecutive layers were electrodeposited on the mild steel by pulse electrodeposition with ultrasound agitation from nickel Watts-type bath. The structure and morphology of the etched coatings cross-section were characterized by scanning electron microscopy (SEM). The corrosion behaviour of these coatings was investigated in 1 M H2SO4 solution. All of the coatings showed the active-passive transition and the distinct difference in structure had negative influence on their corrosion resistance. Moreover, the tribological behaviour of these coatings was evaluated by pin-on-disc type. The results showed that wear resistance increased with increase in duty cycle and frequency.