Synergy between corrosion and wear of electrodeposited Ni–P coating in NaCl solution

An immersion block-on-ring tester was employed in this study to investigate the interaction between wear and corrosion of electroplated Ni–P coating in 5% NaCl solution. The weight loss and the coefficient of friction of the specimen under different bath temperatures and overpotentials were measured. The results showed that at temperature of 50 °C and overpotential of +600 mVSCE, which was within the transpassive region of its polarization curve, a severe synergy between corrosion and wear was observed. However, at lower temperatures and overpotentials, the interaction between wear and corrosion was hardly noticed.

► Synergistic wear and corrosion of Ni-P electrodeposits in 5% NaCl solution were studied. ► Overpotential and bath temperature influence the tribocorrosion of Ni-P electrodeposits. ► Tribocorrosion of Ni-P electrodeposits is related to the corrosion film and pitting behavior.