Effect of TiO2 nanoparticles on anticorrosion property in amorphous Ni‐P‐Cr composite coating in artificial seawater and microbial environment

Abstract To obtain the composite with a function of corrosion resistance in seawater and microbial environment, we apply low toxic electrolyte which contained Cr 3+ instead of Cr 6+ as a chromium source to produce Ni‐P‐Cr/TiO 2 , Ni‐P‐Cr/ZrO 2 nanocomposite coatings, and Ni‐P‐Cr/TiO 2 microcomposite coating using direct current (DC) electrodeposits technique. The surface morphology, texture, and composition of the composite coatings are characterized by SEM, XRD, and EDX measurements, respectively. The corrosion behavior of the composite coatings is evaluated by polarization curves and electrochemical impedance spectroscopy (EIS). The results with more positive‐shifting E corr , lowest i corr , and relatively high value of polarization resistance ( R p ) proved that compared with other composite coatings, Ni‐P‐Cr/TiO 2 nanocomposite coating with its better passive film and unique antibacterial activity caused by TiO 2 nanoparticles incorporated, displayed excellent antibacterial and corrosion resistance property, consistent to the phenomenon that corrosion of this nanocomposite coating in SRB culture medium is not observed.