Ni–TiO 2 nanocomposite coating with high resistance to corrosion and wear

• Published in: Surface & coatings technology Vol. 204; no. 23; pp. 3804 - 3810
• Main Authors: Baghery, P., Farzam, M., Mousavi, A.B., Hosseini, M.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2010
• Subjects: Corrosion; EIS; Nanocomposite coating; Pin-on-disc tribometer; Potentiodynamic polarization; Wear; Corrosion; Wear; Pin-on-disc tribometer; Nanocomposite coating; Potentiodynamic polarization; EIS
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/j.surfcoat.2010.04.061

Ni–TiO 2 nanocomposite coatings with various contents of TiO 2 nanoparticles were prepared by electrodeposition in a Ni plating bath containing TiO 2 nanoparticles to be codeposited. The influences of the TiO 2 nanoparticle concentration in the plating bath, the current density and the stirring rate on the composition of nanocomposite coatings were investigated. The composition of coatings was studied by using energy dispersive X-ray system (EDX). The wear behavior of the pure Ni and Ni–TiO 2 nanocomposite coatings were evaluated by a pin-on-disc tribometer. The corrosion performance of coatings in 0.5 M NaCl, 1 M NaOH and 1 M HNO 3 as corrosive solutions was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy methods (EIS). The microhardness and wear resistance of the nanocomposite coatings increase with increasing of TiO 2 nanoparticle content in the coating. With increasing of TiO 2 nanoparticle content in the coating, the polarization resistance increases, the corrosion current decreases and the corrosion potential shifts to more positive values.