Microstructure and corrosion properties of Ni-TiN nanocoatings prepared by jet pulse electrodeposition

• Published in: Ceramics international 2017-12, Vol.43 (17), p.14623-14628
• Main Authors: Xia, Fafeng, Jia, Wanchun, Jiang, Minzheng, Cui, Wei, Wang, Jeremy
• Format: Article
• Language: English
• Subjects: Corrosion property; Jet pulse electrodeposition; Microstructure; Ni-TiN nanocoating
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2017.07.117

Ni–TiN nanocoatings were successfully prefabricated by jet pulse electrodeposition. The effect of jet rate on cross-sectional composition, microstructure, microhardness, and corrosion properties of nanocoatings was examined by X-ray photoelectron spectroscopy, high-resolution transmission electron microscope, atomic force microscopy, microhardness tester and electrochemical workstation. Results illustrated that Ni–TiN nanocoatings deposited at jet rate of 3m/s exhibited high concentration of Ni and Ti with average concentrations of Ni and Ti of 54.5at% and 19.8at%, respectively. Average diameters of Ni grains and TiN nanoparticles in Ni–TiN nanocoatings prepared at 3m/s were 47.8nm and 30.5nm, respectively. Nanocoatings deposited at 1m/s, 3m/s and 5m/s showed surface root-mean-square roughness value of 95.431, 30.091 and 58.454nm, respectively, and presented maximum microhardness of 789.5, 876.2, and 849.9 HV, respectively. Ni–TiN nanocoating obtained at 3m/s demonstrated minimum Icorr and Ecorr values of 1.02 × 10−3mA/cm2 and − 0.551V, respectively, signifying to offer the best corrosion resistance.