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Materials 2016, 9(9), 772;

Electrochemical Corrosion Behavior of Ta2N Nanoceramic Coating in Simulated Body Fluid

Department of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, China
School of Mechanical & Electrical Engineering, Wuhan Institute of Technology, 693 Xiongchu Avenue, Wuhan 430073, China
Department of Mechanical Engineering, Southeast University, 2 Si Pai Lou, Nanjing 210096, China
Author to whom correspondence should be addressed.
Academic Editor: Peter J. Uggowitzer
Received: 2 August 2016 / Revised: 1 September 2016 / Accepted: 3 September 2016 / Published: 10 September 2016
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In order to improve the corrosion and wear resistance of biomedical Ti-6Al-4V implants, a Ta2N nanoceramic coating was synthesized on a Ti-6Al-4V substrate by the double glow discharge plasma process. The Ta2N coating, composed of fine nanocrystals, with an average grain size of 12.8 nm, improved the surface hardness of Ti-6Al-4V and showed good contact damage tolerance and good adhesion strength to the substrate. The corrosion resistance of the Ta2N coating in Ringer’s physiological solution at 37 °C was evaluated by different electrochemical techniques: potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), potentiostatic polarization and capacitance measurements (Mott-Schottky approach). The evolution of the surface composition of the passive films at different applied potentials was determined by X-ray photoelectron spectroscopy (XPS). The results indicated that the Ta2N coating showed higher corrosion resistance than both commercially pure Ta and uncoated Ti-6Al-4V in this solution, because of the formed oxide film on the Ta2N coating having a smaller carrier density (Nd) and diffusivity (Do) of point defects. The composition of the surface passive film formed on the Ta2N coating changed with the applied potential. At low applied potentials, the oxidation of the Ta2N coating led to the formation of tantalum oxynitride (TaOxNy) but, subsequently, the tantalum oxynitride (TaOxNy) could be chemically converted to Ta2O5 at higher applied potentials. View Full-Text
Keywords: Ta2N; characterization; mechanical properties; polarization; electrochemical impedance; Mott-Schottky Ta2N; characterization; mechanical properties; polarization; electrochemical impedance; Mott-Schottky

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Cheng, J.; Xu, J.; Liu, L.L.; Jiang, S. Electrochemical Corrosion Behavior of Ta2N Nanoceramic Coating in Simulated Body Fluid. Materials 2016, 9, 772.

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