Next Article in Journal
Study on Stress Development in the Phase Transition Layer of Thermal Barrier Coatings
Previous Article in Journal
Enhancement of TiO2 NPs Activity by Fe3O4 Nano-Seeds for Removal of Organic Pollutants in Water
Article Menu
Issue 9 (September) cover image

Export Article

Open AccessArticle
Materials 2016, 9(9), 772; doi:10.3390/ma9090772

Electrochemical Corrosion Behavior of Ta2N Nanoceramic Coating in Simulated Body Fluid

1
Department of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, China
2
School of Mechanical & Electrical Engineering, Wuhan Institute of Technology, 693 Xiongchu Avenue, Wuhan 430073, China
3
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
View Full-Text   |   Download PDF [8109 KB, uploaded 10 September 2016]   |  

Abstract

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
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

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

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Materials EISSN 1996-1944 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top