Comparison of Biocompatible Coatings Produced by Plasma Electrolytic Oxidation on cp-Ti and Ti-Zr-Nb Superelastic Alloy
| Autor: | Yulia Zhukova, Sergey Prokoshkin, A. G. Raab, V. Sheremetyev, E.V. Parfenov, Olga Melnichuk, R. G. Farrakhov, V. R. Mukaeva |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
plasma electrolytic oxidation corrosion resistance Scanning electron microscope Alloy Surfaces and Interfaces engineering.material Plasma electrolytic oxidation Ti-Zr-Nb alloys Surfaces Coatings and Films Dielectric spectroscopy Corrosion Coating lcsh:TA1-2040 superelasticity Materials Chemistry engineering nickel-free shape memory alloys Composite material Porosity lcsh:Engineering (General). Civil engineering (General) surface modification Cottrell equation |
| Zdroj: | Coatings, Vol 11, Iss 401, p 401 (2021) Coatings Volume 11 Issue 4 |
| ISSN: | 2079-6412 |
| Popis: | The paper compares the coatings produced by plasma electrolytic oxidation (PEO) on commercially pure titanium and a novel superelastic alloy Ti-18Zr-15Nb (at. %) for implant applications. The PEO coatings were produced on both alloys in the identical pulsed bipolar regime. The properties of the coatings were examined using scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy-dispersive X-ray spectroscopy (EDX), potentiodynamic polarization (PDP), and electrochemical impedance spectroscopy (EIS). The PEO process kinetics was modeled based on the Avrami theorem and Cottrell equation using a relaxation method. The resultant coatings contain TiO2, for both alloys, and NbO2, Nb2O5, ZrO2 for Ti-18Zr-15Nb alloy. The coating on the Ti-18Zr-15Nb alloy has a higher thickness, porosity, and roughness compared to that on cp-Ti. The values of the kinetic coefficients of the PEO process—higher diffusion coefficient and lower time constant for the processing of Ti-18Zr-15Nb—explain this effect. According to the electrochemical studies, PEO coatings on Ti-18Zr-15Nb alloy provide better corrosion protection. Higher corrosion resistance, porosity, and roughness contribute to better biocompatibility of the PEO coating on Ti-18Zr-15Nb alloy compared to cp-Ti. |
| Databáze: | OpenAIRE |
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