SURFACE CHARACTERIZATION OF ZrO2/Zr COATING ON Ti6Al4V AND IN VITRO EVALUATION OF CORROSION BEHAVIOR AND BIOCOMPATIBILITY

Ruoyun Wang, Yonghua Sun, Xiaojing He, Yuee Gao and Xiaohong Yao
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Ruoyun Wang: College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China
Yonghua Sun: #x2020;Polytechnic Institute Taiyuan University of Technology, Xiaoyi 032300, P. R. China
Xiaojing He: College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China
Yuee Gao: College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China
Xiaohong Yao: College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, P. R. China

Surface Review and Letters (SRL), 2017, vol. 24, issue Supp01, 1-9

Abstract: Biocompatibility is crucial for implants. In recent years, numerous researches were conducted aiming to modify titanium alloys, which are the most extensively used materials in orthopedic fields. The application of zirconia in the biomedical field has recently been explored. In this study, the biological ZrO2 coating was synthesized on titaniumalloy (Ti6Al4V) substrates by a duplex-treatment technique combining magnetron sputtering with micro-arc oxidation (MAO) in order to further improve the corrosion resistance and biocompatibility of Ti6Al4V alloys. The microstructures and phase constituents of the coatings were characterized by scanning electron microscope (SEM) equipped with energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD), the surface wettability was evaluated by contact angle measurements. The results show that ZrO2 coatings are porous with pore sizes less than 2μm and consist predominantly of the tetragonal ZrO2 (t-ZrO2) and cubic ZrO2(c-ZrO2) phase. Electrochemical tests indicate that the corrosion rate of Ti6Al4V substrates is appreciably reduced after surface treatment in the phosphate buffer saline (PBS). In addition, significantly improved cell adhesion and growth were observed from the ZrO2/Zr surface. Therefore, the hybrid approach of magnetron sputtering and MAO provides a surface modification for Ti6Al4V to achieve acceptable corrosion resistance and biocompatibility.

Keywords: Magnetron sputtering; micro-arc oxidation; Ti6Al4V alloy; ZrO2 coating; corrosion resistance; biocompatibility (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X18500038

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