Abstract
The aim of this study is to grow a zirconia ceramic film in alkaline electrolyte on Zr3Ta biomedical alloy by plasma electrolytic oxidation technique (PEO) and to demonstrate the surface properties improvement after this process. The surface characterization and corrosion behavior of as‐cast and oxidized Zr3Ta alloy were investigated in fetal bovine serum at 37 °C and atmospheric pressure without agitation, using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization as electrochemical techniques. As surface characterization techniques, we used scanning electron microscopy, X‐ray diffraction (XRD), and Vickers micro‐hardness measurements. Ion release phenomena were investigated using inductively coupled plasma – mass spectrometry technique (ICP‐MS). Impedance spectra were represented by Nyquist and Bode diagrams, and electrical equivalent circuits were also proposed for obtained results. XRD analysis was used to identify the chemical composition of the outer oxide layer and pointed out the formation of two zirconium oxides consist of a black non‐stoichiometric zirconium oxide layer and a small amount of white stoichiometric zirconium oxide which has poor quality. During the PEO process, a zirconium oxide layer is formed on the alloy surface, which improves corrosion resistance and surface micro‐hardness. Copyright © 2012 John Wiley & Sons, Ltd.
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