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Journal of Nanomaterials
Volume 2013, Article ID 319437, 8 pages
http://dx.doi.org/10.1155/2013/319437
Research Article

TiO2 Deposition on AZ31 Magnesium Alloy Using Plasma Electrolytic Oxidation

1Engineering Research Center (ERC), Mechanical Engineering, Department of Chemical, Biological, and Bio Engineering, North Carolina A & T State University, Greensboro, NC 27406, USA
2Engineering Research Center for Revolutionizing Metallic Biomaterials (ERC-RMB), North Carolina A & T State University, 1601 E. Market Street, IRC Room 119, Greensboro, NC 27411, USA

Received 12 June 2013; Revised 26 November 2013; Accepted 2 December 2013

Academic Editor: Wenhong Fan

Copyright © 2013 Leon White et al. 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.

Abstract

Plasma electrolytic oxidation (PEO) has been used in the past as a useful surface treatment technique to improve the anticorrosion properties of Mg alloys by forming protective layer. Coatings were prepared on AZ31 magnesium alloy in phosphate electrolyte with the addition of TiO2 nanoparticles using plasma electrolytic oxidation (PEO). This present work focuses on developing a TiO2 functional coating to create a novel electrophotocatalyst while observing the surface morphology, structure, composition, and corrosion resistance of the PEO coating. Microstructural characterization of the coating was investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) followed by image analysis and energy dispersive spectroscopy (EDX). The corrosion resistance of the PEO treated samples was evaluated with electrochemical impedance spectroscopy (EIS) and DC polarization tests in 3.5 wt.% NaCl. The XRD pattern shows that the components of the oxide film include Mg from the substrate as well as MgO and Mg2TiO4 due to the TiO2 nanoparticle addition. The results show that the PEO coating with TiO2 nanoparticles did improve the corrosion resistance when compared to the AZ31 substrate alloy.