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Research Article | Open Access

Microstructure and corrosion resistance of ultrasonic micro-arc oxidation biocoatings on magnesium alloy

Lijie QUa,b, Muqin LIa,b,*( ), Miao LIUc, Erlin ZHANGb, Chen MAb
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
Department of Stomatology, Jiamusi University, Jiamusi 154007, China
Department of Materials Science and Engineering, Jiamusi University, Jiamusi 154007, China
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Abstract

The ultrasonic micro-arc oxidation (UMAO) was used to fabricate ceramic coatings on magnesium alloy. UMAO coatings were produced at 60 W input ultrasonic. The effects of the ultrasound on the microstructure, phase composition, elemental distribution and corrosion resistance of the coatings were extensively investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy-dispersive X-ray spectrometry (EDX) and electrochemical workstation. The results showed that ultrasound improved the homogeneous distribution of micro-porous structure. The coatings were mainly composed of MgO ceramic and small amount of calcium and phosphorus with porous structure. The Ca/P ratio of the coatings increased when 60 W ultrasonic was used. The corrosion potential in simulated body fluid (SBF) changed from -1.583 V of bare magnesium alloy to -0.353 V of magnesium alloy coated under 60 W ultrasonic. The corrosion resistance of UMAO coatings was better than that of MAO coatings.

Keywords

microstructuremicro-arc oxidation (MAO)ultrasonic treatmentmagnesium alloycorrosion resistance

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Journal of Advanced Ceramics
Volume 2 Issue 3,
September 2013
Pages 227-234
DOI: 10.1007/s40145-013-0064-y
Cite this article:
QU L, LI M, LIU M, et al. Microstructure and corrosion resistance of ultrasonic micro-arc oxidation biocoatings on magnesium alloy. Journal of Advanced Ceramics, 2013, 2(3): 227-234. https://doi.org/10.1007/s40145-013-0064-y

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Received: 01 February 2013
Revised: 12 April 2013
Accepted: 15 April 2013
Published: 07 September 2013
© The author(s) 2013

Open Access: This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
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