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

doi:10.1007/s40145-013-0064-y

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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.

Key words： micro-arc oxidation (MAO) ultrasonic treatment magnesium alloy microstructure corrosion resistance

Received: 01 February 2013 Published: 10 September 2015

Corresponding Authors: Muqin LI

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	Lijie QU
	Muqin LI
	Miao LIU
	Erlin ZHANG
	Chen MA

Cite this article:

Lijie QU,Muqin LI,Miao LIU, et al. Microstructure and corrosion resistance of ultrasonic micro-arc oxidation biocoatings on magnesium alloy[J]. Journal of Advanced Ceramics, 2013, 2(3): 227-234.

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http://jac.tsinghuajournals.com/EN/10.1007/s40145-013-0064-y OR http://jac.tsinghuajournals.com/EN/Y2013/V2/I3/227

Composition and mechanical properties of the magnesium alloy

Surface and cross morphologies of MAO and UMAO coatings.

AFM topographies of the cross coatings coated under different ultrasonic powers.

EDX analysis of coatings coated under different ultrasonic powers.

XRD patterns of magnesium alloy coated under different ultrasonic powers.

EDX of coatings line scanning analysis.

Results of potentiodynamic corrosion tests in SBF

Potentiodynamic polarization curves of the bare and coated magnesium alloy.

Electrochemical corrosion morphologies of the bare and coated magnesium alloy.

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