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Materials 2018, 11(9), 1618; https://doi.org/10.3390/ma11091618

Plasma Electrolytic Oxidation of Magnesium Alloy AZ31B in Electrolyte Containing Al2O3 Sol as Additives

College of Biological and Chemical Engineering, Jiaxing University, Jiaxing 314001, China
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Received: 8 August 2018 / Revised: 24 August 2018 / Accepted: 30 August 2018 / Published: 5 September 2018
(This article belongs to the Special Issue Metals Functionalization via Plasma Electrolytic Oxidation)
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Abstract

Plasma electrolytic oxidation (PEO) coatings were produced on AZ31B magnesium alloys in alkaline electrolytes with the addition of various concentrations of Al2O3 sols. Effects of Al2O3 sol concentrations on the microstructure, phase composition, corrosion resistance and hardness of PEO coatings were evaluated by scanning electron microscopy (SEM), X-ray diffraction (XRD), microhardness testing and potentiodynamic polarization measurements, respectively. It was revealed that the Al2O3 sol mostly participated in the formation of the ceramic coating and transferred into the MgAl2O4 phase. With the increase of the Al2O3 sol concentration in the range of 0–6 vol%, the coating performance in terms of the microstructure, diffraction peak intensity of the MgAl2O4 phase, corrosion resistance and microhardness was improved. Further increase of Al2O3 sol addition did not generate better results. This indicated that 6 vol% might be the proper Al2O3 sol concentration for the formation of PEO coatings. View Full-Text
Keywords: magnesium alloy; plasma electrolytic oxidation; Al2O3 sol; corrosion resistance magnesium alloy; plasma electrolytic oxidation; Al2O3 sol; corrosion resistance
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Tu, X.; Miao, C.; Zhang, Y.; Xu, Y.; Li, J. Plasma Electrolytic Oxidation of Magnesium Alloy AZ31B in Electrolyte Containing Al2O3 Sol as Additives. Materials 2018, 11, 1618.

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