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Effect of the graphene oxide additive on the corrosion resistance of the plasma electrolytic oxidation coating of the AZ31 magnesium alloy

•A novel approach to improve the corrosion resistance of PEO coating of Mg alloy was developed by adding GO in the electrolyte.•The incorporation of GO decreased the porosity of the PEO coating.•With 2g/L GO in the electrolyte, the optimal corrosion resistance was achieved. Graphene oxide (GO) was a...

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Published in:	Corrosion science 2017-01, Vol.114, p.146-155
Main Authors:	Zhao, Jingmao, Xie, Xiong, Zhang, Chen
Format:	Article
Language:	English
Subjects:	A. magnesium B. EIS B. polarization B. SEM C. anodic films Coating effects Composition effects Corrosion effects Corrosion resistance Corrosion tests Electrolytes Graphene Magnesium Magnesium base alloys Microstructure Oxidation Oxidation resistance Phase composition Protective coatings
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creator	Zhao, Jingmao Xie, Xiong Zhang, Chen
description	•A novel approach to improve the corrosion resistance of PEO coating of Mg alloy was developed by adding GO in the electrolyte.•The incorporation of GO decreased the porosity of the PEO coating.•With 2g/L GO in the electrolyte, the optimal corrosion resistance was achieved. Graphene oxide (GO) was added into the electrolyte during the preparation of the plasma electrolytic oxidation (PEO) coating on AZ31 magnesium alloy. The effects of the GO additive on the microstructure, phase composition, and corrosion resistance of the PEO coating were studied. The results demonstrated that GO successfully incorporated into the PEO coating and it was partially reduced to rGO during the PEO process. As a result, the number of micropores on the PEO coating was significantly decreased. Moreover, the electrochemical test revealed that the corrosion resistance of the PEO coating was markedly improved upon the incorporation of 2g/L GO.
doi_str_mv	10.1016/j.corsci.2016.11.007
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EIS</topic><topic>B. polarization</topic><topic>B. 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source	ScienceDirect Freedom Collection
subjects	A. magnesium B. EIS B. polarization B. SEM C. anodic films Coating effects Composition effects Corrosion effects Corrosion resistance Corrosion tests Electrolytes Graphene Magnesium Magnesium base alloys Microstructure Oxidation Oxidation resistance Phase composition Protective coatings
title	Effect of the graphene oxide additive on the corrosion resistance of the plasma electrolytic oxidation coating of the AZ31 magnesium alloy
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