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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Bibliographic Details
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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Summary:•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.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2016.11.007