Effect of the graphene oxide additive on the corrosion resistance of the plasma electrolytic oxidation coating of the AZ31 magnesium alloy. (January 2017)

• Record Type: Journal Article
• Authors: Zhao, Jingmao; Xie, Xiong; Zhang, Chen
• Is Part Of: Corrosion science. Volume 114(2017)
• Page Start: 146
• Page End: 155
• Publication Date: 2017-01
• Subjects: A. magnesium -- B. polarization -- B. EIS -- B. SEM -- C. anodic films; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2016.11.007
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: 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 2 g/L GO in the electrolyte, the optimal corrosion resistance was achieved. Abstract: 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 2 g/L GO.