Preparation and property of self-sealed plasma electrolytic oxide coating on magnesium alloy

Chen Ma; Dong Wang; Jinyu Liu; Ning Peng; Wei Shang; Yuqing Wen

doi:10.1007/s12613-022-2542-0

Volume 30 Issue 5

May 2023

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2023 > 30(5): 959-969

Chen Ma, Dong Wang, Jinyu Liu, Ning Peng, Wei Shang, and Yuqing Wen, Preparation and property of self-sealed plasma electrolytic oxide coating on magnesium alloy, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 959-969. https://doi.org/10.1007/s12613-022-2542-0

Cite this article as:

Chen Ma, Dong Wang, Jinyu Liu, Ning Peng, Wei Shang, and Yuqing Wen, Preparation and property of self-sealed plasma electrolytic oxide coating on magnesium alloy, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 959-969. https://doi.org/10.1007/s12613-022-2542-0

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Research Article

Preparation and property of self-sealed plasma electrolytic oxide coating on magnesium alloy

+ Author Affiliations

Corresponding authors:
Wei Shang E-mail: 2001018@glut.edu.cn

Yuqing Wen E-mail: 2006027@glut.edu.cn
Received: 17 May 2022; Revised: 25 August 2022; Accepted: 26 August 2022; Available online: 30 August 2022

Abstract

Abstract

Plasma electrochemical oxidation (PEO) is a surface modification technology to form ceramic coatings on magnesium alloys. However, its application is limited due to its defects. This work reports a novel preparation of in-situ sealing of PEO coatings by four-layer voltage and sol addition. The morphology and structure were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and X-ray diffractometer (XRD). Image-Pro Plus 6.0 was used to determine the porosity of the coating, which was decreased from 8.53% to 0.51%. Simultaneously, the coating thickness was increased by a factor of four. The anti-corrosion performance of each sample was evaluated using electrochemical tests, and the findings revealed that the corrosion current density of coatings (i_corr)of the samples were lowered from 9.152 × 10^–2 to 6.152 × 10^–4 mA·cm⁻², and the total resistance (R_T) of the samples were enhanced from 2.19 × 10⁴ to 2.33 × 10⁵ Ω·cm². The salt spray test used to simulate the actual environment showed that corrosion points appeared on the surface of the coating only at the 336 h. In addition, the mechanism of PEO self-sealing behavior was described in this article.
- magnesium alloy;
- in-situ sealing;
- plasma electrolytic oxidation;
- corrosion resistance

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