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

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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 (icorr) of the samples were lowered from 9.152 × 10−2 to 6.152 × 10−4 mA·cm−2, and the total resistance (RT) 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.

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Acknowledgements

This work was financially supported by the Guangxi Natural Science Foundation (No. 2020GXNSFAA159011) and the National Natural Science Foundation of China (No. 51664011).

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Authors and Affiliations

  1. Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials, College of Chemistry and Bioengineering, Guilin University of Technology, Guilin, 541004, China

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

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  1. Chen Ma
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  2. Dong Wang
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Correspondence to Wei Shang or Yuqing Wen.

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Ma, C., Wang, D., Liu, J. et al. Preparation and property of self-sealed plasma electrolytic oxide coating on magnesium alloy. Int J Miner Metall Mater 30, 959–969 (2023). https://doi.org/10.1007/s12613-022-2542-0

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  • DOI: https://doi.org/10.1007/s12613-022-2542-0

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