Enhancing corrosion resistance of plasma electrolytic oxidation coatings on AM50 Mg alloy by inhibitor containing Ba(NO<sub>3</sub>)<sub>2</sub> solutions

Jirui Ma; Xiaopeng Lu; Santosh Prasad Sah; Qianqian Chen; You Zhang; Fuhui Wang

doi:10.1007/s12613-024-2876-x

Volume 31 Issue 9

Sep. 2024

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2024 > 31(9): 2048-2061

Jirui Ma, Xiaopeng Lu, Santosh Prasad Sah, Qianqian Chen, You Zhang, and Fuhui Wang, Enhancing corrosion resistance of plasma electrolytic oxidation coatings on AM50 Mg alloy by inhibitor containing Ba(NO₃)₂ solutions, Int. J. Miner. Metall. Mater., 31(2024), No. 9, pp. 2048-2061. https://doi.org/10.1007/s12613-024-2876-x

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Jirui Ma, Xiaopeng Lu, Santosh Prasad Sah, Qianqian Chen, You Zhang, and Fuhui Wang, Enhancing corrosion resistance of plasma electrolytic oxidation coatings on AM50 Mg alloy by inhibitor containing Ba(NO3)2 solutions, Int. J. Miner. Metall. Mater., 31(2024), No. 9, pp. 2048-2061. https://doi.org/10.1007/s12613-024-2876-x

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Research Article

Enhancing corrosion resistance of plasma electrolytic oxidation coatings on AM50 Mg alloy by inhibitor containing Ba(NO₃)₂ solutions

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Corresponding authors:
Xiaopeng Lu E-mail: luxiaopeng@mail.neu.edu.cn

You Zhang E-mail: youzhang@bipt.edu.cn
Received: 12 October 2023; Revised: 4 March 2024; Accepted: 5 March 2024; Available online: 7 March 2024

Abstract

Abstract

To enhance the long-term corrosion resistance of the plasma electrolytic oxidation (PEO) coating on the magnesium (Mg) alloy, an inorganic salt combined with corrosion inhibitors was used for posttreatment of the coating. In this study, the corrosion performance of PEO-coated AM50 Mg was significantly improved by loading sodium lauryl sulfonate (SDS) and sodium dodecyl benzene sulfonate into Ba(NO₃)₂ post-sealing solutions. Scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, Fourier transform infrared spectrometer, and ultraviolet–visible analyses showed that the inhibitors enhanced the incorporation of BaO₂ into PEO coatings. Electrochemical impedance showed that post-sealing in Ba(NO₃)₂/SDS treatment enhanced corrosion resistance by three orders of magnitude. The total impedance value remained at 926 Ω·cm² after immersing in a 0.5wt% NaCl solution for 768 h. A salt spray test for 40 days did not show any obvious region of corrosion, proving excellent post-sealing by Ba(NO₃)₂/SDS treatment. The corrosion resistance of the coating was enhanced through the synergistic effect of BaO₂ pore sealing and SDS adsorption.
- Mg;
- plasma electrolytic oxidation;
- posttreatment;
- corrosion resistance

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