Effect of carbonate additive on the microstructure and corrosion resistance of plasma electrolytic oxidation coating on Mg–9Li–3Al alloy

Siyuan Jin; Xiaochun Ma; Ruizhi Wu; Tingqu Li; Jiaxiu Wang; Boris L Krit; Legan Hou; Jinghuai Zhang; Guixiang Wang

doi:10.1007/s12613-021-2377-0

Volume 29 Issue 7

Jul. 2022

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2022 > 29(7): 1453-1463

Siyuan Jin, Xiaochun Ma, Ruizhi Wu, Tingqu Li, Jiaxiu Wang, Boris L Krit, Legan Hou, Jinghuai Zhang, and Guixiang Wang, Effect of carbonate additive on the microstructure and corrosion resistance of plasma electrolytic oxidation coating on Mg–9Li–3Al alloy, Int. J. Miner. Metall. Mater., 29(2022), No. 7, pp. 1453-1463. https://doi.org/10.1007/s12613-021-2377-0

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Siyuan Jin, Xiaochun Ma, Ruizhi Wu, Tingqu Li, Jiaxiu Wang, Boris L Krit, Legan Hou, Jinghuai Zhang, and Guixiang Wang, Effect of carbonate additive on the microstructure and corrosion resistance of plasma electrolytic oxidation coating on Mg–9Li–3Al alloy, Int. J. Miner. Metall. Mater., 29(2022), No. 7, pp. 1453-1463. https://doi.org/10.1007/s12613-021-2377-0

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Research Article

Effect of carbonate additive on the microstructure and corrosion resistance of plasma electrolytic oxidation coating on Mg–9Li–3Al alloy

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Corresponding authors:
Ruizhi Wu E-mail: rzwu@hrbeu.edu.cn

Tingqu Li E-mail: ltq2000@163.com
Received: 3 September 2021; Revised: 3 November 2021; Accepted: 8 November 2021; Available online: 9 November 2021

Abstract

Abstract

Carbonate was added to the silicate system electrolyte to improve the corrosion resistance of the plasma electrolytic oxidation coating on Mg–9Li–3Al (wt%, LA93) alloy. The influences of carbonate on the morphology, structure, and phase composition of the coating were investigated by scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction, and X-ray photoelectron spectroscopy. The corrosion resistance of the coating was evaluated by electrochemical experiment, hydrogen evolution, and immersion test. The results showed that the addition of carbonate resulted in a denser coating with increased hardness, and the corrosion-resistant Li₂CO₃ phase was formed. Electrochemical experiments showed that compared with the coating without carbonate, the corrosion potential of the carbonate coating positively shifted (24 mV), and the corrosion current density was reduced by approximately an order of magnitude. The coating with carbonate addition possessed a high corrosion resistance and long-term protection capability.
- Mg–Li alloy;
- plasma electrolytic oxidation;
- corrosion resistance;
- carbonate

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