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

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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.

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Acknowledgements

This work was financially supported by the Natural Science Foundation of China (Nos. 51771060, 51871068, 51971071, and 52011530025), the Domain Foundation of Equipment Advance Research of 13th Five-year Plan, China (No. 61409220118), the Zhejiang Province Key Research and Development Program, China (No. 2021C01086), and the Open Foundation of Key Laboratory of Superlight Materials & Surface Technology of Ministry of Education, China (No. HEU10202104).

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Authors and Affiliations

  1. Key Laboratory of Superlight Materials & Surface Technology, Ministry of Education, Harbin Engineering University, Harbin, 150001, China

    Siyuan Jin, Xiaochun Ma, Ruizhi Wu, Jiaxiu Wang, Jinghuai Zhang & Guixiang Wang

  2. College of Materials Science and Engineering, Jilin Institute of Chemical Technology, Jilin, 132022, China

    Tingqu Li

  3. College of Science, Heihe University, Heihe, 164300, China

    Ruizhi Wu

  4. Moscow Aviation Institute, National Research University, Moscow, 125993, Russia

    Boris L. Krit & Legan Hou

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  1. Siyuan Jin
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Correspondence to Ruizhi Wu or Tingqu Li.

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We declare that we have no financial and personal relationships with other people or organizations that can inappropriately influence our work, there is no professional or other personal interest of any nature or kind in any product, service and/or company that could be construed as influencing the position presented in, or the review of, the manuscript entitled.

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Jin, S., Ma, X., Wu, R. et al. 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, 1453–1463 (2022). https://doi.org/10.1007/s12613-021-2377-0

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