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Influence of sodium fluoride in acidic electrolytic solution on the structure and properties of plasma electrolytic oxidation coating on AZ91D magnesium alloy

  • Metals & corrosion
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Abstract

By adopting the strategy of generating chelating agents during plasma electrolytic oxidation (PEO), PEO coatings were prepared in acidic eletrolytic solution by constant current mode. The effect of NaF concentration on the coating and the growth and regulation mechanism of fluoride in acidic eletrolytic solution by constant current mode were explored. The composition, structure, corrosion resistance, and formation mechanism of the coating were investigated. The results showed that the addition of NaF into the acidic electrolyte solution caused the pore diameter decreased, while the coating thickness and compactness were increased. The increase of NaF concentration in the acid electrolyte increases the MgF2 content and affects the adhesion of the coating to the substrate, which was attributed to the changes in the spark discharge characteristics. Subsequently, the self-sealing of the coating and the amount of MgF2 composition in the coating will affect the corrosion resistance of the coating. The PEO coating fabricated in the acidic electrolyte solution containing 7 g/L NaF displayed small pore size, stronger bonding, and thicker coating, which resulted in superior corrosion resistance, the lowest corrosion tendency and enhance the polarization resistance.

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Acknowledgements

This work was supported by the Beijing Natural Science Foundation (2202017), and the URT program of Beijing Institute of Petrochemical Technology (2021J00181 and 2020X00176).

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Authors and Affiliations

  1. College of New Materials and Chemical Engineering, Beijing Institute of Petrochemical Technology, Beijing, 102617, China

    Zhiwei Rong, Yubo Bai, Zheng Dou, Lei Liu & Fei Chen

  2. School of Advanced Materials, Peking University Shenzhen Graduate School, Shenzhen, 518055, China

    Yulin Zhang

  3. Chinese Academy of Agricultural Mechanization Sciences, Beijing JinLunKunTian Special Machine Co.Led., Beijing, 100083, China

    Haoyue Tian

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Contributions

This article is a joint effort by all members and I will explain their contributions and express my gratitude to them. FC: Conceptualization, Writing—Review and Editing; Funding acquisition. ZR: Writing—Original Draft; Investigation; Fabrication, Validation. YB, LL: Writin—review and editing. Conceptualization. HT: Supervision. ZD: Investigation, Fabrication. YZ: Supervision; Conceptualization.

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Correspondence to Zhiwei Rong or Fei Chen.

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Rong, Z., Bai, Y., Tian, H. et al. Influence of sodium fluoride in acidic electrolytic solution on the structure and properties of plasma electrolytic oxidation coating on AZ91D magnesium alloy. J Mater Sci 58, 8103–8117 (2023). https://doi.org/10.1007/s10853-023-08469-5

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