Dajun Zhai, Xiaoping Li, and Jun Shen, Mechanism of microarc oxidation on AZ91D Mg alloy induced by β-Mg17Al12 phase, Int. J. Miner. Metall. Mater., 31(2024), No. 4, pp. 712-724. https://doi.org/10.1007/s12613-023-2752-0
Cite this article as:
Dajun Zhai, Xiaoping Li, and Jun Shen, Mechanism of microarc oxidation on AZ91D Mg alloy induced by β-Mg17Al12 phase, Int. J. Miner. Metall. Mater., 31(2024), No. 4, pp. 712-724. https://doi.org/10.1007/s12613-023-2752-0
Research Article

Mechanism of microarc oxidation on AZ91D Mg alloy induced by β-Mg17Al12 phase

+ Author Affiliations
  • Corresponding author:

    Jun Shen    E-mail: shenjun@cqu.edu.cn

  • Received: 10 May 2023Revised: 6 September 2023Accepted: 25 September 2023Available online: 28 September 2023
  • This work proposed a strategy of indirectly inducing uniform microarc discharge by controlling the content and distribution of β-Mg17Al12 phase in AZ91D Mg alloy. Two kinds of nano-particles (ZrO2 and TiO2) were designed to be added into the substrate of Mg alloy by friction stir processing (FSP). Then, Mg alloy sample designed with different precipitated morphology of β-Mg17Al12 phase was treated by microarc oxidation (MAO) in Na3PO4/Na2SiO3 electrolyte. The characteristics and performance of the MAO coating was analyzed using scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), contact angle meter, and potentiodynamic polarization. It was found that the coarse α-Mg grains in extruded AZ91D Mg alloy were refined by FSP, and the β-Mg17Al12 phase with reticular structure was broken and dispersed. The nano-ZrO2 particles were pinned at the grain boundary by FSP, which refined the α-Mg grain and promoted the precipitation of β-Mg17Al12 phase in grains. It effectively inhibited the “cascade” phenomenon of microarcs, which induced the uniform distribution of discharge pores. The MAO coating on Zr-FSP sample had good wettability and corrosion resistance. However, TiO2 particles were hardly detected in the coating on Ti-FSP sample.
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