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

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Abstract

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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Acknowledgements

This research is funded by China Postdoctoral Science Foundation (No. 2021M700569) and Chongqing Postdoctoral Science Foundation (No. 7 cstc2021jcyj-bshX0087).

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  1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China

    Dajun Zhai, Xiaoping Li & Jun Shen

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  1. Dajun Zhai
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Correspondence to Jun Shen.

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Zhai, D., Li, X. & Shen, J. Mechanism of microarc oxidation on AZ91D Mg alloy induced by β-Mg17Al12 phase. Int J Miner Metall Mater 31, 712–724 (2024). https://doi.org/10.1007/s12613-023-2752-0

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