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Mechanism of Microarc Oxidation Treated Ti6Al4V Alloy in a Magnetic Field

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Abstract

The growth kinetics mechanism of microarc oxidation (MAO) coatings on Ti6Al4V alloy in a magnetic field with a low current density of 2 A/dm2 was studied using scanning electron microscopy, energy dispersive spectroscopy, atomic force microscope, X-ray diffraction, and potentiodynamic polarization. The results show that the magnetohydrodynamics effect increased the electron current density during the MAO process. Then, a higher breakdown voltage of the anodic oxide film, faster growth of the MAO coatings, stronger and more concentrated microarc are obtained. Consequently, thick uneven coatings with high content of co-deposition oxides were obtained on samples rotating at 500 r/min in the magnetic field, resulting in uneven dense layer and poor corrosion resistance of the coating; the thin uniform coatings with a few co-deposition oxides were obtained on samples rotating at 3500 r/min in the magnetic field and also have poor corrosion resistance; both thickness and uniformity of the coatings are improved only for the sample rotating at 1500 r/min, resulting in good corrosion resistance of the coating. The thickness of the MAO coatings obtained on the low-speed rotating samples in the magnetic field increased parabolically with time, whereas that on high-speed rotating samples tends to increase linearly with time.

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Conflict of interest

On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Authors and Affiliations

  1. College of Material Science and Engineering, Chongqing University, Chongqing, 400044, P.R. China

    Dajun Zhai, Xiaoping Li & Jun Shen

  2. School of Mechanical Engineering, Sichuan University, Chengdu, 610065, P.R. China

    Keqin Feng

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  1. Dajun Zhai
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  2. Xiaoping Li
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  3. Jun Shen
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Correspondence to Jun Shen.

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Manuscript submitted September 21, 2021; accepted November 20, 2021.

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Zhai, D., Li, X., Shen, J. et al. Mechanism of Microarc Oxidation Treated Ti6Al4V Alloy in a Magnetic Field. Metall Mater Trans A 53, 1200–1207 (2022). https://doi.org/10.1007/s11661-021-06555-4

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