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Volume 18
Issue 9
10.3390/ma18091962
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

The Effect of Pulse Frequency on the Microstructure and Corrosion Resistance of an AZ31B Magnesium Alloy Composite Coating with Electron-Beam Remelting and Micro-Arc Oxidation

by
Yinghe Ma
1,2,
Zhen Yu
1,2,
Jinpeng Zhang
1,2,
Yonghui Hu
1,2,
Mengliang Zhou
1,2,
Jinhui Mei
1,2,
Zhihui Cai
3,*,
Wenjian Zheng
1,2 and
Jianguo Yang
1,2,*
1
Institute of Process Equipment and Control Engineering, College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, China
2
Engineering Research Center of Process Equipment and Remanufacturing, Ministry of Education, Zhejiang University of Technology, Hangzhou 310023, China
3
Wenzhou Special Equipment Inspection & Science Research Institute, Wenzhou 325800, China
*
Authors to whom correspondence should be addressed.
Materials 2025, 18(9), 1962; https://doi.org/10.3390/ma18091962
Submission received: 24 February 2025 / Revised: 8 April 2025 / Accepted: 22 April 2025 / Published: 25 April 2025
(This article belongs to the Special Issue Latest Research in Joining and Welding Processes)
Versions Notes

Abstract

This study presents a systematic investigation into the influence of pulse frequency on the micro-arc oxidation (MAO) coating of AZ31B magnesium alloy following electron-beam remelting (EBR). The morphology, thickness, and corrosion resistance of the EBR-MAO composite coating were meticulously analyzed across various pulse frequencies (100 Hz, 200 Hz, 300 Hz, 400 Hz) employing scanning electron microscopy (SEM), X-ray diffraction (XRD), and electrochemical measurement techniques. The results show that as the pulse frequency escalates from 100 Hz to 400 Hz, the average thickness of the EBR-MAO composite coating diminishes from 41.1 μm to 38.5 μm, reduced by 6.7% compared to 10.4% in the MAO coating. Concurrently, the porosity exhibits a reduction from 1.93% to 1.35%, accompanied by a densification of the coating's structure. High pulse frequencies yield coatings with enhanced smoothness and fewer defects. Notably, the corrosion resistance of the coatings demonstrates significant improvement at higher frequencies (400 Hz) compared to their lower-frequency (100 Hz) counterparts, as evidenced by a tenfold increase in corrosion current density. This research underscores the pivotal role of pulse frequency in optimizing the protective qualities of MAO coatings on magnesium alloys.
Keywords: AZ31B magnesium alloy; micro-arc oxidation; electron-beam remelting; corrosion resistance; pulse frequency AZ31B magnesium alloy; micro-arc oxidation; electron-beam remelting; corrosion resistance; pulse frequency

Share and Cite

MDPI and ACS Style

Ma, Y.; Yu, Z.; Zhang, J.; Hu, Y.; Zhou, M.; Mei, J.; Cai, Z.; Zheng, W.; Yang, J. The Effect of Pulse Frequency on the Microstructure and Corrosion Resistance of an AZ31B Magnesium Alloy Composite Coating with Electron-Beam Remelting and Micro-Arc Oxidation. Materials 2025, 18, 1962. https://doi.org/10.3390/ma18091962

AMA Style

Ma Y, Yu Z, Zhang J, Hu Y, Zhou M, Mei J, Cai Z, Zheng W, Yang J. The Effect of Pulse Frequency on the Microstructure and Corrosion Resistance of an AZ31B Magnesium Alloy Composite Coating with Electron-Beam Remelting and Micro-Arc Oxidation. Materials. 2025; 18(9):1962. https://doi.org/10.3390/ma18091962

Chicago/Turabian Style

Ma, Yinghe, Zhen Yu, Jinpeng Zhang, Yonghui Hu, Mengliang Zhou, Jinhui Mei, Zhihui Cai, Wenjian Zheng, and Jianguo Yang. 2025. "The Effect of Pulse Frequency on the Microstructure and Corrosion Resistance of an AZ31B Magnesium Alloy Composite Coating with Electron-Beam Remelting and Micro-Arc Oxidation" Materials 18, no. 9: 1962. https://doi.org/10.3390/ma18091962

APA Style

Ma, Y., Yu, Z., Zhang, J., Hu, Y., Zhou, M., Mei, J., Cai, Z., Zheng, W., & Yang, J. (2025). The Effect of Pulse Frequency on the Microstructure and Corrosion Resistance of an AZ31B Magnesium Alloy Composite Coating with Electron-Beam Remelting and Micro-Arc Oxidation. Materials, 18(9), 1962. https://doi.org/10.3390/ma18091962

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