10.14489/td.2026.05.pp.060-067

2026, 05 May

DOI: 10.14489/td.2026.05.pp.060-067

Bao F., Bashkov O. V.
ACOUSTIC EMISSION: A NEW APPROACH TO THE ANALYSIS OF DISCHARGE MECHANISMS IN MICROARC OXIDATION
(pp. 60-67)

Abstract. Microarc oxidation (MAO) is widely used for surface modification of non-ferrous metals; however, optimization of its parameters requires significant experimental effort. In this study, the MAO process on D16AT aluminum alloy in a silicate electrolyte was monitored using acoustic emission (AE). Analysis of AE signals allowed for clear identification of the process stages, particularly the initial phase. Classification of signals at different current densities established a relationship between discharge mechanisms, AE signal types, and film formation stages. Transition points between stages were determined using frequency characteristics. It is demonstrated that AE is an effective tool for operational monitoring, prediction, and optimization of MAO coating properties.

Keywords: microarc oxidation, acoustic emission, aluminum alloy, D16, oxide layer, t-SNE.

+ - About the Authors Click to collapse

F. Bao (Harbin University of Science and Technology, Harbin, China) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.
O. V. Bashkov (Komsomolsk-na-Amure State University, Komsomolsk-on-Amur, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

+ - References Click to collapse

1. Tsai, D., & Chou, C. (2018). Review of the soft sparking issues in plasma electrolytic oxidation. Metals, 8(2), Article 105. https://doi.org/10.3390/met8020105
2. Kaseem, M., Fatimah, S., Nashrah, N., & Ko, Y. G. (2021). Recent progress in surface modification of metals coated by plasma electrolytic oxidation: Principle, structure, and performance. Progress in Materials Science, 117, Article 100735. https://doi.org/10.1016/j.pmatsci.2020.100735
3. Cheng, Y., Wu, X., Xue, Z., et al. (2013). Microstructure, corrosion and wear performance of plasma electrolytic oxidation coatings formed on Ti–6Al–4V alloy in silicate-hexametaphosphate electrolyte. Surface and Coatings Technology, 217, 129–139. https://doi.org/10.1016/j.surfcoat.2012.12.003
4. Askarnia, R., Fardi, S. R., Sobhani, M., et al. (2022). Effect of graphene oxide on properties of AZ91 magnesium alloys coating developed by micro-arc oxidation process. Journal of Alloys and Compounds, 892, Article 162106. https://doi.org/10.1016/j.jallcom.2021.162106
5. Snezhko, L., Erokhin, A., Kalinichenko, O., & Mis¬nyankin, D. (2016). Hydrogen release on the anode in the course of plasma electrolytic oxidation of aluminum. Materials Science, 52, 421–430. https://doi.org/10.1007/s11003-016-9974-5
6. Tu, W., Cheng, Y., Wang, X., et al. (2017). Plasma electrolytic oxidation of AZ31 magnesium alloy in aluminate-tungstate electrolytes and the coating formation mechanism. Journal of Alloys and Compounds, 725, 199–216. https://doi.org/10.1016/j.jallcom.2017.07.117
7. De Izarra, C. (2000). UV OH spectrum used as a molecular pyrometer. Journal of Physics D: Applied Physics, 33, 1697. https://doi.org/10.1088/0022-3727/33/14/309
8. Yao, Z., Xia, Q., Wei, H., et al. (2015). Study on coating growth characteristics during the electrolytic oxidation of a magnesium-lithium alloy by optical emission spectroscopy analysis. RSC Advances, 5, 68806–68814. https://doi.org/10.1039/C5RA09378C
9. Boinet, M., Verdier, S., Maximovitch, S., & Dalard, F. (2004). Application of acoustic emission technique for in situ study of plasma anodizing. NDT & E International, 37, 213–219. https://doi.org/10.1016/j.ndteint.2003.09.011
10. Bespalova, Zh. I., & Panenko, I. N. (2018). Investigation of the influence of electrolyte composition and modes of the microarc oxidation process on the structure, morphology and properties of oxide-ceramic coatings. Elektronnaya obrabotka materialov, 54(1), 22–29. https://doi.org/10.5281/zenodo.1168356 [in Russian language]
11. Mukaeva, V. R., Gorbatkov, M. V., Farrakhov, R. G., & Parfenov, E. V. (2018). A study of the acoustic characteristics of plasma electrolytic oxidation of aluminum. Elektrotekhnicheskie i informatsionnye kompleksy i sistemy, 14, 60–65.
12. Liao, Y., Zhou, Q., Gao, C., et al. (2024). Acoustic emission characteristics of micro-discharges in initial pulsed PEO process on 60 % SiCp/Al composite. Ultrasonics, 138, Article 107213. https://doi.org/10.1016/j.ultras.2023.107213
13. Bashkov, O., Popkova, A., Gadoev, G., et al. (2019). Construction of a generalized fatigue diagram of metallic materials. Materials Science Forum, 945, 563–568. https://doi.org/10.4028/www.scientific.net/MSF.945.563
14. Muir, C., Swaminathan, B., Almansour, A., et al. (2021). Damage mechanism identification in composites via machine learning and acoustic emission. npj Computational Materials, 7, Article 95. https://doi.org/10.1038/s41524-021-00565-x
15. Devassy, B. M., & George, S. (2020). Dimensionality reduction and visualisation of hyperspectral ink data using t-SNE. Forensic Science International, 311, Article 110194. https://doi.org/10.1016/j.forsciint.2020.110194
16. Hussein, R. O., Nie, X., Northwood, D. O., et al. (2010). Spectroscopic study of electrolytic plasma and discharging behaviour during the plasma electrolytic oxidation (PEO) process. Journal of Physics D: Applied Physics, 43(10), Article 105203.

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