Cailiao Baohu (Jul 2023)

Process and Mechanism of Removing Micro-Arc Oxidation Coating on Titanium Alloy by Plasma Electrolysis

  • ZOU Yongchun, WANG Shuqi, WANG Yaming, CHEN Guoliang, ZHANG Kaiwei, OUYANG Jiahu, JIA Dechang, ZHOU Yu

DOI
https://doi.org/10.16577/j.issn.1001-1560.2023.0157
Journal volume & issue
Vol. 56, no. 7
pp. 25 – 30

Abstract

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During the preparation and service process of micro-arc oxidation coatings，phenomena such as uneven growth or surface wear and peeling emerged，so the micro-arc oxidation coatings should be removed to achieve the purpose of secondary preparation and reuse.Aiming at the bottleneck problem of difficulty to remove micro-arc oxidation coating with high bonding strength，a novel plasma electrolytic removal(PER) technique was presented in this work.By comparing and analyzing the coating removal rates at different voltages，thickness change，and microstructure after coating removal at different times，it was found that the coating removal efficiency was the lowest with the applied voltage of 260 V，and the coating was completely removed after 11 min.When the voltage was increased to 320 V，the coating was completely removed in only 6 min.This was due to the large applied voltage，which made it easier to generate multiple and stable plasma discharge channels，thus realizing rapid removal of micro-arc oxidation coating.Furthermore，a synergistic mechanism of peeling，thinning，and dissolution in the removal of coatings by plasma electrolysis was proposed.The PER technique exhibits high efficiency and environmental protection，which has broad application prospects in the fields of aerospace，medical instruments and so on.

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