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:10.16577/j.issn.1001-1560.2023.0157

Materials Protection >

2023 , Vol. 56 >Issue 7: 25 - 30

DOI: https://doi.org/10.16577/j.issn.1001-1560.2023.0157

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

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1.Institute for Advanced Ceramics，Harbin Institute of Technology，Harbin 150001，China；2.Center of Analysis Measurement and Computing，Harbin Institute of Technology，Harbin 150008，China

Received date: 2022-01-27

Revised date: 2022-02-15

Accepted date: 2022-03-26

Online published: 2023-08-23

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Abstract

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.

Key words： plasma electrolysis; coating removal; micro-arc oxidation; titanium alloy

Cite this article

ZOU Yongchun, WANG Shuqi, WANG Yaming, CHEN Guoliang, ZHANG Kaiwei, OUYANG Jiahu, JIA Dechang, ZHOU Yu . Process and Mechanism of Removing Micro-Arc Oxidation Coating on Titanium Alloy by Plasma Electrolysis[J]. Materials Protection, 2023 , 56(7) : 25 -30 . DOI: 10.16577/j.issn.1001-1560.2023.0157

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