Optimization Study of Compound Electrolytes for Aluminum Alloy Micro-Arc Oxidation

WANG Jun, FENG Jun, JIN Fanya, ZHAO Yingchao, YANG Xudong, YUAN Shaohua, QI Huarong

doi:10.16577/j.issn.1001-1560.2024.0136

Materials Protection >

2024 , Vol. 57 >Issue 6: 131 - 138

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0136

Optimization Study of Compound Electrolytes for Aluminum Alloy Micro-Arc Oxidation

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(1.School of Mechanical Engineering, University of South China, Hengyang 421001, China;2.Southwest Institute of Physics of Nuclear Industry, Chengdu 610041, China)

FENG Jun (1979-), Ph.D., Associate Professor, Research Focus: Low-Temperature Plasma Technology and Applications, Tel.: 15096080669, E-mail: speedfjkang@163.com;; JIN Fanya (1979-), Ph.D., Researcher, Research Focus: Plasma Applications, Tel.: 028-82820933, E-mail: yafanjin@163.com

Received date: 2023-11-27

Revised date: 2024-01-06

Accepted date: 2024-01-25

Online published: 2024-06-24

Supported by

National Natural Science Foundation of China (52305313)

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Abstract

For obtaining a thick ceramic coating with good film-forming and wear resistance, a new type of composite electrolyte was composed of sodium phosphate and sodium hexametaphosphate as the basic electrolytes, while sodium tungstate and sodium tetraborate were added as additives. In this composite electrolyte system, micro-arc oxidation treatment was performed on 1060 aluminum alloy. Using the coating thickness and surface porosity as optimization indicators, the electrolyte formula was optimized using the L₉(3⁴) orthogonal test. Meanwhile, the microstructure, surface porosity, phase composition, thickness, microhardness and wear resistance of ceramic coatings prepared under this electrolyte formula were studied systematically. Results showed that the ceramic coating prepared with a formula of Na₃PO₄ concentration of 32.0 g/L, Na₂B₄O₇ concentration of 16.0 g/L, Na₂WO₄ concentration of 4.5 g/L and(NaPO₃)₆ concentration of 30.0 g/L had the structure with uniform micropores and dense film layer, the thickness of 22.8 μm, the porosity of 3.86%, and the microhardness of 475 HV. Furthermore, the wear resistance of the coating was significantly improved compared to the substrate, and the ceramic coating were mainly composed of γ-Al₂O₃ and a small amount of α-Al₂O₃ composition.

Key words： aluminum alloy; micro-arc oxidation; orthogonal experiment; alumina ceramic coating

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WANG Jun, FENG Jun, JIN Fanya, ZHAO Yingchao, YANG Xudong, YUAN Shaohua, QI Huarong . Optimization Study of Compound Electrolytes for Aluminum Alloy Micro-Arc Oxidation[J]. Materials Protection, 2024 , 57(6) : 131 -138 . DOI: 10.16577/j.issn.1001-1560.2024.0136

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