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Journal of Materials Engineering and Performance

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27-03-2023 | Technical Article

Effects of Micro-arc Oxidation Process Parameters on Micro-structure and Properties of Al₂O₃ Coatings Prepared on Sintered 2024 Aluminum Alloy

Authors: Huanyuan Yan, Wensheng Liu, Yunzhu Ma, Tao Wang, Lei Wu, Lun Yang, Siwei Tang

Published in: Journal of Materials Engineering and Performance | Issue 4/2024

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Abstract

In this work, Al₂O₃ ceramic coatings were prepared the surface of powder metallurgy (PM) 2024 aluminum alloy via the micro-arc oxidation (MAO) technique. The effects of the current density and the oxidation treatment time on the microstructure and properties of the MAO coatings were investigated. The results reveal that the oxide film mainly comprises the γ-Al₂O₃ phase, the amorphous Al₂O₃ phase, and a small amount of the mullite phase. There are traces of W in the coatings, which exist in the form of W, WO₃, and W₁₈O₄₉. With increasing current density, the thickness and surface roughness of the MAO coatings prepared on the PM 2024 alloy increase, while their surface hardness first increases and then decreases. The increase in the current density promotes the transformation of the amorphous Al₂O₃ phase into the γ-Al₂O₃ phase. The maximum hardness value of 1270 HV is obtained at a current density of 20 A dm⁻². The MAO coatings provide superior corrosion protection for the PM 2024 aluminum alloy, and the MAO coatings obtained at a current density of 15 A dm⁻² exhibit the highest corrosion resistance.

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Title: Effects of Micro-arc Oxidation Process Parameters on Micro-structure and Properties of Al2O3 Coatings Prepared on Sintered 2024 Aluminum Alloy
Authors: Huanyuan Yan
Wensheng Liu
Yunzhu Ma
Tao Wang
Lei Wu
Lun Yang
Siwei Tang
Publication date: 27-03-2023
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 4/2024
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-023-08093-z

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