Enhanced corrosion resistance and UV optical performance of LAZ931 Mg alloy through pore sealing of micro-arc oxidation coating by caffeic acid-induced NaMgF3 deposition

doi:10.1016/j.jmst.2025.03.039

Abstract

Abstract: The limited corrosion resistance of Mg-Li alloys restricts their applications. This study investigates the enhancement of corrosion resistance in LAZ931 alloy through the application of a composite MAO/NaMgF₃ coating via a two-step process, encompassing MAO pretreatment followed by caffeic acid-induced NaMgF₃ chemical deposition. The enhanced corrosion resistance is attributed to the homogenization of the MAO coating and the in-situ sealing of pores by NaMgF₃ on the Mg surface. The incorporation of caffeic acid facilitates the formation of NaMgF₃. Furthermore, it is observed that samples treated with this composite coating demonstrate robust ultraviolet light absorption capabilities and can emit visible light when excited by near-ultraviolet light. This unique characteristic expands the potential applications of this coating technology in the aerospace industry. This research offers novel perspectives on the design and preparation of composite coatings for magnesium alloys, holding great promise for broadening the application scope of Mg-Li alloys.

Key words: Mg-Li alloy, MAO, NaMgF₃, Composite coating, Caffeic acid, Corrosion

Tiancai Kong, Jiayi Tong, Mengmeng Yue, Di Mei, Yishun Tian, Zhipeng Liu, Jinxue Liu, Jianfeng Wang, Yang Xiao, Shijie Zhu, Liguo Wang, Shaokang Guan. Enhanced corrosion resistance and UV optical performance of LAZ931 Mg alloy through pore sealing of micro-arc oxidation coating by caffeic acid-induced NaMgF₃ deposition[J]. J. Mater. Sci. Technol., 2025, 238: 155-166.

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Enhanced corrosion resistance and UV optical performance of LAZ931 Mg alloy through pore sealing of micro-arc oxidation coating by caffeic acid-induced NaMgF₃ deposition

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