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

IF 14.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Science & Technology Pub Date : 2025-04-23 DOI:10.1016/j.jmst.2025.03.039

Tiancai Kong, Jiayi Tong, Mengmeng Yue, Di Mei, Yishun Tian, Zhipeng Liu, Jinxue Liu, Jianfeng Wang, Yang Xiao, Shijie Zhu, Liguo Wang, Shaokang Guan

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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.

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咖啡酸诱导的NaMgF3微弧氧化膜封孔，提高了LAZ931镁合金的耐腐蚀性能和紫外光学性能

镁锂合金的耐腐蚀性有限，限制了其应用。本研究通过两步工艺，包括MAO预处理和咖啡酸诱导的NaMgF3化学沉积，研究了MAO/NaMgF3复合涂层对LAZ931合金耐蚀性的增强。耐蚀性能的增强主要归功于MAO涂层的均匀化和NaMgF3在Mg表面的原位密封。咖啡酸的掺入促进了NaMgF3的形成。此外，观察到经过该复合涂层处理的样品表现出强大的紫外光吸收能力，并且在近紫外光激发下可以发射可见光。这种独特的特性扩展了这种涂层技术在航空航天工业中的潜在应用。本研究为镁合金复合涂层的设计和制备提供了新的思路，对扩大镁锂合金的应用范围具有重要意义。

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来源期刊

Journal of Materials Science & Technology 工程技术-材料科学：综合

CiteScore

20.00

自引率

11.00%

发文量

995

审稿时长

13 days

期刊介绍： Journal of Materials Science & Technology strives to promote global collaboration in the field of materials science and technology. It primarily publishes original research papers, invited review articles, letters, research notes, and summaries of scientific achievements. The journal covers a wide range of materials science and technology topics, including metallic materials, inorganic nonmetallic materials, and composite materials.