Synergistic inhibition effect of fluoride and caffeiate on LAZ931 Mg alloy corrosion

作者：Yishun Tian, Tiancai Kong, Shuya Mao, Di Mei, Zhipeng Liu, Jinxue Liu, Yang Xiao, Liguo Wang, Shijie Zhu, Shaokang Guan · 发表于：Journal of Magnesium and Alloys · 年份：2025 · DOI：10.1016/j.jma.2025.03.015 · 被引用次数：6 · 研究领域：Magnesium Alloys: Properties and Applications、Corrosion Behavior and Inhibition、Hydrogen Storage and Materials

• Sodium fluoride (NaF) and caffeic acid (CA) enhance the corrosion resistance of LAZ931 alloy. • A dense NaMgF₃ protective layer results in the improved corrosion resistance. • The synergistic inhibition mechanism of NaF and CA was elucidated. Improving the corrosion resistance of magnesium-lithium (Mg-Li) alloys is pivotal for expanding their prospective utilization in lightweight structural materials. This research focused on evaluating the corrosion inhibition effectiveness of a composite corrosion inhibitor comprising sodium fluoride (NaF) and caffeic acid (CA) on the LAZ931 alloy in a 3.5 wt.% NaCl solution. The results demonstrated that NaF alone is insufficient to prevent localized corrosion of the alloy. Remarkably, the addition of 0.001 M caffeic acid to a 0.05 M NaF solution significantly increased the corrosion inhibition efficiency from 54.36 % to 88 %. This substantial improvement in corrosion resistance can be credited to the formation of the dense protective NaMgF 3 deposition products on the sample surface. This study offers a novel approach to the design of corrosion inhibitors for duplex Mg alloys, emphasizing the synergistic effect between NaF and CA in augmenting corrosion protection.