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 NaMgF₃ 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.

The degradation of Mg alloys relates to the service performance of Mg alloy biodegradable implants. In order to investigate the degradation behavior of Mg alloys as vascular stent materials in the near service environment, the hot-extruded fine-grained Mg-Zn-Y-Nd alloy microtubes, which are employed to manufacture vascular stents, were tested under radial compressive stress in the dynamic Hanks’ Balanced Salt Solution (HBSS). The results revealed that the high flow rate accelerates the degradation of Mg alloy microtubes and its degradation is sensitive to radial compressive stress. These results contribute to understanding the service performance of Mg alloys as vascular stent materials.