The effects of three corrosion inhibitors on Mg-Zn-Y-Nd alloy corrosion fatigue were investigated. Salicylic acid (SA) induces uniform but rapid corrosion, limiting fatigue life improvement. 2, 6-pyridinedicarboxylic acid (2,6-PDCA) delays crack initiation under low stress yet fails to fully suppress localized corrosion. Paeonol condensed cysteine Schiff base (PCCys) significantly inhibits both uniform corrosion and localized attacks, enhancing corrosion fatigue life. Localized corrosion behavior, rather than isolated corrosion rate metrics, critically determines mechanical performance under combined corrosive-dynamic stress conditions. A multi-parameter evaluation framework integrating localized corrosion, corrosion rate, and stress effects is proposed for practical screening of corrosion inhibitors for magnesium alloys.

This study produced wide (900–1200 mm) AZ31 alloy sheets with varying thicknesses via continuous casting direct rolling (7 mm, 6 mm) combined with stepwise warm rolling (4.5 mm, 2 mm), examining the effects of this process on microstructure, corrosion durability, mechanical properties, and discharge properties. Results showed that the reduced thickness significantly refined the grain size from 131.20 µm to 7.90 µm with the basal texture intensity reached 52%. Synergistic grain refinement, dislocation, and texture strengthening improved the yield strength (YS), ultimate tensile strength (UTS), and elongation (EL) of the 2 mm-thick sheet by 59.11%, 39.75%, and 83.52%, respectively, compared to those of the 7 mm-thick sheet. Corrosion durability was also improved, with a corrosion rate of 2.19 mm·y⁻¹ for the 2 mm sheet, which was 41% lower than that of the 7 mm sheet (3.72 mm·y⁻¹), due to the formation of a dense Al(OH)₃ and layered double hydroxide corrosion film with mitigated micro-galvanic corrosion. As an Mg-air battery anode, the 2 mm sheet performed the best at 10 mA/cm², achieving an anode efficiency of 61.18%, specific energy of 1660.50 mWh·g⁻¹, easy discharge product detachment, and reduced self-corrosion. In summary, this study demonstrates a cost-effective and industrially viable approach that combines continuous casting direct rolling with stepwise warm rolling to produce ultra-wide AZ31 sheets with simultaneously improved overall properties, offering a novel strategy to expand the opportunity for commercial Mg alloys in both structural and functional applications.

Magnesium alloys hold promise as biodegradable orthopedic implants but suffer from rapid corrosion and poor corrosion fatigue performance. This study evaluates the efficacy of a micro-arc oxidation (MAO) layer combined with 3-glycidyloxypropyltrimethoxysilane (GPTMS) sealing in enhancing the corrosion fatigue behavior of ZE21B magnesium alloy in Hanks’ Balanced Salt Solution (HBSS). Electrochemical testing revealed a two-order-of-magnitude reduction in corrosion current density compared to bare alloy, while immersion tests demonstrated sustained protection against degradation. Corrosion fatigue experiments under cyclic loading showed stress-dependent performance: the composite coating improved fatigue life at low stress amplitudes (60 MPa) by mitigating corrosion pit formation, but interfacial weakness between GPTMS and MAO layers reduced performance at high stresses (90–80 MPa). Fractographic analysis identified asynchronous deformation and stress gradient-dependent coating spallation as key failure modes. These results provide mechanistic insights into coating degradation pathways and offer design strategies for developing robust surface modification systems to advance magnesium-based orthopedic applications.

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.