通过新型核壳结构 Al8Mn4Y-Al2Ca 和可控溶质偏析提高 Mg-Al-Mn-Ca-Y 稀合金的耐腐蚀性能

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys Pub Date : 2025-01-01 DOI:10.1016/j.jma.2023.10.009

Xiaorui Dong , Min Zha , Dawei Wang , Siqing Wang , Yajie Yang , Hailong Jia

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引用次数: 0

摘要

在稀镁-0.6Al-0.5Mn-0.1Ca-0.1Y 合金（重量百分比）中，通过双辊铸造过程中的不完全包晶转变，精心设计了一种新型核壳结构 Al8Mn4Y-Al2Ca 相和可控的溶质分离。在 3.5 wt.% 的 NaCl 溶液中浸泡时，电化学电位较低的 Al2Ca 壳阻止了惰性 Al8Mn4Y 与镁基体的直接接触，减轻了微电蚀作用，同时加速了均匀腐蚀膜的形成。此后，溶质（Al、Ca）偏析促使形成异质多层腐蚀产物膜，增强了耐腐蚀性，甚至在长期腐蚀后实现了自修复。值得注意的是，稀镁合金的腐蚀速率低至 0.22 ± 0.05 mm-y-1。

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Enhancing corrosion resistance of Mg-Al-Mn-Ca-Y dilute alloy via novel core-shell structured Al8Mn4Y-Al2Ca and controllable solute segregation

A novel core-shell structured Al₈Mn₄Y-Al₂Ca phase and controllable solute-segregation are elaborately designed in dilute Mg-0.6Al-0.5Mn-0.1Ca-0.1Y alloy (wt.%), via incomplete peritectic transformation during twin-roll casting. When soaked in 3.5 wt.% NaCl solution, Al₂Ca shell with a low electrochemical potential prevents direct contact of noble Al₈Mn₄Y with Mg matrix, mitigating the micro-galvanic corrosion and meanwhile accelerating the formation of uniform corrosion film. Thereafter, solute (Al, Ca)-segregation motivates the formation of heterogeneous multilayered corrosion product films, enhancing corrosion resistance and even achieving self-healing upon long-term corrosion. Notably, the dilute Mg alloy exhibits a corrosion rate as low as 0.22 ± 0.05 mm·y⁻¹.

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来源期刊

Journal of Magnesium and Alloys Engineering-Mechanics of Materials

CiteScore

20.20

自引率

14.80%

发文量

审稿时长

59 days

期刊介绍： The Journal of Magnesium and Alloys serves as a global platform for both theoretical and experimental studies in magnesium science and engineering. It welcomes submissions investigating various scientific and engineering factors impacting the metallurgy, processing, microstructure, properties, and applications of magnesium and alloys. The journal covers all aspects of magnesium and alloy research, including raw materials, alloy casting, extrusion and deformation, corrosion and surface treatment, joining and machining, simulation and modeling, microstructure evolution and mechanical properties, new alloy development, magnesium-based composites, bio-materials and energy materials, applications, and recycling.