Preparation and Corrosion Resistance Mechanism of Magnesium–Lithium Alloy Micro-arc Oxidation/Quaternary LDHs@GO Self-healing Composite Film

IF 3.9 2区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Acta Metallurgica Sinica-English Letters Pub Date : 2025-07-03 DOI:10.1007/s40195-025-01892-4

Zhenzhen Tian, Rongqian Wu, Fubing Yu, Yan Zhou, Wenhui Yao, Yuan Yuan, Zhihui Xie, Yanlong Ma, Atrens Andrej, Liang Wu

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Abstract

Micro-arc oxidation (MAO) film can only provide common mechanical protection for magnesium (Mg)–lithium (Li) alloys. These alloys are susceptible to severe localized corrosion, if the MAO film is disrupted. This work reports the successful hydrothermal preparation of a MgLiAlCe-LDHs@GO film on a MAO-coated Mg–Li alloy following Ce confinement. The graphene oxide (GO) sheet increased the diffusion path of the corrosive media, and the addition of rare-earth cerium ions (Ce³⁺) endowed the film with a certain self-healing ability, which significantly improved the corrosion resistance of the film, and the corrosion current density (i_corr) reached 3.27 × 10⁻⁸ A cm⁻². The synergistic action of GO and Ce³⁺ can achieve long-term corrosion protection for the substrate. The corrosion resistance mechanism of MgLiAlCe-LDHs@GO film was discussed by the scanning vibration electrode technique (SVET).

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镁锂合金微弧氧化/季系LDHs@GO自愈复合膜的制备及其耐腐蚀机理

微弧氧化（MAO）膜只能为镁(Mg) -锂（Li）合金提供普通的机械保护。如果MAO膜被破坏，这些合金容易受到严重的局部腐蚀。这项工作报道了成功的水热法制备MgLiAlCe-LDHs@GO薄膜的mao涂层镁-锂合金后，Ce约束。氧化石墨烯（GO）片增加了腐蚀介质的扩散路径，稀土铈离子（Ce3+）的加入使膜具有一定的自愈能力，显著提高了膜的耐蚀性，腐蚀电流密度（icorr）达到3.27 × 10−8 a cm−2。氧化石墨烯和Ce3+的协同作用可以实现对基体的长期防腐。采用扫描振动电极技术（SVET）探讨了MgLiAlCe-LDHs@GO膜的耐腐蚀机理。

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来源期刊

Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

6.60

自引率

14.30%

发文量

122

审稿时长

2 months

期刊介绍： This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.