Exfoliation Corrosion of As-Extruded Mg–1Li–1Ca: the Influence of the Superficial Layer

IF 2.9 2区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Acta Metallurgica Sinica-English Letters Pub Date : 2024-05-06 DOI:10.1007/s40195-024-01708-x

Ze-Song Wei, Zi-You Ding, Lei Cai, Shao-Xia Ma, Dong-Qing Zhao, Lan-Yue Cui, Cheng-Bao Liu, Yuan-Sheng Yang, Yuan-Ding Huang, Rong-Chang Zeng

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Abstract

Exfoliation corrosion (EFC) has rarely been reported for wrought magnesium alloys. Enhanced EFC of the as-extruded Mg–1Li–1Ca alloy was observed after the removal of outermost fine-grained skins. The microstructure and corrosion products were investigated using optical microscopy, scanning electron microscopy, electron backscattered diffraction, X-ray diffraction, and Fourier transform infrared spectrometry. The corrosion behavior was analyzed using electrochemical polarization, electrochemical impedance spectroscopy, and scanning Kelvin probe techniques. The results indicated that the surface of Mg–1Li–1Ca, with the superficial layer removed, was more susceptible to EFC. A linear correlation between grain boundary density and corrosion resistance was established. Additionally, the influence of factors such as grain size, intermetallic compounds, different alloy surfaces, and corrosion products on EFC were discussed, and the corresponding EFC mechanism was clarified.

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挤压成型的 Mg-1Li-1Ca 的剥落腐蚀：表层的影响

关于锻造镁合金剥落腐蚀（EFC）的报道很少。在去除最外层的细晶粒表皮后，观察到挤压成型的 Mg-1Li-1Ca 合金的 EFC 增强。使用光学显微镜、扫描电子显微镜、电子反向散射衍射、X 射线衍射和傅立叶变换红外光谱分析了微观结构和腐蚀产物。使用电化学极化、电化学阻抗光谱和扫描开尔文探针技术分析了腐蚀行为。结果表明，除去表层的 Mg-1Li-1Ca 表面更容易受到 EFC 的影响。晶界密度与耐腐蚀性之间建立了线性关系。此外，还讨论了晶粒大小、金属间化合物、不同合金表面和腐蚀产物等因素对 EFC 的影响，并阐明了相应的 EFC 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.