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Effect of permanganate ions on corrosion inhibition of Mg-Al-Mn alloys containing different amounts of Li
Electrochimica Acta ( IF 5.5 ) Pub Date : 2025-01-23 , DOI: 10.1016/j.electacta.2025.145749
Dzmitry S. Kharytonau, Maria A. Osipenko, Jacek Ryl, Janusz Adamiec, Grzegorz Mordarski, Viktoryia Chaprasava, Konrad Skowron, Irina I. Kurilo, Nils Almqvist

Lithium-containing magnesium alloys are promising materials for high-demanding industrial applications. In the present contribution, three different AZ31 magnesium alloys AZ31-xLi (x = 4, 8, and 12 wt.%) were cast and their corrosion processes were examined in 0.05 M NaCl solution utilizing potassium permanganate as a potential corrosion inhibitor. The microstructure of the alloys was analyzed by scanning electron microscopy. Scanning Kelvin probe force microscopy demonstrated high susceptibility of the alloys to localized corrosion attack. Electrochemical techniques showed high effectiveness of the permanganate inhibitor (up to 97 %) at concentrations starting from 10 to 50 mM. Post-corrosion surface analyses allowed establishment of the corrosion inhibition mechanism based on the reduction of permanganate ions on the surface of AZ31-xLi alloys to form an insoluble protective layer of Mn(IV) oxide.

中文翻译:


高锰酸根离子对含不同Li量Mg-Al-Mn合金缓蚀的影响



含锂镁合金是高要求工业应用的有前途的材料。在本贡献中,铸造了三种不同的 AZ31 镁合金 AZ31-x Lix = 4、8 和 12 wt.%),并使用高锰酸钾作为潜在的缓蚀剂在 0.05 M NaCl 溶液中检查了它们的腐蚀过程。通过扫描电子显微镜分析合金的微观结构。扫描开尔文探针力显微镜表明合金对局部腐蚀高度敏感。电化学技术显示,高锰酸盐抑制剂在 10 至 50 mM 的浓度下具有很高的有效性(高达 97%)。腐蚀后表面分析允许建立基于还原 AZ31-x Li 合金表面的高锰酸根离子以形成不溶性 Mn(IV) 氧化物保护层的腐蚀抑制机制。
更新日期:2025-01-23
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