Abstract Electrochemical behavior of two Metal-Metal glassy alloys Fe78Co9Cr10Mo2Al1 (VX9) and Fe49Co49V2 (VX50) (at.%) were investigated at different immersion times in artificial acid rain at 20 °C using electrochemical techniques as electrochemical impedance spectroscopy (EIS) and cyclic polarization (CP). The morphology and composition of alloy surface were investigated using X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX) measurements and atomic force microscopy (AFM). VX9 alloy has high corrosion resistance more than VX50 due to good protective elements as Cr 10% that create chromium oxide. Immersion measurements during (0.5–12 h) reveal the critical time for VX9 alloy is about 3 h to begin corrosion resistance while the VX50 alloy take a longer time to form protective film. The susceptibility of studied alloys for localized corrosion was observed by cyclic-polarization data due to passive film of two layers (inner compact and outer prose). The VX50 alloy has low value of charge transfer resistance due to exposure to more pitting attack. The AFM and SEM images found that average surface roughness (Ra) of VX9 alloy is lower than VX50 alloy.

中文翻译：

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浸泡时间对酸雨中新型 Fe-Co 金属-金属玻璃合金电化学和形貌的影响

摘要 使用电化学阻抗谱 (EIS) 和循环电化学技术研究了两种金属-金属玻璃合金 Fe78Co9Cr10Mo2Al1 (VX9) 和 Fe49Co49V2 (VX50) (at.%) 在 20 °C 人工酸雨中不同浸泡时间下的电化学行为。极化（CP）。使用 X 射线光电子能谱 (XPS)、扫描电子显微镜 (SEM)、能量色散 X 射线光谱 (EDX) 测量和原子力显微镜 (AFM) 研究合金表面的形貌和成分。VX9 合金具有比 VX50 更高的耐腐蚀性，因为它具有良好的保护元素，如 Cr 10% 会产生氧化铬。在 (0. 5-12 小时）表明 VX9 合金开始抗腐蚀的关键时间约为 3 小时，而 VX50 合金需要更长的时间形成保护膜。由于两层（内部紧凑和外部散文）的钝化膜，通过循环极化数据观察了所研究合金对局部腐蚀的敏感性。由于暴露于更多的点蚀，VX50 合金的电荷转移电阻值较低。AFM 和 SEM 图像发现 VX9 合金的平均表面粗糙度 (Ra) 低于 VX50 合金。