Abstract The present paper reports a quasi-in-situ STEM-EDS approach for studying the role of Ag in the corrosion behaviour of Mg-Gd-Zr alloys. Following corrosion, the segregation of O at the interface of the α-Mg matrix and the β phase was observed. Furthermore, Ag-rich particles and the re-deposition of Ag were also observed on the nanoscale. Based on quasi-in-situ STEM-EDS observations herein, the partitioning of Ag into the β phase leads to enhanced localised corrosion, whilst the subsequent formation of Ag-rich particles during the corrosion process leads to enhanced rate of corrosion propagation, with accompanying oxy-hydroxide formation observed upon the Mg-Gd-Ag-Zr.

中文翻译：

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准原位 STEM-EDS 洞察 Ag 在 Mg-Gd-Zr 合金腐蚀行为中的作用

摘要 本文报道了一种用于研究 Ag 在 Mg-Gd-Zr 合金腐蚀行为中的作用的准原位 STEM-EDS 方法。腐蚀后，观察到 O 在 α-Mg 基体和 β 相界面处的偏析。此外，在纳米尺度上还观察到富银颗粒和银的再沉积。基于本文的准原位 STEM-EDS 观察，Ag 分配到 β 相导致局部腐蚀增强，而在腐蚀过程中随后形成的富 Ag 颗粒导致腐蚀传播速度加快，伴随着在 Mg-Gd-Ag-Zr 上观察到羟基氧化物的形成。