Quasi-in-situ STEM-EDS insight into the role of Ag in the corrosion behaviour of Mg-Gd-Zr alloys

Yu Zhang, Poorwa Gore, Wei Rong, Yujuan Wu, Yuanming Yan, Ruifeng Zhang, Liming Peng, Jian-Feng Nie, Nick Birbilis

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24 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)106-118
Number of pages13
JournalCorrosion Science
Volume136
DOIs
Publication statusPublished - 15 May 2018

Keywords

  • A. Magnesium
  • B. STEM
  • C. Anodic dissolution
  • C. De-alloying
  • C. Segregation

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