Improving the corrosion resistance of MgZn1.2GdxZr0.18 (x =0, 0.8, 1.4, 2.0) alloys via Gd additions

Siqi Yin, Wenchao Duan, Wenhong Liu, Liang Wu, Jiaxin Bao, Jiamin Yu, Liang Li, Zhong Zhao, Jianzhong Cui, Zhiqiang Zhang

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)
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Abstract

Effects of Gd addition on microstructure, corrosion behavior and mechanism of cast and extruded MgZn1.2GdxZr0.18 alloys are investigated through microstructure observation, weight loss and electrochemical tests. Increasing Gd from 0 to 2.0 at.%, grains are refined, MgZn2 phase, W-phase and X-phase are formed successively, and basal texture intensity is decreased. The significantly decreased grain size by extrusion and Gd addition induces formation of protective Gd2O3 and MgO layer. The extruded MgZn1.2Gd2.0Zr0.18 alloy shows decreased corrosion rate of 3.72 ± 0.36 mm/year, owing to fine and homogeneous microstructure, dual-role (micro-anode and barrier) of X-phase, compact oxidation layer and basal crystallographic texture.
Original languageEnglish
Article number108962
JournalCorrosion Science
Volume177
Early online date20 Aug 2020
DOIs
Publication statusPublished - 1 Dec 2020

Keywords

  • A. Magnesium
  • A. Rare earth elements
  • B. Polarization
  • B. XPS
  • C. Intergranular corrosion
  • C. Passive films

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