On the in-situ aqueous stability of an Mg-Li-(Al-Y-Zr) alloy: role of Li

Y.M. Yan, A. Maltseva, P. Zhou, X.J. Li, Z. R. Zeng, O. Gharbi, K. Ogle, M. La Haye, M. Vaudescal, M. Esmaily, N. Birbilis, P. Volovitch

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Abstract

The aqueous stability of a corrosion resistant Mg-Li(-Al-Y-Zr)-alloy was investigated by combining in-situ confocal Raman Microscopy, Atomic Emission SpectroElectroChemistry, ex-situ Photoluminiscence Spectroscopy, Auger Electron Spectroscopy and Glow Discharge Optical Emission Spectroscopy. Li and Mg dissolved from visually intact anodic areas, leaving a Li-depleted metallic layer under approximately 100 nm thick Li-doped MgO. The transformation MgO→Mg(OH)2 was inhibited. Li2[Al2(OH)6]2·CO3·nH2O, LiAlO2, Y2O3 and Mg(OH)2 accumulated locally around active cathodic sites. New corrosion mechanism is proposed, which associates the improved corrosion resistance of Mg-Li alloys with an enhanced chemical stability and modified catalytic activity of MgO in presence of Li+.

Original languageEnglish
Article number108342
Number of pages13
JournalCorrosion Science
Volume164
DOIs
Publication statusPublished - Mar 2020

Keywords

  • A. Magnesium
  • B. AES (Auger spectroscopy)
  • B. ICP-OES
  • B. In-situ Raman spectroscopy
  • C. Interfaces
  • C. Neutral inhibition

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