Investigating the structure of the surface film on a corrosion resistant Mg-Li(-Al-Y-Zr) alloy

Yan, Y, Gharbi, O, Maltseva, A, Chen, X, Zeng, Z, Xu, S, Xu, W, Volovitch, P, Ferry, M and Birbilis, N 2019, 'Investigating the structure of the surface film on a corrosion resistant Mg-Li(-Al-Y-Zr) alloy', Corrosion, vol. 75, no. 1, pp. 80-89.


Document type: Journal Article
Collection: Journal Articles

Title Investigating the structure of the surface film on a corrosion resistant Mg-Li(-Al-Y-Zr) alloy
Author(s) Yan, Y
Gharbi, O
Maltseva, A
Chen, X
Zeng, Z
Xu, S
Xu, W
Volovitch, P
Ferry, M
Birbilis, N
Year 2019
Journal name Corrosion
Volume number 75
Issue number 1
Start page 80
End page 89
Total pages 10
Publisher N A C E International
Abstract The surface film formed on an ultra-lightweight Mg-Li(-Al-Y-Zr) alloy was investigated. Previous research reported that this body-centered cubic (bcc) Mg-Li(-Al-Y-Zr) alloy demonstrated high corrosion resistance that was associated with the formation of a protective lithium carbonate (Li2CO3) surface film. Herein, the surface film that forms upon the bcc Mg-Li(-Al-Y-Zr) alloy following exposure to aqueous chloride containing electrolyte and ambient air was comprehensively studied by complementary methods, to provide a holistic representation of the alloy surface composition and structure. In addition to scanning electron microscopy and transmission electron microscopy of focused ion beam prepared surface cross sections, the composition of the surface film was studied by grazing incidence x-ray diffraction and Raman spectroscopy, both of which revealed Li2CO3 formation on the surface. The surface film structure was also investigated by glow discharge optical emission spectroscopy. The results indicated that a complex and multilayer surface film formed upon Mg-Li(-Al-Y-Zr) following air exposure and when studied ex situ.
Subject Materials Engineering not elsewhere classified
Metals and Alloy Materials
Keyword(s) GDOES
GIXRD
Lithium carbonate
Magnesium
Mg-Li alloy
Raman spectroscopy
Scanning TEM
Surface film
DOI - identifier 10.5006/2995
Copyright notice © 2019 NACE International.
ISSN 0010-9312
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