On the early stages of localised atmospheric corrosion of magnesium–aluminium alloys
Name
s41598-020-78030-w.pdf
Description
Published version
Size
5.53 MB
Format
Adobe PDF
Checksum (MD5)
3556bc02a3294d0d9326cf046037104c
Author(s)
Shahabi-Navid, M.
Cao, Y.
Svensson, J. E.
Allanore, Antoine
Birbilis, N.
Johansson, L. G.
Esmaily, M.
Date Issued
December 2020
Journal
Scientific Reports
Publisher
Springer Science and Business Media LLC
Citation
Shahabi-Navid, M. et al. "On the early stages of localised atmospheric corrosion of magnesium–aluminium alloys." Scientific Reports 10, 1 (December 2020): 20972. © 2020 The Author(s)
Version
Final published version
Abstract
The surface film on pure magnesium and two aluminium-containing magnesium alloys was characterised after 96 h at 95% RH and 22 °C. The concentration of CO₂ was carefully controlled to be either 0 or 400 ppm. The exposed samples were investigated using X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and electron microscopy. The results showed that when the alloys were exposed to the CO₂-containing environment, aluminium cations (Al³⁺) was incorporated into a layered surface film comprising a partially “hydrated” MgO layer followed by Mg(OH)₂, and magnesium hydroxy carbonates. The results indicated that aluminium-containing magnesium alloys exhibited considerably less localised corrosion in humid air than pure magnesium. Localised corrosion in the materials under investigation was attributed to film thinning by a dissolution/precipitation mechanism.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
MIT Materials Research Laboratory
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1038/s41598-020-78030-w
