On the early stages of localised atmospheric corrosion of magnesium–aluminium alloys
Author(s)Shahabi-Navid, M.; Cao, Y.; Svensson, J. E.; Allanore, Antoine; Birbilis, N.; Johansson, L. G.; Esmaily, M.; ... Show more Show less
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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.
DepartmentMassachusetts Institute of Technology. Department of Materials Science and Engineering; MIT Materials Research Laboratory
Springer Science and Business Media LLC
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)
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