Tracking the corrosion of magnesium sand cast AM50 alloy in chloride environments

•Corrosion depth of individual α-grains on AM50 Mg alloys dependent on Al content.•Al–Mn intermetallics within grains accelerate corrosion rate irrespective of Al-content.•Presence of Al-rich layer at alloy surface in corrosion resistant region identified.•Heavy corrosion damage observed in Al-deple...

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Bibliographic Details
Published in:Corrosion science 2013-10, Vol.75, p.114-122
Main Authors: Asmussen, R. Matthew, Jakupi, Pellumb, Danaie, Mohsen, Botton, Gianluigi A., Shoesmith, David W.
Format: Article
Language:English
Subjects:
A. Alloy
A. Magnesium
Alloy development
Aluminum
Applied sciences
B. SEM
B. TEM
Chlorides
Confocal laser scanning microscopy
Corrosion
Corrosion environments
Exact sciences and technology
Magnesium
Magnesium base alloys
Metals. Metallurgy
Sand
Tracking
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Summary:•Corrosion depth of individual α-grains on AM50 Mg alloys dependent on Al content.•Al–Mn intermetallics within grains accelerate corrosion rate irrespective of Al-content.•Presence of Al-rich layer at alloy surface in corrosion resistant region identified.•Heavy corrosion damage observed in Al-depleted regions in short immersion times (2h). An experimental procedure for tracking corrosion on lightweight alloys has been developed using a combination of microscopy and corrosion studies using commercial sand cast magnesium AM50 alloys. Corrosion penetration depths were measured and characterized with CLSM and SEM/XEDS, respectively. Corrosion depths on α-grains in the alloys were expressed as a function of their Al content. Al-rich β-phases and eutectic α-phase microstructures were observed to be most corrosion resistant due to an enrichment of Al, identified with TEM, near the oxide/alloy interface. Sand cast alloys were found to be susceptible to major corrosion events in regions with depleted Al content.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2013.05.022