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Título

Correlation between the surface chemistry and the atmospheric corrosion of AZ31, AZ80 and AZ91D magnesium alloys

Autor Feliu Jr., S.; Pardo, A.; Merino, M. C.; Coy, A. E.; Viejo, F.; Arrabal, R.
Palabras clave Magnesium/aluminium alloys
XPS
Corrosion
Humidity
Fecha de publicación 2009
EditorElsevier
Citación Applied Surface Science 255(7): 4102-4108 (2009)
ResumenX-ray photoelectron spectroscopy (XPS) was used in order to investigate the correlation between the surface chemistry and the atmospheric corrosion of AZ31, AZ80 and AZ91D magnesium alloys exposed to 98% relative humidity at 50 °C. Commercially pure magnesium, used as the reference material, revealed MgO, Mg(OH)2 and tracers of magnesium carbonate in the air-formed film. For the AZ80 and AZ91D alloys, the amount of magnesium carbonate formed on the surface reached similar values to those of MgO and Mg(OH)2. A linear relation between the amount of magnesium carbonate formed on the surface and the subsequent corrosion behaviour in the humid environment was found. The AZ80 alloy revealed the highest amount of magnesium carbonate in the air-formed film and the highest atmospheric corrosion resistance, even higher than the AZ91D alloy, indicating that aluminium distribution in the alloy microstructure influenced the amount of magnesium carbonate formed
Versión del editorhttp://dx.doi.org/10.1016/j.apsusc.2008.10.095
URI http://hdl.handle.net/10261/96317
DOI10.1016/j.apsusc.2008.10.095
ISSN0169-4332
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