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Corrosion of magnesium in humid air
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2004 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 46, no 5, 1141-1158 p.Article in journal (Refereed) Published
Abstract [en]

The influence of ambient concentrations of carbon dioxide on the atmospheric corrosion of magnesium has been studied by atomic force microscopy (AFM) and scanning electron microscopy (SEM), revealing the development and growth of corrosion products. The surfaces investigated by AFM were prepared by ultramicrotomy, using a diamond knife, to generate a smooth finish without using water or lubricant. Sputter-deposited Mg films were also studied with mechanically polished samples used to monitor the overall corrosion process. The exposures were performed at 22.0 degreesC in a synthetic environment with precise control of relative humidity (95%) and CO2 (0 or 350 ppm). Corrosion is localized in the absence of CO2 and is related to noble inclusions in the metal matrix. After corrosion product removal, relatively deep pits are evident. In contrast, pitting is inhibited in the presence of CO, with relatively uniform corrosion product development; further, the noble inclusions have no effect on the distribution of corrosion. The inhibitive effect of CO2 is also observed in the long-term exposures, showing that CO2 reduces the average corrosion rate. Mechanisms are introduced to explain the effects of CO2 and the roles of the noble inclusions on the corrosion behaviour.

Place, publisher, year, edition, pages
2004. Vol. 46, no 5, 1141-1158 p.
Keyword [en]
magnesium, atmospheric corrosion, AFM, CO2, impurity, atmospheric corrosion, aluminum, alloys, morphology, vietnam, copper, nacl
URN: urn:nbn:se:kth:diva-23325ISI: 000220778000008OAI: diva2:342023
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Lindström, Rakel
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