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The Initial Stages of Atmospheric Corrosion of Iron in a Saline Environment Studied with Time-Resolved In Situ X-Ray Transmission Microscopy
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Corrosion Science.ORCID iD: 0000-0003-2100-8864
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Corrosion Science.ORCID iD: 0000-0002-9453-1333
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2010 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, Vol. 157, no 3, C110-C115 p.Article in journal (Refereed) Published
Abstract [en]

We have investigated atmospheric corrosion of a 50 nm layer of iron covered with a thin layer of NaCl by in situ X-ray transmission spectromicroscopy. We find that upon its deliquescence, a small part of the NaCl layer is rapidly transformed into a sodium oxide (NaOH) species. A large part of the sodium and chlorine ions forms a concentrated solution on the iron surface and becomes segregated, whereby the sodium ions appear stationary and passive during further corrosion progression. In contrast, the chlorine ions appear highly mobile and become concentrated at and travel with the corrosion front, apparently acting as a corrosion catalyst. The corrosion front progression is partly of filiform and partly of radial type. The early iron corrosion products (chloride-containing oxyhydroxides) are short-lived (for some hours) and undergo a transformation as the corrosion front sweeps by from a chlorinated species to a less chlorinated species.

Place, publisher, year, edition, pages
2010. Vol. 157, no 3, C110-C115 p.
National Category
Inorganic Chemistry
URN: urn:nbn:se:kth:diva-19183DOI: 10.1149/1.3274207ISI: 000274321900044ScopusID: 2-s2.0-76349106722OAI: diva2:337230
Swedish Research Council
QC 20110125Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-01-25Bibliographically approved

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Hedberg, JonasLeygraf, Christofer
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