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An ESEM in situ investigation of the influence of H2O on iron oxidation at 500 degrees C
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Metallografi.ORCID-id: 0000-0002-4521-6089
Vise andre og tillknytning
2009 (engelsk)Inngår i: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 51, nr 9, s. 1914-1924Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The initial oxidation of iron and the effect of different O-2/H2O mixtures have been investigated through ESEM in situ exposure and analysis at 500 degrees C. In dry and wet air a two-layered magnetite forms beneath a thin, fine-grained hematite layer. while only a two-layered magnetite forms in H2O. The two-layered magnetite is separated by a straight interface (in all environments), which is suggested to be the original metal surface. The presence of low levels of water vapour (similar to 1% H2O) produces a thicker hematite layer (compared to dry air), exhibiting a large number of whiskers. At least four different factors are suggested to influence the local growth rate: the surface of the metal grain, the thickness of the hematite layer, the oxide grain size and the exposure environment. The ESEM in situ exposures have in addition been shown to have high quality and reproducibility.

sted, utgiver, år, opplag, sider
2009. Vol. 51, nr 9, s. 1914-1924
Emneord [en]
Iron, ESEM in situ exposure, FIB, High temperature corrosion, Oxidation, high-temperature oxidation, growth
Identifikatorer
URN: urn:nbn:se:kth:diva-18736DOI: 10.1016/j.corsci.2009.05.016ISI: 000269597000006Scopus ID: 2-s2.0-68049097015OAI: oai:DiVA.org:kth-18736DiVA, id: diva2:336783
Merknad
QC 20100525Tilgjengelig fra: 2010-08-05 Laget: 2010-08-05 Sist oppdatert: 2017-12-12bibliografisk kontrollert

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