The influence of H2O on iron oxidation at 600?C: a microstructural study.
Artikel i vetenskaplig tidskrift, 2008

The oxidation of iron in dry O2 and in wet O2 (40% H2O) has been studied at 600°C. The oxide microstructure was investigated by SEM/EDX, FIB and XRD. Iron forms a layered scale in dry and wet oxygen at 600°C. The scale consists of a top hematite layer, a middle magnetite layer and a wüstite layer close to the scale metal interface. All three layers grow with time, but with different growth rates, the overall growth being approximately parabolic. The presence of water vapour increases the rate of oxidation and affects the evolution of the oxide microstructure. The higher rate of oxidation in the presence of water vapour is due to an increased growth rate of the magnetite layer and, especially, of the hematite layer, while the growth of the wüstite layer is not affected. It is suggested that water vapour influences grain boundary transport in the hematite layer.

Författare

Torbjörn Jonsson

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

Bagas Pujilaksono

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Anne Fuchs

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

Jan-Erik Svensson

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Lars-Gunnar Johansson

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Mats Halvarsson

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

Materials Science Forum

0255-5476 (ISSN)

Vol. 595-598 1005-1012

Ämneskategorier

Annan materialteknik

DOI

10.4028/www.scientific.net/MSF.595-598.1005