ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The oxidation of iron in dry O2 and in wet O2 (40% H2O) has been studied at 600ºC. Theoxide microstructure was investigated by SEM/EDX, FIB and XRD. Iron forms a layered scale indry and wet oxygen at 600ºC. The scale consists of a top hematite layer, a middle magnetite layerand a wüstite layer close to the scale metal interface. All three layers grow with time, but withdifferent growth rates, the overall growth being approximately parabolic. The presence of watervapour increases the rate of oxidation and affects the evolution of the oxide microstructure. Thehigher rate of oxidation in the presence of water vapour is due to an increased growth rate of themagnetite layer and, especially, of the hematite layer, while the growth of the wüstite layer is notaffected. It is suggested that water vapour influences grain boundary transport in the hematite layer
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/20/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.595-598.1005.pdf
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