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Application of X-ray diffraction to studies of high temperature corrosion of iron

Anwendung der Röntgenbeugung auf die Untersuchung der Hochtemperaturkorrosion von Eisen

Delhez, R.; Mittemeijer, E.J.:
EPDIC 2. Proceedings of the Second European Powder Diffraction Conference 1992. Vol.2
Aedermannsdorf: Trans Tech Publications, 1993 (Materials science forum 133/136)
ISBN: 0-87849-661-0
European Powder Diffraction Conference (EPDIC) <2, 1992, Enschede>
Fraunhofer ICT ()
corrosion product; high temperature corrosion; in-situ method; oxid layer; oxidation; steel; x-ray diffraction

Temperature resolved X-ray diffraction was applied to studies of high temperature oxidation of steel between 100 and 1400 degree Celsius in air. With the measured series of diffraction patterns the formation of the oxide layers can be followed in situ. The observed diffraction peaks allow the identification of the oxides. Peak intensities, lattice plane distances and lattice parameters of the base material and the oxides were calculated as a function of the temperature. The difference method together with microscopic determination of the end thickness of the oxide layer yields the kinetic parameters. Evaluating the diffraction peaks of each oxide separately yields the rate constants for the single iron oxide layers. The measuring system consists of an X-ray diffractometer and a high temperature device with programmable temperature controller for temperature from 20 to 1700 degree Celsius. The measurements are performed by means of a position sensitive proportional counter, or a scintil lation counter. These detectors allow measuring times of 60 to 240 s per pattern yielding series of 300 diffraction patterns on one day.