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Oxidation of Fe–10Cr in O2 and in O2 + H2O environment at 600 °C: A microstructural investigation

Authors
Journal
Corrosion Science
0010-938X
Publisher
Elsevier
Volume
75
Identifiers
DOI: 10.1016/j.corsci.2013.06.016
Keywords
  • A. Stainless Steel
  • B. Tem
  • B. Stem
  • C. High Temperature Corrosion
  • C. Internal Oxidation

Abstract

Abstract Oxidation of Fe–10Cr in dry and wet O2 was studied at 600°C for up to 168h. Oxide microstructure was investigated by STEM/EDX, FIB/SEM and TEM. Oxidation in dry O2 gives a Cr-rich protective (Fe1−xCrx)2O3 scale. The same protective oxide initially forms in O2+H2O environment, but after an incubation period scale breakdown is triggered by CrO2(OH)2 evaporation that depletes the substrate in Cr and converts (Fe1−xCrx)2O3 to FeCr spinel oxide. Internal oxidation occurs after breakaway. Alternating external and internal oxidation result in the inward-growing scale showing a characteristic banded morphology.

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