Journal
CORROSION SCIENCE
Volume 46, Issue 9, Pages 2191-2201Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2004.01.018
Keywords
stainless steel; nitridation; in situ X-ray diffraction; oxidation; high temperature corrosion
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This paper presents a study on the oxide growth on a AISI 304 chromia-forming alloy, in air at 800 degreesC. After the nitridation treatment was performed on the steel surface, a gamma(N) solid solution is detected. In this case, no nitride formation in the alloy surface could be observed. In situ X-ray diffraction has been used to follow the oxides evolution at testing temperature. At the beginning of the oxidation test, CrN is formed together with Fe2O3. Nevertheless, Cr2O3 quickly appears and leads to a protective oxide scale formation growing according to a parabolic rate law. During oxidation in situ X-ray diffraction also shows that Fe2O3 is transformed into FeCr2O4, Our results show that nitridation increases the high temperature oxidation resistance of 304 steels at 800 degreesC. (C) 2004 Elsevier Ltd. All rights reserved.
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