Journal
CORROSION SCIENCE
Volume 157, Issue -, Pages 274-283Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2019.05.029
Keywords
alpha-Al2O3 oxide film; Amorphous oxide; Mo segregation; Logarithmic time dependence
Funding
- U.S. Department of Energy, Office of Nuclear Energy Fuel Cycle Research and Development Program
- National Nuclear Security Administration of the U.S. Department of Energy [DE-AC52-06NA25396]
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Iron-chromium-aluminium alloys are of interest to the nuclear materials community due to their resistance to high temperature steam oxidation and good mechanical properties under irradiation. The present work investigates oxide formation on Fe-12Cr-6Al-2Mo-0.2Si-0.03Y alloy alloy at temperatures relevant to light water reactor cladding operation following extended aging to assess growth kinetics, chemical composition, and oxide microstructure. Oxide growth follows a logarithmic time dependence. When the oxidization temperature is 400 degrees C or below, the oxide is amorphous. At 500 degrees C or above, crystalline alpha-Al2O3 oxide film develops and the correlated logarithmic rate constant decreases significantly, indicating enhanced oxidation resistance of the formed oxide film.
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