Journal
CORROSION SCIENCE
Volume 207, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2022.110595
Keywords
Nuclear cladding; Alloys; Steam oxidation; Oxidation film
Funding
- National Key Research and Development Program of China [2019YFB1901003, 2016YFB0700100, 2016YFB0700104]
- Heilongjiang Science and Technology Plan Project [GX17A012]
- Fundamental Research Funds for the Central Universities [3072021CFJ1003]
- Fund of Science and Technology on Reactor Fuel and Materials Laboratory [6142A06070306]
- Key Laboratory of Superlight Materials and Surface Technology (Harbin Engineering University)
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This study investigated the effect of the Cr/Al ratio on the microstructure and steam oxidation behavior of Fe-Cr-Al alloys. It was found that the oxidation process can be divided into two steps, and the surface-oxidizing film was dominated by submicron grain-sized Al2O3, with its thickness increasing with the Cr or Al ratio. Alloys with a high Cr or Al ratio exhibited a rapid formation of a surface-oxidizing film, which acted as a passivation layer to reduce the water molecule diffusion rate.
This study investigated the effect of the Cr/Al ratio on the microstructure and steam oxidation behavior of Fe-Cr -Al alloys at temperatures between 1000 ? and 1300 ?. The results indicated a two-step oxidation process, including initial fast oxidation and film formation followed by long-term oxidation. The oxidizing film on the surface was dominated by submicron grain-sized Al2O3 and its thickness increased with the Cr or Al ratio. For the alloys with a high Cr or Al ratio, the rapid formation of a surface-oxidizing film acted as a passivation layer to reduce the water molecule diffusion rate, as confirmed by the corresponding exponential oxidation factor.
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