Journal
CORROSION SCIENCE
Volume 203, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2022.110341
Keywords
Alloy; TEM; High temperature corrosion; Intergranular corrosion; Segregation
Funding
- Key Project of Nuclear Safety and Advanced Nuclear Technology [2019YFB1901002]
- National Nat-ural Science Foundation of China [U1867201, 52001192]
- China Postdoctoral Science Foundation [2021M692018]
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The corrosion behaviors of a Fe13Cr4Al2Mo1.2Nb alloy were studied in 360 degrees C water and 400 degrees C steam. Similar dual-layered oxide scales were formed under both conditions, but the inner oxide layer was thicker in 400 degrees C steam, indicating steam-accelerated corrosion.
The corrosion behaviors of a Fe13Cr4Al2Mo1.2Nb alloy in 360 degrees C aerated water and 400 degrees C superheated steam were investigated. A similar dual-layered oxide scale was formed under both conditions. However, the inner oxide layer was much thicker in 400 degrees C steam than in 360 degrees C water, indicating the occurrence of steamaccelerated corrosion. Nodular corrosion was observed following exposure to 360 degrees C water, while localized corrosion and Ni segregation along the grain boundary occurred after 120-d exposure to 400 degrees C steam. The Fe2Nb phase experienced delayed oxidation with respect to matrix, which involved transformation from amorphous Nb oxides to crystalline Nb2O5.
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