Mechanism of corrosion of 9Cr and 12Cr ferritic/martensitic steels under oxygen-saturated sodium. (November 2016)

• Record Type: Journal Article
• Authors: Shin, Sang Hun; Lee, Jeonghyeon; Kim, Jun Hwan; Kim, Ji Hyun
• Is Part Of: Corrosion science. Volume 112(2016)
• Page Start: 611
• Page End: 624
• Publication Date: 2016-11
• Subjects: A. Steel -- A. Alloy -- B. SEM -- B. Weight loss -- C. High temperature corrosion; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2016.09.001
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Ferritic/martensitic steels (Gr.92 and HT9) were exposed to oxygen-saturated Na. Tests were carried out at 650 °C and 550 °C for 300 h. Na-Cr-O compound formed in the matrix of Gr. 92 and HT9 samples. Gr. 92 has a higher corrosion rate than HT9 in oxygen-saturated Na. In oxygen-saturation Na, corrosion is very rapid than the reported values. Abstract: Liquid sodium corrosion poses a major problem with liquid-sodium-cooled fast reactors. Ferritic/martensitic steels are used as cladding materials and structural materials in these reactors. Gr.92 and HT9 steels were exposed to oxygen-saturated sodium at 650 °C and 550 °C for 300 h, and a Na-Cr-O compound formed in the matrix of specimens. Gr.92 showed a higher corrosion rate than HT9. The corrosion rate of Ferritic/Martensitic Steels (FMS) in oxygen-saturated sodium was also modelled in this study. The empirical model was compared with the short-term experimental data. The results show that the empirical model had close value to the short-term experimental model.