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Further insights into the mechanisms involved in the corrosion of 316L(N) austenitic steel in oxygenated liquid sodium at 550 °C

Abstract : 316L(N) austenitic steel was corroded at 550 °C in liquid sodium containing ca. 200 $\mu$g g$^{-1}$ 23 dissolved 24 oxygen from 242 h to 7704 h. NaCrO$_2$ is formed for all immersion times, O and Na from liquid metal 25 and Cr from steel. The oxidation front is located at the chromite / steel interface and in the steel grain 26 boundaries. M$_6$C carbides (M = Mo and Fe) are also formed, C from liquid sodium. NaCrO$_2$ is dissolved 27 until the saturation of liquid sodium in Cr is reached. The Cr solubility is higher than that of pure Cr due 28 to the presence of dissolved oxygen.
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Submitted on : Tuesday, June 16, 2020 - 3:30:39 PM
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Matthieu Rivollier, J.-L. Courouau, Michel Tabarant, Cécile Blanc, François Jomard, et al.. Further insights into the mechanisms involved in the corrosion of 316L(N) austenitic steel in oxygenated liquid sodium at 550 °C. Corrosion Science, Elsevier, 2020, 165, pp.108399. ⟨10.1016/j.corsci.2019.108399⟩. ⟨cea-02870210⟩

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