Abstract
The most important corrosion product in sodium loops is NaCrO 2. In this study, the threshold oxygen level in sodium, for the formation of NaCrO 2 when in contact with austenitic (AISI 304 SS, 316 SS and D9 alloy) and ferritic (Fe-9Cr-1Mo and Fe- 2 1 4 Cr-1Mo) steels at temperatures between 573 and 1023 K were evaluated. By a weighted regression analysis of the reliable measurements reported in the literature, the Gibbs energy of formation of NaCrO 2, Δ f G° = −913762.8 + 237.24 T J/mol, was obtained. Using this relation, the threshold oxygen levels ( C O ) were evaluated and fitted by regression analysis into expressions of the form ln C O (ppm) = A + B T . Based on the nature of the carbides formed in AISI 304 SS and 316 SS, the effect of depletion of chromium on the carbon activity of these alloys was analysed by a thermodynamic model.
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