Abstract
The corrosion process of 316 L austenitic stainless steel in liquid lead-bismuth eutectic at 500°C with dissolved oxygen concentrations ranging from below 10−11 to 10−5 wt% was investigated. The maximum dissolution corrosion damage and the highest oxygen consumption during the experiments occurred at intermediate dissolved oxygen concentrations (10−7 and 10−6 wt%). An assumption of a governing role of Fe3O4 equilibrium and diffusion-limited processes on the steel surface explains quantitatively this observation. The proposed mechanism suggests that oxygen-enhanced dissolution is a result of the combination of solid steel dissolution and the oxidation of dissolved steel constituents in the liquid metal bulk.
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