Abstract
Wear resistant alloys are required for deployment in pressurised water reactor primary circuits and in this context, the corrosion behaviour of a cast cobalt-based alloy following exposure for 30 days in lithiated water at 300 °C was investigated. Corrosion of the surface was observed, resulting in the formation of a ∼100 nm thick chromium- and silicon-rich oxide. Preferential corrosion of the matrix at its interface with just one of the carbide types was observed to a depth of ∼1 μm; for the first time this was shown to be not due to any inhomogeneity in the matrix but instead to be an electrochemical effect.
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