Long-term corrosion performance of T91 ferritic/martensitic steel at 400 °C in flowing Pb-Bi eutectic with 2 × 10~(-7) mass% dissolved oxygen

摘要

Long-term corrosion behavior of T91 ferritic/martensitic steel in oxygen-doped flowing Pb-Bi eutectic is investigated by exposure for up to 20,000 h at 400 degrees C, 2 m/s and 2 x 10(-7) mass% dissolved oxygen. The corrosion phenomena and kinetics of interaction are characterized qualitatively and quantitatively. The steel shows major oxidation resulted in the formation of a bilayer Fe3O4 / Fe(Fe,Cr)(2)O-4 scale. After 20,000 h, the scale thickness averages 12.6 (+/- 2.7) mu m. The metal recession due to oxidation does not exceed 5 (+/- 1) mu m. Besides oxidation, the localized dissolution of the steel is observed reaching of similar to 100 mu m in depth after 20,000 h.