Corrosion Interaction of 9%Cr Ferritic/Martensitic Steels at 450 and 550?°C With Flowing Pb–Bi Eutectic Containing 10 ?7 Mass % Dissolved Oxygen

摘要

Corrosion behavior of 9%Cr F/M P92, E911, and EUROFER steels was investigated in flowing (2 m/s) Pb–Bi with 10~(?7) mass % O at 450 and 550?°C for up to 8766 and 2011?h, respectively. The steels show mixed corrosion modes simultaneously revealing protective scale formation, accelerated oxidation, and solution-based attack. At 450?°C, the accelerated oxidation resulted in a metal recession averaging 6 μm (± 2? μ m) after?～?8766?h, while local solution-based corrosion attack ranged from ～40 to 350? μ m. At 550?°C, the accelerated oxidation resulted in a metal recession of about 10? μ m (± 2? μ m) after?～?2011?h. Solution-based corrosion attack appears more regularly at 550?°C, with a maximum depth ranged from ～90 to 1000? μ m. The incubation time for the solution based attack at 450?°C is 500–2000?h and < 300?h at 550?°C.