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The long-term performance of ferritic/martensitic steel T91 and austenitic 316L in oxygen-containing flowing lead-bismuth eutectic at 550°C was investigated by exposing the materials for up to 15,000 h in the CORRIDA loop. The velocity of the liquid-metal flow was 2 m/s and the concentration of dissolved oxygen averaged 1.6×10−6 mass %. The resulting corrosion processes and products were analyzed and quantified using metallographic methods.

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The long-term performance of ferritic/martensitic steel T91 and austenitic 316L in oxygen-containing flowing lead-bismuth eutectic at 550°C was investigated by exposing the materials for up to 15000 h in the CORRIDA loop. The velocity of the liquid-metal flow was 2 m/s and the concentration of dissolved oxygen averaged 1.6×10−6 mass%. The resulting corrosion processes and products were analyzed and quantified using metallographic methods.

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Binary Ni-Cr alloys (0 to 45 mass% Cr) were exposed to an aqueous solution resulting from the oxidation of dichloromethane (CH 2 Cl 2 ) in the presence of hydrogen peroxide (H 2 O 2 ) at 40 MPa and temperatures between ~100°C and 415°C. The composition of the reaction medium after complete oxidation of the chlorinated hydrocarbon was 0.12 m hydrochloric acid (HCl), 0.06 m oxygen (O 2 ), and 0.06 m carbon dioxide (CO 2 ). Of the alloys investigated, NiCr25 performed best in experiments for 120 h under these conditions. Aspects of the complex corrosion kinetics for binary Ni-Cr alloys are compared with the predictions of a mathematical model. Results from other investigations that cover temperatures up to 500°C at a comparable pressure are reviewed in light of the new fi ndings.