The corrosion mechanisms of alloy N10276 tubing exposed to hydrothermal and supercritical HCl-containing solutions is investigated through post-failure analysis of laboratory-scale preheaters and controlled-exposure experiments. Corrosion modes observed include dealloying of nickel and iron, intergranular corrosion, and stress corrosion cracking (SCC). Exposure temperatures are ascertained through detailed heat-transfer models and direct measurements. A correlation between the dealloying rate and the temperature and dielectric constant of the water is developed.

Subject
Materials, Sand, Reactors, Tubes, Walls, Tubing, Mechanical failure, Fluids, Heat, Mixing, Alloys, Dealloying, Stress corrosion cracking
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2001
Association for Materials Protection and Performance (AMPP)
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