The uniform corrosion rate under passive conditions and the localized corrosion susceptibility of Alloy 22, a candidate container material for the disposal of high-level nuclear waste in the potential repository at Yucca Mountain, Nevada, is studied in chloride containing solutions under fully immersed conditions. Results of tests conducted using the as-received material in the mill-annealed condition were compared to results obtained with thermally aged, as-welded, and welded and solution annealed specimens in order to evaluate the effects of fabrication processes on the corrosion resistance of Alloy 22. Uniform corrosion rates are similar for all microstructures. Thermal aging and welding reduces the crevice corrosion resistance of Alloy 22 with respect to the mill-annealed material. In addition, post weld solution annealing, which is proposed as a stress mitigation method for the disposal container, also reduced the localized corrosion resistance.

Subject
Materials, Corrosion resistant alloys, Corrosion rate, Repassivation potentials, Solution annealing, Chloride solutions, Crevice corrosion, Heat, Corrosion resistance, Localized corrosion, Alloys, Chlorides, Heat affected zone
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2004
Association for Materials Protection and Performance (AMPP)
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