Long-term prediction of localized corrosion of alloy 825 in high-level nuclear waste repository environments
- Center for Nuclear Waste Regulatory Analyses, San Antonio, TX (United States)
Long-term prediction of localized corrosion of high-level nuclear waste container materials is a necessary step in the performance assessment of the engineered barrier system. Localized corrosion of corrosion-resistant materials may occur if the containers are exposed to chloride-containing ground water at elevated temperatures. Potentiostatic tests conducted on alloy 825 (UNS NO8825), a candidate container material, have shown that the potential at which localized corrosion can be initiated is a function of surface conditions and exposure time. The initiation potentials for localized corrosion measured in short-term tests with polished specimens overestimated the long-term initiation potentials by as much as 300 mV. On the other hand, the repassivation potential obtained from short-term tests on deep pits can be used to predict the initiation of localized corrosion in long-term tests.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 201373
- Journal Information:
- Corrosion, Journal Name: Corrosion Journal Issue: 2 Vol. 52; ISSN 0010-9312; ISSN CORRAK
- Country of Publication:
- United States
- Language:
- English
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