Corrosion interactions between stainless steel and lead vanado-iodoapatite nuclear waste form part I
Journal Article
·
· npj Materials Degradation
- The Ohio State Univ., Columbus, OH (United States). Dept. of Materials Science and Engineering; The Ohio State University
- Rensselaer Polytechnic Inst., Troy, NY (United States). Dept. of Mechanical Aerospace and Nuclear Engineering
- Rensselaer Polytechnic Inst., Troy, NY (United States). Dept. of Mechanical Aerospace and Nuclear Engineering; Idaho National Lab. (INL), Idaho Falls, ID (United States). Materials and Fuel Complex
- The Ohio State Univ., Columbus, OH (United States). Dept. of Materials Science and Engineering
This study explores the corrosion interactions between a metallic canister material, stainless steel (SS) 316, and an I-bearing ceramic waste form, lead vanado-iodoapatite (I-APT, Pb9.85(VO4)6I1.7), in a chloride solution. Crevice corrosion of the SS in close proximity to the I-APT resulted in the development of an aggressive environment at the interface of the two materials, which was acidic and enriched in Cl– anions. I-APT also corroded in the crevice region, primarily through ion-exchange between the I– ions from the I-APT matrix and anions from the environment. The enrichment of Cl– anions within the occluded crevice space as the result of SS crevice corrosion enhanced the corrosion of I-APT. The release of iodine from this apatite waste form could be accelerated owing to this mechanism. This is evidenced by a depletion of iodine from the I-APT matrix and a large amount of Cl-bearing precipitates on the surfaces of both SS and I-APT. On the other hand, the corrosion of I-APT leads to the precipitation of a V- and Pb-rich layer, which inhibits the localized corrosion of SS to an extent. This study advances the understanding of the near-field corrosion interactions between metallic canisters and ceramic waste forms.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Center for Performance and Design of Nuclear Waste Forms and Containers (WastePD); The Ohio State Univ., Columbus, OH (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0016584
- OSTI ID:
- 1666383
- Journal Information:
- npj Materials Degradation, Journal Name: npj Materials Degradation Journal Issue: 1 Vol. 4; ISSN 2397-2106
- Publisher:
- SpringerCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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