Interfacial degradation of ceramic and metallic materials under corrosion and irradiation conditions

Wang, Yachun
Thumbnail Image
Other Contributors
Lian, Jie
Borca-Tasçiuc, Theodorian
Liu, Li (Emily)
He, Xiaozheng (Sean)
Issue Date
Nuclear engineering
Terms of Use
This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.
Full Citation
The corrosion interactions between a metallic canister material, stainless steel 316, and IAPT ceramic in a chloride solution was explored. Crevice corrosion of the SS in close proximity to the IAPT resulted in the development of an aggressive environment at the interface of the two materials, which was acidic and enriched in Cl− anions. The enrichment of Cl− anions within the occluded crevice space as the result of SS crevice corrosion drastically enhanced the corrosion of IAPT. The release of radioactive iodine from this apatite waste form could be accelerated owing to this mechanism. This is evidenced by a substantial 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 IAPT leads to the precipitation of a V- and Pb-rich layer, which inhibits the localized corrosion of SS to an extent. This study reveals a new near-field corrosion mechanism for ceramic waste forms when they are exposed to aggressive local conditions created by the electrochemical reactions of nearby metals. This study advances the understanding of the near-field corrosion interactions between metallic canisters and ceramic waste forms and could be beneficial for a more accurate prediction of waste form degradation.
August 2020
School of Engineering
Dept. of Mechanical, Aerospace, and Nuclear Engineering
Rensselaer Polytechnic Institute, Troy, NY
Rensselaer Theses and Dissertations Online Collection
Restricted to current Rensselaer faculty, staff and students. Access inquiries may be directed to the Rensselaer Libraries.