Degradation mechanism of lead-vanado-iodoapatite in NaCl solution

Wang, Yachun; Yao, Tiankai; Xi, Fayuan; Lei, Penghui; Guo, Xiaolei; He, Lingfeng; Frankel, Gerald S.; Lian, Jie

doi:10.1016/j.corsci.2020.108720

Degradation mechanism of lead-vanado-iodoapatite in NaCl solution

Journal Article · Tue May 12 00:00:00 EDT 2020 · Corrosion Science

DOI:https://doi.org/10.1016/j.corsci.2020.108720· OSTI ID:1865541

Wang, Yachun ^[1]; Yao, Tiankai ^[2]; Xi, Fayuan ^[3]; Lei, Penghui ^[3]; Guo, Xiaolei ^[4]; He, Lingfeng ^[5]; Frankel, Gerald S. ^[4]; Lian, Jie ^[3]

Rensselaer Polytechnic Inst., Troy, NY (United States); Idaho National Lab. (INL), Idaho Falls, ID (United States); Rensselaer Polytechnic Institue
Rensselaer Polytechnic Inst., Troy, NY (United States); Idaho National Lab. (INL), Idaho Falls, ID (United States)
Rensselaer Polytechnic Inst., Troy, NY (United States)
The Ohio State Univ., Columbus, OH (United States)
Idaho National Lab. (INL), Idaho Falls, ID (United States)

Degradation mechanism of lead-vanado-iodoapatite (IAPT) in NaCl solution at 90 °C was investigated through systematic characterization of surface morphology, microstructure and microchemistry evolution of the alteration layer. Nano-scale characterization indicated that IAPT crystals degraded from grain boundaries toward inner grains, forming ultrafine Cl-bearing crystallites. A coupled interface dissolution-reprecipitation replacement mechanism and the ion exchange between Cl^- and I^- across the degradation zone may together play roles in determining the nano-scale degradation behavior of IAPT. This work highlights the degradation through multiple reactions and elemental transport across the liquid-solid and solid-solid interfaces at length scales from sub-millimeter to nanoscale.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Performance and Design of Nuclear Waste Forms and Containers (WastePD); Rensselaer Polytechnic Inst., Troy, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0016584

OSTI ID:: 1865541

Journal Information:: Corrosion Science, Journal Name: Corrosion Science Vol. 172; ISSN 0010-938X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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