Advanced neutron absorber Ni-Cr-Mo-Gd alloys seawater corrosion mechanism and susceptibility study

Tang, Wei; Jun, Jiheon; Kwon, Sun Yong; Martinez, Oscar; Su, Yi Feng; Repukaiti, Reyixiati

doi:10.1016/j.mtcomm.2024.108759

Title: Advanced neutron absorber Ni-Cr-Mo-Gd alloys seawater corrosion mechanism and susceptibility study

Journal Article · 26 March 2024 · Materials Today Communications

DOI: https://doi.org/10.1016/j.mtcomm.2024.108759 · OSTI ID:2333803

^[1];

^[1]; Su, Yi Feng ^[1]; Repukaiti, Reyixiati ^[2]

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Previous studies demonstrated the corrosion susceptibility of advanced neutron absorber (ANA) Ni-Cr-Mo-Gd in a seawater environment but remained inconclusive. In this paper, scanning electron microscopy was employed to identify the corrosion phase in Ni-Cr-Mo-Gd, and computational thermodynamic simulation was used to study phase corrosion potentials. Results showed that the Ni₅Gd second phase, distributed along FCC grain boundaries in Ni-Cr-Mo-Gd, has lower corrosion potential than the substrate. Furthermore, heat treatment and alloy chemistry adjustment would not ameliorate the ANA corrosion susceptibility. Finally, isolating the Ni₅Gd from the corrosion medium through advanced manufacturing is a viable way to improve the ANA corrosion resistance.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC05-00OR22725; AC07-05ID14517

OSTI ID:: 2333803

Alternate ID(s):: OSTI ID: 2331329

Journal Information:: Materials Today Communications, Journal Name: Materials Today Communications Vol. 39; ISSN 2352-4928

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
neutron absorber
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corrosion
thermodynamic simulation
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Title: Advanced neutron absorber Ni-Cr-Mo-Gd alloys seawater corrosion mechanism and susceptibility study

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