Effect of chromium on corrosion resistance of Ni-Cr-Mo-Gd alloys in seawater

Repukaiti, Reyixiati; Hutcheson, Henry C.; Abreu, Abenchara M. Betancor; Diaz Aldana, Luis A.; Mizia, Ronald E.; Jarrell, Joshua; Tang, Wei; Lister, Tedd E.

doi:10.1016/j.jnucmat.2023.154581

Effect of chromium on corrosion resistance of Ni-Cr-Mo-Gd alloys in seawater

Journal Article · Fri Jun 16 00:00:00 UTC 2023 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2023.154581· OSTI ID:1988111

Repukaiti, Reyixiati ^[1]; Hutcheson, Henry C. ^[1]; Abreu, Abenchara M. Betancor ^[1]; ^[1]; Mizia, Ronald E. ^[1]; ^[1]; ^[2]; ^[1]

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

Neutron absorbing materials are being considered within commercial spent nuclear fuel disposal canisters to maintain nuclear subcriticality in storage. To select candidate alloys for the canisters, both neutron absorption and corrosion resistance should be considered. This work examines corrosion resistance of Ni-Cr-Mo-Gd alloys developed specifically for neutron absorption. The addition of Gd results in a secondary gadolinide phase (Ni₅Gd) that significantly changes the corrosion properties. Testing was performed primarily in seawater at 30°C. Seawater was selected as the most prevalent terrestrial brine and is characterized by a high chloride concentration. Various electrochemical corrosion techniques were carried out to evaluate Ni-Cr-Mo-Gd alloys with different Cr compositions and investigate the role of Ni₅Gd phase on corrosion behavior. C22 was included as a benchmark material, due to the similarity in composition and the significant corrosion data available. Here, test results showed a tendency to passivate over time which is attributed to dissolution of surface exposed Ni₅Gd phase. Cross-sectional analysis indicated that dissolution could penetrate hundreds of micrometers deep under aggressive conditions. It was found that higher Cr variant (21.01%) showed much shallower impact, suggesting Cr prevented primary phase corrosion and thus reduced Ni₅Gd phase dissolution. Acid pickling of the specimens showed much less dissolution for a higher Cr material and suggested some primary phase dissolution for the low Cr specimen. Acid pickled specimens showed positive shifts in the repassivation potential, suggesting increased surface passivation.

View Accepted Manuscript (DOE)

Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

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

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

OSTI ID:: 1988111

Alternate ID(s):: OSTI ID: 1994664

Report Number(s):: INL/JOU-23-71796-Revision-0

Journal Information:: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Vol. 584; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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