Corrosion and Anodic Oxidation of Alloy 690 in Simulated Primary Coolant of a Small Modular Reactor Studied by In Situ Electrochemical Impedance Spectroscopy

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creativework.keywordsboron-free coolant, corrosion rate, in situ electrochemical measurements, nickel alloy, small modular reactor
creativework.publisherMultidisciplinary Digital Publishing Institute (MDPI)en
dc.contributor.authorBojinov M.
dc.contributor.authorBetova I.
dc.contributor.authorKarastoyanov V.
dc.date.accessioned2026-01-20T13:58:04Z
dc.date.accessioned2026-01-20T15:55:13Z
dc.date.available2026-01-20T13:58:04Z
dc.date.available2026-01-20T15:55:13Z
dc.date.issued2025-11-01
dc.description.abstractThe effect of KOH concentration as a boron-free coolant for prospective use in Small Modular Reactors (SMRs) on the corrosion of Alloy 690 is studied by in situ impedance spectroscopy at 280 °C/9 MPa during 168 h exposure in a flow-through cell connected to a high-temperature/high-pressure loop. To follow further oxidation of the passive film, the samples were subsequently polarized up to potentials 0.5 V more positive than the corrosion potential. The formed oxides were analyzed ex situ by measuring the atomic concentration of the constituent elements via glow discharge optical emission spectroscopy (GDOES) depth profiling. The Mixed-Conduction Model for Oxide Films (MCM) was employed to quantitatively interpret the impedance results. The estimated parameters are used to quantify the influence of KOH concentration and anodic polarization on oxide formation and soluble product release rates. Results are compared to those obtained in the nominal primary chemistry of pressurized water reactors and indicate that Alloy 690 can also be successfully used as a steam generator tube material in SMRs.
dc.identifier.doi10.3390/met15111242
dc.identifier.issn2075-4701
dc.identifier.scopusSCOPUS_ID:105022920767en
dc.identifier.urihttps://rlib.uctm.edu/handle/123456789/1933
dc.language.isoen
dc.source.urihttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=105022920767&origin=inward
dc.titleCorrosion and Anodic Oxidation of Alloy 690 in Simulated Primary Coolant of a Small Modular Reactor Studied by In Situ Electrochemical Impedance Spectroscopy
dc.typeArticle
oaire.citation.issue11
oaire.citation.volume15
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