Corrosion Mechanism and Electrochemical Reactions on Alloy 690 in Simulated Primary Coolant of Water–Water Energy Reactors

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creativework.keywordsalloy 690, corrosion release, electrochemical impedance spectroscopy, mixed-conduction model, oxide growth, primary water chemistry
creativework.publisherMultidisciplinary Digital Publishing Institute (MDPI)en
dc.contributor.authorBojinov M.
dc.contributor.authorBetova I.
dc.contributor.authorKarastoyanov V.
dc.date.accessioned2024-07-10T14:27:06Z
dc.date.accessioned2024-07-10T14:51:12Z
dc.date.available2024-07-10T14:27:06Z
dc.date.available2024-07-10T14:51:12Z
dc.date.issued2024-04-01
dc.description.abstractDuring the power operation of the primary loop of a water cooled–water moderated energy reactor (WWER), the water chemistry evolves from a high-boron high-potassium composition to significantly lower concentrations of both constituents at the end of a campaign, and the Li concentration reaches ca. 0.7–0.9 ppm. In the present paper, the effect of primary water chemistry evolution during operation on the corrosion rate and conduction mechanism of oxides on Alloy 690 is studied by in situ impedance spectroscopy at 300 °C/9 MPa during 1-week exposures in an autoclave connected to a re-circulation loop. At the end of exposure, the samples were anodically polarized at potentials −0.8 to −0.1 V vs. SHE to evaluate the stability of the passive oxide. Simultaneously exposed samples of Alloy 690 were subsequently analyzed by XPS to estimate the thickness and in-depth composition of oxides. Impedance data were quantitatively interpreted using the mixed-conduction model (MCM) for oxide films. The effect of water chemistry evolution on the corrosion rate and conduction mechanism in the oxide on Alloy 690 in a primary coolant is discussed based on the obtained parameters.
dc.identifier.doi10.3390/ma17081846
dc.identifier.issn1996-1944
dc.identifier.scopusSCOPUS_ID:85191496991en
dc.identifier.urihttps://rlib.uctm.edu/handle/123456789/938
dc.language.isoen
dc.source.urihttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85191496991&origin=inward
dc.titleCorrosion Mechanism and Electrochemical Reactions on Alloy 690 in Simulated Primary Coolant of Water–Water Energy Reactors
dc.typeArticle
oaire.citation.issue8
oaire.citation.volume17
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