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Kim, Ji Hyun
UNIST Nuclear Innovative Materials Laboratory(UNIMAT)
Research Interests
  • High temperature water corrosion

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Microscopic characterization of pretransition oxide formed on Zr-Nb-Sn alloy under various Zn and dissolved hydrogen concentrations

DC FieldValueLanguage
dc.contributor.authorKim, Sungyuko
dc.contributor.authorKim, Taehoko
dc.contributor.authorKim, Ji Hyunko
dc.contributor.authorBahn, Chi Bumko
dc.date.available2018-05-09T06:27:47Z-
dc.date.created2018-05-09ko
dc.date.issued201804ko
dc.identifier.citationNUCLEAR ENGINEERING AND TECHNOLOGY, v.50, no.3, pp.416 - 424ko
dc.identifier.issn1738-5733ko
dc.identifier.urihttp://scholarworks.unist.ac.kr/handle/201301/24097-
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S1738573317301535?via%3Dihubko
dc.description.abstractMicrostructure of oxide formed on Zr-Nb-Sn tube sample was intensively examined by scanning transmission electron microscopy after exposure to simulated primary water chemistry conditions of various concentrations of Zn (0 or 30 ppb) and dissolved hydrogen (H-2) (30 or 50 cc/kg) for various durations without applying desirable heat flux. Microstructural analysis indicated that there was no noticeable change in the microstructure of the oxide corresponding to water chemistry changes within the test duration of 100 days (pretransition stage) and no significant difference in the overall thickness of the oxide layer. Equiaxed grains with nano-size pores along the grain boundaries and microcracks were dominant near the water/oxide interface, regardless of water chemistry conditions. As the metal/oxide interface was approached, the number of pores tended to decrease. However, there was no significant effect of H-2 concentration between 30 cc/kg and 50 cc/kg on the corrosion of the oxide after free immersion in water at 360 degrees C. The adsorption of Zn on the cladding surface was observed by X-ray photoelectron spectroscopy and detected as ZnO on the outer oxide surface. From the perspective of OH - ion diffusion and porosity formation, the absence of noticeable effects was discussed further.ko
dc.languageENGko
dc.publisherKOREAN NUCLEAR SOCko
dc.subjectDissolved Hydrogen Effectko
dc.subjectPorosityko
dc.subjectPretransition Oxideko
dc.subjectTransmission Electron Microscopy (TEM)ko
dc.subjectZirconium Alloysko
dc.titleMicroscopic characterization of pretransition oxide formed on Zr-Nb-Sn alloy under various Zn and dissolved hydrogen concentrationsko
dc.typeARTICLEko
dc.identifier.pid1043null
dc.identifier.rimsid30282ko
dc.identifier.scopusid2-s2.0-85041597399ko
dc.identifier.wosid000430151900010ko
dc.type.rimsAko
dc.identifier.doihttp://dx.doi.org/10.1016/j.net.2017.11.009ko
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