A study on the relationship between electronic structure and corrosion characteristics of zirconium alloy in high-temperature hydrogenated water. (15th August 2019)

• Record Type: Journal Article
• Authors: Kim, Taeho; Kim, Seunghyun; Lee, Yunju; Kim, Namdong; Bahn, Chi Bum; Couet, Adrien; Kim, Ji Hyun
• Is Part Of: Corrosion science. Volume 157(2019)
• Page Start: 180
• Page End: 188
• Publication Date: 2019-08-15
• Subjects: A. Alloy -- A. Zirconium -- B. AFS -- B. TEM -- C. Oxidation; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2019.05.035
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Electronic structure of zirconium oxide formed in hydrogenated water was investigated. STXM images show the sub-oxide region just above the zirconium oxide/metal interface. Intensity of eg and t2g peaks and the separation is changed due to position of oxide. The diffusivity of oxygen ion at suboxide layer can be influenced on corrosion rate. Abstract: The corrosion behavior of zirconium alloy was investigated using synchrotron scanning transmission X-ray microscopy and X-ray absorption spectroscopy. Scanning transmission X-ray micrographs showed different electronic structures at the oxide/metal interface of Zr–Nb–Sn alloy after exposure to high-temperature hydrogenated water. The orbital hybridization structure at the oxide/metal interface exhibited weaker t2g and eg peaks in X-ray absorption spectra, suggesting that zirconium suboxide can form just above the oxide/metal interface. The suboxide layer that formed at a high dissolved hydrogen concentration is thicker than the suboxide layer that formed at a normal dissolved hydrogen concentration after 100 d of oxidation.