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Electrochemical behavior of hydrogen precipitated Zircaloy-4

Title
Electrochemical behavior of hydrogen precipitated Zircaloy-4
Author
김용수
Keywords
Zircaloy-4; hydrogen precipitation; hydrides; corrosion potential; potentio-dynamic anodic polarization
Issue Date
2015-11
Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
Citation
MODERN PHYSICS LETTERS B, v. 29, NO 32, Page. 1-12, Article Number: 1550200
Abstract
This work investigates the hydrogen precipitation effects on the electrochemical behavior of Zircaloy-4 in acidic saline media. The specimens of Zircaloy-4 were hydrogen charged at 200, 400 and 600 porn concentrations for 30 min at 400 degrees C. X-ray diffraction (XRD) studies confirmed the formation of delta hydrides in the material. Scanning electron microscopy (SEM) results also indicated the presence of elongated hydrides whose density and thickness increased with the increase of hydrogen concentration in the alloy. The corrosion kinetics of the specimens were explored before and after hydrogen precipitation using potentiodynamic anodic polarization (PAP) and electrochemical impedance spectroscopy (EIS) techniques. The results showed that hydrogen precipitation shifts the corrosion potential towards more positive and thus improves the corrosion resistance of the alloy. The charge transfer resistance (R-ct) of the alloy was found to increase with increasing hydrogen concentration. This indicates an increased polarization tendency of the Zircaloy-4 surface with a limited dissolution tendency in the presence of delta hydrides.
URI
http://www.worldscientific.com/doi/abs/10.1142/S0217984915502000http://hdl.handle.net/20.500.11754/28800
ISSN
0217-9849; 1793-6640
DOI
10.1142/S0217984915502000
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > NUCLEAR ENGINEERING(원자력공학과) > Articles
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