Properties of passive nano films on zircaloy-4 affected by defects induced by hydrogen permeation

In this work, hydrogen absorption and the permeation behavior of the passive layer formed on zircaloy-4 are in- vestigated. Potentiodynamic polarization, Mott-Schottky analysis, electrochemical impedance spectroscopy, and Raman scattering spectroscopy are employed to characterize the passive defects...

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Bibliographic Details
Published in:Chinese physics B 2014-08, Vol.23 (8), p.154-159
Main Authors: Gu, Jun-Ji, Ling, Yun-Han, Zhang, Rui-Qian, Dai, Xun, Bai, Xin-De
Format: Article
Language:English
Subjects:
Defects
Electrochemical impedance spectroscopy
Hydrogen permeation
Light water reactors
Nanostructure
Permeation
Raman scattering
Zirconium dioxide
属性
拉曼散射光谱
氢气
渗透行为
纳米薄膜
缺陷
诱导
锆锡合金
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Summary:In this work, hydrogen absorption and the permeation behavior of the passive layer formed on zircaloy-4 are in- vestigated. Potentiodynamic polarization, Mott-Schottky analysis, electrochemical impedance spectroscopy, and Raman scattering spectroscopy are employed to characterize the passive defects before and after hydrogen permeation. It is found that the nanoscale passive ZrO2 films play an important role in the resistance against corrosion; hydrogen impingement, however, reduces the passive impedance towards hydrothermal oxidation. The increase of defects （vacancies） in passive film is probably attributed to the degradation. We believe that this finding will provide valuable insight into the understanding of the corrosion mechanism of zircaloys used in light water reactors.
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/23/8/088106