中国物理B ›› 2014, Vol. 23 ›› Issue (8): 88106-088106.doi: 10.1088/1674-1056/23/8/088106

• SPECIAL TOPI—International Conference on Nanoscience & Technology, China 2013 • 上一篇    下一篇

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

顾俊骥a, 凌云汉a, 张瑞谦b, 戴训b, 白新德a   

  1. a School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;
    b Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610041, China
  • 收稿日期:2013-09-04 修回日期:2014-01-10 出版日期:2014-08-15 发布日期:2014-08-15
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No. 2011CB610501), the Funds from the State Key Laboratory of Surface and Chemistry, China (Grant No. SPC 201102), and the Reactor Fuel and Materials Laboratory, China (Grant No. STRFML-2013-05).

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

Gu Jun-Ji (顾俊骥)a, Ling Yun-Han (凌云汉)a, Zhang Rui-Qian (张瑞谦)b, Dai Xun (戴训)b, Bai Xin-De (白新德)a   

  1. a School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China;
    b Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu 610041, China
  • Received:2013-09-04 Revised:2014-01-10 Online:2014-08-15 Published:2014-08-15
  • Contact: Ling Yun-Han E-mail:yhling@mail.tsinghua.edu.cn
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No. 2011CB610501), the Funds from the State Key Laboratory of Surface and Chemistry, China (Grant No. SPC 201102), and the Reactor Fuel and Materials Laboratory, China (Grant No. STRFML-2013-05).

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摘要： In this work, hydrogen absorption and the permeation behavior of the passive layer formed on zircaloy-4 are investigated. 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.

关键词: zircaloy, defects, hydrogen permeation, electrochemical measurement

Abstract: In this work, hydrogen absorption and the permeation behavior of the passive layer formed on zircaloy-4 are investigated. 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.

Key words: zircaloy, defects, hydrogen permeation, electrochemical measurement

中图分类号:  (Nanoscale materials and structures: fabrication and characterization)

  • 81.07.-b
82.45.-h (Electrochemistry and electrophoresis) 82.45.Bb (Corrosion and passivation) 68.47.Gh (Oxide surfaces)