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

doi:10.1088/1674-1056/23/8/088106

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.

Keywords: zircaloy defects hydrogen permeation electrochemical measurement

Received: 04 September 2013
Revised: 10 January 2014
Accepted manuscript online:

PACS:	81.07.-b	(Nanoscale materials and structures: fabrication and characterization)
	82.45.-h	(Electrochemistry and electrophoresis)
	82.45.Bb	(Corrosion and passivation)
	68.47.Gh	(Oxide surfaces)

Fund: 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).

Corresponding Authors: Ling Yun-Han
E-mail: yhling@mail.tsinghua.edu.cn

Cite this article:

Gu Jun-Ji (顾俊骥), Ling Yun-Han (凌云汉), Zhang Rui-Qian (张瑞谦), Dai Xun (戴训), Bai Xin-De (白新德) Properties of passive nano films on zircaloy-4 affected by defects induced by hydrogen permeation 2014 Chin. Phys. B 23 088106

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

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