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Cyclic EIS investigation on corrosion evolution of 304 SS in simulated secondary circuit water of PWR system

Yuefei Ji, Long Hao, Jianqiu Wang, Wei Ke

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 17 December 2024

Issue publication date: 2 January 2025

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Abstract

Purpose

The purpose of this paper is to introduce cyclic electrochemical impedance spectroscopy (EIS) method to understand the corrosion evolution behavior of structural materials in secondary circuit water environments of pressurized water reactor (PWR) system.

Design/methodology/approach

The cyclic EIS has been used to understand the corrosion evolution of 304 stainless steel (SS) in simulated secondary circuit water environment. Scanning electron microscopy and X-ray photoelectron spectroscopy have been used to characterize the microstructure and corrosion morphology of 304 SS sample.

Findings

Cyclic EIS measurement is applicable in gaining information on the corrosion evolution of 304 SS in high-temperature and high-pressure (HTHP) water environments. Based on analyses of the cyclic EIS data, it is considered that the measured EIS response of 304 SS sample under HTHP water environment mainly comes from the compact inner part of the newly formed oxide layer, which gradually inhibits the progress of electrochemical reactions at the oxide layer/substrate interface.

Originality/value

The cyclic EIS has been introduced into HTHP water environment, and its reliability has been evaluated. It may find a wide application in corrosion studies of materials under HTHP water environments, which is critical for a safe operation in nuclear power plants and beneficial for the development of corrosion-resistant materials in PWR system.

Keywords

Acknowledgements

The authors gratefully acknowledge the financial support by LingChuang Research Project of China National Nuclear Corporation.

Citation

Ji, Y., Hao, L., Wang, J. and Ke, W. (2025), "Cyclic EIS investigation on corrosion evolution of 304 SS in simulated secondary circuit water of PWR system", Anti-Corrosion Methods and Materials, Vol. 72 No. 1, pp. 146-158. https://doi.org/10.1108/ACMM-10-2024-3106

Publisher

:

Emerald Publishing Limited

Copyright © 2024, Emerald Publishing Limited

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