Corrosion Behavior of 904L Super-austenitic Stainless Steel in Simulated Primary Water in Nuclear Power Plants

doi:10.11902/1005.4537.2023.230

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (3): 716-724 DOI: 10.11902/1005.4537.2023.230

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Corrosion Behavior of 904L Super-austenitic Stainless Steel in Simulated Primary Water in Nuclear Power Plants

LI Chan¹, WANG Qingtian², YANG Chenggang¹, ZHANG Xianwei³, HAN Dongao¹, LIU Yuwei¹, LIU Zhiyong³(

)

1. Nuclear and Radiation Safety Center, Ministry of Ecology and Environment, Beijing 100082, China
2. Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu 610213, China
3. National Materials Corrosion and Protection Data Center, University of Science and Technology Beijing, Beijing 100083, China

Cite this article:

LI Chan, WANG Qingtian, YANG Chenggang, ZHANG Xianwei, HAN Dongao, LIU Yuwei, LIU Zhiyong. Corrosion Behavior of 904L Super-austenitic Stainless Steel in Simulated Primary Water in Nuclear Power Plants. Journal of Chinese Society for Corrosion and protection, 2024, 44(3): 716-724.

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Abstract

In this work, the electrochemical properties and stress corrosion cracking (SCC) behavior of 904L super-austenitic stainless steel with various kinds of microstructure in simulated primary water were studied through potentiodynamic polarization curve measurement, electrochemical impedance spectroscopy (EIS) and U-bend immersion tests. The results show that the corrosion process of 904L stainless steel in simulated primary water is completely controlled by electrochemical reaction. Temperature has a strong influence on the corrosion resistance of 904L stainless steel. With the increase of temperature, the polarization resistance decreases; the passive range narrows down; corrosion potential shifts negatively, and corrosion resistance declines sharply. U-bend immersion test results prove that 904L stainless steel with the three kinds of microstructure has certain SCC susceptibility in simulated primary water. The corrosion products exert a two-layered structure, where the inner layer is uniform and thin black corrosion product, and the outer layer is granular and coarse white corrosion products. Among the three kinds of microstructure, the sensitized 904L stainless steel presents the highest SCC susceptibility, while solid solution treatment can decrease SCC susceptibility.

Key words: super-austenitic stainless steel stress corrosion cracking electrochemical behavior primary water nuclear power plant

Received: 24 July 2023 32134.14.1005.4537.2023.230

ZTFLH:

TG174.2

Fund: National Natural Science Foundation of China(U22B2065);Opening Foundation of Science and Technology on Reactor System Design Technology Laboratory

Corresponding Authors: LIU Zhiyong, E-mail: liuzhiyong7804@126.com

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	LI Chan
	WANG Qingtian
	YANG Chenggang
	ZHANG Xianwei
	HAN Dongao
	LIU Yuwei
	LIU Zhiyong

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https://www.jcscp.org/EN/10.11902/1005.4537.2023.230 OR https://www.jcscp.org/EN/Y2024/V44/I3/716

Table 1 Mechanical properties of 904L stainless steel

Fig.1 Dimensions of the sample used in U-bend immersion test

Fig.2 Metallographic images (a-c) and EBSD results (d-f) of as-received (a, d), sensitized (b, e) and solid solution treated (c, f) 904L stainless steel

Fig.3 XRD patterns of 904L stainless steel in different treatment states

Fig.4 Slow-scan (a-c) and fast-scan (d-f) polarization curves of as-received (a, d), sensitized (b, e) and solid solution treated (c, f) 904L stainless steel in the test solution at different temperatures

Table 2 Fitting parameters of polarization curves of as-received, sensitized and solid solution treated 904L stainless steel in the test solution at different temperatures

Fig.5 EIS results of as-received (a), sensitized (b) and solid solution treated (c) 904L stainless steel in the test solution at different temperatures

Fig.6 Equivalent circuit for fitting the EIS results

Table 3 Fitting parameters of EIS results of as-received, sensitized and solid solution treated 904L stainless steel in the test solution at different temperatures

Fig.7 Macro morphologies of U-bend specimens of as-received (a), sensitized (b) and solid solution treated (c) 904L stainless steel after immersion in the test solution for 30 d (a1-c1) and 60 d (a2-c2)

Fig.8 Micro morphologies of U-bend specimens of as-received (a), sensitized (b) and solid solution treated (c) 904L stainless steel after immersion in the test solution for 30 d (a1-c1) and 60 d (a2-c2)

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