EIS investigation on surface roughness induced oxide film evolution on 304 SS in simulated secondary circuit water of PWR system

doi:10.1007/s10853-025-10664-5

IMR OpenIR

	EIS investigation on surface roughness induced oxide film evolution on 304 SS in simulated secondary circuit water of PWR system
	Ji, Yuefei 1,2; Hao, Long 1,2; Wang, Jianqiu 2,3; Ke, Wei 2
通讯作者	Hao, Long(lhao@imr.ac.cn)
	2025-02-03
发表期刊	JOURNAL OF MATERIALS SCIENCE
ISSN	0022-2461
页码	22
摘要	The surface roughness of nuclear-grade structural material shows a significant influence on its corrosion behavior under high-temperature and high-pressure (HTHP) water exposure condition in the pressurized water reactor (PWR) system. In this investigation, the surface roughness induced oxide film evolution on 304 stainless steel (SS) in simulated HTHP water has been investigated by in-situ cyclic electrochemical impedance spectroscopy (EIS) and ex-situ characterizations. The results indicate that cyclic-EIS data interpretation can well understand the surface roughness induced oxide film growth and its structures evolution on 304 SS electrodes under HTHP water condition. Besides, the 240#-sample with a much higher surface roughness has the thickest oxide film with the largest and increasing \|Z\|0.01 Hz value. In contrast, the polished-sample with a much lower surface roughness has the thinnest oxide film with the lowest but stabilized \|Z\|0.01 Hz value. A higher surface roughness facilitates the formation of a thicker oxide film but with the loose outer layer in higher thickness than the compact inner layer. Although a lower surface roughness leads to the formation of a thinner oxide film, the compact and thus corrosion resistant inner layer contributes to a relatively lower corrosion rate of 304 SS under HTHP water environment of PWR system. In addition, cyclic-EIS data interpretation indicates that the compact inner layer contributes mainly but the loose outer layer contributes less to the measured impedance on 304 SS electrodes.Graphical abstractThe surface condition of nuclear power structural materials exerts a significant influence on their corrosion behavior in high-temperature and high-pressure water. In this work, the effect of surface roughness on the corrosion behavior of 304 stainless steel (304 SS) in the simulated secondary water was investigated. The results indicate that surface roughness has minimal impact on the composition of oxide films, but it exerts a significant influence on their structural characteristics and consequently affects the corrosion behavior. Electrochemical impedance spectroscopy (EIS) measurement and transmission electron microscope (TEM) observation suggested that the 304 SS with a higher surface roughness can lead to an oxide film with heterogeneous inner oxide layer, where a porous and discontinuous Cr-rich inner oxide layer can be observed, implying its limited protective ability. Therefore, it is recommended to regulate the surface roughness of materials in PWR for effective corrosion control.
资助者	China National Nuclear Corporation ; LingChuang Research Project of China National Nuclear Corporation
DOI	10.1007/s10853-025-10664-5
收录类别	SCI
语种	英语
资助项目	China National Nuclear Corporation[E041F213] ; LingChuang Research Project of China National Nuclear Corporation
WOS研究方向	Materials Science
WOS类目	Materials Science, Multidisciplinary
WOS记录号	WOS:001411643100001
出版者	SPRINGER
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/180675
专题	中国科学院金属研究所
通讯作者	Hao, Long
作者单位	1.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 2.Chinese Acad Sci, CAS Key Lab Nucl Mat & Safety Assessment, Inst Met Res, Shenyang 110016, Peoples R China 3.Inst Corros Sci & Technol, Guangzhou 510530, Peoples R China
推荐引用方式 GB/T 7714	Ji, Yuefei,Hao, Long,Wang, Jianqiu,et al. EIS investigation on surface roughness induced oxide film evolution on 304 SS in simulated secondary circuit water of PWR system[J]. JOURNAL OF MATERIALS SCIENCE,2025:22.
APA	Ji, Yuefei,Hao, Long,Wang, Jianqiu,&Ke, Wei.(2025).EIS investigation on surface roughness induced oxide film evolution on 304 SS in simulated secondary circuit water of PWR system.JOURNAL OF MATERIALS SCIENCE,22.
MLA	Ji, Yuefei,et al."EIS investigation on surface roughness induced oxide film evolution on 304 SS in simulated secondary circuit water of PWR system".JOURNAL OF MATERIALS SCIENCE (2025):22.