Effects of water content on the corrosion behavior of NiCu low alloy steel emb e dde d in compacte d GMZ b entonite

doi:10.1016/j.jmst.2024.08.070

IMR OpenIR

	Effects of water content on the corrosion behavior of NiCu low alloy steel emb e dde d in compacte d GMZ b entonite
	Dhakal, Madhusudan 1,2; Wei, Xin 1,2; Oli, Hari Bhakta 1,2; Chen, Nan 1; Sun, Yupeng 1,2; Pokharel, Durga Bhakta 1,2; Ren, Qiying 1; Dong, Junhua 1,2; Ke, Wei 3
通讯作者	Wei, Xin(xwei@imr.ac.cn) ; Dong, Junhua(jhdong@imr.ac.cn)
	2025-07-01
发表期刊	JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN	1005-0302
卷号	222 页码:94-110
摘要	Buffer material and metal disposal containers are the key engineering barriers in the geological disposal of high-level radioactive waste. The durability of disposal containers largely depends on the water content in buffer material. This work focused on investigating the corrosion evolution of NiCu low alloy steel in compacted GMZ bentonite with different water contents for 270 d by using weight loss, electrochemical measurements, and various methods for analyzing corrosion products. As the water content increased from 13 % to 20 %, the water in the bentonite transformed from an unsaturated to a critical saturated state, and the corrosion rate of NiCu steel clearly increased. In these two systems, the oxygen could migrate to the thin liquid film on the steel surface through the air pores in the bentonite in the gas phase and undergo cathodic reduction. Meanwhile, it oxidized the ferrous hydrolysis products into ferric corrosion products and formed a rust layer, which could block the diffusion of oxygen. At that moment, the cathodic process of NiCu steel corrosion changed to rust reduction. When the water content continually increased to 30 % and 40 %, the compacted bentonite was in a saturation state, and the corrosion rate of NiCu steel was significantly decreased. This was because most pores among the bentonite particles were occupied by a large amount of free water, which hindered the diffusion of oxygen and inhibited its cathodic reduction. Furthermore, it restrained the oxidation of ferrous corrosion products, which greatly weakened the cathodic depolarization of rust, leading to the cathodic process being dominated by the hydrogen evolution reaction. (c) 2025 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
关键词	Low alloy steel Bentonite Water content Corrosion evolution Electrochemical measurement
资助者	National Natural Science Foundation of China ; National Key R&D Program of China ; China Scholarship Council
DOI	10.1016/j.jmst.2024.08.070
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[52173304] ; National Natural Science Foundation of China[U1867216] ; National Key R&D Program of China[2022YFB3207600] ; China Scholarship Council[2018SLJ014508]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001409298800001
出版者	ELSEVIER
引用统计	被引频次：2[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/321006/180488
专题	中国科学院金属研究所
通讯作者	Wei, Xin; Dong, Junhua
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China 3.Chinese Acad Sci, Inst Met Res, Environm Corros Ctr Mat, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Dhakal, Madhusudan,Wei, Xin,Oli, Hari Bhakta,et al. Effects of water content on the corrosion behavior of NiCu low alloy steel emb e dde d in compacte d GMZ b entonite[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2025,222:94-110.
APA	Dhakal, Madhusudan.,Wei, Xin.,Oli, Hari Bhakta.,Chen, Nan.,Sun, Yupeng.,...&Ke, Wei.(2025).Effects of water content on the corrosion behavior of NiCu low alloy steel emb e dde d in compacte d GMZ b entonite.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,222,94-110.
MLA	Dhakal, Madhusudan,et al."Effects of water content on the corrosion behavior of NiCu low alloy steel emb e dde d in compacte d GMZ b entonite".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 222(2025):94-110.