Unveiling the pitting corrosion mechanism of borated stainless steel in the wet storage environment of spent nuclear fuels

doi:10.1016/j.actamat.2023.119477

IMR OpenIR

	Unveiling the pitting corrosion mechanism of borated stainless steel in the wet storage environment of spent nuclear fuels
	Wang, Debin 1,2; Cui, Jingping 1; Ma, Aili 3; Ji, Baoting 1,2; Shi, Jian 4; Liu, Zhiwen 5; Yu, Bo 4; Chen, Xingqiu 1; Ma, Hui 1; Zhang, Suode 1; Wang, Jianqiang 1
通讯作者	Ma, Hui(hma@imr.ac.cn) ; Zhang, Suode(sdzhang@imr.ac.cn) ; Wang, Jianqiang(jqwang@imr.ac.cn)
	2024-01-15
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	263 页码:20
摘要	Borated stainless steels (BSSs) with high neutron absorbability are promising alloys for the wet storage of spent nuclear fuel. However, consensus on the underlying mechanisms for the effects of B content in BSS and H3BO3 in wet storage environment on the pitting corrosion resistance of BSSs is still lacking. To determine the mecha-nisms, we designed three hypoeutectic BSSs containing 0.6, 1.2 and 1.8 wt.% B and systematically investigated their electrochemical behavior in solutions with various Cl- /H3BO3 ratios through experimental and computa-tional studies. Results revealed that the pitting corrosion resistance of BSS was dependent on the synergistic effect of the pit initiation induced by localized Cr depletion and the pit stable growth caused by microgalvanic effect, causing the pitting corrosion preferentially occurred at the (Cr, Fe)2B/matrix interface. A higher B content increased the density and width while reduced the Cr contents of the Cr-depleted regions, enhancing the sus-ceptibility to pitting initiation. Meanwhile, the strengthened micro-galvanic effect between the (Cr, Fe)2B phase and gamma matrix further facilitated the stable pit growth. For the H3BO3 effect, the first-principles calculations indicated that the competitive adsorption of B(OH)4- to Cl- inhibited pitting initiation in solutions with lower Cl- /H3BO3 ratios. However, as the Cl-/H3BO3 increased, the inhibition effect of the H3BO3 was weakened, and the acidizing effect became the dominant factor deteriorating the corrosion property. Ultimately, based on the Cr depletion-microgalvanic synergetic mechanism, the corrosion resistance of the BSS was significantly improved by tailoring the size and distribution of the (Cr, Fe)2B phase.
关键词	Stainless steel Dual-phase Corrosion Passive film First-principles calculation
资助者	National Natural Science Foundation of China ; Key Research Program of the Chinese Academy of Sciences ; National Science and Technology Major Project ; Natural Science Foundation Project of Liaoning Province
DOI	10.1016/j.actamat.2023.119477
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[52171163] ; National Natural Science Foundation of China[U1908219] ; Key Research Program of the Chinese Academy of Sciences[ZDRW-CN-2021-2-2] ; National Science and Technology Major Project[J2019 -VI-0019-0134] ; Natural Science Foundation Project of Liaoning Province[2023 -MS -017]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001111772400001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：17[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/321006/183452
专题	中国科学院金属研究所
通讯作者	Ma, Hui; Zhang, Suode; Wang, Jianqiang
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, Shenyang 110016, Peoples R China 3.Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China 4.Shenyang Res Inst Foundry, Natl Key Lab Adv Casting Technol, Shenyang 110022, Peoples R China 5.Oxford Instruments Technol China, Floor 1, Bldg 17, 31 Xishiku St, Beijing 100034, Peoples R China
推荐引用方式 GB/T 7714	Wang, Debin,Cui, Jingping,Ma, Aili,et al. Unveiling the pitting corrosion mechanism of borated stainless steel in the wet storage environment of spent nuclear fuels[J]. ACTA MATERIALIA,2024,263:20.
APA	Wang, Debin.,Cui, Jingping.,Ma, Aili.,Ji, Baoting.,Shi, Jian.,...&Wang, Jianqiang.(2024).Unveiling the pitting corrosion mechanism of borated stainless steel in the wet storage environment of spent nuclear fuels.ACTA MATERIALIA,263,20.
MLA	Wang, Debin,et al."Unveiling the pitting corrosion mechanism of borated stainless steel in the wet storage environment of spent nuclear fuels".ACTA MATERIALIA 263(2024):20.