Nitrate on localized corrosion of carbon steel and stainless steel in aqueous solutions

doi:10.1016/j.electacta.2020.137660

	Nitrate on localized corrosion of carbon steel and stainless steel in aqueous solutions
	Xu, Weichen 1,2,3; Zhang, Binbin1,2,3 ; Deng, Yu 2,4; Yang, Lihui1,2,3 ; Zhang, Jie1,2,3
	2021-02-10
发表期刊	ELECTROCHIMICA ACTA
ISSN	0013-4686
卷号	369 页码:13
通讯作者	Xu, Weichen(w.xu@qdio.ac.cn) ; Zhang, Jie(zhangjie@qdio.ac.cn)
摘要	Nitrate is significant for corrosion process, which has been extensively studied for decades, while some issues remain unclear. Adsorption and reduction mechanisms are widely proposed but separately in literature, and results are inconsistent regarding different corrosion modes and conditions. Adsorption mechanism of nitrate, mostly as competitive adsorption against chloride, is discussed regarding electrode potential, concentration, temperature and alloy composition. However, it has to be based on a premise that nitrate cannot stimulate corrosion, which cannot be fully interpreted by adsorption mechanism. This inadequacy is made up by nitrate reduction mechanism, consuming protons and producing water to lower aggressiveness. Based on these mechanisms, nitrate effect on localized corrosion of carbon steel and stainless steel in aqueous solutions are reviewed in details, including pitting, crevice corrosion and cracking. Nitrate tends to passivate salt-covered pit, but not salt-free pit since proton migration across salt layer is unavailable. However, we suggest that sufficient nitrate may passivate salt-free pit through reduction alone, while further work is required and suggested. Effect of nitrate on crevice corrosion is relatively consistent, which tends to inhibit dissolution against chloride. Nitrate reduction and adsorption are also important for cracking, mostly initiated from intergranular corrosion for carbon steels due to imperfect passivation, and from localized corrosion for stainless steels. Competition between localized corrosion and cracking can interpret inhibitive/non-inhibitive/promoting effect of nitrate. Corrosion products within a local site dissolving in nitrate are also discussed, which inhibit mass transport but enhance stability of dissolution. Nitrate is generally classified as inhibitor but described as dangerous inhibitor. (C) 2020 Elsevier Ltd. All rights reserved.
DOI	10.1016/j.electacta.2020.137660
收录类别	SCI
语种	英语
资助项目	Natural Science Foundation of Shandong Province, China[ZR2019QEM011] ; National Natural Science Foundation of China[51701101] ; National Natural Science Foundation of China[51501180] ; National Natural Science Foundation of China[41827805]
WOS研究方向	Electrochemistry
WOS类目	Electrochemistry
WOS记录号	WOS:000612048600009
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：18[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/169755
专题	海洋环境腐蚀与生物污损重点实验室
通讯作者	Xu, Weichen; Zhang, Jie
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Environm Corros & Biofouling, Qingdao 266071, Peoples R China 2.Pilot Natl Lab Marine Sci & Technol, Open Studio Marine Corros & Protect, Qingdao 266237, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China 4.Chongqing Jiaotong Univ, Sch Shipping & Naval Architecture, Chongqing 400074, Peoples R China
第一作者单位	中国科学院海洋研究所
通讯作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Xu, Weichen,Zhang, Binbin,Deng, Yu,et al. Nitrate on localized corrosion of carbon steel and stainless steel in aqueous solutions[J]. ELECTROCHIMICA ACTA,2021,369:13.
APA	Xu, Weichen,Zhang, Binbin,Deng, Yu,Yang, Lihui,&Zhang, Jie.(2021).Nitrate on localized corrosion of carbon steel and stainless steel in aqueous solutions.ELECTROCHIMICA ACTA,369,13.
MLA	Xu, Weichen,et al."Nitrate on localized corrosion of carbon steel and stainless steel in aqueous solutions".ELECTROCHIMICA ACTA 369(2021):13.

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