Electrochemical impedance study of corrosion of pure Ni, Fe, Cr, and Fe-5Cr alloy in molten nitrides

doi:10.1002/maco.202314166

IMR OpenIR

	Electrochemical impedance study of corrosion of pure Ni, Fe, Cr, and Fe-5Cr alloy in molten nitrides
	Zhao, Guangyao 1; Han, Yu 1; Yang, Lingxu 2; Wang, Ying 2; Zeng, Chaoliu 2
通讯作者	Yang, Lingxu(yang_ling_xu@126.com)
	2024-01-11
发表期刊	MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
ISSN	0947-5117
页码	10
摘要	Molten nitrates or nitrate-nitrite mixtures have been used as heat transfer fluid as well as thermal energy storage medium in concentrated solar power plants and other industrial applications. However, containment materials in contact with these molten salts are subjected to molten salt corrosion, which has been a concern over the years. In this investigation, the corrosion behavior of pure Ni, Fe, Cr, and Fe-5Cr alloy (in weight percent) has been examined at 400 degrees C in molten nitrates using electrochemical impedance spectroscopy and gravimetric tests. It is shown that Ni, Fe, and Fe-5Cr exhibit mass gain, with the best corrosion resistance for Ni followed by Fe-5Cr and Fe, while pure Cr goes through fast dissolution, forming hexavalent chromium product K3Na(CrO4)2. The increase of salt basicity from Solar Salt to Hitec could accelerate the dissolution of Cr. Nevertheless, the formation of an inner Cr-containing scale could still offer the alloy good protection because the external insoluble Ni or Fe oxides can protect it from dissolution. In this investigation, the corrosion behavior of pure Ni, Fe, Cr, and Fe-5Cr alloy has been examined at 400 degrees C in molten nitrates using electrochemical impedance spectroscopy.image
关键词	corrosion electrochemical impedance spectroscopy Fe-Cr alloys molten nitrates pure metals
资助者	None
DOI	10.1002/maco.202314166
收录类别	SCI
语种	英语
资助项目	None
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001140192400001
出版者	WILEY-V C H VERLAG GMBH
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/321006/183397
专题	中国科学院金属研究所
通讯作者	Yang, Lingxu
作者单位	1.State Grid Smart Grid Res Inst Co Ltd, State Key Lab Adv Power Transmiss Technol, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Met Res, 62 Wencui Rd, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Guangyao,Han, Yu,Yang, Lingxu,et al. Electrochemical impedance study of corrosion of pure Ni, Fe, Cr, and Fe-5Cr alloy in molten nitrides[J]. MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION,2024:10.
APA	Zhao, Guangyao,Han, Yu,Yang, Lingxu,Wang, Ying,&Zeng, Chaoliu.(2024).Electrochemical impedance study of corrosion of pure Ni, Fe, Cr, and Fe-5Cr alloy in molten nitrides.MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION,10.
MLA	Zhao, Guangyao,et al."Electrochemical impedance study of corrosion of pure Ni, Fe, Cr, and Fe-5Cr alloy in molten nitrides".MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION (2024):10.