Corrosion behavior of Cr, Fe and Ni based superalloy in molten NaCl

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	Corrosion behavior of Cr, Fe and Ni based superalloy in molten NaCl
	Lu, Yang 1,2; Cheng, Bo 2; Wang, Junwei 2; Wang, Zhiping 1,2,3; Li, Wensheng 1,2
刊名	Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
	2014
卷号	43 期号:1 页码:17-23
关键词	Chromium alloys Corrosion resistance Corrosion resistant alloys Corrosive effects Grain boundaries Heat storage High temperature corrosion Iron alloys Metallic matrix composites Nickel alloys Sodium chloride Superalloys Thermal energy Chromium-based alloys Corrosion mechanisms Elements distribution High temperature phase Hot corrosion Molten salt NaCl Ni-based superalloys
ISSN号	1002185X
英文摘要	Molten NaCl is a strong corrosive substance for its container when NaCl acts as solar high-temperature phase change thermal storage medium. The corrosion kinetics curves were measured and drawn by means of a 192 h corrosion experiment of Fe, Cr, Ni-base alloys in 850°C molten NaCl. The cross section characteristics, the elements distribution features and the corrosion products of the samples were analyzed after corrosion by SEM, EPMA, EDS and XRD, and the corrosion mechanism was studied. The results show that the corrosion kinetics curves of three kinds of the alloys obey the linear law, the acceleration of mass loss rate for the three kinds of a alloys can be attributed to the reactions among chromium and NaCl, etc. Chromium based alloy shows the worst corrosion resistance among the three alloys, with the characteristic of corroding along grain boundaries (which provide channels for the infiltration of molten NaCl to alloy matrix), hence the corrosion process is accelerated. A thicker corrosion layers are formed on the surfaces of the nickel based and the iron based alloys, which provide a foundation for the adherence of Cr2O3. The adherence of Cr2O3 can lower the driving force of the Cr diffusion, which improves the corrosion resistance of the alloy. In addition, a spinel structure layer of corrosion product is formed on the surface of the iron based alloy, which improves the iron based alloy corrosion resistance ulteriorly, and makes it perform the best corrosion resistance among the three alloys. Copyright © 2014 Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	Science Press
WOS记录号	WOS:000331595900004
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/150427]
专题	省部共建有色金属先进加工与再利用国家重点实验室材料科学与工程学院
作者单位	1.State Key Laboratory of Gansu Advanced Nonferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050, China; 2.Lanzhou University of Technology, Lanzhou 730050, China; 3.Research Center of Gansu Nonferrous Metal Materials and Composite Materials Engineering, Lanzhou 730050, China
推荐引用方式 GB/T 7714	Lu, Yang,Cheng, Bo,Wang, Junwei,et al. Corrosion behavior of Cr, Fe and Ni based superalloy in molten NaCl[J]. Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering,2014,43(1):17-23.
APA	Lu, Yang,Cheng, Bo,Wang, Junwei,Wang, Zhiping,&Li, Wensheng.(2014).Corrosion behavior of Cr, Fe and Ni based superalloy in molten NaCl.Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering,43(1),17-23.
MLA	Lu, Yang,et al."Corrosion behavior of Cr, Fe and Ni based superalloy in molten NaCl".Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering 43.1(2014):17-23.