Cavitation erosion behaviour of 20SiMn low alloy steel in Na2SO4 and NaHCO3 solutions

doi:10.1016/j.corsci.2005.09.004

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	Cavitation erosion behaviour of 20SiMn low alloy steel in Na2SO4 and NaHCO3 solutions
	Jiang, Sheng Li; Zheng, Yu Gui; Yao, Zhi Ming
刊名	CORROSION SCIENCE
	2006-09-01
卷号	48 期号:9 页码:2614-2632
关键词	cavitation erosion 20SiMn low alloy steel corrosion microstructure electrochemical tests SO42- ion HCO3- ion synergistic effects
ISSN号	0010-938X
DOI	10.1016/j.corsci.2005.09.004
通讯作者	Zheng, Yu Gui(ygzheng@imr.ac.cn)
英文摘要	Most of the former studies on cavitation erosion (CE) in corrosive media were carried out in NaCl solutions. In contrast, the effects of SO42- and HCO3- ions, which are dominant anions in most rivers of China, on cavitation erosion have not been investigated systematically. In this paper, the cavitation erosion behaviour of 20SiMn low alloy steel in Na2SO4 and NaHCO3 solutions was investigated by using a magnetostrictive-induced CE facility. The micrographs of damaged surfaces were observed by scanning electron microscope (SEM). It was found that the CE rate of 20SiMn low alloy steel in 0.003% Na2SO4 solution was higher than that in 0.003% NaCl solution, but in 0.03%, 0.3%, and 3% solutions their CE rate was almost the same. The CE rate of 20SiMn low alloy steel in 0.0033% NaHCO3 solutions was higher than that in the equivalent 0.003-3% Na2SO4 and 0.003-3% NaCl solutions, which may be related to stress corrosion cracking or corrosion fatigue mechanism in NaHCO3 solutions. The role of corrosion was analyzed by using polarization curves, electrochemical impedance spectroscopy (EIS), linear polarization resistance and the corrosion potential with or without cavitation. Independent of the test media, cavitation shifted the corrosion potential in the positive direction and strongly enhanced the cathodic current density in the polarization curves. In the interaction of cavitation erosion and corrosion, the corrosion-induced erosion component was predominant. Cavitation also greatly reduced the magnitude of impedance though the initial impedance under cavitation conditions in 3% NaHCO3 solution was almost one order larger than that in 3% Na2SO4 solution. (c) 2005 Elsevier Ltd. All rights reserved.
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000240767300017
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/88853]
专题	金属研究所_中国科学院金属研究所
通讯作者	Zheng, Yu Gui
作者单位	Chinese Acad Sci, Inst Met Res, State Key Lab Corros & Protect, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Jiang, Sheng Li,Zheng, Yu Gui,Yao, Zhi Ming. Cavitation erosion behaviour of 20SiMn low alloy steel in Na2SO4 and NaHCO3 solutions[J]. CORROSION SCIENCE,2006,48(9):2614-2632.
APA	Jiang, Sheng Li,Zheng, Yu Gui,&Yao, Zhi Ming.(2006).Cavitation erosion behaviour of 20SiMn low alloy steel in Na2SO4 and NaHCO3 solutions.CORROSION SCIENCE,48(9),2614-2632.
MLA	Jiang, Sheng Li,et al."Cavitation erosion behaviour of 20SiMn low alloy steel in Na2SO4 and NaHCO3 solutions".CORROSION SCIENCE 48.9(2006):2614-2632.