Cavitation erosion behaviour of 20SiMn low alloy steel in Na(2)SO(4) and NaHCO(3) solutions

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	Cavitation erosion behaviour of 20SiMn low alloy steel in Na(2)SO(4) and NaHCO(3) solutions
	S. L. Jiang; Y. G. Zheng; Z. M. Yao
	2006
发表期刊	Corrosion Science
ISSN	0010-938X
卷号	48 期号:9 页码:2614-2632
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 SO(4)(2-) and HCO(3)(-) 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 Na(2)SO(4) and NaHCO(3) 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% Na(2)SO(4) 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% NaHCO(3) solutions was higher than that in the equivalent 0.003-3% Na(2)SO(4) and 0.003-3% NaCl solutions, which may be related to stress corrosion cracking or corrosion fatigue mechanism in NaHCO(3) 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% NaHCO(3) solution was almost one order larger than that in 3% Na(2)SO(4) solution. (c) 2005 Elsevier Ltd. All rights reserved.
部门归属	chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china.;zheng, yg (reprint author), chinese acad sci, inst met res, state key lab corros & protect, s campus,62 wencui rd, shenyang 110016, peoples r china;ygzheng@imr.ac.cn
关键词	Cavitation Erosion 20simn Low Alloy Steel Corrosion Microstructure Electrochemical Tests So(4)(2-) Ion Hco(3)(-) Ion Synergistic Effects Stress-corrosion Cracking Duplex Stainless-steel Bicarbonate Solutions Chloride Iron Mechanism
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/34277
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	S. L. Jiang,Y. G. Zheng,Z. M. Yao. Cavitation erosion behaviour of 20SiMn low alloy steel in Na(2)SO(4) and NaHCO(3) solutions[J]. Corrosion Science,2006,48(9):2614-2632.
APA	S. L. Jiang,Y. G. Zheng,&Z. M. Yao.(2006).Cavitation erosion behaviour of 20SiMn low alloy steel in Na(2)SO(4) and NaHCO(3) solutions.Corrosion Science,48(9),2614-2632.
MLA	S. L. Jiang,et al."Cavitation erosion behaviour of 20SiMn low alloy steel in Na(2)SO(4) and NaHCO(3) solutions".Corrosion Science 48.9(2006):2614-2632.