Effects of Cl- and SO42- ions on corrosion behavior of X70 steel

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	Effects of Cl- and SO42- ions on corrosion behavior of X70 steel
	J. W. Wu; X. G. Li; C. W. Du; S. Wang; Y. Q. Song
	2005
发表期刊	Journal of Materials Science & Technology
ISSN	1005-0302
卷号	21 期号:1 页码:28-32
摘要	Corrosion behaviors of X70 steel were studied by means of electrochemical experiments and morphology observation. First, through potentiodynamic polarization in solution of various Cl- ions concentration, it was found that E-pit began to appear in solution of Cl- concentration above 0.1 mol/L, and there was a critical point of Cl- concentration between 0.05 mol/L and 0.1 mol/L, below which the extent of pitting and general corrosion were trivial, while in solution of Cl- concentration above 0.1 mol/L, general and pitting corrosion became greater as the increasing of Cl- concentration. All of them were confirmed by the SEM observations after anodic polarization. Second, via the potentiodynamic polarization curves of X70 steel in 0.5 mol/L Cl- solution with 0, 0.05, 0.5 and 1 mol/L SO42- ions, it was found SO42- ions were able to inhibit corrosion aroused from Cl- ions, accordingly a model was set up to describe the process. In addition, to further explore the inhibited effect of SO42- ions, EIS was used in solutions of different Cl- and SO42- concentrations, the results revealed that the electrochemical resistance has a relation with the [SO42-]/[Cl-], that was, the bigger the value of [SO42-]/[Cl-], the greater the electrochemical resistance.
部门归属	univ sci & technol beijing, key lab corros eros & surface engn, ctr corros & protect, beijing 100083, peoples r china. chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china.;li, xg (reprint author), univ sci & technol beijing, key lab corros eros & surface engn, ctr corros & protect, beijing 100083, peoples r china;lixiaogang99@263.net
关键词	X70 Steel Chloride Ions Sulphate Ions Pitting General Corrosion Pitting Corrosion Pipeline Steel Electrochemical Impedance Nacl Solution Pits
URL	查看原文
WOS记录号	WOS:000226775000008
引用统计	被引频次：7[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/321006/35112
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. W. Wu,X. G. Li,C. W. Du,et al. Effects of Cl- and SO42- ions on corrosion behavior of X70 steel[J]. Journal of Materials Science & Technology,2005,21(1):28-32.
APA	J. W. Wu,X. G. Li,C. W. Du,S. Wang,&Y. Q. Song.(2005).Effects of Cl- and SO42- ions on corrosion behavior of X70 steel.Journal of Materials Science & Technology,21(1),28-32.
MLA	J. W. Wu,et al."Effects of Cl- and SO42- ions on corrosion behavior of X70 steel".Journal of Materials Science & Technology 21.1(2005):28-32.