Comparison of the influence of nitrate ions on the electrochemical behaviour of iron and carbon steels in sulphate solutions

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	Comparison of the influence of nitrate ions on the electrochemical behaviour of iron and carbon steels in sulphate solutions
	H. Y. Ma; S. H. Chen; C. Yang; J. L. Luo
	2002
发表期刊	Journal of the Serbian Chemical Society
ISSN	0352-5139
卷号	67 期号:6 页码:425-436
摘要	The effect of nitrate ions on the electrochemical behaviour of iron (ferrite) and two carbon steels (martensite and pearlite) in sulphate solutions of different pH values was investigated by cyclic voltammetry, polarization and electrochemical impedance spectroscopy The pitting inhibiting effect of nitrate ions on ferrite in sulphate media is pH dependent. Nitrate ions were unable to inhibit the pitting on ferrite in neutral sulphate solutions, but did effectively protect passivated ferrite from pitting in acidic sulphate solutions. No pitting occurred on the surface of the martensite and pearlite specimens in sulphate solutions, regardless of the pH of the solutions. At the open-circuit corrosion potentials, the three materials underwent general corrosion. The impedance spectra for die three materials measured in neutral sulphate solutions containing nitnates and chlorides at the corrosion potentials all showed a capacitive loop, while in acidic sulphate solutions their impedance spectra were greatly reduced in size and displayed at least a low frequency impedance loop (inductive or capacitive loop) besides the well-known high frequency capacitive loop. The variation of the impedance behaviour with pH is explained.
部门归属	shandong univ, dept chem, jinan 250100, peoples r china. state key lab corros & protect met, shenyang 110015, peoples r china. univ alberta, dept chem & mat engn, edmonton, ab t6g 2g6, canada.;chen, sh (reprint author), shandong univ, dept chem, jinan 250100, peoples r china
关键词	Pitting General Corrosion Passive Film Cyclic Voltammogram Polarization Curves
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WOS记录号	WOS:000176608800006
引用统计	被引频次：4[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/321006/36370
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	H. Y. Ma,S. H. Chen,C. Yang,et al. Comparison of the influence of nitrate ions on the electrochemical behaviour of iron and carbon steels in sulphate solutions[J]. Journal of the Serbian Chemical Society,2002,67(6):425-436.
APA	H. Y. Ma,S. H. Chen,C. Yang,&J. L. Luo.(2002).Comparison of the influence of nitrate ions on the electrochemical behaviour of iron and carbon steels in sulphate solutions.Journal of the Serbian Chemical Society,67(6),425-436.
MLA	H. Y. Ma,et al."Comparison of the influence of nitrate ions on the electrochemical behaviour of iron and carbon steels in sulphate solutions".Journal of the Serbian Chemical Society 67.6(2002):425-436.