Accelerating effect and mechanism of passivation of polyaniline on ferrous metals

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	Accelerating effect and mechanism of passivation of polyaniline on ferrous metals
	H. Zhu; L. Zhong; S. H. Xiao; F. X. Gan
	2004
发表期刊	Electrochimica Acta
ISSN	0013-4686
卷号	49 期号:28 页码:5161-5166
摘要	To investigate the corrosion protection mechanism of polyaniline (PANI) films on ferrous metals, this work presents preparation method of a separate protonated PANI film electrode and results of its open-circuit potential (OCP) in 0.5 M NaClO4 and 0.5 M Na2SO4 solutions with different pH and the galvanic interaction between the PANI film electrode and ferrous metals. X-ray photoelectron spectroscopy (XPS) shows the lower pH corresponds to higher protonation level of H+ in the film, and a more positive OCP of PANI film. The PANI film accelerated the corrosion of 20A carbon steel slightly with a PANI to steel area ratio less than 25: 1, while the PANI films maintained passivity for a ratio above to 25:1 for the 20A steel. For the coupling of 2Cr13 stainless steel/PANI, an equal area PANI film could maintain 2Cr13 in a passive state. The results suggest that corrosion protection of 20A carbon steel and 2Cr13 stainless steel by PANI film in the acid solution is due to passivity protection. The excess oxidative charge stored in the PANI and the equilibrium activity of protonated PANI with the acid environment provide a persistent driving force for carbon steel and 2Cr13 stainless steel passivity. (C) 2004 Elsevier Ltd. All rights reserved.
部门归属	wuhan univ, coll resource & environm sci, wuhan 430072, peoples r china. state key lab corros & protect met, shenyang 110015, peoples r china.;gan, fx (reprint author), wuhan univ, coll resource & environm sci, wuhan 430072, peoples r china;fxgan@public.wh.hb.cn
关键词	Protonated Polyaniline Ferrous Metals Open-circuit Potential Galvanic Coupling Passivity Corrosion Protection Mild-steel Coatings Behavior
URL	查看原文
WOS记录号	WOS:000224945700013
引用统计	被引频次：27[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/321006/35777
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	H. Zhu,L. Zhong,S. H. Xiao,et al. Accelerating effect and mechanism of passivation of polyaniline on ferrous metals[J]. Electrochimica Acta,2004,49(28):5161-5166.
APA	H. Zhu,L. Zhong,S. H. Xiao,&F. X. Gan.(2004).Accelerating effect and mechanism of passivation of polyaniline on ferrous metals.Electrochimica Acta,49(28),5161-5166.
MLA	H. Zhu,et al."Accelerating effect and mechanism of passivation of polyaniline on ferrous metals".Electrochimica Acta 49.28(2004):5161-5166.