Polyaniline/poly(methylmethacrylate) blends for corrosion protection: The effect of passivating dopants on different metals

被引：57

作者：

da Silva, J. E. Pereira ^{[1
]}

de Torresi, S. I. Cordoba ^{[1
]}

Torresi, R. M. ^{[1
]}

机构：

[1] Univ Sao Paulo, Inst Quim, BR-05513970 Sao Paulo, Brazil

来源：

PROGRESS IN ORGANIC COATINGS | 2007年 / 58卷 / 01期

基金：

巴西圣保罗研究基金会;

关键词：

corrosion protection; polyaniline; acrylic blends; poly(methylmethacrylate);

D O I：

10.1016/j.porgcoat.2006.11.005

中图分类号：

O69 [应用化学];

学科分类号：

081704 [应用化学];

摘要：

This paper describes the mechanism concerning active corrosion protection of metals using different conducting blends, formed by doped polyaniline (PANI) and poly(methylmethacrylate) (PMMA). Electrochemical and spectroscopic techniques are used to investigate the influence of two different dopants of PANI on the anticorrosion performance for different metals: camphorsulfonic (HCSA) and phenylphosphonic acids (HPPA). Moreover, it was also carried out a structural characterization of conducting blends and the analysis of the passive films formed as a consequence of the redox reaction between PANI and the metal substrates. In all the metal/blend systems, a potential shift to more positive values than the potential of uncoated metals in acid solution is observed, indicating the protection of the metal substrate. Moreover, Raman microscopy technique showed a clear diminution of the oxidation number of the conducting polymer in the blends and also the presence of a second passive layer formed by counter ions released from PANI and different metal cations. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：33 / 39

页数：7

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