Polyaniline acrylic coatings for corrosion inhibition: the role played by counter-ions

被引：132

作者：

da Silva, JEP ^{[1
]}

de Torresi, SIC ^{[1
]}

Torresi, RM ^{[1
]}

机构：

[1] Univ Sao Paulo, Inst Quim, CP 26077, BR-05513970 Sao Paulo, Brazil

来源：

CORROSION SCIENCE | 2005年 / 47卷 / 03期

关键词：

active corrosion protection; polyaniline; acrylic blends; iron;

D O I：

10.1016/j.corsci.2004.07.014

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The interest in providing new corrosion protection systems for different metals and metal alloys is related to restrictions to the use of chromium (VI) compounds owing to their environmental problems. This work presents the electrochemical behavior of a polymeric blend formed by camphorsulphonate or phenylphosphonate-doped polyaniline (PANI) and poly(methyl methacrylate) used for iron corrosion protection in sulphuric acid solutions with or without chloride ions. Results indicate that these blends act by a two-step protection mechanism. First, a redox reaction between Fe and PANI takes place leading to PANI reduction and concomitant anion release. Then, iron cations form a passivating complex with the PANI doping anion (camphorsulphonate or phenylphosphonate) that simultaneously acts as a second physical barrier to avoid penetration of aggressive ions. So, considering these processes, it is possible to conclude that PANI is an anion reservoir, which can release anions in a smart way when damage is produced on the surface of the coating. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：811 / 822

页数：12

共 36 条

[1] Inhibition of corrosion of steels with the exploitation of conducting polymers [J].

Ahmad, N ;

MacDiarmid, AG .

SYNTHETIC METALS, 1996, 78 (02) :103-110

[2] Polyaniline layer for iron protection in sulfate medium [J].

Bernard, MC ;

Hugot-Le Goff, A ;

Joiret, S ;

Dinh, NN ;

Toan, NN .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1999, 146 (03) :995-998

[3] Use of polyaniline and its derivatives in corrosion protection of copper and silver [J].

Brusic, V ;

Angelopoulos, M ;

Graham, T .

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1997, 144 (02) :436-442

[4] Electrodeposition of protective polyaniline films on mild steel [J].

Camalet, JL ;

Lacroix, JC ;

Aeiyach, S ;

ChaneChing, K ;

Lacaze, PC .

JOURNAL OF ELECTROANALYTICAL CHEMISTRY, 1996, 416 (1-2) :179-182

[5] Electrosynthesis of adherent polyaniline films on iron and mild steel in aqueous oxalic acid medium [J].

Camalet, JL ;

Lacroix, JC ;

Aeiyach, S ;

Chane-Ching, K ;

Lacaze, PC .

SYNTHETIC METALS, 1998, 93 (02) :133-142

[6] MAGNETIC-SUSCEPTIBILITY OF POLYANILINE IN SOLUTION IN NONPOLAR ORGANIC-SOLVENTS AND IN POLYBLENDS IN POLY(METHYL METHACRYLATE) [J].

CAO, Y ;

HEEGER, AJ .

SYNTHETIC METALS, 1992, 52 (02) :193-200

[7] COUNTERION INDUCED PROCESSIBILITY OF CONDUCTING POLYANILINE AND OF CONDUCTING POLYBLENDS OF POLYANILINE IN BULK POLYMERS [J].

CAO, Y ;

SMITH, P ;

HEEGER, AJ .

SYNTHETIC METALS, 1992, 48 (01) :91-97

[8]

da Silva JEP, 1999, ELECTROCHIM ACTA, V44, P1887

[9]

da Silva JEP, 2000, MACROMOLECULES, V33, P3077

[10] Polyaniline based acrylic blends for iron corrosion protection [J].

de Souza, S ;

da Silva, JEP ;

de Torresi, SIC ;

Temperini, MLA ;

Torresi, RM .

ELECTROCHEMICAL AND SOLID STATE LETTERS, 2001, 4 (08) :B27-B30

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