Synthesis and electrochemical evaluation of polypyrrole coatings electrodeposited onto AA-2024 alloy

被引：38

作者：

Arenas, M. A. ^{[2
]}

Bajos, L. Gonzalez ^{[1
]}

de Damborenea, J. J. ^{[2
]}

Ocon, P. ^{[1
]}

机构：

[1] Univ Autonoma Madrid, Dept Quim Fis Aplicada, Fac Ciencias, E-28049 Madrid, Spain

[2] CSIC, Dept Corros & Protecc, CENIM, E-28040 Madrid, Spain

来源：

PROGRESS IN ORGANIC COATINGS | 2008年 / 62卷 / 01期

关键词：

electrochemical deposition; conductive polymers; EIS; anodic films;

D O I：

10.1016/j.porgcoat.2007.09.019

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Polypyrrole coating was successfully deposited on anodized 2024 unclad aluminum alloy showing that the presence of the anodic film is the key factor to ensure better adhesion to the polymer coating. Corrosion resistance of the conductive polymer layers grown for three and five cycles were evaluated in a 3 wt.% NaCl solution using polarization curves and impedance spectroscopy. It was found that the thermally treated polymer coating with higher thickness (five cycles) exhibited the best corrosion performance. This best coating shifts the corrosion potential towards nobler values, about 650 mV, and the exchange current density decreases two orders of magnitude regarding the anodic layer. The partial reduction of the structure of the polymer promoted by the thermal treatment plays a key role in the corrosion resistance of the coating allowing to the thermally treated polymer layer to act as a physical barrier against corrosion. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：79 / 86

页数：8

共 33 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] Polypyrrole coatings on aluminum - synthesis and characterization [J].

Akundy, GS ;

Iroh, J .

POLYMER, 2001, 42 (24) :9665-9669

[3] Conducting polymers in microelectronics [J].

Angelopoulos, M .

IBM JOURNAL OF RESEARCH AND DEVELOPMENT, 2001, 45 (01) :57-75

[4] Surface characterisation of cerium layers on galvanised steel [J].

Arenas, MA ;

de Damborenea, JJ .

SURFACE & COATINGS TECHNOLOGY, 2004, 187 (2-3) :320-325

[5] FILMFORMING ELECTROPOLYMERIZATION OF PYRROLE ON IRON IN AQUEOUS OXALIC-ACID [J].

BECK, F ;

MICHAELIS, R ;

SCHLOTEN, F ;

ZINGER, B .

ELECTROCHIMICA ACTA, 1994, 39 (02) :229-234

[6] CORROSION OF SYNTHETIC METALS [J].

BECK, F ;

MICHAELIS, R .

WERKSTOFFE UND KORROSION-MATERIALS AND CORROSION, 1991, 42 (07) :341-347

[7] Conducting polymers electrodeposited on active metals [J].

Biallozor, S ;

Kupniewska, A .

SYNTHETIC METALS, 2005, 155 (03) :443-449

[8] THE ELECTROCHEMICAL-BEHAVIOR AND CORROSION OF ALUMINUM IN CHLORIDE MEDIA - THE EFFECT OF INHIBITOR ANIONS [J].

BRETT, CMA ;

GOMES, IAR ;

MARTINS, JPS .

CORROSION SCIENCE, 1994, 36 (06) :915-&

[9] Effect of molecular structure on the efficiency of amides and thiosemicarbazones used for corrosion inhibition of mild steel in hydrochloric acid [J].

Ebenso, EE ;

Ekpe, UJ ;

Ita, BI ;

Offiong, OE ;

Ibok, UJ .

MATERIALS CHEMISTRY AND PHYSICS, 1999, 60 (01) :79-90

[10] The effect of sodium molybdate on the pitting corrosion of aluminum [J].

Emregül, KC ;

Aksüt, AA .

CORROSION SCIENCE, 2003, 45 (11) :2415-2433

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