Design of a new bilayer polypyrrole–xerogel hybrid coating for corrosion protection

Stéphane Roux; Pierre Audebert; Jacques Pagetti; Maxime Roche

doi:10.1039/B105060P

Stéphane Roux,^a Pierre Audebert,*^b Jacques Pagetti^a and Maxime Roche^c

* Corresponding authors

^a Laboratoire de Chimie des Matériaux et Interfaces, Pôle Traitements de Surface, Corrosion et Systèmes électrochimiques, Université de Franche-Comté, 16 Route de Gray–La Bouloie, Besançon, France

^b Laboratoire de Photophysique et Photochimie Supramoléculaires et Macromoléculaires (UMR CNRS 8531), Ecole Normale Supérieure de Cachan, 61 Avenue du Président Wilson, Cachan, France
E-mail: audebert@ppsm.ens-cachan.fr

^c Laboratoire de Chimie des Matériaux et Interfaces, Pôle Matériaux Moléculaires, Université de Franche-Comté, 16 Route de Gray–La Bouloie, Besançon, France

Abstract

In order to improve the anticorrosion protection properties of polypyrrole (PPy) films deposited on iron or mild steel, the organic conductive polymer was covered by a thermally and mechanically resistant xerogel layer. The anticorrosion protective effect of such a bilayered coating was evaluated by electrochemical measurements (i = f(E); E = f(t); polarization resistance (Rp)) in NaCl (30 g L⁻¹) and in HCl (1 M) aqueous solutions and by analysis of NaCl and HCl aqueous solutions in which samples coated by PPy and the xerogel were immersed for one and seven days. The results were compared with those obtained, in the same conditions, for naked mild steel plates, PPy or xerogel coated mild steel plates. The bilayer coating ensures a very efficient protection of mild steel against corrosion. A synergy between PPy and the xerogel was revealed. Moreover, the weak adherence of the xerogel on PPy was improved by the incorporation in the organic polymer of carboxylic acid-functionalized pyrrole units, and the corrosion protection of these modified layers was still increased.

Article information

https://doi.org/10.1039/B105060P

Article type

Paper

Submitted

08 Jun 2001

Accepted

04 Oct 2001

First published

30 Oct 2001

Download Citation

J. Mater. Chem., 2001,11, 3360-3366

Permissions

Request permissions