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Two-step electrosynthesis of polypyrrole for corrosion protection of stainless steel

โœ Scribed by R. Zhu; G. Li; G. Huang

Publisher
John Wiley and Sons
Year
2009
Tongue
German
Weight
179 KB
Volume
60
Category
Article
ISSN
0947-5117

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โœฆ Synopsis

Abstract

Smooth polypyrrole (PPy) films were successfully electrosynthesized on a stainless steel (SS, 1Cr18Ni9) surface by a selfโ€catalytic twoโ€step process. SS substrate dissolution during PPy electrosynthesis was effectively depressed. The redox properties and corrosion behavior of PPy film coated SS electrodes were investigated by cyclic voltammetry, electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization. The reduction of PPy was found to include two reaction processes: an anion dedoping process and a cation insertion process. The PPy film was found to lose its electroactivity when polarized at high potentials due to peroxidation. EIS of SS/PPy mainly corresponds to PPy film response and charge transfer resistance decreases as film thickness increases, indicating that SS corrosion can be inhibited effectively by the PPy film.

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