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Two‐step electrosynthesis of polypyrrole for corrosion protection of stainless steel
Author(s) -
Zhu R.,
Li G.,
Huang G.
Publication year - 2009
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.200805031
Subject(s) - electrosynthesis , polypyrrole , cyclic voltammetry , dielectric spectroscopy , materials science , corrosion , dissolution , electrochemistry , redox , substrate (aquarium) , polarization (electrochemistry) , chemical engineering , electrode , inorganic chemistry , metallurgy , composite material , chemistry , polymer , polymerization , oceanography , engineering , geology
Smooth polypyrrole (PPy) films were successfully electrosynthesized on a stainless steel (SS, 1Cr18Ni9) surface by a self‐catalytic two‐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.