Organic Coatings On Metal Surfaces For
Corrosion Protection
Author(s)
V. Branzoi, L. Pilan & F. Branzoi
Abstract
Polyaniline–polypyrrole composite coatings were formed on platinum and
titanium substrates by galvanostatic electrochemical polymerisation.
Electropolymerisation was done by varying the applied current and molar feed
ratio of monomers. It was shown that the structure, yield and the morphology of
the coatings were dependent on the feed ratio of monomers (aniline and pyrrole)
and the applied current or potential. As the oxidation potential of aniline and
pyrrole are very similar, we believe that simultaneous oxidation and codeposition
of polyaniline and polypyrrole is possible by changing the applied potential.
Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS)
were used to investigate the electrochemical properties of the resulting
composites.
1 Introduction
Electrochemical synthesis of conductive polymers allows preparation of layers of
polymers of desired thickness and shapes and dimensions generally not possible
by chemical methods [1].
Thus far most promising conductive polymers have been those made from
monomers of pyrrole, thiophene, aniline and benzene. These polymers can be
easily prepared electrolytically in organic or aqueous solutions. Conductivities
are usually in the semiconductor range [10-9 to 10-2 Scm-1]. In general, the
method of electrolysis affects to a great degree the electrical and physical
properties of the polymer [2-7]. Polypyrrole does not require added dopants to be
conductive [3]. This polymer switches between a black conductive form and a
Keywords
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