الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 182 |  |  |
| | | from | 182 | | |
Abstract
Conducting polymers, such as polyaniline, poly-N,Ndimethylaniline
and poly-N,N-diethylaniline were chemically deposited
on platinum, brass and aluminum alloys surface by an anodic oxidation
under potentiostatic conditions. The electro-polymerization growth was
explained on the basis of oxide film formation of a valve metal; anodic
reaction, but not on the basis of the metal electro-deposition theory;
cathodic reaction. Some parameters such as, applied potential, electropolymerization
time, monomer type, dopant anions, electrolyte
composition and current density affected on the physical properties;
(ρ, _ cm), (σ, S cm-1),
o
K, , and ,F /m , of polymers prepared
potentiostatically.
The physical parameters of polymers calculated mathematically
from the curves of potentiostatic experiments. It was found that the
conductivity, permittivity and dielectric constant values of polyaniline are
major than poly-N,N-diethylaniline of all experiments associated with the
same conditions. The conductivity value of polyaniline coated brass in
H2SO4 is higher than in HCl. The permittivity and dielectric constant
values of polyaniline and poly-N,N-diethylaniline, prepared in H2SO4,
HCl and acetonitrile, increase with increasing the time of potentiostatic
polymerization. But the same parameters of polyaniline, prepared in
HNO3, increase with increasing the time of experiment.
iii
Tests for corrosion protection of the polymers coated and uncoated
brass substrate were investigated in 0.1 M NaCl solution. Tafel
polarization measurements showed, the studied polymers coating have
ability to protect the brass against corrosion. Some conditions of polymer
preparation affected on I.E.% (inhibition efficiency), io (exchange
current), and P (porosity) of the polymers coated brass in aggressive
medium of 0.1 M NaCl aqueous solution.All corrosion and electropolymerization
experiments were investigated at 30ºC in all electrolytes.