In
this
study
films
of
polypyrrole/sodium
dodecylbenzene
sulfonate
(PPy/SDBS)
were
electropolymerised
on
the
surface
of
platinum
to
determine
their
chemical
and
physical
characteristics
and
on
AA
1100
alloy
to
evaluate
their
performance
in
terms
of
corrosion
protection
of
the
alloy
in
chloride
solutions.
The
char-
acterization
of
the
films
was
performed
by
scanning
electron
microscopy
(SEM),
X-ray
diffraction
(XRD),
infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC)
and conductivity measurements. The XRD and FT-IR analysis of the PPy/SDBS films showed that the SDBS
confers a higher degree of order to the PPy deposits, this effect being evident from the relatively high
value obtained for the electrical conductivity of the films. Moreover, the films presented environmen-
tal stability with conductivity values remaining stable even after 60 days of air exposure. The thermal
analysis showed that the PPy/SDBS film is amorphous and degrades without melting. The corrosion pro-
tection of the films produced on the AA 1100 surface was evaluated using electrochemical impedance
spectroscopy (EIS) and potentiodynamic polarization tests in 0.05 mol L−1 NaCl and 0.05 mol L−1 HCl solu-
tions. The potentiodynamic polarization curves of the PPy/SDBS coatings produced on the AA 1100 surface
evidenced
a
shift
of
the
corrosion
potential
to
more
positive
values
and
a
decrease
of
the
corrosion
current
density,
indicating
an
improve
on
the
corrosion
resistance.