The potentiodynamic polarization curves of the coated steel
after 40 days of immersion in 3.5% NaCl are shown in Fig. 5. Current
densities at Ecorr (Icorr), were determined by extrapolating the Tafel
lines at Ecorr. The values of the corrosion potential (Ecorr) and corrosion
current (Icorr) are listed in The values of Icorr must
be interpreted with caution because some of the measured current
density at Ecorr for the PANI based paints may have resulted from
the redox properties of PANI A positive shift in Ecorr of +200
to + 400 mV can be noted when PANI is incorporated to the coating
formulation. While there is not a clear trend between Ecorr and
PANI loading in the case of LS1 and LS2 dopants, a clear decrease by
as much as −200 mV is observed when PANI–BS content increases from 1.5% to 3%