the PEO treatment caused a good improvement in the
corrosion resistance with ennoblement in the corrosion
potential and a decrease of more than one order of magnitude
in the current density.
3.1.2 Electrochemical impedance spectroscopy
To better understand the corrosion characteristics of the
PEO coated specimens, EIS tests were performed on the
alloys treated at 0.1 and 0.45 A cm-2 for 60 s. The data
coming from EIS tests were fitted for quantitative evaluation
with the software Z-view using the equivalent circuit,
shown in Fig. 12. A good fitting quality was obtained, as it