Figure 6
From: AEO7 Surfactant as an Eco-Friendly Corrosion Inhibitor for Carbon Steel in HCl solution

EIS Nyquist plots for C-steel in 0.5 M HCl at 20 C with 0, 1, 2.5, 5, 7.5, 10 × 10−3 M of KI in the (A) absence and (B) presence of 40 µmol L−1 of AEO7. Solid lines are the fittings that are done using the equivalent circuit shown in Fig. 4 while the symbols are the measured data.