Table 2 EIS parameters and corrosion inhibition efficiencies obtained from fitting impedance spectra of C-steel in 0.5 M HCl at different concentrations of AEO7 at 20, 30, 40 and 50 °C using the electrical equivalent circuit shown in Fig. 4.
From: AEO7 Surfactant as an Eco-Friendly Corrosion Inhibitor for Carbon Steel in HCl solution
T (°C) | Cinh µmol L−1 | Rct, Ω cm2 | CPE | \(\theta \) | Corrosion IE% | ||
|---|---|---|---|---|---|---|---|
Y0 µsn ohm−1 cm−2 | Cdl, µF | n | |||||
20 | Blank | 43.1 | 257.0 | 119.7 | 0.855 | — | — |
20 | 128.2 | 211.7 | 82.57 | 0.793 | 0.664 | 66.4 | |
30 | 169.8 | 194.5 | 76.85 | 0.786 | 0.746 | 74.6 | |
35 | 253.0 | 161.4 | 69.31 | 0.791 | 0.830 | 83.0 | |
40 | 341.6 | 105.95 | 59.49 | 0.852 | 0.874 | 87.4 | |
30 | Blank | 30.8 | 381.8 | 218.7 | 0.889 | — | — |
20 | 90.42 | 314.1 | 202.2 | 0.890 | 0.660 | 66.0 | |
30 | 114.2 | 260.4 | 156.8 | 0.874 | 0.730 | 73.0 | |
35 | 164.5 | 236.8 | 103.6 | 0.797 | 0.813 | 81.23 | |
40 | 211.5 | 149.2 | 64.25 | 0.804 | 0.854 | 85.4 | |
40 | Blank | 24.27 | 425.0 | 252.7 | 0.898 | — | — |
20 | 64.8 | 405.7 | 231.0 | 0.866 | 0.625 | 62.5 | |
30 | 89.0 | 390.3 | 185.7 | 0.819 | 0.727 | 72.7 | |
35 | 112.2 | 377.0 | 141.9 | 0.764 | 0.786 | 78.6 | |
40 | 145.8 | 331.4 | 124.6 | 0.756 | 0.833 | 83.3 | |
50 | Blank | 18.5 | 606.5 | 295.6 | 0.862 | — | — |
20 | 49.27 | 554.2 | 254.1 | 0.822 | 0.622 | 62.2 | |
30 | 59.32 | 543.7 | 217.4 | 0.789 | 0.688 | 68.8 | |
35 | 69.72 | 515.7 | 187.7 | 0.890 | 0.734 | 73.4 | |
40 | 90.42 | 492.8 | 155.0 | 0.729 | 0.795 | 79.5 | |
