Table 4 Impedance data for mild steel in 3.5% NaCl solution without and with different concentrations (50, 100, 150, and 200 ppm) of hexane and acetone extracts at 298 K.
Inhibitor | Conc. (ppm) | RS (Ωcm2) | Rct (Ωcm2) | n | 106 Y0 (F/cm2 sn−1) | Fitting error | Cdl (µF/cm2) | η (%) |
|---|---|---|---|---|---|---|---|---|
Blank | – | 4.32 | 145.46 | 0.81 | 415.91 | 0.07 | 183.08 | – |
Hexane extract | 50 | 28.59 | 1710.36 | 0.95 | 27.84 | 0.17 | 25.24 | 74.41 |
100 | 15.27 | 1742.18 | 0.96 | 653.29 | 0.07 | 62.64 | 82.24 | |
150 | 9.21 | 2244.21 | 0.53 | 311.19 | 0.06 | 90.75 | 90.07 | |
200 | 5.63 | 2714.52 | 0.74 | 13.77 | 0.12 | 13.59 | 97.91 | |
Acetone extract | 50 | 17.69 | 1058.23 | 0.97 | 24.36 | 0.17 | 22.24 | 62.50 |
100 | 9.54 | 1088.85 | 0.98 | 571.62 | 0.08 | 54.47 | 70.21 | |
150 | 5.08 | 1233.37 | 0.56 | 272.29 | 0.07 | 79.24 | 77.91 | |
200 | 3.07 | 1480.94 | 0.74 | 12.04 | 0.12 | 12.20 | 85.62 |
