Table 2.
EIS corrosion parameters of C-steel electrode in the blank molar HCl solution and with the addition of varying concentrations DS036 and DS038 at 298 K.
| Inhibitor codes | Cinh. (mol/L) | Rs (Ω cm2) |
RP (Ω cm2) ± SD |
Cdl (F cm−2) × 10–6 |
QCPE |
χ2 × 10–4 |
θ | ηE (%) | |
|---|---|---|---|---|---|---|---|---|---|
| Y0 (μΩ−1 sn cm−2) | n | ||||||||
| Blank | 0.0 | 0.45 | 18.53 ± 1.1 | 710.9 | 90.39 | 0.717 | 5.21 | – | – |
| DS036 | 2.0 × 10–5 | 0.46 | 31.72 ± 3.5 | 285.7 | 56.84 | 0.792 | 4.28 | 0.415 | 41.5 |
| 5.0 × 10–5 | 0.65 | 40.79 ± 4.2 | 230.9 | 40.34 | 0.814 | 4.29 | 0.545 | 54.5 | |
| 1.0 × 10–4 | 0.77 | 84.73 ± 6.5 | 129.7 | 29.64 | 0.856 | 5.16 | 0.781 | 78.1 | |
| 5.0 × 10–4 | 0.79 | 201.41 ± 12.4 | 55.5 | 11.86 | 0.835 | 5.25 | 0.908 | 90.8 | |
| 1.0 × 10–3 | 0.85 | 363.64 ± 18.8 | 49.7 | 4.52 | 0.856 | 5.18 | 0.949 | 94.9 | |
| DS038 | 2.0 × 10–5 | 0.49 | 39.29 ± 2.9 | 226.9 | 43.37 | 0.801 | 5.11 | 0.528 | 52.8 |
| 5.0 × 10–5 | 0.57 | 48.42 ± 4.6 | 187.4 | 31.12 | 0.818 | 3.79 | 0.617 | 61.7 | |
| 1.0 × 10–4 | 0.69 | 103.73 ± 8.7 | 117.1 | 22.86 | 0.844 | 4.97 | 0.821 | 82.1 | |
| 5.0 × 10–4 | 0.76 | 247.91 ± 16.8 | 29.7 | 9.14 | 0.860 | 4.83 | 0.925 | 92.5 | |
| 1.0 × 10–3 | 0.98 | 463.15 ± 24.2 | 20.5 | 3.44 | 0.884 | 5.14 | 0.959 | 95.9 | |