Table 4. EIS parameters for Q235 CS in 1.0 mol per L HCl without and with different concentrations of PBT at 298.15 K.
| Inhibitor | C/mmol L−1 | R S/Ω cm2 | CPEf | R f | CPEdl | R ct | R P | η | ||
|---|---|---|---|---|---|---|---|---|---|---|
| Y 0/μΩ Sn·cm2 | n 1 | Y 0/μΩ Sn·cm2 | n 2 | |||||||
| PBT | Blank | 1.200 ± 0.10 | 238.1 ± 7.20 | 0.9075 ± 0.01 | 27.50 ± 0.63 | 27.50 ± 0.63 | ||||
| 0.005 | 1.383 ± 0.05 | 70.75 ± 2.42 | 1 | 7.455 ± 0.91 | 233.7 ± 26.4 | 0.7442 ± 0.03 | 70.41 ± 5.61 | 77.87 ± 4.71 | 64.7% | |
| 0.01 | 1.361 ± 0.03 | 60.75 ± 2.48 | 1 | 8.321 ± 0.32 | 191.6 ± 44.8 | 0.7371 ± 0.02 | 116.9 ± 8.29 | 125.3 ± 7.97 | 78.1% | |
| 0.05 | 1.351 ± 0.02 | 44.79 ± 1.39 | 1 | 7.552 ± 3.75 | 136.8 ± 4.2 | 0.7275 ± 0.02 | 218.9 ± 6.15 | 226.4 ± 5.18 | 87.9% | |
| 0.25 | 1.349 ± 0.01 | 34.70 ± 2.54 | 1 | 13.77 ± 6.46 | 133.2 ± 30.1 | 0.7250 ± 0.03 | 314.5 ± 20.34 | 328.3 ± 14.3 | 91.6% | |
| 1.0 | 1.294 ± 0.01 | 30.94 ± 2.77 | 1 | 9.431 ± 3.27 | 121.5 ± 26.4 | 0.7141 ± 0.08 | 338.3 ± 5.18 | 347.7 ± 1.96 | 92.1% | |