Review Article
Corrosion Inhibition of Carbon Steel in HCl Solution by Some Plant Extracts
Table 4
Electrochemical impedance, Tafel, and linear polarization resistance data at 308 K.
| | Name of inhibitor | Inhibitor concentration | (Ω cm2) | (μF cm−2) | E (%) | (mV versus SCE) | (mA/cm2) | E (%) |
| | 1 M HCl | — | 8.5 | 68.9 | — | 446 | 1540.0 | — |
| | Syzygium cumini | 240.0 | 97.1 | 67.6 | 91.2 | 443 | 165.0 | 89.2 | | 300.0 | 117.5 | 56.1 | 92.7 | 462 | 98.0 | 93.5 | | 600.0 | 238.5 | 53.7 | 96.4 | 469 | 60.0 | 96.0 |
| | Pongamia pinnata | 300.0 | 129.5 | 39.6 | 92.9 | 461 | 84.0 | 94.0 | | 350.0 | 150.6 | 38.7 | 93.5 | 482 | 77.0 | 95.0 | | 400.0 | 239.8 | 35.7 | 96.5 | 471 | 49.0 | 97.0 |
| | Strychnos nuxvomica | 250.0 | 130.3 | 52.0 | 93.5 | 461 | 132.0 | 91.4 | | 300.0 | 159.9 | 47.1 | 94.7 | 463 | 97.0 | 93.7 | | 350.0 | 263.9 | 43.3 | 96.7 | 494 | 27.5 | 98.2 |
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