Review Article
Corrosion Inhibition of Carbon Steel in HCl Solution by Some Plant Extracts
Table 5
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 | — |
| | Piper longum | 240.0 | 213.2.1 | 46.4 | 96.0 | 464 | 53.0 | 96.5 | | 300.0 | 273.3 | 33.1 | 96.9 | 469 | 46.0 | 96.9 | | 600.0 | 355.5 | 27.3 | 97.6 | 479 | 41.0 | 97.3 |
| | Moringa oleifera | 200.0 | 215.0 | 43.0 | 96.0 | 503 | 59.0 | 96.1 | | 250.0 | 324.5 | 41.4 | 97.3 | 472 | 38.0 | 97.5 | | 300.0 | 644.9 | 32.4 | 98.6 | 493 | 28.0 | 98.1 |
| | Citrus aurantium | 300.0 | 23.5 | 68.5 | 68.9 | 466 | 430.0 | 72.0 | | 600.0 | 58.2 | 65.4 | 85.4 | 515 | 212.0 | 86.2 | | 1200.0 | 65.2 | 56.3 | 87.0 | 464 | 160.0 | 89.6 |
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