Review Article
Corrosion Inhibition of Carbon Steel in HCl Solution by Some Plant Extracts
Table 3
Electrochemical impedance and Tafel 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 | — |
| | Murraya koenigii | 240.0 | 180.3 | 59.0 | 95.3 | 480 | 71.0 | 95.5 | | 300.0 | 256.2 | 58.2 | 96.6 | 469 | 48.0 | 96.9 | | 600.0 | 344.3 | 50.5 | 97.5 | 472 | 47.0 | 97.0 |
| | Aegle marmelos | 200.0 | 101.9 | 59.2 | 91.7 | 457 | 159.0 | 89.3 | | 300.0 | 151.1 | 44.1 | 94.4 | 466 | 100.0 | 93.5 | | 400.0 | 264.8 | 30.7 | 96.7 | 499 | 60.0 | 96.0 |
| | Andrographis paniculata | 300.0 | 99.0 | 56.9 | 91.4 | 489 | 82.0 | 94.6 | | 600.0 | 108.0 | 52.4 | 92.1 | 462 | 59.0 | 96.1 | | 1200.0 | 491.0 | 40.4 | 98.2 | 486 | 30.6 | 98.0 |
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