Table 5.
Percent inhibition efficiency (IE%) toward C-steel corrosion by extract of Harmal, Psidium Guajava, Tephrosia purpurea and Aegle marmelos leaves at various concentration C (ppm).
| CHarmal (ppm) This Work |
IE% | CPsidium Guajava (ppm) [22] |
IE% | CTephrosia purpurea (ppm) [63] | IE% | CAegle marmelos (ppm) [64] | IE% |
|---|---|---|---|---|---|---|---|
| 0 | - | 0 | - | 0 | 0 | ||
| 20.79 | - | 20 | 15 | 50 | 56.3 | 100 | 68.05 |
| 41.49 | 87.9 | 50 | 21 | 100 | 65.2 | 200 | 72.21 |
| 62.11 | - | 200 | 49 | 150 | 77.7 | 300 | 74.45 |
| 82.65 | 94.7 | 400 | 80 | 200 | 89.4 | 400 | 76.69 |
| 204.1 | 96.9 | 800 | 82 | 250 | 91.3 | 500 | 81.85 |
| 283.4 | 98.1 | 1200 | 82 | 300 | 92.5 | - | - |
| 625.0 | 98.2 | - | - | 350 | 91.1 | - | - |
| 826.5 | 98.5 | - | - | 400 | 90.9 | - | - |