Table 4.
Polarization parameters for Harmal extract on C-steel in 0.25 M H2SO4 medium.
| Harmal Extract ppm |
icor mA cm−2 |
Ecor (V) vs. SCE | βc mV dec−1 |
βa mV dec−1 |
θ | IE% |
|---|---|---|---|---|---|---|
| 0 | 12.70 | −642.9 | −580.9 | 794.4 | 0.000 | 0.0 |
| 20.79 | 12.60 | −583.3 | −610.5 | 712.8 | 0.008 | 0.8 |
| 41.19 | 12.41 | −607.1 | −474.1 | 690.7 | 0.023 | 2.3 |
| 62.11 | 10.00 | −666.7 | −480.7 | 705.1 | 0.213 | 21.3 |
| 82.65 | 9.06 | −761.9 | −423.1 | 808.1 | 0.286 | 28.6 |
| 204.10 | 8.12 | −785.7 | −390.8 | 791.1 | 0.361 | 36.1 |
| 283.40 | 6.32 | −738.0 | −364.1 | 680.2 | 0.502 | 50.2 |
| 513.83 | 6.02 | −785.7 | −294.1 | 758.1 | 0.526 | 52.6 |
| 625.00 | 6.65 | −812.5 | −309.7 | 791.8 | 0.477 | 47.7 |
| 826.50 | 6.45 | −785.7 | −340.9 | 748.5 | 0.493 | 49.3 |