Table 3: Results from the anodic polarization curves of the samples.
| Sample | Ecorr (V) | Icorr (A/cm2) | Eb (V) |
| 440C | -0.492 | 4.288 × 10-5 | -0.416 |
| Nb440C | -0.448 | 8.995 × 10-6 | -0.321 |
| Nb440C + 0.15%C | -0.448 | 2.207 × 10-5 | -0.341 |
| Nb440C + 0.3%C | -0.47 | 2.99 × 10-5 | -0.386 |
| Nb440C + 0.45%C | -0.478 | 4.25 × 10-5 | -0.389 |