Table 3.
Kinetic parameters calculated from Tafel scan of all heat-treated plain carbon steels
| AISI Steel Grades | βa (mV-decade− 1) |
βc (mV-decade− 1) |
icorr (μA-cm− 2) |
Ecorr (mV) |
Corrosion Rate (mpy) |
|---|---|---|---|---|---|
| Annealing | |||||
| 1020 | 36.30 | 42.60 | 5.200 | - 594.0 | 2.378 |
| 1030 | 33.20 | 51.90 | 6.230 | - 566.0 | 2.845 |
| 1040 | 85.10 | 142.0 | 12.00 | - 648.0 | 5.500 |
| 1045 | 84.20 | 113.1 | 16.30 | - 545.0 | 7.352 |
| 1050 | 99.70 | 1331 | 21.20 | - 585.0 | 9.666 |
| Normalizing | |||||
| 1020 | 34.80 | 36.60 | 3.440 | - 660.0 | 1.571 |
| 1030 | 41.60 | 73.60 | 6.330 | - 579.0 | 2.892 |
| 1040 | 58.50 | 109.9 | 8.960 | - 625.0 | 4.095 |
| 1045 | 86.40 | 138.5 | 13.20 | - 546.0 | 5.940 |
| 1050 | 78.30 | 162.3 | 13.90 | - 583.0 | 6.362 |
| Quenching | |||||
| 1020 | 42.00 | 77.00 | 5.640 | - 683.0 | 2.576 |
| 1030 | 67.40 | 147.0 | 8.290 | - 640.0 | 3.786 |
| 1040 | 67.70 | 173.1 | 12.50 | - 638.0 | 5.725 |
| 1045 | 79.20 | 154.5 | 14.90 | - 572.0 | 6.719 |
| 1050 | 66.80 | 148.4 | 17.30 | - 586.0 | 7.889 |
| Austempering | |||||
| 1020 | 21.80 | 25.10 | 5.870 | - 627.0 | 2.681 |
| 1030 | 69.10 | 136.6 | 13.70 | - 600.0 | 6.275 |
| 1040 | 71.90 | 128.2 | 8.200 | - 626.0 | 7.747 |
| 1045 | 81.60 | 549.1 | 18.60 | - 610.0 | 8.381 |
| 1050 | 80.00 | 296.5 | 26.30 | - 582.0 | 12.12 |