Table 3.
Potentiodynamic polarization parameters (derived from Fig. 5) for C-steel in 0.5 M HCl in the presence of 0, 20, 30, 35, 40 μmol L−1 of AEO7 corrosion inhibitor at different temperatures.
| T (°C) | Cinh µmol L−1 | −Ecorr (mV) SCE | icorr (µA cm−2) | βa, mV decade−1 | βc, mV decade−1 | Rp, Ω cm2 | CR, mm year −1 | IE % | |
|---|---|---|---|---|---|---|---|---|---|
| 20 | Blank | 496.0 | 624 | 152.8 | 164.8 | 55.2 | 7.24 | — | — |
| 20 | 478.0 | 194 | 97.2 | 157.9 | 130.1 | 2.25 | 0.68 | 68.91 | |
| 30 | 460.0 | 130 | 87.8 | 148.6 | 199.9 | 1.5 | 0.80 | 80.40 | |
| 35 | 458.0 | 71.5 | 68.1 | 123.6 | 266.9 | 0.83 | 0.88 | 88.54 | |
| 40 | 417.0 | 45.5 | 40.1 | 112.6 | 282.5 | 0.52 | 0.92 | 92.70 | |
| 30 | Blank | 499.0 | 1056 | 202.2 | 192.8 | 40.6 | 12.26 | — | — |
| 20 | 487.0 | 353.68 | 122 | 173.3 | 88.01 | 4.1 | 0.66 | 66.5 | |
| 30 | 471.0 | 250.9 | 107.5 | 162.9 | 127.9 | 2.91 | 0.79 | 79.3 | |
| 35 | 467.0 | 150.4 | 85.5 | 148.5 | 156.8 | 1.74 | 0.85 | 85.75 | |
| 40 | 470.0 | 95.8 | 56.8 | 129 | 178.9 | 1.11 | 0.90 | 90.92 | |
| 40 | Blank | 513.0 | 1640 | 249.5 | 328.4 | 37.5 | 19.04 | — | — |
| 20 | 487.0 | 567 | 211.2 | 272.1 | 91.1 | 6.58 | 0.65 | 65.42 | |
| 30 | 464.0 | 419 | 183.5 | 250.5 | 122.1 | 4.86 | 0.77 | 77.45 | |
| 35 | 457.0 | 277 | 149.5 | 225.7 | 141.1 | 3.21 | 0.83 | 83.10 | |
| 40 | 469.0 | 166 | 93.8 | 143.9 | 148.7 | 1.92 | 0.89 | 89.87 | |
| 50 | Blank | 518.0 | 2440 | 423 | 352 | 34.2 | 28.34 | — | — |
| 20 | 522.0 | 896 | 281 | 323.9 | 73.0 | 10.4 | 0.63 | 63.27 | |
| 30 | 480.0 | 650 | 183.1 | 285.3 | 80.8 | 7.54 | 0.75 | 75.36 | |
| 35 | 486.0 | 425 | 98.1 | 260.6 | 68.8 | 4.93 | 0.81 | 81.70 | |
| 40 | 492.0 | 301 | 44.9 | 235.3 | 54.4 | 3.49 | 0.78 | 87.66 |