Table 3 Carbon steel's polarization features and the efficiency of inhibition by new surfactants in a 1.0 M HCl solution.
Cpd | Conc M | Ecorr (mV vs SCE) | jcorr (μAcm−2) | βa (mV dec−1) | − βc (mV dec−1) | Pj% |
|---|---|---|---|---|---|---|
Blank | − 537 ± 1.2 | 784.0 ± 3.5 | 95.2 | 124.9 | – | |
GSC12 | 5 × 10−5 1 × 10−4 5 × 10−4 1 × 10−3 5 × 10−3 10 × 10−3 | − 530 ± 1.1 − 522 ± 1.3 − 503 ± 0.9 − 498 ± 1.8 − 483 ± 2.0 − 479 ± 1.7 | 631.9 ± 2.8 575.4 ± 4.4 304.2 ± 3.7 228.1 ± 2.9 119.9 ± 1.9 80.7 ± 2.3 | 91.4 90.9 88.2 81.9 78.3 80.3 | 120.4 145.8 132.7 117.3 104.9 111.4 | 19.4 26.6 61.2 70.9 84.7 89.7 |
GSC16 | 5 × 10−5 1 × 10−4 5 × 10−4 1 × 10−3 5 × 10−3 10 × 10−3 | − 523 ± 1.1 − 510 ± 2.5 − 498 ± 1.9 − 484 ± 1.3 − 480 ± 0.9 − 473 ± 1.7 | 594.2 ± 5.5 544.0 ± 3.4 275.9 ± 1.8 221.8 ± 2.5 88.6 ± 3.6 62.7 ± 4.6 | 93.5 87.4 68.3 77.8 71.5 70.9 | 127.4 120.4 119.4 134.8 99.8 114.6 | 24.2 30.6 64.8 71.7 88.7 92.0 |
GSC18 | 5 × 10−5 1 × 10−4 5 × 10−4 1 × 10−3 5 × 10−3 10 × 10−3 | − 515 ± 1.8 − 494 ± 2.2 − 476 ± 1.9 − 460 ± 1.9 − 446 ± 1.2 − 424 ± 1.3 | 575.9 ± 5.1 501.3 ± 3.8 229.4 ± 2.8 173.6 ± 3.7 69.2 ± 1.1 35.4 ± 1.3 | 87.4 75.8 88.3 92.3 89.6 82.5 | 137.3 126.3 133.9 145.2 129.6 122.3 | 26.5 36.0 70.7 77.8 91.1 95.4 |
