Table 3 Fitted electrochemical parameters deduced from EIS tests for Carbon steel in H2S and 1M HCl co-existing solution without and with different concentrations of BMT at 293K.
Concentration (ppm) | EOCP (V) | Phase angle maxima (deg) | Rs | Y1 | n1 | Rf | Y2 | n2 | Rct | Rp | η% |
|---|---|---|---|---|---|---|---|---|---|---|---|
0 | − 0.45472 | 27.89 | 4.34 | / | / | / | 385.9 | 0.877 | 9.7 | 9.7 | – |
0.3 | − 0.44305 | 56.96 | 2.909 | 126.7 | 0.902 | 9.4 | 192.6 | 0.772 | 99.4 | 108.8 | 91.1 |
0.6 | − 0.44066 | 58.11 | 2.76 | 107.5 | 0.931 | 11.1 | 266.7 | 0.748 | 102.2 | 113.3 | 91.4 |
0.9 | − 0.43087 | 60.00 | 2.51 | 115.4 | 0.927 | 17.1 | 234.1 | 0.735 | 109.2 | 249.9 | 96.1 |
3.0 | − 0.40837 | 64.05 | 2.367 | 166.6 | 0.861 | 23.8 | 210.4 | 0.520 | 277.4 | 370.0 | 97.3 |
6.0 | − 0.40482 | 65.93 | 2.413 | 131.4 | 0.879 | 25.5 | 542.9 | 0.313 | 401.8 | 427.3 | 97.7 |
9.0 | − 0.40397 | 67.18 | 2.519 | 119.6 | 0.857 | 18.6 | 400.2 | 0.229 | 488.2 | 490.1 | 98.0 |
