Table 1 The computer-fitted results of impedance spectrum of the steel electrode, which was polarized cathodically for three hours in a CaCl2 brine solution with varying amounts of Casein and Rhamnolipids.
Scale inhibitor | Conc. | Rs | Q | n | Rct | % Inhibition |
|---|---|---|---|---|---|---|
ppm | ohm.cm2 | µF | Ohm.cm2 | |||
Blank | 0 | 9.15 ± 0.074 | 149.9 ± 0.836 | 0.675 | 2207 ± 25.1 | – |
Rhamnolipid | 50 | 7.859 ± 0.052 | 337.7 ± 1.94 | 0.78 | 1430 ± 18.6 | 35.20% |
100 | 4.46 ± 0.195 | 51 ± 2.28 | 0.602 | 419 ± 7.3 | 81% | |
200 | 5.01 ± 0.048 | 27 ± 3.36 | 0.729 | 427 ± 4.9 | 80.60% | |
Casein | 50 | 5.91 ± 0.038 | 613 ± 7.63 | 0.706 | 1464 ± 29.2 | 33.60% |
100 | 6.12 ± 0.042 | 400 ± 5.38 | 0.724 | 1140 ± 16.0 | 48.30% | |
200 | 63.47 ± 0.68 | 327.6 ± 7.47 | 0.76 | 971.6 ± 16.9 | 56% | |
300 | 9.96 ± 0.062 | 276 ± 4.18 | 0.767 | 1130 ± 14.5 | 48.80% |
