Table 6 EIS parameter values of C-steel corrosion in 1 M HCl without and with different concentrations at 303 K.
Conc. (ppm) | \(R_{s} \;\Omega .{\text{cm}}^{{\text{2}}}\) | \(R_{ct} \;\Omega {\text{cm}}^{{\text{2}}}\) | \(\:CPE\) µF cm− 2 | \(n_1\) | \(\:{C}_{c}\) µF cm− 2 | \(R_{po} \;\Omega .{\text{cm}}^{{\text{2}}}\) | \(n_2\) | IE % | θ | |
|---|---|---|---|---|---|---|---|---|---|---|
Blank | 0 | 1.73 | 83 | 8071 | 0.860 | 10,700 | - | 1.297 | - | - |
TAC 6 | 5 | 1.73 | 118 | 6330 | 0.142 | 200.0 | 6.97E-04 | 0.829 | 30.51 | 0.305 |
10 | 1.75 | 129 | 6170 | 0.149 | 144.0 | 3.88E-06 | 0.831 | 36.43 | 0.364 | |
20 | 1.79 | 149 | 6240 | 0.153 | 136.0 | 5.39E-06 | 0.815 | 44.97 | 0.450 | |
30 | 1.64 | 258 | 5670 | 0.178 | 64.00 | 1.01E-06 | 0.779 | 68.18 | 0.682 | |
40 | 2.14 | 335 | 2380 | 0.110 | 59.00 | 4.55E-07 | 0.869 | 75.52 | 0.755 | |
50 | 1.87 | 464 | 1960 | 0.103 | 56.00 | 9.30E-08 | 0.841 | 82.32 | 0.823 | |
TAC 18 | 5 | 1.68 | 270 | 1770 | 0.146 | 132.0 | 1.39E-09 | 0.803 | 69.63 | 0.696 |
10 | 1.94 | 461 | 1300 | 0.107 | 121.0 | 2.12E-10 | 0.855 | 82.21 | 0.822 | |
20 | 2.11 | 491 | 619.0 | 0.034 | 66.00 | 6.13E-10 | 0.801 | 83.30 | 0.833 | |
30 | 1.80 | 500 | 92.00 | 0.615 | 22.00 | 1.30E-10 | 0.935 | 83.60 | 0.836 | |
40 | 1.91 | 618 | 76.00 | 0.697 | 8.000 | 8.12E-11 | 0.981 | 86.73 | 0.867 | |
50 | 1.70 | 782 | 66.00 | 0.066 | 5.000 | 1.38E-12 | 0.005 | 89.51 | 0.895 |
