Table 2. Impedance Fitting Parameters for Al Alloy in 4 M NaOH Solution without and with Different Concentrations of CPC.
| CPE1 |
CPE2 |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| C (mM) | Rs (Ω cm2) | Y0 (10–4 S sn cm–2) | n1 | Rct,1 (Ω cm2) | L (10–4 H cm2) | RL (Ω cm2) | Y0 (10–2 S sn cm–2) | n2 | Rct,2 (Ω cm2) | Rp (Ω cm2) | χ2 (10–3) |
| blank | 0.715 | 1.052 | 1.000 | 0.347 | 2.012 | 0.847 | 4.990 | 1.000 | 0.193 | 0.439 | 0.743 |
| 0.5 | 0.736 | 1.060 | 1.000 | 0.435 | 3.003 | 1.150 | 5.903 | 1.000 | 0.201 | 0.517 | 1.634 |
| 1.0 | 0.834 | 1.021 | 1.000 | 0.458 | 6.286 | 1.306 | 5.464 | 1.000 | 0.221 | 0.560 | 1.043 |
| 3.0 | 0.897 | 0.892 | 1.000 | 0.515 | 6.508 | 1.357 | 6.591 | 0.956 | 0.223 | 0.596 | 2.679 |
| 5.0 | 0.932 | 0.852 | 1.000 | 0.541 | 4.099 | 1.364 | 8.321 | 0.931 | 0.225 | 0.612 | 2.213 |