Table 6 EIS parameters obtained for mild steel in 1 M HCl in absence and presence of different concentrations of GPHs.
Inhibitor | Conc (mol/L) | Rs (Ω cm2) | Rct (Ω cm2) | n | Cdl (μF cm−2) | η% |
|---|---|---|---|---|---|---|
Blank | — | 1.12 | 9.58 | 0.827 | 106.21 | — |
GPH-1 | 2.88 × 10−5 | 1.10 | 25.45 | 0.905 | 78.70 | 62.35 |
5.76 × 10−5 | 1.25 | 65.73 | 0.881 | 77.67 | 85.42 | |
8.65 × 10−5 | 1.16 | 111.03 | 0.843 | 58.84 | 91.37 | |
10.15 × 10−5 | 1.41 | 170.38 | 0.835 | 55.74 | 94.37 | |
GPH-2 | 2.88 × 10−5 | 0.936 | 34.27 | 0.895 | 59.58 | 72.04 |
5.76 × 10−5 | 0.785 | 69.77 | 0.815 | 57.09 | 86.26 | |
8.65 × 10−5 | 0.89 | 127.01 | 0.846 | 56.27 | 92.45 | |
10.15 × 10−5 | 1.085 | 176.91 | 0.821 | 40.62 | 94.58 | |
GPH-3 | 2.88 × 10−5 | 1.13 | 39.05 | 0.871 | 57.72 | 75.46 |
5.76 × 10−5 | 0.74 | 75.15 | 0.853 | 55.00 | 87.25 | |
8.65 × 10−5 | 1.29 | 135.40 | 0.829 | 47.36 | 92.92 | |
10.15 × 10−5 | 1.67 | 265.72 | 0.845 | 37.41 | 96.39 |
