Table 5 Tafel polarization parameters for mild steel in 1M HCl solution in absence and presence of different concentrations of GPHs.
Inhibitor | Conc (mol/L) | Ecorr (mV/SCE) | βa(mV/dec) | βc(mV/dec) | icorr (μA/cm2) | η% |
|---|---|---|---|---|---|---|
Blank | — | −445 | 70.5 | 114.6 | 1150 | — |
GPH-1 | 2.88 × 10−5 | −530 | 67.3 | 159.8 | 432.0 | 62.43 |
5.76 × 10−5 | −506 | 64.2 | 183.3 | 189.0 | 83.56 | |
8.65 × 10−5 | −555 | 64.2 | 90.50 | 103.0 | 91.04 | |
10.15 × 10−5 | −504 | 86.7 | 89.80 | 72.0 | 93.73 | |
GPH-2 | 2.88 × 10−5 | −534 | 65.5 | 161.1 | 344.0 | 70.08 |
5.76 × 10−5 | −481 | 66.4 | 139.7 | 178.0 | 84.52 | |
8.65 × 10−5 | −508 | 67.0 | 125.1 | 98.0 | 91.47 | |
10.15 × 10−5 | −461 | 59.9 | 129.9 | 67.9 | 94.09 | |
GPH-3 | 2.88 × 10−5 | −489 | 67.5 | 132.8 | 298.0 | 74.08 |
5.76 × 10−5 | −489 | 81.6 | 107.8 | 132.0 | 88.52 | |
8.65 × 10−5 | −554 | 93.5 | 153.8 | 83.0 | 92.78 | |
10.15 × 10−5 | −478 | 63.8 | 166.4 | 32.30 | 97.19 |
