Table 2 The weight loss parameters obtained for mild steel in 1 M HCl containing different concentrations of GPHs.
Inhibitors | Conc (mol/L) | Weight loss (mg) | CR (mg cm−2 h−1) | Inhibition efficiency (η %) | Surface coverage (θ) |
|---|---|---|---|---|---|
Blank | — | 230 | 7.66 | — | — |
GPH-1 | 2.88 × 10−5 | 78 | 2.60 | 66.08 | 0.6608 |
5.76 × 10−5 | 38 | 1.26 | 83.47 | 0.8347 | |
8.65 × 10−5 | 22 | 0.73 | 90.43 | 0.9043 | |
10.15 × 10−5 | 14 | 0.46 | 93.91 | 0.9391 | |
GPH-2 | 2.88 × 10−5 | 63 | 2.10 | 72.60 | 0.7260 |
5.76 × 10−5 | 29 | 0.96 | 87.39 | 0.8739 | |
8.65 × 10−5 | 16 | 0.53 | 93.04 | 0.9304 | |
10.15 × 10−5 | 11 | 0.36 | 95.21 | 0.9521 | |
GPH-3 | 2.88 × 10−5 | 58 | 1.93 | 74.78 | 0.7478 |
5.76 × 10−5 | 21 | 0.70 | 90.86 | 0.9086 | |
8.65 × 10−5 | 10 | 0.33 | 95.65 | 0.9565 | |
10.15 × 10−5 | 5 | 0.16 | 97.82 | 0.9782 |
