Research Article
Effect of Caffeine-Zn2+ System in Preventing Corrosion of Carbon Steel in Well Water
Table 7
Influence of pH on IE of caffeine (200 ppm)-Zn2+ (50 ppm)-malic acid (25 ppm).
| System | pH | CR (mdd) |
IE (%) | Presence of inhibitor | Absence of inhibitor |
| Caffeine (200 ppm)-Zn2+ (50 ppm)-malic acid (25 ppm). | 3 | 71.73 | 88.56 | 19 | 5 | 49.24 | 72.41 | 32 | 7 | 24.55 | 52.23 | 53 | 8 | 8.97 | 22.42 | 60 | 11 | 1.30 | 10.81 | 88 |
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