Research Article
Effect of Caffeine-Zn2+ System in Preventing Corrosion of Carbon Steel in Well Water
Table 9
AFM data for carbon steel immersed in inhibited and uninhibited environments.
| | Samples | RMS () Roughness (nm) | Average () Roughness (nm) | Maximum peak-to-valley height (nm) |
| | Polished carbon steel (control) | 30 | 136 | 280 | | Carbon steel immersed in well water (blank) | 194 | 853 | 1725 | | Carbon steel immersed in well water + caffeine (200 ppm)-Zn2+ (50 ppm) | 117 | 464 | 972 | | Carbon steel immersed in well water + caffeine (200 ppm)-Zn2+ (50 ppm)-malic acid (25 ppm) | 155 | 612 | 1220 |
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