Effect of Caffeine‐Zn2+ System in Preventing Corrosion of Carbon Steel in Well Water

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Abstract
The inhibition efficiency (IE) of caffeine in controlling corrosion of carbon steel in well water in the absence and presence of Zn2+ has been evaluated by mass loss method. The formulation, consisting of 200 ppm of caffeine and 50 ppm Zn2+, offers 82% inhibition efficiency to carbon steel immersed in well water. Addition of malic acid increases inhibition efficiency of the caffeine‐Zn2+ system. The inhibition efficiency of caffeine‐Zn2+ and caffeine‐Zn2+‐malic acid system decreases with the increase in immersion period and increases with the increase in pH from 3 to 11. AC impedance spectra, SEM micrographs, and AFM studies reveal the formation of protective film on the metal surface. The film is found to be UV fluorescent.
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  • University Grants Commission

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