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Corrosion Inhibition and Adsorption Behaviour of Methanol Extract of Spondias cytherea leaves on Mild Steel Corrosion in 5.0M H2SO4

Obike Anthony I, Emeruwa Chigbundu N*, Ajiwe Vincent IE, Igwe Jude C

The corrosion inhibition of mild steel in 5.0M sulphuric acid solutions by crude extracts of Spondias cytherea leaves (S.C) were studied using gravimetric and gasometric techniques. The results showed that S.C. can serve as a corrosion inhibitor in acid medium. Inhibition efficiencies (%I) of the S.C extract were found to reach 67.72 % and 72.00% for gravimetric and gasometric analyses respectively. The corrosion inhibition efficiency increased with increase in the concentration of the extracts and decreased with the increase in time and temperature. The corrosion inhibition efficiency exhibited by the S.C leaves extract is attributed to the stronger adsorption of the phytochemicals present in the plant extracts unto the mild steel. The mechanism of adsorption proposed for the S.C extract is physical adsorption. The corrosion inhibition of the leaves’ extracts followed Langmuir and Freundlich isotherm.