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Corrosion inhibitory effect of neem leaf extract on mild steel in alkaline solution containing chloride ions
Author : Payal Baitule and R. Manivannan*
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ABSTRACT
Inhibitory effect of the neem extract (Azadirachta indica) for mild steel in 1 wt% Ca(OH)2 + 0.5 wt% NaCl solution was studied by performing the gravimetric studies and Tafel study. The studies revealed that the corrosion inhibition efficiency rises with extract concentration. Inhibition efficiency increases up to 600 ppm then it stabilizes. Inhibition efficiency was found to be 86% at 600 ppm and increases with elevation in temperature. The decrease in activation energy (Ea) and enthalpy (ΔH) shows that corrosion inhibition is chemisorption and exothermic in nature respectively. Electrochemical experiments were performed with and without inhibitor and results were discussed. Result showed that neem leaf extract (Azadirachta indica) is a promising candidate to minimize the corrosion in alkaline medium, as it shows good inhibition efficiency.
KEYWORD
Mild steel, neem extract, alkaline medium, potentiodynamic polarization