Author(s) :

Sadiq, A.S., Ayoola, O.D. , Aliyu, A.B..

Volume/Issue :

Abstract :

This research work presented the account of experimental investigation into the effectiveness of Neem (Azadirachta Indica) leaf extract as corrosion inhibitor for mild steel in 0.5M HCL solution.The mild steel (0.2%C) was cut and machined into twenty five (25) cylindrical corrosion coupons of 2cm diameter and 1cm height. Each of the coupons was immeresed in 0.5MHCL solution containing varying inhibitor concentrations of 0, 0.1, 0.3, 0.7, and 1.0 %v/v for an interval of 4days, 8days, 12days, 16days and 20 days respectively. Weight loss method was used to determine the corrosion rate and the inhibitor efficiency for each coupon within the specified period of interaction with corrosive medium. The mechanism of inhibition was adsorption where the adsorbed molecules of the inhibitor lie on the surface of the metal thereby blocking the active corrosion site on the steel against corrosion. It was found that within the experimental period, the adsorption of Neem leaf could reduce the corrosion of the steel in the 0.5M HCL solution and also the percentage inhibition increased with increase in the concentration of the inhibitor. Inhibitor with concentration of 1.0% v/v gave the lowest corrosion rate of 37.02 mils per year and the corresponding highest inhibition efficiency of 65. 1%. The neem leaf extract, to some degree, was found to be effective for inhibiting corrosion in mild steel in corrosive environment.

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