Comparison of the Inhibitive Effects of Neem (Azadirachta indica) Leaves Extract and Benzamide in Tetraoxosulphate (VI) Acid Solution

A comparison of the inhibitive effects of Neem (Azadirachta indica) leaves extract and Benzamide in 0.5 M tetraoxosulphate (VI) acid was undertaken using the weight loss method of corrosion measurement. This was aimed at determining which of the inhibitors will function optimally in 0.5 M H2SO4 acid solution. Neem leaves extract offered better corrosion inhibition performance in the acid medium compared to Benzamide. The corrosion rate of mild steel in the acidic environment with Neem leaves extract as an inhibitor was lower compared to the corrosion rate of mild steel in the acidic medium with Benzamide as an inhibitor.The inhibition efficiency of Neem leaves extract was higher compared to Benzamide. The mean corrosion rate of mild steel in the acidic environment with Benzamide and Neem leaves extract as inhibitors were 74.06 mm/day and 66.29 mm/day respectively. The mean inhibition efficiency of Neem leaves extract and Benzamide were 21.37 % and 10.21 % respectively in 0.5 M H2SO4 acid solution from the results of weight loss measurement. For optimum corrosion inhibition performance, Neem leaves extract is recommended.