Abstract

The corrosion inhibition performance of Neem leaf (Azadirachita indica) extract on the corrosion of mild steel test specimen immersed in 0.5 M HCl and H₂SO₄ acids respectively at the ambient temperature of 30°C and elevated temperature of 80°C was investigated. The experimental work was performed by the use of weight loss method and the potential measurement technique. From the weight loss values, corrosion rates were determined by calculation. In the results obtained, the leaf extract, in sulphuric acid medium, gave its best corrosion inhibition performance at 0.50 g/l extract concentration at 30°C. A more appreciable corrosion inhibition performance was achieved in the dilute hydrochloric acid at 0.25 g/l extract concentration and also at 30°C.

Key words: Neem extract, corrosion, inhibition, corrosion rate, mild steel, weight loss, sulphuric and hydrochloric acids.