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Effect of neem leaf (Azadirachita
indica) extract on the corrosion inhibition of mild
steel in dilute acids
C. A. Loto*, R. T. Loto and
A. P. I. Popoola
Department of Chemical and Metallurgical Engineering,
Tshwane University of Technology, Private Bag X680, Pretoria
0001, South Africa.
*Corresponding author. E-mail:
akinloto@gmail.com;
akinloto@yahoo.com;
lotoca@tut.ac.za.
Accepted 04 April, 2011 |
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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. |
