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Corrosion inhibition efficiencies of holy basil on Al in HCl solution were studied by weight loss and ther- mometric methods in presence and in absence of stem extract of three different varieties of holy basil viz. ocimum basilicum (EB), ocimum canum (EC) and ocimum sanctum (ES). Inhibition efficiency increases with the increasing concentration of stem extract and decreases with increases in acid strength. Results show that all varieties under study are good corrosion inhibitors, among which, EB is most effective. Maximum inhibition efficiency was found 97.09% in 0.5N HCl solution with 0.6% stem extract. The Langmuir adsorption isotherm indicates that surface coverage also increases with increasing in the concentration of extract of stem in HCl solution.

Study on Corrosion Inhibition Efficiency of Stem Alkaloid Extract of Different Varieties of Holy Basil on Aluminium in HCl Solution