Eco-Friendly Impact of Vernonia amygdalina asCorrosion Inhibitor on Aluminium in Acidic Media

Corrosion inhibition effect of Vernonia amygdalina extract on aluminium in 0.5 M HCl solution was stu died using gravimetric method at 40 o C temperature. Aluminium coupons of dimension 3x1.5 cm were immersed in test solutions of uninhibited acid and those containing extract conce ntrations of 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and 1.0 g /L concentration at intervals of 30 minutes progressively for 150 minut es. The results revealed that V. amygdalina could be used as an eco- friendly corrosion inhibitor for aluminium in HCl s olution. The corrosion inhibition efficiency of the extract increases with concentrations in the corrosion media. The surface coverage of the extract obeyed Langmuir adsorption isotherm. Hence, the corrosion inhibition effect of the extract was rationalized via adsorption mechanism.

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