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In this paper, adsorption and thermodynamic study of the inhibition of corrosion of mild steel in 1M H2SO4 medium using ethanol extract of vernonia amygdalina was carried out using weight loss and IR methods of monitoring corrosion. The results reveal that ethanol extract of vernonia amygdalina inhibited corrosion of mild steel. The inhibition efficiency ranged from 83.91% to 89.11%, 81.09 % to 85.00%, 81.08% to 84.90% and 77.45% to 79.66% at 303, 313, 323 and 333K respectively. The inhibition efficiency of the extract increased as the concentration of the extract increases but decreased as temperature and time of immersion increases. The adsorption of the inhibitor on the surface of mild steel was found to be exothermic, spontaneous and consistent with the mechanism of physical adsorption as the value for heat of adsorption ranged from -35.22 to -42.90J/mol. The adsorption of the inhibitor followed the Langmuir isotherm. IR spectra of the corrosion product (without inhibitor), the extract and the corrosion product (with the inhibitor) confirmed that ethanol extract of vernonia amygdalina is an adsorption inhibitor.

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