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The inhibition efficiency and adsorption mechanism of kola nitida leaves extracts on mild steel protection in 2M HCl at various concentration, exposure time and working temperature was studied using Weight loss measurement. The results showed that ethanol extract of Kola nitida leaves is a good inhibitor for the corrosion of mild steel in acidic medium. The corrosion rate of mild steel decreases with increase in the concentration of the extract. The inhibition efficiency increases progressively as the concentration of the extract increases but decreases with rise in temperature and exposure time. The highest inhibition efficiency observed in the presence of the extract was 88.51%. The kinetics of the reaction in the presence of the extracts revealed that it follows a first-order reaction and the half-life increases as the concentration of the extract increases. Adsorption studies revealed that Langmuir adsorption isotherm is the best adsorption model applicable to the adsorption of the extract on mild steel surface.

Concentration, Temperature and Kinetic Studies of <i>Kola nitida</i> Leaves Extract in Corrosion Prevention