ABSTRACT

 The study has investigated the effect of the corrosion inhibition of mild steel in alkaline medium using organic inhibitors which include ethanol extract of Vernonia Amygdalina, Chromolaena Odorata, Azadirachta indica and producing a model to determine the corrosion penetration rate using the corrosion parameters of temperature, inhibitor concentration and time of exposure. 1'lic study therefore aimed to assess the effect of Vernonia Amygdalina extracts, Chromolaena Odorata extract, Azadirachta indica extract on corrosion inhibition of mild steel of 70mm x12it x 12mm immersed in 0.5M NaOH solution. A varied dose of organic extracts of 2m1,4m1,6m1,8rn1,lOml are used as an inhibitor in this study and weight loss was assessed for corrosion rate and set out a model that will control any variation of corrosion parameters. The results obtained show that various concentrations of the ethanol extract of the inhibitors were capable of inhibiting the corrosion of mild steel in NaOH meduim. The efficiency of inhibition of the extract was found to increase with increase in concentration o the inhibitors. This study reveals that Chromolaena Odorata and Azadirachta indica has a better inhibition property of 74% than the Vernonia amygdalina extract with efficiency of 70%. The results suggest that the ethanol extract of the inhibitors can actually be used as organic corrosion inhibitor.