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The Corrosion Inhibition of Mild Steel in Sulphuric Acid Solution by Adsorption of African Perquetina Leaves Extract

Abdulrahman A. , Kareem A. Ganiyu, Ibrahim H. Kobe, Awe I. Caroline

The inhibition of mild steel corrosion in sulphuric acid solution was studied with application of Africa parquetina leaves extract (APLE) using Gravimetric, Gasometric and Thermometric measurements. The phytochemical characterization of the leaves extract were also carried out using Gas chromatography mass spectroscopy (GCMS) and Fourier transformation Infra Red (FTIR) analysis. The result showed the presence of phytochemical compounds and functional groups greatly contributed to the inhibitive strength. The inhibition efficiency at optimum concentration 0.5 g/l was 87.78 % and it was increased with the increase in concentration of APLE but decreased with increase in temperature. The adsorption of inhibitor obeyed Langmuir adsorption isotherm and the free energy of adsorption suggested that it was physisorption. Finally, the Dubinnin-Radushkevich isotherm model also suggested the techniques adopted in the corrosion measurement were in good agreement.