Green Inhibitors for the Acidic Corrosion of Steel

摘要

The effects of Alhagi Maurorum, Morusnigra and Apricot leaves extracts on the corrosion of steel in aqueous 0.5M H₂SO₄ were investigated by weight loss, thermometric, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) techniques. The corrosion rate of steel was measured in absence and presence of different concentrations of the three extracts, and the percentage inhibition of the different solutions were determined using the four techniques. Effects of solvent of extraction on the inhibition efficiencies of the three extracts were discussed. Theoretical Kinetic-Thermodynamic model of adsorption of the inhibitors on the metal surface was tested to fit the experimental data of the three extracts. The activation parameters of the corrosion reaction of steel with H₂SO₄ in the absence and the presence of the three extracts were determined. The correlations between the thermodynamic and kinetics data and molecular structure of the chemical conistituents of the three extracts were discussed.