Corrosion Inhibition of Steel in Petroleum Medium by Ficus Carica Leaves Extract
Keywords:
Natural product, inhibition, green inhibitor.Abstract
This work involves study the corrosion inhibition of steel in petroleum medium using alcoholic extracted of Ficus carica leaves with four concentrations of extracted (1, 3, 5 and 7mL/L) at four temperatures over the range 50 – 80 oC. Inhibition efficiency IE% results show that 3 and 5 mL/L the best concentrations which they gave efficiencies in the range of 71 – 80%. Thermodynamic functions of adsorption processes were calculated from experimental polarization data and the interpretation of the results reveals that Ficus carica extract Ficus carica extract obey Langmuir adsorption isotherm. Polarization curves indicate that Ficus carica extract is a mixed type inhibitor. The small values of the equilibrium constant of the adsorption-desorption process Kads refer to physical adsorption process. The values of free energy of adsorption ΔGoads, enthalpy ΔHoads and entropy ΔSoads were negative indicating the spontaneous and exothermic adsorption process as well as Ficus carica extract retained the metal ions and reducing the dissolution of steel and the activated complex in the rate determining step denotes an association rather than a dissociation step.
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