Arabian Journal of Chemistry · 2010 · 34 citations · 24 references
Natural SciencesChemical EngineeringMaterials ScienceCorrosion ScienceElectrochemistrySurface ScienceCorrosion ControlCorrosion EngineeringCorrosion InhibitorsCorrosion KineticsCorrosion MechanismsElectrochemical CorrosionCorrosion InhibitionCorrosion Inhibition MechanismsElectrochemical Impedance AnalysisElectrochemical Inhibition MechanismsEquivalent Circuit AnalysisEquivalent Circuit ModelingPolarizationPotentiodynamic Polarization
The inhibitive action of 4-methyl pyrazole (4MP) against the corrosion of iron (99.9999%) in solutions of hydrochloric acid has been studied using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). At inhibitor concentration range (10−3–10−2 M) in 1.0 M acid, the results showed that 4MP suppressed mainly the anodic processes of iron corrosion in 1.0 M HCl by adsorption on the iron surface according to Temkin adsorption isotherm. Both potentiodynamic and EIS measurements reveal that 4MP inhibits the iron corrosion in 1.0 M HCl and that the efficiency increases with increasing inhibitor concentration. Data obtained from EIS were analyzed to model the corrosion inhibition process through an equivalent circuit.
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