The efficacy of the aqueous extracts of Ammodaucus leucotrichus fruits (E1 and E2) as corrosion inhibitors for C38 steel in 1M HCL solution has been studied by weight loss measurement as well as potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. From loss measurements, is clear that inhibition efficiency values were significantly increased with increasing both concentration of each inhibitor and temperature. Polarization measurements showed that the studied inhibitors are mixed type with significant reduction of cathodic and anodic current densities. The results of EIS measurements indicated that the corrosion of steel is mainly controlled by the charge transfer process. Various activation and adsorption thermodynamic parameters are evaluated and discussed. Linearity of Langmuir isotherm adsorptions indicated the monolayer formation of each inhibitor on C38 steel surface.
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