Electrochemical study on the effectively of Hyoscyamus Muticus Extract as a green inhibitor for corrosion of copper in 1 MHNO3

Hyoscyamus muticus extract (hme),was investigated as a green corrosion inhibitor for copper in 1 m hno3 solution using weight loss,potentiodynamic polarization,electrochemical impedance spectroscopy (eis) and electrochemical frequency modulation (efm) techniques. surface morphology was tested using scanning electron microscope (sem). the effect of the temperature on corrosion behavior with addition of different concentrations was studied in the temperature range of 25-45 °c by weight loss. polarization curves reveal that the investigated extract is a cathodic behavior. the inhibition efficiency was found to increase with increase in the investigated extract concentration and decrease with increase in solution temperature. the adsorption of the inhibitor on copper surface was found to obey the langmuir's adsorption isotherm. the activation and adsorption parameters were calculated and discussed. the results obtained from chemical and electrochemical techniques are in good agreement.