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The inhibition effect of three green inhibitors, Argan Oil (AO), Cosmetic Argan Oil (CAO) and Argan Hulls Extract (AHE), against copper corrosion in 2 M H3PO4 containing 3·10 M NaCl solutions were evaluated using conventional weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy. The weight loss results showed that all the three green inhibitors are excellent corrosion inhibitors, electrochemical polarizations data discovered the mixed mode of inhibition and the results of electrochemical impedance spectroscopy have shown that the change in the impedance parameters, charge transfer resistance and double layer capacitance, with the change in concentration of the inhibitors employed is due to the adsorption of the molecule leading to the formation of a protective layer on the surface of copper. The values of the inhibition efficiency calculated from these techniques are in reasonably good agreement.

international journal of corrosion and scale inhibition

Argania spinosa (L.) as a source of new and efficient green corrosion inhibitor for copper in acidic medium: a comparative study of three green compounds