studying different solvent systems on extraction performance of pomegranate peel extract as a green corrosion inhibitor for carbon steel in 15% hcl medium

Corrosion inhibition properties of pomegranate peel extract (ppe) extracted by water, water/ethanol and water/acetonitrile were investigated for carbon steel in 15 % hcl medium. according to the results of the total phenolic content (tpc) test, the highest tpc value was obtained in the extracted ppe with water-acetonitrile (1:2 v/v) compared to water and water-ethanol (1:2 v/v). the characterization of ppe was performed by tpc test, ft-ir and sem/edx. the corrosion protection efficiency was checked through weight loss, electrochemical impedance spectroscopy (eis), polarization, absorption isotherm, attenuated total reflectance (atr) and x-ray diffraction (xrd) analysis. the concentrations of 0.5, 1, 1.5, and 2 g/l of the inhibitor were investigated that the best result was acquired at concentration of 2 g/l. the polarization data confirmed that the resulting inhibitor behaved as a mixed type inhibitor with a dominant cathodic effect. according to the eis test, after 24 hours, the inhibitor efficiency at the optimal concentration was equal to 95 %. the sem- edx results confirmed the creation of a protective film on the metal surface. also, in the presence of the green inhibitor, xrd showed no rust products on the steel substrate.