Studying Different Solvent Systems on Extraction Performance of Pomegranate Peel Extract as a Green Corrosion Inhibitor for Carbon Steel in 15% HCl Medium
نویسندگان
1 Department of Applied Chemistry, Faculty of Chemistry, University of Guilan, P.O. Box: 41635-1914, Rasht, Iran.
2 Department of Applied Chemistry, Faculty of Chemistry, University of Guilan, P.O. Box: 41635-1914, Rasht, Iran.
doi
10.30509/pccc.2025.167460.1358چکیده
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.
