Ethanolic Mangifera Indica Leaves Extract as Green Corrosion Inhibitor

• Main Authors: Rihashni, Thivagaran, Nurjannah, Salim, Nurul Huda, Abu Bakar
• Format: Article
• Language: English
• Published: Penerbit Akademia Baru 2023
• Subjects: QC Physics; R Medicine (General)
• Online Access: http://umpir.ump.edu.my/id/eprint/37885/1/Ethanolic%20Mangifera%20Indica%20Leaves%20Extract%20as%20Green%20Corrosion%20Inhibitor.pdf; http://umpir.ump.edu.my/id/eprint/37885/; https://doi.org/10.37934/araset.29.3.228234

Mangifera indica (MI) or mango leaf as a green corrosion inhibitor for copper has been studied. The MI was extracted in ethanol solvent and prepared at different concentrations of 0, 0.4, 0.6 and 0.8 mg/ml in 1 M HCl solutions to imitate the corrosive environment. The as-prepared MI extract analyzed by UV-Vis Spectrophotometer shows a shoulder peak at about 370 nm, resulting from the π → π* and n → π* electronic transition of aromatic C=C and carbonyl (C=O) functional groups. A Fourier transform infrared spectroscopy (FTIR) found that the MI extract exhibits aromatic C=C, C=O groups of phenolic compounds, C-OH, and C-O stretching vibrations. The electrochemical impedance spectroscopy (EIS) and Tafel plot analysis evaluate that the optimum corrosion inhibition of copper was achieved at 0.6 mg/ml concentration. The result is supported by a positive shift in the corrosion potential, Ecorr, lower corrosion current, Icorr and corrosion rate (CR) at -0.233 V, 4.39 µA/cm2 and 0.05 mm/yr, respectively. The surface morphology of the copper substrate after the corrosion test evaluated using metallurgical microscopy shows tremendous corrosion inhibition due to the adsorption of the molecules from the MI extracts.