Microwave-assisted extraction of Swietenia macrophylla fruit shell and its application in corrosion inhibition for mild steel in 0.5 M HCl pickling environment

摘要

The present study focuses on the corrosion inhibition property of Swietenia macrophylla fruit shell extract on mild steel (MS) in 0.5 M HCl solution with the help of weight loss (WL), electrochemical (potentiodynamic polarization and AC impedance spectroscopy) and scanning electron microscopy (SEM) techniques. Weight loss results suggest that, the protection efficiency enhances with a rise in the amount of Swietenia macrophylla fruit shell extract and decreases with an increase in the corrosive solution temperature. Tafel plots signify that, mixed corrosion inhibition property of green extract (Swietenia macrophylla fruit shell extract) over the MS surface in 0.5 M HCl solution system. According to impedance spectroscopy results, the charge transfer plays vital role in the prevention of the dissolution process. Theoretical study by quantum chemical method signifies the electron donation property of chemical component of Swietenia macrophylla fruit shell extract. SEM results fully support the chemical (weight loss) and electrochemical (Tafel plot and AC impedance spectroscopy) results.