The Consistent Effect of Citrus aurantium Fruit Peels Extract as New Type Green Inhibitor on Mild Steel Corrosion in HCl Solution

Abstract

The role of Citrus aurantium fruit peel extract solution in the existing research is to investigate the effect as corrosion inhibitor on mild steel in the atmospheric environment with its eco-friendly and green effect. It was studied the inhibitor effect of Citrus aurantium utilizing linear polarization (LPR), potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) methods. The working electrodes were immersed in HCl solutions containing various concentrations of Citrus aurantium fruit peels extract in order to equilibrate the metal-solution interface for one hour before each measurement. The bitter orange fruit peels extract indicated a potent inhibitor influence as a consequence of one hour electrochemical tests, and with the raise of extract concentrations of Citrus aurantium fruit peels, the protection influence of mild steel electrodes in HCl solutions also enhanced. Finally, the surface morphologies of the working electrodes in aggressive HCl solutions without and with bitter orange fruit peels extract after one-hour immersion were analysed by an optical microscopy, it was concluded that the mild steel surface in the Citrus aurantium fruit peels extract solution had a flawless surface compared to the blank one. Experimental data and surface morphology results are highly consistent with each other.