Batatas lam leaf extract as a biodegradable corrosion inhibitor for copper in 0.5 M H2SO4 solution

Abstract

In this study, the Ipomoea Batatas Lam Leaf Extract (IBLE) was obtained through a pure water decoction process. To investigate the corrosion inhibition capabilities of Ipomoea Batatas Lam Leaf Extract (IBLE), a comprehensive approach encompassing electrochemical techniques, X-ray Photoelectron Spectroscopy (XPS), Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM), and theoretical calculations has been employed. The electrochemical test results demonstrate a remarkable corrosion inhibition efficiency of up to 96.7% when utilizing an 800 mg/L concentration of IBLE. As the temperature increases, IBLE can still maintain a high standard of anti-corrosion performance and the corrosion inhibition performance can even maintain more than 95% at a temperature of 315 K. Polarization curve test results demonstrate that IBLE belongs to the mixed corrosion inhibitor, which restrains both anode and cathode reactions of copper electrodes in 0.5 M H2SO4 medium. The EIS test shows that the effective inhibition of the charge transfer process by the adsorption of IBLE onto the interface of copper, as the concentration of IBLE increases, there is a notable and significant rise in it, thus showing a great corrosion inhibition property. The surface morphology test shows that the erosion of the copper surface is significantly suppressed after IBLE adsorbing on the copper surface. XPS test reveals that the active ingredients in IBLE can generate Cu–N bonds on the copper surface, producing chemisorption. Theoretical calculation results reveal that the active ingredients of IBLE have great corrosion suppression property.