Aquilaria malaccensis as a Green Corrosion Inhibitor for Mild Steel in HCl Solution

摘要

The methanolic extract from the leaf of Aquilaria malaccensis was confirmed to inhibit the corrosion-3 of mild steel in 1 mol dm HCl based on gravimetric and electrochemical methods, and the leaf extractwas found to inhibit corrosion by as much as 94.49 % at the concentration of 1500 ppm. The leafextract acted as a mixed-type, but predominantly cathodic inhibitor for the potentiodynamicpolarization measurement. The adsorption of the leaf extract on the surface of mild steel was by amixed-type, but predominantly physisorption process, fitting the best into the Langmuir adsorptionisotherm model. The surface morphology analysis revealed a less damaged surface when the leafextract was added.