Inhibiting aluminium acid corrosion using leaves extract of <i>Guiera senegalensis</i>.

Abstract

The effects of Guiera senegalensis leaves extract as a potential green corrosion inhibitor for Aluminum (Al) in HCl acid solution was investigated using weight loss, LPR, FT-IR, and scanning electron microscope techniques at varying experimental conditions. The result indicates that the percentage inhibition efficiency increases with increase in concentration of the inhibitor and decreased with increase in temperature and immersion period. SEM images showed that the Al metal is protected by the inhibitor molecules, while FT-IR spectra indicates the mechanism of physical adsorption of inhibitors onto Al surface. LPR result showed that the inhibition efficiency of the inhibitor was moderate and act as mixed-type inhibitor. The data obtained from the thermodynamic parameters were fitted into various adsorption isotherms, Freundlich adsorption isotherm was observed to be the best fitted isotherm.