A descriptive study for corrosion control of low-alloy steel by Aloe vera extract in acidic medium

Abstract

AbstractMethanol extract of Aloe vera leaves (AE) as a green inhibitor for controlling corrosion of low-alloy steel (mild steel) in 0.5 m HCl solution was studied using gravimetric analysis, potentiostatic polarization measurements, electrochemical impedance spectroscopy and quantum analysis. The results obtained revealed that AE has fairly good inhibiting properties against corrosion of mild steel in 0.5 m HCl solution, with efficiency >97%. Also, the inhibition was mixed type that follows the Langmuir adsorption isotherm. The value of ΔG reveals that AE inhibits the corrosion rate via physical type adsorption on the mild steel surface which is further supported by Dubinin-Radushkevich isotherm.