Aluminium Corrosion Inhibition by Maesobatrya barteri Root Extract in Hydrochloric Acid Solution
O. U. Abakedi *
Department of Chemistry, University of Uyo, P.M.B. 1017, Uyo, Nigeria
I. E. Moses
Department of Chemistry, University of Uyo, P.M.B. 1017, Uyo, Nigeria
*Author to whom correspondence should be addressed.
Abstract
Maesobatrya barteri root extract inhibited the corrosion of aluminium in hydrochloric acid solutions by both gravimetric and thermometric methods. The inhibition efficiency increased with increase in root extract concentration but decreased with increase in temperature. The adsorption of the root extract on aluminium surface obeyed the Langmuir adsorption isotherm. The calculated thermodynamic parameters revealed that the corrosion inhibition process was both endothermic and spontaneous. Physical adsorption has been proposed for the adsorption of Maesobatrya barteri root extract on aluminium surface.
Keywords: Corrosion inhibition, Langmuir isotherm, aluminium, Maesobatrya barteri; physisorption