POTENCY OF AFRICAN BLACK VELVET TAMARIND AS INHIBITOR OF ALUMINIUM DISSOLUTION IN HYDROCHLORIC ACID.

Abosede James; Eziaku Osarolube

Volume : V, Issue : X, October - 2015

POTENCY OF AFRICAN BLACK VELVET TAMARIND AS INHIBITOR OF ALUMINIUM DISSOLUTION IN HYDROCHLORIC ACID.

Abosede James, Eziaku Osarolube

Abstract :

The potency of African Black Velvet Tamarind (VT) as an environmentally safe inhibitor for aluminium (Al) dissolution in 0.5M hydrochloric acid (HCl) solution was evaluated with weight loss method of corrosion measurement. The examination was carried out under three different conditions; 30, 40 and 50oC. VT inhibited the corrosion of aluminium significantly, with 96% efficiency at the highest concentration (0.25g/500ml) and temperature (50oC) of the inhibitor. Percentage efficiency of the inhibitor increased with temperature and concentration. The thermodynamic parameters for the inhibition process were calculated and a chemical adsorption mechanism was proposed. The potency of VT in reducing aluminium dissolution was attributed to the adsorption and surface chelation of some electron rich chemical compounds in VT on the metal surface. This adsorption behavior of VT fits perfectly with the Langmuir adsorption isotherm at all the temperatures studied.