European Journal of Biomedical and Pharmaceutical Sciences

FENNEL (FOENICULUM VULGARE MILL) SEEDS EXTRACT AS GREEN INHIBITOR FOR ALUMINIUM CORROSION IN HCl ACID SOLUTION: THERMODYNAMIC, ADSORPTION AND KINETIC STUDY

*Neha I. Prajapati, R. T. Vashi, S. A. Desai

ABSTRACT

The corrosion inhibition of aluminium in HCl solution by Fennel seeds (Foeniculum vulgare Mill) extract as a green inhibitor has been studied using weight loss, temperature effect and kinetic study methods. As inhibitor concentration increases corrosion rate decreases while percentage of inhibition efficiency (I.E.) increases. Corrosion rate increases with the increase in temperature. Mechanism of inhibition was also investigated by calculating the thermodynamic and activation parameters like (ΔG), (Qads), (Ea), (ΔHads) and (ΔSads). Physisorption of extract is best described by the Langmuir adsorption model. Maximum I.E. of Fennel seed extract was found up to 92.01 % at 1.2 g/L inhibitor concentration in 0.75 M HCl solution. Present study indicates that Fennel seeds extract is a good eco-friendly inhibitor for the corrosion of aluminium in HCl medium.

Keywords: Corrosion, Aluminium, HCl, Fennel seeds extract, Weight loss.