Synthesis of Some Schiff Bases and Investigation of their Corrosion Inhibition Efficiencies for Aluminum in Acidic Media

Abstract

O. Aliyu, F. E. Awe, M. D. Faruruwa and T. E. Abawua

In this study, the effectiveness of some synthesized Schiff bases as corrosion inhibitors was investigated using gravimetric and FTIR methods. The Schiff bases were characterized using Fourier transform infrared spectroscopy (FTIR). The Schiff bases having different ligands ((namely,  ligand (L), copper ligand (CuL), and iron ligand (FL))) were investigated for their efficiencies towards the inhibition of the corrosion of aluminum in HCl (0.1 M) and H₂SO₄ (0.05 M) respectively using gravimetric method.  The results show good inhibition efficiencies that increase with an increase in the concentration of the inhibitor but decrease with a temperature rise and with the period of contact. Langmuir adsorption isotherm best fitted the adsorption characteristics of the inhibitors and the adsorption was spontaneous, endothermic, ordered, and consistent with the mechanism of physical adsorption. The synthesized Schiff bases are therefore considered as useful products for the inhibition of the corrosion of aluminum in HCl and H₂SO₄ media. However, efficiency towards inhibition is better in H₂SO₄ than in HCl due to passivation sustenance.