Crocus Sativus L. Flower Aqueous Extract as Corrosion Inhibitor of Tinplate (Cans Material) in 0.5M H2C2O4 Medium

Abstract

This study aims at finding a new solution against food cans corrosion. The effect of the aqueous extract of Crocus Sativus flower after the recuperation of the stigma against cans material (tinplate) corrosion in 0.5M H2C2O4, was evaluated using the gravimetric, electrochemical and SEM-EDX analysis. The results show that the studied extract reduces the corrosion effect proportionally to the concentration used to reach its highest inhibition efficiency of 87.3% at 3g.L-1 of CS extract; this is undoubtedly linked to the chemical composition of the studied extract. The adsorption of the extracted compounds on the tinplate surface follows the Langmuir isotherm. The extract behavior at a temperature between 303 and 373K shows that the extract exhibits good inhibition over a range of moderate to high temperatures. Analysis of the tinplate surface using scanning electron microscopy and energy dispersive X-rays (SEM-EDX) confirms adsorption of oxygenated molecules and verifies that the surface is significantly improved in the extract's presence compared with that exposed to the acid medium.