INHIBITION OF MILD STEEL CORROSION IN ACIDICSOLUTION BY DERIVATIVES OF DIPHENYL GLYOXAL

摘要

The effect of diphenyl glyoxal and its dihydrazone derivative on the corrosion of mild steel inhydrochloric acid has been investigated over a wide range of conditions using gravimetric technique.Both compounds were found to function as corrosion inhibitors in the acidic environment, with thedihydrazone derivative exhibiting higher efficiency. Inhibition efficiency generally increased withconcentration of the additive and rise in temperature. Corrosion inhibition is attributed to chemisorptionof inhibitor molecules on the corroding metal surface. These results were further corroborated by kineticand activation parameters for corrosion and adsorption processes evaluated from the experimental data.The differences in the inhibiting properties of the studied compounds are explained in terms ofmodifications in molecular structure.