Adsorption, temperature and corrosion inhibition studies of a coumarin derivatives corrosion inhibitor for mild steel in acidic medium: gravimetric and theoretical investigations

The corrosion inhibition features of a new eco-friendly coumarin derivative, namely, 4-((4-
((4-hydroxy-3-methoxybenzylidene)amino)-5-thioxo-4,5-dihydro-1H-1,2,4-triazol-3-yl)-
methyl)coumarin (HATC), for corrosion of the mild steel surface in an acidic environment
was studied using gravimetric techniques and quantum chemical calculations. It was
concluded that the tested coumarin derivative is an excellent corrosion inhibitor with high
inhibition efficiency. The inhibition performance increases with increasing concentration of
the investigated coumarin (HATC) and decreases with increasing temperature. The
mechanism of adsorption includes a physical adsorption mechanism. Theoretical studies done
on the new coumarin molecule using the density functional theory (DFT) have shown that the
most likely entities in coumarin molecules to bond to the metal surface are nitrogen, sulfur and
oxygen atoms.
Keywords: corrosion inhibition, HATC, coumarin, quantum chemical calculation,
adsorption.
Received: December 1, 2019. Published: January 31, 2020

Dr.mohammed Ali Mahmood Hussien

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