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

• D.S. Zinad¹, Q.A. Jawad², M.A.M. Hussain³, A. Mahal^4,5, L. Mohamed⁶ and A.A. Al-Amiery⁶

¹ Applied Science Department, University of Technology, Baghdad 10001, Iraq
² Electrical Department, University of Technology, Baghdad 10001, Iraq
³ Al Rafidain University College, Department of Air-Conditioning and Refrigeration Engineering Technology, Baghdad, Iraq
⁴ Key Laboratory of Plant Resources Conservation and Sustainable Utilization and Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, People’s Republic of China
⁵ Guangzhou HC Pharmaceutical Co., Ltd, Guangzhou 510663, People’s Republic of China
⁶ Energy and Renewable Energies Technology Center, University of Technology, Baghdad 10001, Iraq

Abstract: 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

Int. J. Corros. Scale Inhib., 2020, 9, no. 1, 134-151 PDF (1 187 K)
doi: 10.17675/2305-6894-2020-9-1-8

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