Effect of the structure, immersion time and temperature on the corrosion inhibition of 4-pyrrol-1-yl-N-(2,5-dimethyl-pyrrol-1-yl)benzoylamine in 1.0 M HCl solution

• A.A. Alamiery¹, W.N.R.W. Isahak¹, H.S.S. Aljibori², H.A. Al-Asadi² and A.A.H. Kadhum³

¹ Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia
² College of Engineering, University of Warith Al-Anbiyaa, Karbala, Iraq
³ Al-Ameed University, Karbalaa, Iraq

Abstract: A benzoylamine derivative of new class, namely 4-pyrrol-1-yl-N-(2,5-dimethyl-pyrrol-1-yl)benzoylamine (PDPB), has been successfully synthesized and characterized by spectroscopic techniques (Fourier-transform infrared spectroscopy (FTIR) and Nuclear Magnetic Resonance (NMR)) and CHN analysis. PDPB acts as a new corrosion inhibitor for mild steel in HCl environment. The inhibition efficiency was determined by mass loss measurements and by scanning electron microscopy (SEM). The inhibitive performance of PDPB on mild steel in 1 M hydrochloric acid environment was studied as a function of PDPB concentration, immersion time, and temperature. The inhibition efficiency increases with an increase in inhibitor concentration and decreases with an increase in immersion time and temperature. The PDPB molecules are adsorbed on the surface of mild steel is a mixed mode involving physical adsorption and chemical adsorption. SEM analysis was conducted to investigate the persistency of the layer of PDPB molecules. Moreover, the relationship between the inhibitive performance and the chemical structure of the tested inhibitor molecules was investigated by density functional theory (DFT) calculations. All the experimental findings and theoretical calculations are in good agreement.

Keywords: benzoylamine, PDPB, DFT, corrosion inhibitor

Int. J. Corros. Scale Inhib., 2021, 10, no. 2, 700-713 PDF (676 K)
doi: 10.17675/2305-6894-2021-10-2-14

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