Experimental and theoretical studies on the corrosion inhibition potentials of N′-((1H-indole-3-yl)methylene)benzohydrazide for mild steel in HCl

• J.A. Ibrahim¹, H.H. Ibraheem¹ and H.T. Hussein²

¹ University of Technology (UOT), Department of Applied Science, Branch of Applied Chemistry, 8C6W+6P2, Al Senaha St, Baghdad, Baghdad Governorate, Iraq
² University of Technology (UOT), Department of Applied Science, Physics Division, 8C6W+6P2, Al Senaha St, Baghdad, Baghdad Governorate, Iraq

Abstract: In this study, we introduce a novel corrosion inhibitor, N′-((1H-indole-3-yl)methylene)-benzo¬hydrazide (IMBH) synthesized from indole-3-carboxyaldehyde. The inhibitory properties of IMBH and the starting material were investigated for mild steel in hydrochloric acid (HCl) solutions of varying concentrations (0.2 M, 0.4 M, and 0.6 M). The evaluation of corrosion inhibition was performed using a combination of scanning electron microscopy (SEM), energy dispersion X-ray analysis (EDX) techniques, and electrochemical measurements. Our findings demonstrate a clear correlation between the concentration of the inhibitor and its inhibition effectiveness. As the concentration of IMBH rises, the corrosion of mild steel is more effectively controlled. The inhibition mechanism mainly operates through a charge transfer process, where the formation of protective adsorption layers on the steel surface plays a significant role in mitigating corrosion. Furthermore, we employed quantum chemical calculations to gain insights into the inhibitory process, offering valuable theoretical support for our experimental observations. This investigation sheds light on the promising corrosion inhibition potential of IMBH and its feasibility as a protective agent for mild steel in acidic environments. The understanding of its inhibitory mechanism, facilitated by quantum chemical analysis, provides essential knowledge for the development of effective corrosion prevention strategies in various industrial applications.

Keywords: scanning electron microscopy, energy dispersion X-ray analysis, charge transfer, protective adsorption layers, quantum chemical calculations

Int. J. Corros. Scale Inhib., 2024, 13, no. 1, 94-120
doi: 10.17675/2305-6894-2024-13-1-6

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