Comprehensive evaluation of
1-(2,5-dihydroxyphenyl) ethanone thiosemicarbazone as a corrosion inhibitor for mild steel in HCl: integrating weight loss measurements and quantum chemical calculations

• A.H.A. Kareem¹, M.T. Mohamed², I.A. Aziz¹, A.H.M. Al-Musawi³, A.M. Mustafa¹, F.F. Sayyid¹, A.A. Alamiery⁴ and A.A.H. Kadhum⁵

¹ Department of Production Engineering and Metallurgical, University of Technology, Baghdad, 10001, Iraq
² Bilad Al Rafidain University College-Diyala, 32008 Diyala, Iraq
³ Baghdad oil Trining institute, Ministry of oil, Baghdad, 10001, Iraq
⁴ Al-Ayen Scientific Research Center, Al-Ayen Iraqi University, AUIQ, An Nasiriyah, P.O. Box: 64004, Thi Qar, Iraq
⁵ Faculty of Medicine, University of Al-Ameed, P.O. Box: 56001, Karbala, Iraq

Abstract: This research article investigates the corrosion inhibitory properties of 1-(2,5-dihydroxyphenyl) ethanone thiosemicarbazone (DETSC) on mild steel in HCl. Experimental results reveal that a 0.5 mM concentration of DETSC exhibits an impressive inhibition efficiency of 94.2% at 303 K. The adsorption of DETSC molecules onto the mild steel surface adheres to the Langmuir model, resulting in a robust and dense protective film. The effect of concentration on inhibition efficiency was examined across various DETSC concentrations (0.1, 0.2, 0.3, 0.4, 0.5, and 1 mM) at 303 K and different immersion periods (1, 5, 10, 24, and 48 hours). Findings indicate that inhibition efficiency increases with concentration, though there is a slight decrease after 24 hours of immersion. Temperature-dependent corrosion inhibition was also studied at 303, 313, 323, and 333 K, using an optimum immersion time of five hours and varying inhibitor concentrations. Results demonstrate that an increase in temperature leads to a decrease in inhibition efficiency. The experimental approach was complemented with theoretical calculations based on Density Functional Theory (DFT) to gain a comprehensive understanding of the anticorrosive performance and inhibition mechanism. The integrated approach provides precise insights into the corrosion inhibiting efficiency of DETSC under varying physical and chemical conditions of the mild steel surface. These findings offer novel strategies for developing and enhancing practical corrosion inhibitors.

Keywords: mild steel, DFT, corrosion inhibitor, mechanism, thiosemicarbazone

Int. J. Corros. Scale Inhib., 2025, 14, no. 1, 1-18
doi: 10.17675/2305-6894-2025-14-1-1

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