Understanding the impact of inhibitor concentration, immersion periods, and temperature on the corrosion inhibition of 2-piperazin-1-yl-1,3-benzothiazole in HCl solution

• B.S. Mahdi¹, H.M. Habeeb², I.A.A. Aziz¹, M.M. Hanoon¹, F.F. Sayyid¹, A.M. Mustafa¹, T.S. Gaaz³, A.H. Jaaz⁴, A.A. Khadom⁵, E. Yousif⁶ and A. Alamiery^7,8

¹ Production and Metallurgy Engineering Department, University of Technology-Iraq, P.O. Box: 10001, Baghdad, Iraq
² College of Engineering, Department of Materials Engineering, University of Kufa, P.O. Box: 54002, Kufa, Najaf , Iraq
³ Air Conditioning and Refrigeration Techniques Engineering Department, College of Engineering and Technologies, Al-Mustaqbal University, Babylon 51001 Iraq
⁴ Medical Physics Department, College of Science, Al-Mustaqbal University, Babylon 51001 Iraq
⁵ Department of Chemical Engineering, College of Engineering, University of Diyala, Diyala 32008, Iraq
⁶ Department of Chemistry, College of Science, Al-Nahrain University, Baghdad 10001, Iraq
⁷ Energy and Renewable Energies Technology Center, University of Technology, Iraq, P.O. Box: 10001, Baghdad, Iraq
⁸ Department of Chemical and Process Engineering, Faculty of Engineering and Build Environment, Universiti Kebangsaan Malaysia, P.O. Box: 43600, Bangi, Selangor, Malaysia

Abstract: The corrosion inhibition potential of 2-piperazin-1-yl-1,3-benzothiazole (PYB) for mild steel in 1.0 M hydrochloric acid (HCl) was comprehensively investigated through weight loss measurements and quantum chemical calculations. The study delved into the influence of various corrosion inhibition parameters, including PYB concentration, immersion times, and temperature. Remarkably, the highest inhibition efficiency of PYB reached 90.7% at a concentration of 0.5 mM and a temperature of 303 K. Notably, inhibition efficiency demonstrated an upward trend with increasing concentration. Weight loss techniques affirmed that inhibition efficiency correspondingly increased with prolonged immersion times, as well as with elevated temperature. Furthermore, the observed higher inhibition performance with increasing temperature was corroborated by the calculated ΔG° values, suggesting that PYB actively participates in both physical and chemical adsorption processes on the mild steel surface. The adsorption phenomenon adhered to the Langmuir adsorption isotherm, as supported by experimental and theoretical findings, which exhibited commendable agreement. This study presents a comprehensive understanding of the corrosion inhibition mechanism of PYB, offering valuable insights for future applications in corrosion mitigation strategies.

Keywords: corrosion inhibition, 2-piperazin-1-yl-1,3-benzothiazole (PYB), HCl, immersion time, temperature

Int. J. Corros. Scale Inhib., 2024, 13, no. 2, 1164-1185
doi: 10.17675/2305-6894-2024-13-2-28

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