Electrochemical evaluation of 4-methyl-2-(1-aminoethyl)-1,3-thiazole as a mixed-type corrosion inhibitor for mild steel in 1 M HCl

• R.K. Ahmed¹, N. Betti², M.S.A. Hassan³, R.J. Halbos², A.H. Kadhum⁴ and A. Alamiery^2,3

¹ Department of Petroleum and Gas Refining Engineering, College of Petroleum Processes Engineering, Tikrit University, Saladin, Iraq
² University of Technology, Baghdad, 10001, Baghdad, Iraq
³ Al-Ayen Scientific Research Center, Al-Ayen Iraqi University, AUIQ, An Nasiriyah, P.O. Box: 64004, Thi Qar, Iraq
⁴ Faculty of Medicine, University of Al-Ameed, P.O. Box: 56001, Karbala, Iraq

Abstract: Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) were the techniques used to carry out research on the corrosion inhibition performance of 4-methyl-2-(1-aminoethyl)-1,3-thiazole (MAT) when applied to mild steel (MS) in 1 M hydrochloric acid (HCl) solution. MAT exhibited high corrosion inhibition performance, reaching a maximum inhibition efficiency of 93.48% from EIS measurements and 62.50% from PDP measurements at 0.5 mM concentration. EIS data showed that there was a concentration-dependent increase in charge transfer resistance which meant that there were better barrier properties at higher inhibitor concentrations. Adsorption of MAT on the mild steel surface followed the Langmuir isotherm, leading to the conclusion that the adsorption was monolayer. PDP results showed that MAT acts as a mixed-type corrosion inhibitor because it was able to decrease the anodic metal dissolution and the cathodic hydrogen evolution reactions simultaneously. These findings indicate that MAT is a promising inhibitor for industrial acid cleaning and pickling applications due to its ability to significantly reduce the corrosion rate of mild steel.

Keywords: corrosion inhibition, mild steel, 4-methyl-2-(1-aminoethyl)-1,3-thiazole, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP)

Int. J. Corros. Scale Inhib., 2026, 15, no. 3, 588-607
doi: 10.17675/2305-6894-2026-15-3-28

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