Insight into the use of 1,3,5,7-tetrahexyl-1,3,5,7-tetraazaadamantane-1,3,5,7-tetraium bromide as a highly efficient inhibitor for the corrosion of C1018 low-carbon steel in acidic medium: Synthesis, characterization, and electrochemical studies

• Z.K. Kuraimid¹, D.S. Abid² and A.A.S. Fouda¹

¹ Department of Chemistry, Faculty of Science, Mansoura University, Mansoura, 35516, Egypt
² College of Education for Pure Science, Basra University, Basra, Iraq

Abstract: 1,3,5,7-Tetrahexyl-1,3,5,7-tetraazaadamantane-1,3,5,7-tetraium bromide (TTB) was synthesized and identified by spectral methods such as: FTIR; ¹H and ¹³C NMR. Using the weight loss (WL) and polarization techniques (PDP), it was determined that TTB has an inhibitory effect on the corrosion of C1018 steel in 6 M HCl solution that reaches a maximum of 97.5% at 200 ppm, 303 K. Electrochemical measurements were used to study the effect of temperature (40–70°C) in 6 M HCl with and without various concentrations of TTB and to explain the process mechanism. As the concentration is increased, the inhibition efficiency (%IE) rises. Nevertheless, it declined as the temperature increased, reaching 76.5% at the same concentration and 343 K. The adsorption of TTB was found to obey the Langmuir adsorption isotherm. Since the ΔG⁰_ads values were found to be between –19.74 and –25.4 kJ·mol^–1, the analyzed isotherm plots demonstrated that the adsorption process for TTB on the metal surface is a mixed one (physical and chemical). Polarization data showed that TTB functions as a mixed type inhibitor (affects both metal dissolution and hydrogen evolution). The morphology of C1018 steel was examined by scanning electron microscopy (SEM). Overall, the combined experimental study provides a deeper understanding of the corrosion inhibition mechanism of TTB on C1018 steel in 6 M HCl solution. The results of all the tests methods agree with each other.

Int. J. Corros. Scale Inhib., 2023, 12, no. 3, 1162-1179
doi: 10.17675/2305-6894-2023-12-3-20

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