Synthesis of poly 1-(4-chlorophenyl)-5-styryl-1-tetrazole by electro polymerization and its corrosion protective properties on low carbon steel surface in 3.5 wt.% NaCl solution

• I.M. Abd and S.A. Habeeb

Department of Chemistry, College of Education for pure science (Ibn Al-Haitham), University of Baghdad, 10071 Baghdad, Iraq

Abstract: In the presented work, the conductive polymer, poly[1-(4-chlorophenyl)-5-styryl-1-tetrazole] (PCPST), was successfully synthesized by the electro polymerization of the 1-(4-chlorophenyl)-5-styryl-1-tetrazole (CPST) monomer. The resulting polymer was characterized using Fourier Transform Infrared spectroscopy (FTIR) and Atomic Force Microscopy (AFM). Additionally, with the use of the potentiostatic method, the corrosion behavior regarding uncoated and coated low carbon steel (L-CS) has been determined with the use of Tafel plots in a corrosion medium of 3.5 wt.% NaCl solution across a temperature range of 293° to 323°K. The protective efficiency of the polymeric coating was remarkably enhanced by incorporating nanoscale metal oxides: magnesium oxide (MgO) and zinc oxide (ZnO). When nano ZnO and nano MgO were present, the polymer’s protection efficiency increased from 75.852% to 80.759% and 91.512%, respectively. Furthermore, kinetic and thermodynamic parameters (the enthalpy of activation ΔH*, the activation energy E_a, the Gibbs free energy ΔG, and the entropy of activation ΔS*) were calculated for both the uncoated and coated L-CS specimens. The AFM was utilized to examine the surface morphology of the coating.

Keywords: electro polymerization, corrosion, coating, carbon steel, nanomaterial

Int. J. Corros. Scale Inhib., 2026, 15, no. 1, 473-491
doi: 10.17675/2305-6894-2026-15-1-24

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