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Abstract <p>This study deals with the corrosion inhibition nature of a terpolymer of methyl methacrylate (MMA), vinyl benzoyl chloride (VBC), and <i>N</i>-2-methyl-4-nitrophenyl maleimide (MI) on carbon steel in a 1 M HCl solution. The genesis of the study is based on organic terpolymers used as corrosion inhibitors reiterating the synergistic effects on corrosion inhibition contributed by different monomers and their adsorption behaviors on the metal surface. The polymer termed P(MMA–VBC–MI) was synthesized via solution radical polymerization in varying molar ratios of MMA/VBC of 60 : 10, 50 : 20, 40 : 30, with MI being constant at 30%. Some of the characterization methods used were FTIR for terpolymer structure elucidation, thermal analyses (TGA, DTG, and DSC) for thermal stability studies, and electrochemical experiments, such as potentiodynamic polarization and EIS, for inhibition studies. The primary results showed that the terpolymer with 30% VBC content had greater thermal stability and corrosion resistance compared to pure polymethyl methacrylate (PMMA) because of the decrease in the mobility of polymer chains, in addition to the formation of a passive protective layer on the steel surface. EIS and polarization results indicated that terpolymer Ter3 with an MMA/VBC ratio of 40 : 30 exhibited the highest inhibition efficiency, and the adsorption behavior of this terpolymer followed the Langmuir isotherm model (adsorption free energy between –34.48 and –39.35&#xa0;kJ/mol), suggesting physical along with chemical adsorption phenomena. These findings underscore the significance of organic terpolymers as biocompatible and nontoxic alternatives to conventional inhibitors like chromates, providing environmentally friendly alternatives for corrosion protection of carbon steel in acidic media. The findings of this study can result in the creation of new inhibitor materials for industrial applications, particularly in oil and gas industries, and in furthering the understanding of corrosion inhibition mechanisms.</p>

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Electrochemical Study of MMA–VBC–MI Terpolymers as Corrosion Inhibitors in 1 M Acidic Environments

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • Shahrzad Jahangiri,
  • Ladan Gramifar,
  • Kamran Jahangiri

摘要

Abstract

This study deals with the corrosion inhibition nature of a terpolymer of methyl methacrylate (MMA), vinyl benzoyl chloride (VBC), and N-2-methyl-4-nitrophenyl maleimide (MI) on carbon steel in a 1 M HCl solution. The genesis of the study is based on organic terpolymers used as corrosion inhibitors reiterating the synergistic effects on corrosion inhibition contributed by different monomers and their adsorption behaviors on the metal surface. The polymer termed P(MMA–VBC–MI) was synthesized via solution radical polymerization in varying molar ratios of MMA/VBC of 60 : 10, 50 : 20, 40 : 30, with MI being constant at 30%. Some of the characterization methods used were FTIR for terpolymer structure elucidation, thermal analyses (TGA, DTG, and DSC) for thermal stability studies, and electrochemical experiments, such as potentiodynamic polarization and EIS, for inhibition studies. The primary results showed that the terpolymer with 30% VBC content had greater thermal stability and corrosion resistance compared to pure polymethyl methacrylate (PMMA) because of the decrease in the mobility of polymer chains, in addition to the formation of a passive protective layer on the steel surface. EIS and polarization results indicated that terpolymer Ter3 with an MMA/VBC ratio of 40 : 30 exhibited the highest inhibition efficiency, and the adsorption behavior of this terpolymer followed the Langmuir isotherm model (adsorption free energy between –34.48 and –39.35 kJ/mol), suggesting physical along with chemical adsorption phenomena. These findings underscore the significance of organic terpolymers as biocompatible and nontoxic alternatives to conventional inhibitors like chromates, providing environmentally friendly alternatives for corrosion protection of carbon steel in acidic media. The findings of this study can result in the creation of new inhibitor materials for industrial applications, particularly in oil and gas industries, and in furthering the understanding of corrosion inhibition mechanisms.