SYNERGISTIC EFFECT OF 1,2-PHENYLENEDIAMINE AND DISODIUM NAPHTHALENE-1,5- SULFONATE FOR ENHANCED CORROSION PROTECTION OF CARBON STEEL IN 0.5 M H₂SO₄ SOLUTION: EXPERIMENTAL AND THEORETICAL INSIGHTS

This work investigates the corrosion inhibition of carbon steel in 0.5 mol·dm⁻³ H₂SO₄ using a binary system of 1,2-phenylenediamine and disodium naphthalene-1,5-sulfonate. Experimental techniques, including weight loss assay, electrochemical methods, and surface analysis, demonstrated significant inhibition efficiency, reaching 88.43% under optimal conditions. The synergistic effect between the t

This work investigates the corrosion inhibition of carbon steel in 0.5 mol·dm⁻³ H₂SO₄ using a binary system of 1,2-phenylenediamine and disodium naphthalene-1,5-sulfonate. Experimental techniques, including weight loss assay, electrochemical methods, and surface analysis, demonstrated significant inhibition efficiency, reaching 88.43% under optimal conditions. The synergistic effect between the two components was evaluated as 2.59, indicating enhanced performance compared to individual components. Computational studies using molecular dynamics and DFT revealed strong interactions, driven by the formation of hydrogen bonding promoted by electrostatic forces during adsorption, which stabilize the protective layer on the metal surface. The adsorption mechanism was consistent with the Langmuir adsorption model, and obtained thermodynamic parameters confirmed spontaneous physisorption of the inhibitor. Electrochemical results identified the binary system as a mixed-type inhibitor, effectively reducing both anodic and cathodic corrosion processes. These findings provide valuable insights into the design of synergistic inhibitor systems for industrial applications.

metal protection, synergistic effect, corrosion inhibitors, inhibition efficiency, molecular dynamics, reactivity descriptors

wo components was evaluated as 2.59, indicating enhanced performance compared to individual components. Computational studies using molecular dynamics and DFT revealed strong interactions, driven by the formation of hydrogen bonding promoted by electrostatic forces during adsorption, which stabilize the protective layer on the metal surface. The adsorption mechanism was consistent with the Langmuir adsorption model, and obtained thermodynamic parameters confirmed spontaneous physisorption of the inhibitor. Electrochemical results identified the binary system as a mixed-type inhibitor, effectively reducing both anodic and cathodic corrosion processes. These findings provide valuable insights into the design of synergistic inhibitor systems for industrial applications.

данной работе исследуется ингибирование коррозии углеродистой стали в среде в 0,5 М растворе H₂SO₄ с использованием бинарной системы 1,2-фенилендиамина и нафталин-1,5-дисульфоната натрия. Экспериментальные методы, включая метод потери массы, электрохимические методы и анализ поверхности, продемонстрировали значительную эффективность ингибирования, достигающую 88,43% при оптимальных условиях. Синергетический эффект между двумя компонентами составил 2,59, что указывает на значительное повышение эффективности по сравнению с отдельными компонентами. Расчётные исследования с использованием методов молекулярной динамики и DFT выявили сильные взаимодействия, обусловленные образованием водородных связей под действием электростатических сил во время адсорбции, которые стабилизируют защитный слой на поверхности металла. Механизм адсорбции соответствовал модели адсорбции Ленгмюра, а полученные термодинамические параметры подтвердили самопроизвольную физическую адсорбцию ингибитора. Результаты электрохимического анализа показали, что бинарная система является ингибитором смешанного типа, эффективно снижающим процессы как анодной, так и катодной коррозии. Эти результаты дают ценную информацию о разработке синергетических систем ингибиторов для промышленного применения.

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