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<p>The corrosion behavior of St3 steel in weakly alkaline, chloride-containing solutions was investigated using potentiodynamic polarization, electrochemical impedance spectroscopy, scanning electron microscopy, and energy-dispersive X‑ray microanalysis. These environments were inhibited by starch biopolymer and a&#xa0;composition based on it. The optimal content of starch + sodium glutamate composition components (total content of 2 g/L) was established. An 18-fold increase in the charge transfer resistance was observed in the composition-inhibited weakly alkaline solution compared with the non-inhibited system after prolonged exposure (120 h), while a&#xa0;10-fold increase was recorded in the chloride-containing weakly alkaline environment. The high inhibitory efficiency (more than 90%) of the created composition for the carbon steel protection in a&#xa0;weakly alkaline chloride-containing corrosive environment, which simulates a&#xa0;pore solution in concrete, was established. The protective mechanism of the starch + sodium glutamate composition consists not only in the adsorption binding of starch molecules through electron-rich hydroxyl groups and the formation of surface complexes with iron, but also in the compaction of the surface protective film by ionized glutamates. The developed composition is made of renewable organic plant raw materials and effectively protects steel structures and products against corrosion, not only in slightly alkaline environments, but also in chloride-containing slightly alkaline compositions caused by concrete aging.</p>

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Eco-friendly starch-based inhibitory composition for corrosion protection of reinforced concrete structures in weakly alkaline environments

  • 期刊论文

  • 发表日期：

    2026年7月23日

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  • M. B. Tymus,
  • I. M. Zin,
  • S. A. Korniy,
  • V. I. Fedoriv

摘要

The corrosion behavior of St3 steel in weakly alkaline, chloride-containing solutions was investigated using potentiodynamic polarization, electrochemical impedance spectroscopy, scanning electron microscopy, and energy-dispersive X‑ray microanalysis. These environments were inhibited by starch biopolymer and a composition based on it. The optimal content of starch + sodium glutamate composition components (total content of 2 g/L) was established. An 18-fold increase in the charge transfer resistance was observed in the composition-inhibited weakly alkaline solution compared with the non-inhibited system after prolonged exposure (120 h), while a 10-fold increase was recorded in the chloride-containing weakly alkaline environment. The high inhibitory efficiency (more than 90%) of the created composition for the carbon steel protection in a weakly alkaline chloride-containing corrosive environment, which simulates a pore solution in concrete, was established. The protective mechanism of the starch + sodium glutamate composition consists not only in the adsorption binding of starch molecules through electron-rich hydroxyl groups and the formation of surface complexes with iron, but also in the compaction of the surface protective film by ionized glutamates. The developed composition is made of renewable organic plant raw materials and effectively protects steel structures and products against corrosion, not only in slightly alkaline environments, but also in chloride-containing slightly alkaline compositions caused by concrete aging.