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<p>Plant-derived tannin extracts are promising environmentally friendly alternatives to conventional anticorrosion agents and rust converters. However, the influence of solvent polarity on the composition and functional performance of tannin extracts remains insufficiently studied. This study aimed to evaluate the effect of solvent type (Water–Ethanol mixtures) on the component composition, antioxidant activity, and anticorrosion performance of Mimosa tannin extract (MTE), and to develop a sustainable rust converter based on the optimized extract. MTE was characterized using FTIR, ¹H NMR spectroscopy, SEM, and XRD analysis. Antioxidant activity was assessed by spectrophotometry and cyclic voltammetry. Anticorrosion properties were evaluated through electrochemical measurements. The environmental sustainability of the developed rust converter was analyzed using the AGREEprep tool. MTE contained 74.5% water-soluble compounds, 16.5% insoluble fractions, and 35.5% condensed tannins. Solvent polarity significantly influenced the component profile of the extracts. The Water/Ethanol (20/80, v/v) mixture provided the optimal extraction conditions, resulting in the highest rust conversion efficiency and corrosion inhibition performance. Electrochemical studies confirmed enhanced protective behavior of the optimized formulation. The anticorrosion mechanism involves dual action: (I) chelation of tannin polyphenolic groups with metal ions and (ii) oxidative polymerization of tannins on the steel surface, leading to the formation of a stable organic–inorganic protective barrier that suppresses further oxidation. The results demonstrate that solvent composition critically affects the functional properties of Mimosa tannin extract. The optimized Water/Ethanol (20/80) system enables the development of an efficient and environmentally sustainable rust converter based on natural polyphenols.</p> Graphical abstract <p></p>

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The Roles of the Solvent When Using Extract of Biomass “Mimosa” in the Composition of Environmentally Friendly Rust Converters

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • Victoria Vorobyova,
  • Margarita Skiba,
  • Oleksiy Sikorsky,
  • Mykola Borysenko,
  • Tetyana Motronyuk,
  • Svitlana Frolenkova

摘要

Plant-derived tannin extracts are promising environmentally friendly alternatives to conventional anticorrosion agents and rust converters. However, the influence of solvent polarity on the composition and functional performance of tannin extracts remains insufficiently studied. This study aimed to evaluate the effect of solvent type (Water–Ethanol mixtures) on the component composition, antioxidant activity, and anticorrosion performance of Mimosa tannin extract (MTE), and to develop a sustainable rust converter based on the optimized extract. MTE was characterized using FTIR, ¹H NMR spectroscopy, SEM, and XRD analysis. Antioxidant activity was assessed by spectrophotometry and cyclic voltammetry. Anticorrosion properties were evaluated through electrochemical measurements. The environmental sustainability of the developed rust converter was analyzed using the AGREEprep tool. MTE contained 74.5% water-soluble compounds, 16.5% insoluble fractions, and 35.5% condensed tannins. Solvent polarity significantly influenced the component profile of the extracts. The Water/Ethanol (20/80, v/v) mixture provided the optimal extraction conditions, resulting in the highest rust conversion efficiency and corrosion inhibition performance. Electrochemical studies confirmed enhanced protective behavior of the optimized formulation. The anticorrosion mechanism involves dual action: (I) chelation of tannin polyphenolic groups with metal ions and (ii) oxidative polymerization of tannins on the steel surface, leading to the formation of a stable organic–inorganic protective barrier that suppresses further oxidation. The results demonstrate that solvent composition critically affects the functional properties of Mimosa tannin extract. The optimized Water/Ethanol (20/80) system enables the development of an efficient and environmentally sustainable rust converter based on natural polyphenols.

Graphical abstract