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This study explores the use of leaf extracts as a sustainable coating material to enhance the mechanical and corrosion resistance properties of steel bars in reinforced cement concrete. Organic pigments were synthesized by combining zinc phosphate and silica fume with leaf extracts from Hibiscus rosa-sinensis (H) and Azadirachta indica (A), which were incorporated into an epoxy coating on the steel bars. Tafel polarization measurements were used to examine the corrosion behavior of reinforced concrete specimens in an accelerated corrosion environment containing 3.5% NaCl and 1 M sulfuric acid solutions. Results indicated that the phosphorus content in the extracts significantly reduced corrosion potential and enhanced coating efficiency. Moreover, the A-coated specimens exhibited superior performance, with no coating failure.

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Optimized Corrosion Resistance in Reinforced Concrete Using Eco-Friendly Coatings Derived from Hibiscus Rosa-Sinensis and Azadirachta Indica

  • 会议论文

  • 发表日期：

    2026年

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  • M. Ananthkumar,
  • K. M. Mini,
  • Aswathi Viswam,
  • Ganapathy Kumaresh

摘要

This study explores the use of leaf extracts as a sustainable coating material to enhance the mechanical and corrosion resistance properties of steel bars in reinforced cement concrete. Organic pigments were synthesized by combining zinc phosphate and silica fume with leaf extracts from Hibiscus rosa-sinensis (H) and Azadirachta indica (A), which were incorporated into an epoxy coating on the steel bars. Tafel polarization measurements were used to examine the corrosion behavior of reinforced concrete specimens in an accelerated corrosion environment containing 3.5% NaCl and 1 M sulfuric acid solutions. Results indicated that the phosphorus content in the extracts significantly reduced corrosion potential and enhanced coating efficiency. Moreover, the A-coated specimens exhibited superior performance, with no coating failure.