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Corrosion of steel reinforcement in concrete, particularly under chloride exposure, continues to pose a serious durability challenge in the construction industry. Among various corrosion mitigation techniques, the use of chemical corrosion inhibitors (CCIs), particularly the alko-amine-based, is emerging as an effective, user-friendly alternative due to their ease of application and formulation flexibility. This study explores the role of the molecular structure of alko-amine in influencing corrosion inhibition performance, with a focus on film formation capability and durability when used as an admixture in reinforced mortar systems. Four alko-amine formulations, monoethanolamine (MEA), methyl ethanolamine (MeEA), dimethyl ethanolamine (DMeEA), and ethyl monoethanolamine (EMEA), were initially screened using industrial-level vapour-phase inhibition testing (JIS Z 1535), laboratory-level electrochemical assessment, and surface analytical technique (atomic force microscopy (AFM)). Among the tested CCIs, MEA and MeEA demonstrated superior film-forming ability, producing dense and uniform layers, while DMeEA and EMEA exhibited a weaker performance. The top-performing alko-amine CCI, MeEA, was then compared against an inorganic calcium nitrite (CN) inhibitor and a commercially available organic inhibitor (containing DMeEA) using reinforced mortar testing. The comparative study assessed the corrosion resistance ability of admixed CCI by monitoring rebar performance under chloride-contaminated conditions. MeEA added sample showed a higher inhibition efficiency (IE) and superior film characteristics of reinforcement at prolonged exposure age, compared to both commercial and inorganic counterparts. This integrated investigation underscores the importance of molecular formulation in the development of efficient CCIs. By combining formulation-level insights with practical mortar-based validation, the study presents a targeted approach for understanding CCI effectiveness to enhance the service life of RC exposed to chloride environments.

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Role of Alko-Amine Corrosion Inhibitor Formulation in Enhancing Durability of Reinforced Concrete Subjected to Chloride-Rich Exposure

  • 会议论文

  • 发表日期：

    2026年

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  • Harshit Agrawal,
  • Amol A. Patil,
  • Salman Muhammad

摘要

Corrosion of steel reinforcement in concrete, particularly under chloride exposure, continues to pose a serious durability challenge in the construction industry. Among various corrosion mitigation techniques, the use of chemical corrosion inhibitors (CCIs), particularly the alko-amine-based, is emerging as an effective, user-friendly alternative due to their ease of application and formulation flexibility. This study explores the role of the molecular structure of alko-amine in influencing corrosion inhibition performance, with a focus on film formation capability and durability when used as an admixture in reinforced mortar systems. Four alko-amine formulations, monoethanolamine (MEA), methyl ethanolamine (MeEA), dimethyl ethanolamine (DMeEA), and ethyl monoethanolamine (EMEA), were initially screened using industrial-level vapour-phase inhibition testing (JIS Z 1535), laboratory-level electrochemical assessment, and surface analytical technique (atomic force microscopy (AFM)). Among the tested CCIs, MEA and MeEA demonstrated superior film-forming ability, producing dense and uniform layers, while DMeEA and EMEA exhibited a weaker performance. The top-performing alko-amine CCI, MeEA, was then compared against an inorganic calcium nitrite (CN) inhibitor and a commercially available organic inhibitor (containing DMeEA) using reinforced mortar testing. The comparative study assessed the corrosion resistance ability of admixed CCI by monitoring rebar performance under chloride-contaminated conditions. MeEA added sample showed a higher inhibition efficiency (IE) and superior film characteristics of reinforcement at prolonged exposure age, compared to both commercial and inorganic counterparts. This integrated investigation underscores the importance of molecular formulation in the development of efficient CCIs. By combining formulation-level insights with practical mortar-based validation, the study presents a targeted approach for understanding CCI effectiveness to enhance the service life of RC exposed to chloride environments.