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<p>This study investigated the effectiveness of <i>Colebrookea opposifolia</i> extract (COE) as a natural corrosion inhibitor for stainless steel 410 (SS-410). The inhibition efficiency of COE was evaluated through weight loss analysis and electrochemical measurements, achieving a maximum efficiency of 95.04 percent in 0.5&#xa0;M HCl. Scanning electron microscopy and atomic force microscopy were used to analyze surface topography, revealing that the average surface roughness of clean metal was 26.3&#xa0;nm, whereas acidic and inhibited metals had roughness values of 560&#xa0;nm and 153&#xa0;nm, respectively. The results confirmed that adding COE effectively reduced corrosion at SS-410. Liquid chromatography–mass spectrometry analysis identified major phytochemicals 5,6,7,4′-tetramethoxyflavone, 5,3′-dihydroxy-6,7,4′-trimethoxy flavone (Eupatorine), and Catechin gallate as the major contributors to corrosion protection. Furthermore, Monte Carlo simulations and density functional theory studies provided a theoretical understanding at the atomic and electronic levels, emphasizing the role of heteroatoms as crucial adsorption sites for molecular interactions.</p>

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Colebrookea opposifolia as a Sustainable Green Corrosion Inhibitor for Stainless Steel 410 in 0.5 M HCl: Experimental and Theoretical Aspects

  • 期刊论文

  • 发表日期：

    2025年6月26日

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  • Sushma,
  • Dwarika Prasad,
  • Rajnish Maithani,
  • Avni Berisha,
  • Savaş Kaya

摘要

This study investigated the effectiveness of Colebrookea opposifolia extract (COE) as a natural corrosion inhibitor for stainless steel 410 (SS-410). The inhibition efficiency of COE was evaluated through weight loss analysis and electrochemical measurements, achieving a maximum efficiency of 95.04 percent in 0.5 M HCl. Scanning electron microscopy and atomic force microscopy were used to analyze surface topography, revealing that the average surface roughness of clean metal was 26.3 nm, whereas acidic and inhibited metals had roughness values of 560 nm and 153 nm, respectively. The results confirmed that adding COE effectively reduced corrosion at SS-410. Liquid chromatography–mass spectrometry analysis identified major phytochemicals 5,6,7,4′-tetramethoxyflavone, 5,3′-dihydroxy-6,7,4′-trimethoxy flavone (Eupatorine), and Catechin gallate as the major contributors to corrosion protection. Furthermore, Monte Carlo simulations and density functional theory studies provided a theoretical understanding at the atomic and electronic levels, emphasizing the role of heteroatoms as crucial adsorption sites for molecular interactions.