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<p>This study examined the corrosion inhibition of mild steel (MS) in acidic media using <i>Amaranthus tortuosus</i> Hornem (ATH) as an inhibitor. The investigation employed weight loss experiments, contact angle measurements, surface analysis, and electrochemical techniques. The results demonstrated that in the absence of the inhibitor, MS experienced rapid degradation in acidic conditions, evidenced by significant weight loss and a high corrosion rate. However, the addition of ATH, particularly at a higher concentration of 800&#xa0;ppm, effectively reduced corrosion, achieving an impressive inhibition efficiency of 94.84% within 6&#xa0;h. Electrochemical polarization studies indicated a shift in corrosion potential toward the noble direction, signifying a decreased corrosion tendency. Adsorption studies revealed the formation of a protective layer on the MS surface through monolayer and potential multilayer adsorption mechanisms. Contact angle measurements showed increased surface hydrophobicity, further supporting the development of a protective barrier. UV analysis confirmed the presence of this protective layer, which played a key role in mitigating corrosion. SEM analysis provided visual evidence of reduced surface damage, with fewer pits and preserved structural integrity, underscoring the effectiveness of ATH as a corrosion inhibitor.</p>

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Amaranthus tortuosus Hornem as Eco-Friendly Corrosion Inhibitor for Mild Steel in Acidic Media: Surface Morphology and Electrochemical Study

  • 期刊论文

  • 发表日期：

    2025年6月4日

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  • Deepti Thakur,
  • Navneet Kaur,
  • Manvinder Kaur,
  • Meenakshi Verma,
  • Fohad Mabood Husain,
  • Harvinder Singh Sohal

摘要

This study examined the corrosion inhibition of mild steel (MS) in acidic media using Amaranthus tortuosus Hornem (ATH) as an inhibitor. The investigation employed weight loss experiments, contact angle measurements, surface analysis, and electrochemical techniques. The results demonstrated that in the absence of the inhibitor, MS experienced rapid degradation in acidic conditions, evidenced by significant weight loss and a high corrosion rate. However, the addition of ATH, particularly at a higher concentration of 800 ppm, effectively reduced corrosion, achieving an impressive inhibition efficiency of 94.84% within 6 h. Electrochemical polarization studies indicated a shift in corrosion potential toward the noble direction, signifying a decreased corrosion tendency. Adsorption studies revealed the formation of a protective layer on the MS surface through monolayer and potential multilayer adsorption mechanisms. Contact angle measurements showed increased surface hydrophobicity, further supporting the development of a protective barrier. UV analysis confirmed the presence of this protective layer, which played a key role in mitigating corrosion. SEM analysis provided visual evidence of reduced surface damage, with fewer pits and preserved structural integrity, underscoring the effectiveness of ATH as a corrosion inhibitor.