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<p>Ethanol extracts of six plants widely distributed in tropical regions were evaluated in this work. Mild steel and aluminum alloy immersed in 3.5% NaCl solution in the absence and presence of plant extracts were tested using electrochemical techniques—electrochemical impedance spectroscopy and potentiodynamic polarization. The inhibition efficiency of St3 mild steel corrosion was observed in the presence of 0.1 wt% extracts of <i>Wedelia chinensis</i>, <i>Curcuma longa</i>, <i>Camellia sinensis</i>, and <i>Piper betle</i> with corrosion rate reducing 91–95%. For the AMg3 aluminum alloy, extracts of <i>Curcuma longa</i> and <i>Zingiber officinale</i> effectively reduce the rate of corrosion with an inhibition efficiency of 99.9%, increasing the passivity region and preventing the occurrence of pitting corrosion. Field tests of acryl coatings with plant extracts over a 12-month exposition showed that <i>Curcuma longa, Camellia sinensis</i> and <i>Sonneratia alba</i> extracts were the most effective against marine fouling.</p>

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Valorizing the potential of tropical plant extracts for corrosion and biofouling control in neutral chloride media

  • 期刊论文

  • 发表日期：

    2025年8月12日

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  • U. Kharchenko,
  • D. A. Nguyen,
  • V. Egorkin,
  • T. M. H. Le,
  • O. Arefieva,
  • I. Vyaliy,
  • S. Sinebryukhov,
  • S. Gnedenkov

摘要

Ethanol extracts of six plants widely distributed in tropical regions were evaluated in this work. Mild steel and aluminum alloy immersed in 3.5% NaCl solution in the absence and presence of plant extracts were tested using electrochemical techniques—electrochemical impedance spectroscopy and potentiodynamic polarization. The inhibition efficiency of St3 mild steel corrosion was observed in the presence of 0.1 wt% extracts of Wedelia chinensis, Curcuma longa, Camellia sinensis, and Piper betle with corrosion rate reducing 91–95%. For the AMg3 aluminum alloy, extracts of Curcuma longa and Zingiber officinale effectively reduce the rate of corrosion with an inhibition efficiency of 99.9%, increasing the passivity region and preventing the occurrence of pitting corrosion. Field tests of acryl coatings with plant extracts over a 12-month exposition showed that Curcuma longa, Camellia sinensis and Sonneratia alba extracts were the most effective against marine fouling.