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<p>The adverse effects of synthetic corrosion inhibitors have increased the need to explore sustainable, eco-friendly, and green corrosion inhibitors usually derived from plant-based materials. However, very limited work on <i>Acalypha wilkesiana</i> leaf extract has been explored as corrosion inhibitor. The present study investigate the potential of <i>Acalypha wilkesiana</i> (AW) leaf extract for aluminum in 1&#xa0;N HCl media. The extract was prepared using the Soxhlet solvent extraction technique. The corrosion inhibition performance of the extract was investigated using the weight loss method, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), and cyclic voltammetry (CV). The gravimetric analysis demonstrates that as the concentration increases, the corrosion inhibition potential of AW leaf extract increases. The highest inhibition efficiency of 96.55% was observed at a concentration of 900 ppm after 18&#xa0;h of immersion, corresponding to a minimum corrosion rate of 0.282&#xa0;g.cm<sup>− 2</sup>.h<sup>− 1</sup>. EIS results show a depressed semi-circle, indicating that charge transfer resistance is primarily responsible for inhibition, and a maximum efficiency of 94.70%. The PDP studies indicate that the inhibitor derived from AW leaf extract mainly functions as a cathodic inhibitor. CV results support the findings of PDP, which shows 87.07% maximum inhibition efficiency at 900 ppm after 18&#xa0;h. Surface characterization and functional group analysis were conducted through scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) spectroscopy, respectively. The FT-IR peaks indicate the presence of –OH, -C = N, -C = O, and aromatic unsaturation, suggesting the extract’s potential to interact with the metal surface. Scanning electron microscopy (SEM) images confirm that the inhibitor protects the aluminum metal from HCl media by forming a thin protective layer and obeying the Langmuir adsorption isotherm with R<sup>2</sup> = 0.998.</p> Graphical Abstract <p></p>

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Experimental and Electrochemical Investigation of Acalypha wilkesiana Leaf as a Sustainable, Green Corrosion Inhibitor for Aluminum in 1 N HCl

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Nafisa Hussain,
  • Manoj Acharya

摘要

The adverse effects of synthetic corrosion inhibitors have increased the need to explore sustainable, eco-friendly, and green corrosion inhibitors usually derived from plant-based materials. However, very limited work on Acalypha wilkesiana leaf extract has been explored as corrosion inhibitor. The present study investigate the potential of Acalypha wilkesiana (AW) leaf extract for aluminum in 1 N HCl media. The extract was prepared using the Soxhlet solvent extraction technique. The corrosion inhibition performance of the extract was investigated using the weight loss method, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), and cyclic voltammetry (CV). The gravimetric analysis demonstrates that as the concentration increases, the corrosion inhibition potential of AW leaf extract increases. The highest inhibition efficiency of 96.55% was observed at a concentration of 900 ppm after 18 h of immersion, corresponding to a minimum corrosion rate of 0.282 g.cm− 2.h− 1. EIS results show a depressed semi-circle, indicating that charge transfer resistance is primarily responsible for inhibition, and a maximum efficiency of 94.70%. The PDP studies indicate that the inhibitor derived from AW leaf extract mainly functions as a cathodic inhibitor. CV results support the findings of PDP, which shows 87.07% maximum inhibition efficiency at 900 ppm after 18 h. Surface characterization and functional group analysis were conducted through scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) spectroscopy, respectively. The FT-IR peaks indicate the presence of –OH, -C = N, -C = O, and aromatic unsaturation, suggesting the extract’s potential to interact with the metal surface. Scanning electron microscopy (SEM) images confirm that the inhibitor protects the aluminum metal from HCl media by forming a thin protective layer and obeying the Langmuir adsorption isotherm with R2 = 0.998.

Graphical Abstract