Performance Evaluation of Green Walnut Husk Waste Extract for Inhibiting Aluminium 8088 Corrosion in Acidic Solution

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This is an unedited manuscript accepted for publication and provided as an Article in Press for early access at the author’s request. The article will undergo copyediting, typesetting, and galley proof review before final publication. Please be aware that errors may be identified during production that could affect the content. All legal disclaimers of the journal apply.

Year : 2026 | Volume : 17 | 01 | Page :
    By

    Bhagyalakshmi H,

  • Rajeshwari P,

  • Pruthviraj R D,

  1. Assistant Professor, Department of Chemistry, Dr Ambedkar Institute of Technology, Bangalore, Karnataka, India
  2. Associate Professor, Department of IEM, Dr Ambedkar Institute of Technology, Bangalore, Karnataka, India
  3. Associate Professor, Department of Chemistry, Rajarajeswari College of Engineering, Bangalore, Karnataka, India

Abstract

The cumulative call for environmental and supportable corrosion inhibitors has obsessed curiosity in exploiting plant-based agronomic surplus resources. Presented research work discovers the corrosion inhibition probable of green walnut husk extract(GWH)—a normal and plentiful agro-waste—on Aluminium 8088 alloy in an acidic medium. Aluminium 8088, however identified for its corrosion resistance, is vulnerable to squalor in highly acidic settings, affectation trials in several industrial claims. GWH extract act as an ecologically valuable and waste-free (agrarian) inhibitor to increase Aluminium 8088’s corrosion resistance in a 1 M HCl solution. The electrochemical behavior of Aluminum 8088 substrata with and without the inhibitor was investigated using potentiodynamic polarization (PDP) tests, weight change, and electrochemical impedance spectroscopy. The surface morphology of Aluminium 8088 after corrosion, both in the absence and presence of the inhibitor, was examined using atomic force microscopy (AFM), field-emission scanning electron microscopy (FESEM), Fourier-transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). The results confirmed that the addition of the inhibitor enhanced the corrosion resistance of Aluminium 8088 by approximately 27–82%. The inhibition efficiency decreased with an increase in solution temperature from 303 to 323 K, indicating that the green walnut husk (GWH) molecules were predominantly adsorbed onto the metal surface through physical interactions. Adsorption studies revealed that GWH acted as a mixed-type inhibitor and followed the Langmuir adsorption isotherm. AFM analysis further demonstrated that at the optimum inhibitor concentration of 400 ppm, the surface roughness of the corroded aluminium was reduced by nearly 22%. Studies using thermodynamics revealed a about 25% drop in the activation energy of the corrosion reaction. The predominant corrosion product on corroded surfaces, according to FTIR and XRD patterns, was hydrated iron chloride. In addition, the findings provide light on the GWH adsorption process. Outcomes of this study established that the walnut husk extract efficiently reduced the corrosion rate of Aluminium 8088, with inhibition efficacy cumulative with extract attention. The inhibition mechanism is credited to the adsorption of phytochemical constituents, forming a protective layer on the metal surface. This study attracts the potential of green walnut husk as effectual green inhibitor, low cost and biodegradable contributing a promising substitute to lethal synthetic inhibitors for protecting aluminium alloys in acidic environments.

Keywords: Corrosion inhibition, Aluminium 8088, Green walnut husk extract, Acidic medium, Agricultural waste, Eco-friendly inhibitor

How to cite this article:
Bhagyalakshmi H, Rajeshwari P, Pruthviraj R D. Performance Evaluation of Green Walnut Husk Waste Extract for Inhibiting Aluminium 8088 Corrosion in Acidic Solution. Journal of Modern Chemistry & Chemical Technology. 2026; 17(01):-.
How to cite this URL:
Bhagyalakshmi H, Rajeshwari P, Pruthviraj R D. Performance Evaluation of Green Walnut Husk Waste Extract for Inhibiting Aluminium 8088 Corrosion in Acidic Solution. Journal of Modern Chemistry & Chemical Technology. 2026; 17(01):-. Available from: https://journals.stmjournals.com/jomcct/article=2026/view=237466


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Ahead of Print Subscription Original Research
Volume 17
01
Received 27/01/2026
Accepted 28/01/2026
Published 24/02/2026
Publication Time 28 Days
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