EXPERIMENTAL SYNTHESIS, CHARACTERISATION, AND INHIBITION EVALUATION OF GREEN CORROSION INHIBITORS USING BIO-EXTRACTS

Journal: Acta Chemica Malaysia (ACMY)
Author: Ojike P. C., Ezeugo J.O, Ifediorah E. I
ISSN: 2576-6732
e-ISSN: 2576-6724

This is an open access journal distributed under the Creative Commons Attribution License CC BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited

DOI: 10.26480/acmy.01.2026.20.27

The growing environmental concerns associated with synthetic corrosion inhibitors have also heightened demand for environmentally friendly substitutes derived from natural sources. This paper assesses the synthesis and inhibition of green corrosion inhibitors from bio-extracts of Carica papaya leaf (CPL), Vernonia amygdalina leaf (VGL), and Annona muricata leaf (AML) on aluminium, mild steel, and zinc in HCl and H2SO4. Phytochemicals such as alkaloids, flavonoids, phenols, saponins, tannins, steroids, phytates, and glycosides were confirmed by phytochemical analysis. It was determined that the Bio-Extracts were described by Fourier Transform Infrared Spectroscopy (FTIR) and Gas Chromatography-Mass Spectrometry (GC-MS). Thermometric analysis and scanning electron microscopy (SEM) were used to evaluate corrosion inhibition. An optimal inhibition efficiency of 75.42 -84.56% was obtained with the extracts, which was due to the formation of protective Fe 2 + -extract complexes by adsorption on metal surfaces. FT-IR spectra have shown shifts in peak positions, indicating synergistic interactions between functional groups. These results demonstrated the possibility of using bio-extracts as non-toxic, sustainable industrial activity inhibitors.