article · Chemical Data Collections
This research evaluates a methanolic extract of the plant Pelargonium graveolens as an environmentally friendly corrosion inhibitor for mild steel submerged in a sulphuric acid solution. Chemical analysis using gas chromatography mass spectrometry and Fourier transform infrared spectroscopy identified the phenolic compounds present in the extract. Electrochemical testing across temperatures from 298 K to 328 K and concentrations between 25 ppm and 200 ppm showed that protective performance improves at higher concentrations, reaching a peak inhibition efficiency of 96.2 percent at 200 ppm. Microscopic examination of the mild steel surface confirmed the protective effect. The extract adheres to the steel surface according to the Langmuir adsorption model, functioning through a mixed cathodic inhibition mechanism based on kinetic and thermodynamic analyses.
Mild steel degrades rapidly in harsh acidic environments, causing structural and industrial damage. Using plant-derived compounds offers a less toxic, renewable alternative to synthetic chemical inhibitors. This study demonstrates that Pelargonium graveolens extract effectively shields steel against acid corrosion, supporting the development of cleaner materials protection methods.
The findings could enable the development of plant-based corrosion inhibitor additives for industries that handle sulphuric acid and mild steel components. Potential users include manufacturers of industrial cleaning, descaling, or pickling formulations. At this stage, the research is early-stage laboratory testing, requiring further scale-up, stability trials, and formulation work before practical application.
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The purpose of our research is to determine the efficiency of “Pelargonium gravelons” (PGE) extract as green corrosion inhibitor of mild steel in an acidic medium (H2SO4 0.5 M). After the plant harvest and preparation, we extracted the phenolic compounds using methanolic solution, and in order to identify their chemical composition we used gas chromatography–mass spectrometry and Fourier transform infrared spectrometer. Later the electrochemical impedance spectroscopy (EIS) method and Tafel polarization method, bode tracings were used to determine the corrosion inhibition efficiency of our studied extract at different concentration range (25 ppm–50 ppm-100 ppm-200 ppm) and a temperature range of 298 K to 328 K, and for the work electrode which is mild steel we used scanning electron microscopy (SEM-EDX). The results show that the inhibitory efficiency of our extract increases with increasing concentrations to reach 96.2% in a concentration of 200 ppm. The adsorption properties of the PGE extract were investigated using Langmuir isotherm model, also the inhibition mechanisms, assessed on the basis of inhibition potency, temperature, kinetic and activation parameters, show that the plant extract has a mixed cathodic inhibition mechanism.
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DOI: 10.1016/j.cdc.2023.101084
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