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Corrosion inhibition performance and mechanism of Portulaca oleracea L. Extract on copper in sulfuric acid medium
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DOI：10.1016/j.jiec.2026.03.033.png)
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Abstract
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This work explored the corrosion inhibition effect of Portulaca oleracea L. extract (POLE). The inhibition effect of POLE on copper in 0.5 mol/L H2SO4 solution. Fourier transform infrared spectroscopy (FTIR) and liquid chromatography − mass spectrometry (LC − MS) analysis confirmed that the main plant components in POLE were Betaine, L-Phenylalanine, Malic acid, Choline, L-Isoleucine, DL-Tryptophan, Azelaic acid and 3-Hydroxybenzoic acid. Electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), quantum chemical calculation (QC) and molecular mechanics simulation were used to study the corrosion resistance of POLE in the presence and absence of POLE. The results showed that the corrosion inhibition rate of POLE on copper in H2SO4 solution reached 85%. SEM and AFM analysis confirmed that the copper surface was smoother when POLE was added to the aggressive solution. The dipole moments, Mulliken charges and Fukui parameters of the eight main molecules found in POLE were determined by theoretical calculations. The results show that POLE has the effect of inhibiting corrosion.
Keywords:
Corrosion inhibition
Portulaca oleracea L. extract
Copper
Sulfuric acid
Electrochemical analysis
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