Appraising the corrosion inhibitory efficacy and adsorption mechanism of leaf extract of Datura discolor on low-carbon steel in low pH media via gravimetric experiments and AFM analysis
Abstract Background The study investigated the inhibitory action of Datura discolor leaf extract against the corrosion of low-carbon steel in 0.5 M solutions of three acids. The purpose was to ascertain the effect of extract concentration, immersion time and temperature variation on corrosion inhibi...
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2024-10-01
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| Series: | Bulletin of the National Research Centre |
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| Online Access: | https://doi.org/10.1186/s42269-024-01272-5 |
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| author | Cornelius C. Ahanotu Veronica O. Ezigbo Sylvia I. Okonkwo Kenneth C. Madu |
| author_facet | Cornelius C. Ahanotu Veronica O. Ezigbo Sylvia I. Okonkwo Kenneth C. Madu |
| author_sort | Cornelius C. Ahanotu |
| collection | DOAJ |
| description | Abstract Background The study investigated the inhibitory action of Datura discolor leaf extract against the corrosion of low-carbon steel in 0.5 M solutions of three acids. The purpose was to ascertain the effect of extract concentration, immersion time and temperature variation on corrosion inhibitory efficiency, and to relate to existing reports which show that organic molecules in most plant extracts inhibit corrosion. Extraction of the leaves was done by maceration using methanol, and solvent was removed by evaporation to dryness. Classical gravimetric (mass loss) experiments were used, and experimental data were fitted to adsorption isotherm models to ascertain the best approximation. Surface examination of the low-carbon steel substrates was carried out using the atomic force microscope. Results Inhibitory protective efficiency of extract was found to appreciate with increasing Datura discolor leaf extract concentration at a fixed temperature, with values ranging 77.6–88.8%, 91.35–98.08% and 19.64–44.64% in H2SO4, HCl and HNO3 solutions respectively at 27 °C. Elevation of temperature was found to depreciate the inhibitor efficiency at constant inhibitor concentration. Best isotherm model fitting was obtained with Langmuir model both at 27 °C and 60 °C and in all the hostile media, while Temkin model gave good approximation only at 60 °C and in H2SO4 and HCl solutions only. The negative values of free energy of adsorption $$(\Delta G_{{{\text{ads}}}}^{0} )$$ ( Δ G ads 0 ) suggested that the adsorptive interaction of the inhibitor with the substrate surface was very spontaneous. Values of $$\Delta G_{{{\text{ads}}}}^{0}$$ Δ G ads 0 were all consistent, fluctuating between − 16.35 and − 17.63 kJ mol−1 in both H2SO4 and HCl solutions, and between − 9.76 and − 10.25 kJ mol−1 in HNO3 solution, and this suggests that adsorption of the inhibitor molecules occurred via physisorption. Values of the activation energy of the corrosion reaction $$(E_{{{\text{act}}}} )$$ ( E act ) are all < 40 kJ mol−1, suggesting that the inhibition occurred by a physical adsorption mechanism. Conclusions The study concludes that Datura discolor crude leaf extract suppressed the corrosion reactions, and the inhibition was found to arise from the physisorptive interaction of the organic molecules with the substrate/solution interface, forming a stabilize inhibitor film on the substrate surface as revealed by the atomic force micrographs. |
| format | Article |
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| spelling | doaj-art-a604bb012ff24923bf31a805c79c11fc2025-08-20T02:18:10ZengSpringerOpenBulletin of the National Research Centre2522-83072024-10-0148111610.1186/s42269-024-01272-5Appraising the corrosion inhibitory efficacy and adsorption mechanism of leaf extract of Datura discolor on low-carbon steel in low pH media via gravimetric experiments and AFM analysisCornelius C. Ahanotu0Veronica O. Ezigbo1Sylvia I. Okonkwo2Kenneth C. Madu3Department of Science Laboratory Technology, Imo State PolytechnicDepartment of Pure and Industrial Chemistry, Chukwuemeka Odumegwu Ojukwu UniversityDepartment of Pure and Industrial Chemistry, Chukwuemeka Odumegwu Ojukwu UniversityDepartment of Science Laboratory Technology, Imo State PolytechnicAbstract Background The study investigated the inhibitory action of Datura discolor leaf extract against the corrosion of low-carbon steel in 0.5 M solutions of three acids. The purpose was to ascertain the effect of extract concentration, immersion time and temperature variation on corrosion inhibitory efficiency, and to relate to existing reports which show that organic molecules in most plant extracts inhibit corrosion. Extraction of the leaves was done by maceration using methanol, and solvent was removed by evaporation to dryness. Classical gravimetric (mass loss) experiments were used, and experimental data were fitted to adsorption isotherm models to ascertain the best approximation. Surface examination of the low-carbon steel substrates was carried out using the atomic force microscope. Results Inhibitory protective efficiency of extract was found to appreciate with increasing Datura discolor leaf extract concentration at a fixed temperature, with values ranging 77.6–88.8%, 91.35–98.08% and 19.64–44.64% in H2SO4, HCl and HNO3 solutions respectively at 27 °C. Elevation of temperature was found to depreciate the inhibitor efficiency at constant inhibitor concentration. Best isotherm model fitting was obtained with Langmuir model both at 27 °C and 60 °C and in all the hostile media, while Temkin model gave good approximation only at 60 °C and in H2SO4 and HCl solutions only. The negative values of free energy of adsorption $$(\Delta G_{{{\text{ads}}}}^{0} )$$ ( Δ G ads 0 ) suggested that the adsorptive interaction of the inhibitor with the substrate surface was very spontaneous. Values of $$\Delta G_{{{\text{ads}}}}^{0}$$ Δ G ads 0 were all consistent, fluctuating between − 16.35 and − 17.63 kJ mol−1 in both H2SO4 and HCl solutions, and between − 9.76 and − 10.25 kJ mol−1 in HNO3 solution, and this suggests that adsorption of the inhibitor molecules occurred via physisorption. Values of the activation energy of the corrosion reaction $$(E_{{{\text{act}}}} )$$ ( E act ) are all < 40 kJ mol−1, suggesting that the inhibition occurred by a physical adsorption mechanism. Conclusions The study concludes that Datura discolor crude leaf extract suppressed the corrosion reactions, and the inhibition was found to arise from the physisorptive interaction of the organic molecules with the substrate/solution interface, forming a stabilize inhibitor film on the substrate surface as revealed by the atomic force micrographs.https://doi.org/10.1186/s42269-024-01272-5Datura discolorAngel’s trumpetInhibitor efficiencyAdsorption isothermsCorrosion inhibitorWeight-loss experiments |
| spellingShingle | Cornelius C. Ahanotu Veronica O. Ezigbo Sylvia I. Okonkwo Kenneth C. Madu Appraising the corrosion inhibitory efficacy and adsorption mechanism of leaf extract of Datura discolor on low-carbon steel in low pH media via gravimetric experiments and AFM analysis Bulletin of the National Research Centre Datura discolor Angel’s trumpet Inhibitor efficiency Adsorption isotherms Corrosion inhibitor Weight-loss experiments |
| title | Appraising the corrosion inhibitory efficacy and adsorption mechanism of leaf extract of Datura discolor on low-carbon steel in low pH media via gravimetric experiments and AFM analysis |
| title_full | Appraising the corrosion inhibitory efficacy and adsorption mechanism of leaf extract of Datura discolor on low-carbon steel in low pH media via gravimetric experiments and AFM analysis |
| title_fullStr | Appraising the corrosion inhibitory efficacy and adsorption mechanism of leaf extract of Datura discolor on low-carbon steel in low pH media via gravimetric experiments and AFM analysis |
| title_full_unstemmed | Appraising the corrosion inhibitory efficacy and adsorption mechanism of leaf extract of Datura discolor on low-carbon steel in low pH media via gravimetric experiments and AFM analysis |
| title_short | Appraising the corrosion inhibitory efficacy and adsorption mechanism of leaf extract of Datura discolor on low-carbon steel in low pH media via gravimetric experiments and AFM analysis |
| title_sort | appraising the corrosion inhibitory efficacy and adsorption mechanism of leaf extract of datura discolor on low carbon steel in low ph media via gravimetric experiments and afm analysis |
| topic | Datura discolor Angel’s trumpet Inhibitor efficiency Adsorption isotherms Corrosion inhibitor Weight-loss experiments |
| url | https://doi.org/10.1186/s42269-024-01272-5 |
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