article · International Journal of Electrochemical Science
This research evaluates leaf extracts of Cordia sebestena as an eco-friendly corrosion inhibitor for mild steel exposed to a 0.5 M sulphuric acid solution. Using weight loss measurements across temperatures from 303 to 333 Kelvin, the study shows that inhibition efficiency rises with higher concentrations of the extract. At 303 Kelvin, a 50 percent volume concentration achieved an efficiency of 95.79 percent, which further increased to 99.09 percent when combined with 5 millimolar potassium iodide. The performance declined as the temperature increased, indicating that the inhibition occurs via physical adsorption. The adsorption process was found to follow the Langmuir isotherm model. In addition, calculated synergism values exceeded unity, confirming a synergistic performance boost between the plant extract and iodide ions.
Mild steel is widely used across various industries, but it rapidly degrades in acidic conditions. Finding effective inhibitors derived from natural plant sources provides a potentially safer alternative to hazardous synthetic chemical additives. Demonstrating that combining plant extracts with iodide ions significantly boosts protection offers a pathway towards formulating more effective metal protection strategies.
This work demonstrates an early-stage laboratory finding for developing plant-based corrosion inhibitor formulations. Potential users include manufacturers and chemical formulators seeking additives to protect mild steel equipment during acidic processes. Because testing was limited to laboratory-scale weight loss measurements in sulphuric acid, substantial further testing and formulation development are required before practical industrial deployment.
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The inhibitive action of leaf extracts of Cordia sebestena on corrosion of mild steel in 0.5 M H2SO4 solution was studied by weight loss measurement at 303-333K. Results indicate that leaf extracts of Cordia sebestena is a good inhibitor for mild steel corrosion in 0.5 M H2SO4. The inhibition efficiency was found to increase with increase in extracts concentration. A maximum inhibition efficiency of 95.79% was obtained for 50%v/v at 303K, which increased to 99.09% in the presence of 5mM KI. Temperature studies revealed a decrease in inhibition efficiency with increase in temperature, which suggests physical adsorption mechanism. The adsorption characteristics of leaf extracts of Cordia sebestena on mild steel surface obeys Langmuir isotherm. Both kinetic parameters and thermodynamics of adsorption (enthalpy of adsorption, entropy of adsorption and Gibbs free energy) were calculated and discussed. The values of synergism parameter were greater than unity, which suggests synergistic effect between the leaf extracts and KI.
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DOI: 10.1016/s1452-3981(23)19625-8
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