article · International Journal of Electrochemical Science
This laboratory study evaluated the performance of 4-aminoantipyrine as a corrosion inhibitor for mild steel exposed to sulphuric acid across temperatures ranging from 303 to 323 Kelvin. Using weight loss measurements alongside computational methods, the research established that 4-aminoantipyrine effectively mitigates steel degradation in acidic conditions. Protection efficiency improved with higher concentrations of the compound and was further enhanced through synergistic additions of potassium iodide and potassium thiocyanate. However, efficiency declined as temperature rose, pointing towards a physical adsorption mechanism. The compound binds to the metal surface according to the Langmuir adsorption isotherm model. Thermodynamic parameters, including enthalpy, entropy, and Gibbs free energy of adsorption, were quantified to clarify the surface interactions. Density functional theory calculations provided molecular electronic profiles that correlated structural properties with the observed inhibition behaviour.
Mild steel is widely used in industrial infrastructure, but it degrades quickly when exposed to acidic environments such as sulphuric acid. Identifying effective organic compounds that hinder this degradation helps prolong equipment lifespan and reduce replacement costs. Understanding how such inhibitors interact at the molecular level allows for better selection and formulation of protective chemical treatments in industrial maintenance.
This work represents early-stage laboratory research demonstrating the basic inhibition capability of 4-aminoantipyrine in an acidic setting. Potential applications lie in industrial acid pickling, cleaning formulations, or asset maintenance where mild steel requires temporary chemical protection. Chemical formulators and asset managers in heavy industry could find value in these findings, though formulation stability, field trials, toxicity, and cost-effectiveness must be examined before commercial use.
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The inhibitive effect of 4-Aminoantipyrine (4-AAP) on the corrosion of mild steel in 0.5 M H2SO4 solution at 303 – 323 K was studied by weight loss measurement as well as computational techniques. Results obtained showed that 4-aminoantipyrine (4-AAP) is a good inhibitor for the corrosion of mild steel in sulphuric acid solution. The inhibition efficiency increased with 4-AAP concentration and also synergistically increased in the presence of KI and KSCN, but decreased with temperature, which is suggestive of physical adsorption mechanism. The adsorption of 4-AAP onto the mild steel surface was found to follow the Langmuir adsorption isotherm. Thermodynamics of adsorption such as enthalpy of adsorption, entropy of adsorption, equilibrium of adsorption and Gibbs free energy, were calculated and discussed. Quantum chemical calculations using DFT at the B3LYP/6-31G* level of theory was further used to calculate some electronic properties of the molecule in order to ascertain any correlation between the inhibitive effect and molecular structure of 4-aminoantipyrine.
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DOI: 10.1016/s1452-3981(23)13357-8
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