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This study investigates the corrosion inhibition performance of a newly synthesized quinazolinone
derivative, AMQ, on mild steel in a hydrochloric acid medium. The inhibition efficiency was evaluated using
potentiodynamic polarization at varying inhibitor concentrations (100–250 ppm) and temperatures (303–
333 K). The results showed that AMQ exhibited effective corrosion inhibition, with the highest efficiency of
74% observed at 250 ppm and 323 K. Density Functional Theory (DFT) calculations were conducted to study
the electronic properties of AMQ and its adsorption behavior. The thermodynamic parameters, including
activation energy, enthalpy, and Gibbs free energy, were calculated, indicating spontaneous adsorption of
AMQ onto the meta
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