Evaluation of expired linezolid and norfloxacin drugs as proficient environmentally safe inhibitors for mitigation of aluminum corrosion in sodium chloride medium

This paper highlighted how the expired linezolid and norfloxacin drugs can inhibit the corrosion of aluminum in 1.0 M NaCl. Chemical, electrochemical and microscopic tools were employed. The calculated inhibition efficiencies (% IEs) of the drugs were raised with their concentrations. The corrosion rate of aluminum was increased with rising [NaCl] and the% IEs were increased with the drugs' concentration and reduced with rising temperature. The acquired higher% IEs were ascribed to strong adsorption of the drugs' molecules on the aluminum surface and such adsorption was agreed with Langmuir isotherm. Thermodynamic and kinetic parameters were calculated that confirm the mechanism of physical adsorption. The used expired drugs behaved as mixed-kind inhibitors with cathodic priority. The kinetics and mechanisms of corrosion of aluminum and its inhibition by such drugs were explained. The gained results regarding to% IEs illuminated a good concordance between all utilized techniques.