The expired desloratidine drug was examined as an inhibitor for carbon steel (X52) corrosion in 1M HClsolution. The inhibition conduct of desloratidine was studied utilizing potentiodynamic polarization andweight loss techniques. The drug efficacy as inhibitor was found to rise by increasing the desloratidineconcentration and reduces by increasing temperature. Morphology of the surface and the adsorptionisotherm were also studied. The heat of adsorption (Qads) and activation energy (Ea) were computed andelucidated. Based on adsorption of desloratidine molecules on carbon steel surface leading to conservethe carbon steel surface from the offensive ions, the inhibition conduct was explicated.
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