The inhibition effect of Benzimidazole on Mild Steel in (HNO3 +HCl) binary acid mixture was studied by weight loss, Temperature effect methods and polarization techniques. Rate of Corrosion was increases with increase in concentration of acid mixture. The inhibition efficiency of Benzimidazole increased as the concentration of Benzimidazole Increased. The inhibitor is found to be an excellent corrosion inhibitor from the results obtained. The inhibition action depends on the chemical structure, concentration of the inhibitor and concentration of the corrosive medium. The values of activation energy (Ea), free energy of activation (ΔG°ads), Heat of adsorption (Qads), enthalpy of adsorption (ΔH0ads) and entropy of adsorption (ΔS0ads) were calculated. Corrosion rate increases while I. E. decreases with rise in temperature.
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