Effect of Cefazolin on the corrosion of mild steel in HCl solution

Abstract

The adsorption and inhibition effect of Cefazolin on mild steel in 1.0 M HCl at 308-338 K was studied by weight loss, EIS, potentiodynamic polarization and atomic force microscopy techniques. The results showed that inhibition efficiency increased with inhibitor concentration. The adsorption of Cefazolin on mild steel surface obeys the Langmuir adsorption isotherm equation. Both thermodynamic (enthalpy of adsorption Δ Hads{ring operator}, entropy of adsorption Δ Sads{ring operator} and free energy of adsorption Δ Gads{ring operator}) and kinetic parameters (activation energy Δ Ea{ring operator} and pre-exponential factor A) were calculated and discussed. Polarization curves showed that Cefazolin acted as mixed-type inhibitor controls predominantly cathodic reaction. © 2009 Elsevier Ltd. All rights reserved.