Adsorption and Corrosion Inhibition Properties of Cefadroxil on Mild Steel in Hydrochloric Acid

摘要

Corrosion inhibition of mild steel in 1M HCl by cefadroxil has been studied using electrochemicalimpedance spectroscopy (EIS), potentiodynamic polarization and weight loss methods. The inhibitor-4 -1 showed more than 96% inhibition efficiency at optimum concentration of 11.010 mol l . The resultsobtained by these techniques were well supported by the atomic force microscopy. Thermodynamicparameters obtained support physical adsorption mechanism and the experimental data fits well intothe Langmuir adsorption isotherm model. Potentiodynamic polarization suggests that cefadroxil act asmixed type inhibitor. Thermodynamic parameters suggest the adsorption is spontaneous andexothermic process. The results obtained from the three methods used are in good agreement.