Electrochemical and Thermodynamic Investigation of Nitrofurantoin as Effective Corrosion Inhibitor for Mild Steel in 1M Hydrochloric Acid Solution

摘要

In present study corrosion inhibition property of (E)-1-[(5-nitro-2furyl) methylideneamino]imidazolidine-2, 4-dione (Nitrofurantoin) in 1M HCl was investigated using weight loss,electrochemical impedance spectroscopy and potentiodynamic polarization, SEM and EDXtechniques. From weight loss and electrochemical measurements it is observed that inhibitionefficiency increases with Nitrofurantoin concentration and maximum efficiency (97.6) was obtained at50 ppm. The potentiodynamic study reveals that Nitrofurantoin is a mixed type inhibitor. Adsorptionof Nitrofurantoin on mild steel surface obeys the Langmuir adsorption isotherm. The morphology ofthe surface was examined by scanning electron microscopy (SEM), and the surface composition wasevaluated using energy-dispersive X-ray spectroscopy (EDX) to verify the presence of Nitrofurantoinon the mild steel surface. The effect of temperature on the corrosion rate was investigated and somethermodynamic parameters were also calculated in order to explain the mechanism of adsorption.