Protection Effect of Mn0.5Mg0.5Fe2O4/Chitosane/Formaldehyde/Thiourea Nanocomposite on the Corrosion of 304 Stainless Steel

Stainless steels are known for their good corrosion resistance in many corrosive environments, but hydrochloric acid solution causes corrosion of it [1-3]. Therefore various types of inhibitors are injected into corrosive media to decrease the corrosion rate to safe level [2-4]. In this study, application of Mn0.5Mg0.5Fe2O4/Chitosane/Formaldehyde/Thiourea nanocomposites for corrosion protection of 304 stainless steel for the first time was reported. The nanocomposites was characterised through Fourier transform infrared (FTIR) spectroscopy, UV-visible (UV-vis) spectroscopy and field emission scanning electron micrographs (FESEM). The corrosion behavior of 304 stainless steel in hydrochloric acid solution without and with various concentration of nanocomposites was studied by using gravimetric method and electrochemical methods including potentiodynamic polarization method and electrochemical impedance spectroscopy (EIS) method. The surface of steel samples were analyzed by scanning electron microscopy for further verification. The effect of temperature on the corrosion behavior of steel in the absence and presence of nanocomposites was studied in the range of 25-65 °C. The results indicate that protective effect of nanocomposites is very good in very low concentrations.