Electrochemical investigation of corrosion behavior of carbon steel C1010 in distilled water and anti freezing solution in presence of inorganic inhibitors

In this study, the corrosive behavior of carbon steel C1010 was investigated in the solution of distilled water containing 30% by weight of mono ethylene glycol (MEG) and four different mixed inorganic inhibitors in their optimum concentration. Indeed, to increase the synergetic effect of inorganic inhibitors, four mixedinhibiting systems including nitrite-silicate, molybdate-phosphate, molybdate-nitrite and molybdate silicate were utilized. The electrochemical measurements were conducted by the polarization and electrochemical impedance spectroscopy (EIS) techniques at constant temperature of 70 °C after 1 and 60 days of immersion time. The obtained results from both the polarization and EIS techniques had a good agreement in the prediction of corrosion behavior. For all of the inhibiting systems, anticorrosive resistance of metal has been increased rather to the non-inhibiting system during the immersion time. In addition, the inhibitor of molybdate-nitrite showed the best anticorrosive function.