Effect of Temperature on Corrosion Behavior of Carbon Steel in Soil

The effect of soil temperature on corrosion behavior of carbon steel in soil was studied by polarization curves, electrochemical impedance spectroscopy (EIS) and X-ray diffraction (XRD). The results showed that the corrosion rate of carbon steel increased with the increase of temperature from 25 ℃ to 75 ℃. EIS consisted of a capacitive loop at high frequency and an inductive loop at low frequency, which showed two time-constants. Charge transfer resistance decreased with the increase of temperature, and the control step for corrosion of carbon steel in the soil was activation polarization process. The corrosion products of carbon steel surface were mainly composed of Fe2O3, Fe3O4, SiO2 and Al2O3.