Short-term corrosion behavior of X70 steel in Ku'erle soil

Corrosion behavior of X70 steels in Ku'erle soil saturated with water at 16°C, 32°C, and 45°C was studied through 32 days and 64 days burying by means of macroscopic observation, SEM, EDS, XRD, weight - loss method and electrochemical measurements etc. The results revealed that corrosion rates did not reach stabilization during the period of experimentation, and increased as the increasing of temperature. Meanwhile, it was found that serious general corrosion and pitting took place at 45°C and the content of Cl^- and whole salt dominated the corrosion severity. Cathodic reaction was mostly the oxygenic deoxidization at the temperature of 16°C and 32°C, and sulfate reduction reaction also occurred at 45°C.