Abstract:
The corrosion behavior of X80 pipeline steel was investigated in alkaline sand soil with saturated water by means of electrochemical measurement, scanning electron microscopy and energy dispersive spectrum analysis. The results show that the corrosion rate of X80 steel presented the variational trend from slow increase to rapid increase with the prolongation of corrosion time. After corrosion for 50 d, the corrosion products were the mixture of iron oxides, iron sulfides and small amount of salts in the soil. The corrosion resistance and corrosion morphology of the X80 steel were dependent on the integrality and compactness of corrosion product films.