Effect of La-Ce on Corrosion Resistance of X70 Pipeline Steel

The effects of silicate inclusions on the corrosion resistance of X70 pipeline steel were analyzed by weight loss method, ectrochemical method and SEM. The results show that adding RE La-Ce changed the composition of inclusions, and thus improved corrosion resistance of X70. On the basis of the observation the effects of RE on the interlamellar spacing of pearlite, the relation between corrosion current density and the interlamellar spacing was also discussed.