Effects of Simulated Sulfate-acid Rain on Macrocell Corrosion of Steel X70 in Soils

The effects of simulated sulfate-acid rain on the macrocell corrosion of steel X70 were investigated in soils by using electrochemical methods, scanning electron microscopy (SEM), and so on. The results showed that the steel, the potential of which shifted in the negative direction, was anode in the acidified soil, and the corrosion rate was enhanced. The corrosion rate of the anode of the macrocell increased with increasing the ratio of the cathodic area to anodic area. The corrosive coefficient was 4.32 at the ratio of 1∶1, and 18.29 at the ratio of 15∶1.