Corrosion behavior of Q235 and X70 steels buried in soil at Singapore for one year

The short-term corrosion behavior of X70 steel and Q235 steel buried for 1 a in soil of a select site at Singapore were investigated in terms of characterizing the corrosion products by means of scanning electron microscopy and X-ray diffraction, as well as the physical and chemical parameters of the soil, and measuring the corrosion mass lass. It was found that the soil at the select site was an acidic soil; where the average corrosion rate of Q235 steel was higher than that of X70 steel; the two steels all suffered form local corrosion, while that of Q235 steel was more serious; the corrosion products of these two steels were similar and mainly composed of Fe₂O₃, Fe₃O₄, FeOOH and FeOCl, the surface of products were rough and there were some cracks in the products scale, which seemed harmful to its protectiveness.