Corrosion behavior of carbon steels in hot and dry atmosphere environment at Turpan area

The corrosion behavior and the relevant mechanism of carbon steels Q235 and Q450 exposed for 1 a in the hot and dry atmosphere environment at Turpan area was studied by weight lose test, scanning electron microscopy (SEM), energy dispersive spectra (EDS), X- ray diffraction (XRD) and stereological microscope. The results showed that the corrosion rate of carbon steel Q235 was greater than carbon steel Q450. The corrosion products on the surface of the carbon steels were consisted of α-FeOOH，γ-FeOOH and Fe₃O₄. The corrosion product of carbon steel Q235 was relatively loose for its rather low ratio of γ-FeOOH to α-FeOOH, whilst the corrosion product of carbon steel Q450 was dense for its higher ratio of γ-FeOOH to α-FeOOH. After removal of corrosion products, it could be observed that the depth and volume of corrosion pits of carbon steel Q235 was larger than those of carbon steel Q450.