Corrosion Behavior of Heat-Resistant Materials in High-Temperature Carbon Dioxide Environment

The corrosion behavior of several heat-resistant steels and alloys, viz. T24, T91, Super 304H, and Haynes 282, in carbon dioxide environment at 600A degrees C has been investigated. X-ray diffraction analysis, scanning electron microscopy, and glow-discharge optical emission spectrometry were employed to characterize the corrosion products. The results showed that the corrosion kinetics of the investigated materials followed a parabolic law. Super 304H and Haynes 282 exhibited superior corrosion resistance due to their higher Cr and Ni contents. Severe carburization of T91 was found because of the quick diffusion rate of carbon or carbon ion, which was detected underneath the oxide layers. In addition to internal carburization of metal, carbon was also found at the surface of samples.