炭酸ガス溶液中におけるクロム鋼の腐食

抄録

The electrochemical study for CO₂ corrosion was carried out on various chromium steels under high temperature and pressure. The results are as follows. The corrosion potentials in the CO₂ solution were about 0.2V higher than those in deaerated solution. Passivity was not observed in the anodic polarization curves for carbon and low Cr content steels.
FeCO₃ films were formed on the surface in the CO₂ solution under 100°C, but above 150°C, Fe₃O₄ and Fe₂O₃ films were formed in deaerated and CO₂ solutions, respectively, for low Cr steels. NiO and Cr₂O₃ films were observed on the surface in high Ni and Cr steels at high temperature.
The contribution of an alloying element for the CO₂ corrosion increased with increasing chromium content.