Effect of Flow Rate on Corrosion of L485 Steel in CO₂/O₂ Environment

In order to study the effect of flow rate on corrosion behavior of L485 steel in CO₂/O₂ coexistence environment, corrosion simulation tests were carried out in a high-temperature and high-pressure dynamic reactor. The uniform corrosion rate of L485 steel was tested. Sanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) were used to examine the morphology and composition of corrosion products. The results show that in the CO₂/O₂ coexistence system, the uniform corrosion rate of L485 steel gradually increased as the flow rate increased. The surface of L485 steel presented the characteristics of transition from localized corrosion to uniform corrosion. The corrosion products of L485 steel in CO₂/O₂ coexistence system were mainly Fe₂O₃, FeOOH, Fe(OH)₃, Fe₃O₄, FeCO.