Effect of Medium Flow Velocity on Corrosion Performance of X60 Pipeline Steel under High CO₂ Pressure

Using an autoclave with stirring equipment, the effect of flow velocity on the corrosion performance of X60 pipeline steel in rotating corrosion media under the condition of 60 ℃, 5 MPa CO2 was investigated. The results reveal that the flow of corrosion media can accelerate the corrosion rate, and the corrosion rate was non-linear with the flow velocity. The flow of corrosion media made the corrosion mode changed from uniform corrosion to localized corrosion, and then to uniform corrosion again. The surface and cross-section morphology of corrosion product films also changed with the change of flow velocity.