CO₂ Corrosion Behavior of Three kinds of Pipeline Steels with Different Cr Contents

The corrosion behavior of three kinds of pipeline steels with different Cr contents, induding 316L,13Cr and 3Cr, in simulated CO2 gathering system was investiguated by weight loss method, scanning electron microscopy (SEM), energy dispersive X-ray spectrometer (EDS) and so on. The results show that in the simulated corrosive environment, 316L suffered mild corrosion, 13Cr suffered moderate corrosion and 3Cr suffered very severe corrosion and 13Cr suffered Cl- pitting. The corrosion resistance of these three materals is in the following order: 316L>13Cr>3Cr. The composite pipe lined with 316L is recommerded as the anti-corrosion material of Yakela gas field gathering and transportation pipelines.