Internal Corrosion Causes of Yu-Ji Natural Gas Transmission Pipeline

To clarify the internal corrosion reason of Yu-Ji natural gas transmission pipeline, the natural gas composition and pigging record were firstly investigated. Then the macroscopic morphology was observed, and microscopic morphology was observed by scanning electron microscopy. Corrosion products were analyzed by X-ray powder diffraction. According to the analysis results, localized corrosion existed in pipeline, and the corrosion products were mainly Fe2O3 and FeCO3.The key reason of internal corrosion was CO2 corrosion.