Corrosion Resistance of 13Cr Stainless Steel in the Cl-, CO2 Environment with Microamount H2S

To evaluate the corrosion resistance of 1Cr13 and 0Cr13 in the Cl-, CO2 environment with microamount H2S, the autoclave was employed to investigate their corrosion behavior in simulating environment of oil and gas field. The corrosion product scale was analyzed by scanning electron microscope (SEM), energy dispersive X-ray spectrometer (EDS) and X-ray diffraction (XRD). The results showed that the average corrosion rate of 1Cr13 and 0Cr13 were very low, but there were localized corrosion exist. The pitting of 0Cr13 was more serious than 1Cr13. The corrosion rate was reduced rely on the compound of Cr in the passive film. The stainless steel corrosion resistance factors were discussed, including chemical composition, inclusion, grain size, microstructure and corrosion medium, and proved by metallographic examination.