CORROSION BEHAVIOR OF N80 TUBING STEEL IN MEDIUM CONTAINING CARBON DIOXIDE,HYDROGEN SULFIDE AND HIGH CHLORINE IONS
N80抗硫油管钢在含CO2、微量H2S及高浓度Cl-腐蚀介质中的腐蚀行为

Corrosion behavior of N80 tubing steel is studied in a medium containing carbon dioxide, a little hydrogen sulfide and high chlorine ions. The results show that H2S is the main reaction product. FeS comes into being firstly during the progress of the experiment, then it holds back the forming of FeCO3 which then further strongly suppresses the formation of FeCO3. Corrosion product films are loose, the average corrosion rate is high, and there is slight local corrosion occurred on the surface of N80 tubing steel. High Cl^- concentration of the medium and high Cr content the steel enhanced the tendency of local corrosion.