Influence of H₂S Partial Pressure on Corrosion Behavior of Super Anti-sulfide Well Tube Steel SM80SS in CO₂/H₂S Environment

Corrosion behavior of super anti-sulfide well tube steel SM80SS was studied in the CO2/H2S environment.The results showed that CO2 was the major reactant at low PH2S,the corrosion product film consisted of FeS0.9 and FeCO3 was fine and compact,the average corrosion rate was low.As PH2S increased,FeS0.9 was changed to FeS,H2S was the major reactant and the corrosion product film was coarse and loose.when PH2S increased further,the corrosion product film became fine and compact again,average corrosion rate increased firstly and then decreased.FeS could obstruct the formation of FeCO3.Corrosion mode was uniform corrosion.