Hydrogen Permeation and Corrosion Fatigue Crack Growth Rates of X65 Pipeline Steel Exposed to Acid Brines Containing Thiosulfate or Hydrogen Sulfide

Corrosion fatigue crack growth rates were obtained for X65 pipeline steel in acid brines containing thiosulfate (S2O32−) or hydrogen sulfide (H2S). Samples were exposed for 72 h at the open-circuit potential to allow bulk hydrogen charging. The corrosion fatigue crack growth rate increased with partial pressure of H2S and correlated with the steady-state flux of hydrogen permeation during corrosion in the same solutions. The rate of hydrogen absorption increased with increasing S2O32− concentration to a maximum at 10−3 M S2O32−, owing to a competition between increased surface concentration of H2S from S2O32− reduction and increased rate of iron sulfide film formation. Corrosion fatigue behavior in S2O32−-containing acidified brines is the same as in solutions with low partial pressures of H2S, in accordance with predictions from the hydrogen permeation results. This suggests that, for corrosion fatigue studies, S2O32− solutions are possible candidates for replacement of H2S gas, as long as the H2S partia...

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