In this paper, electrochemical hydrogen permeation method is employed to investigate the effects of
H2S/CO2 corrosion scales on the hydrogen permeation of pipeline steel. In order to reveal the mechanisms of this kind of phenomena under high H2S partial pressure, high temperature and pressure corrosion simulation experiments and Devanathan-Stachurski cell tests are used to analyze
the effects of different corrosion product scales on hydrogen permeation under various H2S
containing environment condition. The results show that, the scale dominated by Mackinawite
promoted the hydrogen permeation behavior, otherwise the scale dominated by Pyrrhotite reduced
the steady state flux of hydrogen.
Key words: H2S/CO2 corrosion, corrosion scale, hydrogen permeation, pipeline steel