Hydrogen permeation behaviors of X52 pipeline steel in NACE a solution with saturated H₂S/CO₂

Abstract

With the aid of hydrogen permeating devices, the hydrogen permeation behaviors of X52 pipeline steel in NACE A solution with saturated H₂S/CO₂ were studied under the conditions of different ambient temperatures and pH values, and the hydrogen permeation behaviors of X52 pipeline steel in weld seam zone were comparatively studied. The experimental results show that the hydrogen permeation coefficient value is directly proportional to the time required for reaching the saturation anode current and inversely proportional to the saturation anode current, and the hydrogen permeation coefficient is influenced by the corrosion scales; the temperature is directly proportional to the saturation anode current, and the hydrogen permeation coefficient is influenced by the temperature and corrosion scales, heat-affected zone and matrix zone in NACE A solution with saturated H₂S/CO₂ at normal temperature. The hydrogen permeation coefficient in weld seam zone is larger than that in heat-affected zone which is further larger than that in matrix zone.

Keywords

pH value / temperature / NACE A solution / H₂S/CO₂ environment / weld seam / pipeline steel / hydrogen permeation

References

[1] Toshimitsu Yokobori A. Jr, Yasrou C., Takenao N., Koji S., Tetsuya Yamada. The Characteristic of Hydrogen Diffusion and Concentration Around a Crack Tip Concerned with Hydrogen Embrittlement[J]. Corrosion Science, 2001, 44(3): 407-424.

[2] Symons D.M. A Comparison of Internal Hydrogen Embrittlement and Hydrogen Environment Embrittlement of X-750[J]. Engineering Fracture Mechanics, 2001, 68(6): 751-771.

[3] Leeuwen H.P.V. A Failure Criterion for Internal Hydrogen Embrittlement[J]. Fracture Mechanics, 1997, 9(2): 291-296.

[4] Guerreroa M., Betegónb C., Belzuncec J. Fracture Analysis of a Pressure Vessel Made of High Strength Steel (HSS)[J]. Engineering Failure Analysis, 2008, 15(3): 208-219.

[5] Kim Y., Chao Y.J., Pechersky Marty J., Morgan Michael J. On the Effect of Hydrogen on Fracture Toughness of Steel[J]. International Journal of Fracture, 2005, 134(3–4): 339-347.