The influence of temperature and pressure of hydrogen sulfide and carbon disoxide gas on corrosion of pipe steel of strength group Q125 in model stratal water

Keywords

pipe steel, hydrogen sulfide, carbon dioxide, model brine water, corrosion, microstructure.

Cite as

Vasyliv Kh. B., Chuchman M. R., Ivashkiv V. R., Datsko B. M., and Rizun Yu. Ya. The influence of temperature and pressure of hydrogen sulfide and carbon disoxide gas on corrosion of pipe steel of strength group Q125 in model stratal water. Physico­chemical Mechanics of Materials. 2022. 58(2), 013-019.

Abstract

It is shown, that the corrosion rate of steel Q125 in model brine water (MBW), saturated with CO₂, increases over time, indicating that carbonate films do not protect the steel against corrosion. Corrosion processes are accelerated at t = 60°С and P_СО2 = 6 MPa and corrosion changes from uniform to ulcerative one. The corrosion rate of steel in short-term tests in MBW+CO₂+H₂S is proportional to the concentration of H₂S in the solution and is determined by the cathode process rate. The mechanism of corrosion does not depend on the concentration of hydrogen sulfide in solution. Long-term studies in MBW+CO₂+H₂S show, that the corrosion rate of steel Q125 decreases ~ 2 times compared with one in MBW+CO₂ under normal conditions and 10–15 times at t = 60°C and P_CO2 = 6 MPa. The surface films of a mixture of maquinavit, troilite and impurities of oxides and hydroxides of iron are formed on the steel surface. The sulfide film is more compact, than carbonate film, and the corrosion rate is reduced. However, due to the porosity, the protective pro­perties of sulfides are not effective enough.

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