Corrosion and tribocorrosion of 07Х16Н6 steel in hydrogen sulfide media

Keywords

steel 07Kh16N6, corrosion, hydrogenation, tribocorrosion, chloride-acetate solution, hydrogen sulfide, concentration.

Cite as

Khoma M. S., Vynar V. A., Ratska N. B., Patsai I. O., Pokhmurskii V. I. and Yurkevych R. M. Corrosion and tribocorrosion of 07Х16Н6 steel in hydrogen sulfide media. Physico­chemical Mechanics of Materials. 2022. 58(2), 005-012.

Abstract

The influence of hydrogen sulfide concentration (0–1500 mg/dm³) in chloride-acetate solutions on corrosion processes, hydrogenation and corrosion-mechanical wear of 07Kh16N6, steel has been studied. It is found that the corrosion resistance of steel in chloride-acetate solutions, regardless of the hydrogen sulfide content, is much lower than in the medium without hydrogen sulfide, in which its passivation is manifested. Corrosion pro­ducts are formed on the surface of steel, consisting of oxide-sulfide compounds, the thick­ness of which increases with increasing hydrogen sulfide concentration and at a hydrogen sulfide concentration of 1500 mg/dm³ their upper layer loses continuity. The tribocorro­sion characteristics of steel at hydrogen sulfide concentrations of 100 and 500 mg/dm³ do not change significantly, and at 1000 and 1500 mg/dm³ they decrease by ~ 30%. Corro­sion processes have a decisive influence on the corrosion and mechanical wear of steel in environments with different hydrogen sulfide content, which is associated with hydrogenation of surface layers and intensive restoration of homogeneous oxide-sulfide films on the surface of friction tracks during frictional contact.

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