On the corrosive impact of variable liquid wetting on the surface of pipe steel for gas lines in the presence of СО₂

The corrosion resistance in carbon dioxide environments of a number of structural steels used for pipelines of gas fields has been studied. The aggressive conditions of gas facilities are characterized by the fact that most of the internal space of pipelines is filled with the gas phase. Corrosion effects on steel, when only a small gas pipeline is filled with a liquid phase, have previously been practically unstudied. During the research, a corrosion stand specially designed for this purpose was used, on which some of the most aggressive conditions of alternating wetting of the gas pipeline wall with water were reproduced. The corrosive activity of such conditions is associated with the destruction of films of corrosion products. In places where they crack and peel, local corrosion damage forms on the steel. The corrosion behavior of pipe steels from different gas pipelines under conditions of variable wetting with water was studied. A comparative assessment of the resistance of pipe steels 09Mn2Si and 13KhFA in carbon dioxide environments under conditions of variable wetting and moisture condensation, the main effects of internal corrosion, was carried out. It was determined that the main type of destruction is local corrosion of the steel surface of the pipes. The influence of the microstructure of steels and their chromium content on their corrosion resistance under conditions of transport of CO2-containing gas through pipelines has been assessed.

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