St. Petersburg Mining University, St. Petersburg, Russia

E. I. Pryakhin, Dr. Eng., Prof., Head of the Dept. of Materials Science and Technology of Artistic Processing of Materials, e-mail: e.p.mazernbc@yandex.ru
V. A. Azarov, Postgraduate Student, Dept. of Materials Science and Technology of Artistic Processing of Materials, e-mail: azarovvolodya@yandex.ru

Currently, one of the most important tasks being solved in the Russian oil and gas complex is ensuring the energy efficiency of new projects. Thus, with the commissioning of new natural gas fields in the Far North, the share of heavy components in hydrocarbon mixtures transported through pipeline systems increases. This leads to a qualitative change in transportation conditions and, accordingly, to the need to adopt additional technical solutions to protect pipes from corrosion and reduce pressure losses along the length of the pipeline. One of the effective ways to reduce energy losses during the transportation of natural gas and protect the inner wall of the pipeline from corrosion damage is the use of internal smooth polymer coatings, which provide the least resistance to the walls of steel pipelines during the transportation of natural gas. Currently, epoxy coatings have received the greatest practical use for this, which do not provide the required efficiency in all options for transporting natural gas from new fields through pipelines, especially when transporting in cold climate zones (–(30–50) °C). At these temperatures, the relatively brittle epoxy coating can crack and fail. In this regard, a fluoroplastic coating, which is known for its anti-friction properties and retains plasticity at negative temperatures, can be considered as a promising option. However, the fluoroplastic coating simultaneously has low adhesive properties, including low adhesive strength when applied to the steel surface of the pipe. Therefore, for its application, it is important to find technological solutions that can increase the adhesive bond between the proposed polymer fluoroplastic coating and the steel base of the pipe. This article discusses the preliminary preparation of the surface of a steel plate to ensure a good adhesive bond between it and the proposed fluoroplastic coating.

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