Platov South-Russian State Polytechnical University, Novocherkassk, Russia
E. A. Yatsenko, Dr. Eng., Prof., Head of the Dept. of General Chemistry and Technology of Silicates, Head of the Lab. of Recycling of Fuel Energy Waste, e-mail: e_yatsenko@mail.ru
A. V. Ryabova, Cand. Eng., Associate Prof., Dept. of General Chemistry and Technology of Silicates, Senior Researcher, Lab. of Recycling of Fuel Energy Waste, e-mail: annet20002006@yandex.ru
V. M. Kurdashov, Postgraduate Student, Dept. of General Chemistry and Technology of Silicates, Engineer, Lab. of Recycling of Fuel Energy Waste, e-mail: viktorkurdashov@yandex.ru
V. D. Tkachenko, Postgraduate Student, Dept. of General Chemistry and Technology of Silicates, Engineer, Lab. of Recycling of Fuel Energy Waste, e-mail: tkachenko.vadik2014@yandex.ru

The article considers current problems of steel pipeline protection for the oil and gas industry. Particular attention is paid to the analysis of the application of traditional steel grades (St3, St20, 09G2S) and the problems of their operation associated with internal and external corrosion during transportation of aggressive environments and various environmental factors. Inorganic glass enamel coatings were selected as a protective coating for steel pipelines, and their advantages and disadvantages were considered. It was found that the main problem of these coatings is insufficient corrosion resistance. It was revealed that coatings that demonstrate resistance to the effects of one or more reagents may be ineffective with respect to other aggressive environments. Oxide and mineral modifying additives are considered to increase corrosion resistance. As a result of the analysis of scientific literature, zirconium oxide (ZrO₂) and the mineral additive strontianite (SrCO₃) were selected, which form a dense protective layer that prevents the penetration of aggressive environments, and also improve the adhesion properties and reduce the porosity of the coating. Methods for preparing raw materials, melting glass mass and granulating frits are given. Corrosion resistance studies were carried out in accordance with GOST 24788-2018 using 4 % acetic acid. Microstructures of the developed inorganic glass enamel coatings are considered, at a magnification of 50×. As a result of this study, it was found that the composition with the addition of 6 % zirconium oxide as a modifying additive shows the greatest corrosion resistance. The results can be used in the development of new compositions of glass enamel coatings for the protection of pipelines with improved protective characteristics.

This research was supported by the Russian Science Foundation grant No. 25-49-00002, https://rscf.ru/project/25-49-00002/ “Principles of Modification of Amorphized Inorganic Coatings with Improved Adhesion, Thermal Conductivity, and Corrosion Resistance for Energy Infrastructure Facilities” (supervisor – E. A. Yatsenko).

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