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 Recycling, 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 Recycling, 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 Recycling, 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 Recycling, e-mail: tkachenko.vadik2014@yandex.ru

This article examines current issues related to the protection of steel pipelines in the oil and gas industry, with a focus on improving the adhesion of glass-enamel coatings to metal surfaces. The focus is on the influence of modifying additives on the adhesion strength of the coating to metal. This study analyzes existing glass-enamel coatings and identifies their key drawbacks associated with poor adhesion to metal surfaces. To address this issue, the influence of various modifying additives in the coating was studied, including copper (CuO) and antimony (Sb₂O₃) oxides, as well as sodium (NaNO₃) and potassium (KNO₃) nitrates. A method for preparing glass-enamel compositions with the addition of modifying components has been developed, including the stages of grinding, mixing, batch cooking, frit granulation, preparation of slip suspensions, and their application and firing on a metal base. Comprehensive testing of the adhesive properties of the resulting coatings was conducted using standard methods for assessing impact strength and relative adhesion strength. The study revealed that copper oxide (CuO) at a concentration of 2 % is the optimal modifying additive for glass-enamel frit milling. This additive ensures maximum relative adhesion strength between the coating and the metal, even with zero current in the electrical circuit, indicating the presence of an adhesive layer or the coating itself on the metal after deformation. The results obtained can be used in the development of new glassenamel coating compositions with improved protective properties for pipelines operating in aggressive environments. The proposed solutions will improve the durability and reliability of pipeline systems in the oil and gas industry.
This study 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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