Platov South-Russian State Polytechnical University (NPI) (Novocherkassk, Russia)

E. A. Yatsenko, Dr. Eng., Prof., Head of the Dept. of General Chemistry and Technology of Silicates, Head of the Lab. of Fuel Energy Waste Recycling, e_yatsenko@mail.ru
A. V. Ryabova, Cand. Eng., Associate Prof., Dept. of General Chemistry and Technology of Silicates, Senior Researcher, Lab. of Fuel Energy Waste Recycling, annet20002006@yandex.ru
V. M. Kurdashov, Postgraduate Student, Dept. of General Chemistry and Technology of Silicates, Engineer, Lab. of Fuel Energy Waste Recycling, viktorkurdashov@yandex.ru
V. D. Tkachenko, Postgraduate Student, Dept. of General Chemistry and Technology of Silicates, Engineer, Lab. of Fuel Energy Waste Recycling, tkachenko.vadik2014@yandex.ru
L. V. Klimova, Cand. Eng., Associate Prof., Dept. of General Chemistry and Technology of Silicates, Senior Researcher, Lab. of Fuel Energy Waste Recycling, lyudmila.clim@yandex.ru
A. I. Izvarin, Assistant, Dept. of General Chemistry and Technology of Silicates, Research Engineer, Lab. of Fuel Energy Waste Recycling, andre.izvarin@yandex.ru

This article presents the results of a study of the technological properties of glass frit based on the aluminoborosilicate glassy system RO–R₂O–B₂O₃–Al₂O₃–SiO₂–TiO₂–F^-, intended for the formation of inorganic amorphized coatings providing internal protection for steel pipelines and fittings. The relevance of this study is determined by the need to increase the durability and reliability of pipeline systems subject to corrosive and hydroabrasive wear, as well as deposit formation. The aim of the study was a comprehensive study of the key technological characteristics of glass frit in the molten and solid states: spreadability, viscosity, wetting ability, and surface tension of the glassy melt, as well as the coefficient of linear thermal expansion (CLTE). Experimental studies were conducted in accordance with GOST R 52569–2018 and GOST R 50045–92 using dilatometry, the sessile drop method, and calculation methods (Appen, Dekker-Reznikova). It was found that the synthesized glass frit has a spreadability of 40.3 mm (with a minimum of 38 mm as the standard), an average viscosity of lg η = 2.99, and α = 103.8 x 10–7 K–¹, which is 13.5 % lower than the average LTEC value of low-carbon steel (α = 120 x 10–7 K–¹). The contact angle at a firing temperature of 850 °C is 17–25°, and the surface tension is 0.264 N/m. The obtained values satisfy the technological requirements for the formation of defect-free coatings, and the developed glass frit is recommended for single-layer enameling of steel pipelines and fittings.

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

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