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Coating and surface finishing
ArticleName The study of the microstructure of glass composite coatings to protect steel pipelines against internal and external corrosion
ArticleAuthor E. A. Yatsenko, B. M. Goltsman, A. V. Ryabova

Platov South Russian State Polytechnic University (Novocherkassk, Russia):

E. A. Yatsenko, Dr. Eng., Prof., Head of “General Chemistry and Technology of Silicates” Dept., E-mail:
B. M. Goltsman, Cand. Eng., Associate Prof., “General Chemistry and Technology of Silicates” Dept., E-mail:
A. V. Ryabova, Cand. Eng., Associate Prof., “General Chemistry and Technology of Silicates” Dept., E-mail:


Coatings that protect the steel surface from the damaging effects of the environment are used to protect steel pipelines from various kinds of corrosion. The choice of coating material is determined by the specific conditions of construction and operation of pipelines, the durability and cost of materials, tecnology of the coating process, etc. These conditions determine the range of materials used as coatings for steel pipes. Analysis of all the presented protective coatings allowed to identify the most optimal glass composite coatings, which have high corrosion resistance, durability and can protect the internal and external surfaces of pipelines. In the course of previous studies, glass-composite coatings were synthesized to protect steel pipelines: glass enamel for the inner surface and foam glass for the external. The optimal compositions of glass-composite coatings were determined, as well as their technical, operational, and physical-chemical properties. The aim of this work was to study the phase composition and microstructure of the synthesized coatings and to describe the physical-chemical processes that occur during their synthesis. The structure of the contact layer “steel — glass-enamel coating” was studied. It was found that the thickness of the enamel layer is about 0.3 mm, and pores with a diameter of up to 150 μm are present in the enamel structure. The contact layer has a developed structure, which is formed during the interaction of the enamel melt with steel and the partial dissolution of steel in enamel. Chemical analysis of the contact layer is showing the presence of iron oxide, carbon and a small amount of silicon and manganese. The developed foam glass materials of optimal composition were also subjected to microstructural analysis. It was found that the walls of the macropores are penetrated by micropores 20–100 μm in size. The phase composition of the synthesized foam glass materials consisted of 75–77.5% of amorphous glass phase, and the crystalline phase was mainly represented by α-quartz. The use of synthesized silicate materials will increase the reliability and durability of the oil pipeline system, as well as reduce the costs of its operation.

This work was performed at the SRSPU (NPI) with fi nancial support from the Russian Science Foundation under the agreement No. 18-19-00455 “Development of integrated protection technology for pipelines for oil and gas operated in the Russian Far East” (supervisor — Yatsenko E. A.).

keywords Steel pipeline, corrosion protection, silicate materials, vitreous enamel, foam glass, microstructure

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