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: e_yatsenko@mail.ru
B. M. Goltsman, Cand. Eng., Associate Prof., “General Chemistry and Technology of Silicates” Dept., E-mail: boriuspost@gmail.com
A. V. Ryabova, Cand. Eng., Associate Prof., “General Chemistry and Technology of Silicates” Dept., E-mail: annet20002006@yandex.ru

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.).

1. Revie R. W., Uhlig H. H. Corrosion and Corrosion Control: An Introduction to Corrosion Science and Engineering, Fourth Edition. John Wiley & Sons, Inc., Hoboken New Jersey. 2008. 490 p.
2. Kazak К. V. Our goal is reliability. Innovatsii. 2009. No. 7. pp. 28–31.
3. Mezinskis G., Pavlovska I., Malnieks K., Bidermanis L., Onufrijevs P. et al. Sol-gel coated enamel for steel: 250 days of continuous high-temperature stability. Ceramics International. 2017. Vol. 43, Iss. 3. pp. 2974–2980.
4. Kim M. T., Chang S. Y., Won J. B., Park H. W. Effect of hot isostatic pressing on the microstructure and mechanical properties of vitreous enamel coatings on low carbon steel. Surface and Coatings Technology. 2006. Vol. 201, Iss. 6. pp. 3281–3288.
5. Rossi S., Zanella C., Sommerhuber R. Influence of mill additives on vitreous enamel properties. Materials & Design. 2014. Vol. 55. pp. 880–887.
6. Kovtunov А. I., Alekseev N. S., Plakhotny D. I., Tanasov О. V. Welding of pipes with silicate-enamel coating. Vektor nauki Tolyattinskogo gosudarstvennogo universiteta. 2015. No. 3-1 (33-1). pp. 60–67.
7. Enamel and protective coating technology: tutorial. Edited by L. L. Bra gina, А. P. Zubekhina. Kharkov: NTU “KhPI”; Novocherkassk: YuRGTU (NPI), 2003. 484 p.
8. Zhakipbaev B. Е., Esimov B. О., Bessmertnyi V. S. Obtaining foam glass based on siliceous rocks of the South Kazakhstan region of the Republic of Kazakhstan. Vestnik Belgorodskogo gosudarstvennogo tekhnologicheskogo universiteta imeni V. G. Shukhova. 2011. No. 2. pp. 43–46.
9. Zhimalov A. A., Bondareva L. N., Igitkhanyan Yu. G., Ivashchenko Yu. G. Use of Amorphous Siliceous Rocks — Opokas to Obtain Foam Glass with Low Foaming Temperature. Glass and Ceramics. 2017. Vol. 74, Iss. 1-2. pp. 13–15.
10. Manevich V. E., Subbotin R. K., Nikiforov E. A., Senik N. A., Meshkov A. V. Diatomite — siliceous material for the glass industry. Glass and Ceramics. 2012. Vol. 69, Iss. 5-6. pp. 168–172.
11. Kazmina O. V., Vereshchagin V. I. Physicochemical modeling of composition of foam glass-crystal materials. Glass Physics and Chemistry. 2015. Vol. 41, Iss. 1. pp. 122–126.
12. Demidovich B. К. Foam glass. Minsk: Nauka i tekhnika, 1975. 248 p.
13. Barcova K., Mashlan M., Zboril R., Filip J., Podjuklova J. et al. Phase composition of steel–enamel interfaces: Effects of chemical pretreatment. Surface and Coatings Technology. 2006. Vol. 201, Iss. 3-4. pp. 1836–1844.
14. Yatsenko E. A., Goltsman B. M., Ryabova A. V., Smoliy V. A. Peculiarities of the use of siliceous raw materials of the Russian Far East in the integrated pipeline protection. MATEC Web of Conferences. 2018. Vol. 242, Iss. 8. 01016.
15. Yatsenko E. A., Goltsman B. M., Smolii V. A., Goltsman N. S., Yatsenko L. A. Study on the Possibility of Applying Organic Compounds as Pore-Forming Agents for the Synthesis of Foam Glass. Glass Physics and Chemistry. 2019. Vol. 45. pp. 138–142.
16. Liu H. H., Shueh Y., Yang F. S., Shen P. Microstructure of the Enamel-Steel Interface: Cross-Sectional TEM and Metallographic Studies. Materials Science Engineering A. 1992. Vol. 149, Iss. 2. pp. 217–224.
17. Yang X., Jha A., Brydson R., Cochrane R. C. An Analysis of the Microstructure and Interfacial Chemistry of Steel-Enamel Interface. Thin Solid Films. 2003. Vol. 443, Iss. 1-2. pp. 33–45.