Журналы →  CIS Iron and Steel Review →  2021 →  №1 →  Назад

Coatings and Surface Treatment
Название Protection of internal weld using a silicate coating
DOI 10.17580/cisisr.2021.01.12
Автор E. A. Yatsenko, A. V. Ryabova, B. M. Goltsman, V. A. Smoliy
Информация об авторе

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

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


The main disadvantage of steel pipes and pipeline parts is their sensitivity to corrosion, which leads to a huge waste of metal and reduces the pipeline service life. In the past 15 years, the oil and gas industry has seen a drastic increase in the production of internally coated pipes and pipes made from corrosion-resistant materials. Therefore, their connection must have the same strength, pressure tightness and corrosion resistance as the material of a main pipe. The need to protect the weld is due to the weld and the connected area is the most vulnerable point in the structure. Therefore, the purpose of this work is to develop a technology for enameling the steel pipeline weld with an internal vitreous silicate enamel coating. The components were weighed, mixed and melted. The resulting frit is an X-ray amorphous glass phase. On the basis of the obtained frit, enamel slurries of the required fineness and composition were prepared and tested for the main rheological properties: density; covering ability (amount of slurry retained on a metal product surface); fineness of grinding (degree of frit grinding in slurry suspension); sedimentation stability (resistance of system particles to settling). Slurry was applied to the pretreated steel samples by pouring method. Then the samples were dried for 7-10 minutes at a temperature of 70-90 °C. Fastening firing was carried out in an electric furnace in the temperature range of 750-950 °C for 5 minutes. The quality of the weld and the presence of defects were analyzed after cooling. The optimal composition was chosen. It is characterized by the following advantages: complete melting of the enamel; absence of “copper heads”; absence of bubble craters, as well as small bubbles in the enamel volume; absence of burnouts. Further, the main technical and operational properties of the protective coating for the pipe weld were investigated: chemical resistance to the acid and alkali solutions; “coating – metal” adhesion strength; wear resistance (abrasion resistance). The results obtained demonstrate high protection rates of the synthesized coating, its high durability and reliability.

The work was supported by the Russian Science Foundation, Project # 18-19-00455 “Development of integrated protection technology for oil and gas pipelines, operated in the Far East of Russia” in the framework of the 2018 competition “Conducting fundamental scientific research and exploratory scientific research by individual scientific groups”.

Ключевые слова Weld, silicate coating, vitreous enamel, frit, assembly paste, corrosion protection, coating defects
Библиографический список

1. Zaretskaya M. I. Devices of control systems for coating the inner surface of pipes: thesis ... cand. techn. sci. Samara. Samara State Aerospace University named after S. P. Korolev, 2013. 163 p.
2. Rossi S., Fedel M., Deflorian F., Parziani N. Abrasion and chemical resistance of composite vitreous enamel coatings with hard particles. Surface and Interface Analysis. 2016. Vol. 48 (8). pp. 827–837.
3. Frolenkov K. Y., Tsymai D. V. The effect of structural and energy parameters of glassy melts on the protective performance of coatings made of these glassy melts. Protection of Metals and Physical Chemistry of Surfaces. 2015. Vol. 51 (5). pp. 835–841.
4. Yatsenko E. A., Goltsman B. M., Ryabova A. V., Smoliy V. A., Klimova L. V. Integrated protection of pipelines using silicate materials. International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM. 2019. No. 19 (5.2). pp. 507–514.
5. Kochetov D. M., Shapurov V. S. Corrosion of oil production equipment and problems of industrial safety. Neftedobycha. 2016. No. 4. pp. 22–24.
6. Revie R. W., Uhlig H. H. Corrosion and Corrosion Control: An Introduction to Corrosion Science and Engineering: Fourth Edition. Hoboken New Jersey: John Wiley & Sons, Inc. 2008. 490 p.
7. Wang J., Yuan Y., Chi Z., Zhang G. High-temperature sulfur corrosion behavior of h-BN-based ceramic coating prepared by slurry method. Materials Chemistry and Physics. 2018. Vol. 206. pp. 186–192.
8. Novikov S. V., Rodomakin A. N., Gumerov K. M. Problems of protection of welded joints of pipelines with coating and methods of their solution. Problema sbora, podgotovki i transporta nefti i nefteproduktov. 2009. No. 1 (75). pp. 62–67.
9. Mezinskis G., Pavlovska I., Malnieks K. et al. Sol-gel coated enamel for steel: 250 days of continuous high-temperature stability. Ceramics International. 2017. Vol. 43 (3). pp. 2974–2980.
10. Wang J., Yuan Y., Chi Z., Zhang G. Development and application of anti-fouling ceramic coating for high-sodium coal-fired boilers. Journal of the Energy Institute. 2018. Vol. 91. Is. 6. pp. 962–969.
11. 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.
12. Petzold A., Peschman G. Enamel and enameling. Moscow: Metallurgiya. 1990. 398 p.
13. Yatsenko E. A., Ryabova A. V., Goltsman B. M. Development of fiber-glass composite coatings for protection of steel oil pipelines from internal and external corrosion. Chernye Metally. 2019. No. 12. pp. 46–51.
14. Enameling of metal products. Edited by Vargin V. V. Leningrad: «Mashinostroyeniye». 1972. 496 p.
15. Tkachev A. G., Kushnarev A. S., Kozyarskiy A. Ya. Technology of enamel and protective coatings: tutorial. Novocherkassk: Novocherkassk State Technical University. 1993. 107 p.
16. Yatsenko E. A., Goltsman B. M., Ryabova A. V. The study of the microstructure of glass composite coatings to protect steel pipelines against internal and external corrosion. Chernye Metally. 2020. No. 4. pp. 50–55.

Полный текст статьи Protection of internal weld using a silicate coating