National University of Science and Technology MISIS, Moscow, Russia:

A. G. Rakoch, Dr. Chem., Prof., Dept. of Steel Metallurgy, New Production Technologies and Metal Protection, e-mail: rakoch@mail.ru

O. V. Volkova, Cand. Eng., Senior Lecturer, Dept. of Steel Metallurgy, New Production Technologies and Metal Protection

JSC RIFAR, Gay, Russia:
A. A. Lobach, Cand. Eng., Innovation Director

V. V. Begnarsky, Cand. Eng., Deputy Director for Scientific and Technical Development

Certification Center, Moscow, Russia:
E. P. Monakhova, Cand. Eng., Chief Specialist in Corrosion Protection, e-mail: evmo444@ya.ru

Baikov Institute of Metallurgy and Materials Science, RAS, Moscow, Russia:
M. V. Zhelezny, Junior Researcher

The paper found that, despite the higher corrosion resistance of 08Yu steel compared to other low-carbon steels used to produce heating radiators, for the safe long-term operation of this steel, it is necessary to deoxygenate the alkaline (pH = 9.5) model solution used as a heat carrier both during heating and non-heating periods. It is shown that the processes of corrosion of steel 08Yu in a model solution proceed with the practical absence of inhibition of the anodic process, but with inhibition of the cathodic one. In this case, the overvoltage of the cathode process increases not only due to a decrease in the concentration of dissolved oxygen, but also with the formation of dielectric nanofilms consisting either of iron silicates or containing a layer of these compounds. The intensity of the formation of iron silicates in the films occurs due to the interaction of SiO₃^2– anions due to their presence in the model solution with iron cations formed near the steel surface, with a reduced oxygen concentration to 0.05 mg/l in the solution. In an alkaline model solution, both at room temperature and 90 °C, which has not undergone deoxygenation, intense dissolution of steel 08Yu occurs with the formation of loose corrosion products – goethite (α-FeOOH) or lepidocrocite (γ-FeOOH), which practically do not have adhesion to metal basis.

1. Shahzad K., Sliem M. H., Shakoor R. A., Radwan A. B. et al. Electrochemical and thermodynamic study on the corrosion performance of API X120 steel in 3.5% NaCl solution. Scientific reports. 2020. Vol. 10. No. 1. 4314.
2. Katiyar P. K., Misra S., Mondal K. Corrosion behavior of annealed steels with different carbon contents (0.002, 0.17, 0.43 and 0.7% C) in freely aerated 3.5% NaCl solution. Journal of Materials Engineering and Performance. 2019. Vol. 28. pp. 4041–4052.
3. Suleiman R. K., Kumar A. M., Adesina A. Y., Al-Badour F. A. et al. Hybrid organosilicon-metal oxide composites and their corrosion protection performance for mild steel in 3.5 % NaCl solution. Corrosion Science. 2020. Vol. 169. 108637.
4. Osório W. R., Peixoto L. C., Garcia L. R., Garcia A. Electrochemical corrosion response of a low carbon heat treated steel in a NaCl solution. Materials and Corrosion. 2009. Vol. 60. No. 10. pp. 804–812.
5. Zeng Y., Kang L., Wu Y., Wan S. et al. Melamine modified carbon dots as high effective corrosion inhibitor for Q235 carbon steel in neutral 3.5 wt% NaCl solution. Journal of Molecular Liquids. 2022. Vol. 349. 118108.
6. Tristijanto H., Ilman M. N., Iswanto P. T. Corrosion inhibition of welded of X–52 steel pipelines by sodium molybdate in 3.5% NaCl solution. Egyptian Journal of Petroleum. 2020. Vol. 29. No. 2. pp. 155–162.
7. Rodionova I. G., Amezhnov А. V., Zarkova Е. I., Iremashvili V. I. Improvement of the corrosion resistance of steels intended for operation in sea water. Problemy Chernoy Metallurgii i Materialovedeniya. 2019. No. 3. pp. 59–65.
8. Rodionova I. G., Amezhnov А. V., Zaytsev А. I., Mogutnov B. М., Baklanova О. N. Corrosion resistance of non-alloyed and low-alloyed steels in neutral aqueous media. Moscow : Metallurgizdat, 2021. 388 p.
9. Bates A. J., Bignold G. J., Garbett K., Woolsey I. S. et al. The central electricity generating board single-phase erosion-corrosion research programme. Nuclear Energy. 1986. Vol. 25. pp. 361–370.
10. Tremaine R. P., LeBlanc J. C. The solubility of magnetite and the hydrolysis and oxidation of Fe²⁺ in water to 300 °С. Journal of Solution Chemistry. 1980. Vol. 9. pp. 415–442.
11. Remy F. N., Bouchacourt M. Flow-assisted corrosion: a method to avoid damage. Nuclear Engineering and Design. 1992. Vol. 133. pp. 23–30.
12. Fujiwara K., Domae M., Ohira T., Hisamune K. et al. Electrochemical measurements of carbon steel under high flow rate condition and thermodynamic solubility of iron. Proceedings of the 16^th Pacific Basin Nuclear Conference (Aomori, Japan, Atomic Energy Society of Japan). 2008. 1048 p.
13. Bouvier O., Bouchacourt M., Fruzzetti K. Redox conditions effect on flow accelerated corrosion: influence of hydrazine and oxygen. Proceedings of the International Conference on Water Chemistry of Nuclear Reactor Systems, Avignon, France. April, 2002. No. 117. pp. 22–26.
14. Fujiwara K., Domae M., Yoneda K., Inada F. Model of physico-chemical effect on flow accelerated corrosion in power plant. Corrosion Science. 2011. Vol. 53. pp. 3526–3533.
15. Satoh T., Shao Y., Cook W. G., Lister D. H., Uchida S. Flow-assisted corrosion of carbon steel under neutral water conditions. Corrosion. 2007. Vol. 63. pp. 770–780.
16. Ahmed W. H., Bello M. M., Nakla M. E., Sarkhi A. A., Badr H. M. Experimental investigation of flow accelerated corrosion under two-phase flow conditions. Nuclear Engineering and Design. 2014. Vol. 267. pp. 34–43.
17. Rani H. P., Divya T., Sahaya R. R., Kain V., Barua D. K. CFD study of flow accelerated corrosion in 3D elbows. Annals of Nuclear Energy. 2014. Vol. 69. pp. 344–351.
18. Song G. D., Jeon S. H., Son Y. H., Kim J. G., Hur D. H. Galvanic effect of magnetite on the corrosion behavior of carbon steel in deaerated alkaline solutions under flowing conditions. Corrosion Science. 2018. Vol. 131. pp. 71–80.
19. Tsuda N., Nasu K., Fujimori A., Siratori K. Electronic conduction in oxides. Springer Series in Solid-State Sciences, Vol. 94. Berlin, Heidelberg: Springer, 2000. 365 p.
20. Amezhnov А. V., Zarkova Е. I., Rodionova I. G., Aleksandrova N. М. Investigation of the influence of the structural state and microalloying characteristics on the corrosion resistance of ultralow-carbon and low-carbon steels. Problemy Chernoy Metallurgii i Materialovedeniya. 2020. No. 1. pp. 33–45.
21. Shilo I. А., Shaposhnikov N. G., Mogutnov B. М., Strizhakova Т. I., Rodionova I. G., Chirkina I. N. Kinetics of precipitation of manganese sulfide from 08Yu type austenite steel. Problemy Chernoy Metallurgii i Materialovedeniya. 2009. No. 4. pp. 59–63.
22. Gladchenkova Yu. S., Rodionova I. G., Zaytsev А. I., Koldaev А. V., Shaposhnikov N. G., Dyakonov D. L. Complex phase precipitation and properties of low-carbon steels. Problemy Chernoy Metallurgii i Materialovedeniya. 2016. No. 4. pp. 68–73.
23. Zhuk N. P. Course in the theory of corrosion and protection of metals. Moscow : Metallurgiya, 1976. 472 p.