EDN: XVJKHA
Authors & Affiliations
Niyazov S.-A.S., Ivanov K.D., Osipov A.A.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
Niyazov S.-A.S. – Senior Researcher. Contacts: 1, pl. Bondarenko, Obninsk, Kaluga region, Russia, 249033. Tel.: +7 (484) 399-44-40; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..
Ivanov K.D. – Leading Researcher, Dr. Sci. (Tech.).
Osipov A.A. – Senior Researcher, Cand. Sci. (Tech.).
Abstract
The trends and main approaches in modeling the oxidation processes of structural steels in heavy liquid metal heat carriers are considered.
It is shown that the current stage is characterized by a transition from describing the oxidative process in the form of the simplest forms of a kinetic equation characterizing the change in the total thickness of the oxide film to a more detailed description of the process in the form of a system of several equations.
This model is more in line with the current state of experimental research methods, which allow not only to determine the total thickness of oxide films, but also to quantitatively characterize the thinner structure of oxide films and adjacent layers of steel.
Unlike previous models, it has a number of advantages:
– it explicitly contains a parameter characterizing the intensity of the decrease in the thickness of the steel matrix – the main indicator of the corrosion resistance of steel;
– describes in more detail the nature of the change in the total thickness of the oxide layer over time as a superposition of processes occurring at its inner and outer boundaries;
– contains parameters characterizing the composition of steel and the composition of oxide films;
– it allows us to separate the processes of diffusive release of steel components into the heat carrier and the processes of dissociation of the outer oxide layer.
The analysis of the main directions of improvement of the model is carried out. Using specific examples of consideration of a number of features of the oxidative process, the high potential for its further development has been demonstrated.
Keywords
heavy liquid metal coolant, oxygen, oxidation of steels, structural steel, partial pressure, temperature, oxide film, diffusion coefficient, oxidation model, oxygen activity, steel matrix
Article Text (PDF, in Russian)
References
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UDC 621.039.534
Problems of Atomic Science and Technology. Series: Nuclear and Reactor Constants, 2024, no. 1, 1:13
