Authors & Affiliations
Solomatin A.E., Orlova E.A., Zasorin I.I., Alexeev V.V.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
Solomatin A.E. - Researcher, A.I. Leypunsky Institute for Physics and Power Engineering. Contacts: 1, sq. Bondarenko, Obninsk, Kaluga reg., Russia, 249033, Tel.: (484)399-86-55, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Orlova E.A. – Leading Researcher, Cand. Sci. (Tech.), Associate Professor, A.I. Leypunsky Institute for Physics and Power Engineering.
Zasorin I.I. –Leading Enginear, A.I. Leypunsky Institute for Physics and Power Engineering.
Alexeev V.V. – Chief Researcher, Dr. Sci. (Tech.), A.I. Leypunsky Institute for Physics and Power Engineering.
Abstract
The paper presents the results of experiments on the study of the mechanism of self-healing of mechanical defects of the protective coating in contact with lead in oxygen technology to protect steel from corrosion at the initial stage. Samples of steel 16Cr12WMoSiVNbB were kept in lead with single activity of oxygen at 920 (900) To within 15 hours with the subsequent causing artificial defect and repeated endurance at a temperature of 900 of (940) K within 15 hours It is shown that there are two branches of the interaction of steel with Pb to the formation of a cover with different activation energies. Fixed solid oxide cover thickness 8-12 (sometimes up to 15) ?m on intact surface and 1-8 ?m in artificial defect.
The analysis of elements when curing in lead of the artificial defect caused on a steel surface after preliminary tests in lead is for the first time carried out.
By method of double-pulse laser-atomic emission spectroscopy in the cross section of a sample of steel 16Cr12WMoSiVNbB redistribution of components of steel, symmetric concerning the line of defect is revealed. Element structures formed in the artificial coating defect corresponds to the cover formed on the surface undamaged, but with higher content of Si and Cr. On the basis of the findings data assumed that at the initial stage of corrosion protective barrier function executes the coating based on Si. Thus, the process of self-healing protective coating goes through the formation of chromium – silicon spinel, i.e. the structure of again formed covering possesses bigger stability in lead, than formed on the oxidized surface.
Keywords
steel, lead coolant, artificial defect, anticorrosive protection, laser atomic emission spectroscopy, layer wise quantitative analysis
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, 2016, issue 5, 5:16
