Authors & Affiliations
Alekseev V.V., Orlova E.A., Varseev E.V., Torbenkova I.Yu.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
Orlova E.A. – Cand. Sci. (Tech.), Leading Researcher, A.I. Leypunsky Institute for Physics and Power Engineering.
Varseev E.V. – Research engineer, A.I. Leypunsky Institute for Physics and Power Engineering.
Torbenkova I.Yu. – Researcher, A.I. Leypunsky Institute for Physics and Power Engineering.
It is modeled the mass transfer process of steel corrosion products in non -isothermal circuit with lead in case of oxygen introduction into the coolant. The dependence for determining of oxygen source value for a given change of oxygen concentration in lead is obtained. The estimation is made of the threshold of oxygen concentration (activity) in lead, the excess of which does not increase the rate of steel corrosion. It was found that at the threshold of oxygen concentration lead-iron ternary oxides begins to form on the surface of steel (achieved of lead-iron ternary oxides activity equal to unity). The dependence of the maximum rate of steel corrosion on the thickness of the spinel iron-chromium sublayer at temperature of 550°C is obtained, which is a straight line in a logarithmic scale. At the absence in the oxide layer of iron-chromium spinel sublayer corrosion rate reaches an extreme value. A theoretical curve of extreme rate of EP-823 steel corrosion in lead vs temperature is obtained, which is consistent with experimental data. At 550°C value of extreme corrosion rate is 900 mm/year.
lead, coolant, steel, oxygen, magnetite, oxide coating, corrosion, mass transfer, flow rate, temperature
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