METHOD TO DETECT SPEED OF STEEL CORROSION IN LEAD COOLANT Russian patent published in 2015 - IPC C23F11/00 

FIELD: measurement equipment.

SUBSTANCE: method includes definition of oxidized steel corrosion rate for thermodynamic activity of oxygen in lead in the range of 10^-4÷1.0, lead temperature in the range of 450°C ÷ 650°C, average rate of lead in the flow of lead coolant, washing steel surface, in the range of 0.5 m/s ÷ 2.0 m/s, according to the ratio: where W - steel corrosion rate in lead coolant, m/s, k₁ - empirical coefficient, K, T - lead temperature, K, k₂ - empirical coefficient, a_o - thermodynamic activity of oxygen in lead, k₃ - empirical coefficient, 1/cⁿ, τ - time of steel stay in lead in oxidation mode, s, n - extent index, τ_o - time of preliminary steel surface oxidation in lead, s, ρ - steel density, kg/m³, at the same time for steel EP-823 they use k₁=-22,100 K, k₂=-3.97, k₃=4.6·10^-8 1/cⁿ; n=0.42, and for steel EI-852 they use k₁=-16,210 K, k₂=-10.8, k₃=4.2·10^-8 1/cⁿ; n=0.44.

EFFECT: reduced labour intensiveness of corrosion rate detection.

2 cl, 1 dwg, 1 ex