PSI - Issue 81

Anatolii Klymenko et al. / Procedia Structural Integrity 81 (2026) 470–477

476

а) Element, Weight % O Ni Pb Spectrum 12 57.9 40.8 1.3 Spectrum 13 - 67.2 32.8 Spectrum 14 53.5 45.6 0.9 Spectrum 15 70.6 2.2 70.6

Element, Weight % O Ni Pb

b)

Spectrum 6 Spectrum 7 Spectrum 8 Spectrum 9

46.2 50.4 50.9 43.3

3.4 5.8

51.9 62.2

5.4 3.9

42.8 33.9

Fig. 7. Precipitation of nickel oxide in the form of crystals on the surface of lead, after exposure of Inconel 601 alloy in molten lead for 1440 hours at 650°C.

4. Conclusions 1. According to the results of corrosion tests, it was found that the dynamics of the corrosion rate of the Inconel 601 alloy is characterized by a tendency to increase the index by about 15 times with an increase in temperature from 450°C to 650°C. At the same time, with an increase in the duration of the tests from 240 to 1440 hours, the corrosion rate decreases by about 11 times at a melt temperature of 450°C, and by about 1.5 times at a melt temperature of 650°C, which is associated with the formation of a protective oxide film. 2. Increasing the duration of the tests has a minor effect on the formation of a layer of corrosion products on the surface of the alloy; the increase in the temperature of the melt from 450 °C to 650 °C has a greater effect. 3. The degradation process of the Inconel 601 alloy at a temperature of 450 °C is characterized by the simultaneous course of oxidation reactions of alloying elements (Cr, Fe, Al) along grain boundaries with dissolved oxygen, as well as partial dissolution of nickel in the lead melt. When the melt temperature increases to 650 °C, the dominant reaction becomes the dissolution reaction