Corrosion resistance of V-4Ti-4Cr alloy in convection flow of eutectic Na-K alloy

Abstract

The corrosion resistance of V-Ti-Cr alloys in contact with a eutectic Na-K melt have been eval uated from experiments on the compatibility of V-4Ti-4Cr alloy specimens with a convection flow of the Na-K eutectic. In the test system made of the same vanadium based alloy, the maximum temperature was 650°C, the temperature drop was 150°C, and the duration of the tests was 500 h. The experiments have shown that, under the conditions of the tests carried out in the Na-K eutectic with an initial concentration of oxy gen of 0.04 wt %, the V-4Ti-4Cr alloy undergoes intense mass transfer. The solid metal absorbs the oxygen impurity from the liquid melt. The observed effects agree with the previously drawn conclusions on the effect of the oxygen impurity on the solubility of vanadium in the Na-K eutectic. Provided that the intensity of the source of the oxygen impurity in the corrosion system is limited, one might expect acceptable corrosion com patibility of the V-4Ti-4Cr alloy with the Na-K eutectic.

An Analysis of the Solute Interactions in Multicomponent Metallic Solution to Study the Liquid Metal Corrosion Mechanisms in Sodium

“…Obviously, simultaneously with the processes of dissolution of solid metals A1 and A2 in liquid metal, the atoms of these metals will be deposited on the surface of solid metals. It is known [5,8] that as a result of these processes, the chemical composition of the surface of both materials is equalized. In the most common case, both dissolved metals form solid solutions during precipitation.…”