Reactive Wetting of Metallic Plated Steels by Liquid Sodium

Abstract

Sodium wetting experiments were performed to investigate the reactive wetting of metallic plating materials by liquid sodium at 250 C for the ultrasonic sensor of the under-sodium viewer. SUS304 stainless steel specimens were electrolytically plated with four metallic materials (nickel, palladium, gold, and indium) that have different solubilities in sodium, and the spreading velocity of sodium droplets on the metallic plated specimens was measured. It was confirmed that the spreading velocity increased as the solubility increased, and the constant on the spreading velocity on the plated specimens was unique for the plating materials and was proportional to the logarithm of the solubility of the plating materials. Furthermore, it is considered possible to select plating materials based on solubility from the result of this study.

Ultrasonic Imaging in Hot Liquid Sodium Using a Plate-Type Ultrasonic Waveguide Sensor

“…Previous experiments show that the stainless steel which is used for the waveguide is poorly wetted in Dispersion curves of A 0 mode Lamb waves in SS304 plates with and without a beryllium coating layer. The longitudinal wave velocity in liquid sodium is also indicated stagnant sodium below 400 • C. To achieve a better wetting condition, wetting properties of various materials such as diamond-like carbon, gold, and polished nickel have been investigated [22][23][24]. In the developed waveguide sensor, a micro-polished nickel layer is employed to enhance the sodium wetting capability.…”

Evaluation of Wetting Behaviors of Liquid Sodium on Transition Metals: An Experimental and Molecular Dynamics Simulation Study

“…They proposed the atomic radius ratio as an indicator of the degree of misfit at the atomic scale and then evaluated the wettability of sodium. In addition, M. Kawaguchi et al [18,19] plated SUS304 stainless steel samples with palladium, nickel, indium and gold, and observed an increase in spreading rate with increasing solubility. They defined a constant, α, representing the spreading rate for each plating material, which was proportional to the logarithm of its solubility.…”