Anodic Dissolution of Tungsten-Zirconium Alloy in Alkaline Electrolyte

This article presents the results of studying the anodic behavior of W–Zr alloy samples with different Zr content in alkaline electrolyte. We examined the relationship between content of alloying ingredient and some parameters of electrochemical process and used potentiodynamic method for measuring volt-ampere curves. The rate of anodic dissolution was shown to increase with growth of zirconium content. In our research we investigated the influence of electrolyte composition on kinetics of W–Zr alloy anodic process and measured anodic curves obtained for 18% Zr samples in the presence of anionic additives of organic and non-organic nature. As a result, we found the differences in stationary potentials and anode-current density. Findings of the research showed that the 18% W–Zr alloy was the most electrochemical active in the presence of fluoride ions in alkaline electrolyte. This fact was proved by the shifts of electrode potentials on polarization curves to negative values and by growth of anodic current maximum.

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