Corrosion Products Electrochemical Behaviour into Molten LiF-NaF: Investigation of Cr(II) System

In this work, a detailed electrochemical study of the molten LiF-NaF-CrF2 system is provided on Ag electrode in the 750 degrees C-900 degrees C temperature range. The first part was dedicated to the electrochemical study, by cyclic and square wave voltammetries, allowing the determination of thermodynamic and physico-chemical data such as CrF2/Cr standard potential, diffusion coefficient, activity coefficient, transfer energy and nucleation overvoltage. The influence of Li2O addition on the electrochemical reduction pathway of dissolved CrF2 on a silver electrode was investigated. The results showed that an increase of Li2O activity in the solution causes CrF2 disproportionation into solid chromium oxide and metallic Cr.

Automated summary

This work provides a detailed electrochemical study of the molten LiF-NaF-CrF2 system on an Ag electrode in the temperature range of 750°C-900°C. The addition of Li2O was found to influence the electrochemical reduction pathway of dissolved CrF2 on the silver electrode.