Home Books eBooks Journals References & Proceedings Authors, Editors, Reviewers A-Z Product Index Awards
Advances in Molten Salts

ISSN:
1-56700-142-4 (Print)

Chemical and electrochemical study of chromium in molten equimolar CaCl2-NaCl Mixture at 550°C

A.M. Martinez
Dpto. de Ouimica Analitica, Facultad de Ciencias. Universidad de Valladolid, Prado de la Magdalena s n 47005 Valladolid Spain.

Y. Castrillejo
Dpto. de Ouimica Analitica, Facultad de Ciencias. Universidad de Valladolid, Prado de la Magdalena s/n 47005 Valladolid Spain.

I. Martin
Dpto. de Ouimica Analitica, Facultad de Ciencias. Universidad de Valladolid, Prado de la Magdalena s/n 47005 Valladolid Spain.

E. Barrado
Dpto. de Ouimica Analitica, Facultad de Ciencias. Universidad de Valladolid, Prado de la Magdalena s/n 47005 Valladolid Spain.

G. M. Haarberg
Departament of Electrochemistry. Norwegian University of Science and Technology.Trondheim. 7034 Norway

Abstract

The chemical and electrochemical properties of solutions of chromium chlorides in the fused CaCl2-NaCl equimolar mixture were studied at 550°C using different working electrodes. We determined the stability range of the various oxidation states of chromium and calculated the standard potentials of the Cr(III)/Cr(II) and Cr(II)/Cr(0) redox couples, the solubility products of the chromium oxides, the kinetic parameters of the electrochemical systems at the different electrodes and the diffusion coefficients of the electroactive species. The results have been compared to those obtained in molten LiCl-KCl eutectic at 450°C.