Electrochemical study of the mechanism of formation of the surface alloy of aluminum-niobium in LiCl-KCl eutectic melt

M. Mohamedi, N. Kawaguchi, Y. Sato, T. Yamamura

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

This work aims to describe the reduction mechanism by which niobium-aluminum alloys are formed in LiCl-KCl eutectic melt. The electrochemical reduction of AlCl3 at an inert electrode such as tungsten and at a niobium electrode, and the electroreduction of AlCl3 and Nb3Cl8 simultaneously were investigated by cyclic voltammetry, convolution voltammetry and chronoamperometry. At a tungsten electrode, AlCl3 was reduced to metallic aluminum via a quasi-reversible process involving a three-electron process. At a niobium electrode, AlCl3 showed very complex behaviour: underpotential deposition of aluminum followed by formation of a surface alloy of aluminum-niobium occurring at 540 and 180 mV above the pure aluminum deposition potential, respectively. The electroreduction of AlCl3 and Nb3Cl8, both present in the LiCl-KCl, confirmed these observations. From chronoamperometric measurements it was suggested that the niobium electroactive species is not reduced to the metallic form until the co-deposition of aluminum begins.

Original languageEnglish
Pages (from-to)91-97
Number of pages7
JournalJournal of Alloys and Compounds
Volume287
Issue number1-2
DOIs
Publication statusPublished - 1999 Jun 1

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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