Electrochemistry of Ni(II) and the Behavior of Oxide Ions in Chloroaluminate Melts.

Abstract

The electrochemical behavior of Ni(II) has been investigated in chloroaluminate melts between 145 and 210 deg C. Ni(II) is completely soluble in acidic mixtures where the pCl is higher than 5.5 (m/Kg scale). A well defined and behaved reduction wave is observed at 1.2 V vs an Al reference in a NaCl saturated reference compartment. When the pCl is descreased, precipitation of NiCl2 occurs, the result which has been confirmed from electrochemical and x-ray diffraction experiments. The solubility product was found. The result is in disagreement with the precipitation of Ni0 which recently proposed in the literature. As a direct consequence, the acid-base behavior of oxide ions in chloroaluminate has been reinvestigated. Precise titrations of the basic strength of oxide ions have been performed in narrow pC1 ranges. An equilibrium constant of .016/m Kg was found for the general reaction in equilibrium with two orders of magnitude higher than the previously reported value.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1977
Accession Number
ADA043421

Entities

People

  • Bernard Gilbert
  • R. A. Osteryoung

Organizations

  • Colorado State University

Tags

DTIC Thesaurus Topics

  • Anodizing
  • California
  • Chemistry
  • Diffraction
  • Diffusion Coefficient
  • Electrochemical Cells
  • Electrochemistry
  • Electrodes
  • Equations
  • Materials
  • Materials Science
  • Measurement
  • Military Research
  • New York
  • Precipitation
  • X Rays
  • X-Ray Diffraction

Readers

  • Mathematics or Statistics
  • Organic Chemistry
  • Surface Engineering/Surface Coating Technology.