Issue |
Matériaux & Techniques
Volume 79, Number 7-8, 1991
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|
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Page(s) | 27 - 33 | |
DOI | https://doi.org/10.1051/mattech/199179070027 | |
Published online | 13 April 2017 |
Comportement à 700°C de métaux et alliages soumis à NbCl5 gazeux*
Corrosion at 700°C of metals and alloys exposed to NbCl5 vapor
Centre d'Études de Chimie Métallurgique, CNRS, Vitry-sur-Seine
Abstract
The electrochemical reduction of NbCl5 performed at 700°C in a molten salt bath for obtaining niobium has shown that all metallic elements present in the cell are corroded. In such conditions the electrolysis produces only a Ni3Nb alloy and never pure metallic niobium. To determine the effect of NbCl5, we have studied the oxidation of metals (M = Ni, Cr, Nb, Fe, Ti) and alloys (NSMC-NS21C-NS22S-NS30-Inconel 600) put in vapors of niobium pentachloride. For the pure metal M this corrosion is limited by the formation of pure or mixed dichloride (M, Nb)Cl2. Nickel and chromium are the most resistant in this atmosphere. The alloys with melai M as the main component show a much more important corrosion than pure metal. More ever the amount of corrosion is always too weak to explain the big production of NiCl2 that appears when a cell is continously feed with NbCl5.
We study now the same metals and alloys put in a molten salt bath having differents concentrations in NbCl5.
© SIRPE 1991
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