Matériaux & Techniques
Volume 79, Number 7-8, 1991
|Page(s)||27 - 33|
|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
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.