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 Ni3 Nb 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 .
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