Nickel and Nickel alloys electrochemistry in cryolite-alumina melts

D. A. Simakov, E. V. Antipov, M. I. Borzenko, S. Yu Vassiliev, Yu A. Velikodny, V. M. Denisov, V. V. Ivanov, S. M. Kazakov, Z. V. Kuzminova, A. Yu Filatov, G. A. Tsirlina, V. I. Shtanov

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

9 Citations (Scopus)

Abstract

Voltammetric data and galvanostatic potential transients are compared for a wide range of Ni-containing alloys in cryolite melts (CR 1.8, 2.3 and 2.7) with 1 - 8 wt.% alumina. The specific features of alloys depend cruciaUy on the nickel content. For 40 - 75 wt.% Ni alloyed with Fe, Cu and Al two general types of anode degradation are (1) low resistance of solid products and a tendency to internal corrosion resulting in formation of a porous metal layer; (2) high resistance of solid products with pronounced suppression of oxygen evolution and appearance of rather high ohmic drop. The nature of fluorides, oxides and spinels responsible for both types of behavior is reported on the basis of XRD data, and two major formation mechanisms of these products are discussed in the context of predicting the most prospective combinations of alloy and melt compositions for electrolysis with low-consumption metallic anodes.

Original languageEnglish
Title of host publicationLight Metals 2007 - Proceedings of the Technical Sessions presented by the TMS Aluminum Committee at the TMS 2007 Annual Meeting and Exhibition
Pages489-493
Number of pages5
Publication statusPublished - 2007
Externally publishedYes
EventTMS 2007 Annual Meeting and Exhibition - Orlando, FL, United States
Duration: 25 Feb 20071 Mar 2007

Publication series

NameTMS Light Metals
ISSN (Print)0147-0809

Conference

ConferenceTMS 2007 Annual Meeting and Exhibition
Country/TerritoryUnited States
CityOrlando, FL
Period25/02/071/03/07

Keywords

  • Degradation mechanism
  • Metals
  • Nickel alloys
  • Oxygen-evolving anodes

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