Yan-peng Dou, Di-yong Tang, Hua-yi Yin, and Di-hua Wang, Electrochemical preparation of the Fe–Ni36 Invar alloy from a mixed oxides precursor in molten carbonates, Int. J. Miner. Metall. Mater., 27(2020), No. 12, pp. 1695-1702. https://doi.org/10.1007/s12613-020-2169-y
Cite this article as:
Yan-peng Dou, Di-yong Tang, Hua-yi Yin, and Di-hua Wang, Electrochemical preparation of the Fe–Ni36 Invar alloy from a mixed oxides precursor in molten carbonates, Int. J. Miner. Metall. Mater., 27(2020), No. 12, pp. 1695-1702. https://doi.org/10.1007/s12613-020-2169-y
Research Article

Electrochemical preparation of the Fe–Ni36 Invar alloy from a mixed oxides precursor in molten carbonates

+ Author Affiliations
  • Corresponding author:

    Di-hua Wang    E-mail: wangdh@whu.edu.cn

  • Received: 31 May 2020Revised: 14 August 2020Accepted: 17 August 2020Available online: 20 August 2020
  • The Fe–Ni36 alloy was prepared via the one-step electrolysis of a mixed oxides precursor in a molten Na2CO3–K2CO3 eutectic melt at 750°C, where porous Fe2O3–NiO pellets served as the cathode and the Ni10Cu11Fe alloy was an inert anode. During the electrolysis, NiO was preferentially electro-reduced to Ni, then Fe2O3 was reduced and simultaneously alloyed with nickel to form the Fe–Ni36 alloy. Different cell voltages were applied to optimize the electrolytic conditions, and a relatively low energy consumption of 2.48 kW·h·kg−1 for production of FeNi36 alloy was achieved under 1.9 V with a high current efficiency of 94.6%. The particle size of the alloy was found to be much smaller than that of the individual metal. This process provides a low-carbon technology for preparing the Fe–Ni36 alloy via molten carbonates electrolysis.

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