Formation of Mg-Ni Hydrogen Absorption Alloy Film by Molten Salts Electrolysis

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  • YAMAMOTO Hiroaki
    Graduate Student, Graduate School of Engineering, Nagoya University
  • KAWAKAMI Atsushi
    Graduate Student, Graduate School of Engineering, Nagoya University
  • KURODA Kensuke
    Center for Integrated Research in Science and Engineering, Nagoya University
  • ICHINO Ryoichi
    Graduate School of Engineering, Nagoya University
  • OKIDO Masazumi
    Center for Integrated Research in Science and Engineering, Nagoya University

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<p>A Magnesium-Nickel hydrogen absorption alloy, Mg2Ni, was produced as a film by molten salts electrolysis and diffusion process. Magnesium was electrodeposited on a nickel substrate from a 25 mol % NaCl - 5 mol % KC1 -70 mol % CaCl2 mixture as a supporting electrolyte, and additionally 10 mol % MgCl2 with respect to the supporting electrolyte as magnesium-ion source. The electrodeposition was conducted at 873∼1073 K and with cathodic current densities between 0.02∼0.10 A cm−2 for 3.6∼18 ks. After the electrolysis, the specimens were subjected to X-ray diffraction and EPMA line analysis to identify the phase of compounds and to measure the thickness of the film. As a result, only hydrogen absorption alloy films, Mg2Ni, were obtained with 20 µm and 27 µm thickness from electrodeposition with 0.10 A cm−2 for 3.6 ks at 1023 K and with 0.02 A cm−2 for 18 ks at 873 K, respectively. At 1073 K, the intermetallic compound MgNi2 was also detected between the Mg2Ni layer and the nickel substrate. These specimens were subjected to hydrogen absorption tests in 30 mass % KOH solution at 298 K. It was confirmed that these specimens absorbed hydrogen.</p>

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  • Electrochemistry

    Electrochemistry 67 (6), 655-660, 1999-06-05

    公益社団法人　電気化学会

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