Hydrogen Embrittlement Behavior of Mg-Al Alloy by Cathodic Electrolysis.

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  • KURODA Kensuke
    Center for Integrated Research in Science and Engineering, Nagoya University, Chikusa–ku, Nagoya 464–8603
  • HARA Hideki
    Graduate Student, Graduate School of Engineering, Nagoya University
  • ICHINO Ryoichi
    Graduate School of Engineering, Nagoya University
  • OKIDO Masazumi
    Center for Integrated Research in Science and Engineering, Nagoya University, Chikusa–ku, Nagoya 464–8603

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Other Title
  • カソード電解法を用いた水素によるＭｇ‐Ａｌ合金の劣化挙動
  • カソード電解法を用いた水素によるMg-Al合金の劣化挙動
  • カソード デンカイホウ オ モチイタ スイソ ニ ヨル Mg Al ゴウキン ノ レッカ キョドウ

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Abstract

It is well known that magnesium is capable of absorbing hydrogen and forming its hydride. The Mg-13 mol % Al alloy was picked up to produce a joining materials with a self-decomposition property as a new concept for metal recycling from the view points of the light metal and the low melting point. The hydrogen embrittlement behavior of this alloy was examined by using the cathodic electrolysis. The relation between the embrittlement behavior and the hydriding was investigated. The electrolysis was conducted in neutral, pH 6.0, or alkaline, pH 13.7, aqueous solution from 298 K to 353 K for 172.8 ks at potentials from the rest potential to -3.0 V (vs. Ag/AgCl sat. KCl). The following results were obtained: (i) At the lower potential in both solutions, the more Mg hydride was formed on the surface of the specimen. (ii) Many craters burst by the absorbed hydrogen were detected on the surface at the lower potentials because blisters of gaseous hydrogen were formed there. (iii) The additions of thiourea or gelatin to the neutral solution and of copper to the Mg-Al alloy accelerated the hydrogen embrittlement.

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 115 (1), 59-63, 1999

    The Mining and Materials Processing Institute of Japan

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