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

概要

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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.
1999-01-25