Electrolytic eutectoid alloying method for rare-earth-magnesium-nickel-based hydrogen storage alloy

Abstract

The invention belongs to the field of the preparation of rare-earth alloys and particularly relates to an electrolytic eutectoid alloying method for a rare-earth-magnesium-nickel-based hydrogen storage alloy. The electrolytic eutectoid alloying method for the rare-earth-magnesium-nickel-based hydrogen storage alloy, disclosed by the invention, comprises the steps: adopting a circular or square graphite electrolysis tank, and placing an undertake crucible at the bottom of the electrolysis tank; carrying out joint electrochemical precipitation on cathodes RE (Rare-Earth) and Mg (magnesium) in a manner of taking a metallic nickel (Ni) rod as a cathode, taking fluoride fused salts, such as REF3-LiF-MgF2-BaF2, as an electrolyte and taking a mixture of RE2O3 and MgO as a raw material, alloying with nickel which serves as a cathode, so as to obtain an RE-Mg-Ni alloy, and sinking into the undertake crucible, thereby obtaining the rare-earth-magnesium-nickel-based hydrogen storage alloy. The method has the beneficial effects that the problem that magnesium is subjected to volatilization and oxidation during the smelting of the rare-earth-magnesium-nickel-based hydrogen storage alloy is effectively solved, the rare-earth-magnesium-nickel-based hydrogen storage alloy is adjustable and controllable in ingredients and can be obtained stably, the electrolysis work is continuous, the production process is safe, the process flow is short, and the cost is low.

Description

technical field [0001] The invention belongs to the field of rare earth alloy preparation, and in particular relates to an electrolytic eutectoid alloying method for a rare earth magnesium-nickel-based hydrogen storage alloy. Background technique [0002] RE-Mg-Ni series hydrogen storage alloy is a new generation of high-performance rare earth hydrogen storage material developed in recent years. Depending on the composition, its hydrogen storage weight hydrogen storage density is between 1.4-6%, and its comprehensive performance is superior. There are many preparation techniques for RE-Mg-Ni alloys. On the whole, there are mainly high-temperature diffusion sintering techniques, such as CN1271025A, CN1296083A, CN1598018A, CN1900337A; vacuum induction melting techniques, such as CN1397658A, CN102191416A, CN102277508A, CN102286684A; Such as CN1316537A, CN1644737A; vacuum rapid quenching technology, such as CN101624660, CN101626076A; [0003] Due to the high activity and volati...

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Problems solved by technology

[0008] In order to overcome the outstanding problems of volatile and oxidative segregation of Mg in the smelting process, the technical problem to be solved by the present invention is to provide an electrolytic eutectoid alloying method for rare earth magnesium-nickel-based hydrogen storage alloys, which can effectively solve the problem of rare

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