氟盐-氧化物体系电解制备Al-Cu-Y合金的电极还原过程研究*

doi:10.11896/j.issn.1005-023X.2017.022.010

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Abstract Al-Cu-Y alloys were prepared in this work by molten salt electrolysis via fluoride-oxide system which was composed of electrolyte (Na3AlF6-AlF3-LiF-MgF2) and oxide (Al₂O₃-CuO-Y₂O₃). Cathodic reduction process of Al₂O₃, CuO and Y₂O₃ were analyzed by cyclic voltammetry. Components and phase composition of alloy samples, which had been prepared by aluminum thermal reduction and molten salt electrolysis, were characterized by scanning electron microscopy and energy dispersive spectroscopy. The results showed that the Al-Cu-Y alloys can be prepared in the AlF3-NaF-5wt%LiF-5wt%MgF2(n(NaF)/n(AlF3)=2.2) eutectic system with mixed oxide (Al₂O₃-CuO-Y₂O₃) through 2 hours, and the conditions of temperature, cell voltage and cathode current density are 1 208 K, 3.0 V and 0.7 A/cm2, respectively. Cu (Ⅱ) ions in carbonaceous electrode surface can be reduced to zero valence directly, and Y(Ⅲ) ions cannot be reduced to zero valence directly, but strengthening phase Al3Y can be formed through electrochemical reduction and alloyed process on the surface of preforming active Al-Cu cathode. Meanwhile, Al2Cu and Al3Y phase enriched at the grain boundaries of aluminum matrix. Al-Cu-Y alloys can also be prepared by aluminum thermal reduction from mixed Al-CuO-Y₂O₃, but content of Cu and Y were difficult to control owing to the enrichments of AlCu and AlY phases at the grain boundaries, and many impurities (O, C) also remained in the alloy.

Key words： fluoride-oxide system molten salt electrolysis Al-Cu-Y alloy cyclic voltammetry cathodic reduction process

Published: 08 May 2018

CLC number:

TF813

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	WANG Xu
	LIAO Chunfa
	JIAO Yunfen
	TANG Hao

Cite this article:

WANG Xu,LIAO Chunfa,JIAO Yunfen, et al. Study on Cathodic Reduction Process During the Preparation of Al-Cu-Y Alloy by Molten Salt Electrolysis via Fluoride-Oxide System[J]. Materials Reports, 2017, 31(22): 50-54.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.022.010 OR http://www.mater-rep.com/EN/Y2017/V31/I22/50

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