Journal
ELECTROCHIMICA ACTA
Volume 47, Issue 17, Pages 2817-2822Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0013-4686(02)00168-8
Keywords
AlCl3-EtMeImCl room temperature molten salt; Al-La alloy; nucleation; surface morphology; orientation
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The cathodic polarization curve on a tungsten disk electrode was measured in a LaCl3-saturated AICl(3)-EtMeImCl [1-ethyl-3-methylimidazolium chloride] melt (N = 0.667: N is molar fraction of AlCl3) at 298 K. The deposition overpotential of aluminum increases compared with the curve obtained before adding LaCl3. It was found that the nucleation/growth process is instantaneous nucleation from chronoamperometric data. When galvanostatic electrolysis was performed in the LaCl3-saturated melt, the strong ;orientation of (200) for the electrodeposits is observed at low current densities (less than or equal to 7.5 mA cm(-2)). On the other hand, the normalized integrated intensity of XRD for (200) and (220) reflections has similar strength at high current densities ( greater than or equal to 10.0 mA cm(-2)). The electodeposits become denser than those obtained in the original melt. In particular, very smooth surface is obtained in the case of 15.0 mA cm(-2) with stirring the bath. (C) 2002 Elsevier Science Ltd. All rights reserved.
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