Electrodeposition of aluminum from molten AlCl3-NaCl-KCl mixture

Jafarian, M ; Sharif University of Technology | 2006

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  1. Type of Document: Article
  2. DOI: 10.1007/s10800-006-9192-1
  3. Publisher: 2006
  4. Abstract:
  5. Electrochemical deposition of aluminum from basic and acidic molten NaCl-KCl-AlCl3 mixture on a graphite electrode at 140 °C was studied by voltammetry, chronopotentiometry and constant current deposition. The deposition of aluminum was found to proceed via a nucleation/growth mechanism in basic melt, while it was found to be diffusion controlled in acidic melt. The diffusion coefficient calculated for Al2Cl- 7 ions in acidic melt by voltammetry was in agreement with the deductions of voltammetry. The morphology of the aluminum deposits was examined using a metallographic microscope and by SEM. It was shown that, depending on the current density (c.d.) and AlCl3 concentration (acidic or basic melt) different aluminum morphologies were evident but a silver-bright, compact, and very stable metallic form of aluminum deposit was obtained in acidic melt with KI addition as surfactant. © Springer 2006
  6. Keywords:
  7. Aluminum compounds ; Diffusion ; Electrodeposition ; Molten materials ; Sulfur ; Surface active agents ; Chronopotentiometry ; KI ; Molten salt ; Voltammetry ; Aluminum
  8. Source: Journal of Applied Electrochemistry ; Volume 36, Issue 10 , 2006 , Pages 1169-1173 ; 0021891X (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s10800-006-9192-1