Frontiers of Chemical Science and Engineering
>> 2021,
Volume 15,
Issue 1
doi:
10.1007/s11705-020-1935-8
RESEARCH ARTICLE
Effects of additive NaI on electrodeposition of Al coatings in AlCl
. National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, Shanghai 200240, China.. The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China.. School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
Received: 2020-04-21
Accepted: 2020-07-13
Available online: 2020-07-13
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Abstract
Effects of NaI as an additive on electrodeposition of Al coatings in AlCl -NaCl-KCl (80-10-10 wt-%) molten salts electrolyte at 150°C were investigated by means of cyclic voltammetry, chronopotentiometry, scanning electron microscopy and X-ray diffraction (XRD). Results reveal that addition of NaI in the electrolyte intensifies cathodic polarization, inhibits growth of Al deposits and increases number density of charged particles. The electrodeposition of Al coatings in the AlCl -NaCl-KCl molten salts electrolyte proceeds via three-dimensional instantaneous nucleation which however exhibits irrelevance with NaI. Galvanostatic deposition results indicate that NaI could facilitate the formation of uniform Al deposits. A compact coating consisting of Al deposits with an average particle size of 3 μm was obtained at a current density of 50 mA∙cm in AlCl -NaCl-KCl molten salts electrolyte with 10 wt-% NaI. XRD analysis confirmed that NaI could contribute to the formation of Al coating with a preferred crystallographic orientation along (220) plane.
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