Electrodeposition and corrosion characterisation of micro- and nano-crystalline aluminium from AlCl3/1-ethyl-3-methylimidazolium chloride ionic liquid

This study reports on the electrodeposition of Al from AlCl3/1-ethyl-3-methylimidazolium chloride (EMIC) ionic liquid, with the aim at determination of the mechanism applied and correlation of deposition kinetics and coulombic current efficiency with the microstructure and corrosion behaviour of Al...

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Bibliographic Details
Published in:Electrochimica acta 2013-07, Vol.103, p.211-218
Main Authors: Bakkar, Ashraf, Neubert, Volkmar
Format: Article
Language:English
Subjects:
Aluminium
Aluminum
Chlorides
Corrosion
Deposition
Electrodeposition
Ionic liquids
Low carbon steels
Mechanism
Nanocrystalline
Nanocrystals
X-ray diffraction
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Summary:This study reports on the electrodeposition of Al from AlCl3/1-ethyl-3-methylimidazolium chloride (EMIC) ionic liquid, with the aim at determination of the mechanism applied and correlation of deposition kinetics and coulombic current efficiency with the microstructure and corrosion behaviour of Al deposits. Cyclic voltammetry studies were conducted on both platinum and steel substrates with various scanning rates and reversal potentials. Potentiostatic electrodeposition experiments were applied to obtain functional Al layers on low carbon steel substrates and the effect of deposition potential on the deposit morphology and crystal size was investigated using SEM-EDX and XRD. Nano-crystalline Al deposits were obtained on low carbon steel substrates using polarisation potentials more negative to −600mVvsAl, and the Al crystallite size was scaled down to 28nm at −700mVvsAl. Nano-crystalline deposits, with brighter and flatter surfaces, showed higher corrosion resistance in aqueous chloride solutions.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2013.03.198