Electrodeposition of Al–Mg Alloy Powders

Abstract

Aluminum–magnesium alloys can potentially be used as hydrogen storage materials. In order to enhance the kinetics of hydrogenation, it is desirable to have agglomerates of fine powders with very small grain size. Electrodeposition is a viable method to produce pure powders with an ultrafine structure. In this paper we report the effect of magnesium content, electrolyte temperature, and current density on the characteristics of Al–Mg deposits produced galvanostatically using an organometallic-based electrolyte. The magnesium content of the deposits improved with increasing Mg concentration in the electrolyte, temperature, and current density. The results indicate that the morphology of the deposits is significantly affected by the magnesium content. Depending on the composition, the deposits consisted of face-centered cubic -Al(+Mg) and hexagonal close-packed -Mg(+Al) phases.

Evolution of Morphology and Microstructure in Electrodeposited Nanocrystalline Al–Mg Alloy Dendrites

“…At higher compositions two intermetallics namely Al 3 Mg 2 and Al 12 Mg 17 are found in Al-Mg system. The absence of any intermetallics in the present deposits at such high composition values suggests that the deposition rates are so high that the deposition took place in non-equilibrium manner resulting in supersaturated and metastable phases [13].…”

“…This shows that an inverse relationship exists between current density and grain size of the depositing morphologies. Our earlier results suggested that the Mg in the electrolyte [15] and thus in the deposits [13] increases with both current density and deposition time. Consistently, the smooth globules possessed higher amount of Mg (~20 at.% Mg) than feather-like morphology (Figure 2(a)).…”

“…The details of the electrolyte preparation were reported elsewhere [13]. A rotating cylinder cell setup with a Cu rod of diameter 6 mm as cathode rotating at 200 rpm and an annular Mg anode was used for deposition.…”

“…We demonstrated the electrodeposition technique for producing Al-Mg alloy powders in dendritic form using an organometallic-based electrolyte [13] for hydrogen storage application. In this paper, we present the morphological and microstructural characteristics and their evolution during dendritic growth of electrodeposited Al-Mg powders.…”

Investigation of Al-Ni Alloys Deposition during Over-discharge Reaction of Na-NiCl2Battery

“…For this reason, electro-deposition has been studied as an alternative method to form Al alloy successfully. [11][12][13] Although it is well known that Al could be formed in Zebra battery cells, there is no reports treating Al deposition in the cathode current collectors of Zebra battery even without cell failure. Interestingly, Al-Ni alloy codeposition was reported to occur in the NiCl 2 / AlCl 3 /EMImBr (0.03/2/1) solution at 0.3 V higher voltage 14) than that of pure Al deposition.…”