Electroplating of Al on Mg alloy in a dimethyl sulfone–aluminum chloride bath

Abstract

a b s t r a c tElectroplating of Al on a Mg alloy using a dimethyl sulfone-aluminum chloride bath was studied. Although dense and uniform Al films were electrodeposited on the Mg alloy from the bath at 110°C, the adhesion of the Al film was poor when the electrodeposition was carried out directly onto the bare alloy. Subjecting the Mg alloy to zincate pretreatment resulted in Al films with good adhesion. The adhesion strength of the Al films was measured using a pull-off test. The fractured interface was observed with SEM-EDX, which revealed that the Mg alloy substrate reacted with the bath before the electrodeposition of Al started. The reaction products formed on the substrate were detrimental to the adhesion of the electrodeposited Al film. Polarization curves measured for the Al-coated Mg alloy in a 3.5 wt.% NaCl solution at room temperature (25°C) showed that the Al film electrodeposited from the DMSO 2 -AlCl 3 bath can effectively prevent the Mg alloy from rapid corrosion.

Electrochemically active species in aluminum electrodeposition baths of AlCl3/glyme solutions

“…ethers [3,4], aromatic hydrocarbons [5][6][7][8][9], sulfones [10][11][12][13][14][15][16][17][18] and others [19,20]), and ionic liquids [21][22][23][24][25][26][27][28][29], to name only a few. Some of them are applied to improve the corrosion resistance of magnesium alloys and steel [30][31][32][33].…”

Towards Chloride-Free Organic Electrolytes for Rechargeable Aluminum Batteries

“…The development of an organic electrolyte, however, is a challenging task that requires a fundamental understanding of the solute/solvent ion-dipole and coulombic interactions. 32 Tremendous efforts have been dedicated to electrodeposit Al from a plethora of organic systems including AlCl 3 and lithium hydride(LiH) in diethyl ether, 33 AlCl 3 and lithium aluminum hydride (LiAlH 4 ) in tetrahydrofuran (THF) and benzene mixture, 34 AlCl 3 and LiAlH 4 in THF and toluene, 35 AlCl 3 and LiAlH 4 in THF, [36][37][38][39] aluminum tribromide(AlBr 3 ) in aromatic hydrocarbons, 40,41 AlBr 3 in N,N-dimethylaniline, 42 AlBr 3 and potassium bromide (KBr) in ethylbenzene, 43 AlCl 3 in sulfones, [44][45][46][47][48][49] AlCl 3 in glycol ethers (glymes), [50][51][52][53] AlCl 3 in ethylene carbonate, 54 and AlCl 3 in gamma-butyrolactone (GBL). 55 Unfortunately, these electrolytes are inherently corrosive and the prospects of practically implementing Al-ion batteries as electrochemical energy storage devices is contingent upon active chloride-free systems.…”

Towards Chloride-Free Organic Electrolytes for Rechargeable Aluminum Batteries

“…The development of an organic electrolyte, however, is a challenging task that requires a fundamental understanding of the solute/solvent ion-dipole and coulombic interactions. 32 Tremendous efforts have been dedicated to electrodeposit Al from a plethora of organic systems including AlCl 3 and lithium hydride(LiH) in diethyl ether, 33 AlCl 3 and lithium aluminum hydride (LiAlH 4 ) in tetrahydrofuran (THF) and benzene mixture, 34 AlCl 3 and LiAlH 4 in THF and toluene, 35 AlCl 3 and LiAlH 4 in THF, [36][37][38][39] aluminum tribromide(AlBr 3 ) in aromatic hydrocarbons, 40,41 AlBr 3 in N,N-dimethylaniline, 42 AlBr 3 and potassium bromide (KBr) in ethylbenzene, 43 AlCl 3 in sulfones, [44][45][46][47][48][49] AlCl 3 in glycol ethers (glymes), [50][51][52][53] AlCl 3 in ethylene carbonate, 54 and AlCl 3 in gamma-butyrolactone (GBL). 55 Unfortunately, these electrolytes are inherently corrosive and the prospects of practically implementing Al-ion batteries as electrochemical energy storage devices is contingent upon active chloride-free systems.…”