Electrodeposition of Aluminum from Alkyl Benzene Electrolytes

Abstract

Aluminum was electrodeposited onto metallic substrates from a number of electrolytes consisting essentially of an AlBr3 solute of commercial purity and technical grade alkylbenzene solvents or solvent mixtures.Bright, fine grained, and adherent aluminum coatings 0.5 mil (.013 mm) thick were obtained at cathode efficiencies of the order of 70-85% and at anode efficiencies approaching 100%. The best electrolytes have been found to be those based upon ethylbenzene and diethylbenzene solvents with toluene as a less expensive diluent.The electrolytes have been found to operate most efficiently and reproducibly at specific conductances between 3.0 and 4.0 x 10 -3 fi -lcm -1.The conductance can be maintained at these levels by the periodic addUion of HBr gas.A cell for studying the polarization behavic.ur of organic-based electrolytes was developed and was used to determine cathode charge transfer overvoltages for the ethylbenzene-toluene (1: 1 volume), AlBr3 (50 wt. %) electrolytes. The charge transfer overvoltage was found to be 40 mV at current densities of 10 mAI cm 2 and the heats of activation for the electrodeposition process were of the order of 4 Kcal/ mole (27 to 67 0 C). EX)Jerimental Tafel plots ingicated that the electrodeposition process takes place in steps of 3 electrons. The ions responsible for the plating of aluminum are thought to be TT ,hydroxy 17 and bromo TT complexes. Name:

AlCl3-dissolved Diglyme as Electrolyte for Room-Temperature Aluminum Electrodeposition

“…Besides, the media range from high temperature molten salts, 3 organic solvents e.g. ethers, 4,5 aromatic hydrocarbons, [6][7][8][9] and dimethylsulfone (DMSO 2 ), [10][11][12][13][14][15] and ionic liquids (ILs). [16][17][18][19][20][21] Although the high temperature baths have mainly been used for industrial Al electrorefining, medium-low and/or room temperature (RT) baths are anticipated as promising Al electroplating and/or Al battery electrolytes.…”

The Effects of Heat Treatment on the Electrochemical Properties and Corrosion of Aluminium Alloy AA8011 in an Aqueous Acid Media

“…Aluminium also has very low density, high thermal and electrical conductivities, possesses satisfactory mechanical and relatively good corrosion resistance [2][3][4][5][6][7]. Due to these excellent properties, the metal and its alloys have versatile applications in variety of domestic and industrial arena.…”

Pitting corrosion of Al and Al–Cu alloys by ClO4− ions in neutral sulphate solutions

“…Aluminium is an important material for use in many applications, such as for automobiles, aviation, household appliances, containers, and electronic devices [1][2][3], owing to its many favourable characteristics including its good electrical and thermal conductivities, low density, high ductility, and good corrosion resistance. The corrosion resistance of aluminium arises from its ability to form a natural oxide film on its surface in a wide variety of media [4][5][6][7][8][9][10][11][12].…”