Galvano‐Aluminium und seine anodische Oxidation Galvano‐Al‐Eloxal‐Schichten — eine neue Oberfläche

The Electrodeposition of Aluminum from Aromatic Hydrocarbon: I . Composition of Baths and the Effect of Additives

“…Thus, if the current density is too high and/or stirring insufficient, a deficiency of A12Br6 molecules may develop in the diffusion layer causing codeposition of the alkali bromide. Equation [2] will be followed, for the same reasons, by the chemical step 7Br-+ 7A12Br6 ~ 7A12Br7- [5] Combining Eq. [2] and [5] gives the same over-all reaction, represented by Eq.…”

“…Equation [2] will be followed, for the same reasons, by the chemical step 7Br-+ 7A12Br6 ~ 7A12Br7- [5] Combining Eq. [2] and [5] gives the same over-all reaction, represented by Eq. [4].…”

“…Better results were generally observed in the presence of iodides than with bromides. 5 The baths tended to be unstable and were found to deteriorate after a few weeks of operation.…”

“…This bath has not been adopted on a wide industrial scale because of its hazardous nature and the high cost of the bath components. Two other baths, one based on LiA1H4 and A1C13 in tetrahydrofurane (3,4), the other on molten alkyl aluminium compounds (5), are presently under investigation on pilot plant scale. Aromatic hydrocarbons represent a unique class of solvents of great interest for electrochemical research and technology.…”