抄録
The electrodeposition of aluminum in the solutions of aluminum bromide in cumene-ethylbenzene baths and the addition effects of tetraalkylammonium halides on the cathode current efficiency have been investigated. For promising aluminum deposition, additives had the effectiveness in the following order (CH3)4NI (silver-white)>(CH3)4 NCI (white)-(CH3)4 NBr (white)(C2H5)4 NCI(white)-(C2H5)4NI (white)(C2H5)4NBr (white-gray). The best effective additive as brightener was (CH3)4 NI. Although the additives increased the conductivity of the solutions, the cathode current efficiency decreased. The preferred orientation of the Al deposits was shown in (111) plane by mean of X-ray diffraction analysis. In case of the addition of (CH3)4 NI, the mean lattice constant and grain size of the deposits were found to be 4.04-4.06Å and 280-930Å, respectively. The purity of electrodeposited Al was more than 99.9% by means of emission spectrochemical analysis.
