水素化物浴によるアルミニウム電着について

抄録

To study the mechanism of electrodeposition of aluminum from the hydride bath, the present experiment was carried out, and the result was as follows:
1. The most suitable composition for obtaining the best deposition was as follows.
AlCl₃ 2-3M/l LiH 0.5-1.0M/l in ether
D_K=5-40mA/cm² at room temperature
2. The conductivity of the ether solution of AlCl₃, LiH, LiAlH₄, LiCl, NaH or their mixture was measured, and it was found that the conductivity of the solution containing AlCl₃ was greater than others, and NaH decreased the conductivity of AlCl₃ solution, from which it might be concluded that AlCl₃+LiH, LiCl or LiAlH₄ would produce complex ions in ether.
3. The electrodeposition overpotential was measured by the commutator method, and it was found that a Tafel equation held well in the bath from which electrodeposition of aluminum could be obtained, and that the rate-determinant was three electron reactions.
From the above, it was supposed that for obtaining the electrodeposition of aluminum, a complex ion containing Al³⁺ of relatively small stability constant must exist in the bath, and Al³⁺ produced from this complexion would be discharged at the cathode.