Abstract
New methods are adopted for the deposition of highly pure Bi in a large yield from acidic solutions. The deposition of the metal is carried out from the metal salt solution of p H = 0.6 in the presence of a complexing agent at a current density of 0.05-2.0 A /dm exp 2 . Atomic absorption spectroscopic X-ray and chemical analysis indicate that the purity of bismuth is 99.9% or better. The baths arranged according to the greater yield of bismuth are a follows: 8-hydroxyquinoline > acetone > dimethylformamide > ethanolamine > glycerol > glycine > thiourea = ethyl alcohol = chloride = methyl alcohol = hydroxylamine > fluoride > thiosulphate > dimethylsulphoxide > iodide > thiocyanate > oxalate. A mechanism of the formation of bismuth has been proposed and tested. 17 ref.--AA