Abstract
Electrodeposition of iron-tungsten alloys from aqueous ammoniacal alkaline tartrate electrolytes is studied by means of electron diffraction of cathode deposits and chemical analysis of the solution sorbed on them. In resemblance to the adsorption of irregular binany system, the metal component of lower concentration in bulk electrolyte is preferentially adsorbed at non-polarized electrode. This paper describes that this adsorption is important in studying induced codeposition. The electrodeposition of crystalline Fe3W having a non-equilibrium superlattices of DO19 type was found. A geometric requirement for the formation of these crystals was presented. The effect of codeposition of hydrogen on inhibition of this requirement was shown, which accounts for the observed structural transition of alloys prepared under different conditions. The stoichiometry present in the cathode deposits supports the correlation previously proposed between metal composition of electrolyte in the bulk and that at the cathode surface. Qualitative description can be given of the alloy composition using the values of metal composition of ions at the cathode surface and certain reluctance of tungsten in codeposition. This description will be in better agreement with the experimental results on the assumtion that the electrodeposition of tungsten is catalyzed by multiplets of iron atoms deposited in particular geometric structure.
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