2042.     LAMBRIS, G.  [Deposition of Carbon in the Electrolysis of Nickel From Solutions.]  Ztschr. Electrochem, vol. 15, 1909, pp. 973-981; Chem. Abs., vol. 4, 1910, p. 866.

        Previous work upon the electrolytic deposition of C is reviewed and the author’s experiments are described in detail.  Various C-containing baths of Ni were used and the deposited Ni and gases analyzed.  The gases in 1 of the experiments were:  CO₂, 6%; hydrocarbons (heavy), 1.2%; hydrocarbons (light), 2.6%; air, 4.8%; H₂, 89.9%; total 99.1%.  These values are about the same for several experiments.  It is shown that the colloidal theory for the deposition of C does not hold good and that C₂H₂ plays a large part in the deposition.  The conclusions given are:  (1) The absorption of C by the Ni is entirely due to a gas reaction.  (2) The gases that will introduce C into the Ni are CO, CO₂, and C₂H₃.  Gases reduced beyond C₂H₂ do not introduce any.  (3) Oxalic acid is partly reduced to C₂H₂ upon Pt and Ni, but not when Cu, Fe, or Sn cathodes are used.  Therefore, C₂H₂ is the only carrier of C to metals in electrolysis.  (4) The C in electrolytic Ni is present in the form of carbide.