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.