Method for Eliminating Solution-level Attack on Cathodes During Electrolysis.
U S Pat 4 104 132 1978 Aug; :
The title invention relates to the attack of a cathode by oxygen in the winning of a metal such as zinc. The essence of this invention is the placing of a barrier between the anode and the cathode. Thus, a znso4 solution was made up by dissolving zno in h2so4 (zn2+ 65 and h2so4 200 g/l). This solution was placed in a 4-l cell containing a pbo2-coated ti anode and a rolled zn cathode. A current density of 50 a/ft2 was used at 35 deg-45 deg c for 24 h. Before electrolysis, plexiglas strips were placed between the anode and cathode, extending across the width of the cell and being approximately 1 cm above and approximately 1 cm below the level of the solution. After 24 h there was no attack on the zn cathode at the solution level.
U.S. Pat. 4,104,132; Aug. 1, 1978; Chem. Abstr. 89:33,290K