ELECTRODE PROCESS OF COPPER AND NICKEL DEPOSITION ON PRESSED IRON-POWDER ELECTRODES

Both cyclic voltammetry and galvanostatic electrolyses were used for i nvestigating the electrode process of Cu and Ni deposition and dissolu tion on the surface of electrode formed by pressed Fe powder. Mechanic al pretreatment of the powder material by grinding leads in most cases to promotion of the activity of the electrode made of it. Cyclic volt ammetry records show negative shift of the anodic dissolution peak of the Fe electrode material pretreated by grinding prior to electrolysis . The peak currents of Cu deposition and dissolution are at ground ele ctrodes higher than at unground ones. Cathodic current efficiency obse rved in galvanostatic electrolysis of Cu deposition may be considered as uninfluenced by the pretreatment of the electrode Fe powder materia l. The current efficiency of Ni deposition is in general higher than i n the case of Cu deposition and lower at electrodes prepared from mate rial pretreated by grinding when compared with those prepared from unt reated Fe powder material.