ELECTRODES, MAINLY CONTAINING A VALVE METAL BASE OR OTHER ELECTRICALLY CONDUCTIVE MATERIAL, RESISTANT TO CORROSION UNDER CONDITIONS OF ANODS, WHICH, AT AN AMOUNT OF THE PROPERTY, HAVE BEEN AT THE COURSE, AT THE COURT, IN AN AT LEAST ADVANTAGE.

摘要

Novel electrodes consisting essentially of a valve metal base or other electrically conductive material which is corrosion-resistant to the anodic conditions having on at least a portion of its outer surface an electrocatalytic coating of beta -manganese dioxide chemi-deposited by thermal decomposition of an alcoholic solution of manganese nitrate which are useful in electrolysis processes in which oxygen is formed at the anode such as electrowinning of metals from sulfuric acid solution or in the electrolytic production of perchlorates. Also included are electrodes where the beta -manganese dioxide coating is activated by doping with up to 5% by weight of at least one metal of the groups IB, IIB, IVA, VA, VB, VIB, VIIB, and VIII of the Periodic Table excluding the platinum group metals, gold and silver or activated by irradiation of the beta -manganese dioxide coating and/or stabilized by the addition of up to 20% by weight of silicon dioxide, tin dioxide or beta -lead dioxide as a mechanical stabilizer for the coating.