High breakdown voltage electrodes for bromide containing...

Details High breakdown voltage electrodes for bromide containing... High breakdown voltage electrodes for bromide containing...

C - Chemistry, Metallurgy

25

B

204/78.1

C25B 1/24 (2006.01)

Patent

CA 1096811

ABSTRACT OF THE DISCLOSURE In a method and apparatus for electrolyzing an aqueous bromide containing electrolyte to form bromine by passing an electrolysis current through said electrolyte between a cathode and an anode comprising a valve- metal base which is exposed to the electrolyte over at least part of its surface, the improvement comprising maintaining a breakdown voltage at the valve metal base of the anode in excess of 2 volts (NHE) which may be effected, for example, by using a base consisting of a titanium alloy containing up to 10% by weight of at least one member of the group consisting of vanadium, zinc, hafnium, tantalum and niobium or by using a tantalum base or by the addition to the elec- trolyte of soluble salts of at least one metal of groups IIA, IIIA, IVA, VA, VB, VIIB and VIIIB of the Periodic Table in amounts up to 1% by weight or by the addition to the elect- rolyte of sulfate and/or nitrate ions in a range of 10 to 10 g/1.

277210

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