| abstract |
An anode coated with magnetite is manufactured by electrodepositing iron on a metallic substrate consisting of titanium, zirconium, tantalum, or niobium and the like in an electrolyte containing ferrous sulfate, dipping said iron deposited substrate into a solution of ammonium ferric oxalate under a reduced pressure, and then heating said treated substrate in an atmosphere of a gaseous mixture of hydrogen and steam. The anode manufactured in this way is quite suitable for the production of chlorine, chlorates, and bromates, and, furthermore, it is also usable for electrolytic oxidation processes in general and as an anode for electro-winning of copper, for electrolysis of sodium sulphate, for cathodic protection, and for electrodialysis. |