Anode for producing electrolytic manganese dioxide

Details Anode for producing electrolytic manganese dioxide Anode for producing electrolytic manganese dioxide

1977-05-18

1979-02-20

Edmundson, F. C.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204 82, 204 96, C25B 1110, C25B 1102, C25B 130

Patent

active

041406176

ABSTRACT:
The proposed anode for producing electrolytic manganese dioxide is made of titanium, and its surface is provided with a coating to prevent passivation of the anode. On the anode surface there are provided hollows whose total surface area is not less than 10 percent of that of the anode. Said coating is arranged in these hollows and comprises two layers. The first layer is of a metal selected from the platinum family; it may also be of ruthenium dioxide or platinum oxide and has a thickness of 0.8 to 5 mu; it may also be of lead dioxide and in that case has a thickness of 0.1 to 1 mm. The second layer is of manganese dioxide and has a thickness of 1 to 2 mm.
The proposed method for manufacturing the above anode used to produce electrolytic manganese dioxide comprises the following steps. The surface of an anode of titanium is provided with hollows whose total surface area is not less than 10 percent of that of the anode. The hollows are then provided with a coating which is intended to prevent passivation of the anode and is composed of two layers. The first, inner, layer of said coating is of a metal selected from the platinum family, ruthenium dioxide or platinum oxide and has a thickness of 0.8 to 5 mu. It may also be of lead dioxide and in that case has a thickness of 0.1 to 1 mm. The second, outer, layer of said coating is of manganese dioxide and has a thickness of 1 to 2 mm, which is produced from an aqueous solution of manganese sulphate by electrodeposition which is carried out during 20 to 100 hours at an anode current density of 5 to 100 A/m.sup.2.

REFERENCES:
patent: 2929769 (1960-03-01), Newell et al.
patent: 2979553 (1961-04-01), McCullum
patent: 3313721 (1967-04-01), Teel
patent: 3616302 (1971-10-01), Osawa et al.
patent: 4051000 (1977-09-01), Gendron et al.
Kokhnov et al., Translated from Elektrokhimiya, vol. 9, No. 1, pp. 30-33, Jan. 1973.

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