Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1998-09-14
2000-04-18
Bell, Bruce F.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204286, 204290F, 204206, 204213, C25B 1100
Patent
active
060511184
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an electrolytic composite electrode provided with an electrolytic insoluble anode used for tinning or galvanizing a steel plate requiring a large current, or manufacturing a copper foil by the electroplating method.
BACKGROUND ART
In recent years, a plating current has increased as a plating rate has increased in the electroplating field. A high plating current density of 30 to 250 A/dm.sup.2 is used for galvanizing or tinning a steel plate or manufacturing a metallic foil by the electroplating method. Moreover, it is requested to plate a banded material having a large width of 500 to 2,000 mm or obtain a metallic foil through electroplating. Therefore, to plate the large material, it is unavoidable that an insoluble electrode to be used increases in size. Moreover, in the case of manufacturing plated products or metallic foils, it is requested to further improve the quality of these products and keep the fluctuation of the inter-electrode distance between an anode and a cathode at 5% or less.
Therefore, it is attempted to use a composite electrode substrate obtained by using a conductive material such as copper, iron, aluminum, lead, or tin as a core and covering the core with a titanium plate for a large insoluble electrode to be operated at the above large current from the viewpoints of conductivity and profitability.
However, the above large composite electrode substrate has a considerably large weight and it is difficult to handle it when machining it. Moreover, the following problems occur when covering an electrode catalyst.
(a) A large heavy electrode substrate has a large heat capacity. Particularly, in the case of an insoluble anode manufactured by repeating heat treatment at a high temperature of 350 to 700.degree. C. and thereby covering an electrode catalyst such as a platinum-group metal or its oxide, the energy loss under heat treatment increases and moreover, it takes a lot of time to raise or lower the temperature.
(b) In the case of a composite electrode substrate, when covering an electrode catalyst, a joint between different types of metals is easily distorted or damaged.
(c) To cover an electrode catalyst, precision machining of the several-micron order is requested. Therefore, a considerably-high equipment cost is required to machine a large electrode substrate.
The official gazette of Japanese Utility Model Publication No. Hei 3-42043 discloses a device for solving the above problem. According to the device, it is possible to set or remove a second electrode substrate by using a composite electrode substrate as a first electrode substrate and supporting the second electrode made of a titanium plate covered with an electrode catalyst manufactured separately from the first electrode substrate to the first electrode substrate with a bolt.
Moreover, the official gazette of Japanese Patent Publication No. Hei 6-47758 discloses an art for deflecting a removable anode tie plate (second electrode substrate) by supporting the anode tie plate with a circular-arc electrolytic cell (first electrode substrate) having support means for supporting the anode tie plate in a circular-arc insoluble anode.
However, when an electrode becomes circular-arc, it is difficult to finish the first electrode substrate into a high-accuracy circular arc by the arts disclosed in the official gazettes of Japanese Utility Model Publication No. Hei 3-42043 and Japanese Patent Publication No. Hei 6-47758, differently from the case in which the first electrode substrate uses a plate. Therefore, it is difficult to decrease the fluctuation of the inter-electrode distance between an anode and a cathode even if supporting the second electrode substrate with the first electrode substrate. Moreover, a circular-arc electrode has a problem that fluctuation occurs in inter-electrode distances due to a slight deviation from the rotation axis of a cathode drum to be rotated.
To solve the problems, the official gazette of Japanese Patent Publication No. Hei 6-47758 further disclo
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Arai Yukio
Asaki Tomoyoshi
Mori Toshimi
Takayasu Teruki
Bell Bruce F.
Ishifuku Metal Industry Co., Ltd.
Showa Co., Ltd.
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