Title:
FABRICATION OF LARGE ALUMINUM CONTAINER
Document Type and Number:
Japanese Patent JPS5928592
Kind Code:
A
Abstract:
PURPOSE:To form a homogenous oxide film over the total inner surface of a large container, especially, even to the welded part thereof, by a method wherein the large container prepared by subjecting an Al plate to welding processing is filled with an electrolyte and this container is used as an anode while a cathode immersed in the electrolyte is used to supply a current. CONSTITUTION:An Al plate and other necessary members are prepared and an objective large container 1 is fabricated by a known method, for example, by a welding method. In the next step, this container 1 is filled with an electrolyte 2 comprising an aqueous solution pref. containing 3-20% sulfuric acid and an electrode 5 comprising Al is immersed in the electrolyte 2. In this state, the electrode 5 is connected to the negative terminal of a power source while a conductive piece is attached to the container 1 to be connected to the positive terminal thereof and a current is supplied in a ratio of 0.5-20A per the unit area (dm<2>) of the inner surface of the container 1 to form an oxide film to the inner surface of the container 1. During this time, the electrolyte 2 is pref. recirculated to a heat exchanger 4 through an external pump 3 and the temp. thereof is pref. regulated to a freezing point -30 deg.C.
Inventors:
KONISHI TOSHIO
IMAGAWA HIROYUKI
YAMADA HARUHIKO
SHIMADA TERUHISA
IMAGAWA HIROYUKI
YAMADA HARUHIKO
SHIMADA TERUHISA
Application Number:
JP13652782A
Publication Date:
February 15, 1984
Filing Date:
August 05, 1982
Export Citation:
Assignee:
TORAY INDUSTRIES
International Classes:
C25D11/00; C25D11/04; (IPC1-7): C25D11/04
Domestic Patent References:
| JPS5576070A | 1980-06-07 |