JPS63766Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electrolytic coloring device, and more particularly to an electrolytic coloring device for applying electrolytic coloring to aluminum or aluminum alloy (hereinafter collectively referred to as aluminum material).

The inventors of the present invention discovered that when two electrode plates are placed facing each other at a predetermined distance and AC electrolysis is performed in an electrolyte, changes in potential from one electrode plate propagate through the electrolyte at a finite speed. However, when the distance between the electrodes becomes large, the equipotential surface is disturbed by the flow in the electrolyte and thermal vibrations, but if the distance between the electrodes is made sufficiently small, the equipotential surface is not disturbed much and the equipotential surface is sufficiently disturbed. As a result of various experiments, it was shown that coherence is maintained in
Perceived. When this coherent electric field is applied to the alumite film, blue,
I came to know that it is colored in vivid primary colors such as purple.

On the other hand, as a conventionally known electrolytic coloring device, one is already known in which a liquid-permeable insulator such as a silk screen is interposed between an aluminum material and a return electrode plate to press the two together. (Japanese Patent Application Laid-open No. 104692/1983). However, in this case, there was a problem in that gas generated between the aluminum material and the counter electrode plate remained in the insulator during long-term energization, which interfered with the electrolytic treatment.

Based on the above facts, the present inventors came up with the present invention for the purpose of allowing the aluminum material and the return electrode to be closely opposed to each other with a minute distance between them without intervening an insulator. To achieve this, the present invention has a hollow part in the electrolytic cell in which negative pressure is generated by pump suction, and a number of holes are formed on one side of the electrolytic cell to communicate the hollow part with the outside. A flat plate-shaped pedestal, and a counter electrode plate held so as to face parallel to the through-hole forming side of the pedestal at a minute interval are disposed, and a covering made of aluminum material is provided between the pedestal and the counter electrode. It is characterized by a structure in which a colored plate material is interposed and the plate material to be colored is adsorbed and fixed to the pedestal surface by the negative pressure in the hollow part of the pedestal.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An electrolytic coloring apparatus according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

Inside the electrolytic cell indicated by reference numeral 1 in the figure, there are a pair of hanging tools 3, 3 hanging vertically from the lid 2 of the electrolytic cell 1.
A flat pedestal 4 suspended by a pedestal 4 and a support plate 6 made of acrylic resin or the like to which a counter electrode plate 5 made of a graphite plate or the like is fixed and facing parallel to the pedestal 4 are disposed.

The pedestal 4 is made up of two acrylic resin plates 4a, 4.
A space holding frame 4c is interposed between the space holding frames 4c, and a hollow portion 7 surrounded by the space holding frame 4c is formed inside. The hollow part 7 has pipes 8, 8
It is connected to a pump (not shown) via
Negative pressure can be generated in the hollow part 7 by sucking the electrolyte L in the hollow part 7 with a pump. Further, the acrylic resin plate 4a constituting one side of the pedestal 4 is provided with a large number of through holes 9, 9, . . . which communicate the hollow portion 7 with the outside.

Note that the surface of the return electrode plate 5 is mirror-finished. The pedestal 4 and the return electrode plate 5 are held parallel to each other with a small distance d (approximately 2 mm in this embodiment) by mounting bolts 10, 10, . The pedestal 4 is inserted through a hole so that it can be horizontally moved relative to the mounting bolts 10, 10, . . . .

Further, between the pedestal 4 and the counter electrode plate 5, positioning bolts 11, 11... are installed at the peripheral edges on both sides, and by screwing the positioning bolts 11, 11..., the pedestal 4 and the counter electrode are connected. A minute distance d between the plate 5 and the plate 5 is ensured.

Each of the hanging tools 3 has horizontally elongated holes 14, 14 into which support bolts 12, 12 for fixing the pedestal 4 are inserted, and support bolts 13, 13 for fixing the support plate 6. Horizontally long elongated holes 15, 15 to be inserted are formed, and the minute distance d between the pedestal 4 and the return electrode plate 5 corresponds to the positioning bolt 1.
When adjusted by 1, 11..., the support bolt 1
2 and 13 are movable along elongated holes 14 and 15.

Between the pedestal 4 and the counter electrode plate 5, a colored plate 17 made of aluminum and hanging from the opening 16 of the lid 2 is inserted and removably inserted. When the pedestal hollow part 7 becomes negative pressure due to pump suction, the plate material 17 to be colored is heated to the pedestal 4 surface by the negative pressure transmitted to the back surface of the plate material 17 to be colored through the through holes 9, 9... Fixed by suction. By doing so, even if the plate material 17 to be colored is thin, the flatness of the surface of the plate material 17 to be colored can be ensured by adsorption to the pedestal 4 surface.

Reference numeral 18 in the drawings is a jig made of a conductive material that suspends the plate material 17 to be colored, and the plate material 17 to be colored can be inserted into and removed from the electrolytic cell 1 by means of the jig 18.

Next, the operation of the illustrated electrolytic coloring device will be described.

In the electrolytic cell 1, an electrolytic solution containing a metal salt, for example, 50 g/l of nickel sulfate (hexahydrate) and 50 g/l of boric acid.
Plate material 1 to be colored after anodizing treatment, containing an aqueous solution and suspended by a jig 18 between a pedestal 4 and a counter electrode plate 5
7, the electrolyte in the hollow part 7 of the base is sucked by a pump to generate negative pressure. Then,
The plate material 17 to be colored is suctioned and fixed to the surface of the pedestal 4 by the negative pressure. Thereafter, when the plate material 17 to be colored and the counter electrode plate 5 are connected to an AC power source (not shown) and AC electrolysis is performed, the surface of the plate material 17 to be colored is colored in primary colors ranging from purple to reddish brown. A colored film is obtained. After the AC electrolysis is completed, the connection to the AC power source is cut off and the suction by the pump is stopped, so that the plate material 17 to be colored can be easily separated from the pedestal 4 and taken out of the electrolytic cell 1 using the jig 18. It becomes possible.

The color tone of the electrolytically colored film obtained using this device is supported by the current density and the current application time, and as a general tendency, when current is applied for a short time at a high current density, it shows a blue or purple color tone, When energized for a long time at low current density, it exhibits a reddish color tone.

Further, the distance between the plate material 17 to be colored and the return electrode plate 5 can be adjusted using the positioning bolts 11, 11, etc., but the allowable limit is 5 mm or less, and if it exceeds this, the distance between the plate material 17 to be colored and the return electrode plate 5 can be adjusted. The coherence of the electric field reaching the surface of the colored plate material 17 is impaired,
The desired primary color colored film cannot be obtained.

Next, the effects of the electrolytic coloring device of the present invention will be described.

According to the present invention, the pedestal 4 and the counter electrode plate 5 are held in the electrolytic cell 1 so as to face each other in parallel with a minute interval d, and the negative pressure formed in the hollow part 7 of the pedestal 4 causes the pedestal to Since the plate material 17 to be colored made of aluminum interposed between the plate material 17 and the counter electrode plate 5 is suctioned and fixed to the surface of the pedestal 4, the interval between the plate material 17 to be colored and the counter electrode plate 5 can be precisely and reliably fixed. In addition, even if the plate material 17 to be colored is thin, the flatness of its surface can be ensured, and there is a practical effect that the coherence of the electric field from the return electrode plate 5 can be sufficiently ensured.

As a result, when this device is used to perform AC electrolytic treatment between the plate material 17 to be colored and the counter electrode plate 5 in the presence of an electrolytic solution containing a metal salt, primary colors are formed on the surface of the plate material 17 to be colored. Another effect is that a clearly colored film can be obtained.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of an electrolytic coloring apparatus according to an embodiment of the present invention, and FIGS. 2 and 3 are sectional views taken along line AA and BB in FIG. 1, respectively. 1... Electrolytic cell, 4... Pedestal, 5... Return electrode, 7
... Hollow part, 9 ... Through hole, 17 ... Plate material to be colored.
d...Small interval.

Claims (1)

[Scope of utility model registration request] The electrolytic cell 1 has a hollow part 7 in which negative pressure is generated by pump suction, and a large number of through holes 9, 9, . . . are formed on one side to communicate the hollow part 7 with the outside. A flat plate-shaped pedestal 4 and a counter electrode plate 5 held so as to face parallel to the through-hole forming surface of the pedestal 4 at a minute interval d are disposed, and the pedestal 4
A plate material 17 to be colored made of aluminum or an aluminum alloy is interposed between the electrode plate 5 and the counter electrode plate 5, and the plate material 17 to be colored is adsorbed and fixed to the 4th surface of the pedestal by the negative pressure in the hollow part 7 of the pedestal. An electrolytic coloring device characterized by: