JPS5817279B2 - aluminum material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for providing shading patterns on the surface of aluminum or its alloys.

Conventionally, aluminum or its alloys have been colored by electrolytic coloring or dyeing to give the surface a uniform color, and these have been used in various fields. It has a decorative effect different from that of other colors, and is made using a coloring method that requires special equipment such as printing and double alumite, but it is expensive.

According to the present invention, shading patterns can be easily applied to the surface of aluminum or its alloy without requiring any special equipment.

The invention is illustrated in the drawings.

An aluminum or aluminum alloy strip 1 wound around an uncoiler (not shown) is unwound from the uncoiler and run at a predetermined speed to perform the usual pretreatments (degreasing, washing, washing, etc.).
Etching, water washing, neutralization, and water washing) are carried out, and as shown in Figure 1, the anodizing solution 3 in the anodizing tank 2 is introduced from above, and moved an appropriate distance to be placed above the anodizing solution 3. Take it out.

The formation of an anodic oxide film progresses while the strip 1 is introduced into the anodizing solution 2 and transferred, but when the strip 1 is taken out from the anodizing solution 2, the already formed anodic oxide film and the anodizing solution 2 are mixed with the atmosphere. interface (exists not only at the surface of the anodizing solution but also above it).

), the current flowing through the anodic treatment solution 2 is rapidly concentrated and has a significant effect on the formation of the anodic oxide film.

At the interface, a pattern forming material (rubber, Teflon, etc.) 4
, and its end 5 is brought into contact with the anodic oxide film, or
Position it at a very slight distance from the anodized film so that it can be wetted by the anodizing solution.

The end portion 5 of the pattern forming material 4 consists of a rectangular convex portion 6 and a concave portion 7, for example, as shown in FIG. 7 no.

) has a lower degree of concentration of current than the concave portion 7 (forming the interface), and the anodic oxide film at the convex portion 6 and concave portion 7 is dependent on the film thickness, micropore density, and micropore density. This causes a difference in diameter, etc., and a large difference in the properties of the anodic oxide film.

When the strip 1 on which the anodic oxide film has been formed is colored by various coloring methods, differences in the shade of color occur due to the difference in the anodic oxide film.

This difference in density varies depending on the conditions for forming the anodic oxide film and the coloring method.

The anodization of the strip 1 may be different from that shown in FIG. 1 and may be performed as shown in FIG. 3.

That is, the strip 1 is introduced into the anodizing solution 3 from the inlet 10 of the side wall 9 of the anodizing tank 8, moved laterally and taken out from the outlet 12 of the side wall 11, and the anodized film of the strip 1 and the anodizing solution 2 are removed. The pattern forming material 4 is installed at the interface between the anodic oxide film and the atmosphere, and the anodized film is made to have a large difference in properties in the same manner as described above.

In the present invention, the same applies to the foil as to the strip.

(Patterns can be added in the same manner as in the band plate embodiment described later.

) If the pattern forming material 4 is fixed, it will form a linear vertical striped pattern, if it approaches and separates at the same location, it will form an interrupted linear vertical striped pattern, and if it moves back and forth in the horizontal direction, it will form a meandering vertical striped pattern.

Next, to explain an example using electrolytic coloring (AC secondary electrolytic coloring) of the present invention, 2S aluminum material (thickness 0.5 mm)
) was run at 4 m/min, sulfuric acid was 300 g/l, and the liquid temperature was 30 m/min.
℃, anodized at a current density of 10 A/di, and the width of the protrusion was 10
mm, passed through a pattern forming material (Teflon, fixedly installed) with a recess width of 2 mm, and 3 g/l of Daiichi sulfuric acid.
Nickel sulfate 30 g/l, sulfuric acid 209/l, liquid temperature 25
It was electrolytically colored at 15° C. for 2 minutes at an AC voltage of 15 V to form a linear vertical striped pattern in which the convex portions were colored bronze and the concave portions were colored stainless steel.

To explain an example of inorganic salt immersion coloring of the present invention, two
S Aluminum material with 1% iron ammonium oxalate (liquid temperature 60℃)
) for 5 minutes, forming a linear vertical striped pattern in which the convex portions were colored pale yellow and the concave portions were colored yellow.

To explain an example of dye coloring of the present invention, a 2S aluminum material that has been anodized and passed through the material as described above is treated with Oxal Red REG conc, a liquid of 3 g/l.
(liquid temperature: 60° C.) for 3 minutes to form a linear vertical striped pattern in which the convex portions were colored light red and the concave portions were colored dark red.

In the present invention, in addition to the above-mentioned coloring methods such as electrolytic coloring, all coloring methods that utilize an anodic oxide film can be used.

By the method of the present invention, a light and shade pattern can be formed on the surface of aluminum or its alloy, and since the pattern can be changed freely, it has a decorative effect different from that of conventional products and can be used in various fields.

[Brief explanation of the drawing]

1 and 3 are schematic diagrams of an apparatus for carrying out the present invention, and FIG. 2 is a partial front view of the material. 1... Band plate, 3... Anodizing solution, 4...
...Pattern forming material, 6...Protrusion, 7...
...concavity.

Claims (1)

[Claims] 1. When aluminum or its alloy is anodized with an anodizing solution and taken out from the anodizing solution, a pattern forming material is installed at the interface between the generated anodic oxide film, the anodizing solution, and the atmosphere, and a current is applied at the interface. A method for patterning aluminum or its alloys that creates a difference in the degree of concentration and colors the aluminum or its alloys to create a shaded pattern.