JPS5817280B2 - 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 to give a uniform color on the surface and have been used in various fields, but those with shading patterns on the surface are the same as those with the uniform color mentioned above. It has a different decorative effect 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.).
Etsunning, washing with water, neutralization, and washing with water) are performed, followed by anodization to form an anodic oxide film.

The strip 1 is introduced into the electrolytic coloring liquid 3 of the electrolytic coloring tank 2, moved by a suitable distance, and taken out above the electrolytic coloring liquid 3.

Electrolytic coloring progresses while the strip 1 is moving through the electrolytic coloring solution 3, but when the strip 1 is introduced into the electrolytic coloring solution 3, the interface between the anodic oxide film, the electrolytic coloring solution 3, and the atmosphere (the liquid level of the electrolytic coloring solution) It exists not only above, but also above it.

), the current passing through the electrolytic coloring liquid 3 is rapidly concentrated, which significantly affects the degree of electrolytic coloring.

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 anodic oxide film so that it can be wetted by the electrolytic coloring 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. .

) has a lower concentration of current than the concave portions 7 (forming the interface), and the anodic oxide film at the convex portions is less electrolytically colored than that at the concave portions 7.

After the electrolytic coloring process has been completed, the strip 1 has a light color in the areas where the protrusions 6 are located, and a dark color in the areas where the recesses 7 are located.

, the electrolytic coloring treatment of strip plate 1 is different from that shown in Fig. 3.
It may be done as shown in the figure.

That is, the strip 1 is introduced into the electrolytic coloring liquid 3 through the inlet 10 of the side wall 9 of the electrolytic coloring tank 8, moved laterally, and taken out through the outlet 12 of the side wall 11.

A pattern forming material 4 is placed outside the inlet 10 at the interface between the anodic oxide film, the electrolytic coloring solution 3, and the atmosphere, and electrolytic coloring is performed by creating the difference in the degree of current concentration.

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 of AC secondary electrolytic coloring of the present invention, a 2S aluminum material (thickness 0.5 mm) was run at 4 m/min, sulfuric acid was used at 300 i/l, liquid temperature was 30°C, and current density was 10.
Anodized at A/c 1m'', passed through a pattern forming material (Teflon, fixedly installed) with a convex width of 10m1n and a concave width of 2mm.
0 g/l, sulfuric acid 209/l, liquid temperature 25°C, AC voltage 1
Electrolytic coloring was carried out at 5 V for 2 minutes to form a linear vertical striped pattern in which the convex portions were colored a light olive color and the concave portions were colored a dark bronze color.

In the present invention, all coloring methods for electrolytically coloring 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]

FIGS. 1-3 are schematic diagrams of an apparatus for carrying out the invention, and FIG. 2 is a partially front view of the material. 1... Band plate, 3... Electrolytic coloring liquid, 4...
...Pattern forming material, 6...Protrusion, 7...
...concavity.

Claims (1)

[Claims] 1. When introducing aluminum or its alloy with an anodic oxide film into an electrolytic coloring solution, a pattern forming material is placed on each surface of the anodic oxide film, the electrolytic coloring solution, and the atmosphere, and the difference in the degree of current concentration at the interface is This is a method for patterning aluminum or its alloys, in which the aluminum or its alloys are electrolytically colored and patterned.