JPS60159147A - Aluminum alloy - Google Patents

Abstract

PURPOSE:To form a fine striped pattern similar to straight grain of wood by etching an Al alloy plate contg. a specified amount of V, Cr or B and specified amounts of Mg and Mn as essential components or further contg. Cu and by carrying out chemical polishing or electropolishing as required. CONSTITUTION:An Al alloy contg. 0.5-2.5% V, 0.5-2.5% Cr or 0.5-2.0% B, 0.5-1.5% Mg and 0.5-1.0% Mn as essential components or further contg. 0.02- 0.3% Cu is cast into an ingot. This ingot is homogenized, hot rolled, and cold rolled. The resulting Al alloy plate is etched by 0.25-0.70g/dm<2> extent of dissolution by treatment with an aqueous NaOH soln. having 20% concn. at 45 deg.C for 5min to form a fine striped pattern similar to straight grain of wood on the surface of the plate. The striped pattern may be made bright by processing such as chemical polishing or electropolishing so as to obtain an Al alloy plate having an improved decorative effect and superior strength.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to aluminum alloys, and in particular, to aluminum alloys, which can form very beautiful striped patterns such as straight-grain patterns through simple processing, and which also have excellent strength. This invention relates to aluminum alloys.

[Prior art and problems]

Conventionally, methods for forming patterns on the surface of aluminum alloys include mechanical means such as embossing or chemical means such as etching.

However, these means, for example the former means, use rolling pressure rolls or press molds, and can only be applied to flat plates, and since rolls and molds are used, the equipment itself is correspondingly large. In addition, the latter method requires special techniques and equipment, as it involves etching the photoengraved original picture, masking it with paint, etching, and printing. This inherently has disadvantages such as low productivity and furthermore, it can only be applied to small items.

There is also a method of patterning using electrochemical means during surface treatment, but this requires special electrolytic technology and treatment equipment, making stable operation difficult.

Therefore, even if an attempt is made to form a beautiful straight-grained pattern using the above-mentioned means, the above-mentioned drawbacks remain, and a beautiful straight-grained pattern cannot be easily formed.

[Disclosure of the invention]

The inventor has determined that at least VO, 5-2,5%, Cr
0.5-2.5%, Bo, 5-2.0% Noy or more, Mg 0.5-1.5%, Mn O, 5-1
．． Aluminum alloy consisting of 0% and residual kt including other unavoidable impurities, or at least Vo, 5 to 2.5
%, Cr□, 5 to 2.5%, Bo, s to 20%, MgO, 5 to 1.5%, and Mn0.
A wrought aluminum alloy consisting of 5% to 1.0% CuO, 02% to 0.3% CuO, and the remainder KT containing other unavoidable impurities can be processed by etching treatment only, or by chemical polishing or electrolytic polishing after etching treatment. They discovered that, for example, beautiful straight-grain striped patterns can be formed through processing, and such pattern-forming materials are subjected to treatments such as anodizing, electrolytic coloring, dyeing, and painting as necessary (applications) to achieve the desired purpose. He created something suitable.

Kokote Mg 0.5-1.5% and M'n 0.5-1.5%
Containing 1.0% means that Mg is less than 0.5% and Mg is less than 0.5%.
n is less than 0.5% and the total amount of Mg and Mn is 1%
If the amount is less than 1, the elements (■), Cr, or B, which are necessary for pattern appearance, will be largely segregated in the ingot, and as a result, unless the amount of surface cutting of the ingot is increased, it will not be possible to obtain the desired beautiful pattern. Also, for this reason, it is necessary to add a large amount of V, Cr, or B. If a large amount of V, Cr, or B is added in this way, the ingot will not be able to be obtained during casting. This is because cracking tends to occur and stable casting becomes difficult.On the other hand, when Mg exceeds 1.5% and Mn exceeds 1.0%,
If the total amount of Mg and Mn is too large, productivity during casting, rolling, etc. will decrease, and if there is too much Mn, giant crystals of Mn-based compounds will be formed. If this happens, the pattern that appears will be uneven and lose its beauty.Furthermore, if alumite treatment is performed after pattern formation, Mn will naturally develop color, which is sensitive to heat history and causes color unevenness. ,or,
(2) The effect of preventing the segregation of Cr or B is also small. Further, as a side effect, the addition of Mg and Mn also improves strength, for example.

Also, as a component of aluminum alloy, ■ is 0, 5-2
．． 5%, Cr 0.5-2.5%, or B 0.5-2.5%
The reason why 2.0 is frequently used is that unless it is made of an aluminum alloy containing at least V, Cr or B, a straight-grained streak pattern cannot be produced simply by etching. This is because if the amount added is small, clear straight-grained streaks cannot be produced by etching alone. That is, V, Cr or B is 0.5
By adding more than % of aluminum, a beautiful straight-grained pattern appeared when the wrought aluminum alloy material was etched.

In addition, if a wrought aluminum alloy material containing too much Cr or B is etched, the beautiful straight-grained pattern will not appear, that is, 2.
Beautiful patterns could not be created unless the aluminum alloy contained 5% or less Cr, 2.5% or less Cr, and 2.0% or less B. Furthermore, when etching is applied to wrought aluminum alloy materials containing V, Cr, or B in excess of the upper limits for addition, it becomes extremely difficult to remove smut that has adhered to the surface during etching, and the smut formed during subsequent processing becomes difficult to remove. It also has a significant negative effect on the properties of the surface film. In addition, aluminum alloy wrought materials containing V, Cr or B in excess of the above-mentioned upper limit values have extremely poor workability, particularly in the direction orthogonal to the direction of streaks that appear due to etching treatment. It becomes something.

Further, the reason why Cu was further added was that by including Cu, the glitter property was improved, and as a result, the striped pattern such as the straight grain tone became clearer, and this had a remarkable effect on the appearance of the pattern. Also, depending on the application, when plating treatment such as electroless plating is required, general alloys containing Mg have poor adhesion and require special pretreatment (activation treatment), but Cu This is because if it was included, a sufficiently good plating film could be obtained in a normal plating process without such special pretreatment. Furthermore, this C
The reason why the content of u is set to 0.02 to 0.3% is because if it is too small, the above-mentioned effect will be poor, and if it is too large, the ingot will easily break during casting. .

Then, the aluminum alloy wrought material having the above composition is applied at a rate of 0.15 to 0.80 g/di, more preferably 0.2 g/di.
By performing etching treatment with a dissolution amount of 5 to 7 og/d, 1, a striped pattern with a clear straight grain tone can be easily formed. For example, a caustic soda aqueous solution (20% N
A beautiful striped pattern appears by alkali etching at 40° C. for 5 minutes.

In addition, during the etching process, 0.15 to 0.80 g/
d1, heavier is 0.25-0.70 g/d,,
The reason why the etching treatment was performed at a dissolution amount of ; is because if the etching treatment is too weak, it is difficult to obtain a clear and beautiful streak pattern, and conversely, if the etching treatment is too strong, a rough streak pattern will result. This is because it is difficult to obtain a beautiful surface.

In addition, if the etching process is too weak as mentioned above, there is a problem, but if the etching process is only relatively weak, then electrolytic polishing or chemical polishing can be performed after the etching process to solve the above-mentioned problem. This not only eliminates the above drawbacks, but also makes it excellent for applications that require brightness, such as decorative products. However, for applications that require such brightness, it is sufficient to perform an etching process that is slightly weaker than the etching process described above, and it is sufficient to perform an etching process that is relatively weak. It is not limited only to. That is,
After etching the material so that the dissolved amount is 0.810~0.60 g/dm, preferably 0.20~0.50 g/am, electropolishing or chemical polishing under normal conditions produces beautiful and clear streaks. It has a pattern and is rich in glitter.

The mechanism by which such a beautiful straight-grained streak pattern appears is thought to be as follows. That is, the aluminum alloy used in the present invention contains V, Cr,
Since each of the additive elements such as B is contained in amounts exceeding the solid solubility limit at the stretching temperature, large crystallized substances of approximately 20 μm or more are present, which are crushed along the stretching direction during the stretching process. Then, as the crystallized material falls off and dissolves during the etching process, the aluminum surrounding the crystallized material also dissolves, creating irregularities perpendicular to the processing direction, resulting in a surface with a streaked appearance. considered to be a thing.

[Example 1] An aluminum alloy ingot consisting of Az-1,0%Mg-0,84Mn-0,8%V and other unavoidable impurities was homogenized by a conventional method, and then hot- and cold-rolled. , make plate materials (2,0T, 0.8T, 0.6T).

Next, after degreasing the above-mentioned wrought material, 10% NaOH145
℃ for 5 minutes to dissolve the plate surface at approximately 0.3g/am'', then 10mm Na
Neutralize with OH1 at room temperature for 3 minutes.

If you look at the surface of the board material obtained in this way, you will see that the surface has a clear, beautiful, straight-grained pattern.

In addition, after the above neutralization treatment, chemical polishing treatment or electropolishing treatment such as 1.517J-# treatment at 100°C using, for example, Shinwa Kasei's 7 Yinal, produces clear and beautiful straight grain lines. A pattern was obtained with surface characteristics rich in glitter.

[Example 2] An aluminum alloy ingot consisting of At-0.8%Mg-0.6%Mn-1.2%Or and other unavoidable impurities was subjected to alkali etching treatment using 20% NaOH at 145°C for 3 minutes. When treated in the same manner as in Example 1 except that the dissolution amount was about 0.25 g/dmJ, a clear, beautiful striped pattern with a straight grain tone appeared, and chemical polishing or electrolytic polishing after neutralization treatment It can also become highly glittery through processing.

[Example 3] A4-1.3%Mg-0,8%Mn-0,6%B
An aluminum alloy ingot containing other unavoidable impurities was subjected to alkaline etching treatment using 20% NaOH at 140°C.
The dissolution amount was approximately 0.6 g/d under the conditions of 11 minutes.
When processed in the same manner as in Example 1 except that rrl was used,
A beautiful striped pattern with a clear, straight-grain tone appears, and it also becomes highly bright due to the chemical polishing or electrolytic polishing treatment after the neutralization treatment.

[Example 4] Az -0,8%Mg-0,6%Mn-2,0%V-0
, 1% Cu and other unavoidable impurities is treated in the same manner as in Example 1, resulting in a beautiful streaked pattern that is rich in brightness, clear, and straight-grained.

[Example 5] At-1,3%Mg-0,8%Mn-1,0%Cr-Q
An aluminum alloy ingot consisting of 2% Cu and other unavoidable impurities was subjected to alkali etching treatment using 20% NaOH.
, 60℃, 5 minutes, the amount dissolved is about 45g.
When processed in the same manner as in Example 1 except that 7d and t were used, a beautiful striped pattern rich in brightness, clear, and straight-grained appears.

[Example 6] A4-1.0%Mg -0.7%Mn -0.8%
When an aluminum alloy ingot consisting of B-0, 25% Cu and other unavoidable impurities was treated in the same manner as in Example 3, a beautiful striped pattern with brightness, clarity, and straight grain was obtained. .

[Examples 7 to 10] A7-0.8%Mg-o, s%Mn-1,0%C
r-0,5%M Aluminum alloy consisting of other unavoidable impurities, At-1,0%Mg-0,6%Mn-1,0%
Cr-0.5%B Aluminum alloy consisting of other unavoidable impurities, A7-0.6%M g -0.8%Mn-1
,0%V-0.6%BAluminum alloy consisting of other unavoidable impurities, At-0,6%Mg-0,6%
M n -0.8% ■ -07% Cr - 0.6% B When an aluminum alloy ingot consisting of other unavoidable impurities is treated in the same manner as in Example 1, a beautiful streak pattern with a clear, straight-grain pattern is obtained. It is exposed and becomes more brilliant by chemical polishing or electrolytic polishing treatment.

[Examples 11 to 14] At -0,8% M g -0,8% M n -1
,0%Cr-0,5%V-O, t%CuAluminum alloy consisting of other inevitable impurities, At-1,01Mg-
0,61Mn-1,0%Cr-Q, 5%B-〇, 2%C
u Aluminum alloy consisting of other unavoidable impurities, A
t -0,6%M g -0,8%Mn-1,o%V
-0.6%B-0.25%CuAluminum alloy consisting of other unavoidable impurities, A4-0.6%Mg-0.6%
M n -0,8%V-〇,7%Cr-I medium 0
．． When an ingot of aluminum alloy consisting of 6%B-0.2%Cu and other unavoidable impurities is treated in the same manner as in Example 1, a beautiful streaked pattern with brightness, clarity, and straight grain appears. .

The striped material obtained in the above example may be subjected to general surface treatments such as alumite treatment, dyeing treatment, electrolytic coloring treatment, natural coloring treatment, clear coating treatment, etc., depending on the various uses. Even after such post-processing, the beautiful striped pattern will not disappear.

〔effect〕

It is highly productive, low cost, has excellent strength, and can form beautiful striped patterns through simple processing.

In addition, those containing Cu have excellent brightness and, for example, in cases where plating treatment is required, they can be performed without special activation treatment. have

Claims (1)

[Claims] ■ A little bit V 0.5-2.5%, Cr 0.5-2
．． 5%, one or more of BO05-2.0%, and M
An aluminum alloy consisting of gO, 5-1.5%, MnO, 5-i,o%, and the remainder At, including other unavoidable impurities. ■ At least Vo, 5-2.5%, Cr0.5-2.
5%, one or more of BO05-2.0%, and M
An aluminum alloy consisting of 0.5 to 1.5% g, 0.5 to 1.0% Mn, 02 to 0.3% CuO, and the remainder kt containing other unavoidable impurities.