JPS60159146A - 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 a specified amount of 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 and 1.0-1.8% 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 chemical polishing or electropolishing so as to improve the decorative effect.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an aluminum alloy, and more particularly to an aluminum alloy that can form extremely beautiful striped patterns, such as a straight grain pattern, with a simple process.

[Conventional technology 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 methods, such as the former method, use rolling rolls or press molds, and can only be applied to flat plates.Also, since rolls and molds are used, the equipment itself is large and costly. In addition, the latter method requires special techniques and equipment, as it involves etching the original picture that has been photoengraved, masking it with paint, etching, and printing. It has many drawbacks, such as low productivity and being only applicable 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%, CrO
, 5 to 2.5% or BO 15 to 2.0%, and Mn 1.0 to 1.8% as essential components, including other unavoidable impurities and the remainder A7, or even a little V 0.5-2.5%, Cr□, any one or more of 5-2.5% or 130.5-2.0%, and Mn
A wrought alloy consisting of 1.0 to 1.8% CuO and 102 to 03% CuO as an essential component, and the remaining At containing other unavoidable impurities can be processed by etching treatment only, or by chemical polishing or electrolytic polishing after etching treatment. For example, we discovered that a beautiful striped pattern with a straight grain tone can be formed, and we applied treatments such as anodizing, electrolytic coloring, dyeing, and painting to such pattern-forming materials as needed (applications) to create a pattern that was suitable for the purpose. He created something.

Here, the reason for containing 1.0 to 1.8% Mn is that Mn
If the amount is less than 1%, elements for pattern appearance ■,
Cr or B is largely segregated in the ingot, and as a result, the desired beautiful pattern cannot be obtained unless the amount of surface cutting of the ingot is increased. In this way, ■, C
This is because if a large amount of r or B is added, the ingot tends to crack during casting, making stable casting difficult.On the other hand, if Mn is too large, exceeding 1.8%, , the productivity in terms of processing such as casting and rolling is reduced, and giant crystals of Mn-based compounds are formed, resulting in uneven patterns and a loss of aesthetic appearance.
For example, if aluminium I treatment is performed after pattern formation, Mn will naturally develop color, which has the disadvantage of being sensitive to heat history and causing color unevenness, and may warp, Cr or I
This is because the anti-segregation effect of No. 3 is also small. In addition, the addition of Mn not only has such a large effect, but also has other secondary effects, such as improving strength. If it is not included, the tensile strength is only about the same as that of 1200 alloy, but the strength is equal to or higher than that of 3003 alloy.

Also, as a component of aluminum alloy, V is 0.5 to 2
．． 5%, Cr 0.5-2.5%, or B 0.5-2
．． The reason why 0 axes are used is that unless the aluminum alloy is made of an aluminum alloy that contains at least Cr or B, a straight-grained striped pattern cannot be produced simply by etching treatment. This is because if the amount is small, clear straight-grained streaks cannot be produced by etching alone. That is, ■, 0.5% Cr or B
By incorporating the above ingredients, a beautiful straight-grained pattern appeared when the aluminum alloy wrought material was etched.

Furthermore, if a wrought aluminum alloy material containing too much V, Cr, or B is etched, the beautiful straight-grained pattern will not appear.
% or less, Cr content is 25% or less, and B content is 2.0% or less. Otherwise, a beautiful pattern could not be created. Furthermore, when aluminum alloy wrought materials containing Cr or B in excess of the upper limit added are subjected to etching treatment, it becomes extremely difficult to remove smut that adheres to the surface due to etching, and the smut that is formed in subsequent treatments becomes difficult to remove. It also has a large adverse effect on the properties of the surface film. In addition, aluminum alloy wrought materials containing Cr or B in excess of the above-mentioned upper limit have significantly poor workability, especially in the direction orthogonal to the direction of the part exposed by etching treatment. It becomes something.

Furthermore, the reason why Cu was added was that by impregnating Cu, the brightness was improved, and as a result, the streaks such as straight-grained patterns became even clearer, which had a remarkable effect on the appearance of the pattern. be. Also, depending on the application, if it is necessary to perform plating treatment such as electroless plating, Cu
The alloy A, which does not contain Cu, has poor adhesion and requires special pretreatment (activation treatment), but if it contains Cu, it can be plated normally without any special pretreatment. This is because a sufficiently good plating film was obtained in the treatment process. still,
The reason why this Cu content is set to 0.02 to 0.3% is because if it is too small, the above-mentioned effect will be poor.
This is because if the amount is too large, the ingot will easily crack during casting.

Then, a wrought material of aluminum alloy having the above composition is applied at 0.15 to 0.80 g/di, preferably 0.15 to 0.80 g/di.
By etching with a dissolution amount of 25 to 0.70 g/d7rt, a striped pattern with a clear straight grain tone can be easily formed. For example, a caustic soda aqueous solution (20
By alkali etching with f3NaOH etc. at 40° C. for 5 minutes, a beautiful striped pattern appears.

In addition, during etching treatment, 0.15 to 0.80 g/d
m2, more preferably 0.25 to 0.70. g/d
The reason why the etching treatment was performed with a dissolution amount of m' is because if the etching treatment is too weak, it will be difficult to obtain a clear and beautiful streak pattern, and conversely, if the etching treatment is too strong, it will result in a rough streak pattern. 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 disadvantages, 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 above-mentioned etching process alone; It is not limited to only. That is, after performing an etching process such that the amount of dissolved material is 0.10 to 0.60 g/dm', more heavily 0.20 to 0.50 g/dm, electrolytic irradiation [polishing or chemical polishing] is performed under normal conditions. , a beautiful and clear striped pattern, and 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, and B.
Because these additive elements are each contained in amounts exceeding the solid solubility limit at the stretching temperature, large crystallized substances of approximately 20 μm or more are present, and these are crushed along the stretching direction during the stretching process. The crystallized material falls off and dissolves during the etching process, and the aluminum surrounding the crystallized material also dissolves, creating irregularities perpendicular to the processing direction, resulting in a surface with a streaked appearance. it is conceivable that.

[Example 1] An aluminum alloy ingot consisting of AJa-1,4%Mn-0,8%V and other inevitable impurities was homogenized by a conventional method, and then hot- and cold-rolled to form a sheet material. (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 a rate of about 0.3 g/di, and then 10% HN O3,
Neutralize 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.

[Example 2] In Example 1, after the neutralization treatment, ordinary chemical polishing (treatment at 100°C for 1.5 minutes using Shinwa Kasei Shinal) or electrolytic polishing treatment resulted in a clear image. , a beautiful striped pattern with a straight-grain tone and surface characteristics rich in brilliance was obtained.

Example 3] An aluminum alloy ingot consisting of A/-1,2%Mn-1,2CHCr and other unavoidable impurities was subjected to alkaline etching treatment using 20% NaOH at 145°C for 3 minutes, and the molten Wj When the rig (with an amount of about 0.25 g/d m') was treated in the same manner as in Example 1, a clear and beautiful straight-grained streak pattern appeared on the surface.

[, Example 4] Similar to Example 3, when chemical polishing or electrolytic polishing was performed after neutralization treatment, a clear, beautiful streaked pattern with a straight grain tone was obtained, as well as brightness. A material with rich surface properties was obtained.

[Example 5] An aluminum alloy ingot consisting of At -15% M n '' 0.6% B and other unavoidable impurities was subjected to alkali etching treatment using 20% NaOH at 140°C for 11 minutes, and the amount of dissolution was approximately When processed in the same manner as in Example 1 except that the treatment was carried out at 0.066 g/di'', a clear and beautiful straight-grained streak pattern appeared on the surface.

[Example 6] In Example 5, as in Example 2, alkaline etching treatment (however, the amount dissolved was about 0.5 g/d)
m'', treated slightly weaker than in Example 5) and chemical polishing or electrolytic polishing after neutralization treatment, clear, +i1
A product with a beautiful streaked pattern and a highly glittering surface was obtained.

[Example 7] When an aluminum alloy ingot consisting of A4-1.2% Mn-2.0% v-Q, 1% Cu and other unavoidable impurities is treated in the same manner as in Example 1, it has high brightness, and clear;
A beautiful striped pattern with a straight grain tone was obtained.

[Example 8] In Example 7, chemical polishing or electrolytic polishing was performed after neutralization as in Example 2, resulting in a beautiful, clear, and straight-grained finish with better brightness than in Example 7. A striped pattern was obtained.

[Example 9] At-1,6%Mn-1,0%Cr-0,2%C
u An aluminum alloy ingot consisting of other unavoidable impurities is subjected to alkaline etching treatment using 20% NaOH at 160°C.
, 5 minutes, and the amount dissolved is approximately o, 45 g, 7 d, 7
When processed in the same manner as in Example 1, except for the following, a beautiful striped pattern with high brightness, clarity, and a straight grain tone was obtained.

[Example 10] In Example 9, chemical polishing or electrolytic polishing was performed after neutralization in the same manner as in Example 2, resulting in a beautiful, clear and straight-grained finish with better shine than in Example 9. A striped pattern was obtained.

[Example 11] A t -1,4%M'n -0,8%B-0,25
When an aluminum alloy ingot containing %Cu and other unavoidable impurities is treated in the same manner as in Example 3, it has high brightness,
A beautiful striped pattern with a clear, straight-grain tone was obtained.

[Example 12] In Example 11, chemical polishing or electrolytic polishing was performed after neutralization as in Example 2, resulting in a clear and beautiful straight-grained finish with better shine than in Example 11. A striped pattern was obtained.

[Examples 13 to 16] At-1, an aluminum alloy consisting of At-1,4%Mn-0,6%V-1.0%Cr and other inevitable impurities
, 2%Mn -06%v -i, o%B Aluminum alloy consisting of other inevitable impurities, A t-1,5%M
Aluminum alloy consisting of n-1.0%Cr-0.6%B and other unavoidable impurities, A4-1.4%M n-0,
When an aluminum alloy ingot consisting of 5% V - 0.5% Cr - 0.5% B and other unavoidable impurities is treated in the same manner as in Example 1, a clear, beautiful streaked pattern with straight grain appears, and When this is chemically polished in the same manner as in Example 2, it becomes highly glittery.

Examples 17 to 20] A t −1,4% M n −0,6% v −i, o
%Cr-0,1%CuAluminum alloy consisting of other unavoidable impurities, At-1,2%Mn-0,,6%V
-1.0%B-0,15%Cu Aluminum alloy consisting of other inevitable impurities, At-1,5%Mn-1,0
%Cr-o, e%B -0,2%Cu Aluminum alloy consisting of other unavoidable dull materials, At -1,4%M
n -05%■-05%Cr-0.5%B-0.1%C
When an aluminum alloy ingot containing other unavoidable impurities is treated in the same manner as in Example 1, a clear, beautiful streaked pattern with straight grain appears.

In addition, the material with the striped pattern obtained in Example 2 may be subjected to general treatments such as alumite treatment, dyeing treatment, electrolytic coloring treatment, natural coloring treatment, clear coating treatment, etc. according to various uses. The beautiful striped pattern will not disappear even after such post-treatment.

(Effects) Beautiful striped patterns such as straight-grain patterns can be easily formed with good productivity and low cost.

Furthermore, this aluminum alloy has favorable properties in terms of strength.

In addition, those further containing Cu have excellent brightness and, for example, in cases where plating treatment is required, no special activation treatment is required as a pretreatment. It can also be implemented, etc., and has one feature, one advantage, and one advantage.

Claims (1)

[Claims] ■ At least V O, 5-2.5%, Cr095-2
5%, BO15 to 2.0%, and Mn
1.0 to 18%, including other unavoidable impurities, and the remaining At
An aluminum alloy consisting of. ■ At least VO, 5-2.5%, Cr0.5-2
．． 5%, one or more of BO15-2.0%, and M
An aluminum alloy formed by etching an alloy consisting of n1,0~], 8chi, and the remainder kl containing other unavoidable impurities. ■ At least VO, 5-2.5%, Cr0.5-2
．． 5%, Bo, one or more of 5 to 2.0%, and M
n1. An aluminum-minilum alloy formed by etching, chemical polishing, or electrolytic polishing an alloy consisting of 0 to 1.8 mm and residual Az containing other unavoidable impurities. ■ At least V 0.5-2.5%, Cr 0.5-2
．． 5%, Bo, one or more of 5 to 2.0%, and M
An aluminum alloy consisting of 1.0 to 1.8% n, 0.92 to 0.3% Cu, and the remainder kt containing other unavoidable impurities. ■ At least Vo, s -2.5%, Cr 0.
5-2.5%, Bo, 5-2. one or more of Mn1. O-1,8% and Cu O,02-0
, 3%, and the remainder A and t, including other unavoidable impurities, is etched. ■ At least Vo, 5-2.5 To, Cr O,
5-2.5%, Bo, any one or more of 5-20chi, Mn 1.0-1.8%, Cu0,02-o, 3chi, and the remainder A4, including other unavoidable impurities. An aluminum alloy obtained by etching and chemical polishing or electrolytic polishing an alloy consisting of: