JPH01272740A - Aluminum alloy for self-color anodizing - Google Patents

Abstract

PURPOSE:To obtain the title Al alloy on which a uniform self-color anodizing film having good reproducibility can be formed without requiring complicated treatment by specifying the compsn. consisting of Li, Y, La, Pr, Nd, Sm and Al. CONSTITUTION:The Al alloy for self-color anodizing contains, by weight, one or more kinds among 0.05-3.5 % Li, 0.05-10.0% Y, 0.05-10.0% La, 0.05-10.0% Pr, 0.05-10.0% Nd and 0.05-10.0% Sm, furthermore contains at need one or more kinds among 0.05-1.5% Fe, 0.05-7.0% Mg, 0.05-1.5% Si, 0.05-7.0% Zn and 0.05-1.5% Mn and/or one or more kinds among 0.05-0.5% Cr, 0.05-0.3% Zr, <=0.5% Ti, <=0.1% B and 0.05-0.5% V and the balance consisting of Al with inevitable impurities. In the above alloy, the self-color anodizing film for decoration or having corrosion resistance whose color tones are easily variable can be uniformly formed by changing the conditions of anodizing treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a color-forming aluminum alloy, particularly anodized aluminum alloy, which produces a corrosion-resistant color film on the surface for decoration or base treatment, and is used as a decorative material or a building material. , relates to aluminum alloys used as materials for utensils, etc.

BACKGROUND ART Conventionally, corrosion-resistant anodic oxide films exhibiting various colors have been produced on the surface by anodizing aluminum alloys containing color-forming elements (for example, Japanese Patent Publication No. 43-11529). No., Special Publication 1977-163
No. 41, Special Publication No. 56-12301, Special Publication No. 56-31
359, Special Publication No. 57-20400, Special Publication No. 61-2
0617 etc.).

Problems to be Solved by the Invention However, in the case of these conventional aluminum alloys, in order to obtain the desired color tone through anodizing treatment, the cooling rate during casting, homogenization treatment temperature, etc. must be set appropriately in advance in the alloy manufacturing process. The process was complicated and had poor reproducibility as it required constant control.

This invention was made in view of such circumstances, and
The object of the present invention is to provide a color-forming aluminum alloy that can produce a uniform color-forming film with good reproducibility without requiring complicated treatments in the manufacturing process.

Means for Solving the Problems To achieve the above object, the first aluminum alloy of the present invention has L i :0. 05-3. 5wt%, Y
:0.05~10.0wt%, La:0°05~10.
0w1%, Pr: 0.05-10.0wt%, Nd:
0.05-10.0wt%, Sm: 0.05-10.
The second one is characterized by containing one or more kinds of 0w1%, with the remainder consisting of aluminum and unavoidable impurities. 05-3.
5wt%, Y: 0.05-10.0wt%, La: 0
．． 05-10, 0wt%, Pr: 0.05-10
．． 0wt%, Nd: 0.05-10.0wt%, S
Contains one or more of m: 0.05 to 10.0 wt%, further Fe: 0.05 to 1.50 wt%,
Mg: 0. 05-7. 0wt%, Si:0.
05-1.5wt%, Zn: 0. 05~7.0w
1%, Mn:o, 05 to 1.5 wt%, and the remainder is aluminum and inevitable impurities;
: 0. 05-3. 5wt%, Y: 0°05~10
．． 0wt%, La: 0.05-10.0wt%, P
r: 0. 05-10. 0wt%, Nd: 0
．． 05-10.0wt%, Sm: 0.05-10, 0
Cr:
0.05~0.5wt%, Zr: 0°05~0
．． 3wt%, Ti: 0.5wt% or less, B: 0, l
vt% or less, V: 0.05-0. 1 out of 5wt%
The fourth one is L
i: 0. 05-B.

5wt%, Y: 0.05-10.0wt%, La: 0.
05-10.0wt%, Pr: 0.05-10, 0wt
%, Nd: 0.05-10.0wt%, Sm: 0
．． 05 to 10.0wt%, and further contains Mg: Q, 05 to 7.0wt%, Si
: 0. 05-1. 5wt%, Zn: 0, 05~
7. 0w1%, Mn: 0. 05~1゜5wt%
Contains one or more of the following, and further contains Cr:
0.05~0.5wt%, Zr: 0°05~0
．． 3wt%, Ti: 0.5wt% or less, B: 0.
lvt% or less, V: 0.05-0. It is characterized by containing one or more of 5 wt% of aluminum and the remainder consisting of aluminum and unavoidable impurities.

In the above aluminum alloy, Li5Y.

By incorporating one or more of these into aluminum, La, Pr, and Nd%Sm form an oxide film with different colors depending on the conditions of the anodizing treatment when the aluminum alloy is anodized. It has the effect of generating.

These are equivalent to each other in terms of such effects, but their contents are less than 0.05 wt% for Li and 0.05 wt% for Y.
%, La: less than 0.05wt%, Pr: 0.05w
less than t%, Nd: less than 0.05wt%, Sm: 0.
If it is less than 0.05 wt%, the above effect is poor, and conversely, L i :
3. 50wt%, Y:lQ.

0wt%, La: 10.0wt%, Pr: 10.0
wt%, Nd: 10.0wt%, Sm: 10.0w
If each content exceeds t%, only the same color tone can be obtained and the cost will only increase.

A particularly preferable content range is Li: 0.5 to 2.0 wt%;
Y: 1. 0-5. 0wt%, La: 1.0-5.
0wt%, Pr: 1. O~5. 0w
t%, Nd: 1.0-5. 0wt%, Sm: 1
．． It is 0 to 5°0 wt%.

Fe, Mg, and SiSZnSMn are all the above L 1
% YSLaSPrs Nds It has the effect of improving the strength of the alloy without impairing the effect of adding Sm. However, if the Fe content is less than 0.05 νt%, there is no such effect; conversely, if it exceeds 1.5 νt%, it becomes difficult to obtain a uniform color tone;
If Si exceeds 1.5 wt%, Zn near exceeds 0 wt%, and Mn exceeds 1.5 wt%, excessive amounts result in the formation of coarse intermetallic compounds. The preferred content range is Fe: 0. 5-1. 0wt%, M
g: 0.5 to 2.0 wt%, Si: 0. 5-1
．． 0wt%, Zn: 4. O~7.0wt%, M
n: 0.5 to 1.0 wt%.

Cr%Zrs"ri%B%V contributes to improving various properties such as refinement of alloy crystal grains and prevention of casting cracks without impairing the effect of adding Ce. However, its content Cr: less than 0.05 wt%, Zr: 0.
less than 0.05wt%, V: less than 0.05vt% or Ti
If 5B is not contained, the above effect is not present, and conversely, Cr
: more than 0.5wt%, Zr: more than 0.3wt%, T
i: more than 0°5wt%, B: more than 0.1wt%, v
: If it exceeds 0.5 wt%, it has the disadvantage of forming coarse intermetallic compounds.

The color tone of the oxide film obtained by anodizing the above aluminum alloy depends on the type of treatment solution, electrolysis time,
Various products can be obtained by changing processing conditions such as current density. For example, in the case of direct current electrolysis using a sulfuric acid-based treatment liquid, a pale gray or milky white film is obtained. In addition, in the case of AC electrolysis using an oxalic acid-based treatment solution, if the treatment time is short, the color becomes ivory-colored, and as the treatment time increases, it becomes yellowish, cream-colored, or even mustard-colored. However, in this invention, the conditions for such anodic oxidation treatment are not particularly limited.

Further, the method for producing the aluminum alloy according to the present invention is not particularly limited, and the aluminum alloy may be produced by conventional methods such as extrusion.

Effect of the invention This invention depends on the above-mentioned Li, Y, La.

Since it is an aluminum alloy containing one or more of Pr and Nd55m, as is clear from consideration of the examples described later, even if it is an aluminum alloy of 1, complicated processing is required in the manufacturing process. By simply changing the anodizing treatment conditions, for example, milky white,
It is possible to produce uniform and beautiful films with different tones, such as cream and mustard, with good reproducibility = there is little difference in color tone due to variations in film thickness,
For example, in the case of DC electrolysis using a sulfuric acid-based treatment liquid, even if the film thickness increases, the color tone does not change from milky white to grayish black.
You can get something stable. Therefore, as a low-cost aluminum material with excellent external color tone, it can be suitably used for decoration, architecture, utensils, etc., and its range of applications can be significantly expanded. In addition to Li, etc., Fe.

The aluminum alloy according to claim 2, which contains one or more of Mg5Si and ZnSMn in a predetermined range, can have excellent mechanical strength in addition to the above effects. In addition to Li, etc., Cr, Zr5TiSBS
Claim 3 containing one or more types of V in a predetermined range
In addition to the above-mentioned color tone effect, the aluminum alloy according to the above has fine crystal grains, and can be made into an aluminum alloy without casting cracks. In addition to Li, etc., Mg.

One or more of St, Zn, Mn, and C
The aluminum alloy according to claim 4, which contains one or more of r5Zr, Ti, and BSV in a predetermined range, is an aluminum alloy that has the effect of improving strength, refining grains, and preventing casting cracks in addition to the above-mentioned color tone effect. It can be done.

Example Next, this invention will be explained in detail.

Width 50M1 Length 10, consisting of various compositions shown in Table 1 below
A plurality of extruded materials having a thickness of 3 #011111+% were prepared as test materials. Note that the extruded material was manufactured according to a conventional method.

[Margins below] The size of the intermetallic compound in each of the above alloys is 5 μm.
The following fine particles were dispersed uniformly.

Next, each sample material was puff-polished to give its surface a mirror finish, and then immersed in a 5 wt % NaOH solution at a temperature of 55° C. for 3 minutes, and then neutralized and washed with water using conventional methods.

Then, for each sample material, ■Treatment liquid = 15% sulfuric acid, current density: DC 1.3A/d, bath temperature: 20±1℃, ■Treatment liquid = 3% oxalic acid, current density: AC positive IA/ dTIt
Two types of anodic oxidation treatments were performed at different treatment times at a bath temperature of 35±1° C. to form an anodic oxide film on the surface of the sample material.

Thereafter, after performing a sealing treatment with pure boiling water for 30 minutes, the film thickness of each aluminum material obtained was measured, and the external color tone was visually observed. The results are shown in Table 2 for those subjected to the above treatment (■) and in Table 3 for those subjected to the treatment (■).

[Margin below] Further, for the samples No. 2, 12, and 14 shown in each table, color tone measurement was performed using a color difference meter. The results are shown in Table 4 below. The color difference meter used was model CDE-CH-4 manufactured by Suga Test Instruments Co., Ltd. In the table, L indicates lightness, a indicates bluishness, a medium value indicates red, a - value indicates bluish green, b indicates yellow, and b indicates medium value yellow, -.
By value it is blue.

[Margin below] As can be seen from the above results, the aluminum alloy according to the present invention can produce a beautiful film with different tones such as ivory, cream, and yellow-green, and each color is uniform. I was able to confirm that.

that's all

Claims (4)

[Claims] (1) Li: 0.05~3.5wt%, Y: 0.05~
10.0wt%, La: 0.05-10.0wt%, P
r: 0.05-10.0wt%, Nd: 0.05-10
．． 0 wt %, Sm: 0.05 to 10.0 wt %, and the remainder is aluminum and unavoidable impurities. (2) Li: 0.05~3.5wt%, Y: 0.05~
10.0wt%, La: 0.05-10.0wt%, P
r: 0.05-10.0wt%, Nd: 0.05-10
．． 0 wt%, Sm: 0.05 to 10.0 wt%, and Fe: 0.05 to 1.5.
wt%, Mg: 0.05 to 7.0 wt%, Si: 0.0
5-1.5wt%, Zn: 0.05-7.0wt%, M
An aluminum alloy for coloring, characterized in that it contains one or more of n: 0.05 to 1.5 wt%, and the remainder consists of aluminum and unavoidable impurities. (3) Li: 0.05~3.5wt%, Y: 0.05~
10.0wt%, La: 0.05-10.0wt%, P
r: 0.05-10.0wt%, Nd: 0.05-10
．． 0 wt%, Sm: 0.05 to 10.0 wt%, and Cr: 0.05 to 0.5.
wt%, Zr: 0.05-0.3 wt%, Ti: 0.5
wt% or less, B: 0.1 wt% or less, V: 0.05 to 0
．． An aluminum alloy for coloring, characterized in that it contains one or more of 5 wt% of aluminum, and the remainder consists of aluminum and unavoidable impurities. (4) Li: 0.05~3.5wt%, Y: 0.05~
10.0wt%, La: 0.05-10.0wt%, P
r: 0.05-10.0wt%, Nd: 0.05-10
．． 0 wt%, Sm: 0.05 to 10.0 wt%, and Fe: 0.05 to 1.5.
wt%, Mg: 0.05 to 7.0 wt%, Si: 0.0
5-1.5wt%, Zn: 0.05-7.0wt%, M
Contains one or more of n: 0.05 to 1.5 wt%, further Cr: 0.05 to 0.5 wt%, Z
r: 0.05 to 0.3 wt%, Ti: 0.5 wt% or less, B: 0.1 wt% or less, V: 0.05 to 0.5 wt%
An aluminum alloy for coloring, characterized in that it contains one or more of the above, and the remainder consists of aluminum and unavoidable impurities.