JPH0433860B2 - - Google Patents

Description

[Detailed description of the invention]

Industrial Application Fields 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. Concerning aluminum alloys used in OA equipment parts, etc. BACKGROUND TECHNOLOGY Conventionally, a corrosion-resistant anodic oxide film exhibiting various colors on the surface has been produced by anodizing an aluminum alloy containing a color-forming element (for example, 11529
Special Publication No. 49-16341, Special Publication No. 12301, Special Publication No. 56-12301, Special Publication No. 56-31359, Special Publication No. 57-20400, Special Publication No. 61
−20617, etc.). Problems to be Solved by the Invention However, with these conventional aluminum alloys, the color tone of the film obtained by anodizing is limited to a single color such as milky white or an approximate color such as gray or black. It has not been possible to obtain coatings with various coloring states that have completely different color tones using aluminum alloys. The present invention was made in view of the above circumstances, and it is an object of the present invention to provide a color-forming aluminum alloy that can produce an oxide film exhibiting different color tones by anodizing treatment. Means for Solving the ProblemsThe first aspect of this invention is that Ni: 1.0~
It is an aluminum alloy for color forming characterized by containing 10.0wt% of Ni, and the remainder consisting of aluminum and unavoidable impurities.The second one is Ni: 1.0~
Contains 10.0wt%, further Mg: 0.05-7.0wt%,
Si: 0.05~1.5wt%, Zn: 0.05~7.0wt%, Mn:
This is a color-forming aluminum alloy characterized by containing one or more of Ni: 0.05 to 1.5 wt%, with the balance consisting of aluminum and unavoidable impurities, and the third one is Ni: 1.0 to 10.0 wt%. Contains
Furthermore, Cr: 0.05~05wt%, Zr: 0.05~0.3wt%,
Ti: 0.5wt% or less, B: 0.1wt% or less, V: 0.05~
Contains one or more of 0.5wt%,
It is an aluminum alloy for color development characterized by consisting of the balance aluminum and unavoidable impurities, and the fourth one contains Ni: 1.0 to 10.0 wt%, further Mg: 0.05 to 7.0 wt%, and Si: 0.05 to 1.5 wt%,
Contains one or more of Zn: 0.05 to 7.0 wt%, Mn: 0.05 to 1.5 wt%, and further Cr: 0.05
~0.5wt%, Zr: 0.05~0.3wt%, Ti: 0.5wt% or less, B: 0.1wt% or less, V: 0.05~0.5wt%, and the balance is aluminum and This is a colored aluminum alloy characterized by consisting of unavoidable impurities. In the above aluminum alloy, Ni is contained in the aluminum, so that when the aluminum alloy is anodized,
It has the effect of producing an oxide film with different colors depending on the conditions of the anodizing treatment. However, if the content is less than 1.0wt%, the above effects will be poor;
If the content exceeds 10.0wt%, the color tone will become uneven. The preferred Ni content range is 2.0 to 6.0wt
%. Mg, Si, Zn, and Mn all have the effect of improving the strength of the alloy without impairing the above-mentioned effect of adding Ni. However, the content of Mg: less than 0.05wt%,
Si: less than 0.05wt%, Zn: less than 0.05wt%, Mn:
There is no such effect at less than 0.05wt%, and conversely, Mg: 7.0wt
%, Si: more than 1.5 wt%, Zn: more than 7.0 wt%, Mn: more than 1.5 wt%, resulting in the disadvantage of forming coarse intermetallic compounds. The preferred content range is Mg: 0.5-2.0wt%;
Si: 0.5-1.0wt%, Zn: 4.0-7.0wt%, Mn: 0.5
~1.0wt%. Cr, Zr, Ti, B, and V contribute to improvement of various properties such as refinement of alloy crystal grains and prevention of casting cracks without impairing the effect of adding Ni. However, the content is Cr: less than 0.05wt%, Zr: 0.05wt
%, V: less than 0.05wt%, or when there is no content of Ti or B, the above effect is not obtained, and conversely, Cr:
More than 0.5wt%, Zr: more than 0.3wt%, Ti: 0.5wt
%, B: more than 0.1 wt%, and V: more than 0.5 wt%, the disadvantage is that coarse intermetallic compounds are formed. Various color tones of the oxide film obtained by subjecting the above aluminum alloy to anodizing treatment can be obtained by changing treatment conditions such as the type of treatment solution, electrolysis time, and current density. For example, in the case of direct current electrolysis using a sulfuric acid-based treatment liquid, if the treatment time is short, that is, if the coating thickness is thin, the coating will appear pale grayish white or milky white, and if the treatment time is prolonged, the coating will become grayish black. 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, and then mustard-colored. However, in this invention, the conditions for such anodic oxidation treatment are not particularly limited. Effects of the Invention As described above, this invention is a Ni-containing aluminum alloy, and as will be clear from consideration of the Examples described later, even if the aluminum alloy is No. 1, the anodizing treatment conditions can be changed. This makes it possible to produce a beautiful, glossy film with different tones, such as milky white, grayish black, and mustard yellow. Therefore, it is used as an aluminum material with excellent appearance color for decorative, architectural, and
It can be suitably used for OA equipment parts, etc., and its range of application can be significantly expanded. Further, the aluminum alloy according to the second invention, which contains one or more of Mg, Si, and Mn in a predetermined range in addition to Ni, can have excellent mechanical strength in addition to the above effects. . Also
In addition to Ni, one or two of Cr, Zr, Ti, B, and V
The aluminum alloy according to the third aspect of the present invention, which contains at least one of the above-mentioned types within a predetermined range, has fine crystal grains in addition to the above color tone effect, and can be made into an aluminum alloy without casting cracks. In addition to Ni, one or more of Mg, Si, Zn, Mn, and Cr, Zr, Ti,
The aluminum alloy according to the fourth invention, which contains one or more of B and V in a predetermined range, can be an aluminum alloy that has the effect of improving strength, refining grains, and preventing casting cracks in addition to the above color tone effect. . Embodiments Next, embodiments of the present invention will be described.

[Table] 50 mm long and wide, consisting of various compositions shown in Table 1 above.
Multiple pieces of extruded material with a thickness of 100 mm and a wall thickness of 1.5 mm were prepared as test materials. Each sample was buffed to give a mirror finish to its surface, and then chemically polished by immersing it in a phosphoric acid + nitric acid solution at a temperature of 100±3° C. for 2 minutes. Then, for each sample material, treatment liquid: 15% sulfuric acid, current density: DC 1.3A/
^dm2 , temperature: 20℃, treatment liquid: 3% oxalic acid, current density: DC 1.3A/
dm ² , bath temperature: 35℃, treatment liquid: 3% oxalic acid, current density: AC positive
1A/ ^dm2 . Three types of anodic oxidation treatments were performed at negative 0.33 A/dm ² and bath temperature: 35° C. with different treatment times to form an anodic oxide film on the surface of the test material. Thereafter, the holes were sealed with boiling pure water for 30 minutes, and then 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 processing, and in Table 3 for those subjected to the above processing.
Table 4 shows the results of the treatments shown in Table 4.

【table】

【table】

【table】

【table】

[Table] In addition, for Samples No. 5, 9, and 12 shown in each table, color tone measurements were performed using a color difference meter. The results are shown in Table 5 below. The color difference meter used was Model CDE-CH-4 manufactured by Suga Test Instruments Co., Ltd. In addition, in the table, L indicates lightness, a indicates bluishness, and a indicates +
The value is red, and the negative value is blue-green. b indicates yellowness. When b is +, it is yellow, and when b is negative, it is blue.

【table】

[Table] As can be seen from the above results, it was confirmed that the aluminum alloy according to the present invention can produce films with different tones such as milky white, grayish black, and mustard yellow.

Claims (1)

[Claims] 1. An aluminum alloy for coloring, characterized in that it contains 1.0 to 10.0 wt% of Ni, and the remainder consists of aluminum and unavoidable impurities. 2 Contains Ni: 1.0 to 10.0wt%, and further contains Mg:
0.05~7.0wt%, Si: 0.05~1.5wt%, Zn: 0.05~
7.0wt%, Mn: 0.05 to 1.5wt%, one or more of them, and the remainder consists of aluminum and inevitable impurities. 3 Contains Ni: 1.0 to 10.0wt%, and further contains Cr:
0.05~0.5wt%, Zr: 0.05~0.3wt%, Ti: 0.5wt
% or less, B: 0.1 wt% or less, V: 0.05 to 0.5 wt%, and the remainder is aluminum and inevitable impurities. 4 Contains Ni: 1.0 to 10.0wt%, and further contains Mg:
0.05~7.0wt%, Si: 0.05~1.5wt%, Zn: 0.05~
Contains one or more of 7.0wt%, Mn: 0.05 to 1.5wt%, and further Cr: 0.05 to 0.5wt%,
Zr: 0.05-0.3wt%, Ti: 0.5wt% or less, B:
1. An aluminum alloy for coloring, characterized in that it contains one or more of the following: 0.1 wt% or less, V: 0.05 to 0.5 wt%, and the remainder consisting of aluminum and inevitable impurities.