JPH03247775A - Colored aluminum member and its production - Google Patents

Abstract

PURPOSE:To produce a colored Al member capable of maintaining its color tone over a long period by immersing an Al member into hot water containing carbonate ions, etc., and coloring the surface of this Al member into the desired color tone in the achromatic color arrangement of the Munsell color system. CONSTITUTION:An Al member is immersed into hot water containing at least one anion selected from the group consisting of carbonate ion, silicate ion, sulfate ion, phosphate acid ion, nitrate ion, and chlorine ion, by which the surface of the Al member is colored into the desired color tone in the achromatic color arrangement of the Munsell color system. At this time, anion content in the hot water is regulated to about 5-200ppm based on the whole, and pH of the hot water, temp., and immersion time are regulated to about 7-11, about 80-100 deg.C, and about 2-10min, respectively, and further, it is preferable that the surface is previously roughened prior to immersion treatment. The color tone formed by this method can be maintained over a long period and superior hydrophilic property can be provided, and, as a result, this member is useful for transmission line and its accessories.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a colored aluminum member whose surface is colored in an achromatic color according to the Munsell color chart system, and a method for manufacturing the same. This invention relates to an aluminum power transmission line with a harmonious dark tone, accessories such as spiral rods and jumper devices used in the overhead line, and a method for manufacturing the same.

(Prior Art) Generally, the surface of an aluminum member is silvery white and has a very high reflectance to light. Among these aluminum members, for example, aluminum power transmission lines and spiral rods and jumper devices used when connecting them have traditionally been roughened by sandblasting on the surface in order to harmonize with the overhead line environment. chemical treatment,
The surface is coated with paint, etc.

By applying such a treatment, the light reflectivity on the surface of the aluminum transmission line and its accessories is reduced, and harmony with the overhead line environment is achieved.

(Problems to be Solved by the Invention) However, in the case of the above-described sandblasting treatment, it is difficult to darken the color tone of the treated surface of the obtained aluminum power transmission line and its accessories. Therefore, the surface color tone cannot be harmonized with the overhead wire environment.

In addition, in the case of painting, it is not possible to maintain the color tone and brightness of the surface coating film formed over a long period of time, and the hydrophilicity of the surface is hindered, resulting in water droplets adhering to the surface. Based on the corona discharge that occurs, the problem of increasing the optical noise is unavoidable.

The present invention does not cause the above-mentioned problems, has a dark color tone on the surface, has a desired color tone (Munsell display lightness is 5 or less) in the achromatic color array of the Munsell color chart system, and has a dark color tone. The object of the present invention is to provide a colored aluminum member whose color tone is maintained over a long period of time, particularly an aluminum power transmission line and its accessories having a color tone that harmonizes with the overhead line environment, and a method for manufacturing the same.

(Means/effects for solving the problem) In order to achieve the above object, the present invention is characterized in that the surface color tone is colored to a desired color tone in the achromatic color array of the Munsell color chart system. A colored aluminum member is provided, and the aluminum member is coated with carbonate ions and silicate ions.

The surface of the aluminum member is immersed in hot water containing at least one anion selected from the group of sulfate ions, phosphate ions, nitrate ions, and chloride ions, so that the surface of the aluminum member is colored in an achromatic color array based on the Munsell color chart. A method for manufacturing a colored aluminum member is provided, which is characterized by coloring the member to a desired color tone.

On the colored aluminum part side of the present invention, if it is an aluminum power transmission line and its accessories, the color tone of the surface can be adjusted to any brightness and darkened.
It can harmonize with the overhead line environment, and its colored surface has excellent weather resistance and its effect is maintained over a long period of time.It also has good hydrophilic properties, so it adheres to the surface of power transmission lines. Based on corona discharge caused by water droplets (audible noise can be reduced).

Such surface coloring treatment can be easily achieved by immersing the aluminum member in hot water, which will be described later.

The hot water used contains carbonate ions and silicate ions.

One or more of sulfate ions, phosphate ions, nitrate ions, and chloride ions are contained.

These anions act on the hydrated oxide formed on the surface of the aluminum member, turning it blackish (discolored).

If the content of these anions is too low, the above-mentioned effects will not be fully exerted, and the surface color of the aluminum member will not become dark after treatment, and if the content is too high, hydration oxidation of the aluminum member surface will occur. The total content is preferably about 5 to 200 ppm since the problem of hindering the production of products and reducing the coloring effect begins to occur.

As a source of these metal ions, for example, CaCO
3. Carbonates such as BaCO3, NazC03; Naz
Silicates such as O@S ich, K2O・S 1C)z; ZnSO4, FeSO4, Cu5O,, Ca
Sulfates like SO4; KH2PO,, Na3PO4,
Phosphates like BaHPO4: Ca(N(L+)2
．． Nitrates such as NaNO3, Fe(NO3)2; N
Chlorides such as aCCKC (1, FeC (22) can be mentioned. Each of these salts may be dissolved in hot water so that each anion has a predetermined concentration. At this time, each salt dissociates in hot water, and the sodium ions, potassium ions, calcium ions, magnesium ions, iron ions, copper ions, zinc ions, etc. that are generated at that time also have a good effect on surface coloring along with each anion.

It is effective to add additives such as aqueous ammonia or triethanolamine to the hot water because it can reduce the lightness of the surface color. As for the amount of ammonia water added, for example, in the case of 28% ammonia water,
It may be about 0.1 to 1.5% by volume, and in the case of triethanolamine, about 0.1 to 1.0% by weight.

Furthermore, it is preferable that the pH of the hot water is adjusted to 7-11. This is because if the pH of the hot water is outside the above range, the time required for surface coloring becomes longer and at the same time it is difficult to form a dark-toned surface.

The temperature of hot water is controlled at 80-100°C. If the temperature of this hot water is lower than 80 degrees Celsius, the time required for coloring becomes longer and it is not practical, and the brightness of the surface after treatment becomes too large. This is because if there is, the harmony with the overhead line environment will deteriorate. A preferred state of the hot water is a boiling state. At this time, the surface of the treated aluminum member becomes dark in color in a short time.

Furthermore, if the surface of the aluminum member is roughened in advance by, for example, sandblasting, the surface of the aluminum member is roughened before immersion in hot water, and the sandblasting removes oil and other substances adhering to the surface. This is preferable because it facilitates the realization of a surface state with various color tone and brightness, and the obtained surface has good hydrophilicity.

Furthermore, if the aluminum member is immersed in hot water for too short a time, the surface color change will be insufficient, and if the aluminum member is immersed in hot water for too long, it will only reduce productivity, so it is usually about 2 to 10 minutes. It is preferable that

(Examples of the Invention) Example 1 A colored aluminum power transmission line of the present invention was manufactured using an aluminum power transmission line as an aluminum member using the manufacturing line illustrated in FIG.

First, in this production line, sandblasting is carried out between the supply 1, in which the aluminum power transmission line to be surface treated (Munsell display brightness 7.2) is wound, and the coiler 5, which winds the aluminum power transmission line after the treatment. Device 2.
Induction heating device 3. The hot water treatment tanks 4 are arranged in this order,
Aluminum power transmission line a is connected from supply 1 to sandblasting device 2° to induction heating device 3. It sequentially passes through a hot water treatment tank 4 and is wound around a coiler 5.

Inside the hot water treatment tank 4, 250pp of Na2O・Sio
m.

CaCO3200ppm, triethanolamine 0.
It is filled with boiling water (100°C) in which 5% by weight is dissolved and the pH is adjusted to lO.

In this line, an aluminum power transmission line a is pulled out from a supply l, passed through a sandblasting device 2 to roughen the surface, and then passed through an induction heating device 3 to heat the power transmission line to a temperature of 90%.
After heating to ℃, treated in hot water treatment tank 4 for 10 minutes,
It was wound up with coiler 5.

The surface color of the obtained aluminum power transmission line was dark gray, and its Munsell brightness was 3.5.

The obtained aluminum power transmission line was then exposed outdoors for one year, and the wettability and spreadability of rain water droplets and changes in color tone during that time were investigated, and both were found to be very stable, unchanged from immediately after coloring. .

Example 2 Example 1 except that the hot water contains 450 ppm of Na5P and 0.5% by weight of triethanolamine.
The surface of an aluminum power transmission line was treated in the same manner.

The surface color is gray-black, and its Munsell brightness is 4.
．． It became 0.

In the same manner as in Example 1, the wettability and spreadability of rainwater droplets and changes in color tone were investigated. There was no change from the state immediately after coloring.

Example 3 An aluminum power transmission line was surface treated in the same manner as in Example 1, except that the hot water contained 100 ppm of H2SO4 and 0.5% by weight of triethanolamine.

The color tone of the obtained surface was gray-black, and its Munsell value was 4.5.

Regarding the obtained aluminum power transmission line, in the same manner as in Example 1, the wettability and spreadability of rain water droplets on the surface and color tone change were investigated. There was no difference from immediately after coloring.

Example 4 The same treatment as in Example 3 was carried out, except that the sandblasting treatment was not performed.

The formed surface had a color tone change, but it was in the form of spots and the Munsell display brightness was 5.8 to 6.
．． It was large at 2, and it wasn't -like.

Example 5 The temperature of the hot water used in Example 1 was changed as shown in Table 1.
．． 2) was processed and the state of color development on the surface was examined. The results are shown in Table 1.

(Margin) Table ■ As is clear from Table 1, when the temperature of hot water decreases,
The Munsell display brightness increases.

Example 6 The pH of the hot water used in Example 3 was adjusted to the value shown in Table 2, and the aluminum power transmission line was boiled therein in the same manner as in Example 3 to check the coloring state of the aluminum power transmission line. Examined.

The results are shown in Table 2.

(The following is a margin.) As is clear from Table 2, when the pH value of the hot water is out of the range of 7 to 11, the Munsell brightness of the obtained aluminum power transmission line increases.

Comparative Example 1 The surface of an aluminum power transmission line was treated in the same manner as in Example 1, except that 0.5% by weight of triethanolamine was contained in the hot water. The surface color of the obtained aluminum power transmission line is light gray, and its Munsell display brightness is 6.
．． It was 5.

(Effects of the Invention) As is clear from the above explanation, according to the method of the present invention, the color tone of the surface of an aluminum member can be made into any color tone in the achromatic color array of the Manse 24° color chart system. When applied to aluminum transmission lines and their accessories, they can be given a surface condition that easily blends into the overhead line environment. In addition, the formed color tone is maintained over a long period of time and has good hydrophilicity, so that in aluminum power transmission lines, o-diple noise due to corona discharge caused by attached water droplets is reduced.

In addition, since this method only requires immersing the aluminum parts in hot water, it is an extremely simple surface coloring method for aluminum parts.For example, in the case of aluminum power transmission lines and their accessories, high productivity and low cost are possible. It is useful to be able to manufacture aluminum power transmission lines and their accessories that are in harmony with the overhead line environment.

[Brief explanation of drawings]

FIG. 1 is an example of a manufacturing line used when manufacturing colored aluminum power transmission lines by the method of the present invention.

Claims (6)

[Claims] (1) A colored aluminum member characterized in that the surface color tone is colored to a desired color tone in the achromatic color array of the Munsell color chart system. (2) The colored aluminum member according to claim 1, wherein the colored aluminum member is an aluminum power transmission line and its accessories. (3) The aluminum member is immersed in hot water containing at least one anion selected from the group of carbonate ions, silicate ions, sulfate ions, phosphate ions, nitrate ions, and chloride ions. A method for manufacturing a colored aluminum member, which comprises coloring the surface of the aluminum member in a desired color tone in an achromatic color array based on the Munsell color chart. (4) The method for producing a colored aluminum member according to claim 3, wherein the anion source is at least one selected from the group of carbonates, silicates, sulfates, phosphates, nitrates, and chlorides. (5) The method for manufacturing a colored aluminum member according to claim 3, wherein the surface of the aluminum member is roughened prior to immersion in the hot water. (6) The method for manufacturing a colored aluminum member according to any one of claims 3 to 5, wherein the aluminum member is an aluminum power transmission line and its accessories.