JP2008095165A - Aluminum material or aluminum alloy material, and building material product using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aluminum material or an aluminum alloy material with a stain surface having satisfactory follow-up properties of a film/a coating film, and capable of exhibiting excellent corrosion resisting performance, and to provide a building material product using the same. <P>SOLUTION: The aluminum material or aluminum alloy material in which the surface is provided with locally deep pittings, and the skewness (Rsk) of a rough curve in the surface is controlled to -2<Rsk<-0.3 has satisfactory follow-up properties of a film/a coating film, thus can exhibit excellent corrosion resisting performance. In this way, the aluminum material or aluminum alloy material is useful for a building material product or the like. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to an aluminum material or aluminum alloy material having a satin surface that can provide good corrosion resistance and can exhibit excellent corrosion resistance, and a building material product using the same.

  Aluminum materials and aluminum alloy materials are lightweight and have excellent corrosion resistance and workability. Therefore, building materials such as windows, doors, screen doors, fences, sashes, curtain walls, panels, gates, shutters, carports, fences, etc. It is used in various fields such as landscape frames such as product frames, casings, and signboards.

In recent years, a technique for mechanically or chemically treating the surface of an aluminum material or an aluminum alloy material has been developed for the purpose of improving harmony with the surroundings or improving design properties according to the purpose of use (for example, And Patent Documents 1 to 9).
Japanese Patent No. 3558940 Japanese Patent No. 3344973 JP-A-2005-200740 JP 2001-59200 A Japanese Patent No. 3288997 JP 2003-27282 A Japanese Patent Laying-Open No. 2005-29868 JP 2005-171356 A JP-A-2005-42196

However, when the surface of the aluminum material or aluminum alloy material subjected to the satin finish is very rough (the unevenness is large), there is a problem that the throwing power of the film / coating film is poor and the corrosion resistance is inferior.
Therefore, the present invention provides an aluminum material or aluminum alloy material having a satin surface that has good throwing power of the film / coating film and can exhibit excellent corrosion resistance, and a building material product using the same. Objective.

  As a result of diligent efforts to solve the above problems, the inventors of the present invention locally provided deep pitting corrosion on the surface, and the cross-sectional distortion of the surface (skewness of the surface roughness curve: Rsk) is -2 <Rsk. <-0.3 aluminum materials and aluminum alloy materials have been found to have good coating and coating performance and can exhibit excellent corrosion resistance, and have completed the present invention.

  That is, the aluminum material or aluminum alloy material according to the present invention is characterized in that the skewness (Rsk) of the surface roughness curve is −2 <Rsk <−0.3. The aluminum material or aluminum alloy material according to the present invention preferably has Rsk of −1.5 <Rsk ≦ −0.53.

  The aluminum material or aluminum alloy material according to the present invention preferably has a surface arithmetic average roughness (Ra) of 2 μm ≦ Ra <7 μm, and particularly preferably Ra of 2.4 μm ≦ Ra ≦ 5 μm. .

  The building material product according to the present invention is characterized by using the above-described aluminum material or aluminum alloy material.

  According to the present invention, it is possible to provide an aluminum material or an aluminum alloy material having a pear surface that has good throwing power of a film / coating film and can exhibit excellent corrosion resistance, and a building material product using the same. it can.

  The form for implementing this invention completed based on the said knowledge is demonstrated in detail, giving an Example.

== Aluminum material and aluminum alloy material according to the present invention ==
As shown in the examples, excellent corrosion resistance can be obtained by providing a coating film on an aluminum material or an aluminum alloy material having a skewness (Rsk) of a surface roughness curve within a predetermined range. all right. From this, it was shown that aluminum materials and aluminum alloy materials having Rsk within a predetermined range have good throwing power of coating films and coating films and can exhibit excellent corrosion resistance.

  Therefore, the aluminum material and the aluminum alloy material according to the present invention are characterized in that the range of Rsk is −2 <Rsk <−0.3. The reason for limiting the range of Rsk as described above is that, as shown in the examples, when Rsk is −0.3 or more, the throwing power of the film / coating film is poor, and excellent corrosion resistance (according to the standard of JIS H 8602) This is because RN (rating number) greater than 9.0 cannot be exhibited in 240 hours by the cast corrosion resistance test. Moreover, it is because it is difficult to produce the surface whose Rsk is -2 or less.

  In the aluminum material and the aluminum alloy material according to the present invention, the range of Rsk is preferably −1.5 <Rsk ≦ −0.53. As shown in the examples, when Rsk is −0.53 or less, the throwing power of the film / coating film is particularly excellent, and the corrosion resistance is improved (the casting according to the standard of JIS H 8602). This is because a value of RN 9.3 or more can be exhibited in 240 hours by the corrosion resistance test. Further, as shown in the examples, when Rsk is −1.5 or less, a groove is formed substantially perpendicular to the smooth portion at the boundary between the smooth portion and the pitting portion on the surface of the substrate (aluminum or aluminum alloy). Therefore, it is considered that cracks are generated when a film is formed on the surface of the substrate.

  In the aluminum material and the aluminum alloy material according to the present invention, the range of Ra is preferably 2 μm ≦ Ra <7 μm. In this way, the lower limit is set to 2 μm, as shown in the examples, if the surface is less than 2 μm, scratches on the surface of the material can be visually confirmed, the angle dependency of brightness and the gloss ratio are large, and scratch resistance is obtained. It is because it is not possible. The reason why the upper limit is less than 7 μm is that it is difficult to produce a surface with Ra of 7 μm or more.

  The Ra range is particularly preferably 2.4 μm ≦ Ra ≦ 5 μm. This is because excellent scratch resistance can be obtained when Ra is 2.4 μm or more, as shown in the Examples. Further, if Ra is larger than 5 μm, it is considered that the surface is very rough and the throwing power of the film / coating film is deteriorated.

Here, the above-mentioned Ra represents the arithmetic average roughness of the surface. Ra is an average of absolute values of Z (x) in the measurement length l as shown in the following formula (I). In the formula (I), “Z (x)” means a surface roughness curve.

The above Rsk represents the skewness of the surface roughness (cross-section) curve, that is, the degree of the roughness in the height direction of the surface roughness curve. The + value is on the mountain side and the-value is on the valley side. It means having a rough surface. Rsk is obtained by normalizing the third moment around the mean value by the root mean square (the following formula (II)), or the mean square of Z (x) at the measurement length l It can be calculated by dividing by the cube of the square root (the following formula (III)). In the formula (II) or formula (III), “Rq” means the root mean square roughness (root mean square of Z (x) in the measurement length l), that is, the standard deviation, and “Z (x ) "Means the surface roughness curve.

  As described above, since the aluminum material and the aluminum alloy material according to the present invention have good coating and coating performance and can exhibit excellent corrosion resistance, windows, doors, screen doors, bags, sashes, It is useful for building materials such as curtain walls, panels, gates, shutters, carports, and fences, as well as for landscape materials such as frames and casings of electrical products and signs. These building materials, frames and casings of electrical products, landscape materials, etc. can be manufactured by conventional methods.

== Production Method of Aluminum Material and Aluminum Alloy Material According to the Present Invention ==
Next, the manufacturing method of the aluminum material and aluminum alloy material which concern on this invention is demonstrated.
The aluminum material and the aluminum alloy material according to the present invention, for example, after degreasing the surface of aluminum or aluminum alloy in advance, chemical matte treatment such as acid etching treatment or alkali etching treatment, or mechanical satin treatment such as blast treatment Can be obtained by performing a known satin treatment such as the above and confirming Ra and Rsk using the above formula.
In addition, when performing a chemical finish, it is preferable to perform an alkali etching process after performing an acid etching process. Further, the natural oxide film may be removed by performing an alkali etching process in advance before performing the satin treatment, but it is desirable to perform the satin treatment without performing the alkali etching process and leave the natural oxide film.
As the above-mentioned aluminum alloy, for example, existing ones such as JIS A 6063 and JIS A 1100 can be used.

  Hereinafter, the present invention will be specifically described by way of examples. These examples are for explaining the present invention, and do not limit the scope of the present invention.

[Example 1]
The degreasing aluminum alloy of JIS A 6063 is electrolyzed in an acidic electrolyte solution, and then acid etching treatment is performed, followed by immersion in a caustic soda solution, alkali etching treatment, and neutralization treatment. Each aluminum alloy material (samples No. 1 to No. 8) having a textured surface as shown was produced. The base gloss was determined by measuring the 60 ° specular gloss according to the method of measuring the specular gloss of JIS Z8741, and a handy gloss meter <Gloss Checker> IG-320 (manufactured by Horiba, Ltd.) was used as the gloss meter. .

  Next, each aluminum alloy material was anodized in a sulfuric acid bath at a voltage of 13.0 V for 30 minutes to form an oxide film, and after AC coloring in nickel solution at a voltage of 10.0 V for 60 seconds, an aluminum electrodeposition paint Was used, electrodeposition was performed at a voltage of 240 V for 120 seconds to form a coating film, and an aluminum alloy material having the coating film and the coating film was produced. Thereafter, a cast corrosion resistance test and a scratch resistance test in accordance with the method of JIS H 8681-2 were performed on the aluminum alloy material having these films and coating films. In the scratch resistance test, the surface of the aluminum alloy material having a film and a coating film was scratched by applying a load of 150 g in a vertical direction to a 0.5 mm diamond head, and then the scratch was not noticeable with the naked eye. It was evaluated by judging. In addition, the evaluation shows no difference as a result of comparing the aluminum alloy material having the smooth surface (Ra = 0.42, Rsk = 0) with an anodized coating composite film with scratches as described above. If the case is “x”, scratches are still conspicuous on the whole, but it may be inconspicuous depending on the viewing angle, and “△” indicates that the scratch is not conspicuous overall, but the scratch is clearly confirmed depending on the viewing angle The case where it was possible was marked with “◯”, and the case where scratches were hardly noticed was marked with “◎”.

Further, with respect to the aluminum alloy material having these coating films and coating films, an angle-changing color difference meter (the light source uses D65 and the color system adopts Lab-based L ^* values) is shown in FIG. Thus, when the light is incident on the surface of the material at an angle of 45 °, the angle of the light that is specularly reflected is 0 °, and the light receiving angles of 15, 25, 45, 75, and 110 ° are on the incident light side. The L ^* value (brightness) was measured for angle dependency, and the gloss ratio (ratio of the highest L ^* value to the lowest L ^* value at the measured light receiving angle) was calculated. The results are shown in Table 2, Table 3, and FIG.

  In the samples No.1 to No.6, as shown in Table 3, the RN in 240 hours is larger than 9.0, the throwing power of the coating film is good, and the excellent corrosion resistance can be exhibited. It was revealed. From this, it was found that an aluminum material or an aluminum alloy material having an Rsk of less than −0.3 has good coating and coating performance and can exhibit excellent corrosion resistance.

  In addition, as shown in Table 2 and Fig. 2, the samples No. 3 to No. 8 have low angle dependency of brightness and gloss ratio, and surface gloss, color tone, and texture can be observed from any angle. It became clear that it looked almost the same. Furthermore, as shown in Table 3, the samples No. 3 to No. 8 are excellent in scratch resistance, and in particular, the samples No. 3 to No. 6 have low Ra (that is, surface irregularities). It was revealed that scratch resistance can be exhibited (even if is small). In addition, in the sample No. 1, the angle dependency of brightness and the gloss ratio were large, and scratches on the surface of the material could be visually confirmed, and it was revealed that scratch resistance could not be obtained. From these, it was found that Ra is preferably 2 μm or more, particularly preferably 2.4 μm or more from the viewpoint of scratch resistance.

[Example 2]
Next, the degreased JIS A 6063 aluminum alloy is immersed in a caustic soda solution to remove the natural oxide film, and then immersed in each solution in the order of an acid solution and a caustic soda solution, followed by an etching treatment, followed by a neutralization treatment. Each of the aluminum alloy materials (samples No. 9 to No. 17) having a textured surface as shown in Table 4 was prepared.

Next, each aluminum alloy material was anodized in a sulfuric acid bath at a voltage of 13.0 V for 30 minutes to form an oxide film, and after AC coloring in nickel solution at a voltage of 10.0 V for 60 seconds, an aluminum electrodeposition paint Was used, electrodeposition was performed at a voltage of 240 V for 120 seconds to form a coating film, and an aluminum alloy material having the coating film and the coating film was produced. Thereafter, a cast corrosion resistance test was performed on the aluminum alloy material having these films and coating films in the same manner as in the method described in Example 1. Moreover, it was confirmed whether the surface of each aluminum alloy material which has a film and a coating film has cracked. The results are shown in Table 5.

  As shown in Table 5, in the samples No. 9 to No. 17, the RN in 240 hours is 9.3 or more, the covering property of the film / coating film is good, and the excellent corrosion resistance can be exhibited. Became clear. From this, it was found that the aluminum material or aluminum alloy material having Rsk of −0.53 or less has particularly excellent throwing power of the coating film / coating film and can exhibit more excellent corrosion resistance.

In one Example of this invention, it is a figure for demonstrating the light reception angle which measured the L ^* value when light was incident on the material surface at an angle of 45 degrees using the gonometric color difference meter. . In one Example of this invention, it is a figure which shows the result of having investigated the angle dependence of L ^* value using the gonio-type color difference meter.

Claims (5)

  An aluminum material or an aluminum alloy material characterized in that the skewness (Rsk) of the surface roughness curve is -2 <Rsk <-0.3.   The aluminum material or aluminum alloy material according to claim 1, wherein Rsk is −1.5 <Rsk ≦ −0.53.   3. The aluminum material or aluminum alloy material according to claim 1, wherein the arithmetic average roughness (Ra) of the surface is 2 μm ≦ Ra <7 μm.   The aluminum material or aluminum alloy material according to claim 3, wherein Ra satisfies 2.4 μm ≦ Ra ≦ 5 μm.   A building material product using the aluminum material or aluminum alloy material according to any one of claims 1 to 4.

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