JPS6029492A - Patterned surface treatment method for aluminum alloy - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention provides surface treatment capabilities capable of vividly producing various decorative patterns such as woodgrain and printed patterns on the surface of aluminum alloys (excluding pure aluminum) that have age-hardening performance. More specifically, by skillfully combining mechanical operations, complete age hardening treatment operations, and electrochemical operations on the surface of aluminum alloys, the surface of aluminum alloys can be formed in an extremely simple manner. The patterning of aluminum alloys, which can produce beautiful colored patterns that reduce the difference in shading and which can form a corrosion-resistant colored film, is related to a surface treatment method.

Conventional technology and its problems Conventionally, a method for producing colored patterns on the surface of aluminum foil by fully utilizing artificial aging hardening treatment was disclosed in Japanese Patent Application Laid-open No. 53
-839A No. 1 is known.

This technology involves attaching a desired patterned sheet to the surface of an aluminum material, subjecting it to artificial age hardening under normal conditions, removing the patterned sheet before or after cooling, and then anodizing the aluminum material. This is a method of producing a colored pattern on the surface of an aluminum material by performing electrolytic coloring treatment. The generation mechanism of the colored pattern in this method is that during the age hardening treatment, heating causes a difference in the crystal structure between the areas where the patterned sheet is attached to the aluminum material and the area where it is not attached. It creates a pattern during electrolytic coloring.

However, this technique has the following drawbacks.

α) The temperature inside the age hardening furnace is not necessarily uniform between the left and right, top and bottom, front and rear ends and the center, and there are temperature differences, making it difficult to control the pattern of the resulting product.

b) Aluminum material has very good heat conduction, so
It is difficult to calculate the temperature difference between the attached part of the patterned sheet and the unattached part. Therefore, it is difficult to produce a colored pattern with a clear difference in shading, and it is also difficult to make small patterns such as spots, polka dots, and woodgrain patterns appear on an all-aluminum material.

C) The process of attaching and detaching the patterned sheet is required, and a patterned sheet must be prepared for each shape of the extruded shape, so the workability is extremely poor and the resulting product is poor. The cost will be high.

Furthermore, as another method for forming a patterned oxide film, the method described in Japanese Patent Publication No. 43-6365 is known. This technology uses an aluminum alloy with a specially selected composition of AL-Jin, -My alloy, expands the aluminum alloy, and performs special heat treatment during or after the cutting process. After that, the aluminium is anodized.

This is a method of producing a contrasting black and white pattern on the surface of the aluminum alloy due to the precipitation of the /Lt-Mn binary compound.

The patterns obtained by this method are completely random in form, and it is not possible to obtain arbitrary patterns, and the patterns are also limited to the contrast between black and white, so it is still difficult to obtain decorative and beautiful colored patterns. There is no defective money.

OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to provide a surface treatment method for patterning aluminum alloy, which is easy to work with and can produce a beautiful wood grain pattern and a desired colored pattern on the surface of the aluminum alloy. be.

Another object of the present invention, in relation to the above object, is to produce a colored pattern with excellent A1 performance such as corrosion resistance, weather resistance, and abrasion resistance, and to have good color contrast with different shading, and to form a colored pattern on aluminum alloy. The purpose of the present invention is to provide a surface treatment method for patterning aluminum alloys that can mechanically harden, particularly harden, a series of steps with high productivity and energy efficiency.

Structure of the Invention The present invention provides a method in which, instead of the conventional complete age hardening treatment after extrusion molding, the complete age hardening treatment is performed after mechanically applying a base pattern to the extrusion molded aluminum miniram alloy. Furthermore, by completely forming an anodized film by alternating current electrolysis and a colored film by electrochemical operation on the aluminum alloy, the base pattern part and the back g (other than the base pattern part) are This is based on the knowledge that a difference in coloring occurs between the aluminum alloy and the aluminum alloy, and the base pattern is clearly expressed on the surface of the aluminum alloy; f), jl).

Furthermore, this is based on the knowledge that by adding a step of modifying the oxide film before the colored film forming step, it is possible to further improve the colored pattern to be extremely clear with a difference in shading.

That is, the first invention according to the present invention is as follows: (1) applying a base pattern to the aluminum alloy surface K81 after extrusion molding by mechanical manipulation; After that, an anodic oxide film is formed on the aluminum alloy by alternating current electrolysis, and then (c) the film is colored.

Moreover, the second invention according to the present invention provides that, instead of the steps of the first invention, after each step of (1), (J)-
1) Subsequently, the anodic oxide film is modified by applying a current in an inorganic acid and/or organic acid bath, and (D-2) a coloring treatment is applied to the film. be.

Furthermore, in the third invention according to the present invention, in place of the step of the first invention, after each step of (C'l), (D'-+) is followed by an inorganic acid and/or Alternatively, a configuration is adopted in which the oxide film is modified by direct current electrolysis connected to the aluminum alloy all cathodes in an organic acid bath, and then (D'-2) coloring treatment is performed.

Aspects of the Invention Next, each step of the present invention and its aspects will be explained in detail.

(Additional background pattern formation process First, after extrusion molding (it may be an extruded shape at a high temperature of about 500 to 580°C immediately after extrusion, or it may be an extruded shape at room temperature that has been cooled after extrusion), the aluminum alloy (hereinafter referred to as aluminum (hereinafter referred to as "alloy" for short) is subjected to a base pattern by mechanical manipulation.Mechanical manipulation includes all operations other than chemical treatment, such as etching with acid or alkali.

This base pattern can be created using, for example, the plasto method in which sand, iron powder, etc. are sprayed, the high-pressure injection method in which water or other liquid is injected at high pressure, the brush method in which the aluminum alloy surface is scratched with a brush, and the laser beam method in which the surface of the aluminum alloy is irradiated with a laser beam. It is applied to the aluminum alloy surface by various mechanical operation means such as a roller method using an embossing plate roll, and a press method using a die press.

I would like to explain more specifically, for example, aiming to improve workability,
Immediately after extruding the aluminum alloy, a mold or metal frame (jig) that has the same shape as the extrusion mold and has a certain clearance is provided with injection grooves (holes) for high-pressure injection, for example at straight-grain intervals, and water or Continuous surface conditioning while spraying abrasives, etc.
By applying a base pattern (applying a base pattern), it is possible to create a base pattern even on complex-shaped irregularities. In this case, a desired continuous pattern (for example, a pattern with long straight grain intervals as in printing, a pattern with varying shading, etc.) can be easily provided. In addition, instead of the above-mentioned high-pressure injection, metal or ceramic claw-shaped jigs are all disposed inside the mold or metal frame disposed after the extrusion mold, for example, at straight-grained intervals, and extrusion is performed using foot pressure. A method of rubbing the entire shaped material after molding can also be adopted.

In addition, after cooling the extruded aluminum alloy shape, it can be stamped into any desired pattern using a device that gives scratches or distortions, such as an embossing plate roll, so that the shape can be straight-grained, plate-grained, etc.
Desired patterns such as letters and pictures can be easily formed, and the decorativeness can be improved. In the case of panels, the tongue can also be stamped using a mold press, making it possible to give any complex pattern.

In addition, as a mutual effect method with the shape of the shape, by adding a pattern of irregularities to the shape itself during the extrusion molding stage, and then rubbing the surface with metal, ceramic, carbon, etc. immediately after extrusion or after cooling. You can also add patterns.

The means for forming the base pattern is not limited to the above methods, but any method may be used as long as it can form a decorative pattern on the surface of the aluminum alloy profile using a method with good workability.

The formation of this base pattern is due to the interaction of the subsequent complete age hardening treatment, AC anodizing treatment, and electrochemical coloring treatment, and it becomes the base or nucleus for the appearance of the colored pattern9. The deep concave part is not an essential element for surface A alignment (base pattern formation), but it is sufficient to have a die mark within the range that passes the appearance, and even after the oxide film is formed, it is difficult to observe with a microscope. However, the deterioration in performance due to these scratches is to such an extent that it cannot be recognized at all. Further, the same applies to the parts where distortion is applied, and there is no deterioration in performance at all.

(U Complete Age Hardening Treatment Step As mentioned above, after forming a base pattern on the aluminum alloy after extrusion molding by mechanical operation, a complete age hardening treatment is then performed.

To explain the age hardening treatment, for example, in the case of aluminum alloy A-60635 material, the influence of age hardening temperature and time on the hardness of the alloy is shown in FIG. That is, the hardness reaches its maximum value after a certain period of time at any temperature, and age hardening at this stage is defined as complete age hardening.

Therefore, the term "complete age hardening treatment" as used in the present invention means the age hardening treatment until the maximum hardness is achieved at a certain age hardening treatment temperature.

As is clear from FIG. 1, the higher the treatment temperature, the shorter the treatment time until complete aging, and the lower the treatment temperature, the longer the treatment time. Furthermore, depending on the material of the aluminum alloy and the processing temperature, once the hardness reaches full aging, the hardness tends to decrease as the processing time increases, so the optimum conditions may be set depending on the material of the aluminum alloy.

Although the conditions for the complete age hardening treatment vary depending on the material of the aluminum alloy, it is generally recommended to carry out the treatment at a temperature of 170 to 250° C. for 0.5 to 10 hours. An example of the appropriate range of time and temperature for complete age hardening treatment (for A-60635 alloy) is shown in FIG. The area inside the diagonal line is q',,v
preferred.

(Anodic oxide film formation process by 0 AC electrolysis) The aluminum alloy gold that has gone through each of the above steps is degreased, washed with water, and smut removed as necessary, and then subjected to anodization treatment by well-known AC electrolysis. to completely form an oxide film.

That is, electrolytes containing well-known inorganic acid and/or organic acid electrolytes, such as sulfuric acid, chromic acid, phosphoric acid, etc., mixed acids thereof, oxalic acid, malonic acid, etc., or mixed acids with these or inorganic acids, etc. The aluminum alloy is anodized in a liquid using an alternating current or similar current waveform. The applied voltage and application time for anodizing treatment are the same as the usual method, but it is preferable to use 5 to 60 V for 10
Run for a minute to an hour.

As anodizing treatment, a method of connecting an aluminum alloy to an anode and subjecting it to direct current electrolysis is well known, but as in the first aspect of the present invention, complete age hardening treatment [ 7. A series of steps of subsequent anodic oxidation followed by electrolytic coloring. On the other hand, if anodization treatment is performed by alternating current electrolysis as anodic oxidation in the above series of steps,
The underlying pattern appears as a clear colored pattern.

The theoretical basis for such a phenomenon is that although it is not necessarily a bright anodic oxidation process, in the case of anodic oxidation treatment by flowing electrolysis, the melting
As the oxidation degree IIψ is formed by repeated precipitation, there is a difference in the precipitation rate and properties of the oxide film between the scratches and distortions of the aluminum alloy as the base pattern and other parts, and this causes a difference in the subsequent electrolytic coloring. It is presumed that a difference in color shading occurs between the base pattern part and the background (parts other than the base pattern part), and the base pattern appears as a clearly colored pattern.

(2) Coloring treatment process As described above, the aluminum alloy on which the anodic oxide film has been formed by AC electrolysis is then subjected to AC or DC cathodic electrolysis in an electrolytic solution containing an inorganic metal salt to form a glossy film. Examples of inorganic metal salts include sulfates, hydrochlorides, oxalates, tartrates, chromates of evanickel, cobalt, chromium, copper, cadmium, titanium, manganese, molybdenum, tin, magnesium, silver, lead, etc. Various conventionally known raw salts such as phosphate salts can be used, and as for the electrolytic conditions, conventional energization is sufficient.

Through this coloring treatment, a colored film with excellent corrosion resistance, weather resistance, and various other properties is formed on the aluminum alloy surface, and the base pattern portion (scratches or distortion portions) is removed from the background ('@
The color is darker than the strong part of the aluminum alloy, and the base pattern applied to the aluminum alloy surface by mechanical operation is exposed as a colored pattern.

The aluminum alloy that has been colored in this way is painted and baked as necessary.

The second and third inventions of the present invention are to modify the oxide film generated by the anodizing treatment using the cross R16 solution of the <CI process, prior to the coloring treatment step (1) of the first invention. Depending on the difference in this oxide film modification treatment, it can be divided into the following two methods.

That is, the aluminum alloy on which the anodic oxide film has been formed after passing through each of the steps (, () to ((,)) is then subjected to AC electrolysis [7] in an inorganic acid and/or M wall acid bath. After modifying the anodic oxide film, (D-2)
A method of coloring the film (second invention), and after forming an anodic oxide film by AC electrolysis, IJ'-1') followed by the above treatment in an inorganic acid and/or F'iM malic acid bath. This is a method (invention of vJ3) in which the aluminum alloy is connected to the cathode and the oxide film is modified by direct current ↑L, and then (D'-2) coloring treatment is applied.

The above (D-+) and (D'-+) oxide film modification treatments are not necessarily essential as in the first invention, but are steps performed for the purpose of sharpening the contrast of the pattern. . In other words, the above-mentioned coloring treatment (h) itself may be sufficient in some cases, but it is better to perform treatment under workable conditions, improve decorativeness, and perform oxide film modification treatment.

This condition may be the same electrolyte as the electrolyte used in (C') anodizing treatment, or a different electrolyte to which additives such as metal salts have been added, but this electrolyte may have an alternating current or an effect equivalent to that of the electrolyte. Electrolytic treatment with a certain waveform or cathodic direct current electrolysis.

Each method will be explained below.

(D-+) Alternating current electrolytic reforming method Inorganic acids such as sulfuric acid, phosphoric acid, chromic acid, or organic acids such as oxalic acid are applied to an aluminum alloy in an electrolytic solution using alternating current or an electric current having properties equivalent to this. By energizing the waveform, the oxide film is completely modified. The electrolytic conditions may be the same as conventional methods, but preferably the electrolysis is carried out at 5 to 30 V for 1 to 30 minutes.

This secondary anodic oxidation treatment by alternating current electrolysis is not intended to produce a colored film, but to generate and modify an oxide film in conjunction with the oxide film treatment described above.

Due to the formation of this modified film, the colored pattern formed by the subsequent coloring treatment has a noticeable difference in color shading between the base pattern portion and the background, and the contrast of the colored pattern becomes clearer.

(D'-4) Cathode Direct Current Electrolysis In an electrolytic solution consisting of an inorganic acid such as modified sulfuric acid or phosphoric acid, the aluminum alloy on which the oxide film has been formed is connected to the cathode and subjected to direct current or equivalent electrolysis. Using all current waveforms with properties kM,
The aluminum alloy is completely vented.

This current treatment causes a dissolution effect on the oxide film on the aluminum alloy surface, but at this time, the amount of current flowing between the base pattern and other parts (background) is different, so the quality of the film between the two is affected. It makes a difference. As a result, the contrast of the colored pattern becomes more pronounced in the subsequent coloring process.

Regarding the temperature of the electrolytic solution, the applied voltage, the time, etc., it is sufficient to energize in a conventional manner, but it is preferably carried out under the conditions of 3 to 20 V and 20 seconds to 10 minutes.

CD-2), (DI-'l) Coloring treatment step The oxide film modified in the above step is colored by the method described above. That is, alternating current electrolysis or blood flow cathodic electrolysis is performed in an electrolytic solution containing an inorganic metal salt to form a colored film.

As a result, an extremely clear Hiko colored pattern with different shading is formed on the aluminum alloy surface.

Material Although pure aluminum is excluded in the present invention, various aluminum alloys can be used. Suitable examples of aluminum alloys include alloys whose strength is increased by quenching and tempering, that is, alloys with main additives such as Mt + 5iZn + My, etc., but they are not limited to these, and additional elements, By combining work hardening, heat treatment conditions, etc., the contrast of the colored pattern and the contrast of the pattern can be completely adjusted. Further, in order to enhance the heat treatment effect and shorten the treatment time, the amount of added elements can be changed. For example, in an alloy of AL -Mf = Si or in an alloy of N, -M -Si-Pg,
Depending on the combination of addition amounts, for example, by adding excess Si, age hardening can be promoted. Therefore, for the purpose of improving color tone, pattern contrast, workability of processing steps, etc., it is possible to use an aluminum alloy with an alloy component suitable for the processing steps and conditions.

Effects of the Invention As described above, the patterning of the aluminum alloy according to the present invention can be achieved by the surface treatment methods that include forming a base pattern by mechanical operation, complete age hardening treatment, anodizing treatment by AC electrolysis, and coloring treatment. Due to the interaction of each process, a difference in coloring and lightness occurs between the lower i pattern part and the background, and the aluminum alloy surface has excellent corrosion resistance, weather resistance, abrasion resistance, etc., as well as wood grain and print. Various desired beautiful colored patterns can be created through mediation. In addition, by adding the oxide film modification step, the difference in coloring shading becomes even larger,
A colored pattern with very clear contrast and excellent colorability can be obtained.

In addition, since a complete age hardening treatment is used, it is possible to perform a series of processes to impart mechanical strength, especially hardness, to the aluminum alloy before forming the gold, anodizing, or colored film, and it can also be applied continuously to the base material immediately after extrusion. Since patterns can be formed, patterned surfaces of aluminum alloys can be treated with good workability, productivity, and energy efficiency. In addition, since the underlying pattern appears as it is as a colored contrast pattern, the racking form in the surface treatment process can be either horizontal racking or vertical racking, and there is no need to add any new technology, and currently M It has the advantage of being able to deal with even the near 5 Hayabusa.

In addition, the aluminum alloy shapes treated according to the present invention show no deterioration in performance even after being given a base pattern, no defects were observed when observing the oxide film or colored film under a microscope, and electrolytic coloring was also observed in various tests. It looks the same as the colored form, and can be used freely for the same purpose, without any restrictions on interior or exterior.

Examples Example 1 Aluminum alloy (Δ-60635) immediately after extrusion molding
A base pattern was formed by spraying 1000 Kg/cl of water onto the shape using a high-pressure spraying device, and then the aluminum alloy shape was completely age-hardened at 200° C. for 5 hours.

Thereafter, the aluminum alloy profile was degreased, etched, and smut removed, and then immersed in a 197θV% sulfuric acid aqueous solution at a current density of 24'4/(approximately 9V') and a H temperature of 21°C.
, AC electrolysis was carried out for 40 minutes using carbon as a counter electrode to form an AC film of 11 μm. After that, as a coloring process, length 2001
Using a container with a width of 150 m, a width of 150 m, and a height of 150 m + n with a carbon counter electrode placed at one end of the container as an electrolytic coloring device, the aluminum alloy shape with a length of 150 wIns, a width of 70 m, and a thickness of 1 to 3 days was used. , the distance between the poles was 1180 mm, and the initial current density was I A/dtr? , l When AC electrolysis was carried out for 5 minutes at an applied voltage of OVO, the base pattern part was colored in a dark shade compared to the background, and a beautiful decorative pattern was revealed.

Electrolyte bath composition: Sulfuric acid 402μ Sodium 3,000 ionate 1tμ Stannous sulfate 41μ Example 2 After cooling the extruded aluminum alloy (A-60635) shape to room temperature, it was heated using a high-pressure injection device.
A base pattern was formed by spraying 200 Krd water, and the aluminum alloy shape of the hind leg was heated at 210°C for 3 hours.
Complete age hardening treatment was performed under the following conditions. After that, the aluminum alloy shape is degreased, etched, and smut removed.
next! q v, y vs sulfuric acid aqueous solution, current density 2.5 A/dn? (electrical ratio ++V), liquid temperature 21℃
, AC electrolysis was carried out for 35 minutes using carbon as a counter electrode to form an AC film of 11 μm. Subsequently, as an oxide film modification treatment, a current density of 2.8 A/dn was applied to the carbon counter electrode under the same concentration and temperature conditions as the anodic oxidation treatment bath. (electronic 7,
When the AC type 1'/7 was applied for 7 minutes at 8 V) and then the coloring treatment was applied in the same manner as in Example 1, the base pattern part was colored a little darker than the background, which was similar to that in Example 1. It revealed a much more beautiful ocher decorative pattern than 1.

Example 3 The oxide film modification treatment of Example 2 was carried out at a current density of 1 A/ck
r? When the aluminum alloy profile was treated in exactly the same manner as in Example 2, except that the aluminum alloy profile was connected to the cathode and subjected to DC electrolysis for 2 minutes at (electrometric 5F),
A beautiful ocher decorative pattern with a difference in shade between the base pattern on the surface of the profile and the background was revealed.

Example 4 After cooling the extruded aluminum alloy (-60635) to room temperature, the surface of the aluminum alloy profile was irradiated with a laser beam with a frequency of 30KH2 and I6A.
A base pattern was formed by irradiation at a rate of IOTMV'Sec. Next, complete age hardening treatment was performed under 200'C x 3A conditions, and then the aluminum alloy shape was degreased, etched, and smut removed, and the shape was heated to +8W/V.
% sulfuric acid aqueous solution, current density K 2.5 A/C
Lyt? AC electrolysis was carried out for 40 minutes using carbon as a counter electrode at a liquid temperature of 20° C. to form a 9-R film with a thickness of 12 μm. Next, as a heavy coating modification treatment, Example 2
With the same equipment and temperature bath, the current density was 1.2 A/ln.
? (Electrical bJ') for 1 minute and 30 seconds, the aluminum alloy shape was connected to the cathode and DC electrolysis was performed. Next, as a coloring treatment, using the same apparatus as in Example 1, immersing it in an electrolytic solution having the following composition at a bath temperature of 20°C, and carrying out AC electrolysis at an applied voltage of 11 r for 5 minutes and 30 seconds, the base The pattern part was colored in kana δ compared to the background, resulting in a clear olive-colored decorative pattern.

Electrolyte composition: sulfuric acid 2Qtnt/l.

Nickel sulfate 302μ Stannous sulfate 5 g/l Cresol sulfonic acid IQf/Example 5 High temperature aluminum alloy (A-6o63S) immediately after extrusion
A base pattern was formed by bringing uneven carbon into contact with the surface of the aluminum alloy profile, which was once cooled to room temperature, and then completely age-hardened at 220° C. for 2 hours. After cleaning, the aluminum alloy profile is degreased, etched, and smut removed, and then lq IF/
Immersed in a sulfuric acid aqueous solution of V%, current density 1.2 A/
cLn? (Electrical 8V), liquid temperature 20°C, and 5oOy current electrolysis with carbon counter electrode to form an 11 μm AC film. Subsequently, as an oxide film modification treatment, a current density of 2.84'dn? was applied to a carbon counter electrode under the same concentration and temperature conditions as the anodic oxidation treatment bath. (electrical ratio 7.8 V) at 7
AC current S was applied for one minute, and then, as a coloring treatment, all the power equipment was used in the same manner as in Actual Example 1, and a liquid having the following composition was heated to 20
Immersed in electrolyte solution at ℃ and applied voltage of +5V for 2 minutes.
When blood flow electrolysis was carried out using the aluminum alloy profile as a cathode, the base pattern was colored slightly darker and blackish brown compared to the background, and a clear bronze decorative pattern was exposed.

Electrolyte composition: Nickel sulfate 30? /boric acid 202
μ ammonium sulfate 152 μ /) 114.5 Example 6 After cooling the aluminum alloy (A-60635) shape after extrusion to room temperature, stainless steel cut wire (particle size 100
) is injected from a φ nozzle in 6.4 at an air pressure of 2 mm to form a base pattern, and then the aluminum alloy shape is
Completely age hardened under the conditions of ℃ x 7 mm, and then
After degreasing, etching, and removing smut in the same manner as in Example I, the profile was immersed in a 17 riv sulfuric acid water bath at a current density of 2.8 A/1 Lrr? (Voltage approx. 1λ5V)
AC electrolysis was carried out for 35 minutes at a liquid temperature of 20°C using carbon as a counter electrode.
After fully forming the AC film, next, as an oxide film modification treatment,
Current density 1.2 A/cLtr? DC electrolysis was carried out by connecting the aluminum alloy shape to the full cathode for 1 minute and 30 seconds at a voltage of approximately 6 F.Then, as a coloring treatment, a bath having the following composition at 28 °C was applied in the same container as in Example 1. When immersed in an electrolytic solution and subjected to alternating current electrolysis for 3 minutes at an applied voltage of 1 jV, only the side to which sandblasting was applied became blackish brown. The result is a beautiful shape with different coloring.

Electrolyte composition: nickel sulfate 25 f/l magnesium sulfate 5 f/ ammonium sulfate 30 f/l boric acid 20 t/l ammonium thiosulfate l f/l PH5.5 Example 7 A stainless steel plate with a thickness of approximately 0.6 mm was etched. , a patterned embossed plate with irregularities of about 30 μm is made.

Next, the extruded aluminum alloy (A-60635) shape is once heated to room temperature vcw.Then, the above-mentioned embossing plate device is placed on top of the aluminum alloy shape, and furthermore, the aluminum A base pattern was completely formed on the alloy surface, and then complete age hardening treatment was performed at 220°C for 2 hours.Next, the aluminum alloy profile was degreased, etched, and smut removed, and the profile t+9i
Immersed in p7g sulfuric acid aqueous solution, current density +, q 1
y=(voltage of approximately 12 V), liquid temperature of 20° C., and conductive flow electrolysis using counter electrode carbon for 35 minutes to completely form an AC film of 10 μm.

Next, as an oxide film modification treatment, the aluminum alloy shape was heated for 1 minute and 30 seconds using the same equipment and the same concentration bath as in Example 2 at 1 to 2 A/dd (voltage approximately 1') of frost and fluid dust. Connected to the cathode for direct current electrolysis.

Next, as a coloring process, the same equipment as in Example 1 was used.
When immersed in an electrolytic solution having the following composition at a bath temperature of 20°C and electrolyzed for 5 minutes and 30 seconds at an applied voltage of IIVO,
The base pattern was colored much darker than the background, resulting in a vivid olive-colored decorative pattern.

Electrolyte composition: sulfuric acid 2Qmt/nickel sulfate 30f//stannic sulfate 5? /l Cresol Nurphon ff IOfμ Comparative Example 1 In Example 1, the anodizing treatment was performed in the following manner: 1. l /l/
lj! y, +2 (approximately 12 V), liquid temperature 21°C, and anodizing with blood flow using the aluminum alloy as an anode for 35 minutes.
When the tube was treated in the same manner as in Example 1 except that a blood flow film of 1 μm was formed, the spine part was pale yellow and the base pattern part was colored slightly darker than the background, but Example 1 It was unclear and rare compared to .

[Brief explanation of the drawing]

Figure 1 is a graph showing the influence of age hardening temperature and treatment time on the hardness of aluminum alloy (A-6O63S), and Figure 2 is a graph showing the appropriate range of time and temperature for complete age hardening treatment. be.

Claims (1)

[Claims] 1 (Waku) A base pattern is applied to the surface of the aluminum alloy after extrusion molding by mechanical operation, (Then, the aluminum alloy is subjected to a complete age hardening treatment, After fully forming an anodic oxide film on the alloy by alternating current electrolysis, (ρ
Machine attachment is a surface treatment method. 2. After extrusion, the surface of the aluminum alloy is given a base pattern by mechanical manipulation. (c) The aluminum alloy is then subjected to a complete age hardening treatment. After forming an anodic oxide film by electrolysis and modifying the anodic oxide film by alternating current electrolysis in an inorganic acid and/or organic acid bath using (DI) Ht, CD-2) Coloring the film 1! !!The patterning of aluminum alloy is a surface treatment method that is characterized by making the base pattern clearly appear on the aluminum alloy surface by applying a tray. 3 (a) Mechanical manipulation on the aluminum alloy surface after extrusion molding. Then, the aluminum alloy is subjected to complete age hardening treatment, (0) After that, an anodic oxide film is formed on the aluminum alloy by AC electrolysis, and then (lj-+) is applied. After the aluminum alloy is connected to a cathode in an inorganic acid and/or organic acid bath and blood flow electrolysis is performed to completely modify the oxide film, (
D-2) A surface treatment method for patterning a special aluminum alloy, characterized in that the base pattern p1 can be clearly expressed on the surface of the all-aluminum alloy by applying a coloring treatment.