Production process of wood grain aluminum alloy and wood grain aluminum alloy

Abstract

This invention relates to a production process for wood grain-look aluminum alloys, including the steps of degreasing, alkaline etching, neutralization, chemical polishing, wood grain texture removal, and anodizing. The wood grain texture removal process involves placing the chemically polished aluminum alloy substrate in a wood grain texture treatment agent and reacting it for 800-1000 seconds at room temperature, pH 7.5-8.5, and voltage 20-30V. The wood grain texture treatment agent includes sodium hydroxide, boric acid, and additives. The invention also relates to wood grain-look aluminum alloys obtained through the aforementioned production process. This invention incorporates a wood grain texture removal step and a film removal step in the anodizing process to obtain an aluminum alloy with a wood grain appearance. The wood grain-look aluminum alloy obtained using this invention has clear surface textures, a significant difference in gloss between the wood grain texture area and the non-texture area, and the edge areas of the obtained wood grain-look aluminum alloy exhibit corrosion pitting.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy manufacturing and processing technology, and in particular to a production process for wood grain aluminum alloy and the wood grain aluminum alloy itself. Background Technology

[0002] With the increasing demand for diverse product appearances, wood-grain aluminum alloys have gained popularity due to their combination of metallic properties and a wood-like appearance. Methods for creating wood-grain finishes on aluminum alloy surfaces include mechanical methods, printing methods, lamination methods, and electrolytic methods. Among these, mechanical, printing, and lamination methods are collectively referred to as physical methods, while electrolysis is an electrochemical method. Existing electrochemical processes for manufacturing wood-grain aluminum alloys often employ acidic electrolytic systems containing boric acid and citric acid. Aluminum alloys manufactured using this system exhibit fine wood-grain textures, are prone to corrosion at the edges, and are difficult to control during operation. Summary of the Invention

[0003] The purpose of this invention is to solve the above-mentioned problems and provide a production process for wood grain aluminum alloy.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] A manufacturing process for wood grain-look aluminum alloy includes the following steps:

[0006] Degreasing: The aluminum alloy substrate is immersed in a degreasing agent for degreasing.

[0007] Alkali etching: The degreased aluminum alloy substrate is placed in an alkaline solution for alkaline etching;

[0008] Neutralization: The alkaline-etched aluminum alloy substrate is immersed in a descaling agent for neutralization;

[0009] Chemical polishing: The neutralized aluminum alloy substrate is placed in a chemical polishing agent for chemical polishing; the chemical polishing agent includes one or a mixture of two of phosphoric acid or sulfuric acid;

[0010] Wood grain finish: The chemically polished aluminum alloy substrate is placed in a wood grain finish agent and reacted for 800-1000 seconds at room temperature, pH 7.5-8.5 and voltage 20-30V; the wood grain finish agent includes sodium hydroxide, boric acid and additives.

[0011] Removal of film: The aluminum alloy substrate after wood grain imitation treatment is removed by using an etchant to form a wood grain texture on the surface of the aluminum alloy substrate; the etchant is a mixture of sulfuric acid and phosphoric acid, wherein the mass ratio of sulfuric acid to phosphoric acid is 5-6:1;

[0012] Anodizing: The aluminum alloy substrate after the film has been removed is placed in an electrolyte solution for anodizing; wood grain aluminum alloy is obtained.

[0013] Preferably, the degreasing is carried out at a temperature of 50-60℃ for a reaction time of 3-5 minutes; the degreasing agent is Okuno 161 degreasing powder with a mass concentration of 50-70 g / L.

[0014] Preferably, the wood grain treatment agent comprises sodium hydroxide with a mass concentration of 1-10 g / L, boric acid with a mass concentration of 20-50 g / L, and an additive with a mass concentration of 5-25 g / L; the additive is obtained by mixing sodium nitrate with a mass concentration of 30 g / L and sodium phosphate with a mass concentration of 30 g / L.

[0015] Preferably, the membrane removal is carried out at a temperature of 75-78°C for 30-60 seconds.

[0016] Preferably, in the alkaline etching step, the aluminum alloy substrate is immersed in an alkaline solution with a mass concentration of 50-70 g / L and reacted at a temperature of 50-60°C for 30-50 seconds.

[0017] Preferably, in the neutralization step, the alkaline-etched aluminum alloy substrate is treated with a desiccant with a mass concentration of 90-150 g / L for 10-30 seconds; the desiccant includes a nitrogen-free desiccant.

[0018] Preferably, in the chemical polishing step, the neutralized aluminum alloy substrate is immersed in a chemical polishing agent and reacted at a temperature of 75-78°C for 120-200 seconds; the chemical polishing agent is a mixture of sulfuric acid and phosphoric acid, wherein the mass concentration of phosphoric acid is 1000-1200 g / L and the mass concentration of sulfuric acid is 150-250 g / L.

[0019] Preferably, in the anodizing step, the electrolyte solution includes aluminum ions and sulfuric acid, wherein the mass concentration of sulfuric acid is 180-220 g / L; and the anodizing voltage is 12-15 V.

[0020] Preferably, the anodizing step is followed by coloring and sealing; the coloring step includes: coloring the anodized aluminum alloy substrate with a coloring agent; the sealing step includes: placing the colored aluminum alloy substrate in a sealing agent with a mass concentration of 12-15 g / L and reacting it for 50-55 min at a pH of 5.5-5.8.

[0021] Another object of the present invention is to disclose a wood grain aluminum alloy, which is obtained by the above-mentioned wood grain aluminum alloy production process.

[0022] The beneficial effects of this invention include at least the following:

[0023] This invention incorporates a wood grain imitation treatment step and a film removal step in the anodizing process to obtain an aluminum alloy with a wood grain imitation appearance. The wood grain imitation aluminum alloy obtained using the technical solution of this invention has clear surface texture, a significant difference in gloss between the wood grain texture area and the non-texture area, and the edge area of ​​the obtained wood grain imitation aluminum alloy has corrosion pits. Attached Figure Description

[0024] Figure 1 This is a flowchart illustrating the manufacturing process of the wood grain aluminum alloy of the present invention.

[0025] Figure 2 This is a schematic diagram of the surface structure of the wood grain aluminum alloy prepared in Example 1.

[0026] Figure 3 This is a schematic diagram of the surface structure of the wood grain aluminum alloy prepared in Comparative Example 1. Detailed Implementation

[0027] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0029] This invention can be applied to the manufacture of wood-grain aluminum alloys in fields such as aluminum alloy building materials or aluminum alloy casings for electronic products, for example... Figure 1 As shown, the present invention provides a manufacturing process for a wood grain-look aluminum alloy, comprising the following steps:

[0030] Degreasing: The aluminum alloy substrate is immersed in a degreasing agent for degreasing; the degreasing is carried out at a temperature of 50-60℃ for a reaction time of 3-5 minutes; the degreasing agent is Okuno 161 degreasing powder with a mass concentration of 50-70 g / L. During the rolling, extrusion, or milling process, aluminum alloy substrates inevitably accumulate oily substances or residual fine powder on their surface, and a natural oxide film also forms during storage in the air. Therefore, to ensure the smooth progress of subsequent processes, a degreasing agent is used to degrease the aluminum alloy substrate. Okuno 161 degreasing powder is a weakly alkaline, low-corrosive degreasing agent. During use, due to its low corrosiveness, it will not damage the gloss of the aluminum alloy substrate. Furthermore, due to its low foaming properties, it can be operated using air agitation or spraying procedures, thus requiring less stringent environmental conditions for degreasing treatment.

[0031] Alkali etching: The degreased aluminum alloy substrate is placed in an alkaline solution for alkaline etching; in the alkaline etching step, the aluminum alloy substrate is immersed in an alkaline solution with a mass concentration of 50-70 g / L and reacted at a temperature of 50-60℃ for 30-50 seconds; the alkaline solution is preferably a sodium hydroxide solution.

[0032] Neutralization: The alkaline-etched aluminum alloy substrate is immersed in a desiccant for neutralization; in the neutralization step, the alkaline-etched aluminum alloy substrate is treated with a desiccant with a mass concentration of 90-150 g / L for 10-30 seconds; the desiccant includes a nitrogen-free desiccant.

[0033] Chemical polishing: The neutralized aluminum alloy substrate is placed in a chemical polishing agent for chemical polishing; the chemical polishing agent includes one or a mixture of two of phosphoric acid or sulfuric acid. In this chemical polishing step, the neutralized aluminum alloy substrate is immersed in the chemical polishing agent and reacted at a temperature of 75-78℃ for 120-200 seconds; the chemical polishing agent is a mixture of sulfuric acid and phosphoric acid, wherein the mass concentration of phosphoric acid is 1000-1200 g / L and the mass concentration of sulfuric acid is 150-250 g / L. Too short a chemical polishing time will not achieve the desired polishing effect, while too long a time will affect the important dimensions of the aluminum alloy; higher sulfuric acid concentration and higher temperature result in a faster polishing speed, but excessively high sulfuric acid concentration will cause uneven gloss in the product due to excessively fast polishing speed. To increase the aluminum ion content during chemical polishing, an aluminum plate can be added to provide an appropriate aluminum ion content, depending on the actual operation.

[0034] Wood grain imitation treatment: The chemically polished aluminum alloy substrate is placed in a wood grain imitation treatment agent with a mass concentration of 60-70 g / L and reacted for 800-1000 s at room temperature, pH 7.5-8.5, and voltage 20-30 V; the wood grain imitation treatment agent includes sodium hydroxide, boric acid, and additives; the electrode is preferably stainless steel; in this invention, considering both the wood grain formation effect and energy saving factors, the reaction temperature of the wood grain imitation treatment is set to room temperature.

[0035] The wood grain finish agent comprises sodium hydroxide at a mass concentration of 1-10 g / L, boric acid at a mass concentration of 20-50 g / L, and an additive at a mass concentration of 5-25 g / L; the additive is obtained by mixing sodium nitrate at a mass concentration of 30 g / L and sodium phosphate at a mass concentration of 30 g / L.

[0036] The chemical and electrode reactions involved in the wood grain finish include:

[0037] 2Al+2NaOH+2H2O→2NaAlO2+3H2↑;

[0038] NaOH + H3BO3 → NaBO2 + 2H2O;

[0039] 8Al+8NaOH+3NaNO3→8NaAlO2+3NH3+4H2O;

[0040] 4Zn+7NaOH+NaNO3→NaZnO2+NH3+2H2O;

[0041] 2H₂O + 2e⁻ → H₂↑ + 2OH⁻;

[0042] Al-3e→Al3+;

[0043] 4OH—4e→H2O+2[O];

[0044] 2Al³⁺ + 3[O] → Al₂O₃;

[0045] Al₂O₃ + 2NaOH → 2NaAlO₂ + H₂O.

[0046] As shown above, in the wood grain finish agent, the addition of sodium hydroxide, boric acid, and additives works synergistically to achieve a dynamic equilibrium between the formation and dissolution of the film layer on the aluminum alloy surface, ensuring the regularity of the wood grain pattern. During the wood grain finish process, sodium nitrate promotes the reaction, while sodium phosphate adjusts the smoothness of the wood grain pattern structure. Boric acid is a weak acid and undergoes hydrolysis in aqueous solution; therefore, it acts as a buffer during the reaction, keeping the pH of the solution stable.

[0047] Removal of the coating: An etchant is used to remove the coating from the aluminum alloy substrate after the wood grain imitation treatment to form a wood grain pattern on the surface of the aluminum alloy substrate. The etchant includes a mixture of sulfuric acid and phosphoric acid, wherein the mass ratio of sulfuric acid to phosphoric acid is 5-6:1. The removal process is carried out at a temperature of 75-78℃ for 30-60 seconds. The removal temperature is an important factor affecting the removal speed. When the removal temperature is below 75℃, the removal speed is too slow, resulting in low production efficiency; when the temperature is above 78℃, the removal speed is too fast and difficult to control. To obtain a good removal effect, the removal temperature is set at 75-78℃ in this invention. Insufficient removal time results in incomplete wood grain formation; excessive removal time can easily cause over-corrosion of the aluminum alloy substrate. Optionally, the mass concentration of sulfuric acid and phosphoric acid used in the removal step can be the same as that used in the chemical polishing step.

[0048] Because the film layer formed on the aluminum alloy surface during the wood grain imitation process is extremely thin, an acidic etchant is used in this invention to avoid damaging the aluminum alloy substrate and thus the wood grain pattern during the film removal process. Furthermore, the self-removing process also provides a secondary chemical polishing effect, enhancing the gloss of the wood grain pattern. In addition, the etchant includes phosphoric acid and sulfuric acid, avoiding the pollution and impact on the environment and operators caused by nitrogen oxides generated from nitric acid. In this invention, through the combined action of wood grain imitation treatment and film removal, during electrolysis, the wood grain imitation treatment agent first forms a film layer on the aluminum alloy surface. Then, under the action of the etchant, the thinner areas of the film layer are preferentially dissolved, exposing local aluminum alloy substrates. The current density in these exposed areas increases, generating a large amount of gas. Under the combined action of the gas and the etchant, the film layer is dissolved along the rising gas path, gradually forming stripes.

[0049] This invention adds a wood grain treatment step to the existing anodizing process, using an alkaline wood grain treatment agent to treat the aluminum alloy substrate with a wood grain texture. The operation method is simple, the alkaline environment avoids excessive corrosion of the aluminum alloy substrate, improves the performance of the wood grain aluminum alloy, and enhances the appearance of the wood grain aluminum alloy to be closer to the natural wood texture.

[0050] Anodizing: The aluminum alloy substrate after film removal is placed in an electrolyte solution for anodizing; a wood grain aluminum alloy is obtained. In the anodizing step, the electrolyte solution includes aluminum ions and sulfuric acid, wherein the mass concentration of sulfuric acid is 180-220 g / L; the anodizing voltage is 12-15 V, and the anodizing time is 20-60 min.

[0051] Coloring: The anodized aluminum alloy substrate is colored with a coloring agent. After wood grain treatment, film removal, and anodizing, the surface of the aluminum alloy substrate forms a ribbed structure similar to wood grain. To make the resulting aluminum alloy have a more wood-like appearance, coloring is performed to obtain various wood colors. Alternatively, when a chestnut wood color is desired, an electrolytic coloring method can be used, using nickel sulfate, copper sulfate, and boric acid as coloring agents, and stainless steel as the electrode plate to color the aluminum alloy. By changing the composition of the coloring agent, other wood colors such as imitation linden or imitation bronze can also be achieved.

[0052] Sealing involves placing the colored aluminum alloy substrate in a sealing agent with a mass concentration of 12-15 g / L and reacting it for 50-55 minutes at a pH of 5.5-5.8. The sealing agent is preferably DX-500. Sealing is performed to improve the corrosion resistance, stain resistance, stability, light resistance, and weather resistance of the wood grain aluminum alloy.

[0053] The sealing process includes a drying or baking step, which dries the aluminum alloy.

[0054] Example 1

[0055] Degreasing: The aluminum alloy substrate is immersed in Okuno 161 degreasing agent with a mass concentration of 55 g / L for degreasing. The aluminum alloy substrate is preferably 6063 aluminum alloy. The process is carried out at a temperature of 53°C for 3 minutes.

[0056] Alkaline etching: The degreased aluminum alloy substrate is placed in a sodium hydroxide solution with a mass concentration of 50 g / L and reacted at a temperature of 55℃ for 35 seconds.

[0057] Neutralization: Immerse the alkaline-etched aluminum alloy substrate in a nitrogen-free desiccant with a mass concentration of 98 g / L and allow it to neutralize for 15 seconds.

[0058] Chemical polishing: The neutralized aluminum alloy substrate is placed in a mixture of phosphoric acid and sulfuric acid and reacted at 75-78℃ for 120s; the mass concentration of phosphoric acid is 100g / L and the mass concentration of sulfuric acid is 160g / L.

[0059] Wood grain finish: The chemically polished aluminum alloy substrate is placed in a wood grain finish agent and reacted for 800 seconds at room temperature (30°C), pH (8.5), and voltage (30V). The wood grain finish agent comprises sodium hydroxide (4 g / L), boric acid (20 g / L), and an additive (25 g / L). The additive is obtained by mixing sodium nitrate (30 g / L) and sodium phosphate (30 g / L).

[0060] Removal of film: The aluminum alloy substrate after wood grain imitation treatment is removed using an etchant to form a wood grain texture on the surface of the aluminum alloy substrate; the etchant is a mixture of sulfuric acid and phosphoric acid, and the reaction is carried out at a temperature of 75°C for 30 seconds; wherein the mass ratio of sulfuric acid to phosphoric acid in the etchant is 5:1;

[0061] Anodizing: The aluminum alloy substrate after film removal is placed in an electrolyte solution for anodizing; wood grain aluminum alloy is obtained; the electrolyte solution is sulfuric acid with a mass concentration of 180g / L and the voltage is 12V;

[0062] Coloring: Electrolytic coloring can be used, with nickel sulfate, copper sulfate and boric acid as coloring agents and stainless steel as electrode plates for coloring treatment;

[0063] Sealing: Place the colored aluminum alloy substrate in DX-500 sealing agent with a mass concentration of 12-15 g / L and react for 50 min at a pH of 5.5-5.8.

[0064] Example 2

[0065] Degreasing: The aluminum alloy substrate is immersed in Okuno 161 degreasing agent with a mass concentration of 50 g / L for degreasing. The aluminum alloy substrate is preferably 6063 aluminum alloy. The process is carried out at a temperature of 50°C for 4 min.

[0066] Alkaline etching: The degreased aluminum alloy substrate is placed in a sodium hydroxide solution with a mass concentration of 65 g / L and reacted at a temperature of 58℃ for 30 seconds;

[0067] Neutralization: Immerse the alkaline-etched aluminum alloy substrate in a nitrogen-free desiccant with a mass concentration of 90 g / L and allow it to neutralize for 10 seconds.

[0068] Chemical polishing: The neutralized aluminum alloy substrate is placed in a mixture of phosphoric acid and sulfuric acid and reacted at 75°C for 200 seconds; the mass concentration of phosphoric acid is 1200 g / L and the mass concentration of sulfuric acid is 150 g / L.

[0069] Wood grain finish: The chemically polished aluminum alloy substrate is placed in a wood grain finish agent and reacted for 900 seconds at room temperature (20°C), pH (7.5), and voltage (25V). The wood grain finish agent comprises sodium hydroxide (1 g / L), boric acid (50 g / L), and an additive (20 g / L). The additive is obtained by mixing sodium nitrate (30 g / L) and sodium phosphate (30 g / L).

[0070] Removal of film: The aluminum alloy substrate after wood grain imitation treatment is removed using an etchant to form a wood grain texture on the surface of the aluminum alloy substrate; the etchant is a mixture of sulfuric acid and phosphoric acid, and the reaction is carried out at a temperature of 78°C for 60 seconds; wherein the mass ratio of sulfuric acid to phosphoric acid in the etchant is 6:1.

[0071] Anodizing: The aluminum alloy substrate after film removal is placed in an electrolyte solution for anodizing; wood grain aluminum alloy is obtained; the electrolyte solution is sulfuric acid with a mass concentration of 220g / L and the voltage is 15V;

[0072] Coloring: Electrolytic coloring can be used, with nickel sulfate, copper sulfate and boric acid as coloring agents and stainless steel as electrode plates for coloring treatment;

[0073] Sealing: Place the colored aluminum alloy substrate in DX-500 sealing agent with a mass concentration of 12-15 g / L and react for 55 min at a pH of 5.5-5.8.

[0074] Example 3

[0075] Degreasing: The aluminum alloy substrate is immersed in Okuno 161 degreasing agent with a mass concentration of 60g / L for degreasing. The aluminum alloy substrate is preferably 6063 aluminum alloy. The process is carried out at a temperature of 55℃ for 5 minutes.

[0076] Alkaline etching: The degreased aluminum alloy substrate is placed in a sodium hydroxide solution with a mass concentration of 55 g / L and reacted at a temperature of 60℃ for 50 seconds.

[0077] Neutralization: The alkaline-etched aluminum alloy substrate was immersed in a nitrogen-free desiccant with a mass concentration of 150 g / L and the neutralization reaction lasted for 27 seconds.

[0078] Chemical polishing: The neutralized aluminum alloy substrate is placed in a mixture of phosphoric acid and sulfuric acid and reacted at 78°C for 160 seconds; the mass concentration of phosphoric acid is 1000 g / L and the mass concentration of sulfuric acid is 200 g / L.

[0079] Wood grain finish: The chemically polished aluminum alloy substrate is placed in a wood grain finish agent and reacted for 1000 seconds at room temperature (25°C), pH (8), and voltage (27V). The wood grain finish agent comprises sodium hydroxide (10 g / L), boric acid (35 g / L), and an additive (5 g / L). The additive is obtained by mixing sodium nitrate (30 g / L) and sodium phosphate (30 g / L).

[0080] Removal of film: The aluminum alloy substrate after wood grain imitation treatment is removed using an etchant to form a wood grain texture on the surface of the aluminum alloy substrate; the etchant is a mixture of sulfuric acid and phosphoric acid, and the reaction is carried out at a temperature of 75°C for 35 seconds; wherein the mass ratio of sulfuric acid to phosphoric acid in the etchant is 5:1;

[0081] Anodizing: The aluminum alloy substrate after film removal is placed in an electrolyte solution for anodizing; wood grain aluminum alloy is obtained; the electrolyte solution is sulfuric acid with a mass concentration of 200g / L and the voltage is 12V;

[0082] Coloring: Electrolytic coloring can be used, with nickel sulfate, copper sulfate and boric acid as coloring agents and stainless steel as electrode plates for coloring treatment;

[0083] Sealing: Place the colored aluminum alloy substrate in DX-500 sealing agent with a mass concentration of 12-15 g / L and react for 55 min at a pH of 5.5-5.8.

[0084] Example 4

[0085] Degreasing: The aluminum alloy substrate is immersed in Okuno 161 degreasing agent with a mass concentration of 70 g / L for degreasing. The aluminum alloy substrate is preferably 6063 aluminum alloy. The process is carried out at a temperature of 60°C for 3 min.

[0086] Alkaline etching: The degreased aluminum alloy substrate is placed in a sodium hydroxide solution with a mass concentration of 70 g / L and reacted at a temperature of 50℃ for 40 s;

[0087] Neutralization: Immerse the alkaline-etched aluminum alloy substrate in a nitrogen-free desiccant with a mass concentration of 120 g / L and allow it to neutralize for 30 seconds.

[0088] Chemical polishing: The neutralized aluminum alloy substrate is placed in a mixture of phosphoric acid and sulfuric acid and reacted at 77°C for 200 seconds; the mass concentration of phosphoric acid is 1200 g / L and the mass concentration of sulfuric acid is 250 g / L.

[0089] Wood grain finish: The chemically polished aluminum alloy substrate is placed in a wood grain finish agent and reacted for 800 seconds at room temperature (25°C), pH (7.5), and voltage (30V). The wood grain finish agent comprises sodium hydroxide (7 g / L), boric acid (40 g / L), and an additive (16 g / L). The additive is obtained by mixing sodium nitrate (30 g / L) and sodium phosphate (30 g / L).

[0090] Removal of film: The aluminum alloy substrate after wood grain imitation treatment is removed using an etchant to form a wood grain texture on the surface of the aluminum alloy substrate; the etchant is a mixture of sulfuric acid and phosphoric acid, and the reaction is carried out at a temperature of 75°C for 45 seconds; wherein the mass ratio of sulfuric acid to phosphoric acid in the etchant is 6:1;

[0091] Anodizing: The aluminum alloy substrate after film removal is placed in an electrolyte solution for anodizing; wood grain aluminum alloy is obtained; the electrolyte solution is sulfuric acid with a mass concentration of 190g / L and the voltage is 15V;

[0092] Coloring: Electrolytic coloring can be used, with nickel sulfate, copper sulfate and boric acid as coloring agents and stainless steel as electrode plates for coloring treatment;

[0093] Sealing: Place the colored aluminum alloy substrate in DX-500 sealing agent with a mass concentration of 12-15 g / L and react for 50 min at a pH of 5.5-5.8.

[0094] Comparative Example 1

[0095] The difference between Comparative Example 1 and Example 1 is that the wood grain processing steps are different in Comparative Example 1.

[0096] The wood grain imitation treatment in Comparative Example 1 includes the following steps: placing the chemically polished aluminum alloy substrate in a wood grain imitation treatment agent containing citric acid with a mass concentration of 20-40 g / L, boric acid with a mass concentration of 15-35 g / L, and sodium dihydrogen phosphate with a mass concentration of 50 g / L, and reacting for 800 s under the conditions of pH value of 2.5-3.5, temperature of 30℃, and voltage of 30V, with the electrode plate being stainless steel.

[0097] Depend on Figure 2 and Figure 3 As shown, a sensory comparison of the appearance of the wood grain aluminum alloys obtained in Example 1 and Example 1 reveals that, compared to the existing methods for preparing wood grain aluminum alloys using citric acid and boric acid systems, the wood grain aluminum alloys obtained using the technical solution of this invention have clearer surface textures, a significant difference in gloss between the wood grain texture area and the non-texture area, and the edge areas of the obtained wood grain aluminum alloys have corrosion pits. The surface sensory appearance of the wood grain aluminum alloys obtained using the technical solution of this invention is closer to that of natural wood grain.

[0098] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0099] The above embodiments merely illustrate preferred implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention should be determined by the appended claims.

Claims

1. A manufacturing process for wood grain-look aluminum alloy, characterized in that, Including the following steps: Degreasing: The aluminum alloy substrate is immersed in a degreasing agent for degreasing. Alkaline etching: The degreased aluminum alloy substrate is placed in an alkaline solution for alkaline etching; Neutralization: The alkaline-etched aluminum alloy substrate is immersed in a descaling agent for neutralization; Chemical polishing: The neutralized aluminum alloy substrate is placed in a chemical polishing agent for chemical polishing; the chemical polishing agent includes one or a mixture of two of phosphoric acid or sulfuric acid; Wood grain finish: The chemically polished aluminum alloy substrate is placed in a wood grain finish agent and reacted for 800-1000 seconds at room temperature, pH 7.5-8.5 and voltage 20-30V; the wood grain finish agent includes sodium hydroxide, boric acid and additives. Removal of film: The aluminum alloy substrate after wood grain imitation treatment is removed by using an etchant to form a wood grain texture on the surface of the aluminum alloy substrate; the etchant includes a mixture of sulfuric acid and phosphoric acid, wherein the mass ratio of sulfuric acid to phosphoric acid is 5-6:1; Anodizing: The aluminum alloy substrate after film removal is placed in an electrolyte solution for anodizing; a wood grain aluminum alloy is obtained, wherein the electrolyte solution includes aluminum ions and sulfuric acid.

2. The manufacturing process of the wood grain aluminum alloy according to claim 1, characterized in that: The degreasing is carried out at a temperature of 50-60℃ for a reaction time of 3-5 minutes; the degreasing agent is Okuno 161 degreasing powder with a mass concentration of 50-70 g / L.

3. The manufacturing process of the wood grain aluminum alloy according to claim 1, characterized in that: The wood grain finish agent comprises sodium hydroxide at a mass concentration of 1-10 g / L, boric acid at a mass concentration of 20-50 g / L, and an additive at a mass concentration of 5-25 g / L; the additive is obtained by mixing sodium nitrate at a mass concentration of 30 g / L and sodium phosphate at a mass concentration of 30 g / L.

4. The manufacturing process of the wood grain aluminum alloy according to claim 1, characterized in that: The membrane removal process is carried out at a temperature of 75-78℃ for 30-60 seconds.

5. The manufacturing process of the wood grain aluminum alloy according to claim 1, characterized in that: In the alkaline etching step, the aluminum alloy substrate is immersed in an alkaline solution with a mass concentration of 50-70 g / L and reacted at a temperature of 50-60°C for 30-50 seconds.

6. The manufacturing process of the wood grain aluminum alloy according to claim 1, characterized in that: In the neutralization step, the alkaline-etched aluminum alloy substrate is treated with a desiccant with a mass concentration of 90-150 g / L for 10-30 seconds; the desiccant includes a nitrogen-free desiccant.

7. The manufacturing process of the wood grain aluminum alloy according to claim 1, characterized in that: In the chemical polishing step, the neutralized aluminum alloy substrate is immersed in a chemical polishing agent and reacted at a temperature of 75-78℃ for 120-200s; the chemical polishing agent is a mixture of sulfuric acid and phosphoric acid, wherein the mass concentration of phosphoric acid is 1000-1200g / L and the mass concentration of sulfuric acid is 150-250g / L.

8. The manufacturing process of the wood grain aluminum alloy according to claim 1, characterized in that: In the anodizing step, the mass concentration of sulfuric acid is 180-220 g / L; the voltage for anodizing is 12-15 V.

9. The manufacturing process of the wood grain aluminum alloy according to claim 1, characterized in that: The anodizing step is followed by coloring and sealing; the coloring step includes coloring the anodized aluminum alloy substrate with a coloring agent; the sealing step includes placing the colored aluminum alloy substrate in a sealing agent with a mass concentration of 12-15 g / L and reacting it for 50-55 min at a pH of 5.5-5.

8.

10. A wood-grain-like aluminum alloy, characterized in that: The wood grain aluminum alloy is produced by the wood grain aluminum alloy production process described in any one of claims 1-9.

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