Red anodizing process for aviation aluminum alloy product

Abstract

The invention relates to the field of surface treatment of aviation products, in particular to a red anodizing process for aviation aluminum alloy products, which comprises the following specific steps: A, pretreatment; b, anodic oxidation; c, coloring; d, sealing; the bright red 302 is adopted for coloring the aluminum-coated part, the sealing agent is used for sealing and color fixing, tedious varnish spraying which has influences on body health can be avoided, harmless operation treatment is achieved, the color is bright, the corrosion resistance is excellent, the field production efficiency can be improved, the product processing period is shortened, and the bright red aluminum-coated part has great significance in production optimization.

Description

Technical Field

[0001] The invention relates to the field of surface treatment of aviation products, in particular to a red anodizing process for aviation aluminum alloy products. Background Art

[0002] The anodized film of aluminum alloy has comprehensive advantages such as good bonding and strong corrosion resistance, and has been widely used in the aviation field. The oxide film of aluminum and aluminum alloy has a single color. The traditional electrolytic coloring of aluminum alloy has the characteristics of high raw material cost and energy consumption and complex process control. In contrast, organic dyeing technology has the advantages of fast coloring, high efficiency, simple operation and good durability, and is particularly suitable for aluminum and aluminum alloy products with strong decorative properties.

[0003] Traditional organic dye Alizarin Red S is used to dye the product after sulfuric acid anodization. After coloring, in order to improve the color fastness of the film layer, it is necessary to spray varnish to fix the color. The coloring effect of Alizarin Red S on aluminum-clad parts is poor, and the process is easy to pollute the environment and the work efficiency is low. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a red anodizing process for aviation aluminum alloy products.

[0005] A red anodizing process for aviation aluminum alloy products, the specific steps are as follows:

[0006] A. Pretreatment:

[0007] A1: Organic solvent cleaning, put the parts into organic solvent for cleaning for more than 5 minutes;

[0008] A2: Chemical degreasing, put the parts into a chemical solution for degreasing, where the total alkalinity of the solution is equivalent to NaOH of 20-35g / L;

[0009] Temperature: 60℃;

[0010] Time: 10 minutes;

[0011] A3: Wash with running hot water. Put the parts in running hot water for more than 3 times.

[0012] Temperature: 50℃;

[0013] Time: 2 minutes;

[0014] A4: Wash with running cold water. Immerse the parts washed with running hot water in running cold water for cleaning.

[0015] Wherein temperature: room temperature;

[0016] Time: 2 minutes;

[0017] A5: Polishing: To effectively remove the residue after chemical degreasing, put the parts into the following solution for polishing;

[0018] Wherein temperature: room temperature;

[0019] Time: until all the money is sold out;

[0020] A6: Wash with running cold water. Immerse the parts washed with running hot water in running cold water for cleaning.

[0021] Temperature: room temperature;

[0022] Time: 2 minutes;

[0023] A7: Alkali corrosion: put the parts after the cold water washing into the alkaline corrosion tank to remove the oxide scale or surface defects on the surface of the parts;

[0024] Wherein, temperature: 50~60℃;

[0025] Time: less than or equal to 2 minutes, and for precision parts, it should be reduced to no more than 30 seconds;

[0026] A8: Wash with running hot water. Put the parts in running hot water for at least 3 times.

[0027] Temperature: 50℃;

[0028] Time: 2 minutes;

[0029] A9: Wash with running cold water. Immerse the parts washed with running hot water in running cold water for cleaning.

[0030] Temperature: room temperature;

[0031] Time: 2 minutes;

[0032] A10: Polishing: In order to effectively remove the residues after alkali corrosion, put the parts into the following solution for polishing;

[0033] The formula of the light-emitting solution is: 300-500 g / L nitric acid;

[0034] Temperature: room temperature;

[0035] Time: until all the money is sold out;

[0036] A11: Wash with running cold water. Immerse the parts washed with running hot water in running cold water for cleaning.

[0037] Temperature: room temperature;

[0038] Time: 2 minutes;

[0039] B. Anodizing: put the parts washed with running cold water into the solution for anodizing;

[0040] Among them, anode current density: 0.5~2.0A / dm 2 ;

[0041] Temperature: 13-26℃;

[0042] C. Coloring:

[0043] C1: Wash with running cold water, immerse the anodized parts in running cold water for cleaning;

[0044] Temperature: room temperature;

[0045] Time: 2 minutes;

[0046] C2: Coloring red, the colored parts are anodized and washed with running cold water, and then colored with bright red 302 organic dye;

[0047] Concentration: 3-10 g / L;

[0048] pH: 5.4-7.4;

[0049] Temperature: 35~55℃;

[0050] Time: 3-5 minutes;

[0051] C3: Wash with running cold water, immerse the colored parts in running cold water for cleaning;

[0052] Temperature: room temperature;

[0053] Time: 2 minutes;

[0054] D. Closed:

[0055] D1: Use sealant DX-500 to fix the color of the colored parts;

[0056] Concentration: 10-15 g / L;

[0057] pH: 5.3-6;

[0058] Temperature: 80-100°C;

[0059] Time: 3-5 minutes;

[0060] D2: Wash with running hot water, put the parts in running hot water for more than 3 times;

[0061] Temperature: 50℃;

[0062] Time: 2 minutes;

[0063] D3: Drying: Blow the parts dry with compressed air and dry them to obtain the finished product.

[0064] The step A1 needs to be cleaned with a brush or other auxiliary tool.

[0065] The chemical degreasing solution of step A2 has the following formula composition: 50 g / L sodium phosphate, 28 g / L sodium silicate, and 45 g / L sodium carbonate.

[0066] The formula of the light emitting solution in step A5 is: 300-500 g / L nitric acid;

[0067] The formula of the alkaline corrosion solution in step A7 is: 40-60 g / L of sodium hydroxide.

[0068] The solution in step B has the following specific components: 150-200 g / L sulfuric acid, 18 g / L oxalic acid, and 40 g / L potassium sodium tartrate.

[0069] The beneficial effects of the present invention are: using bright red 302 to color aluminum-clad parts, and using a sealant to seal and fix the color, can avoid the cumbersome spraying of varnish that is harmful to health, achieve harmless operation and treatment, have bright colors, excellent corrosion resistance, can improve on-site production efficiency, shorten product processing cycle, and have great significance for optimizing production. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0071] Figure 1 It is a schematic diagram of the process structure of the present invention. DETAILED DESCRIPTION

[0072] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below.

[0073] like Figure 1 As shown, a red anodizing process for aviation aluminum alloy products, the specific steps are as follows:

[0074] A. Pretreatment:

[0075] A1: Organic solvent cleaning, put the parts into organic solvent for cleaning for more than 5 minutes;

[0076] A2: Chemical degreasing, put the parts into a chemical solution for degreasing, where the total alkalinity of the solution is equivalent to NaOH of 20-35g / L;

[0077] Temperature: 60℃;

[0078] Time: 10 minutes;

[0079] A3: Wash with running hot water. Put the parts in running hot water for more than 3 times.

[0080] Temperature: 50℃;

[0081] Time: 2 minutes;

[0082] A4: Wash with running cold water. Immerse the parts washed with running hot water in running cold water for cleaning.

[0083] Wherein temperature: room temperature;

[0084] Time: 2 minutes;

[0085] A5: Polishing: To effectively remove the residue after chemical degreasing, put the parts into the following solution for polishing;

[0086] Wherein temperature: room temperature;

[0087] Time: until all the money is sold out;

[0088] A6: Wash with running cold water. Immerse the parts washed with running hot water in running cold water for cleaning.

[0089] Temperature: room temperature;

[0090] Time: 2 minutes;

[0091] A7: Alkali corrosion: put the parts after the cold water washing into the alkaline corrosion tank to remove the oxide scale or surface defects on the surface of the parts;

[0092] Wherein, temperature: 50~60℃;

[0093] Time: less than or equal to 2 minutes, and for precision parts, it should be reduced to no more than 30 seconds;

[0094] A8: Wash with running hot water. Put the parts in running hot water for at least 3 times.

[0095] Temperature: 50℃;

[0096] Time: 2 minutes;

[0097] A9: Wash with running cold water. Immerse the parts washed with running hot water in running cold water for cleaning.

[0098] Temperature: room temperature;

[0099] Time: 2 minutes;

[0100] A10: Polishing: In order to effectively remove the residues after alkali corrosion, put the parts into the following solution for polishing;

[0101] The formula of the light-emitting solution is: 300-500 g / L nitric acid;

[0102] Temperature: room temperature;

[0103] Time: until all the money is sold out;

[0104] A11: Wash with running cold water. Immerse the parts washed with running hot water in running cold water for cleaning.

[0105] Temperature: room temperature;

[0106] Time: 2 minutes;

[0107] B. Anodizing: put the parts washed with running cold water into the solution for anodizing;

[0108] Among them, anode current density: 0.5~2.0A / dm 2 ;

[0109] Temperature: 13-26℃;

[0110] C. Coloring:

[0111] C1: Wash with running cold water. Immerse the anodized parts in running cold water for cleaning. After the aluminum alloy products are anodized with sulfuric acid and colored, they are subjected to color fixing and sealing treatment. The sealing agent DX-500 is used. The color of the colored products is more solid and has the characteristic of not fading for a long time.

[0112] Temperature: room temperature;

[0113] Time: 2 minutes;

[0114] C2: Coloring red, the colored parts are anodized and washed with running cold water, and then colored in bright red 302 organic dye. Bright red 302 is used to color the aluminum-clad parts, and a sealant is used to seal and fix the color, which can avoid the cumbersome spraying of varnish that is harmful to health, and achieve harmless operation. The color is bright, the corrosion resistance is excellent, the production efficiency on site can be improved, the product processing cycle can be shortened, and it has great significance for optimizing production;

[0115] Concentration: 3-10 g / L;

[0116] pH: 5.4-7.4;

[0117] Temperature: 35~55℃;

[0118] Time: 3-5 minutes;

[0119] C3: Wash with running cold water, immerse the colored parts in running cold water for cleaning;

[0120] Temperature: room temperature;

[0121] Time: 2 minutes;

[0122] D. Closed:

[0123] D1: Use sealant DX-500 to fix the color of the colored parts;

[0124] Concentration: 10-15 g / L;

[0125] pH: 5.3-6;

[0126] Temperature: 80-100°C;

[0127] Time: 3-5 minutes;

[0128] D2: Wash with running hot water, put the parts in running hot water for more than 3 times;

[0129] Temperature: 50℃;

[0130] Time: 2 minutes;

[0131] D3: Drying: Blow the parts dry with compressed air and dry them to obtain the finished product.

[0132] The step A1 needs to be cleaned with a brush or other auxiliary tool.

[0133] The chemical degreasing solution of step A2 is formulated as follows: 50 g / L sodium phosphate, 28 g / L sodium silicate, and 45 g / L sodium carbonate. During the chemical degreasing and polishing process, alkaline corrosion, i.e., NaOH treatment, can effectively remove the oxide film on the surface of the parts and effectively activate the surface state of the parts.

[0134] The formula of the polishing solution in step A5 is: 300-500g / L nitric acid; the polishing process is carried out after chemical degreasing and alkaline corrosion, that is, nitric acid can effectively remove the dust after chemical degreasing and alkaline corrosion, and achieve the purpose of bright and clean aluminum alloy surface.

[0135] The formula of the alkaline corrosion solution in step A7 is: 40-60 g / L of sodium hydroxide; the product degreasing process is carried out by using organic solvents and chemical degreasing, that is, alkaline solution method, which has a good degreasing effect and avoids the flammable and explosive risks of conventional gasoline degreasing method.

[0136] The solution in step B has the following specific components: 150-200 g / L sulfuric acid, 18 g / L oxalic acid, and 40 g / L potassium sodium tartrate.

[0137] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A red anodizing process for aviation aluminum alloy products, characterized by: The specific steps are as follows: A. Pretreatment: A1: Organic solvent cleaning, put the parts into organic solvent for cleaning for more than 5 minutes; A2: Chemical degreasing, put the parts into a chemical solution for degreasing, where the total alkalinity of the solution is equivalent to NaOH of 20-35g / L; Temperature: 60℃; Time: 10 minutes; A3: Wash with running hot water. Put the parts in running hot water for more than 3 times. Temperature: 50℃; Time: 2 minutes; A4: Wash with running cold water. Immerse the parts washed with running hot water in running cold water for cleaning. in Temperature: room temperature; Time: 2 minutes; A5: Polishing: To effectively remove the residue after chemical degreasing, put the parts into the following solution for polishing; Wherein temperature: room temperature; Time: until all the money is sold out; A6: Wash with running cold water. Immerse the parts washed with running hot water in running cold water for cleaning. Temperature: room temperature; Time: 2 minutes; A7: Alkali corrosion: put the parts after the cold water washing into the alkaline corrosion tank to remove the oxide scale or surface defects on the surface of the parts; Wherein, temperature: 50~60℃; Time: less than or equal to 2 minutes, and for precision parts, it should be reduced to no more than 30 seconds; A8: Wash with running hot water. Put the parts in running hot water for at least 3 times. Temperature: 50℃; Time: 2 minutes; A9: Wash with running cold water. Immerse the parts washed with running hot water in running cold water for cleaning. Temperature: room temperature; Time: 2 minutes; A10: Polishing: In order to effectively remove the residues after alkali corrosion, put the parts into the following solution for polishing; The formula of the light-emitting solution is: 300-500 g / L nitric acid; Temperature: room temperature; Time: until all the money is sold out; A11: Wash with running cold water. Immerse the parts washed with running hot water in running cold water for cleaning. Temperature: room temperature; Time: 2 minutes; B. Anodizing: put the parts washed with running cold water into the solution for anodizing; Among them, anode current density: 0.5~2.0A / dm 2 ; Temperature: 13-26℃; C. Coloring: C1: Wash with running cold water, immerse the anodized parts in running cold water for cleaning; Temperature: room temperature; Time: 2 minutes; C2: Coloring red, the colored parts are anodized and washed with running cold water, and then colored with bright red 302 organic dye; Concentration: 3-10 g / L; pH: 5.4-7.4; Temperature: 35~55℃; Time: 3-5 minutes; C3: Wash with running cold water, immerse the colored parts in running cold water for cleaning; Temperature: room temperature; Time: 2 minutes; D. Closed: D1: Use sealant DX-500 to fix the color of the colored parts; Concentration: 10-15 g / L; pH: 5.3-6; Temperature: 80-100°C; Time: 3-5 minutes; D2: Wash with running hot water, put the parts in running hot water for more than 3 times; Temperature: 50℃; Time: 2 minutes; D3: Drying: Blow the parts dry with compressed air and dry them to obtain the finished product.

2. The red anodizing process for aviation aluminum alloy products according to claim 1, characterized in that: The step A1 needs to be cleaned with a brush or other auxiliary tool.

3. The red anodizing process for aviation aluminum alloy products according to claim 1, characterized in that: The chemical degreasing solution of step A2 has the following formula composition: 50 g / L sodium phosphate, 28 g / L sodium silicate, and 45 g / L sodium carbonate.

4. The red anodizing process for aviation aluminum alloy products according to claim 1, characterized in that: The formula of the light emitting solution in step A5 is: 300-500 g / L nitric acid.

5. The red anodizing process for aviation aluminum alloy products according to claim 1, characterized in that: The formula of the alkaline corrosion solution in step A7 is: 40-60 g / L of sodium hydroxide.

6. The red anodizing process for aviation aluminum alloy products according to claim 1, characterized in that: The solution in step B has the following specific components: 150-200 g / L sulfuric acid, 18 g / L oxalic acid, and 40 g / L potassium sodium tartrate.

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