CN112430836B - Aluminum alloy dyeing pretreatment agent and pretreatment method - Google Patents
Aluminum alloy dyeing pretreatment agent and pretreatment method Download PDFInfo
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- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/16—Pretreatment, e.g. desmutting
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Abstract
The invention relates to the technical field of aluminum alloy, in particular to an aluminum alloy dyeing pretreatment agent and a pretreatment method. The aluminum alloy dyeing pretreatment agent comprises the following raw materials in parts by weight: 25-30 parts of citric acid, 6-12 parts of salicylic acid, 3-5 parts of sodium citrate, 2-4 parts of potassium sodium tartrate, 0.5-1.5 parts of surfactant and 1-2 parts of functional assistant. The dyeing pretreatment agent can be used for the pretreatment of aluminum alloy anode oxidation dyeing, can obviously improve the dyeing efficiency and uniformity, and improves the dyeing effect and the product yield. The aluminum alloy dyeing pretreatment method using the aluminum alloy dyeing pretreatment agent is simple and convenient to operate and easy to control, can remarkably improve dyeing efficiency and uniformity, improves dyeing effect and product yield, is beneficial to obtaining aluminum alloy dyeing workpieces with uniform color and good appearance effect, and is suitable for industrial mass production.
Description
Technical Field
The invention relates to the technical field of aluminum alloy, in particular to an aluminum alloy dyeing pretreatment agent and a pretreatment method.
Background
Along with the development of society and the progress of science and technology, aluminum alloys are increasingly well applied, and the prior art usually adopts an anodic oxidation process and a dyeing process to improve the durability and the decorative effect of the aluminum alloys of electronic products. However, the existing aluminum alloy workpiece often needs to be connected with other workpieces due to practical application requirements, and is also often provided with a pore channel or a through hole, and a flux region and the pore channel or the through hole often have tiny pores and defects, so that the phenomena of acid substance residue and incomplete cleaning are easily caused in the anodic oxidation process, thereby causing poor defects such as uneven dyeing, flowering, corrosion points and the like, the product yield is low, meanwhile, coloring and uneven dyeing are difficult in the subsequent dyeing process, inconvenience is brought to production, the product yield is low, and further improvement is needed.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide an aluminum alloy dyeing pretreatment agent which can be used for the aluminum alloy anode oxidation dyeing pretreatment, can obviously improve the dyeing efficiency and uniformity, and can improve the dyeing effect and the product yield.
The invention aims to provide an aluminum alloy dyeing pretreatment method by using an aluminum alloy dyeing pretreatment agent, which is simple and convenient to operate, easy to control, capable of remarkably improving dyeing efficiency and uniformity, improving dyeing effect and product yield, beneficial to obtaining an aluminum alloy dyeing workpiece with uniform color and good appearance effect, and suitable for industrial mass production.
The purpose of the invention is realized by the following technical scheme: an aluminum alloy dyeing pretreatment agent comprises the following raw materials in parts by weight: 25-30 parts of citric acid, 6-12 parts of salicylic acid, 3-5 parts of sodium citrate, 2-4 parts of potassium sodium tartrate, 0.5-1.5 parts of surfactant and 1-2 parts of functional assistant.
Further, the surfactant is at least one of sodium monoglyceride disulfate, sodium lauryl sulfate and sodium diisooctyl succinate sulfonate.
According to the invention, the aluminum alloy dyeing pretreatment agent is prepared by compounding citric acid, salicylic acid, sodium citrate, potassium sodium tartrate, the surfactant and the functional assistant, so that the poor dyeing such as spots and the like caused by residual acid at surface holes and defects introduced in the anodic oxidation process and the process before the anodic oxidation of the aluminum alloy workpiece can be prevented, the dyeing efficiency and uniformity can be remarkably improved, the dyeing effect and product yield can be improved, the color blurring problem during dyeing can be reduced, and the aluminum alloy dyeing workpiece with uniform color and good appearance effect can be obtained.
Further, each part of the functional auxiliary agent comprises the following raw materials in parts by weight: 7-10 parts of polyvinyl alcohol, 2-4 parts of sodium acetate, 5-8 parts of glycerol and 3-5 parts of polydimethylsiloxane.
By adopting the raw materials, the invention is beneficial to reducing the corrosion effect on the surface of the aluminum alloy and effectively preventing the surface of the aluminum alloy from generating defects, and the elastic film of bubbles can be damaged in the dyeing pretreatment process, so that the invention has good bubble inhibiting effect, is beneficial to improving the dyeing efficiency and uniformity and improving the dyeing effect and the product yield.
The purpose of the invention is realized by the following technical scheme: an aluminum alloy dyeing pretreatment method adopting the aluminum alloy dyeing pretreatment agent comprises the following steps:
(1) placing the anodized aluminum alloy workpiece in a pretreating agent for preliminary treatment, and then washing with water;
(2) and (3) placing the pre-treated aluminum alloy workpiece in an aluminum alloy dyeing pretreatment agent aqueous solution for pretreatment, and then washing to obtain the aluminum alloy workpiece subjected to dyeing pretreatment.
Further, in the step (1), ultrasonic wave is adopted for preliminary treatment, the preliminary treatment temperature is 30-40 ℃, and the preliminary treatment time is 60-150 s.
Further, in the step (1), the ultrasonic frequency is 50-70 kHz.
Further, in the step (1), the pretreating agent comprises the following raw materials in parts by weight: 20-30 parts of sodium bicarbonate, 4-7 parts of mannitol and 900 parts of deionized water.
According to the invention, the sodium bicarbonate, the mannitol and the deionized water are compounded to prepare the pretreating agent, so that residual acid at surface holes and defects introduced in the anodic oxidation process and the working procedure before the anodic oxidation of the aluminum alloy workpiece is removed, the removing efficiency is high, the residual acid is removed more thoroughly, the sodium bicarbonate can be matched with the mannitol, the corrosion to the surface of the aluminum alloy workpiece is greatly reduced, aluminum sulfate crystals formed on the surface of the aluminum alloy workpiece by oxidation when the aluminum ion content is higher in an anodic oxidation tank can be effectively removed, and the adverse effects of uneven dyeing, generation of corrosion points, flowering and the like in the subsequent dyeing process are prevented.
Further, in the step (2), the temperature for pretreatment by adopting ultrasonic waves is 35-45 ℃, and the pretreatment time is 2-5 min; in the aqueous solution of the dyeing pretreatment agent, the concentration of the dyeing pretreatment agent is 35-60 g/L.
Further, in the step (2), the ultrasonic frequency is 40-50 kHz.
According to the invention, the dyeing pretreatment is carried out by adopting ultrasonic waves, and the steps are strictly controlled, so that the efficiency of the aluminum alloy dyeing pretreatment is improved, the pretreatment effect is improved, and the problems of uneven dyeing, generation of corrosion points, generation of flowers and the like of the aluminum alloy workpiece in the subsequent dyeing process are prevented.
The invention has the beneficial effects that: the dyeing pretreatment agent can be used for the pretreatment of aluminum alloy anode oxidation dyeing, can obviously improve the dyeing efficiency and uniformity, and improves the dyeing effect and the product yield. The aluminum alloy dyeing pretreatment method using the aluminum alloy dyeing pretreatment agent is simple and convenient to operate and easy to control, can remarkably improve dyeing efficiency and uniformity, improves dyeing effect and product yield, is beneficial to obtaining aluminum alloy dyeing workpieces with uniform color and good appearance effect, and is suitable for industrial mass production.
Detailed Description
The present invention will be further described with reference to the following examples for facilitating understanding of those skilled in the art, and the description of the embodiments is not intended to limit the present invention.
Example 1
An aluminum alloy dyeing pretreatment agent comprises the following raw materials in parts by weight: 28 parts of citric acid, 8 parts of salicylic acid, 4 parts of sodium citrate, 3 parts of potassium sodium tartrate, 1 part of surfactant and 1.5 parts of functional assistant.
Further, the surfactant is composed of sodium monoglyceride disulfate and sodium lauryl sulfate according to a weight ratio of 1: 2.
Further, each part of the functional auxiliary agent comprises the following raw materials in parts by weight: 8 parts of polyvinyl alcohol, 3 parts of sodium acetate, 6 parts of glycerol and 4 parts of polydimethylsiloxane.
The aluminum alloy dyeing pretreatment method adopting the aluminum alloy dyeing pretreatment agent comprises the following steps:
(1) placing the anodized aluminum alloy workpiece in a pretreating agent for preliminary treatment, and then washing with water;
(2) and (3) placing the pre-treated aluminum alloy workpiece in an aluminum alloy dyeing pretreatment agent aqueous solution for pretreatment, and then washing to obtain the aluminum alloy workpiece subjected to dyeing pretreatment. The aluminum alloy workpiece is to be dyed.
Furthermore, in the step (1), ultrasonic waves are adopted for preliminary treatment, the preliminary treatment temperature is 35 ℃, and the preliminary treatment time is 120 s. The ultrasonic frequency was 60 kHz.
Further, in the step (1), the pretreating agent comprises the following raw materials in parts by weight: 25 parts of sodium bicarbonate, 6 parts of mannitol and 850 parts of deionized water.
Further, in the step (2), the temperature for pretreatment by using ultrasonic waves is 40 ℃, and the pretreatment time is 4 min. The ultrasonic frequency was 45 kHz. In the aqueous solution of the pre-dyeing treatment agent, the concentration of the pre-dyeing treatment agent is 45 g/L.
Example 2
An aluminum alloy dyeing pretreatment agent comprises the following raw materials in parts by weight: 25 parts of citric acid, 6 parts of salicylic acid, 3 parts of sodium citrate, 2 parts of sodium potassium tartrate, 0.5 part of surfactant and 1 part of functional assistant.
Further, the surfactant sodium lauryl sulfate and the sodium diisooctyl succinate sulfonate are mixed according to the weight ratio of 1: 2.
Further, each part of the functional auxiliary agent comprises the following raw materials in parts by weight: 8 parts of polyvinyl alcohol, 3 parts of sodium acetate, 6 parts of glycerol and 4 parts of polydimethylsiloxane.
The aluminum alloy dyeing pretreatment method adopting the aluminum alloy dyeing pretreatment agent comprises the following steps:
(1) placing the anodized aluminum alloy workpiece in a pretreating agent for preliminary treatment, and then washing with water;
(2) and (3) placing the pre-treated aluminum alloy workpiece in an aluminum alloy dyeing pretreatment agent aqueous solution for pretreatment, and then washing to obtain the aluminum alloy workpiece subjected to dyeing pretreatment.
Furthermore, in the step (1), ultrasonic waves are adopted for preliminary treatment, the preliminary treatment temperature is 30 ℃, and the preliminary treatment time is 150 s. The ultrasonic frequency was 50 kHz.
Further, in the step (1), the pretreating agent comprises the following raw materials in parts by weight: 20 parts of sodium bicarbonate, 4 parts of mannitol and 800 parts of deionized water.
Further, in the step (2), the temperature for pretreatment by using ultrasonic waves is 35 ℃, and the pretreatment time is 5 min. The ultrasonic frequency was 40 kHz. In the aqueous solution of the pre-dyeing treatment agent, the concentration of the pre-dyeing treatment agent is 35 g/L.
Example 3
An aluminum alloy dyeing pretreatment agent comprises the following raw materials in parts by weight: 25-30 parts of citric acid, 12 parts of salicylic acid, 5 parts of sodium citrate, 4 parts of potassium sodium tartrate, 1.5 parts of surfactant and 2 parts of functional assistant.
Further, the surfactant is composed of sodium monoglyceride disulfate and sodium diisooctyl succinate sulfonate according to the weight ratio of 1: 2.
Further, each part of the functional auxiliary agent comprises the following raw materials in parts by weight: 10 parts of polyvinyl alcohol, 4 parts of sodium acetate, 8 parts of glycerol and 5 parts of polydimethylsiloxane.
The aluminum alloy dyeing pretreatment method adopting the aluminum alloy dyeing pretreatment agent comprises the following steps:
(1) placing the anodized aluminum alloy workpiece in a pretreating agent for preliminary treatment, and then washing with water;
(2) and (3) placing the pre-treated aluminum alloy workpiece in an aluminum alloy dyeing pretreatment agent aqueous solution for pretreatment, and then washing to obtain the aluminum alloy workpiece subjected to dyeing pretreatment.
Further, in the step (1), ultrasonic waves are adopted for preliminary treatment, the preliminary treatment temperature is 40 ℃, and the preliminary treatment time is 60 s. The ultrasonic frequency was 50 kHz.
Further, in the step (1), the pretreating agent comprises the following raw materials in parts by weight: 20-30 parts of sodium bicarbonate, 4-7 parts of mannitol and 900 parts of deionized water.
Further, in the step (2), the temperature for pretreatment by using ultrasonic waves is 45 ℃ and the pretreatment time is 2 min. The ultrasonic frequency was 50 kHz. In the aqueous solution of the pre-dyeing treatment agent, the concentration of the pre-dyeing treatment agent is 60 g/L.
Example 4
An aluminum alloy dyeing pretreatment agent comprises the following raw materials in parts by weight: 26 parts of citric acid, 10 parts of salicylic acid, 4 parts of sodium citrate, 3 parts of potassium sodium tartrate, 1.2 parts of surfactant and 1.5 parts of functional assistant.
Further, each part of the functional auxiliary agent comprises the following raw materials in parts by weight: 9 parts of polyvinyl alcohol, 3 parts of sodium acetate, 6 parts of glycerol and 4 parts of polydimethylsiloxane.
The aluminum alloy dyeing pretreatment method adopting the aluminum alloy dyeing pretreatment agent comprises the following steps:
(1) placing the anodized aluminum alloy workpiece in a pretreating agent for preliminary treatment, and then washing with water;
(2) and (3) placing the pre-treated aluminum alloy workpiece in an aluminum alloy dyeing pretreatment agent aqueous solution for pretreatment, and then washing to obtain the aluminum alloy workpiece subjected to dyeing pretreatment.
The rest of this embodiment is similar to embodiment 1, and is not described herein again.
Comparative example 1
The difference between the comparative example and the example 1 is that the aluminum alloy dyeing pretreatment agent comprises the following raw materials in parts by weight: 36 parts of citric acid, 7 parts of sodium citrate and 1 part of surfactant.
The aluminum alloy dyeing pretreatment method adopting the aluminum alloy dyeing pretreatment agent comprises the following steps: and (3) placing the aluminum alloy workpiece subjected to pretreatment in an aluminum alloy dyeing pretreatment agent aqueous solution for pretreatment, and then washing to obtain the aluminum alloy workpiece subjected to dyeing pretreatment. The temperature for pretreatment by ultrasonic is 40 ℃, and the pretreatment time is 4 min. The ultrasonic frequency was 45 kHz.
Taking an aluminum alloy workpiece 6061-T651, wherein the aluminum alloy workpiece is provided with a pore channel, a bulge and a welding part, and carrying out dyeing pretreatment, and the method comprises the following steps:
s1, taking the aluminum alloy workpiece, degreasing the aluminum alloy workpiece, and washing the aluminum alloy workpiece after degreasing and deoiling;
s2, chemically polishing the aluminum alloy workpiece by using a chemical polishing solution, washing with water after polishing, and then removing insoluble metal oxide;
s3, carrying out anodic oxidation on the aluminum alloy workpiece in an anodic oxidation bath solution to form an anodic oxidation film on the metal surface; washing the anodized aluminum alloy workpiece with water to remove residual anodic oxidation bath solution;
s4, removing residual anodic oxidation bath solution and carrying out dyeing pretreatment;
s5, immersing the aluminum alloy workpiece treated by the dyeing pretreatment agent into a dyeing solution, and dyeing the metal surface with color, wherein the concentration of the dye is 4g/L, and the dyeing time is 7 min; washing the dyed aluminum alloy workpiece with water, and then carrying out sealing treatment in nickel salt to obtain a dyed aluminum alloy workpiece; the dye adopts Huaqianghong Hsjt Red 101A.
The degreasing, chemical polishing, anodizing, dyeing and sealing treatments all use raw materials and processes known in the prior art. The step S4 is performed by the pretreatment for dyeing of examples 1 to 4 and comparative example 1, and is referred to as application examples 1 to 4 and application comparative example 1. An aluminum alloy workpiece was used as comparative application example 2 without being subjected to dyeing pretreatment before being subjected to dyeing treatment.
The aluminum alloys obtained in application examples 1 to 4 and application comparative examples 1 to 2 were subjected to appearance test in accordance with GB/T12967.6-2008. The application examples 1 to 4 reduced the defective rate of dyeing by more than 60% compared with the application comparative example 1, and reduced the defective rate of dyeing by more than 90% compared with the application comparative example 2. The aluminum alloy workpieces of examples 1-4 have uniform and stable surface color, no obvious surface defects, no flow color and color variation, no white spots, no mottling and no flow mark, and the color difference delta E on each surface of the aluminum alloy workpiece is less than 0.5. The application of the comparative example 2 has white corrosion points and spots caused by residual acid stains at the welding part, the pore and the gap, and the color difference delta E on each surface of the aluminum alloy workpiece is 0.5-0.8; the application comparative example 1 has a little white corrosion points and spots caused by remaining acid stains at the welding part, the pore and the gap, the number and the area of the spots are smaller than those of the application comparative example 2, and the color difference delta E on each surface of the aluminum alloy workpiece is 0.5-0.7.
The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.
Claims (6)
1. A pretreatment method for dyeing aluminum alloy is characterized in that: the method comprises the following steps:
(1) placing the anodized aluminum alloy workpiece in a pretreating agent for preliminary treatment, and then washing with water;
(2) placing the pre-treated aluminum alloy workpiece in an aluminum alloy dyeing pretreatment agent aqueous solution for pretreatment, and then washing to obtain an aluminum alloy workpiece subjected to dyeing pretreatment;
in the step (1), the pretreating agent comprises the following raw materials in parts by weight: 20-30 parts of sodium bicarbonate, 4-7 parts of mannitol and 900 parts of deionized water;
in the step (2), the concentration of the dyeing pretreatment agent in the dyeing pretreatment agent aqueous solution is 35-60 g/L; the dyeing pretreatment agent comprises the following raw materials in parts by weight: 25-30 parts of citric acid, 6-12 parts of salicylic acid, 3-5 parts of sodium citrate, 2-4 parts of potassium sodium tartrate, 0.5-1.5 parts of surfactant and 1-2 parts of functional assistant; each part of the functional auxiliary agent comprises the following raw materials in parts by weight: 7-10 parts of polyvinyl alcohol, 2-4 parts of sodium acetate, 5-8 parts of glycerol and 3-5 parts of polydimethylsiloxane.
2. The aluminum alloy pretreatment for dyeing according to claim 1, characterized in that: the surfactant is at least one of sodium monoglyceride disulfate, sodium lauryl sulfate and sodium diisooctyl succinate sulfonate.
3. The aluminum alloy dyeing pretreatment method according to claim 1, characterized in that: in the step (1), ultrasonic wave is adopted for preliminary treatment, the preliminary treatment temperature is 30-40 ℃, and the preliminary treatment time is 60-150 s.
4. The aluminum alloy dyeing pretreatment method according to claim 3, characterized in that: in the step (1), the ultrasonic frequency is 50-70 kHz.
5. The aluminum alloy dyeing pretreatment method according to claim 1, characterized in that: in the step (2), the temperature for pretreatment by adopting ultrasonic waves is 35-45 ℃, and the pretreatment time is 2-5 min.
6. The aluminum alloy dyeing pretreatment method according to claim 5, characterized in that: in the step (2), the ultrasonic frequency is 40-50 kHz.
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