A water-based cleaning agent composition used before PVD of stainless steel / aluminum composite materials and a cleaning process based thereon

Abstract

The present invention belongs to the technical field of cleaning before PVD coating, and discloses a water-based cleaning agent composition used before PVD coating of stainless steel / aluminum composite materials and a cleaning process based thereon. The water-based cleaning agent composition of the present invention comprises a degreasing agent A, a neutralizing agent B and a rinsing agent C. The present invention also provides a cleaning process before PVD coating of stainless steel / aluminum composite materials based on the above-mentioned water-based cleaning agent composition, which adopts an ultrasonic cleaning line for cleaning and sequentially comprises three sections: a degreasing section, a neutralizing section, and a rinsing section. The three components of the water-based cleaning agent composition of the present invention are reasonably matched and suitable for cleaning before PVD coating of most metals, especially for cleaning before PVD coating of stainless steel / aluminum composite materials. It not only meets the cleaning requirements before PVD coating of stainless steel / aluminum composite materials, but also does not cause corrosion to the substrate; the yield rate of PVD coating of stainless steel / aluminum composite materials after cleaning with the water-based cleaning agent composition of the present invention can reach more than 94%.

Description

Technical Field

[0001] The present invention belongs to the technical field of cleaning before PVD coating, and in particular relates to a water-based cleaning agent composition used before PVD of a stainless steel / aluminum composite material and a cleaning process based thereon. Background Art

[0002] As smartphones and other electronic products evolve, stainless steel / aluminum composites, previously the primary raw materials for manufacturing stainless steel or aluminum alloys, are gradually being replaced by stainless steel / aluminum composites as the primary new material. These composites combine the strength, corrosion resistance, texture, and aesthetics of stainless steel with the fast heat dissipation, lighter weight, and low signal loss of aluminum alloys.

[0003] Currently, traditional stainless steel pre-PVD cleaning processes typically use strong alkaline or acidic cleaning agents, which can quickly remove dirt, scale, and other impurities from the stainless steel surface, ensuring that the surface cleanliness meets PVD coating requirements. However, for stainless steel / aluminum composite materials, these strong alkaline or acidic cleaning agents can corrode the aluminum alloy, rendering it unusable.

[0004] Patent CN 112030100 A discloses a surface treatment process for copper and aluminum materials before PVD coating, which primarily includes pre-cleaning, wipe cleaning, and plasma cleaning. This process uses large amounts of low-boiling and low-flash point organic solvents, such as isopropyl alcohol, aviation kerosene, n-propyl alcohol, and ethanol, which can pose safety hazards and pose health risks with prolonged exposure. Patent CN 105970153 A discloses a high-precision cleaning process for PVD-coated parts, which includes water wash 1 → air wash 1 → water wash 2 → water wash 3 → water wash 4 → air wash 2 → water wash 5 → saponification → hydrocarbon cleaning → steam drying → plasma cleaning. This cleaning process utilizes extensive vacuum cleaning, which places high demands on equipment. The alternating multiple stages of air and water washing complicate the cleaning process and reduce cleaning efficiency. Furthermore, the large amount of alkaline cleaning agents used in the process is not suitable for cleaning stainless steel / aluminum composite materials.

[0005] Currently, there is no low-cost, safe, environmentally friendly cleaning agent on the market that can meet the cleanliness requirements of stainless steel / aluminum composite material coatings and is safe and non-corrosive to stainless steel and aluminum. Summary of the Invention

[0006] In order to overcome the above-mentioned shortcomings and deficiencies of the prior art, the primary purpose of the present invention is to provide a water-based cleaning agent composition for use before PVD of stainless steel / aluminum composite materials.

[0007] The yield rate of the PVD coating of the stainless steel / aluminum composite material cleaned by the water-based cleaning agent composition of the present invention can reach more than 94%.

[0008] Another object of the present invention is to provide a method for preparing the water-based cleaning agent composition.

[0009] Another object of the present invention is to provide a cleaning process for stainless steel / aluminum composite materials before PVD coating based on the above-mentioned water-based cleaning agent composition.

[0010] The cleaning process based on the water-based cleaning agent composition of the present invention has simple procedures, uses a small amount of cleaning agent, and has environmentally friendly and safe components without causing pollution to the environment.

[0011] The purpose of the present invention is achieved through the following solutions:

[0012] A water-based cleaning agent composition used before PVD of a stainless steel / aluminum composite material comprises a degreasing agent A, a neutralizing agent B and a rinsing agent C.

[0013] Furthermore, the degreasing agent A comprises the following components in percentage by mass: 6-10% C10-16 fatty alcohol polyoxyethylene polyoxypropylene ether, 4-8% sodium cocoyl isethionate, 4-7% 2-hydroxyphosphonoacetic acid, 3-5% tetrasodium glutamate diacetate, 1-3% sodium hydroxide, and the balance water.

[0014] Furthermore, the pH of the degreasing agent A is 8-9.

[0015] Furthermore, the neutralizer B comprises the following components in percentage by mass: 3-8% cocamidopropyl hydroxysulfobetaine, 3-5% polyol phosphonate, 1-3% sodium dihydrogen phosphate, and the balance water.

[0016] Furthermore, the rinse agent C comprises the following components in percentage by mass: 3-5% diethylene glycol, 2-4% maleic acid, and the balance water.

[0017] The present invention also provides a method for preparing the water-based cleaning agent composition, which comprises mixing the degreasing agent A, the neutralizing agent B and the rinsing agent C in proportion and stirring the mixture to obtain the water-based cleaning agent composition.

[0018] Furthermore, the degreasing agent A can be prepared by comprising the following steps: adding 2-hydroxyphosphonoacetic acid and tetrasodium glutamate diacetate to water in proportion and stirring evenly; then adding C10-16 fatty alcohol polyoxyethylene polyoxypropylene ether and sodium cocoyl isethionate and stirring evenly; and then adding sodium hydroxide and stirring evenly to obtain the degreasing agent A.

[0019] Furthermore, after adding sodium hydroxide to the degreasing agent A, the pH value is 8-9.

[0020] Furthermore, the neutralizer B can be prepared by comprising the following steps: adding polyol phosphonate and sodium dihydrogen phosphate to water in proportion and stirring evenly; then adding cocamidopropyl hydroxysulfobetaine and stirring evenly to obtain the neutralizer B.

[0021] Furthermore, the rinse agent C can be prepared by the following steps: mixing diethylene glycol, maleic acid and water in proportion, and stirring evenly to obtain the rinse agent C.

[0022] The above stirring steps can be the same or different and can be stirred for 10-20 minutes respectively.

[0023] The water-based cleaning composition of the present invention comprises a degreaser A, a neutralizer B, and a rinse agent C. These three components are rationally combined to meet the cleaning requirements for stainless steel / aluminum composites prior to PVD coating without causing corrosion to the substrate. Furthermore, each component is safe and environmentally friendly, and the process is simple, meeting the needs of industrial production.

[0024] Degreaser A effectively removes residual dirt, fingerprints, dust, watermarks, and other foreign matter from workpiece surfaces, improving surface cleanliness. Tetrasodium glutamate diacetate utilizes its chelating action to moisten the workpiece surface. A combination of the nonionic surfactant C10-16 fatty alcohol polyoxyethylene polyoxypropylene ether and the anionic surfactant sodium cocoyl isethionate enhances the removal of grease-based stains. The chelating and dispersing action of 2-hydroxyphosphonic acid enhances the removal of particulate matter and provides excellent corrosion inhibition for aluminum. Sodium hydroxide is used to adjust the pH of the formula to 8-9, further enhancing its cleaning effectiveness while protecting stainless steel and aluminum from corrosion damage.

[0025] Neutralizer B effectively neutralizes and removes residual degreasing agents from the workpiece surface and pores, preventing them from residing in the workpiece pores and surfaces. The rapid penetration of cocamidopropyl hydroxysulfobetaine and the dispersing action of polyol phosphonates quickly neutralize and remove residual dirt and agents from the workpiece pores, while sodium dihydrogen phosphate provides a good buffering effect, preventing workpiece corrosion caused by pH fluctuations in the agent.

[0026] Rinse Agent C further rinses residual chemicals from the workpiece surface while moistening the surface to improve its hydrophilicity and avoid watermarks. Diethylene glycol effectively retains moisture, preventing chemical runoff during workpiece transfer, and maleic acid enhances the hydrophilicity of the workpiece surface.

[0027] The yield rate of the PVD coating of the stainless steel / aluminum composite material cleaned by the water-based cleaning agent composition of the present invention can reach more than 94%.

[0028] Furthermore, the present invention also provides a cleaning process for stainless steel / aluminum composite materials before PVD coating based on the above-mentioned water-based cleaning agent composition, which adopts an ultrasonic cleaning line for cleaning and sequentially comprises the following three steps:

[0029] (1) Degreasing process: Use degreasing agent A with a diluted mass concentration of 5-15% and an operating temperature of 70-80°C;

[0030] (2) Neutralization stage: Use neutralizer B with a diluted mass concentration of 10-20% and a temperature of 50-60°C;

[0031] (3) Rinse: Use rinse agent C with a diluted mass concentration of 3-8% and a temperature of 50-60°C.

[0032] Furthermore, the cleaning time of each section is the same or different and is 10-30 minutes.

[0033] Furthermore, dilution can be carried out using water.

[0034] Furthermore, after each section of treatment, it can be cleaned with water before proceeding to the next section of treatment, which can effectively remove residual chemicals and dirt on the surface and pores of the workpiece, ensuring the cleanliness of the workpiece surface.

[0035] For example, after the degreasing process, the workpiece can be ultrasonically rinsed with pure water and then transferred to the neutralization process; the temperature of the pure water used can be 45-55°C, and the ultrasonic rinsing time can be 10-30 minutes.

[0036] For example, after treatment in the neutralization section, the workpiece can be sprayed with pure water and then transferred to the rinsing section; the temperature of the pure water used can be room temperature, and the spraying time can be 10-20 minutes.

[0037] Furthermore, after the rinsing process, the workpiece can be ultrasonically rinsed with pure water and then transferred to slow drawing and baking. The pure water temperature used can be room temperature, and the ultrasonic rinsing time can be 20-40 minutes.

[0038] The cleaning process based on the water-based cleaning agent composition of the present invention has simple procedures, uses a small amount of cleaning agent, and has environmentally friendly and safe components without causing environmental pollution.

[0039] The water-based cleaning composition of the present invention is suitable for pre-PVD cleaning of most metals, particularly stainless steel / aluminum composites. It is safe and non-corrosive to stainless steel / aluminum alloy substrates. The yield rate of PVD coatings on stainless steel / aluminum composites cleaned with the water-based cleaning composition of the present invention can reach over 94%. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below with reference to the examples, but the embodiments of the present invention are not limited thereto. Unless otherwise specified, the materials involved in the following examples can be obtained from commercial channels. The methods described are conventional methods unless otherwise specified.

[0041] In one embodiment, a water-based cleaning agent composition used before PVD of a stainless steel / aluminum composite material comprises a degreasing agent A, a neutralizing agent B, and a rinsing agent C.

[0042] In some preferred embodiments, the degreaser A comprises the following components in mass percentage: 6-10% C10-16 fatty alcohol polyoxyethylene polyoxypropylene ether, 4-8% sodium cocoyl isethionate, 4-7% 2-hydroxyphosphonoacetic acid, 3-5% tetrasodium glutamate diacetate, 1-3% sodium hydroxide, and the balance water.

[0043] In some preferred embodiments, the pH of the degreasing agent A is 8-9.

[0044] In some preferred embodiments, the neutralizer B comprises the following components in percentage by mass: 3-8% cocamidopropyl hydroxysulfobetaine, 3-5% polyol phosphonate, 1-3% sodium dihydrogen phosphate, and the balance water.

[0045] In some preferred embodiments, the rinse agent C comprises the following components in percentage by mass: 3-5% diethylene glycol, 2-4% maleic acid, and the balance water.

[0046] In another embodiment, a method for preparing the above-mentioned water-based cleaning agent composition is provided, wherein the degreasing agent A, the neutralizing agent B and the rinsing agent C are mixed in proportion and stirred to obtain the resultant.

[0047] In some preferred embodiments, the degreasing agent A can be prepared by comprising the following steps: adding 2-hydroxyphosphonoacetic acid and tetrasodium glutamate diacetate to water in proportion and stirring evenly; then adding C10-16 fatty alcohol polyoxyethylene polyoxypropylene ether and sodium cocoyl isethionate and stirring evenly; and then adding sodium hydroxide and stirring evenly to obtain the degreasing agent A.

[0048] In some preferred embodiments, the pH of the degreasing agent A is 8-9 after adding sodium hydroxide.

[0049] In some preferred embodiments, the neutralizer B is prepared by the following steps: adding polyol phosphonate and sodium dihydrogen phosphate to water in proportion and stirring evenly; then adding cocamidopropyl hydroxysulfobetaine and stirring evenly to obtain neutralizer B.

[0050] In some preferred embodiments, the rinse agent C is prepared by the following steps: diethylene glycol, maleic acid and water are mixed in proportion, and stirred evenly to obtain the rinse agent C.

[0051] In some preferred embodiments, the above-mentioned stirring can be the same or different and can be stirred for 10-20 minutes respectively.

[0052] In some preferred embodiments, the degreaser A is prepared by the following steps: adding 2-hydroxyphosphonoacetic acid and tetrasodium glutamate diacetate to water in proportion, stirring for 10-20 minutes at room temperature and pressure; then adding C10-16 fatty alcohol polyoxyethylene polyoxypropylene ether and sodium cocoyl isethionate in sequence, stirring each component for 5-10 minutes before adding the next component, and waiting until all components are added and dissolved; then adding sodium hydroxide to adjust the pH to 8-9, and continuing to stir for 10-20 minutes to obtain the degreaser A.

[0053] In some preferred embodiments, the neutralizer B is prepared by the following steps: adding polyol phosphonate and sodium dihydrogen phosphate to water in proportion, stirring at room temperature and pressure for 10-20 minutes; then adding cocamidopropyl hydroxysulfobetaine and stirring for 10-20 minutes to obtain neutralizer B.

[0054] In some preferred embodiments, the rinse agent C is prepared by the following steps: diethylene glycol, maleic acid and water are mixed in proportion, and stirred at room temperature and pressure for 10-20 minutes.

[0055] The water-based cleaning composition of the present invention comprises a degreaser A, a neutralizer B, and a rinse agent C. These three components are rationally combined to meet the cleaning requirements for stainless steel / aluminum composites prior to PVD coating without causing corrosion to the substrate. Furthermore, each component is safe and environmentally friendly, and the process is simple, meeting the needs of industrial production.

[0056] The yield rate of the PVD coating of the stainless steel / aluminum composite material cleaned by the water-based cleaning agent composition of the present invention can reach more than 94%.

[0057] In another embodiment, a cleaning process for stainless steel / aluminum composite materials before PVD coating based on the above-mentioned water-based cleaning agent composition adopts an ultrasonic cleaning line for cleaning, which comprises the following three steps in sequence:

[0058] (1) Degreasing process: Use degreasing agent A with a diluted mass concentration of 5-15% and an operating temperature of 70-80°C;

[0059] (2) Neutralization stage: Use neutralizer B with a diluted mass concentration of 10-20% and a temperature of 50-60°C;

[0060] (3) Rinse: Use rinse agent C with a diluted mass concentration of 3-8% and a temperature of 50-60°C.

[0061] In some preferred embodiments, the cleaning time of each section is the same or different and is 10-30 minutes.

[0062] In some preferred embodiments, the dilution is performed using water.

[0063] In some preferred embodiments, each section is washed with water before proceeding to the next section, which can effectively remove residual chemicals and dirt on the workpiece surface and in the pores, ensuring the cleanliness of the workpiece surface.

[0064] In some preferred embodiments, after the degreasing process, the workpiece can be ultrasonically rinsed with pure water before being transferred to the neutralization process; the temperature of the pure water used can be 45-55° C., and the ultrasonic rinsing time can be 10-30 minutes.

[0065] In some preferred embodiments, after treatment in the neutralization stage, the workpiece can be sprayed with pure water and then transferred to the rinsing stage; the temperature of the pure water used can be room temperature, and the spraying time can be 10-20 minutes.

[0066] In some preferred embodiments, after the rinsing stage, the workpiece can be ultrasonically rinsed with pure water and then transferred to slow drawing and baking. The pure water temperature used can be room temperature, and the ultrasonic rinsing time can be 20-40 minutes.

[0067] The relevant data of the examples are shown in Table 1 below (unit: wt%), the cleaning agent components: A represents a degreasing agent, B represents a neutralizing agent, and C represents a rinsing agent. The pH of the degreasing agent A in Examples 1-3 is 8-9.

[0068] Table 1

[0069]

[0070] The above embodiments are all implemented using the following cleaning process:

[0071] (1) In the degreasing section, use degreasing agent A with a mass concentration of 10%, a temperature of 75±5℃, ultrasonic cleaning for 20 minutes, ultrasonic rinsing with pure water at 50±5℃ for 20 minutes, and then proceed to the neutralization section.

[0072] (2) In the neutralization section, use a neutralizer B with a mass concentration of 15%, a temperature of 55±5°C, ultrasonic cleaning for 15 minutes, spraying with room temperature pure water for 15 minutes, and then proceed to the rinsing section.

[0073] (3) In the rinsing process, use a 5% mass concentration of rinsing agent C, a temperature of 55±5°C, ultrasonic cleaning for 10 minutes, ultrasonic rinsing with room temperature pure water for 30 minutes, and then switching to slow pulling and baking.

[0074] After testing, the yield rate of the workpiece after PVD and the aluminum material conditions of Examples 1-3 are shown in Table 2.

[0075] Table 2

[0076] Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 PVD coating yield 94.91％ 96.27％ 95.73％ 94.63％ 91.52％ Dirt causes poor coating 2.85％ 1.31％ 1.75％ 2.64％ 4.35％ Watermarks cause poor coating 1.15％ 1.22％ 1.47％ 1.56％ 2.26％ Other factors that lead to poor coating 1.09％ 1.20％ 1.05％ 1.17％ 1.87％ Aluminum Appearance Rating* Level 0 Level 0 Level 0 Level 2 Level 0 Stainless Steel Appearance Rating* Level 0 Level 0 Level 0 Level 0 Level 0

[0077] *Refer to GB / T 35759-2017

[0078] As shown in Table 2, the water-based cleaning composition of the present invention, comprising degreaser A, neutralizer B, and rinse agent C, is optimally combined to meet the cleaning requirements for PVD coating of stainless steel / aluminum composite materials without causing corrosion to the substrate. Furthermore, each component is safe and environmentally friendly, and the process is simple, meeting the requirements of industrial production. The yield rate of PVD coatings on stainless steel / aluminum composite materials cleaned with the water-based cleaning composition of the present invention can reach over 94%.

[0079] The above embodiments are preferred implementations of the present invention, but the implementations of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A water-based cleaning agent composition used before PVD of stainless steel / aluminum composite materials, characterized in that Including degreasing agent A, neutralizing agent B and rinsing agent C; The degreaser A comprises the following components in percentage by mass: 6-10% C10-16 fatty alcohol polyoxyethylene polyoxypropylene ether, 4-8% sodium cocoyl isethionate, 4-7% 2-hydroxyphosphonoacetic acid, 3-5% tetrasodium glutamate diacetate, 1-3% sodium hydroxide, and the balance water; The neutralizer B comprises the following components in percentage by mass: 3-8% cocamidopropyl hydroxysulfobetaine, 3-5% polyol phosphonate, 1-3% sodium dihydrogen phosphate, and the balance water; The rinse agent C comprises the following components in percentage by mass: 3-5% diethylene glycol, 2-4% maleic acid, and the balance water.

2. The water-based cleaning composition according to claim 1, wherein: The pH of the degreasing agent A is 8-9.

3. A method for preparing the water-based cleaning composition according to any one of claims 1 to 2, characterized in that: The degreasing agent A, the neutralizing agent B and the rinsing agent C are respectively mixed in proportion and stirred evenly to obtain the product.

4. The preparation method according to claim 3, wherein: The degreasing agent A is prepared by the following steps: adding 2-hydroxyphosphonoacetic acid and tetrasodium glutamate diacetate to water in proportion and stirring evenly; then adding C10-16 fatty alcohol polyoxyethylene polyoxypropylene ether and sodium cocoyl isethionate and stirring evenly; and then adding sodium hydroxide and stirring evenly to obtain the degreasing agent A.

5. The preparation method according to claim 3, wherein: The neutralizer B is prepared by the following steps: adding polyol phosphonate and sodium dihydrogen phosphate into water according to proportion and stirring evenly; then adding cocamidopropyl hydroxysulfobetaine and stirring evenly to obtain the neutralizer B.

6. The preparation method according to any one of claims 3 to 5, characterized in that: The stirring is the same or different and is stirred for 10-20 minutes respectively.

7. A cleaning process for stainless steel / aluminum composite materials before PVD coating based on the water-based cleaning agent composition according to any one of claims 1-2, characterized in that Ultrasonic cleaning line is used for cleaning, which includes the following three sections: (1) Degreasing process: Use degreasing agent A with a diluted mass concentration of 5-15% and an operating temperature of 70-80°C; (2) Neutralization section: Use neutralizer B with a diluted mass concentration of 10-20% and a temperature of 50-60°C; (3) Rinse process: Use rinse agent C with a diluted mass concentration of 3-8% and an operating temperature of 50-60℃.

8. The cleaning process before PVD coating of the stainless steel / aluminum composite material according to claim 7, characterized in that: The cleaning time of each section is the same or different, ranging from 10 to 30 minutes.

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