Preparation method of wear-resistant anti-collapsing and anti-abrasion paint layer on surface of active alloy part

Abstract

The invention discloses a preparation method of a wear-resistant anti-collapse-abrasion paint layer on the surface of an active alloy part, which comprises the following steps: (1) mixing compressed inert gas and an abrasive to obtain a high-pressure abrasive, and spraying the high-pressure abrasive to the surface of the active alloy part in an inert atmosphere; (2) putting the active alloy part into a dewaxing water solution or a potassium permanganate water solution and carrying out ultrasonic treatment; (3) spraying the bonding layer mixed solution on the surface of the active alloy part, and heating by adopting a first sectional type program for curing to form a bonding layer; (4) spraying the multi-color layer mixed solution on the surface of the bonding layer, and heating by adopting a second sectional type program for curing to form a multi-color layer; (5) spraying the protective layer mixed solution on the surface of the multi-color layer, and heating by adopting a third sectional type program for curing to form a protective layer; wherein the protective layer mixed solution comprises a bouncing agent. Through the preparation method, the paint layer with excellent wear resistance and cracking resistance can be prepared on the surface of the active alloy part.

Description

Technical Field

[0001] The invention belongs to the technical field of metal part surface spraying, and in particular relates to a method for preparing a wear-resistant and anti-fragmentation paint layer on the surface of an active alloy part. Background Art

[0002] With the popularity and application of hardware products, consumers have put forward higher requirements for hardware crafts in luxury luggage, especially the visual effects and appearance. At present, traditional spraying technology is widely used to form a variety of color combinations on the surface of ceramics, hardware crafts or gemstones. However, in daily use, these metal crafts with colored paint layers are often at risk of collision or scratching, and are prone to scratches or paint peeling, which inevitably affects the aesthetics and overall visual effect of the product.

[0003] In view of the situation that the surface of the stainless steel workpiece is smooth or the roughness is uneven, which makes the bonding layer difficult to adhere or easy to fall off, the industry usually adopts the sandblasting process to improve the fatigue resistance of the workpiece and enhance the adhesion between the workpiece surface and the paint layer. Specifically, by using abrasives of different particle sizes for sandblasting, different degrees of surface roughness can be achieved, thereby significantly improving the roughness of the metal surface, which enables the bonding layer to be more effectively and evenly attached to the stainless steel surface, ensuring the stability and durability of the paint layer. However, the paint layer formed on the surface of the active alloy part by the sandblasting process is easy to scratch or fall off when subjected to external force. It is generally believed by those skilled in the art that the paint layer is not thick enough, resulting in poor bonding between the paint layer and the surface of the active alloy part. Therefore, the thickness of the paint layer is usually increased to improve the wear resistance and anti-fall performance. However, although the method of increasing the thickness of the paint layer can enhance the hardness of the product, it also increases the brittleness of the paint layer, reduces its impact resistance, and increases the production cost, which is not conducive to large-scale industrial production.

[0004] Therefore, there is an urgent need for a method for preparing a wear-resistant and anti-friction paint layer on the surface of an active alloy part to solve the shortcomings of the existing technical problems. Summary of the invention

[0005] The prior art generally believes that the poor adhesion between the paint layer and the surface of the active alloy part is caused by the paint layer not being applied thick enough. However, the inventor of this application has found through repeated research that the oxidation of the surface of the active alloy part, the corrosion of the surface of the active alloy part by the type of cleaning agent, and the curing method of the paint layer will affect the wear resistance and anti-friction performance of the paint layer. The details are as follows: The sandblasting process will destroy the original protective layer on the surface of the active alloy parts, so that the surface of the active alloy parts is exposed to the air and quickly forms an uneven oxide layer. The corrosion of the surface of the active alloy parts by oxygen is relatively slow, which cannot be observed on site with the naked eye and does not attract the attention of on-site operators. The inventors of this application found that this oxide layer affects the uniformity of the surface roughness of the active alloy parts. At the same time, the mechanical properties of the oxide layer are poor. When the subsequent spray paint layer is covered, the surface bonding layer and the metal surface are not well bonded, affecting the wear resistance and impact resistance of the paint layer.

[0006] If general chemical solvents (such as alcohol or ethyl acetate) are used to clean the surface of active alloy parts before spraying paint, these chemical solvents will cause rapid corrosion of the surface of active alloy parts. For example, alcohol causes copper to corrode rapidly to form green oxides, and alcohol causes aluminum to corrode slowly to form white oxides. The inventors of the present application have found that such corrosion will also lead to poor bonding between the surface bonding layer and the metal surface, affecting the wear resistance and impact resistance of the paint layer.

[0007] The use of a segmented direct heating method to form a low-temperature film on the paint layer and then cure it at high temperature can also cause problems with the paint layer coated on the surface of active alloy parts. Specifically, when the applied paint layer is directly placed in an environment of 70~100℃ from room temperature for initial curing, some volatile gases fail to evaporate in time but remain locked in the paint layer and cannot escape from the paint layer; then when the paint layer is suddenly placed in an environment of 150~200℃ for further curing, some volatile gases that do not have time to evaporate and remain in the paint layer further expand, resulting in many tiny bubbles on the surface of the active metal layer, which ultimately affects the wear resistance and impact resistance of the paint layer on the surface of the active alloy parts.

[0008] In summary, the purpose of the present invention is to provide a method for preparing a wear-resistant and chipping-resistant paint layer on the surface of an active alloy part, by which a paint layer with excellent wear resistance and chipping resistance can be prepared on the surface of an active alloy part.

[0009] To achieve the above objectives, the present invention provides a method for preparing a wear-resistant and anti-fragmentation paint layer on the surface of an active alloy part, the steps comprising: (1) Mixing compressed inert gas and abrasive to obtain high-pressure abrasive, and then spraying the high-pressure abrasive onto the surface of the active alloy part in an inert atmosphere; (2) placing the active alloy part obtained in step (1) into a dewaxing aqueous solution or a potassium permanganate aqueous solution and subjecting it to ultrasonic treatment, and then sequentially subjecting it to washing and vacuum drying treatment; (3) spraying the bonding layer mixture onto the surface of the active alloy part obtained in step (2) and curing it by a first segmented temperature program to form a bonding layer; (4) spraying the multi-color layer mixture onto the surface of the bonding layer and curing it by a second segmented temperature program to form a multi-color layer; (5) spraying the protective layer mixture onto the surface of the multi-color layer and curing it by a third segmented temperature program to form a protective layer; The protective layer mixed liquid includes an elasticizing agent.

[0010] Compared with the prior art, the preparation method provided by the present invention has the following beneficial effects: 1. The present invention uses compressed inert gas instead of traditional air as the sandblasting power and performs sandblasting in an inert atmosphere, which effectively avoids oxidation reaction on the surface of active metal alloy parts during sandblasting, thereby significantly improving the bonding strength between the bonding layer and the active alloy parts and reducing the problem of bonding layer shedding caused by oxidation.

[0011] 2. The present invention uses dewaxing water or potassium permanganate aqueous solution as a cleaning agent and combines it with ultrasonic treatment to efficiently remove burrs, residual wax or other impurities on the surface of active alloy parts; at the same time, dewaxing water or potassium permanganate aqueous solution has low chemical corrosion to the surface of active alloy parts, which improves the bonding strength between the bonding layer and the active alloy parts and reduces the risk of the bonding layer falling off due to corrosion. In addition, the use of dewaxing water or potassium permanganate aqueous solution instead of traditional organic solvents avoids the potential harm of organic solvent volatilization to human health and significantly reduces the risk of flash explosions in processing workshops.

[0012] 3. The present invention sprays the bonding layer mixture, the multi-color layer mixture and the protective layer mixture on the surface of the active alloy part in sequence. After each layer is sprayed, a segmented programmed temperature rise method is used to promote the solidification of each layer of the mixture. The segmented programmed temperature rise controls the temperature to gradually increase, so that each layer slowly dries and forms a film under low temperature conditions, and the organic solvent can evaporate smoothly and fully. This can avoid the local solvent from escaping due to the film-forming chemical reaction being too fast, and being locked in the film-formed paint layer, thereby preventing the generation of many tiny bubbles in the subsequent high-temperature treatment process, and ultimately greatly improving the bonding strength between the bonding layer and the active alloy part, the bonding strength between the bonding layer and the multi-color layer, and the bonding strength between the multi-color layer and the protective layer, effectively avoiding the paint layer from falling off after being impacted by external force, so that the paint layer on the surface of the active alloy part has excellent wear resistance and anti-cracking performance. The technical scheme of the present invention is widely used in jewelry products made of metal, such as Pull cards, middle needle buckles, card ornaments, pendant decorations, furniture ornaments, etc.

[0013] 4. The present invention introduces an elastifier into the protective layer mixture. When the protective layer on the surface of the active alloy part falls or collides in daily life, the elastifier can absorb part of the impact energy and play a buffering role, thereby effectively preventing the protective layer from being damaged due to falling or other physical impacts, thereby reducing the risk of the underlying multi-color layer being exposed or damaged after the protective layer is damaged. Therefore, the introduction of an elastifier into the protective layer mixture can further improve the wear resistance and anti-peeling and film collapse performance of the paint layer.

[0014] Furthermore, step (1) of the present invention includes mixing compressed nitrogen or compressed argon with abrasive to obtain high-pressure abrasive, and then spraying the high-pressure abrasive onto the surface of the active alloy part in a nitrogen or carbon dioxide atmosphere to make the surface roughness of the active alloy part 0.1-3.0 μm. Specifically, the abrasive and the compressed inert gas are fully mixed in a pressure tank, and then the high-pressure abrasive is pressed into the sand delivery pipe through a sand outlet valve, and then the high-pressure abrasive is sprayed onto the surface of the active alloy part through a nozzle to enhance the surface roughness of the active alloy part.

[0015] Furthermore, the spraying parameters in step (1) of the present invention include: pressure of 0.5-0.7 MPa, angle of 60-75°, distance of 180-230 mm, and time of 5-8 s.

[0016] Furthermore, in step (2) of the present invention, the dewaxing water solution is a mixture of deionized water and dewaxing water in a mass ratio of 25-30:1; the potassium permanganate aqueous solution is a mixture of deionized water, potassium permanganate, and isooctyl alcohol polyoxyethylene ether penetrant in a mass ratio of 50:1:1.

[0017] Furthermore, step (2) of the present invention comprises placing the active alloy obtained in step (1) into a dewaxing aqueous solution or a potassium permanganate aqueous solution and heating it to 80-95° C. and then subjecting it to ultrasonic treatment for 3-5 minutes. Specifically, the frequency of the ultrasonic treatment is 60-120 kHz.

[0018] Furthermore, the cleaning in step (2) of the present invention includes, in sequence, 360° vibration washing with water and soaking in hot water at 75-90°C. Specifically, the 360° vibration washing with water in step (2) is specifically as follows: the active alloy part is fixed on a high-frequency vibration device, and the surface of the active alloy part is fully rinsed 360° with deionized water, thereby achieving a vibration cleaning effect to avoid dewaxing water or potassium permanganate remaining on the surface of the workpiece; the time for comprehensive washing can be specifically 2-4 minutes. Specifically, the time for hot water soaking is 3-5 minutes, and the hot water soaking is to avoid contamination by ionic impurities in ordinary water.

[0019] Furthermore, in step (2) of the present invention, the vacuum drying treatment is carried out in a vacuum box. The use of a vacuum box for drying can effectively reduce the oxidation corrosion on the surface of the active alloy parts at high temperatures, while accelerating the evaporation and drying of water to improve efficiency. The temperature of the vacuum drying treatment is 85-100°C, the vacuum degree is -0.02-0.04Mpa, and the time is 10-15min.

[0020] Furthermore, the parameters of the first staged programmed temperature rise and the second staged programmed temperature rise of the present invention are independent of each other: heating from room temperature to 70-90°C at a heating rate of 1-2°C / min and then keeping warm for 5-10 minutes, and then heating to 160-180°C at a heating rate of 4-5°C / min and then keeping warm for 5-10 minutes.

[0021] Furthermore, the parameters of the third staged programmed temperature increase of the present invention are: heating from room temperature to 70-90°C at a heating rate of 1-2°C / min, then keeping warm for 5-10 minutes, and then heating to 150-170°C at a heating rate of 4-5°C / min, then keeping warm for 5-10 minutes.

[0022] Furthermore, the thickness of the adhesive layer of the present invention is 10-20 μm; the thickness of the multicolor layer and the protective layer are independently 15-20 μm. For example, the thickness of the adhesive layer can be, but not limited to, 10 μm, 13 μm, 15 μm, 18 μm, 20 μm; the thickness of the multicolor layer can be, but not limited to, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm; the thickness of the protective layer can be, but not limited to, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm.

[0023] Furthermore, the adhesive layer mixture of the present invention comprises, by weight, 100 to 120 parts of transparent coating, 10 to 15 parts of hardener, and 80 to 90 parts of diluent. Specifically, the content of transparent coating may be, but not limited to, 100 parts, 105 parts, 110 parts, 113 parts, 117 parts, and 120 parts; the content of hardener may be, but not limited to, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, and 15 parts; the content of diluent may be, but not limited to, 80 parts, 84 parts, 88 parts, and 90 parts. Among them, the transparent coating is epoxy resin or polyurethane resin, the hardener is polyetheramine resin or polyurethane resin, and the diluent is selected from at least one of ethyl acetate, DBE dibasic ester (CAS: 95481-62-2), n-butanol, and diethylene glycol monobutyl ether. Preferably, the diluent is a mixture of ethyl acetate, DBE dibasic ester, n-butanol and diethylene glycol monobutyl ether in a mass ratio of 2:1:1:1 or 3:2:1:1.

[0024] Furthermore, the multi-color layer mixed liquid of the present invention comprises, by weight, 30 to 40 parts of transparent coating, 50 to 70 parts of colorant, 10 to 15 parts of curing agent, and 90 to 110 parts of diluent. Specifically, the content of transparent coating may be, but not limited to, 30 parts, 32 parts, 34 parts, 36 parts, 38 parts, and 40 parts; the content of colorant may be, but not limited to, 50 parts, 54 parts, 58 parts, 62 parts, 65 parts, 68 parts, and 70 parts; the content of curing agent may be, but not limited to, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, and 15 parts; the content of diluent may be, but not limited to, 90 parts, 95 parts, 98 parts, 103 parts, 107 parts, and 110 parts. The transparent coating is epoxy resin or polyurethane resin, the curing agent is polyetheramine resin or polyurethane resin, the diluent is selected from at least one of ethyl acetate, butyl acetate, n-butanol, and xylene; the colorant is EP epoxy resin paste or MESOPU® paste series. Preferably, the diluent is ethyl acetate, butyl acetate, n-butanol, and xylene mixed in a mass ratio of 2:2:1:1.

[0025] Furthermore, the protective layer mixed liquid of the present invention comprises, by mass, 100-130 parts of varnish, 25-45 parts of elastomer, and 80-90 parts of diluent. Specifically, the content of varnish may be, but not limited to, 100 parts, 105 parts, 110 parts, 115 parts, 120 parts, 125 parts, and 130 parts; the content of elastomer may be, but not limited to, 25 parts, 30 parts, 34 parts, 38 parts, 40 parts, 42 parts, and 45 parts; the content of diluent may be, but not limited to, 80 parts, 83 parts, 85 parts, 88 parts, and 90 parts. Among them, the varnish is acrylic resin or polyurethane acrylate, and the diluent is selected from at least one of butyl acetate, n-butanol, isobutanol, and xylene. Preferably, the diluent is butyl acetate, n-butanol, isobutanol, and xylene mixed in a ratio of 2:2:1:1.

[0026] Furthermore, the elastifier of the present invention is styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS) or a blend (TPO) of PP as a hard segment and EPDM as a soft segment.

[0027] Furthermore, step (3) of the present invention comprises using a reciprocating sprayer to spray the bonding layer mixture onto the surface of the active alloy part obtained in step (2). Furthermore, step (4) of the present invention includes spraying the multi-color layer mixture onto the surface of the bonding layer using a reciprocating sprayer.

[0028] Furthermore, step (5) of the present invention includes spraying the protective layer mixture onto the surface of the multi-color layer using a reciprocating sprayer. Specifically, the reciprocating sprayer used in steps (3) to (5) has the advantages of fast coating speed, stable spraying quality, and reduced coating costs. It can also make the thickness of the bonding layer, the multi-color layer, and the protective layer uniform, and the appearance quality such as glossiness and color is high, and it saves time and effort.

[0029] Furthermore, the active alloy part of the present invention is an alloy part made of relatively active metals (such as aluminum, copper, magnesium, zinc, etc.). For example, the active alloy part can be an aluminum-zinc alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a microscopic inspection image of the surface of the active alloy part obtained in Example 2.

[0031] Figure 2 This is a microscopic inspection image of the surface of the active alloy part obtained in Comparative Example 7.

[0032] Figure 3 This is a diagram showing the effect of the active alloy surface obtained in Example 2 after the wear resistance test.

[0033] Figure 4 This is a diagram showing the effect of the surface of the active alloy part obtained in Example 3 after the wear resistance test.

[0034] Figure 5 This is a diagram showing the effect of the active alloy surface obtained in Comparative Example 4 after the wear resistance test.

[0035] Figure 6 This is a diagram showing the effect of the surface of the active alloy part obtained in Comparative Example 5 after the wear resistance test.

[0036] Figure 7 This is a diagram showing the effect of the surface of the active alloy part obtained in Comparative Example 7 after the wear resistance test.

[0037] Figure 8 This is a diagram showing the effect of the surface of the active alloy part obtained in Example 1 after a drop test.

[0038] Fig. 9 This is a diagram showing the effect of the surface of the active alloy part obtained in Comparative Example 1 after a drop test.

[0039] Fig.10 This is a diagram showing the effect of the surface of the active alloy part obtained in Comparative Example 2 after the drop test.

[0040] Fig.11 This is a diagram showing the effect of the surface of the active alloy part obtained in Comparative Example 3 after the drop test.

[0041] Fig.12 This is a diagram showing the effect of the surface of the active alloy part obtained in Example 2 after a drop test.

[0042] Fig.13 This is a diagram showing the effect of the surface of the active alloy part obtained in Example 3 after a drop test.

[0043] Fig.14 This is a diagram showing the effect of the surface of the active alloy part obtained in Comparative Example 4 after a drop test.

[0044] Fig.15 This is a diagram showing the effect of the surface of the active alloy part obtained in Comparative Example 5 after a drop test.

[0045] Fig.16 This is a diagram showing the effect of the surface of the active alloy part obtained in Comparative Example 7 after the drop test.

[0046] Fig.17 This is a diagram showing the effect of the surface of the active alloy part obtained in Comparative Example 8 after a drop test. DETAILED DESCRIPTION

[0047] In order to better illustrate the purpose, technical scheme and beneficial effects of the present invention, the present invention will be further described below in conjunction with specific embodiments. It should be noted that the following implementation method is a further explanation of the present invention and should not be used as a limitation of the present invention.

[0048] The sources of each material are as follows: The polyurethane resin was purchased from KLASSIM® solvent-based two-component in-mold paint KLASSIM® Solvent base 2K Syatems from BOMEX Chemical Shanghai Co., Ltd. The polyurethane curing agent was purchased from Tosoh Corporation of Japan, model HXR90b; The blend of PP as hard segment and EPDM as soft segment was purchased from Guangdong Lien Industrial Co., Ltd. TPE thermoplastic elastomer model; Polyurethane acrylate was purchased from Guangdong Ruisheng New Material Technology Co., Ltd. Model RU-3110B; Wax remover was purchased from Dongguan Haoquan Chemical Co., Ltd. Model HQ-128; The epoxy resin was purchased from the transparent epoxy resin paint of Langfang Tengji Environmental Protection Technology Co., Ltd. The polyetheramine resin was purchased from Hafotex®CA-3397 polyetheramine modified curing agent of Guangzhou Haoyi New Materials Technology Co., Ltd.

[0049] Example 1 This embodiment provides a method for preparing a wear-resistant and anti-fragmentation paint layer on the surface of an active alloy part, the steps comprising: (1) Compressed nitrogen and abrasive are mixed in a pressure tank to obtain high-pressure abrasive, and then the high-pressure abrasive is pressed into a sand delivery pipe through a sand outlet valve, and the high-pressure abrasive is sprayed onto the surface of an aluminum-zinc alloy workpiece through a nozzle under a nitrogen atmosphere, and the roughness of the surface of the aluminum-zinc alloy workpiece is made to be 2 μm; wherein the spraying parameters include: pressure of 0.7 MPa, angle of 65°, distance of 200 mm, and time of 7 s; (2) placing the active alloy part obtained in step (1) into a potassium permanganate aqueous solution and heating it to 80°C, then subjecting it to ultrasonic treatment for 3 minutes, and then successively subjecting the surface of the active alloy part to 360° vibration washing for 4 minutes with deionized water, soaking it in 75°C deionized water for 5 minutes, and drying it in a vacuum oven at 85°C and -0.02MPa for 10 minutes; wherein the potassium permanganate aqueous solution is a mixture of deionized water, potassium permanganate, and isooctyl alcohol polyoxyethylene ether penetrant in a mass ratio of 50:1:1; and the frequency of the ultrasonic treatment is 80 kHz; (3) using a reciprocating sprayer to spray the bonding layer mixture onto the surface of the active alloy part obtained in step (2), and heating the mixture from room temperature to 70°C at a heating rate of 1°C / min, then keeping the temperature for 8 min, then heating the mixture to 160°C at a heating rate of 4°C / min, then keeping the temperature for 7 min, and naturally cooling the mixture to obtain a bonding layer with a thickness of 10 μm; (4) Spray the multi-color layer mixture onto the surface of the bonding layer using a reciprocating sprayer and heat the mixture from room temperature to 75°C at a heating rate of 1°C / min and then keep the temperature for 8 minutes. Then heat the mixture to 160°C at a heating rate of 4°C / min and keep the temperature for 8 minutes. After natural cooling, a multi-color layer with a thickness of 15 μm is obtained. (5) The protective layer mixture is sprayed on the surface of the multi-color layer by a reciprocating sprayer and the temperature is raised from room temperature to 80°C at a heating rate of 1°C / min and then kept at that temperature for 7 minutes. The temperature is then raised to 150°C at a heating rate of 4°C / min and then kept at that temperature for 8 minutes. After natural cooling, a multi-color layer with a thickness of 15 μm is obtained. The bonding layer mixture includes 100 parts of transparent coating, 10 parts of hardener, and 80 parts of diluent. The transparent coating is polyurethane resin, the hardener is polyurethane curing agent, and the diluent is ethyl acetate, dibasic ester DBE, n-butanol, and diethylene glycol monobutyl ether mixed in a ratio of 2:1:1:1. The multi-color layer mixed liquid includes, by weight, 30 parts of transparent coating, 50 parts of colorant, 10 parts of curing agent, and 90 parts of diluent; the transparent coating is polyurethane resin, the curing agent is polyurethane curing agent, the colorant is MESOPU® color paste series yellow colorant of BOMEX Chemical, and the diluent is ethyl acetate, butyl acetate, n-butanol, and xylene mixed in a weight ratio of 2:2:1:1; The protective layer mixture includes, by mass, 100 parts of varnish, 25 parts of elastomer, and 80 parts of diluent; the varnish is polyurethane acrylate, the elastomer is a blend of PP as a hard segment and EPDM as a soft segment, and the diluent is a mixture of butyl acetate, n-butanol, isobutanol, and xylene in a ratio of 2:2:1:1.

[0050] Example 2 This embodiment provides a method for preparing a wear-resistant and anti-fragmentation paint layer on the surface of an active alloy part, the steps comprising: (1) Compressed nitrogen and abrasive are mixed in a pressure tank to obtain high-pressure abrasive, and then the high-pressure abrasive is pressed into a sand delivery pipe through a sand outlet valve, and the high-pressure abrasive is sprayed onto the surface of an aluminum-zinc alloy workpiece through a nozzle under a nitrogen atmosphere, and the roughness of the surface of the aluminum-zinc alloy workpiece is made to be 3 μm; wherein the spraying parameters include: pressure of 0.7 MPa, angle of 70°, distance of 200 mm, and time of 8 s; (2) placing the active alloy part obtained in step (1) into a dewaxed water solution and heating it to 90°C and then subjecting it to ultrasonic treatment for 4 minutes, then successively subjecting the surface of the active alloy part to 360° vibration washing for 3 minutes with deionized water, soaking it in deionized water at 88°C for 5 minutes, and drying it in a vacuum box at 95°C and -0.04MPa for 13 minutes; wherein the dewaxed water solution is a mixture of deionized water and dewaxed water in a mass ratio of 25:1; and the frequency of the ultrasonic treatment is 80 kHz; (3) using a reciprocating sprayer to spray the bonding layer mixture onto the surface of the active alloy part obtained in step (2), and heating the mixture from room temperature to 80°C at a heating rate of 1.5°C / min, then keeping the temperature for 5 min, and then heating the mixture to 170°C at a heating rate of 4.5°C / min, then keeping the temperature for 5 min, and naturally cooling the mixture to obtain a bonding layer with a thickness of 15 μm; (4) The multi-color layer mixture is sprayed on the surface of the bonding layer by a reciprocating sprayer and the temperature is raised from room temperature to 80°C at a heating rate of 1.5°C / min and then kept at this temperature for 5 minutes. The temperature is then raised to 170°C at a heating rate of 4.5°C / min and then kept at this temperature for 5 minutes. After natural cooling, a multi-color layer with a thickness of 18 μm is obtained. (5) The protective layer mixture is sprayed on the surface of the multi-color layer by a reciprocating sprayer and the temperature is raised from room temperature to 80°C at a heating rate of 1.5°C / min and then kept at that temperature for 5 minutes. The temperature is then raised to 160°C at a heating rate of 4.5°C / min and then kept at that temperature for 5 minutes. After natural cooling, a multi-color layer with a thickness of 18 μm is obtained. The bonding layer mixture includes 110 parts of transparent coating, 12 parts of hardener, and 85 parts of diluent. The transparent coating is epoxy resin, the hardener is polyetheramine resin, and the diluent is ethyl acetate, dibasic ester DBE, n-butanol, and diethylene glycol monobutyl ether in a ratio of 3:2:1:1. The multi-color layer mixed liquid includes, by weight, 35 parts of transparent coating, 60 parts of colorant, 13 parts of curing agent, and 100 parts of diluent; the transparent coating is polyurethane resin, the curing agent is polyurethane curing agent, the colorant is MESOPU® color paste series red colorant of BOMEX Chemical, and the diluent is ethyl acetate, butyl acetate, n-butanol, and xylene mixed in a weight ratio of 2:2:1:1; The protective layer mixture includes, by mass, 120 parts of varnish, 40 parts of elastomer, and 85 parts of diluent; the varnish is polyurethane acrylate, the elastomer is a blend of PP as a hard segment and EPDM as a soft segment, and the diluent is a mixture of butyl acetate, n-butanol, isobutanol, and xylene in a ratio of 2:2:1:1.

[0051] Example 3 This embodiment provides a method for preparing a wear-resistant and anti-fragmentation paint layer on the surface of an active alloy part, the steps comprising: (1) Compressed nitrogen and abrasive are mixed in a pressure tank to obtain high-pressure abrasive, and then the high-pressure abrasive is pressed into a sand delivery pipe through a sand outlet valve, and the high-pressure abrasive is sprayed onto the surface of an aluminum-zinc alloy workpiece through a nozzle under a nitrogen atmosphere, and the roughness of the surface of the aluminum-zinc alloy workpiece is made to be 3 μm; wherein the spraying parameters include: pressure of 0.7 MPa, angle of 70°, distance of 200 mm, and time of 8 s; (2) placing the active alloy part obtained in step (1) into a dewaxed water solution and heating it to 95°C and then subjecting it to ultrasonic treatment for 3 minutes, then successively subjecting the surface of the active alloy part to 360° vibration washing for 4 minutes with deionized water, soaking it in 90°C deionized water for 5 minutes, and drying it in a vacuum box at 100°C and -0.04MPa for 15 minutes; wherein the dewaxed water solution is a mixture of deionized water and dewaxed water in a mass ratio of 30:1; and the frequency of the ultrasonic treatment is 100 kHz; (3) using a reciprocating sprayer to spray the bonding layer mixture onto the surface of the active alloy part obtained in step (2), and heating the mixture from room temperature to 90°C at a heating rate of 2°C / min, then keeping the temperature for 5 min, and then heating the mixture to 180°C at a heating rate of 5°C / min, then keeping the temperature for 5 min, and naturally cooling the mixture to obtain a bonding layer with a thickness of 20 μm; (4) Spray the multi-color layer mixture onto the surface of the bonding layer using a reciprocating sprayer and heat the mixture from room temperature to 90°C at a heating rate of 2°C / min and then keep the temperature for 5 min. Then heat the mixture to 180°C at a heating rate of 5°C / min and keep the temperature for 5 min. After natural cooling, a multi-color layer with a thickness of 20 μm is obtained. (5) The protective layer mixture is sprayed on the surface of the multi-color layer by a reciprocating sprayer and the temperature is raised from room temperature to 90°C at a heating rate of 2°C / min and then kept at this temperature for 5 minutes. The temperature is then raised to 170°C at a heating rate of 5°C / min and then kept at this temperature for 5 minutes. After natural cooling, a multi-color layer with a thickness of 20 μm is obtained. The bonding layer mixture includes 115 parts of transparent coating, 14 parts of hardener, and 88 parts of diluent. The transparent coating is epoxy resin, the hardener is polyetheramine resin, and the diluent is ethyl acetate, dibasic ester DBE, n-butanol, and diethylene glycol monobutyl ether in a ratio of 3:2:1:1. The multi-color layer mixed liquid includes, by weight, 40 parts of transparent coating, 68 parts of colorant, 15 parts of curing agent, and 107 parts of diluent; the transparent coating is polyurethane resin, the curing agent is polyurethane curing agent, the colorant is MESOPU® color paste series red colorant of BOMEX Chemical, and the diluent is ethyl acetate, butyl acetate, n-butanol, and xylene mixed in a weight ratio of 2:2:1:1; The protective layer mixture includes, by mass, 127 parts of varnish, 43 parts of elastomer, and 89 parts of diluent; the varnish is polyurethane acrylate, the elastomer is a blend of PP as a hard segment and EPDM as a soft segment, and the diluent is a mixture of butyl acetate, n-butanol, isobutanol, and xylene in a ratio of 2:2:1:1.

[0052] Comparative Example 1 Comparative Example 1 is substantially the same as Example 1, the only difference between the two being that Comparative Example 1 uses compressed air instead of the compressed nitrogen in Example 1; and Comparative Example 1 uses natural environmental conditions instead of the nitrogen atmosphere in Example 1.

[0053] Comparative Example 2 Comparative Example 2 is substantially the same as Example 1, the only difference between the two being that anhydrous ethanol is used in Comparative Example 2 instead of the potassium permanganate aqueous solution in Example 1.

[0054] Comparative Example 3 Comparative Example 3 is substantially the same as Example 1, the only difference between the two being that ethyl acetate is used in Comparative Example 3 instead of the potassium permanganate aqueous solution in Example 1.

[0055] Comparative Example 4 Comparative Example 4 is basically the same as Example 2, and the only difference between the two is the different heating methods in step (3). Specifically, step (3) of Comparative Example 4 is to directly place the active alloy part sprayed with the bonding layer mixture in an 80°C environment for 41 minutes, and then transfer it to a 170°C environment for 25 minutes.

[0056] Comparative Example 5 Comparative Example 5 is basically the same as Example 2, and the only difference between the two is the different heating method in step (4). Specifically, step (4) of Comparative Example 5 is to directly place the active alloy part sprayed with the multi-color layer mixture in an 80°C environment for 41 minutes, and then transfer it to a 170°C environment for 25 minutes.

[0057] Comparative Example 6 Comparative Example 6 is basically the same as Example 2, and the only difference between the two is the different heating methods in step (5). Specifically, step (5) of Comparative Example 6 is to directly place the active alloy part sprayed with the protective layer mixture in an 80°C environment for 41 minutes, and then transfer it to a 160°C environment for 23 minutes.

[0058] Comparative Example 7 Comparative Example 7 is basically the same as Example 2, and the only difference between the two is the different heating methods in step (3), step (4) and step (5); specifically, step (3) of Comparative Example 7 is to directly place the active alloy part sprayed with the bonding layer mixture in an 80°C environment for 41 minutes, and then transfer it to a 170°C environment for 25 minutes; step (4) is to directly place the active alloy part sprayed with the multi-color layer mixture in an 80°C environment for 41 minutes, and then transfer it to a 170°C environment for 25 minutes; step (5) is to directly place the active alloy part sprayed with the protective layer mixture in an 80°C environment for 41 minutes, and then transfer it to a 160°C environment for 23 minutes.

[0059] Comparative Example 8 Comparative Example 8 is substantially the same as Example 2, and the only difference between the two is that the elastifier is removed from the protective layer mixed liquid in Comparative Example 8.

[0060] The surfaces of the active alloy parts obtained in Example 2 and Comparative Example 7 were microscopically inspected using a digital microscope. The inspection results are as follows: Figure 1 and Figure 2 As shown. Figure 2 It can be seen that the active alloy piece obtained in Comparative Example 7 has many bubbles on its surface.

[0061] According to the following test methods, the paint layer on the surface of the active alloy parts obtained in Examples 1 to 3 and Comparative Examples 1 to 8 was subjected to wear resistance test and drop test, respectively. The test results are shown in Table 1. Figure 1 to Figure 7 The effect diagrams of the active alloy parts obtained in Example 2, Example 3, Comparative Example 4, Comparative Example 5 and Comparative Example 7 after the wear resistance test are shown; Figure 8~Figure 17 The effect diagrams of the active alloy parts obtained in Example 1, Comparative Example 1, Comparative Example 2, Comparative Example 3, Example 2, Example 3, Comparative Example 4, Comparative Example 5, Comparative Example 7 and Comparative Example 8 after the drop test are shown.

[0062] Wear test: 1. Put 2.5KG grinding stone, 50ml grinding liquid and active alloy parts into a container, then add 500ml deionized water.

[0063] 2. Close the container lid tightly, place the container in the mixing device of the three-dimensional roller mill, and secure it with a rubber strip. 3. Adjust the speed of the 3D machine to 72 rpm, close the instrument cover, and start the instrument; 4. Set the rolling time to 3 minutes, turn off the machine, take out the test workpiece in the container, wash it with tap water, and then dry it with natural wind or in a vacuum oven.

[0064] Test result judgment: the sample is qualified if there is no obvious scratch on the surface, and unqualified if there are slight scratches, obvious scratches or falling off.

[0065] Drop test steps: Test equipment: drop test box.

[0066] Before testing, ensure that the sample is intact and has no assembly defects and the drop box door is closed. During the test, loosen the sample from the top of the 2M high drop box and drop it into the box. Repeat 3 times. Observe and record the changes of the sample after the drop. Test results: samples without film collapse or shedding are qualified, while samples with slight or obvious shedding are unqualified.

[0067] Table 1

[0068] Comparing Example 1 with Comparative Example 1, the preparation method of Example 1 can produce a paint layer with better wear resistance and chipping resistance on the surface of the active alloy part, which indicates that the use of compressed inert gas instead of traditional air as the sandblasting power and the sandblasting operation in an inert atmosphere can effectively avoid oxidation reaction on the surface of the active metal alloy part during the sandblasting process, improve the bonding strength between the bonding layer and the active alloy part, reduce the problem of bonding layer falling off due to oxidation, thereby significantly improving the wear resistance and chipping resistance.

[0069] By comparing Example 1 with Comparative Examples 2-3, it can be seen that the preparation method of Example 1 can produce a paint layer with better wear resistance and anti-cracking performance on the surface of the active alloy part, which indicates that compared with the use of traditional solvents (such as ethanol or ethyl acetate), the use of dewaxed water or potassium permanganate aqueous solution as a cleaning agent combined with ultrasonic treatment can effectively remove burrs, residual wax or other impurities on the surface of the active alloy part; at the same time, the dewaxed water or potassium permanganate aqueous solution has low chemical corrosion to the surface of the active alloy part, which improves the bonding strength between the bonding layer and the active alloy part, reduces the risk of bonding layer falling off due to corrosion, and thus significantly improves the wear resistance and anti-cracking performance.

[0070] By comparing Example 2 with Comparative Examples 4 to 7, it can be seen that the preparation method of Example 2 can prepare a paint layer with better wear resistance and anti-cracking performance on the surface of the active alloy part. This shows that the bonding layer mixture, the multi-color layer mixture and the protective layer mixture are sprayed on the surface of the active alloy part in sequence. After each layer is sprayed, a step-by-step programmed temperature rise method is used to promote the solidification of each layer of the mixture. The step-by-step programmed temperature rise controls the temperature to gradually increase, so that each layer slowly dries and forms a film under low temperature conditions, and the organic solvent can evaporate smoothly and fully. This can avoid the local solvent from escaping due to the excessively fast film-forming chemical reaction, and is locked in the film-formed paint layer, thereby preventing the generation of many tiny bubbles in the subsequent high-temperature treatment process, and ultimately greatly improving the bonding strength between the bonding layer and the active alloy part, the bonding strength between the bonding layer and the multi-color layer, and the bonding strength between the multi-color layer and the protective layer, effectively avoiding the paint layer from falling off after being impacted by external force, so that the paint layer on the surface of the active alloy part has excellent wear resistance and anti-cracking performance.

[0071] By comparing Example 2 with Comparative Example 8, it can be seen that the preparation method of Example 2 can prepare a paint layer with better wear resistance and anti-cracking performance on the surface of the active alloy part. This shows that when an elastifier is introduced into the protective layer mixture, when the protective layer on the surface of the active alloy part falls or collides in daily life, the elastifier can absorb part of the impact energy and play a buffering role. The impact resistance is enhanced, thereby effectively preventing the protective layer from being damaged due to falling or other physical impacts, thereby reducing the risk of exposure or damage to the underlying multi-color layer due to damage to the protective layer. Therefore, introducing an elastifier into the protective layer mixture can further improve the wear resistance and anti-peeling and film collapse performance of the paint layer.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention is described in detail with reference to the preferred embodiments, it is not limited to those listed in the embodiments. Those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A method for preparing a wear-resistant and anti-friction paint layer on the surface of an active alloy part, characterized in that the steps include: (1) mixing compressed inert gas and abrasive to obtain high-pressure abrasive, and then spraying the high-pressure abrasive onto the surface of the active alloy part in an inert atmosphere; (2) placing the active alloy part obtained in step (1) into a dewaxing aqueous solution or a potassium permanganate aqueous solution and subjecting it to ultrasonic treatment, and then sequentially subjecting it to washing and vacuum drying treatment; (3) spraying the bonding layer mixture onto the surface of the active alloy part obtained in step (2) and curing it by a first stepwise programmed temperature rise to form a bonding layer; (4) spraying the multi-color layer mixture onto the surface of the bonding layer and curing it by a second segmented temperature program to form a multi-color layer; (5) spraying the protective layer mixture onto the surface of the multi-color layer and curing it by a third segmented temperature program to form a protective layer; The protective layer mixed liquid includes an elasticizing agent.

2. The method for preparing the wear-resistant and anti-friction paint layer on the surface of an active alloy part according to claim 1, characterized in that: Step (1) comprises mixing compressed nitrogen or compressed argon with abrasive to obtain high-pressure abrasive, and then spraying the high-pressure abrasive onto the surface of the active alloy part in a nitrogen or carbon dioxide atmosphere to make the surface roughness of the active alloy part be 0.1-3.0 μm.

3. The method for preparing the wear-resistant and anti-friction paint layer on the surface of an active alloy part according to claim 1, characterized in that: The cleaning in step (2) includes 360° vibration washing with water and soaking in hot water at 75-90°C.

4. The method for preparing the wear-resistant and anti-friction paint layer on the surface of an active alloy part according to claim 1, characterized in that: The parameters of the first staged programmed temperature rise and the second staged programmed temperature rise are independent of each other: heating from room temperature to 70-90°C at a heating rate of 1-2°C / min and then keeping warm for 5-10 minutes, and then heating to 160-180°C at a heating rate of 4-5°C / min and then keeping warm for 5-10 minutes.

5. The method for preparing the wear-resistant and anti-friction paint layer on the surface of an active alloy part according to claim 1, characterized in that: The parameters of the third staged programmed temperature increase are: heating from room temperature to 70-90°C at a heating rate of 1-2°C / min, then keeping warm for 5-10 minutes, and then heating to 150-170°C at a heating rate of 4-5°C / min, then keeping warm for 5-10 minutes.

6. The method for preparing the wear-resistant and anti-friction paint layer on the surface of an active alloy part according to claim 1, characterized in that: The elasticizer is a styrene-butadiene-styrene block copolymer, a styrene-isoprene-styrene block copolymer or a blend of PP as a hard segment and EPDM as a soft segment.

7. The method for preparing the wear-resistant and anti-friction paint layer on the surface of an active alloy part according to claim 1, characterized in that: The thickness of the bonding layer is 10-20 μm; the thickness of the multi-color layer and the protective layer are independently 15-20 μm.

8. The method for preparing the wear-resistant and anti-friction paint layer on the surface of an active alloy part according to claim 1, characterized in that: The bonding layer mixture comprises, by weight: 100-120 parts of transparent coating, 10-15 parts of hardener, and 80-90 parts of diluent; the transparent coating is epoxy resin or polyurethane resin, and the hardener is polyetheramine resin or polyurethane resin.

9. The method for preparing the wear-resistant and anti-friction paint layer on the surface of an active alloy part according to claim 1, characterized in that: The multi-color layer mixed liquid comprises, by mass, 30 to 40 parts of transparent coating, 50 to 70 parts of colorant, 10 to 15 parts of curing agent, and 90 to 110 parts of diluent; the transparent coating is epoxy resin or polyurethane resin, and the curing agent is polyetheramine resin or polyurethane resin.

10. The method for preparing the wear-resistant and anti-friction paint layer on the surface of an active alloy part according to claim 1, characterized in that: The protective layer mixture comprises, by weight: 100-130 parts of varnish, 25-45 parts of the elastifier, and 80-90 parts of a diluent; the varnish is acrylic resin or polyurethane acrylate, and the diluent is selected from at least one of butyl acetate, n-butanol, isobutanol, and xylene.

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