Micro-arc oxidation reaction device

Abstract

The invention relates to a micro-arc oxidation reaction device. The micro-arc oxidation reaction device comprises a power supply; the electrolytic bath is used for placing a to-be-oxidized part, and the power supply is used for being electrically conducted with the electrolytic bath and the to-be-oxidized part; the adding mechanism comprises a containing groove, the containing groove is used for containing an additive, when the number of the electrolytic cells is one, the containing groove is communicated with the electrolytic cell, when the number of the electrolytic cells is multiple, the containing groove is communicated with one of the electrolytic cells, the containing groove is used for releasing the additive into the electrolytic cells, the containing groove is provided with an outlet, and the outlet is provided with an electromagnetic valve and a flow meter; the electromagnetic valve is used for controlling the opening of the outlet; the control mechanism is electrically connected with the electromagnetic valve and the flow meter, and the control mechanism is used for controlling the opening degree of the electromagnetic valve. According to the micro-arc oxidation reaction device, the concentration of the specific oxide in the first electrolytic cell is gradually increased, so that the concentration of the specific oxide in the finally formed oxide layer is in a gradient increasing trend.

Description

Technical Field

[0001] The present application relates to the field of micro-arc oxidation reaction, and in particular to a micro-arc oxidation reaction device. Background Art

[0002] The application of new low-density lightweight materials is an important way to achieve lightweight spacecraft platforms and equipment, and can significantly reduce the weight of spacecraft platform structures / mechanisms and load structures / mechanisms. Lightweight alloys are currently one of the lightest metal structural materials, and the engineering application of this material has broad application prospects for the lightweighting of spacecraft. However, lightweight alloys have low hardness, poor wear resistance and corrosion resistance, and lack thermal control performance. The thermal control and anti-corrosion functional coating technology on their surface has become a bottleneck for their widespread application in spacecraft. Among the above-mentioned problems, poor corrosion resistance, thermal control and wear resistance are the main factors restricting the practical application of lightweight alloys. Therefore, it is urgent to develop advanced magnesium alloy surface anti-corrosion and wear-resistant technologies to improve their corrosion resistance and wear resistance to meet their application needs in spacecraft platforms and equipment.

[0003] Micro-arc oxidation technology is a surface treatment technology for light alloy materials developed in recent years based on traditional anodizing. It forms a ceramic oxide layer on the metal surface to improve the metal's corrosion resistance, wear resistance, heat resistance and other properties. It breaks through the limitation of the working voltage of traditional anodizing technology, introduces the working area into the high-voltage discharge area, and uses the instantaneous high-temperature sintering effect of the micro-arc area to directly grow ceramic films in situ on the surface of valve metals such as Al, Mg, and Ti. The ceramic film has a dense structure, is firmly bonded to the substrate, is wear-resistant, heat-resistant, has excellent electrical insulation properties, and is basically pollution-free to the environment. Conventional micro-arc oxidation methods have problems such as low film bonding strength and poor uniformity. It is necessary to develop a continuous multi-layer gradient low-absorption micro-arc oxidation preparation device for light alloys suitable for aerospace, aviation and other products. Summary of the invention

[0004] The present application provides a micro-arc oxidation reaction device to solve the problems of low film bonding strength and poor uniformity.

[0005] The micro-arc oxidation reaction device according to the present application includes: a power supply;

[0006] At least one electrolytic cell, the electrolytic cell is used to place the workpiece to be oxidized, and the power supply is used to electrically connect the electrolytic cell and the workpiece to be oxidized;

[0007] An adding mechanism, the adding mechanism comprising a containing tank, the containing tank being used to contain additives, when there is one electrolytic cell, the containing tank is in conduction with the electrolytic cell, when there are multiple electrolytic cells, the containing tank is in conduction with one of the electrolytic cells, the containing tank is used to release the additives into the electrolytic cell, the containing tank is provided with an outlet, a flow meter is provided in the containing tank, an electromagnetic valve is provided at the outlet, and the electromagnetic valve is used to control the opening of the outlet;

[0008] A control mechanism, wherein the control mechanism is electrically connected to the solenoid valve and the flow meter, and the control mechanism is used to control the opening of the solenoid valve.

[0009] According to the micro-arc oxidation reaction device of the present application, the containing tank is arranged above the electrolytic cell, and the outlet is directly opposite to the opening of the electrolytic cell.

[0010] According to the micro-arc oxidation reaction device of the present application, it is characterized in that a crushing mechanism is provided in the containing tank, and the crushing mechanism is used to refine the particles of the additive.

[0011] According to the micro-arc oxidation reaction device of the present application, a fish pump is also provided in the electrolytic cell.

[0012] According to the micro-arc oxidation reaction device of the present application, an air jet pipe is further provided in the electrolytic cell, the air jet pipe is connected to an air compressor, and at least one air jet hole is provided on the air jet pipe.

[0013] Optionally, the gas injection pipe is arranged along the width direction or the length direction of the electrolytic cell, and a plurality of gas injection holes are provided on the gas injection pipe, and the plurality of gas injection holes are evenly spaced along the length direction of the gas injection pipe.

[0014] Optionally, the micro-arc oxidation reaction device also includes a cooling mechanism, which includes a first heat exchanger and a second heat exchanger, the first heat exchanger is arranged in the electrolytic cell, the first heat exchanger and the second heat exchanger are connected to each other to form a circulation loop, and a first pump body is arranged in the circulation loop.

[0015] Optionally, the first heat exchanger is arranged below the injection pipe.

[0016] According to the micro-arc oxidation reaction device of the present application, at least the electrolytic cell connected to the containing tank is also connected to a circulation mechanism, and the circulation mechanism includes a circulation pipeline, the inlet and outlet of the circulation pipeline are both connected to the electrolytic cell, and a second pump body and a filter assembly are arranged on the circulation pipeline.

[0017] According to the micro-arc oxidation reaction device of the present application, when there are multiple electrolytic cells, the part to be oxidized is first oxidized in the remaining electrolytic cells in sequence, and then finally placed in the electrolytic cell connected to the containing tank for oxidation.

[0018] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0019] In the micro-arc oxidation reaction device provided in the embodiment of the present application, the micro-arc oxidation reaction is carried out in an electrolytic cell, the electrolytic cell is used to fill the micro-arc oxidation solution, the workpiece to be oxidized (metal workpiece) is placed in the micro-arc oxidation solution and electrically connected to the power supply, the ions in the micro-arc oxidation solution migrate under the action of the electric field to form a micro-arc discharge area, the local electric field intensity in this area is extremely high, and high temperature is generated, which promotes the metal surface to react with the oxide in the micro-arc oxidation solution to form a ceramic oxide layer. In the process of micro-arc oxidation, additives such as salts and acids can enhance the performance of the oxide film, such as improving the density, hardness, corrosion resistance, etc. of the film. The additives are added through the containing tank and controlled by the solenoid valve and the flow meter. During the oxidation of the workpiece to be oxidized, the opening of the outlet can be controlled by the solenoid valve, and the solenoid valve can be controlled by the real-time feedback of the flow meter, so that the additives released from the outlet reach the preset flow rate, so that the concentration of specific oxides in the electrolytic cell gradually increases with the oxidation of the workpiece to be oxidized, so that the concentration of specific oxides in the oxide layer finally formed presents a gradient rising trend, so that the film layer can gradually obtain the desired performance improvement during the formation process. For example, some additives can improve the density of the film layer, and gradually increasing the concentration of additives can improve the density of the film layer, reduce the porosity, and then enhance the corrosion resistance of the film layer, thereby improving the film layer. At the same time, by gradually increasing the concentration of additives, the reaction activity in the micro-arc oxidation process can be controlled. The gradual increase in concentration can make the reaction more controllable and avoid excessive reaction activity leading to unstable film structure. Of course, by controlling the concentration of additives, the uniformity of the film can be better controlled. The gradual increase in concentration helps to reduce the thickness difference of the film, improve the overall uniformity of the film, and reduce defects in the film forming process, such as cracks and pinholes. In addition, different metal materials or different application environments may require films of different properties. By gradually increasing the concentration of additives during the micro-arc oxidation process, the characteristics of the film can be adjusted according to specific needs, thereby improving the adaptability and performance of the material. In addition, by precisely controlling the concentration of additives, the reaction conditions can be optimized, waste in the production process can be reduced, and production efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0023] Figure 1 A schematic diagram of a micro-arc oxidation device provided in an embodiment of the present application;

[0024] Figure 2 A partial structural schematic diagram of a micro-arc oxidation device provided in an embodiment of the present application.

[0025] Description of reference numerals:

[0026] Power supply 10, electrolytic cell 20, cathode plate 201, anode pole 202, fish pump 21, jet pipe 22, adding mechanism 30, containing tank 31, solenoid valve 32, flow meter 33, crushing mechanism 34, control mechanism 40, air compressor 50, cooling mechanism 60, first heat exchanger 61, second heat exchanger 62, first pump body 63, circulation mechanism 70, second pump body 71, filter assembly 72, switch valve 73, connecting pipe 74, electrolyte 80, thermometer 90, part to be oxidized 2, additive 3. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0028] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0029] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0030] like Figure 1 and Figure 2 As shown, the micro-arc oxidation reaction device according to an embodiment of the present application includes a power supply 10, at least one electrolytic cell 20, an adding mechanism 30 and a control mechanism 40.

[0031] Specifically, the electrolytic cell 20 is used to place the workpiece 2 to be oxidized, and the power supply 10 is used to be electrically connected to the electrolytic cell 20 and the workpiece 2 to be oxidized; the adding mechanism 30 includes a receiving tank 31, and the receiving tank 31 is used to receive the additive 3. When there is one electrolytic cell 20, the receiving tank 31 is connected to the electrolytic cell 20; when there are multiple electrolytic cells 20, the receiving tank 31 is connected to one of the multiple electrolytic cells 20, and the receiving tank 31 is used to release the additive 3 into the electrolytic cell 20. The receiving tank 31 is provided with an outlet, and a flow meter 33 is provided in the receiving tank 31. An electromagnetic valve 32 is provided at the outlet, and the electromagnetic valve 32 is used to control the opening of the outlet; the control mechanism 40 is electrically connected to the electromagnetic valve 32 and the flow meter 33, and the control mechanism 40 is used to control the opening of the electromagnetic valve 32.

[0032] In the above-mentioned embodiment, the electrolytic cell 20 is used to place the workpiece 2 to be oxidized, and is usually set to have enough space to accommodate one or more workpieces 2 to be oxidized. The inside of the electrolytic cell 20 should maintain good insulation performance to ensure the stable progress of the electrolysis process. The material of the electrolytic cell 20 should be corrosion-resistant to avoid reaction with the electrolyte in the oxidation process. For example, in a specific embodiment, Teflon is used inside the electrolytic cell 20. In a specific embodiment, a cathode plate 201 and an anode pole bar 202 are provided in the electrolytic cell 20, and the cathode plate 201 and the anode pole bar 202 are both electrically connected to the power supply 10, wherein the anode pole bar 202 is used to be electrically connected to the workpiece 2 to be oxidized. The power supply 10 can be electrically connected to the control mechanism 40, or it can be controlled separately. When the power supply 10 is electrically connected to the control mechanism 40, the power supply 10 can be turned on and off by the control mechanism 40.

[0033] The containing tank 31 is used to store the additive 3. The containing tank 31 is connected to the electrolytic tank 20 to release the additive 3 into the electrolytic tank 20. The outlet can be set on the side wall or bottom wall of the containing tank 31. The outlet and the electrolytic tank 20 can be connected through a pipeline or directly opposite. The additive 3 in the containing tank 31 can be in a solution state.

[0034] The solenoid valve 32 is used to control the release amount of the additive 3 to achieve precise control, and the flow meter 33 can be used to monitor the release rate of the additive 3 to ensure the stability of the process parameters. The flow meter 33 can be set at the outlet, and can also be set inside the containing tank 31 to monitor the total amount or remaining amount of the additive 3.

[0035] In detail, the micro-arc oxidation reaction is carried out in the electrolytic cell 20, which is used to fill the micro-arc oxidation solution. The part to be oxidized 2 (metal part) is placed in the micro-arc oxidation solution and electrically connected to the power supply 10. The ions in the micro-arc oxidation solution migrate under the action of the electric field to form a micro-arc discharge area. The local electric field intensity in this area is extremely high, generating high temperature, which promotes the metal surface to react with the oxide in the micro-arc oxidation solution to form a ceramic oxide layer. During the micro-arc oxidation process, additives 3 such as salts, acids, etc. can enhance the performance of the oxide film, such as improving the density, hardness, corrosion resistance, etc. of the film. The additives 3 are added to the electrolytic cell 20 through the receiving tank 31 and controlled by the solenoid valve 32 and the flow meter 33. During the oxidation of the part to be oxidized 2, the opening of the outlet can be controlled by the solenoid valve 32, and the solenoid valve 32 can be controlled by the real-time feedback of the flow meter 33, so that the additive 3 released from the outlet reaches a preset flow rate, so that the concentration of the specific oxide in the first electrolytic cell gradually increases with the oxidation of the part to be oxidized 2, so that the concentration of the specific oxide in the finally formed oxide layer shows a gradient rising trend.

[0036] For example, in a specific embodiment, there are three electrolytic cells 20, which are defined as a first electrolytic cell, a second electrolytic cell, and a third electrolytic cell, respectively, and the first electrolytic cell is connected to the containing cell 31. When there are multiple electrolytic cells 20, the workpiece 2 to be oxidized can be oxidized in different electrolytic cells 20, and the additive 3 can be gradually added only in the first electrolytic cell.

[0037] According to the micro-arc oxidation reaction device of the embodiment of the present application, the concentration of specific oxides in the electrolytic cell 20 can gradually increase with the oxidation of the part to be oxidized 2, so that the concentration of specific oxides in the oxide layer finally formed can show a gradient upward trend, so that the film layer gradually obtains the desired performance improvement during the formation process. For example, certain additives 3 can improve the density of the film layer. Gradually increasing the concentration of additives 3 can improve the density of the film layer, reduce the porosity, and further enhance the corrosion resistance of the film layer, thereby improving the bonding strength of the film layer and improving the uniformity of the coating. At the same time, by gradually increasing the concentration of additives 3, the reaction activity during the micro-arc oxidation process can be controlled. The gradual increase in concentration can make the reaction more controllable and avoid excessive reaction activity leading to unstable film structure.

[0038] Of course, by controlling the concentration of additive 3, the uniformity of the film layer can also be better controlled. The gradual increase in concentration helps to reduce the thickness difference of the film layer, improve the overall uniformity of the film layer, and reduce defects in the film layer forming process, such as cracks and pinholes. In addition, different metal materials or different application environments may require films of different properties. By gradually increasing the concentration of additive 3 during the micro-arc oxidation process, the characteristics of the film layer can be adjusted according to specific needs, and the adaptability and performance of the material can be improved; in addition, by accurately controlling the concentration of additive 3, the reaction conditions can be optimized, the waste in the production process can be reduced, and the production efficiency can be improved.

[0039] According to the micro-arc oxidation reaction device of the embodiment of the present application, the containing tank 31 is arranged above the electrolytic cell 20, and the outlet is directly opposite to the opening of the electrolytic cell 20. In this way, the additive 3 is conveniently introduced into the electrolytic cell 20 directly and quickly, so that the additive 3 is more evenly distributed in the micro-arc oxidation solution, and the efficiency and quality of the micro-arc oxidation are improved. At the same time, such a configuration makes it easier to clean and inspect the containing tank 31 and the outlet to ensure the purity of the additive 3 and the normal operation of the equipment.

[0040] like Figure 2 As shown, in some embodiments, a thermometer 90 is provided in the electrolytic cell 20 , and the thermometer 90 is electrically connected to the control mechanism 40 , so as to facilitate controlling the temperature of the electrolyte 80 in the electrolytic cell 20 .

[0041] like Figure 2As shown, according to the micro-arc oxidation reaction device of the embodiment of the present application, a crushing mechanism 34 is provided in the containing tank 31 , and the crushing mechanism 34 is used to refine the particles of the additive 3 .

[0042] Specifically, refining the particles of additive 3 can increase the contact area between the particles of additive 3 and the surface of the workpiece 2 to be oxidized, thereby improving the efficiency and quality of the micro-arc oxidation reaction. Smaller particles can be more evenly distributed in the micro-arc oxidation solution, thereby promoting the effective release and reaction of additive 3. At the same time, the refinement of the particles of additive 3 helps the additive 3 to be better dissolved in the micro-arc oxidation solution, reduce precipitation and agglomeration, ensure the uniform distribution of additive 3 in the micro-arc oxidation solution, and improve the stability and controllability of the entire micro-arc oxidation process. The refined particles of additive 3 can promote the formation of a more uniform oxide layer, thereby improving the surface quality and performance of the final product.

[0043] The crushing mechanism 34 may be based on the principle of mechanical crushing, ultrasonic crushing, air flow crushing, and liquid flow crushing. When the crushing mechanism uses the principle of mechanical crushing, an agitator is provided in the receiving tank 31; when the crushing mechanism uses the principle of ultrasonic crushing, an ultrasonic generator is provided in the receiving tank 31, and the additive 3 is crushed by the high-frequency vibration of ultrasonic waves. Ultrasonic crushing can be performed without contacting the additive 3, thus avoiding impurities or damage that may be introduced by mechanical crushing. When the crushing mechanism uses air flow to crush the additive 3, a nozzle is provided in the receiving tank 31, and the nozzle is used to spray air flow. The nozzle is connected to the air source, and an air flow control valve is provided on the pipeline connecting the nozzle and the air source. The air flow control valve is used to adjust the air flow speed and direction.

[0044] like Figure 2 As shown, according to the micro-arc oxidation reaction device of the embodiment of the present application, a fish pump 21 is also provided in the electrolytic cell 20. The fish pump 21 can promote the circulation of the micro-arc oxidation solution in the electrolytic cell 20, so that the additive 3 and the reactant can be more evenly distributed in the micro-arc oxidation solution, which helps to improve the efficiency and uniformity of the reaction, and at the same time can increase the contact area between the micro-arc oxidation solution and the part to be oxidized 2, thereby enhancing the reaction rate during the micro-arc oxidation process, and helping to generate a denser and more uniform oxide layer. During the electrolysis process, the additive 3 may form precipitation or agglomeration due to concentration differences, affecting the uniformity and efficiency of the reaction. The circulation of the fish pump 21 can reduce this phenomenon and maintain the uniform distribution of the additive 3. In addition, the circulation of the fish pump 21 can adjust the temperature of the micro-arc oxidation solution in the electrolytic cell 20 to avoid local overheating or overcooling of the micro-arc oxidation solution.

[0045] The fish pump 21 is usually arranged at the bottom of the electrolytic cell 20 , which can ensure more uniform circulation of the liquid and is also convenient for connection with the power source 10 .

[0046] like Figure 2 As shown, according to the micro-arc oxidation reaction device of the embodiment of the present application, an injection pipe 22 is further provided in the electrolytic cell 20, the injection pipe 22 is connected to the air compressor 50, and at least one injection hole is provided on the injection pipe 22.

[0047] In detail, the air compressor 50 provides pressurized gas for the jet pipe 22, which can effectively generate eddy currents in the electrolytic cell 20, stir the micro-arc oxidation solution, further promote the uniform distribution of the reactants, and improve the uniformity and quality of the oxide layer of the oxidized part 2. When the bubbles generated by the gas ejected from the jet hole rise in the micro-arc oxidation solution, they can interact with the gas generated by the oxidation reaction to form bubble clusters. These bubble clusters can accelerate the release of gas, thereby maintaining the dynamic balance of the micro-arc oxidation solution and promoting the reaction. In addition, during the micro-arc oxidation reaction, the temperature in the electrolytic cell 20 can be adjusted by controlling the jet amount and jet frequency. Too high a temperature may affect the stability of the reaction. By reasonably controlling the jet amount of the jet hole, the micro-arc oxidation solution can be maintained within a suitable temperature range, which is conducive to the stable progress of the oxidation process. In addition, by controlling the jet amount and jet frequency of the jet hole, the reaction rate of the micro-arc oxidation reaction can be controlled. After the gas ejected from the jet hole forms bubbles in the micro-arc oxidation solution, it can also mix with the gas in the micro-arc oxidation solution and accelerate its discharge during the rising process. It can be understood that the bubbles generated by the gas jet holes can promote the turbulence of the micro-arc oxidation solution, increase the contact area between the micro-arc oxidation solution and the oxide, and accelerate the transfer of reactants and the progress of the reaction.

[0048] like Figure 2 As shown, in some embodiments, the air jet pipe 22 is arranged along the width direction or the length direction of the electrolytic cell 20, and a plurality of air jet holes are provided on the air jet pipe 22, and the plurality of air jet holes are evenly spaced along the length direction of the air jet pipe 22.

[0049] In detail, the jet pipe 22 is arranged along the length or width direction of the electrolytic cell 20, which helps to evenly distribute the gas in the electrolytic cell 20. The uniform gas distribution can promote the circulation and stirring of the micro-arc oxidation solution, promote the uniformity of the micro-arc oxidation solution, and overcome the problem of easy sedimentation and uneven distribution of specific nano-oxide solutions in the electrolytic cell 20, thereby improving the uniformity of the oxide layer of the oxidized part 2 and avoiding local overheating or insufficient reaction.

[0050] It can be understood that a reasonable number of gas injection tubes 22 and gas injection holes can ensure the effective distribution of gas in the electrolytic cell 20. Too many or too few gas injection tubes 22 may cause uneven gas distribution. The shape and size of the gas injection holes will also affect the release characteristics of the gas. Generally, circular or elliptical holes can make the gas release more uniformly. Holes of specific shapes, such as rectangles or triangles, help to enhance gas flow in specific directions, thereby optimizing gas distribution and reaction efficiency. Therefore, they can be reasonably set as needed.

[0051] In summary, the gas injection pipe 22 is arranged along the width direction or the length direction of the electrolytic cell 20, which can ensure that the gas injected from the gas injection pipe 22 can cover a larger area, which helps to disturb the entire area.

[0052] The number of the air jet pipe 22 may be one, two or more. When there is one air jet pipe 22 , in some embodiments, the air jet pipe 22 extends along the width direction of the electrolytic cell 20 . In some embodiments, the air jet pipe 22 extends along the length direction of the electrolytic cell 20 .

[0053] When there are two jet pipes 22, in some embodiments, the two jet pipes 22 are arranged side by side and spaced along the length direction of the electrolytic cell 20; in some embodiments, the two jet pipes 22 are arranged side by side and spaced along the width direction of the electrolytic cell 20; in some embodiments, the two jet pipes 22 are arranged crosswise, one jet pipe 22 is arranged along the width direction of the electrolytic cell 20, and the other jet pipe 22 is arranged along the length direction of the electrolytic cell 20.

[0054] like Figure 1 and Figure 2 As shown, in some embodiments, the micro-arc oxidation device also includes a cooling mechanism 60, the cooling mechanism 60 includes a first heat exchanger 61 and a second heat exchanger 62, the first heat exchanger 61 is arranged in the electrolytic cell 20, the first heat exchanger 61 and the second heat exchanger 62 are connected to each other to form a circulation loop, and a first pump body 63 is arranged in the circulation loop.

[0055] Specifically, the first heat exchanger 61 is located inside the electrolytic cell 20, and absorbs the heat generated during the reaction by exchanging heat with the micro-arc oxidation solution in the electrolytic cell 20. A circulation loop is formed between the first heat exchanger 61 and the second heat exchanger 62 through a pipeline. The circulation loop is usually filled with a cooling medium (such as water, ethylene glycol and other coolants) and driven by a first pump body 63, so that the cooling medium circulates between the first heat exchanger 61 and the second heat exchanger 62. By controlling the flow rate, temperature and circulation speed of the cooling medium, the temperature of the first heat exchanger 61 (i.e., inside the electrolytic cell 20) can be effectively adjusted to maintain it within the appropriate range required for the reaction, thereby helping to avoid overheating and resulting in a decrease in the quality of the oxide layer of the oxidized component 2.

[0056] like Figure 2 As shown, in some embodiments, the first heat exchanger 61 is disposed below the injection pipe 22 .

[0057] It can be understood that since the jet pipe 22 needs to spray gas, if the first heat exchanger 61 is arranged above the jet pipe 22, it will affect the process of the airflow homogenizing the micro-arc oxidation solution. Therefore, the first heat exchanger 61 is arranged below the jet pipe 22 to avoid interfering with the process of the jet pipe 22 spraying the airflow. At the same time, it can also allow the first heat exchanger 61 to have a larger installation space, which is helpful to achieve uniform cooling of the entire area and optimize the temperature distribution in the electrolytic cell 20.

[0058] like Figure 2 As shown, according to the micro-arc oxidation reaction device of the embodiment of the present application, at least the electrolytic cell 20 connected to the containing tank 31 is also connected to a circulation mechanism 70. The circulation mechanism 70 includes a circulation pipeline, the inlet and outlet of the circulation pipeline are both connected to the first electrolytic cell, and a second pump body 71 and a filter assembly 72 are arranged on the circulation pipeline.

[0059] In detail, the first pump body 63 sucks the micro-arc oxidation solution out of the outlet of the electrolytic cell 20, and then transports it to the inlet of the electrolytic cell 20 through the circulation pipeline, forming a closed circulation flow. In this process, the filter component 72 filters the micro-arc oxidation solution to remove impurities and sediments therein. At the same time, the circulation mechanism 70 enables the micro-arc oxidation solution to cool down during the circulation process, effectively reducing the effect of heat generation during the micro-arc oxidation process on the temperature increase of the micro-arc oxidation solution, avoiding the temperature increase causing the film layer to dissolve. At the same time, the circulation mechanism 70 may include a temperature control component, so as to further adjust the temperature of the micro-arc oxidation solution during the circulation of the micro-arc oxidation solution to adapt to different reaction conditions and optimize the oxidation process, thereby avoiding the dissolution of the film layer due to high temperature generated by oxidation.

[0060] In summary, by setting up the circulation mechanism 70, the micro-arc oxidation solution is allowed to circulate in the electrolytic cell 20. During the circulation process, the micro-arc oxidation solution is filtered by the filter assembly 72 to remove the sediment and the agglomerates with higher particle size in the micro-arc oxidation solution to prevent them from affecting the reaction process and to prevent the agglomerates from settling into the film layer during the micro-arc oxidation process, thereby ensuring the quality of the film layer. Incidentally, the circulation of the micro-arc oxidation solution can ensure that the concentration of the micro-arc oxidation solution is evenly distributed in the electrolytic cell 20, overcome the problem that the specific nano-oxide solution is easy to settle and unevenly distributed, avoid excessive or low local concentration, thereby improving the uniformity and product quality of the oxidation process. Among them, the second pump body 71 provides power for the circulation of the micro-arc oxidation solution.

[0061] In some embodiments, when there are multiple electrolytic cells 20, a circulation mechanism 70 may be provided in each electrolytic cell 20, or the electrolytic cell 20 that is conductively connected to the containing tank 31 may be provided with a circulation mechanism 70, while the remaining electrolytic cells 20 may not be provided with a circulation mechanism 70. In other words, at least the electrolytic cell 20 that is conductively connected to the containing tank 31 must be provided with a circulation mechanism 70.

[0062] like Figure 2 As shown, in some embodiments, the circulation mechanism 70 includes a first branch and a second branch, a filter assembly 72 is provided on the first branch, and a connecting pipe 74 is provided on the second branch. The switch valve 73 is switched to control whether the electrolyte 80 is filtered. For example, when the switch valve 73 is switched to connect the first branch, the electrolyte 80 flows out of the electrolytic cell 20 and then flows back to the electrolytic cell 20 after being filtered by the filter assembly 72. When the switch valve 73 is switched to connect the second branch, the electrolyte 80 flows out of the electrolytic cell 20 and flows back to the electrolytic cell 20 through the connecting pipe 74, so that the electrolyte 80 performs heat dissipation circulation without filtering.

[0063] like Figure 2 As shown, in some embodiments, the electrolytic cell 20 is simultaneously provided with a corresponding cooling mechanism 60 and a circulation mechanism 70, and part of the pipelines of the circulation mechanism 70 are placed in the second heat exchanger 62. That is to say, after the electrolyte 80 is discharged from the electrolytic cell 20, it first enters the second heat exchanger 62 for heat exchange and then flows back to the electrolytic cell 20 via the first branch or the second branch. The second heat exchanger 62 includes a first heat exchange tube and a second heat exchange tube in parallel. The first heat exchange tube connects the electrolytic cell 20 and the circulation mechanism 70, and the second heat exchange tube forms a loop with the electrolytic cell 20.

[0064] According to the micro-arc oxidation reaction device of the embodiment of the present application, when there are multiple electrolytic cells 20, the oxidized component 2 is first oxidized in the remaining electrolytic cells 20 in sequence, and then finally placed in the first electrolytic cell for oxidation.

[0065] In detail, by sequentially oxidizing in multiple electrolytic cells 20, the oxide layer of the part to be oxidized 2 can be formed layer by layer to ensure the uniformity of the oxide layer of the part to be oxidized 2. Different electrolytic cells 20 can have different micro-arc oxidation solution formulas, temperatures, current density and other parameters, which help the part to be oxidized 2 to form a more uniform and denser oxide layer. For example, when some micro-arc oxidation solutions are corrosive, the oxide film layer will be dissolved, making it difficult to form a complete or thicker micro-arc oxidation film, or when the life of a certain micro-arc oxidation solution is reduced and the film-forming cost is high, other solutions can be used as primers to improve the quality of the micro-arc oxidation film layer. It can be understood that pre-oxidation under different conditions can promote the formation and development of the oxide layer. Through gradual optimization, an oxide layer with better quality and more stable performance can be obtained in the first electrolytic cell. In addition, by oxidizing in steps, it is easier to monitor and control the oxidation process at each stage, so that the parameters can be adjusted more accurately to ensure that the quality of the final product meets the requirements.

[0066] For example, when there are three electrolytic cells 20, the three electrolytic cells 20 are defined as a first electrolytic cell, a second electrolytic cell and a third electrolytic cell, and the oxidized component 2 is first oxidized in one of the second electrolytic cell and the third electrolytic cell, then oxidized in the other one, and finally placed in the first electrolytic cell for oxidation.

[0067] In some specific embodiments, there are multiple electrolytic cells 20 , and each electrolytic cell 20 is provided with a fish pump 21 , an air injection assembly, a cooling mechanism 60 and a circulation mechanism 70 .

[0068] like Figure 1 and Figure 2 As shown, in some specific embodiments, there are multiple electrolytic cells 20, each of which is provided with a fish pump 21, an injection assembly and a cooling mechanism 60, and a circulation mechanism 70 is further provided in the first electrolytic cell.

[0069] In some embodiments, the specific operation steps include:

[0070] Step 1: Prepare pretreatment solution, micro-arc oxidation solution and additive 3 solution.

[0071] Step 2: Turn on the fish pump 21, the jet assembly and the cooling mechanism 60 to stir the solution in the electrolytic cell 20 evenly and reduce the solution temperature to a temperature suitable for oxidation of 10°C-20°C.

[0072] Step 3: After pre-treatments such as alkaline washing and acid washing, the light alloy workpiece to be oxidized 2 is placed in the second electrolytic cell.

[0073] Step 4: Turn on the power supply 10 to oxidize the component 2 to be oxidized.

[0074] Step 5: Transfer the workpiece 2 to be oxidized to the third electrolytic tank.

[0075] Step 6: Turn on the micro-arc oxidation power supply 10 to oxidize the sample.

[0076] Step 7: Start the additive 3 system, add a specific low-absorption oxide mixture into the first electrolytic cell, and perform micro-arc oxidation while adding additive 3.

[0077] Step eight: Take out the part to be oxidized 2 from the first electrolytic cell and replace it with a new part to be oxidized 2.

[0078] In a specific embodiment, the solar absorption ratio of the micro-arc oxidation film layer of the oxidized component 2 is 0.22, the hemispherical emissivity is 0.88, and the film layer does not fall off after 100 times of high and low temperature thermal cycle tests at -196°C to 100°C.

[0079] In a specific embodiment, the solar absorption ratio of the micro-arc oxidation film layer of the oxidized component 2 is 0.23, the hemispherical emissivity is 0.88, and the film layer does not fall off after 100 times of high and low temperature thermal cycle tests at -196°C to 100°C.

[0080] In a specific embodiment, the solar absorption ratio of the oxidized component 2 is 0.23, the hemispherical emissivity is 0.89, and the film layer does not fall off after 100 times of high and low temperature thermal cycle tests at -196°C to 100°C.

[0081] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0082] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0083] The above is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A micro-arc oxidation reaction device, characterized in that: include: power supply; At least one electrolytic cell, the electrolytic cell is used to place the workpiece to be oxidized, and the power supply is used to electrically connect the electrolytic cell and the workpiece to be oxidized; An adding mechanism, the adding mechanism comprising a containing tank, the containing tank being used to contain additives, when there is one electrolytic cell, the containing tank is in conduction with the electrolytic cell, when there are multiple electrolytic cells, the containing tank is in conduction with one of the electrolytic cells, the containing tank is used to release the additives into the electrolytic cell, the containing tank is provided with an outlet, a flow meter is provided in the containing tank, an electromagnetic valve is provided at the outlet, and the electromagnetic valve is used to control the opening of the outlet; A control mechanism, wherein the control mechanism is electrically connected to the solenoid valve and the flow meter, and the control mechanism is used to control the opening of the solenoid valve.

2. The micro-arc oxidation reaction device according to claim 1, characterized in that: The containing tank is arranged above the electrolytic tank, and the outlet faces the opening of the electrolytic tank.

3. The micro-arc oxidation reaction device according to claim 1, characterized in that: A crushing mechanism is arranged in the containing tank, and the crushing mechanism is used to refine the particles of the additive.

4. The micro-arc oxidation reaction device according to claim 1, characterized in that: A fish pump is also provided in the electrolytic cell.

5. The micro-arc oxidation reaction device according to claim 1, characterized in that: An air jet pipe is also provided in the electrolytic cell, the air jet pipe is connected to an air compressor, and at least one air jet hole is provided on the air jet pipe.

6. The micro-arc oxidation reaction device according to claim 5, characterized in that: The gas injection pipe is arranged along the width direction or the length direction of the electrolytic cell, and a plurality of gas injection holes are arranged on the gas injection pipe, and the plurality of gas injection holes are evenly spaced along the length direction of the gas injection pipe.

7. The micro-arc oxidation reaction device according to claim 6, characterized in that: It also includes a cooling mechanism, which includes a first heat exchanger and a second heat exchanger. The first heat exchanger is arranged in the electrolytic cell. The first heat exchanger and the second heat exchanger are connected to each other to form a circulation loop. A first pump body is arranged in the circulation loop.

8. The micro-arc oxidation reaction device according to claim 7, characterized in that: The first heat exchanger is arranged below the air injection pipe.

9. The micro-arc oxidation reaction device according to claim 1, characterized in that: The electrolytic cell which is at least in communication with the containing tank is also connected to a circulation mechanism, wherein the circulation mechanism comprises a circulation pipeline, the inlet and the outlet of the circulation pipeline are both in communication with the electrolytic cell, and the circulation pipeline is provided with a second pump body and a filter assembly.

10. The micro-arc oxidation reaction device according to any one of claims 1 to 9, characterized in that: When there are multiple electrolytic cells, the part to be oxidized is first oxidized in the remaining electrolytic cells in sequence, and then finally placed in the electrolytic cell that is connected to the containing tank for oxidation.

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