A graphite electrode plate, an electrolytic phosphating process and its application

Abstract

The present application relates to the technical field of electrolytic phosphating, and particularly to a graphite electrode plate, an electrolytic phosphating process and application thereof. The present application discloses a graphite electrode plate, which comprises the following raw materials in percentage by weight: 10-20% of a binder, 1-5% of a conductive agent, 5-10% of carbon fibers, and the balance of graphite powder; the particle size of the graphite powder is 32-100 μm; the binder comprises one or more of phenolic resin, epoxy resin, furan resin or polytetrafluoroethylene resin; and the conductive agent comprises one or more of graphene, carbon black or carbon nanotubes. When the graphite electrode plate is applied to a phosphating process, graphite microparticles can be released from the surface of the graphite electrode plate, and the graphite microparticles are uniformly dispersed in the electrolyte. The graphite microparticles adsorbed on the phosphating film layer can significantly improve the lubricating performance of the film layer, reduce the friction coefficient, and reduce the drawing force, thereby improving the service performance and service life of the drawing die.

Description

Technical Field

[0001] This invention relates to the technical field of electrolytic phosphating, and in particular to a graphite electrode plate, an electrolytic phosphating process, and its applications. Background Technology

[0002] Electrolytic phosphating is a widely used technique for metal surface treatment. It forms a dense phosphating film on the metal surface, which effectively improves the metal's corrosion resistance and subsequent cold plastic processing performance. However, in traditional electrolytic phosphating processes, the lubrication performance of the phosphating film is often insufficient, limiting its use in certain specific applications, such as high-strength fasteners and moving mechanical parts. To improve the lubricity of the phosphating film, researchers have tried various methods, including improving the phosphating solution formulation, optimizing electrolytic process parameters, and adding post-lubrication processes. However, these methods often suffer from high costs and complex processes.

[0003] Therefore, this application provides a graphite electrode plate, an electrolytic phosphating process, and its application. Summary of the Invention

[0004] To address the issues of high cost and complex processes in current phosphating improvement methods, this application provides a graphite electrode plate, an electrolytic phosphating process, and its application. When the graphite electrode plate described in this application is used in the phosphating process, the surface of the graphite electrode plate can release graphite microparticles, which are uniformly dispersed in the electrolyte. The graphite microparticles adsorbed on the phosphating film can significantly improve the lubrication performance of the film, reduce the coefficient of friction, and reduce the drawing force, thereby improving the performance and lifespan of the drawing die.

[0005] The technical solution adopted by this application to solve its technical problem is:

[0006] In a first aspect, this application provides a graphite electrode plate comprising the following raw materials by weight percentage:

[0007] 10-20% binder, 1-5% conductive agent, 5-10% carbon fiber, and the balance is graphite powder;

[0008] The graphite powder has a particle size of 32-100 μm;

[0009] The adhesive includes one or more of phenolic resin, epoxy resin, furan resin or polytetrafluoroethylene resin;

[0010] The conductive agent includes one or more of graphene, carbon black, or carbon nanotubes.

[0011] The carbon fiber includes one or both of polyacrylonitrile-based carbon fiber and pitch-based carbon fiber.

[0012] In some specific embodiments, the method for preparing the graphite electrode plate includes the following steps:

[0013] S101. Add graphite powder and binder according to the raw material composition ratio of graphite electrode plates, heat and stir to mix evenly to form a mixture;

[0014] S102. Add the conductive agent and carbon fiber to the mixture, continue heating and stirring to obtain a homogeneous raw material;

[0015] S103. Place the mixed raw materials into a mold and press them into shape to obtain a shaped blank;

[0016] S104. Remove the molded blank from the mold and perform a curing process;

[0017] S105. After curing, slowly cool to room temperature to obtain the electrode blank;

[0018] S106. The electrode blank is subjected to sandblasting surface treatment to obtain graphite electrode.

[0019] In some specific embodiments, in step S106, the sandblasting surface treatment uses alumina as the abrasive, has an abrasive particle size of 120-180 mesh, a sandblasting pressure of 0.4-0.6 MPa, and a sandblasting time of 10-15 min.

[0020] In some specific embodiments, during electrolytic phosphating, the surface of the graphite electrode plate can release graphite microparticles, and the graphite microparticles are uniformly dispersed in the electrolyte.

[0021] Secondly, this application provides an electrolytic phosphating process, which uses the graphite electrode plate described in the first aspect as the anode to perform electrolytic phosphating.

[0022] In some specific embodiments, the electrolytic phosphating process includes the following steps:

[0023] S301. Install the graphite electrode plate in the electrolytic phosphating cell as the anode and connect it to the positive terminal of the electrolytic power supply;

[0024] S302. Pour the electrolytic phosphating solution into the electrolytic phosphating tank, heat, and stir;

[0025] S303. The raw material coiled wire is sequentially connected to the straightening machine, belt sander, voltage guide roller, water washing tank, electrolytic phosphating tank, post-water washing tank, and inverted take-up machine;

[0026] S304. Set the current density and wire speed, turn on the electrolytic phosphating power supply and invert the wire to perform electrolytic phosphating treatment on the raw wire.

[0027] In some specific embodiments, in step S302, the heating temperature is 40-60℃, and the stirring speed is maintained at 100-200 r / min.

[0028] In some specific embodiments, in step S304, the current density is 5-25 A / dm. 2 The routing speed was maintained at 0.6-1.6 m / s.

[0029] In some specific embodiments, each liter of electrolytic phosphating solution includes the following raw materials:

[0030] Phosphoric acid 130-150g, zinc oxide 75-90g, nitrate 80-120g, succinic acid 3-5g, citric acid 3-5g, polyphosphate 3-5g, polycarboxylate 3-5g, dodecylphenol polyoxyethylene ether 0.3-0.5g.

[0031] Thirdly, this application provides the application of the electrolytic phosphating process, which applies the electrolytic phosphating process described in the second aspect to the surface treatment of raw material wires.

[0032] The beneficial effects of this application are:

[0033] (1) The graphite electrode plate described in this application has a surface that easily releases microparticles. During the electrolytic phosphating process, the microparticles on the surface of the graphite electrode plate can gradually fall off and disperse into the electrolyte. The graphite electrode plate is inexpensive and its price is significantly lower than that of the precious metal anode plates such as iridium and ruthenium used in the current electrolytic phosphating process, thus having good cost-effectiveness.

[0034] (2) In the electrolytic phosphating process described in this application, the microparticles released from the surface of the graphite electrode plate during the electrolytic phosphating process can be uniformly dispersed in the electrolyte and eventually adsorbed on the phosphating film layer of the metal wire; the graphite microparticles adsorbed on the phosphating film layer can significantly improve the lubrication performance of the film layer, reduce the coefficient of friction, reduce the drawing force, thereby improving the performance and life of the drawing die, and has good cost-effectiveness.

[0035] (3) The electrolytic phosphating process described in this application improves the lubrication performance of the phosphating film and reduces the use of saponification liquid and drawing powder at the end of phosphating, which has good cost-effectiveness. Attached Figure Description

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0037] Figure 1 The test results are for the graphite electrode plate of this application;

[0038] Figure 2 Electrolytic phosphating solutions were prepared for Example 3 and Comparative Examples 1, 2, and 3;

[0039] Figure 3 Metallographic photograph of the electrolytic phosphating film obtained in Example 3;

[0040] Figure 4 Metallographic images of the electrolytic phosphating film were obtained for Comparative Example 4;

[0041] Figure 5 Metallographic images of the electrolytic phosphating film were obtained for Comparative Example 5;

[0042] Figure 6 Metallographic images of the electrolytic phosphating film were obtained for Comparative Example 6;

[0043] Figure 7 This is a graph showing the EDS analysis results of the electrolytic phosphating film obtained in Example 3;

[0044] Figure 8 The figure shows the EDS analysis results of the electrolytic phosphating film obtained in Comparative Example 4.

[0045] Figure 9 The results of the pull test are shown for the wires with phosphating film formed on the surface prepared in Examples 1-5 and Comparative Examples 1-5. Detailed Implementation

[0046] To make the technical problems, technical solutions, and beneficial effects of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0047] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0048] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, "at least one of a, b, or c", or "at least one of a, b, and c", can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple.

[0049] It should be understood that in the various embodiments of this application, the order of the above processes does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0050] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0051] The weights of the relevant components mentioned in the embodiments of this application can refer not only to the specific content of each component, but also to the proportional relationship between the weights of the components. Therefore, any scaling up or down of the content of the relevant components according to the embodiments of this application is within the scope disclosed in the embodiments of this application. Specifically, the mass described in the embodiments of this application can be a mass unit known in the chemical industry, such as μg, mg, g, or kg.

[0052] The terms "first" and "second" are used for descriptive purposes only, to distinguish objects, such as substances, from one another, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. For example, without departing from the scope of the embodiments of this application, "first XX" may also be referred to as "second XX," and similarly, "second XX" may also be referred to as "first XX." Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0053] In a first aspect, this application provides a graphite electrode plate that is used in an electrolytic phosphating process. The microparticles that can be released from the surface of the graphite electrode plate are uniformly dispersed in the electrolyte and eventually adsorbed onto the phosphating film layer of the metal wire, thereby significantly improving the lubrication performance of the film layer.

[0054] The graphite electrode plate comprises the following raw materials by weight percentage: 10-20% binder, 1-5% conductive agent, 5-10% carbon fiber, and the balance being graphite powder.

[0055] In some embodiments, the graphite powder has a particle size of 32-100 μm. The binder includes one or more of phenolic resin, epoxy resin, furan resin, or polytetrafluoroethylene resin. The conductive agent includes one or more of graphene, carbon black, or carbon nanotubes. The carbon fiber is one or both of polyacrylonitrile-based carbon fiber and pitch-based carbon fiber.

[0056] In this application, graphite powder, as the main component of the electrode plate, provides good electrical conductivity and chemical stability. As released microparticles, after being adsorbed onto the phosphating film, it can significantly improve the lubrication performance of the film.

[0057] In this application, the binder, as an additive to the electrode plate, can fix the graphite powder on the electrode. The acid-resistant binder can withstand the acidic electrolytic phosphating solution and maintain the structural stability of the electrode.

[0058] In this application, the conductive agent, as part of the electrode conductive network, can effectively improve the conductivity of the electrode, reduce the internal resistance of the electrode, and reduce the power consumption of the electrolytic phosphating process.

[0059] In this application, carbon fiber can enhance the mechanical strength and flexibility of the electrode plate, enabling it to withstand the mechanical stress that may be encountered during manufacturing and use, thus making the electrode plate more durable during electrolytic phosphating.

[0060] In a second aspect, this application provides a method for preparing a graphite electrode plate. The prepared graphite electrode plate is used in an electrolytic phosphating process. Graphite microparticles can be released from the surface of the graphite electrode plate. The graphite microparticles are uniformly dispersed in the electrolyte and eventually adsorbed onto the phosphating film layer of the metal wire, significantly improving the lubrication performance of the film layer.

[0061] The method for preparing the graphite electrode plate includes:

[0062] S101. Add graphite powder and binder according to the formula ratio, heat and stir until evenly mixed to form a mixture.

[0063] S102. Add the conductive agent and carbon fiber to the mixture, continue heating and stirring to ensure that all components are fully mixed to obtain a homogeneous raw material.

[0064] S103. Place the mixed raw materials into a mold and press them into shape to obtain a shaped blank.

[0065] S104. Remove the molded blank from the mold and perform a curing process to ensure that the adhesive is fully cured.

[0066] S105. Slowly cool to room temperature to obtain the electrode plate blank.

[0067] S106. Sandblasting is performed on the electrode blank to improve its surface roughness and increase the release of microparticles.

[0068] In some embodiments, the heating temperature in step S101 is 50°C-140°C, and the stirring speed is maintained at 100-200 r / min.

[0069] The heating temperature in step S102 is 50℃-80℃, and the stirring speed is maintained at 200-300 r / min.

[0070] The pressing process described in step S103 involves a pressing temperature of 150-200℃, an injection pressure of 10-20MPa, and maintaining the pressure for 2-6 minutes.

[0071] The curing process described in step S104 involves heating at a temperature of 50℃-140℃ for 12-24 hours.

[0072] Step S105 involves cooling to room temperature at a rate of 0.2-0.8°C / min.

[0073] In some embodiments, the sandblasting surface treatment in step S106 uses alumina as the abrasive, has a particle size of 120-180 mesh, a sandblasting pressure of 0.4-0.6 MPa, and a sandblasting time of 10-15 min.

[0074] In this application, graphite powder and binder are added according to the formula ratio, heated and stirred until uniformly mixed to form a mixture. The purpose of this step is to ensure that the graphite powder and binder are fully mixed, providing a uniform raw material basis for subsequent preparation processes.

[0075] In this application, the conductive agent and carbon fiber are added to the mixture, and the mixture is heated and stirred to ensure that all components are fully mixed to obtain a homogeneous raw material. This step aims to ensure that the conductive agent and carbon fiber are evenly distributed in the mixture of graphite powder and binder, thereby improving the conductivity and mechanical strength of the electrode plate.

[0076] In this application, the mixed raw materials are placed in a mold and pressed to obtain a molded blank. The purpose of this step is to form the raw materials into a blank with a certain shape and density through pressing, providing a morphologically stable semi-finished product for curing treatment.

[0077] In this application, the molded blank is removed from the mold and subjected to a curing treatment to ensure the binder is fully cured. This step serves to solidify the binder, improve the mechanical strength and acid resistance of the electrode plate, and ensure stable operation of the electrode plate during electrolytic phosphating.

[0078] In this application, the electrode blank is slowly cooled to room temperature to obtain the electrode blank. This step is to prevent the electrode blank from developing internal stress due to excessively rapid temperature changes, which could affect the structural integrity and service life of the electrode.

[0079] In this application, the electrode blank is subjected to sandblasting surface treatment to increase its surface roughness and increase the release of microparticles. The purpose of this step is to form small grooves on the electrode surface through sandblasting, which facilitate the release of microparticles, thereby improving the release amount and uniformity of microparticles during electrolytic phosphating.

[0080] A third aspect of this application provides an electrolytic phosphating solution formulation for use with the aforementioned graphite electrode plate. During the electrolytic phosphating process, the microparticles that can be released from the surface of the graphite electrode plate are uniformly dispersed in the electrolytic phosphating solution and ultimately adsorbed onto the phosphating film layer of the metal wire, significantly improving the lubrication performance of the film layer.

[0081] Each liter of electrolytic phosphating solution contains the following raw materials:

[0082] Phosphoric acid 130-150g, zinc oxide 75-90g, nitrate 80-120g, succinic acid 3-5g, citric acid 3-5g, polyphosphate 3-5g, polycarboxylate 3-5g, dodecylphenol polyoxyethylene ether 0.3-0.5g.

[0083] In some embodiments, the nitrate is any one or more of calcium nitrate, manganese nitrate, and nickel nitrate.

[0084] In some embodiments, the polyphosphate is any one or more of tripolyphosphate (CAS#: 7758-29-4, 13845-36-8 or 14728-39-3) and tetrapolyphosphate (CAS#: 14986-84-6 or 7727-67-5).

[0085] In some embodiments, the polycarboxylate is any one or more of polyacrylic acid (CAS#: 9003-01-4 or 9007-20-9) or polyacrylate (CAS#: 25549-84-2, 25608-12-2 or 9003-03-6), polymethacrylic acid (CAS#: 25087-26-7) or polymethacrylate (CAS#: 25086-62-8), polyaspartic acid (CAS#: 25608-40-6) or polyaspartate (CAS#: 181828-06-8, 34345-47-6 or 31871-95-1).

[0086] In some embodiments, each liter of electrolytic phosphating solution includes the following raw materials:

[0087] 140g phosphoric acid, 80g zinc oxide, 100g nitrate, 4g succinic acid, 4g citric acid, 4g polyphosphate, 4g polycarboxylate, 0.4g dodecylphenol polyoxyethylene ether (CAS#: 68585-34-2, 32612-48-9 or 9041-29-6).

[0088] In this application, the purpose of using nitrates is to enhance current efficiency, optimize dispersibility, maintain the stability of the active ingredient, and control the balance between the hydrogen evolution reaction and the zinc reduction reaction. Nitrate ions can promote the improvement of the current efficiency of the phosphating solution, ensuring that more current is used for the effective formation of the film and reducing the loss of ineffective current. In addition, nitrate ions can also enhance the dispersibility of the phosphating solution, which is crucial for forming a uniform film on workpieces with complex shapes. At the same time, nitrate ions help maintain the dissolved state of metal ions and prevent the active ingredient from precipitating in non-cathode areas.

[0089] In this application, the combined use of succinic acid and citric acid effectively buffers free acid in the phosphating solution, enabling precise control of the solution's acidity and ensuring optimal electrochemical conditions during electrolytic phosphating. Acidity control is a key factor affecting film uniformity and quality. By adjusting this acid combination, the microstructure of the coating can be optimized, porosity and cracking reduced, thereby improving the coating's appearance quality.

[0090] In this application, polyphosphates and polycarboxylates are used as dispersants. These water-soluble polymers can reduce the interaction forces between graphite particles, prevent particle aggregation, and promote particle dispersion.

[0091] In this application, dodecylphenol polyoxyethylene ether is used as a dispersant surfactant, which can reduce the surface tension of the electrolytic phosphating solution and promote the dispersion and flow of graphite particles in the electrolyte.

[0092] The fourth aspect of this application provides a method for preparing an electrolytic phosphating solution, which is used in conjunction with the graphite electrode plate described above. During the electrolytic phosphating process, the microparticles that can be released from the surface of the graphite electrode plate are uniformly dispersed in the electrolyte and eventually adsorbed onto the phosphating film layer of the metal wire, significantly improving the lubrication performance of the film layer.

[0093] The preparation method of the electrolytic phosphating includes the following steps:

[0094] S201. Prepare materials according to the weight of the corresponding raw materials in each liter of electrolytic phosphating solution;

[0095] S202. Add zinc oxide and phosphoric acid to deionized water, heat to 60-70℃, and stir thoroughly until the zinc oxide reaction is complete;

[0096] S203. Lower the temperature to 35-45℃, add nitrate, polyphosphate and polycarboxylate, and stir thoroughly until all the added raw materials are dissolved;

[0097] S204. Add succinic acid, citric acid, and dodecylphenol polyoxyethylene ether and stir until dissolved. Then cool to room temperature to obtain an electrolytic phosphating solution.

[0098] In some embodiments, in step S202, the temperature is maintained at 60°C.

[0099] In some embodiments, in step S203, the temperature is maintained at 45°C.

[0100] In some embodiments, in step S202, the stirring speed is maintained at 100-200 r / min.

[0101] In some embodiments, in step S203, the stirring speed is maintained at 80-160 r / min.

[0102] The fifth aspect of this application provides an electrolytic phosphating process that utilizes graphite electrode plates to release microparticles to enhance the lubrication performance of electrolytic phosphating films. The graphite electrode plates are used as the anode in the electrolytic phosphating process. During the electrolytic phosphating process, the microparticles that can be released from the surface of the graphite electrode plates are uniformly dispersed in the electrolyte and eventually adsorbed onto the phosphating film of the metal wire, significantly improving the lubrication performance of the film.

[0103] The electrolytic phosphating process includes the following steps:

[0104] S301. Install the graphite electrode plate in the electrolytic phosphating cell as the anode and connect it to the positive terminal of the electrolytic power supply.

[0105] S302. Pour the electrolytic phosphating solution into the electrolytic phosphating tank, heat, and stir.

[0106] S303. Connect the raw material coiled wire sequentially to the straightening machine, belt sander, voltage guide roller, water washing tank, electrolytic phosphating tank, post-water washing tank, and inverted take-up machine.

[0107] S304. Set the current density and wire speed, turn on the electrolytic phosphating power supply and invert the wire to perform electrolytic phosphating treatment on the raw wire.

[0108] S305. A phosphating film is formed on the surface of the metal wire, and at the same time, the microparticles released by the graphite electrode enter the electrolyte and are adsorbed on the phosphating film, enhancing the lubrication performance of the film.

[0109] In some embodiments, the heating temperature in step S302 is 40℃-60℃, and the stirring speed is maintained at 100-200 r / min.

[0110] In some embodiments, the current density in step S304 is 5-25 A / dm. 2 The routing speed was maintained at 0.6-1.6 m / s.

[0111] In this application, the electrolytic phosphating solution is heated and stirred. This step serves to promote the release of graphite particles into the electrolytic phosphating solution and accelerates the uniform distribution of the particles through heating and stirring.

[0112] In this application, the raw material coiled wire is sequentially connected to a straightening machine, a belt sander, a conductive roller, a washing tank, an electrolytic phosphating tank, a post-washing tank, and an inverted take-up machine. The purpose of this step is to ensure the cleanliness of the wire surface through pretreatment steps (straightening, oxide layer removal, washing, etc.), ensuring that the wire surface is free of impurities, preparing it for electrolytic phosphating, and improving the adhesion and uniformity of the phosphating film.

[0113] In this application, the current density and wire speed are set, the electrolytic phosphating power supply is turned on, and the wire is inverted for winding to perform electrolytic phosphating treatment. The purpose of this step is to control the parameters of the electrolytic phosphating process, ensuring the formation speed and quality of the phosphating film on the wire surface, while maintaining production efficiency.

[0114] The following description is based on specific embodiments.

[0115] The raw materials used in the following embodiments can all be purchased from the market, or they can be obtained by self-preparation. As an example, the information on the raw material acquisition methods in a specific embodiment of the present invention is shown in the table below:

[0116] Raw material name CAS number Phenolic resin 26678-93-3 Epoxy resin 24969-06-0 Furan resin 25212-86-6 polytetrafluoroethylene resin 25067-11-2 Polyacrylonitrile-based carbon fiber 70892-43-2 Pitch-based carbon fiber 8052-42-4

[0117] Example 1

[0118] A graphite electrode plate comprises the following raw materials by weight percentage:

[0119] The composition consists of 10% phenolic resin, 10% epoxy resin, 3% graphene, 2% carbon black, 10% polyacrylonitrile-based carbon fiber, and the remainder is graphite powder with a particle size of 100 μm.

[0120] The above-mentioned method for preparing graphite plates includes the following steps:

[0121] S101. Add graphite powder and binder according to the formula ratio, heat to 140℃, and stir at 200r / min to form a mixture.

[0122] S102. Add the conductive agent and carbon fiber to the mixture, continue heating to 80°C, and stir at 300 r / min to ensure that all components are fully mixed to obtain a homogeneous raw material.

[0123] S103. Place the mixed raw materials into the mold and press them into shape. The pressing temperature is 200℃, the injection pressure is 20MPa, and the pressure is maintained for 6 minutes to obtain the molded blank.

[0124] S104. Remove the molded blank from the mold and perform curing treatment at a curing temperature of 140℃ for 24 hours to allow the adhesive to fully cure.

[0125] S105. Slowly cool to room temperature at a rate of 0.8℃ / min to obtain the electrode plate blank.

[0126] S106. The electrode plate blank is subjected to sandblasting surface treatment. The abrasive is alumina with a particle size of 180 mesh, the sandblasting pressure is 0.6 MPa, and the sandblasting time is 15 min.

[0127] An electrolytic phosphating solution, each liter of which comprises the following raw materials:

[0128] 150g phosphoric acid, 90g zinc oxide, 110g calcium nitrate, 10g nickel nitrate, 5g succinic acid, 5g citric acid, 5g sodium tripolyphosphate, 5g sodium polyacrylate, 0.5g dodecylphenol polyoxyethylene ether, with the remainder being water.

[0129] The preparation method of the above-mentioned electrolytic phosphating solution includes the following steps:

[0130] S201. Prepare materials according to the weight of the corresponding raw materials in each liter of electrolytic phosphating solution;

[0131] S202. Add zinc oxide and phosphoric acid to deionized water, heat to 70°C, stir thoroughly, and maintain the stirring speed at 200 r / min until the zinc oxide reaction is complete;

[0132] S203. Lower the temperature to 45℃, add nitrates (calcium nitrate, nickel nitrate), polyphosphates (sodium tripolyphosphate) and polycarboxylate (sodium polyacrylate), and stir thoroughly at a stirring speed of 160 r / min until all the added raw materials are dissolved;

[0133] S204. Add succinic acid, citric acid, and dodecylphenol polyoxyethylene ether and stir until dissolved. Then cool to room temperature to obtain an electrolytic phosphating solution.

[0134] An electrolytic phosphating process that utilizes a graphite anode plate to release microparticles to enhance the lubrication performance of an electrolytic phosphating film includes the following steps:

[0135] S301. Install the graphite electrode plate in the electrolytic phosphating cell as the anode and connect it to the positive terminal of the electrolytic power supply.

[0136] S302. Inject the electrolytic phosphating solution into the electrolytic phosphating tank, heat and stir. The heating temperature is 60℃ and the stirring speed is maintained at 200r / min.

[0137] S303. Connect the raw material coiled wire sequentially to the straightening machine, belt sander, voltage guide roller, water washing tank, electrolytic phosphating tank, post-water washing tank, and inverted take-up machine.

[0138] S304. Set the current density and wire speed, turn on the electrolytic phosphating power supply and invert the winding position to perform electrolytic phosphating treatment on the raw wire. The current density is 25A / dm. 2 The wiring speed was maintained at 1.6m / s.

[0139] S305. A phosphating film is formed on the surface of the metal wire, and at the same time, the microparticles released by the graphite anode plate enter the electrolyte and are adsorbed on the phosphating film.

[0140] Example 2

[0141] A graphite electrode plate comprises the following raw materials by weight percentage:

[0142] The composition consists of 5% phenolic resin, 5% epoxy resin, 0.6% graphene, 0.4% carbon black, 5% polyacrylonitrile-based carbon fiber, and the remainder is graphite powder with a particle size of 32μm.

[0143] The above-mentioned method for preparing graphite plates includes the following steps:

[0144] S101. Add graphite powder and binder according to the formula ratio, heat to 50℃, and stir at 100r / min to form a uniform mixture.

[0145] S102. Add the conductive agent and carbon fiber to the mixture, continue heating to 50°C, and stir at 200 r / min to ensure that all components are fully mixed to obtain a homogeneous raw material.

[0146] S103. Place the mixed raw materials into the mold and press them into shape. The pressing temperature is 150℃, the injection pressure is 10MPa, and the pressure is maintained for 2 minutes to obtain the shaped blank.

[0147] S104. Remove the molded blank from the mold and perform curing treatment at a curing temperature of 50℃ for 12 hours to allow the adhesive to fully cure.

[0148] S105. Slowly cool to room temperature at a rate of 0.2℃ / min to obtain the electrode plate blank.

[0149] S106. The electrode plate blank is subjected to sandblasting surface treatment. The abrasive is alumina with a particle size of 120 mesh, the sandblasting pressure is 0.4 MPa, and the sandblasting time is 10 min.

[0150] An electrolytic phosphating solution, each liter of which comprises the following raw materials:

[0151] 130g phosphoric acid, 75g zinc oxide, 75g calcium nitrate, 5g nickel nitrate, 3g succinic acid, 3g citric acid, 3g sodium tripolyphosphate, 3g sodium polyacrylate, 0.3g dodecylphenol polyoxyethylene ether, with the remainder being water.

[0152] The preparation method of the above-mentioned electrolytic phosphating solution includes the following steps:

[0153] S201. Prepare materials according to the weight of the corresponding raw materials in each liter of electrolytic phosphating solution;

[0154] S202. Add zinc oxide and phosphoric acid to deionized water, heat to 60°C, and stir thoroughly at a stirring speed of 100 r / min until the zinc oxide reaction is complete;

[0155] S203. Lower the temperature to 45℃, add nitrate, polyphosphate and polycarboxylate, and stir thoroughly at a stirring speed of 80r / min until all the added raw materials are dissolved;

[0156] S204. Add succinic acid, citric acid, and dodecylphenol polyoxyethylene ether and stir until dissolved. Then cool to room temperature to obtain an electrolytic phosphating solution.

[0157] An electrolytic phosphating process that utilizes a graphite anode plate to release microparticles to enhance the lubrication performance of an electrolytic phosphating film includes the following steps:

[0158] S301. Install the graphite electrode plate in the electrolytic phosphating cell as the anode and connect it to the positive terminal of the electrolytic power supply.

[0159] S302. Inject the electrolytic phosphating solution into the electrolytic phosphating tank, heat and stir. The heating temperature is 60℃ and the stirring speed is maintained at 200r / min.

[0160] S303. Connect the raw material coiled wire sequentially to the straightening machine, belt sander, voltage guide roller, water washing tank, electrolytic phosphating tank, post-water washing tank, and inverted take-up machine.

[0161] S304. Set the current density and wire speed, turn on the electrolytic phosphating power supply and invert the winding position to perform electrolytic phosphating treatment on the raw wire. The current density is 25A / dm. 2 The wiring speed was maintained at 1.6m / s.

[0162] S305. A phosphating film is formed on the surface of the metal wire, and at the same time, the microparticles released by the graphite anode plate enter the electrolyte and are adsorbed on the phosphating film.

[0163] Example 3

[0164] A graphite electrode plate comprises the following raw materials by weight percentage:

[0165] The composition consists of 7.5% phenolic resin, 7.5% epoxy resin, 2% graphene, 1% carbon black, 7.5% polyacrylonitrile-based carbon fiber, and the remainder is graphite powder with a particle size of 66 μm.

[0166] The above-mentioned method for preparing graphite plates includes the following steps:

[0167] S101. Add graphite powder and binder according to the formula ratio, heat to 95℃, and stir at 150r / min to form a mixture.

[0168] S102. Add the conductive agent and carbon fiber to the mixture, continue heating to 65°C, and stir at a speed of 250 r / min to ensure that all components are fully mixed to obtain a homogeneous raw material.

[0169] S103. Place the mixed raw materials into the mold and press them into shape. The pressing temperature is 175℃, the injection pressure is 15MPa, and the pressure is maintained for 4 minutes to obtain the molded blank.

[0170] S104. Remove the molded blank from the mold and perform curing treatment at a curing temperature of 95℃ for 18 hours to allow the adhesive to fully cure.

[0171] S105. Slowly cool to room temperature at a rate of 0.5℃ / min to obtain the electrode plate blank.

[0172] S106. The electrode plate blank is subjected to sandblasting surface treatment. The abrasive is alumina with a particle size of 150 mesh, the sandblasting pressure is 0.5 MPa, and the sandblasting time is 12.5 min.

[0173] An electrolytic phosphating solution, each liter of which comprises the following raw materials:

[0174] 140g phosphoric acid, 82.5g zinc oxide, 92.5g calcium nitrate, 5g manganese nitrate, 2.5g nickel nitrate, 4g succinic acid, 4g citric acid, 4g potassium tripolyphosphate, 4g sodium polyacrylate, 0.4g dodecylphenol polyoxyethylene ether, with the remainder being water.

[0175] The preparation method of the above-mentioned electrolytic phosphating solution includes the following steps:

[0176] S201. Prepare materials according to the weight of the corresponding raw materials in each liter of electrolytic phosphating solution;

[0177] S202. Add zinc oxide and phosphoric acid to deionized water, heat to 65°C, and stir thoroughly at a stirring speed of 150 r / min until the zinc oxide reaction is complete;

[0178] S203. Lower the temperature to 40℃, add nitrate, polyphosphate and polycarboxylate, and stir thoroughly at a stirring speed of 120r / min until all the added raw materials are dissolved;

[0179] S204. Add succinic acid, citric acid, and dodecylphenol polyoxyethylene ether and stir until dissolved. Then cool to room temperature to obtain an electrolytic phosphating solution.

[0180] An electrolytic phosphating process that utilizes a graphite anode plate to release microparticles to enhance the lubrication performance of an electrolytic phosphating film includes the following steps:

[0181] S301. Install the graphite electrode plate in the electrolytic phosphating cell as the anode and connect it to the positive terminal of the electrolytic power supply.

[0182] S302. Inject the electrolytic phosphating solution into the electrolytic phosphating tank, heat and stir. The heating temperature is 50℃ and the stirring speed is maintained at 150r / min.

[0183] S303. Connect the raw material coiled wire sequentially to the straightening machine, belt sander, voltage guide roller, water washing tank, electrolytic phosphating tank, post-water washing tank, and inverted take-up machine.

[0184] S304. Set the current density and wire speed, turn on the electrolytic phosphating power supply and invert the winding position to perform electrolytic phosphating treatment on the raw wire. The current density is 15A / dm. 2 The wiring speed was maintained at 1.1m / s.

[0185] S305. A phosphating film is formed on the surface of the metal wire, and at the same time, the microparticles released by the graphite anode plate enter the electrolyte and are adsorbed on the phosphating film.

[0186] Example 4

[0187] A graphite electrode plate comprises the following raw materials by weight percentage:

[0188] The composition consists of 10% phenolic resin, 10% epoxy resin, 3% graphene, 2% carbon black, 10% polyacrylonitrile-based carbon fiber, and the remainder is graphite powder with a particle size of 100 μm.

[0189] The above-mentioned method for preparing graphite plates includes the following steps:

[0190] S101. Add graphite powder and binder according to the formula ratio, heat to 140℃, and stir at 200r / min to form a mixture.

[0191] S102. Add the conductive agent and carbon fiber to the mixture, continue heating to 80°C, and stir at 300 r / min to ensure that all components are fully mixed to obtain a homogeneous raw material.

[0192] S103. Place the mixed raw materials into the mold and press them into shape. The pressing temperature is 200℃, the injection pressure is 20MPa, and the pressure is maintained for 6 minutes to obtain the molded blank.

[0193] S104. Remove the molded blank from the mold and perform curing treatment at a curing temperature of 140℃ for 24 hours to allow the adhesive to fully cure.

[0194] S105. Slowly cool to room temperature at a rate of 0.8℃ / min to obtain the electrode plate blank.

[0195] S106. The electrode plate blank is subjected to sandblasting surface treatment. The abrasive is alumina with a particle size of 180 mesh, the sandblasting pressure is 0.6 MPa, and the sandblasting time is 15 min.

[0196] An electrolytic phosphating solution, each liter of which comprises the following raw materials:

[0197] 130g phosphoric acid, 75g zinc oxide, 75g calcium nitrate, 5g nickel nitrate, 3g succinic acid, 3g citric acid, 3g sodium tripolyphosphate, 3g sodium polyacrylate, 0.3g dodecylphenol polyoxyethylene ether, with the remainder being water.

[0198] The preparation method of the above-mentioned electrolytic phosphating solution includes the following steps:

[0199] S201. Prepare materials according to the weight of the corresponding raw materials in each liter of electrolytic phosphating solution;

[0200] S202. Add zinc oxide and phosphoric acid to deionized water, heat to 60°C, and stir thoroughly at a stirring speed of 100 r / min until the zinc oxide reaction is complete;

[0201] S203. Lower the temperature to 45℃, add nitrate, polyphosphate and polycarboxylate, and stir thoroughly at a stirring speed of 80r / min until all the added raw materials are dissolved;

[0202] S204. Add succinic acid, citric acid, and dodecylphenol polyoxyethylene ether and stir until dissolved. Then cool to room temperature to obtain an electrolytic phosphating solution.

[0203] An electrolytic phosphating process that utilizes a graphite anode plate to release microparticles to enhance the lubrication performance of an electrolytic phosphating film includes the following steps:

[0204] S301. Install the graphite electrode plate in the electrolytic phosphating cell as the anode and connect it to the positive terminal of the electrolytic power supply.

[0205] S302. Inject the electrolytic phosphating solution into the electrolytic phosphating tank, heat and stir. The heating temperature is 60℃ and the stirring speed is maintained at 200r / min.

[0206] S303. Connect the raw material coiled wire sequentially to the straightening machine, belt sander, voltage guide roller, water washing tank, electrolytic phosphating tank, post-water washing tank, and inverted take-up machine.

[0207] S304. Set the current density and wire speed, turn on the electrolytic phosphating power supply and invert the winding position to perform electrolytic phosphating treatment on the raw wire. The current density is 25A / dm. 2The wiring speed was maintained at 1.6m / s.

[0208] S305. A phosphating film is formed on the surface of the metal wire, and at the same time, the microparticles released by the graphite anode plate enter the electrolyte and are adsorbed on the phosphating film.

[0209] Example 5

[0210] A graphite electrode plate comprises the following raw materials by weight percentage:

[0211] The composition consists of 5% phenolic resin, 5% epoxy resin, 0.6% graphene, 0.4% carbon black, 5% polyacrylonitrile-based carbon fiber, and the remainder is graphite powder with a particle size of 32μm.

[0212] The above-mentioned method for preparing graphite plates includes the following steps:

[0213] S101. Add graphite powder and binder according to the formula ratio, heat to 50℃, and stir at 100r / min to form a uniform mixture.

[0214] S102. Add the conductive agent and carbon fiber to the mixture, continue heating to 50°C, and stir at 200 r / min to ensure that all components are fully mixed to obtain a homogeneous raw material.

[0215] S103. Place the mixed raw materials into the mold and press them into shape. The pressing temperature is 150℃, the injection pressure is 10MPa, and the pressure is maintained for 2 minutes to obtain the shaped blank.

[0216] S104. Remove the molded blank from the mold and perform curing treatment at a curing temperature of 50℃ for 12 hours to allow the adhesive to fully cure.

[0217] S105. Slowly cool to room temperature at a rate of 0.2℃ / min to obtain the electrode plate blank.

[0218] S106. The electrode plate blank is subjected to sandblasting surface treatment. The abrasive is alumina with a particle size of 120 mesh, the sandblasting pressure is 0.4 MPa, and the sandblasting time is 10 min.

[0219] An electrolytic phosphating solution, each liter of which comprises the following raw materials:

[0220] 150g phosphoric acid, 90g zinc oxide, 110g calcium nitrate, 10g nickel nitrate, 5g succinic acid, 5g citric acid, 5g sodium tripolyphosphate, 5g sodium polyacrylate, 0.5g dodecylphenol polyoxyethylene ether, with the remainder being water.

[0221] The preparation method of the above-mentioned electrolytic phosphating solution includes the following steps:

[0222] S201. Prepare materials according to the weight of the corresponding raw materials in each liter of electrolytic phosphating solution;

[0223] S202. Add zinc oxide and phosphoric acid to deionized water, heat to 70°C, stir thoroughly, and maintain the stirring speed at 200 r / min until the zinc oxide reaction is complete;

[0224] S203. Lower the temperature to 45℃, add nitrate, polyphosphate and polycarboxylate, and stir thoroughly at a stirring speed of 160r / min until all the added raw materials are dissolved;

[0225] S204. Add succinic acid, citric acid, and dodecylphenol polyoxyethylene ether and stir until dissolved. Then cool to room temperature to obtain an electrolytic phosphating solution.

[0226] An electrolytic phosphating process that utilizes a graphite anode plate to release microparticles to enhance the lubrication performance of an electrolytic phosphating film includes the following steps:

[0227] S301. Install the graphite electrode plate in the electrolytic phosphating cell as the anode and connect it to the positive terminal of the electrolytic power supply.

[0228] S302. Inject the electrolytic phosphating solution into the electrolytic phosphating tank, heat and stir. The heating temperature is 60℃ and the stirring speed is maintained at 200r / min.

[0229] S303. Connect the raw material coiled wire sequentially to the straightening machine, belt sander, voltage guide roller, water washing tank, electrolytic phosphating tank, post-water washing tank, and inverted take-up machine.

[0230] S304. Set the current density and wire speed, turn on the electrolytic phosphating power supply and invert the winding position to perform electrolytic phosphating treatment on the raw wire. The current density is 25A / dm. 2 The wiring speed was maintained at 1.6m / s.

[0231] S305. A phosphating film is formed on the surface of the metal wire, and at the same time, the microparticles released by the graphite anode plate enter the electrolyte and are adsorbed on the phosphating film.

[0232] Comparative Example 1

[0233] An electrolytic phosphating process that utilizes graphite anode plates to release microparticles to enhance the lubrication performance of electrolytic phosphating films includes the following steps: the raw material composition of the graphite electrode plate is adjusted to 2.5% phenolic resin, 2.5% epoxy resin, 0% graphene, 0% carbon black, 2.5% polyacrylonitrile-based carbon fiber, and 92.5% graphite powder with a particle size of 66 μm, with the remaining conditions being the same as in Example 3.

[0234] Comparative Example 2

[0235] An electrolytic phosphating process that utilizes the release of microparticles from a graphite anode plate to enhance the lubrication performance of an electrolytic phosphating film includes the following steps: the graphite electrode plate is not subjected to the sandblasting treatment in step S106, and the remaining conditions are the same as in Example 3.

[0236] Comparative Example 3

[0237] An electrolytic phosphating process is proposed that does not prepare the above-mentioned graphite anode plate, and does not use the above-mentioned graphite anode plate as the anode for electrolytic phosphating. Instead, a ruthenium-iridium coated electrode plate is used for electrolytic phosphating, and the remaining conditions are the same as in Example 3.

[0238] Comparative Example 4

[0239] An electrolytic phosphating process that utilizes the release of microparticles from a graphite anode plate to enhance the lubrication performance of an electrolytic phosphating film includes the following steps: no polyphosphates, polycarboxylatees, or dodecylphenol polyoxyethylene ethers are added to the electrolytic phosphating solution formulation, and the remaining conditions are the same as in Example 3.

[0240] Comparative Example 5

[0241] An electrolytic phosphating process that utilizes the release of microparticles from a graphite anode plate to enhance the lubrication performance of an electrolytic phosphating film includes the following steps: Step S304, the current density is 1 A / dm³. 2 The remaining conditions are the same as in Example 3.

[0242] Comparative Example 6

[0243] An electrolytic phosphating process that utilizes the release of microparticles from a graphite anode plate to enhance the lubrication performance of an electrolytic phosphating film includes the following steps: Step S304, the current density is 50 A / dm³. 2 The remaining conditions are the same as in Example 3.

[0244] The technical indicators and test results of the graphite electrode plates, electrolytic phosphating solutions, and phosphating films on the wire rods prepared in the above examples and comparative examples are summarized as follows:

[0245] The graphite plates prepared in Examples 1-5 and Comparative Examples 1 and 2 were tested. The flexural strength of the graphite plates was tested according to GB / T 13465.2-2014, the compressive strength was tested according to GB / T 13465.3-2014, and the electrical resistance was tested according to GB / T 24525-2009. The results are as follows. Figure 1 As shown.

[0246] from Figure 1The results showed that, compared with the comparative example, the graphite electrode in the embodiment had better bending strength, compressive strength and lower resistivity, indicating that the addition of carbon fiber and conductive agent in the graphite electrode formulation and the sandblasting surface treatment gave the graphite electrode better mechanical strength and conductivity, thereby improving its stability in the electrolytic phosphating process.

[0247] like Figure 2 As shown, the electrolytic phosphating solutions prepared in Examples 3, 1, 2, and 3 were observed after use. The electrolytic phosphating solution of Example 3 appeared light gray after use, indicating an appropriate release of graphite particles. The uniform color of the liquid indicates that the graphite particles were evenly dispersed in the solution during electrolysis, without precipitation or aggregation. This uniform dispersion helps the graphite particles form a uniform phosphating film on the metal surface, thereby improving lubrication performance.

[0248] The electrolytic phosphating solution in Comparative Example 1 turned dark gray after use, and the color distribution was uneven. The photo shows graphite precipitate at the bottom of the solution. This may be due to improper design of the graphite electrode formulation and unreasonable ratio of binder and other additives, resulting in excessive release of graphite particles during electrolysis, exceeding the stable dispersion capacity of the solution, thus producing precipitation.

[0249] The electrolytic phosphating solution in Comparative Example 2 was almost transparent after use, indicating that very little graphite particles were released. This may be because the graphite electrode preparation process did not include sandblasting, preventing the surface of the graphite electrode from effectively releasing graphite particles into the solution.

[0250] The electrolytic phosphating solution of Comparative Example 3 remained transparent after use. Since the comparative example did not use graphite electrodes, this clearly indicates that no graphite particles were released.

[0251] like Figure 3-8 As shown, metallographic images of the electrolytic phosphating films prepared in Examples 3, 4, 5, and 6 were observed, and EDS analysis was performed on the electrolytic phosphating films prepared in Examples 3 and 4.

[0252] It can be observed that:

[0253] like Figure 3 and Figure 7 As shown, the phosphate film of Example 3 exhibits high uniformity and integrity. Metallographic and EDS analyses revealed that the phosphate film is tightly bonded to the graphite particles, forming a continuous and defect-free coating. This dense film not only uniformly coats the entire surface of the wire but also successfully fills the grooves and micro-defects on the wire surface, thus providing a smooth and uniform surface that contributes to improved lubrication performance.

[0254] like Figure 4 and Figure 8 As shown, the phosphating film in Comparative Example 4 exhibits a significant difference. Metallographic and EDS analyses reveal that the film is primarily composed of phosphates and [missing information - likely a specific component or ingredient]. The electrolytic phosphating solution formulation in Comparative Example 4 resulted in a smaller number of graphite particles transferring to the phosphating film. Consequently, the film coverage was uneven, with noticeable defects and gaps, failing to completely fill the grooves and defects on the wire surface, leading to a decrease in the film's lubrication performance.

[0255] like Figure 5 As shown in the metallographic photograph of Comparative Example 5, almost no obvious film layer is formed on the wire surface. This is because the current density is too low, resulting in insufficient electrolytic phosphating reaction, which severely affects film layer formation, fails to provide adequate coverage and protection, exposes the substrate surface, and results in poor lubrication performance.

[0256] like Figure 6 As shown in the metallographic photograph of Comparative Example 6, another problem is revealed. Due to excessive current density, the grain growth rate of the phosphating film is too rapid, resulting in pores in the film in high-stress areas. This incomplete film not only fails to effectively cover the substrate, but the damage to the film in high-stress areas also leads to a significant decrease in lubrication performance.

[0257] The wires with phosphating films formed on the surface prepared in Examples 1-5 and Comparative Examples 1-5 were subjected to pull-out tests. The wires were 22A and had a diameter of [missing information]. Pull to Using an aperture of The tungsten carbide mold was used, and the pull-out force during the wire drawing process was recorded using an HT-LL-2000 tensile strength tester. The results are as follows: Figure 9 As shown.

[0258] The results showed that the wires in the examples generally required lower drawing forces than those in the comparative examples, and the phosphating film in the examples exhibited superior lubrication performance. The design of the graphite electrode plate, the electrolytic phosphating solution, and the electrolytic phosphating process conditions in the examples optimized the microstructure of the phosphating film, resulting in a film containing graphite microparticles that enhance lubrication. These microparticles act as a lubricant during the drawing process, reducing friction between the metal and the die.

[0259] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electrolytic phosphating process, characterized in that The electrolytic phosphating is performed using a graphite electrode plate as an anode, comprising the following steps: S301. Mounting the graphite electrode plate in an electrolytic phosphating tank as an anode, and connecting it to the positive pole of an electrolytic power supply; S302. Injecting electrolytic phosphating solution into the electrolytic phosphating tank, heating, and stirring; S303. Connecting the raw material coiled wire to a straightening machine, a sand belt machine, a conductive pressure roller, a water washing tank, an electrolytic phosphating tank, a post water washing tank, and an inverted wire collecting machine in sequence; S304. Setting the current density and the wire running speed, turning on the electrolytic phosphating power supply and the inverted wire collecting machine, and performing electrolytic phosphating treatment on the raw material wire; Each liter of electrolytic phosphating solution comprises the following raw materials: Phosphoric acid 130-150 g, zinc oxide 75-90 g, nitrate 80-120 g, succinic acid 3-5 g, citric acid 3-5 g, polyphosphate 3-5 g, polycarboxylate 3-5 g, and dodecyl phenol polyoxyethylene ether 0.3-0.5 g; The graphite electrode plate comprises the following raw materials in terms of weight percentage: Binder 10-20%, conductive agent 1-5%, carbon fiber 5-10%, and the balance being graphite powder; The particle size of the graphite powder is 32-100 μm; The binder comprises one or more of phenolic resin, epoxy resin, furan resin, or polytetrafluoroethylene resin; The conductive agent comprises one or more of graphene, carbon black, or carbon nanotube; The carbon fiber comprises one or both of polyacrylonitrile-based carbon fiber or pitch-based carbon fiber; The preparation method of the graphite electrode plate comprises the following steps: S101. Feeding the graphite powder and the binder according to the raw material composition ratio of the graphite electrode plate, heating, stirring, and mixing uniformly to form a mixture; S102. Adding the conductive agent and the carbon fiber to the mixture, continuing to heat, stir, and mix to obtain a mixed raw material; S103. Placing the mixed raw material into a mold for compression molding to obtain a molded blank; S104. Taking the molded blank out of the mold for curing treatment; S105. After the curing treatment, slowly cooling to room temperature to obtain an electrode plate blank; S106. Performing sandblasting surface treatment on the electrode plate blank to obtain a graphite electrode plate; In step S106, the sandblasting surface treatment, the abrasive is alumina, the abrasive particle size is 120-180 mesh, the sandblasting pressure is 0.4-0.6 MPa, and the sandblasting time is 10-15 min.

2. The electrolytic phosphating process according to claim 1, characterized in that In step S302, the heating temperature is 40-60 ℃, and the stirring speed is maintained at 100-200 r / min.

3. The electrolytic phosphating process according to claim 1, characterized in that In step S304, the current density is 5-25 A / dm 2 The wire speed is maintained at 0.6-1.6 m / s.

4. Use of an electrolytic phosphating process, characterized in that The electrolytic phosphating process of any one of claims 1-3 is applied to the surface treatment of a raw material wire.

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