Equipment and method for electrically etching metal wire and metal wire product

Abstract

The invention relates to equipment and a method for electrically etching a metal wire and a metal wire product. The equipment for electrically etching comprises a wire feeding coil, a pretreatment tank, an etching tank, a post-treatment tank and a wire collecting coil which are sequentially arranged in the machining direction. Wherein the pretreatment tank removes oxide layers and dirt on the surfaces of metal wires through chemical pickling or ultrasonic cleaning; the etching tank is provided with a special electrolyte circulating system, so that the dynamic flowing, cleanness and concentration stability of the electrolyte are maintained, and the electric etching uniformity is ensured; and the post-treatment tank is used for carrying out surface treatment on the etched metal wire by utilizing a passivation solution, so that the corrosion resistance is enhanced. Each groove body is provided with a corresponding cathode copper bar, an anode copper bar, a cathode titanium basket, an anode rolling shaft and other structures, and the wire feeding coil and the wire collecting coil have accurate tension adjusting and speed control functions. Compared with the prior art, through innovative design and integrated automatic control, uniform etching of the metal wire is achieved, and meanwhile the machining efficiency and the mechanical strength of the metal wire are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of electric etching, and in particular to a device and a method for electric etching of a metal wire. Background Art

[0002] Metal mesh is widely used in the fields of water electrolysis, hydrogen production, battery current collector, etc. due to its excellent electrical conductivity and mechanical strength. However, traditional materials such as nickel-based metal mesh are difficult to meet the needs of electrochemical reactions for high active sites due to their smooth surface and low catalytic activity. In order to improve performance, researchers have tried a variety of technologies, such as additive methods to load catalysts on metal surfaces. However, these methods are complicated, and the loaded catalysts have insufficient binding force and are easily detached in industrial environments, limiting their stability during long-term use.

[0003] In contrast, subtractive methods such as electro-etching technology create more micro-nano structures by removing part of the material on the metal surface, thereby significantly increasing the catalytic active sites and enhancing the efficiency of the electrolytic reaction. However, the current electro-etching technology mainly processes the woven metal wire mesh. Although this method can improve the catalytic performance of the metal wire mesh, it also inevitably reduces its mechanical strength, causing the metal wire mesh to be easily deformed or damaged in actual use, especially showing poor structural stability under high-pressure fluid conditions.

[0004] In order to solve these problems, some researchers have proposed a process route of first processing the metal wire and then weaving it into a mesh. This method avoids directly weakening the finished mesh structure, but there are great challenges in uniformly electro-etching a single metal wire. First, most traditional electro-etching equipment is designed for flat or larger metal sheets, and there is a lack of dedicated equipment and methods for slender metal wires; secondly, due to the small size of the metal wire, the current distribution is easily limited, resulting in unevenness during the etching process. In addition, the continuous movement of the metal wire increases the complexity of the process, and current manual or semi-automatic electro-etching equipment is difficult to meet the requirements of efficient large-scale production.

[0005] Therefore, there is an urgent need to develop an efficient, uniform and automated metal wire electroetching method to achieve continuous processing of a single metal wire. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a device, method and metal wire product for electro-etching metal wire. Through innovative design and integrated automatic control, uniform etching of the metal wire is achieved while ensuring processing efficiency and the mechanical strength of the metal wire.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A first aspect of the present invention provides an apparatus for electro-etching a metal wire, comprising a wire feed roll, a pre-treatment tank, an etching tank, a post-treatment tank, and a wire collection roll arranged in sequence along a processing direction;

[0009] The pretreatment tank, etching tank and post-treatment tank all include a tank body, a cathode copper bar and an anode copper bar arranged on the tank body, a cathode titanium basket arranged in the tank body, and an anode roller arranged in the tank body, wherein the cathode titanium basket is connected to the cathode copper bar, and the anode roller is connected to the anode copper bar;

[0010] The pretreatment tank is also provided with a cleaning chamber for accommodating the metal wire and containing a chemical pickling solution and an ultrasonic cleaning gas, so as to remove the oxide layer and dirt on the surface of the metal wire;

[0011] An electrolyte circulation system is also provided inside the etching tank, and the electrolyte circulation system is used to maintain the dynamic flow, cleanliness and stable concentration of the electrolyte;

[0012] A passivation solution for passivating the etched metal wire is arranged inside the post-processing tank.

[0013] Furthermore, the etching tank is provided with two liquid circulation ports, and the etching tank is also provided with an electrolyte circulation system, and the electrolyte circulation system includes a filtering device, a liquid replenishing device, and an electrolyte storage container;

[0014] The liquid circulation port is arranged at the bottom or side of the tank body;

[0015] The filtering device is a screen filter;

[0016] The liquid circulation port includes an electrolyte inlet and an electrolyte outlet, the electrolyte inlet is connected to the outlet of the filter device through a first pipeline, the inlet of the filter device is connected to the outlet of the liquid replenishing device through a second pipeline, and the liquid inlet of the liquid replenishing device is connected to the electrolyte storage container;

[0017] The electrolyte outlet is connected to the electrolyte storage container and is used to collect the discharged electrolyte;

[0018] The fluid infusion device is a fluid infusion pump.

[0019] Furthermore, the chemical pickling solution in the pretreatment tank is a sulfuric acid solution with a concentration of 5wt%-20wt%.

[0020] Furthermore, the passivation solution in the post-treatment tank is a dilute nitric acid solution with a concentration of 3wt%-8wt%, and a stirring device is also provided in the post-treatment tank to ensure the uniformity of the passivation solution.

[0021] Furthermore, the wire feed reel is equipped with a tension regulator and a power system. The tension regulator is an electromagnetic tension regulator, which is used to control the wire feed tension of the metal wire within the range of 10-50 Newtons. The power system is a variable frequency motor, and the output shaft of the variable frequency motor is connected to the middle part of the wire feed reel, which is used to adjust the metal wire transmission speed between 0.1-1 m / min.

[0022] Furthermore, the tank bodies of the etching tank, the pre-treatment tank and the post-treatment tank are all made of polypropylene or stainless steel, and a liquid level sensor is provided inside the tank body.

[0023] Furthermore, the cathode titanium basket is filled with graphite particles, and the particle size of the graphite particles is 0.5-5 mm, and the filling rate is 30%-70%.

[0024] Further, a pair of anode rollers are provided, and the anode rollers are used to guide the metal wire to enter and exit the etching area and provide anode current at the same time;

[0025] The surface of the anode roller is treated with anti-corrosion, and the material thereof is copper, and the anode roller is matched with a servo motor as a rotation drive source;

[0026] The pre-treatment tank, the etching tank and the post-treatment tank are all provided with limiting rollers made of non-conductive material, and the limiting rollers are used to limit the height and position of the metal wire in the corresponding tank body.

[0027] A second aspect of the present invention provides an electro-etching method using the above-mentioned device, comprising the following steps:

[0028] Wire pretreatment: The wire is drawn out from the wire coil, and the tension is adjusted to 10-50 Newtons by an electromagnetic tension regulator, and then enters the cleaning chamber of the pretreatment tank. In a sulfuric acid solution with a concentration of 5wt%-20wt%, it runs at a speed of 0.1-1 m / min, and an ultrasonic cleaning device is turned on for 1-5 minutes to remove the oxide layer and dirt on the surface of the wire, and then the wire enters the etching tank;

[0029] Electroetching: After the metal wire enters the etching tank, a closed circuit is formed between the anode and the cathode titanium basket, and the current density is adjusted to 10-50A / dm 2 The etching time is determined to be 0.5-3 minutes by controlling the conveying speed of the metal wire at 0.1-1 m / min. At the same time, the electrolyte in the etching tank is circulated through the liquid circulation port at the bottom or side, and the circulation flow rate is 5-20 L / min. During the etching process, a micro-nano structure is formed on the surface of the metal wire;

[0030] Post-processing steps: The etched metal wire enters the post-processing tank and is immersed in a dilute nitric acid solution with a concentration of 3wt%-8wt% for 1-3 minutes. The stirring device in the post-processing tank stirs at a speed of 50-150 rpm to ensure the uniformity of the passivation solution, passivate the surface of the metal wire, and enhance its corrosion resistance. Finally, the metal wire is collected by a wire reel, and the wire reel adopts a constant tension winding method.

[0031] A third aspect of the present invention provides a metal wire product prepared by the above-mentioned electro-etching method.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The present invention provides a device and method for continuous electrical etching of metal wires, which has significant advantages. First, the device realizes fully automated operation of the metal wire, and by integrating the control system of wire feeding, wire feeding and etching processes, it reduces manual intervention and operation complexity, and greatly improves production efficiency.

[0034] Secondly, the limiting roller and dynamic electrolyte circulation system in the design ensure the stability and uniformity of the metal wire during the etching process, avoiding the problem of uneven etching depth caused by uneven current distribution in traditional methods, so that the etched metal wire has a more consistent surface micro-nano structure and catalytic performance.

[0035] In addition, by adjusting the moving speed and current density of the metal wire, this device can flexibly control the etching depth and surface morphology to meet the requirements of metal wire performance in different application scenarios.

[0036] At the same time, the device adopts an innovative anode roller design, which can not only guide the continuous transmission of the metal wire, but also provide a stable anode current, significantly improving the reliability of the equipment and the efficiency of electrical etching. By reducing the subsequent processing of the finished wire mesh, the present invention effectively avoids the problem of reduced mechanical strength, simplifies the process flow, and reduces production costs.

[0037] Overall, this invention provides an efficient, stable, uniform and cost-controllable solution for the industrial production of high-performance metal wire, which has important application value and promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic structural diagram of the device for electro-etching a metal wire in the present invention;

[0039] In the figure: 1 is the wire feeding coil, 2 is the nickel wire, 3 is the pre-treatment tank, 4 is the etching tank, 5 is the post-treatment tank, and 6 is the wire receiving coil.

[0040] Figure 2 Schematic diagram of the etching groove structure.

[0041] 2-1 is the cathode copper bar, 2-2 is the anode copper bar, 2-3 is the cathode titanium basket, 4 is the etching tank, 2-5 is the liquid circulation port, 2-6 is the nickel wire, 2-7 is the anode roller, and 2-8 is the limit roller. DETAILED DESCRIPTION

[0042] On the whole, the equipment and process of the present invention are composed as follows:

[0043] 1. Equipment composition

[0044] (1) Etching groove

[0045] The etching tank is used to contain the electrolyte and provide a working environment for electro-etching. Its internal design needs to ensure the circulation uniformity of the electrolyte and the stability of the etching reaction. The tank body is made of corrosion-resistant materials such as polypropylene or stainless steel, and the inlet and outlet are arranged inside to maintain the dynamic flow of the electrolyte to ensure the uniformity of the etching process.

[0046] (2) Cathode titanium basket

[0047] The cathode titanium basket is suspended on both sides of the etching tank and electrically connected to the cathode copper busbar to participate in the electrochemical reaction as a cathode. Its design needs to ensure a large contact area and uniform distribution to improve the uniformity of current density. The interior of the titanium basket can be filled with conductive materials with a high surface area (such as graphite particles) to further enhance the reaction effect.

[0048] (3) Anode roller

[0049] The anode rollers are located at the front and rear ends of the etching tank and are installed on the anode copper bar to guide the metal wire into and out of the etching area and provide anode current. The rollers are made of highly conductive copper and their surfaces are treated with anti-corrosion to extend their service life. The anode rollers are designed to be rotatable and the speed of the metal wire is controlled by an external motor.

[0050] (4) Limit roller

[0051] The limit roller is made of non-conductive material and is installed inside the etching tank to adjust the height and position of the metal wire in the electrolyte to ensure that the metal wire remains stable during the etching process and avoids deviation. The position of the limit roller can be adjusted to accommodate metal wires of different specifications.

[0052] (5)Automation control system

[0053] The system integrates the fully automatic control modules of wire feeding, wire exiting and etching process, including motor drive module, current monitoring module and sensor system. The system can adjust the running speed, current density and etching time of the metal wire in real time to ensure processing efficiency and etching uniformity.

[0054] 2. Process

[0055] (1) Wire pretreatment

[0056] The metal wire needs to be cleaned and surface activated before etching to remove the surface oxide layer and dirt to ensure the uniformity of the electro-etching reaction. The cleaning process can be chemical pickling or ultrasonic cleaning.

[0057] (2) Wire introduction

[0058] The metal wire is guided into the etching groove from the anode roller at the front end of the equipment and its position is adjusted by the limit roller. The anode roller provides anode current and realizes continuous transmission of the metal wire through the rotating mechanism.

[0059] (3) Electroetching process

[0060] The metal wire acts as an anode between two anode rollers in the etching tank, and forms a closed circuit with the cathode titanium basket through the electrolyte.

[0061] The etching intensity is controlled by adjusting the anode current density; the etching depth is controlled by the etching time (determined by the metal wire transmission speed).

[0062] During the etching process, a large number of micro-nano structures will be formed on the surface of the metal wire, significantly improving its specific surface area and catalytic activity.

[0063] (4) Wire export

[0064] The etched metal wire is guided out by the rear anode roller and enters the wire collecting device, which can wind or flatten the metal wire according to actual needs.

[0065] (5) Electrolyte circulation

[0066] The electrolyte in the etching tank flows dynamically through a circulation system to avoid excessive local reactions or uneven solution concentrations. At the same time, the electrolyte is kept clean and the concentration is stable through filtering and refilling devices.

[0067] 3. Process parameters

[0068] (1) Current density

[0069] The current density is usually in the range of 10 to 50 A / dm 2 , the specific value depends on the material of the metal wire and the target etching depth.

[0070] (2) Etching time

[0071] The etching time is determined by the moving speed of the metal wire and is generally controlled between 0.5 and 3 minutes to ensure that the etching depth meets the design requirements.

[0072] (3) Electrolyte composition

[0073] The electrolyte formula is selected according to the material of the metal wire. For example, for nickel-based metal wire, an electrolyte containing nickel sulfate and sodium chloride can be selected to improve the etching efficiency and the uniformity of the surface microstructure.

[0074] (4) Temperature control

[0075] The electrolyte in the etching tank is maintained in the range of 20 to 80°C and is precisely controlled by the heating and cooling system to ensure the stability of the etching reaction.

[0076] The following is a detailed description of the method and equipment application of continuous electro-etching of metal wires by the present invention through specific embodiments. The equipment is designed as a continuous processing system including a pre-treatment tank, an etching tank and a post-treatment tank, equipped with a wire feeding and wire collecting device to achieve continuous transmission and automated operation of the metal wire. The component model, material name, connection structure, control method, algorithm and other features not clearly stated in this technical solution are regarded as common technical features disclosed in the prior art.

[0077] Example 1

[0078] The device for electro-etching a metal wire in this embodiment comprises a wire feed roll 1, a pre-treatment tank 3, an etching tank 4, a post-treatment tank 5, and a wire collection roll 6 arranged in sequence along the processing direction, wherein the specific Figure 1 and Figure 2 . Figure 1 It is a schematic diagram of the structure of the equipment used for electro-etching metal wire in the present invention; the figure includes a wire feed roll 1, a nickel wire 2, a pre-treatment tank 3, an etching tank 4, a post-treatment tank 5, and a wire collection roll 6. Figure 2 The structure diagram of the etching tank includes: cathode copper bar 2-1, anode copper bar 2-2, cathode titanium basket 2-3, etching tank 4, liquid circulation port 2-5, nickel wire 2-6, anode roller 2-7, and limit roller 2-8.

[0079] The pretreatment tank 3, etching tank 4 and post-treatment tank 5 all include a tank body, a cathode copper bar and an anode copper bar arranged on the tank body, a cathode titanium basket arranged in the tank body, and an anode roller arranged in the tank body, wherein the cathode titanium basket is connected to the cathode copper bar, and the anode roller is connected to the anode copper bar. The tank body of the pretreatment tank 3 is also provided with a cleaning chamber for accommodating metal wires and containing a chemical pickling solution and an ultrasonic cleaning gas, which is used to remove oxide layers and dirt on the surface of the metal wires. The tank body of the etching tank 4 is also provided with an electrolyte circulation system, which is used to maintain the dynamic flow, cleanliness and stable concentration of the electrolyte; the tank body of the post-treatment tank 5 is provided with a passivation solution for passivating the etched metal wires.

[0080] Two liquid circulation ports are provided on the etching tank 4, and an electrolyte circulation system is also provided on the etching tank 4, and the electrolyte circulation system includes a filtering device, a fluid replenishing device, and an electrolyte storage container; the liquid circulation port is arranged at the bottom or side of the tank body; the filtering device is a filter-type filter; the liquid circulation port includes an electrolyte inlet and an electrolyte outlet, the electrolyte inlet is connected to the outlet of the filtering device through a first pipeline, the inlet of the filtering device is connected to the outlet of the fluid replenishing device through a second pipeline, and the inlet of the fluid replenishing device is connected to the electrolyte storage container; the electrolyte outlet is connected to the electrolyte storage container for collecting the discharged electrolyte; the fluid replenishing device is a fluid replenishing pump.

[0081] The chemical pickling solution in the pretreatment tank 3 is a sulfuric acid solution with a concentration of 5wt%-20wt%. The passivation solution in the post-treatment tank 5 is a dilute nitric acid solution with a concentration of 3wt%-8wt%, and a stirring device is also provided in the post-treatment tank 5 to ensure the uniformity of the passivation solution.

[0082] The wire feed reel 1 is equipped with a tension regulator and a power system. The tension regulator is an electromagnetic tension regulator, which is used to control the wire feed tension of the metal wire within the range of 10-50 Newtons. The power system is a variable frequency motor, and the output shaft of the variable frequency motor is connected to the middle part of the wire feed reel 1, which is used to adjust the metal wire transmission speed between 0.1-1 m / min.

[0083] The tank bodies of the etching tank 4, the pre-treatment tank 3 and the post-treatment tank 5 are all made of polypropylene or stainless steel, and liquid level sensors are arranged inside the tank bodies.

[0084] The cathode titanium basket is filled with graphite particles, the particle size of the graphite particles is 0.5-5 mm, and the filling rate is 30%-70%.

[0085] A pair of anode rollers are provided, which are used to guide the metal wire to enter and exit the etching area and provide anode current at the same time; the surface of the anode roller is treated with anti-corrosion, and the material is copper, and the anode roller is matched with a servo motor as a rotation drive source.

[0086] The pre-treatment tank 3, the etching tank 4 and the post-treatment tank 5 are all provided with limiting rollers made of non-conductive material, and the limiting rollers are used to limit the height and position of the metal wire in the corresponding tank body.

[0087] The specific implementation equipment consists of:

[0088] 1. Etching groove:

[0089] Dimensions: Length 600mm, width 500mm, height 500mm.

[0090] Material: Polypropylene.

[0091] Function: To complete the surface electroetching of metal wire.

[0092] Configuration:

[0093] Anode roller: Set at the front and rear ends of the slot to guide the metal wire into and out of the etching area. The roller has a diameter of 50mm, is made of tinned copper, and rotates passively to ensure full contact with the metal wire and transfer the anode current.

[0094] Cathode titanium basket: It is set on both sides of the tank and connected to the cathode copper bar to form a closed circuit. The titanium basket is filled with graphite particles to improve the uniformity of current distribution.

[0095] Limit roller: Made of corrosion-resistant ceramic material, it is set in the etching groove to adjust the height and position of the metal wire in the electrolyte to ensure the stability of the etching process.

[0096] 2. Pretreatment tank: size, material, function and configuration are the same as the etching tank

[0097] 3. Post-processing tank: size, material, function and configuration are the same as the etching tank

[0098] 4. Wire feeding and wire collecting device:

[0099] The wire feeding device is equipped with a tension regulator and a power system to stably feed the metal wire into the pretreatment tank.

[0100] The wire collection device is equipped with a winding system and a speed control module to collect the processed wire and keep the tension uniform.

[0101] 5. Electrolyte circulation system:

[0102] Each tank is independently equipped with a dynamic circulation device, including filtration, liquid replenishment and heating modules to ensure the stability of solution concentration and temperature. The liquid temperature control range is 25-45°C.

[0103] Example 2

[0104] This embodiment provides an electro-etching method using the above-mentioned device, comprising the following steps:

[0105] Wire pretreatment: The wire is led out from the wire feed reel 1, and the tension is adjusted to 10-50 Newtons by an electromagnetic tension regulator, and then enters the cleaning chamber of the pretreatment tank 3, and runs at a speed of 0.1-1 m / min in a sulfuric acid solution with a concentration of 5wt%-20wt%. At the same time, an ultrasonic cleaning device is turned on for 1-5 minutes to remove the oxide layer and dirt on the surface of the wire, and then the wire enters the etching tank 4;

[0106] Electroetching: After the metal wire enters the etching tank 4, a closed circuit is formed between the anode and the cathode titanium basket, and the current density is adjusted to 10-50A / dm 2 , the etching time is determined to be 0.5-3 minutes by controlling the conveying speed of the metal wire to be 0.1-1 m / min, and the electrolyte in the etching tank 4 is circulated through the liquid circulation port at the bottom or side, and the circulation flow rate is 5-20 L / min, and a micro-nano structure is formed on the surface of the metal wire during the etching process;

[0107] Post-processing steps: the etched metal wire enters the post-processing tank 5 and is immersed in a dilute nitric acid solution with a concentration of 3wt%-8wt% for 1-3 minutes. The stirring device in the post-processing tank 5 stirs at a speed of 50-150 rpm to ensure the uniformity of the passivation solution, passivate the surface of the metal wire, and enhance its corrosion resistance. Finally, the metal wire is collected by the wire reel 6, and the wire reel 6 adopts a constant tension winding method.

[0108] The specific process is as follows:

[0109] 1. Preprocessing stage:

[0110] The metal wire is introduced into the pretreatment tank from the wire feeding device. The pretreatment solution is composed of dilute sulfuric acid (concentration 10%) and deionized water, which is used to remove the oxide layer and oil stains on the surface of the metal wire. The metal wire is immersed in the tank for about 30 seconds, and a slight current is applied to the electrolyte (current density is about 5A / dm 2 ), further improving the cleaning efficiency. The cleaned metal wire directly enters the etching tank through the anode roller at the rear end of the pretreatment tank.

[0111] 2. Etching stage:

[0112] The metal wire is introduced into the etching tank by the front anode roller, and the height is adjusted by the limit roller to ensure stable operation in the etching tank. The metal wire acts as an anode in the etching tank and forms a circuit with the cathode titanium baskets on both sides through the electrolyte. The electrolyte is a mixture of nickel sulfate (NiSO4·6H2O, 150g / L) and sodium chloride (NaCl, 50g / L). The temperature is maintained at 35°C and the current density is set to 20A / dm 2 The etching time is controlled by the transmission speed of the metal wire, which is generally 30 to 60 seconds. After the etching is completed, the metal wire is introduced into the post-processing tank through the rear anode roller.

[0113] 3. Post-processing stage:

[0114] The etched metal wire directly enters the post-processing tank. The post-processing solution is dilute nitric acid (concentration 5%) or other suitable passivation solution, which is used to remove surface impurities remaining during the etching process and passivate the surface of the metal wire to enhance its corrosion resistance. After the metal wire is immersed in the post-processing tank for 20 to 30 seconds, it is passed out through the rear roller and enters the wire collection device.

[0115] 4. Silk collection stage:

[0116] The post-processed metal wire is wound by a wire collection device, which is equipped with a tension control module to ensure that the metal wire maintains uniform tension during the winding process to avoid pulling damage.

[0117] 5. Electrolyte circulation:

[0118] The liquids in the pre-treatment tank, etching tank and post-treatment tank flow dynamically through independent circulation systems. Each circulation system includes a filter device (to remove particulate impurities), a liquid replenishment device (to maintain liquid concentration) and a temperature control device (to maintain reaction temperature) to ensure the stability of the treatment liquid at each stage.

[0119] This embodiment also provides a metal wire product prepared by the above-mentioned electro-etching method. Its surface forms a uniform and rich micro-nano structure through a precisely controlled electro-etching process, which greatly increases the specific surface area and significantly enhances the catalytic activity. In the entire preparation process, each link is closely linked, from the pretreatment of the metal wire to the electro-etching and then to the post-treatment, ensuring that the product not only has good chemical properties, but also effectively maintains mechanical strength, avoiding the problem of strength reduction caused by the processing technology, so that the metal wire product shows excellent application potential and market competitiveness in many fields such as water electrolysis and battery current collector.

[0120] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A device for electro-etching a metal wire, characterized in that: It comprises a wire feeding reel (1), a pre-treatment tank (3), an etching tank (4), a post-treatment tank (5), and a wire collecting reel (6) which are sequentially arranged along a processing direction; The pretreatment tank (3), etching tank (4), and post-treatment tank (5) all comprise a tank body, a cathode copper bar and an anode copper bar arranged on the tank body, a cathode titanium basket arranged in the tank body, and an anode roller arranged in the tank body, wherein the cathode titanium basket is connected to the cathode copper bar, and the anode roller is connected to the anode copper bar; The pretreatment tank (3) is also provided with a cleaning chamber inside the tank body for accommodating the metal wire and containing a chemical pickling solution and an ultrasonic cleaning gas, so as to remove the oxide layer and dirt on the surface of the metal wire; An electrolyte circulation system is also provided inside the etching tank (4), and the electrolyte circulation system is used to maintain the dynamic flow, cleanliness and stable concentration of the electrolyte; A passivation solution for passivating the etched metal wire is arranged inside the tank body of the post-processing tank (5).

2. The device for electro-etching a metal wire according to claim 1, characterized in that: The etching tank (4) is provided with two liquid circulation ports, and the etching tank (4) is also provided with an electrolyte circulation system, wherein the electrolyte circulation system comprises a filtering device, a liquid replenishing device, and an electrolyte storage container; The liquid circulation port is arranged at the bottom or side of the tank body; The filtering device is a screen filter; The liquid circulation port includes an electrolyte inlet and an electrolyte outlet, the electrolyte inlet is connected to the outlet of the filter device through a first pipeline, the inlet of the filter device is connected to the outlet of the liquid replenishing device through a second pipeline, and the liquid inlet of the liquid replenishing device is connected to the electrolyte storage container; The electrolyte outlet is connected to the electrolyte storage container and is used to collect the discharged electrolyte; The fluid infusion device is a fluid infusion pump.

3. The device for electro-etching a metal wire according to claim 1, characterized in that: The chemical pickling solution in the pretreatment tank (3) is a sulfuric acid solution with a concentration of 5wt%-20wt%.

4. The device for electro-etching a metal wire according to claim 1, characterized in that: The passivation solution in the post-treatment tank (5) is a dilute nitric acid solution with a concentration of 3wt%-8wt%, and a stirring device is also provided in the post-treatment tank (5) to ensure the uniformity of the passivation solution.

5. The device for electro-etching a metal wire according to claim 1, characterized in that: The wire feed reel (1) is equipped with a tension regulator and a power system. The tension regulator is an electromagnetic tension regulator, which is used to control the wire feed tension of the metal wire within the range of 10-50 Newtons. The power system is a variable frequency motor, and the output shaft of the variable frequency motor is connected to the middle part of the wire feed reel (1) to adjust the metal wire transmission speed between 0.1-1 m / min.

6. The device for electro-etching a metal wire according to claim 1, characterized in that: The tank bodies of the etching tank (4), the pre-treatment tank (3) and the post-treatment tank (5) are all made of polypropylene or stainless steel, and liquid level sensors are arranged inside the tank bodies.

7. The device for electro-etching a metal wire according to claim 1, characterized in that: The cathode titanium basket is filled with graphite particles, the particle size of the graphite particles is 0.5-5 mm, and the filling rate is 30%-70%.

8. The device for electro-etching a metal wire according to claim 1, characterized in that: A pair of anode rollers are provided, and the anode rollers are used to guide the metal wire to enter and exit the etching area and provide anode current at the same time; The surface of the anode roller is treated with anti-corrosion, and the material thereof is copper, and the anode roller is matched with a servo motor as a rotation drive source; The pre-treatment tank (3), the etching tank (4) and the post-treatment tank (5) are all provided with limiting rollers made of non-conductive material, and the limiting rollers are used to limit the height and position of the metal wire in the corresponding tank body.

9. An electro-etching method using the apparatus as claimed in any one of claims 1 to 8, characterized in that: The following steps are involved: Pretreatment of the metal wire: The metal wire is led out from the wire feed roll (1), the tension of which is adjusted to 10-50 Newtons by an electromagnetic tension regulator, and then enters the cleaning chamber of the pretreatment tank (3), and runs at a speed of 0.1-1 m / min in a sulfuric acid solution with a concentration of 5wt%-20wt%. At the same time, an ultrasonic cleaning device is turned on for 1-5 minutes to remove the oxide layer and dirt on the surface of the metal wire, and then the metal wire enters the etching tank (4); Electroetching: After the metal wire enters the etching tank (4), a closed circuit is formed between the anode and the cathode titanium basket, and the current density is adjusted to 10-50A / dm 2 , the etching time is determined to be 0.5-3 minutes by controlling the conveying speed of the metal wire to be 0.1-1 m / min, and the electrolyte in the etching tank (4) is circulated through the liquid circulation port at the bottom or side, and the circulation flow rate is 5-20 L / min, and a micro-nano structure is formed on the surface of the metal wire during the etching process; Post-processing steps: the etched metal wire enters the post-processing tank (5) and is immersed in a dilute nitric acid solution with a concentration of 3wt%-8wt% for 1-3 minutes. The stirring device in the post-processing tank (5) stirs at a speed of 50-150 rpm to ensure the uniformity of the passivation solution, passivates the surface of the metal wire, and enhances its corrosion resistance. Finally, the metal wire is collected by a wire reel (6), and the wire reel (6) adopts a constant tension winding method.

10. A metal wire product prepared by the electro-etching method as claimed in claim 9.

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