Anodizing apparatus and method suitable for metal strands

Abstract

This application relates to an anodizing apparatus and method for metal stranded wires, which can solve the problem in related technologies that it is difficult to construct a uniformly distributed porous oxide film on the surface of aluminum stranded wires using anodizing methods for overhead power transmission lines. The anodizing apparatus includes a container and a cathode structure. The container contains an electrolyte and is used to hold the metal stranded wire workpiece. The cathode structure is immersed in the electrolyte and has a hollow ring shape. The cathode structure is used to be fitted onto the metal stranded wire workpiece contained in the container, and the cathode structure is coaxially arranged with the metal stranded wire workpiece. The cathode structure is used to undergo an anodizing reaction with the metal stranded wire workpiece.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrochemical treatment of power transmission conductor surface, in particular to an anodizing device and method suitable for metal strand. BACKGROUND

[0002] With the large-scale construction and operation of high-voltage and ultra-high-voltage power transmission projects with large capacity and long distance, the power transmission corridor inevitably passes through areas with low temperature, high humidity, and frequent rain, snow and freezing, and the frequency and influence range of icing accidents of power transmission lines are on the rise, which seriously threatens the safe operation of power grids, so a series of icing control measures have emerged.

[0003] In related technologies, icing control measures can be generally divided into two types, namely deicing technology and anti-icing technology. Among them, deicing technology mainly includes mechanical deicing and high-current deicing, mechanical deicing relies on artificial or mechanical vibration to remove ice layer, which has problems such as low efficiency and high operation risk; although high-current deicing has high deicing efficiency, it usually needs to suspend power supply during implementation, which is easy to affect normal power use of residents and industries and increase operation and maintenance costs.

[0004] Therefore, anti-icing technology is generally used for icing control in related technologies. Anti-icing technology mainly inhibits or slows down the formation and accumulation of ice layer on the material surface by preparing micro / nano structure or functional coating on the material surface. Among them, the method of anodizing is mainly used for preparing micro / nano structure on the material surface.

[0005] However, overhead power transmission conductors are generally composed of multiple layers of aluminum monofilament spirally twisted, and have a relatively complex surface topography, so the anodizing method for overhead power transmission conductors in related technologies is difficult to construct uniformly distributed porous oxide film on the surface of aluminum strand. SUMMARY

[0006] Therefore, it is necessary to provide an anodizing device and method to solve the problem that the anodizing method for overhead power transmission conductors in related technologies is difficult to construct uniformly distributed porous oxide film on the surface of aluminum strand.

[0007] In one aspect, the present application provides an anodizing device suitable for metal strand, which comprises:

[0008] a container containing an electrolyte, the container being used for containing a metal strand workpiece;

[0009] A cathode structure is immersed in the electrolyte. The cathode structure is in the shape of a hollow ring and is used to be fitted onto the metal stranded wire workpiece contained in the container. The cathode structure is arranged coaxially with the metal stranded wire workpiece and is used to undergo an anodic oxidation reaction with the metal stranded wire workpiece.

[0010] In one embodiment, the anodizing apparatus further includes a base disposed within the container for fixing the cathode structure.

[0011] In one embodiment, the cathode structure and / or the container are connected to a positioning mechanism for supporting the stranded metal workpiece and keeping the cathode structure and the stranded metal workpiece coaxially arranged.

[0012] In one embodiment, the anodizing apparatus further includes a drive mechanism for moving the stranded metal workpiece along the axial direction of the cathode structure.

[0013] In one embodiment, the cathode structure has a plurality of perforations extending through its circumferential surface.

[0014] In one embodiment, the radial diameter of the cathode structure is 180mm-250mm.

[0015] In one embodiment, the metal stranded workpiece is configured as an aluminum stranded workpiece; and / or, the cathode structure is made of titanium metal; and / or, the electrolyte is configured as a phosphoric acid solution.

[0016] On the other hand, this application provides an anodizing method suitable for metal stranded wires, comprising the following steps:

[0017] Provides an anodizing apparatus as described above, and stranded metal workpieces;

[0018] The metal stranded wire workpiece is subjected to alkaline washing;

[0019] The metal stranded wire workpiece after alkaline washing is then cleaned and dried.

[0020] The dried metal stranded wire workpiece is threaded through the cathode structure, with the threaded portion of the metal stranded wire workpiece arranged coaxially with the cathode structure, so that the metal stranded wire workpiece and the cathode structure undergo an anodic oxidation reaction.

[0021] In one embodiment, the method further includes the step of moving the metal stranded workpiece along the axial direction of the cathode structure at a preset rate until the circumferential surface of the metal stranded workpiece undergoes an anodic oxidation reaction with the cathode structure.

[0022] In one embodiment, the steps further include: cleaning, vacuum impregnating and drying the metal stranded workpiece after the reaction is completed.

[0023] The above-mentioned anodizing apparatus and method for metal stranded wire provided in this application, with a hollow ring-shaped cathode structure and coaxial arrangement of the cathode structure and the metal stranded wire workpiece, helps to improve the uniformity of the circumferential current density distribution of the metal stranded wire workpiece, which serves as the anode structure, during the reaction process, and thus helps to improve the uniformity of the distribution of the porous oxide film formed on the surface of the metal stranded wire workpiece. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an anodizing apparatus for metal strands in one embodiment of this application.

[0025] Figure 2 for Figure 1 The diagram shows a partial structural schematic of the anodizing apparatus.

[0026] Figure 3 This is a schematic flowchart of an anodizing method for metal stranded wires according to an embodiment of this application.

[0027] Explanation of icon numbers 10. Anodizing device; 20. Metal stranded wire workpiece; 100. Container; 200. Cathode structure; 210. Perforation; 300. Base; 400. Positioning mechanism. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0034] Please see Figure 1 and Figure 2This application provides an anodizing apparatus 10 suitable for metal stranded wires. The anodizing apparatus 10 may include a container 100 and a cathode structure 200. The container 100 contains an electrolyte and is used to hold a metal stranded wire workpiece 20. The cathode structure 200 is immersed in the electrolyte and is in the shape of a hollow ring. The cathode structure 200 is used to be fitted onto the metal stranded wire workpiece 20 contained in the container 100, and the cathode structure 200 and the metal stranded wire workpiece 20 are arranged coaxially. The cathode structure 200 is used to undergo an anodizing reaction with the metal stranded wire workpiece 20.

[0035] Specifically, the principle of the aforementioned cathode structure 200 for anodic oxidation reaction with the metal stranded wire workpiece 20 is that the metal stranded wire workpiece 20 is placed in the electrolyte as the anode, and a porous oxide film is grown on the surface of the metal stranded wire workpiece 20 under the action of an applied electric field and the electrolyte. Furthermore, the metal stranded wire workpiece 20 is generally composed of multiple layers of metal monofilaments spirally twisted together.

[0036] Please see Figure 3 Correspondingly, this application also provides an anodizing method suitable for metal stranded wires, which may include the following steps:

[0037] S100 provides an anodizing apparatus 10 as described above and a stranded metal workpiece 20.

[0038] S200, Alkali washing is performed on the metal stranded wire workpiece 20.

[0039] S300: Clean and dry the metal stranded wire workpiece 20 after alkaline washing.

[0040] S400. The dried metal stranded wire workpiece 20 is threaded through the cathode structure 200, and the threaded part of the metal stranded wire workpiece 20 is arranged coaxially with the cathode structure 200, so that the metal stranded wire workpiece 20 and the cathode structure 200 undergo an anodic oxidation reaction.

[0041] S500: Clean, vacuum impregnate and dry the metal stranded workpiece 20 after the reaction is completed.

[0042] The above-mentioned anodizing apparatus 10 and method for metal stranded wire provided in this application, by having a hollow ring shape for the cathode structure 200 and coaxial arrangement of the cathode structure 200 and the metal stranded wire workpiece 20, helps to improve the uniformity of the circumferential current density distribution of the metal stranded wire workpiece 20, which serves as the anode structure, during the reaction process, and further helps to improve the uniformity of the distribution of the porous oxide film formed on the surface of the metal stranded wire workpiece 20.

[0043] The anodizing device 10 and method provided in this application construct micro / nano-scale rough structures in situ on the material surface of the metal stranded workpiece 20 through the principle of anodizing reaction. This allows for subsequent modification with low surface energy materials, making the surface superhydrophobic. The superhydrophobic surface can not only reduce the contact area and time between droplets and the surface, but also prolong the freezing time of droplets and reduce the ice adhesion strength, thereby achieving the anti-icing and de-icing effect of the metal stranded workpiece 20. It has good application potential in the treatment of icing on power transmission lines.

[0044] It is also worth noting that, under the premise of meeting the requirement of uniform distribution of circumferential current density on the surface of the metal stranded workpiece 20, the anodizing device 10 and method provided by the present invention also have certain advantages in terms of cathode material consumption, space requirements and electrolyte usage. For example, compared with the plate cathode structure, the annular cathode structure 200 is more compatible with the appearance of the metal stranded workpiece 20. Therefore, even with a small radial distance between the metal stranded workpiece 20 and the annular cathode structure 200, the current density can still be uniformly distributed, which helps to reduce the required volume of the cathode structure 200 and the volume of electrolyte used, thus saving costs.

[0045] For example, the inventors also conducted the following experiments regarding the above-mentioned anodizing method applicable to metal stranded workpiece 20.

[0046] First, we select the experimental materials.

[0047] The aforementioned metal stranded wire workpiece 20 of this application may, but is not limited to, use aluminum-clad steel-core aluminum stranded wire from 220kV overhead lines. Specifically, the aluminum-clad steel-core aluminum stranded wire from 220kV overhead lines may adopt a "24+7" stranding structure, with an outer layer of 24 aluminum monofilaments with a diameter of 3.6mm and an inner layer of 7 aluminum-clad steel cores with a diameter of 2.4mm, for a total diameter of 21.6mm. The electrolyte for anodizing may, but is not limited to, a 0.3mol / L phosphoric acid (H3PO4) solution. The alkaline washing solution may, but is not limited to, a 1mol / L NaOH solution. The cleaning method may, but is not limited to, ultrasonic cleaning with deionized water. The drying method may, but is not limited to, drying in a forced-air drying oven. The impregnation solution may, but is not limited to, a 10wt.% heptadecafluorodecyltriethoxysilane (FAS-17)-ethanol solution.

[0048] Next, the experimental materials were pretreated.

[0049] Twenty samples of 500mm long stranded metal wire were cut and immersed in a 1mol / L NaOH solution for 5 minutes to remove surface oil and natural oxide layer. The samples were then removed and ultrasonically cleaned in deionized water for 10 minutes to remove residual NaOH solution and reaction products. Finally, the samples were dried in a forced-air drying oven at 90℃ for 1 hour for later use.

[0050] The above samples were then anodized.

[0051] The pretreated sample was sealed and bound at both ends with PTFE tape, ensuring an effective contact length with the electrolyte of 400 mm. It was then placed in container 100 for anodizing, with the power supply set to constant current mode, controllable within the range of 0.092 A / cm². 2 —0.166A / cm 2 The oxidation time range is 5 min to 30 min. To ensure the stability of the reaction rate, the electrolyte temperature is controlled at 15℃ through a cold water circulation system, and the temperature fluctuation range during the reaction process is less than 2℃.

[0052] Finally, the above samples were modified with low surface energy.

[0053] After anodizing, the sample was removed and placed in an ultrasonic cleaner for 15 minutes to remove residual electrolyte from its surface. Subsequently, the cleaned sample was dried at 90°C for 1 hour, then immersed in a 10 wt.% heptadecafluorodecyltriethoxysilane (FAS-17)-ethanol solution under vacuum for 6 hours. Finally, the sample was removed and dried in a 110°C forced-air drying oven for 1 hour.

[0054] Through the aforementioned experiments, the inventors discovered that the metal stranded workpiece 20 treated with the anodizing method provided in this application helps to improve the uniformity of the distribution of the porous oxide film formed on the surface of the metal stranded workpiece 20. It is worth noting that the analysis of the uniformity of the distribution of the porous oxide film formed on the surface of the metal stranded workpiece 20 can be, but is not limited to, using a scanning electron microscope to capture an image of the nanopore structure morphology on the surface of the metal stranded workpiece 20, and then analyzing this structural morphology image. Specifically, the process of analyzing this structural morphology image is as follows.

[0055] First, the original electron microscope image can be denoised, and then an adaptive thresholding algorithm can be used for binarization segmentation to extract the irregular nanopore structures into independent pixel regions. Since the nanopore structures on the surface of the metal stranded wire workpiece 20 are irregular polygons of varying sizes, they can be approximated as circles. Aperture analysis can be performed by statistically analyzing the area of ​​individual pores to calculate their equivalent diameter (after removing the 10% of invalid pore areas). The average value of all effective pore structures within the field of view of the electron microscope image is then used as the analysis metric. In the formula The average diameter of the nanopore structure on the surface of the aluminum stranded wire is given in nm; N is the number of nanopores; and Si is the area of ​​a single nanopore in nm. 2 Next, calculate the porosity, which is the ratio of the area of ​​nanopores in the scanning electron microscope image to the total area. The calculation method is as follows: In the formula, P is the porosity (in %), and Si is the area of ​​a single nanopore (in nm). 2 S represents the area within the field of view of the electron microscope scan, in nm. 2 .

[0056] Optionally, for cross-sectional morphology, three measurement points can be randomly selected in the oxide film growth direction to measure the film thickness, and the average value can be taken as the oxide film thickness on the surface of the metal stranded workpiece 20.

[0057] In some embodiments, the anodizing method provided in this application may further include the step of testing the wettability and anti-icing performance of the metal stranded workpiece 20.

[0058] The tests for wettability and anti-icing performance may include, but are not limited to, static water droplet contact angle and contact angle hysteresis tests, ice adhesion strength tests, water droplet bouncing tests, natural environment icing experiments, and laboratory extreme frost icing experiments.

[0059] In some embodiments, to better evaluate the uniformity of the porous oxide film on the surface of the anodized metal stranded workpiece 20, the anodizing method provided in this application further includes the following steps:

[0060] The step of "passing the dried metal stranded wire workpiece 20 through the cathode structure 200, keeping the passing portion of the metal stranded wire workpiece 20 coaxial with the cathode structure 200, so that the metal stranded wire workpiece 20 and the cathode structure 200 undergo an anodic oxidation reaction" further includes the step of evaluating the circumferential current density distribution uniformity of the metal stranded wire workpiece 20. The uniformity evaluation includes the following steps:

[0061] Samples were taken from the cross-sectional directions of the metal stranded wire workpiece 20 on sides P1, P2, P3, and P4, respectively, where sides P1, P2, P3, and P4 are located at 0°, 90°, 180°, and 270° along the circumferential direction of the cross-section of the metal stranded wire workpiece 20. Understandably, sides P1 and P3 are located along the diameter of the circular cross-section, and sides P2 and P4 are also located along the diameter of the circular cross-section.

[0062] The ratio of the average current density on the P2 side to that on the P1 side, JP2 / JP1, is taken as the evaluation index. The uniformity evaluation result is configured as follows: when JP2 / JP1 is closer to 1, the difference in current density in the circumferential direction of the metal stranded wire workpiece 20 is smaller, and the current density distribution is more uniform.

[0063] Specifically, in this embodiment, the ratio of the average current density on the P2 side to the P1 side, JP2 / JP1, is taken as an evaluation index, which helps to improve the simplicity and standardization of the evaluation of the uniformity of the porous oxide film on the surface of the anodized metal stranded workpiece 20.

[0064] In some embodiments, the anodizing method provided in this application may further include the following steps:

[0065] By combining the theoretical model of the growth of the porous structure of the anodic oxide on the surface of the metal stranded workpiece 20 with the Butler-Volmer electrode kinetic model describing the electrode / electrolyte interface, the relationship between the growth rate of the porous oxide film and the macroscopic current density on the surface of the metal stranded workpiece 20 is derived.

[0066] By simplifying the model building, the anodic oxidation chemical reaction process, and the boundary condition settings, an electric field coupling model of "anodine-cathode-electrolyte" is established.

[0067] It is worth noting that during the anodizing process of aluminum stranded wire, charge transfer mainly occurs between the electrolyte and electrode interfaces: current is injected into the anode from an external power source, then flows through the anode / electrolyte interface to the cathode plate, and finally flows back to the power source to form a loop. Therefore, this simulation can be simplified into a physical field model that satisfies Ohm's law, the principle of current conservation, and electrode reaction kinetics.

[0068] To facilitate the analysis of the distribution characteristics of axial and circumferential current densities on the anode surface, the circumferential current density and interface overpotential distribution can be extracted along the clockwise boundary of the anode surface in the above physical field model. This helps to simplify the evaluation of the uniformity of the porous oxide film on the surface of the anodized metal stranded workpiece 20.

[0069] It is worth noting that the above embodiments of this application help overcome the difficulties of complex and variable climate conditions in actual natural environments, the difficulty in accurately simulating icy climate environments in laboratories, and the lack of research on the performance verification of superhydrophobic surfaces in natural environments, thus improving the convenience of research.

[0070] In some embodiments, before step S500 of "cleaning, vacuum impregnating and drying the metal stranded workpiece 20 after the reaction is completed", the following step is also included:

[0071] The metal stranded wire workpiece 20 is moved along the axial direction of the cathode structure 200 at a preset rate until the circumferential surface of the metal stranded wire workpiece 200 undergoes an anodic oxidation reaction with the cathode structure 200.

[0072] Specifically, considering that the anodizing process of the anti-icing metal stranded workpiece 20 requires the preparation of a longer metal stranded workpiece 20, a step-by-step continuous preparation method will be adopted, that is, the metal stranded workpiece 20 passes through the electrolyte at a certain preset speed for anodizing. This means that the length of the metal stranded workpiece 20 will extend outward beyond the sleeve area of ​​the cathode structure 200.

[0073] It is worth noting that if the entire length of the stranded metal workpiece 20 is concentrated inside the electrolyte and within the cathode structure 200, the current at the geometric cut-off points at both ends of the stranded metal workpiece 20 will be distorted. This will result in a large current density accumulation, thereby reducing the uniformity of the porous oxide film on the surface of the anodized stranded metal workpiece 20. According to the above embodiments of this application, a step-by-step continuous preparation method is adopted, meaning the stranded metal workpiece 20 passes through the electrolyte at a predetermined speed for anodizing. In other words, the length of the stranded metal workpiece 20 extends beyond the interface of the cathode structure 200. This helps to achieve a uniform distribution of the axial current on the surface of the stranded metal workpiece 20 and eliminates the current density distortion at both ends, thereby improving the uniformity of the porous oxide film distribution on the surface of the stranded metal workpiece 20.

[0074] In some embodiments, the anodizing apparatus 10 may further include a drive mechanism (not deployed) for driving the metal stranded workpiece 20 to move axially along the cathode structure 200, thereby enabling the automated generation of a porous oxide film on the surface of the metal stranded workpiece 20 and improving the processing efficiency of the metal stranded workpiece 20.

[0075] In some embodiments, the cathode structure 200 and / or container 100 are connected to a positioning mechanism 400, which supports the aluminum stranded wire and maintains the coaxial arrangement of the cathode structure 200 and the metal stranded wire workpiece 20 to maintain the uniformity of the distribution of the porous oxide film formed on the surface of the metal stranded wire workpiece 20. It is worth noting that the positioning mechanism 400 is also used to maintain the coaxiality of the metal stranded wire workpiece 20 and the cathode structure 200 during the axial movement of the metal stranded wire workpiece 20 along the cathode structure 200.

[0076] Optionally, the positioning mechanism 400 described above in this application may be implemented as, but is not limited to, a positioning rod or the like. Of course, in some embodiments, the positioning mechanism 400 may be disposed on the cathode structure 200, which helps to improve the positional stability of the positioning mechanism 400 relative to the cathode structure 200, and thus helps to improve the accuracy of the coaxiality setting between the metal stranded wire workpiece 20 and the cathode structure 200.

[0077] In some embodiments, the anodizing apparatus 10 provided in this application may further include a base 300 disposed within the container 100. The base 300 is used to fix the cathode structure 200, which helps to improve the stability of the cathode structure 200.

[0078] In some embodiments, the cathode structure 200 is provided with a plurality of perforations 210 extending through its circumferential surface, which helps to optimize electrolyte flow and mass transfer efficiency while also accommodating bubble discharge, thereby improving the occurrence of the anodic oxidation reaction.

[0079] In some embodiments, the radial diameter of the cathode structure 200 can be 180mm-250mm, which helps to adapt to most metal stranded workpieces 20 in commercial applications and improves the applicability of the anodizing apparatus of this application. For example, the radial diameter of the cathode structure 200 can be, but is not limited to, 180mm, 190mm, 200mm, 210mm, 220mm, 230mm, 240mm or 250mm, etc.

[0080] In some embodiments, the metal stranded workpiece 20 described above may be configured as an aluminum stranded workpiece; and / or, the cathode structure 200 may be made of titanium metal material; and / or, the electrolyte may be configured as a phosphoric acid solution.

[0081] It is worth noting that overhead transmission lines are generally made of multiple layers of aluminum monofilaments spirally stranded, thus resulting in a relatively complex surface morphology. The metal stranded workpiece 20 described in this application can, but is not limited to, be configured as an aluminum stranded workpiece; and / or, the cathode structure 200 can, but is not limited to, be made of titanium metal; and / or, the electrolyte can, but is not limited to, be configured as a phosphoric acid solution. This helps to improve the application of the anodizing device 10 described in this application in the field of overhead transmission lines and enhances its application potential in the treatment of icing on transmission lines.

[0082] Finally, it should be noted that the anodizing apparatus and method for metal stranded wires described above can also be applied, but not limited to, the anodizing of overhead transmission lines. Other applications requiring anodizing of metal materials can also be achieved by modifying the anodizing apparatus and method described above, which will not be elaborated further here. Additionally, it should be noted that the cathode structure provided in this application is in the shape of a hollow ring, primarily to accommodate cases where the metal stranded wire workpiece has a cylindrical shape and a circular cross-section. Of course, when other workpieces are configured as plates or other cross-sectional shapes, the cathode structure of this application can be adaptively modified into corresponding plate or other cross-sectional shapes to improve its compatibility with the workpiece's appearance, thereby improving the uniformity of the porous oxide film distribution on the workpiece surface.

[0083] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0084] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An anodizing apparatus for metal stranded wires, characterized in that, The anodizing apparatus includes: A container containing an electrolyte, the container being used to hold a stranded metal workpiece; A cathode structure is immersed in the electrolyte. The cathode structure is in the shape of a hollow ring and is used to be fitted onto the metal stranded wire workpiece contained in the container. The cathode structure is arranged coaxially with the metal stranded wire workpiece and is used to undergo an anodic oxidation reaction with the metal stranded wire workpiece.

2. The anodizing apparatus according to claim 1, characterized in that, The anodizing apparatus also includes a base disposed within the container, the base being used to fix the cathode structure.

3. The anodizing apparatus according to claim 1, characterized in that, The cathode structure and / or the container are connected to a positioning mechanism, which supports the metal stranded workpiece and keeps the cathode structure and the metal stranded workpiece coaxially arranged.

4. The anodizing apparatus according to claim 1, characterized in that, The anodizing apparatus further includes a drive mechanism for moving the metal stranded workpiece along the axial direction of the cathode structure.

5. The anodizing apparatus according to claim 1, characterized in that, The cathode structure has multiple perforations that penetrate its circumferential surface.

6. The anodizing apparatus according to claim 1, characterized in that, The radial diameter of the cathode structure is 180mm-250mm.

7. The anodizing apparatus according to any one of claims 1-6, characterized in that, The metal stranded wire workpiece is configured as an aluminum stranded wire workpiece; and / or, the cathode structure is made of titanium metal; and / or, the electrolyte is configured as a phosphoric acid solution.

8. An anodizing method suitable for metal stranded wires, characterized in that, Includes the following steps: An anodizing apparatus as described in any one of claims 1-7 is provided, and a stranded metal workpiece; The metal stranded wire workpiece is subjected to alkaline washing; The metal stranded wire workpiece after alkaline washing is then cleaned and dried. The dried metal stranded wire workpiece is threaded through the cathode structure, with the threaded portion of the metal stranded wire workpiece arranged coaxially with the cathode structure, so that the metal stranded wire workpiece and the cathode structure undergo an anodic oxidation reaction.

9. The anodizing method according to claim 8, characterized in that, It also includes the following steps: The metal stranded wire workpiece is moved along the axial direction of the cathode structure at a preset rate until the circumferential surface of the metal stranded wire workpiece undergoes an anodic oxidation reaction with the cathode structure.

10. The anodizing method according to claim 8, characterized in that, It also includes the following steps: The metal stranded wire workpiece after the reaction is completed is cleaned, vacuum impregnated, and dried.

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