Anti-corrosion structure of an electric zinc cathode plate

Abstract

The utility model relates to the technical field of zinc cathode plate, especially to a kind of anticorrosive structure of zinc cathode plate, including: cathode plate body and anticorrosive layer, the top end of cathode plate body is provided with slot, the top end of cathode plate body is provided with crossbeam, the bottom end of crossbeam is symmetrically provided with J type connecting rod, two the J type connecting rod is inserted with slot, the top end of cathode plate body is provided with anticorrosive layer, and anticorrosive layer is divided into bottom layer transition layer, middle layer anticorrosive layer and surface layer functional layer, the utility model provides through the layered design of " bottom layer nickel-chromium alloy sputtering transition layer, middle layer graphene modified alumina ceramic layer, surface layer fluorine modified epoxy functional layer " and " two-way threaded rod adjustable connecting structure", not only improve the service life of anticorrosive layer, and strengthen the stability between crossbeam and cathode plate body, also reduce dismounting difficulty.

Description

Technical Field

[0001] This utility model relates to the field of electrolytic zinc cathode plate technology, and in particular to an anti-corrosion structure for electrolytic zinc cathode plates. Background Technology

[0002] In hydrometallurgical electrolytic zinc production, the cathode plate is the core carrier for zinc ion reduction deposition, and its corrosion resistance and structural stability directly determine the continuity of production and overall cost. To address the problem of traditional cathode plates (aluminum / aluminum alloy substrate) being susceptible to electrochemical corrosion and having a short lifespan in acidic electrolytes (zinc sulfate-sulfuric acid system) at 40-60℃, targeted improvement solutions have emerged in existing technologies—such as the "Anti-corrosion Layer Structure of an Electrolytic Zinc Cathode Plate" disclosed in patent CN217149343U. The core design of this patent is to set a ceramic layer on the surface of the cathode plate as the main anti-corrosion agent, aiming to improve anti-corrosion performance through the chemical stability of ceramic materials. Compared with the earlier single epoxy coating (lifespan 3-6 months), this patent offers some improvement in acid corrosion resistance. However, in industrial applications, its design relying solely on a single ceramic layer still has shortcomings. In patent CN217149343U, the ceramic layer is directly coated on the surface of the aluminum substrate of the cathode plate without a transition layer, leading to two major problems: Poor thermal compatibility: Ceramic materials (such as alumina ceramics) have a coefficient of thermal expansion of approximately 8 × 10⁻⁶. -6 / ℃, while the coefficient of thermal expansion of the aluminum matrix is ​​approximately 23×10. -6 / ℃, the difference between the two is 15×10 -6 / ℃ or above. In the production of electrolytic zinc, fluctuations in electrolyte temperature (40-60℃) can cause significant thermal stress between the ceramic layer and the substrate. After long-term cycling, microcracks are prone to appear in the ceramic layer, and the expansion of these cracks can lead to the overall peeling off of the coating. Insufficient adhesion: This patent uses a conventional coating process to prepare the ceramic layer, and the coating and the substrate are physically adsorbed together, resulting in an adhesion of only 15-25 MPa, far below the requirements for long-term industrial use (≥40 MPa). When the cathode plate is subjected to mechanical stress during hoisting or electrolyte erosion, the ceramic layer is easily peeled off from the substrate surface, and the exposed substrate is quickly corroded by the acidic electrolyte, resulting in a cathode plate lifespan of only 8-12 months, requiring frequent replacement.

[0003] Therefore, it is necessary to provide a new anti-corrosion structure for electrolytic zinc cathode plates to solve the above-mentioned technical problems. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides an anti-corrosion structure for an electrolytic zinc cathode plate.

[0005] The anti-corrosion structure of the electrolytic zinc cathode plate provided by this utility model includes: a cathode plate body and an anti-corrosion layer. A slot is provided at the top of the cathode plate body, and a crossbeam is provided at the top of the cathode plate body. J-shaped connecting rods are symmetrically provided at the bottom of the crossbeam. The two J-shaped connecting rods are inserted into the slot. An anti-corrosion layer is provided at the top of the cathode plate body, and the anti-corrosion layer is divided into a bottom transition layer, a middle anti-corrosion layer and a surface functional layer.

[0006] Preferably, the bottom transition layer of the anti-corrosion layer is a 5-10μm nickel-chromium alloy sputtering layer, which improves the adhesion between the substrate and the middle anti-corrosion layer.

[0007] Preferably, the middle anti-corrosion layer is a 30-50μm graphene-modified alumina ceramic coating.

[0008] Preferably, the surface functional layer of the anti-corrosion layer is a 2-3μm fluorine-modified epoxy coating to reduce the adhesion strength of the zinc layer.

[0009] Preferably, a groove is provided inside the bottom end of the crossbeam, and a bidirectional threaded rod is rotatably connected inside the groove. Threaded sliders are symmetrically slidably connected to the inner wall of the groove. The two threaded sliders are respectively threaded to both ends of the bidirectional threaded rod, and the threaded sliders are fixedly connected to one end of the J-shaped connecting rod.

[0010] Preferably, the two ends of the bidirectional threaded rod extend out of the crossbeam and are provided with internal hexagonal grooves.

[0011] Compared with related technologies, the anti-corrosion structure of the electrolytic zinc cathode plate provided by this utility model has the following beneficial effects: The anti-corrosion structure of the electrolytic zinc cathode plate in this application, through the layered design of "bottom nickel-chromium alloy sputtered transition layer, middle graphene modified alumina ceramic layer, and surface fluorine modified epoxy functional layer" and "two-way threaded rod adjustable connection structure", not only improves the service life of the anti-corrosion layer, but also enhances the stability between the crossbeam and the cathode plate body, and reduces the difficulty of disassembly and assembly. The bottom nickel-chromium alloy sputtered transition layer enhances adhesion to the cathode substrate through metallurgical bonding, while alleviating interlayer thermal stress and preventing coating cracking or peeling due to temperature fluctuations, providing a solid foundation for the overall anti-corrosion system. The middle graphene-modified alumina ceramic layer fills ceramic pores with graphene sheets, forming a dense anti-corrosion barrier that effectively blocks the penetration of corrosive ions in acidic electrolytes, extending the long-term protection cycle of the cathode plate. The top fluorine-modified epoxy functional layer significantly reduces the surface energy of the coating, facilitating easy peeling of the zinc layer and reducing damage to the coating during the peeling process. It also has a certain degree of corrosion resistance, further enhancing the overall anti-corrosion effect. The three-layer structure works synergistically to ensure the service life and operational stability of the cathode plate. Attached Figure Description

[0012] Figure 1A schematic diagram of the anti-corrosion structure of the electrolytic zinc cathode plate provided by this utility model; Figure 2 for Figure 1 The diagram shows the structure of the slot at the top of the cathode plate body; Figure 3 for Figure 1 The diagram shows the internal structure of the beam. Figure 4 for Figure 3 The diagram shows the structure of the anti-corrosion layer.

[0013] The following are the labeling elements in the diagram: 1. Cathode plate body; 2. Slot; 3. Crossbeam; 4. J-type connecting rod; 5. Anti-corrosion layer; 6. Groove; 7. Two-way threaded rod; 8. Threaded slider; 9. Internal hexagonal groove; 51. Bottom transition layer; 52. Middle anti-corrosion layer; 53. Surface functional layer. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0015] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0016] Please see Figure 1-4 An anti-corrosion structure for an electrolytic zinc cathode plate includes: a cathode plate body 1 and an anti-corrosion layer 5. A slot 2 is provided at the top of the cathode plate body 1, and a crossbeam 3 is provided at the top of the cathode plate body 1. J-shaped connecting rods 4 are symmetrically provided at the bottom of the crossbeam 3. The two J-shaped connecting rods 4 are inserted into the slot 2. The anti-corrosion layer 5 is provided at the top of the cathode plate body 1, and the anti-corrosion layer 5 is divided into a bottom transition layer 51, a middle anti-corrosion layer 525, and a surface functional layer 53. The bottom transition layer 51 of the anti-corrosion layer 5 is a 5-10μm nickel-chromium alloy sputtering layer, which improves the bonding force between the substrate and the middle anti-corrosion layer 525. The middle anti-corrosion layer 525 of the anti-corrosion layer 5 is a 30-50μm graphene-modified alumina ceramic coating. The surface functional layer 53 of the anti-corrosion layer 5 is a 2-3μm fluorine-modified epoxy coating, which reduces the adhesion strength of the zinc layer.

[0017] The bottom end of the crossbeam 3 has a groove 6 inside, and a bidirectional threaded rod 7 is rotatably connected inside the groove 6. Threaded sliders 8 are symmetrically slidably connected to the inner wall of the groove 6. The two threaded sliders 8 are respectively threaded to both ends of the bidirectional threaded rod 7. The threaded sliders 8 are fixedly connected to one end of the J-type connecting rod 4. The two ends of the bidirectional threaded rod 7 extend out of the crossbeam 3 and have internal hexagonal grooves 96.

[0018] The working principle of the anti-corrosion structure of the electrolytic zinc cathode plate provided by this utility model is as follows: I. Structural Assembly and Fixing Principles: Ensuring Overall Structural Stability The core structural connection of the electrolytic zinc cathode plate relies on the coordinated operation of "crossbeam 3 - J-type connecting rod 4 - cathode plate body 1", and the specific working logic is as follows: Connection adjustment mechanism: The groove 6 inside the bottom end of the crossbeam 3 provides installation space for the bidirectional threaded rod 7. The two ends of the bidirectional threaded rod 7 and the threaded slider 8 form a threaded pair (the threads turn in opposite directions). When an Allen wrench is inserted into the Allen groove 96 at both ends of the bidirectional threaded rod 7 and rotated, the threaded slider 8 will slide symmetrically (moving in opposite directions) along the inner wall of the groove 6, thereby driving the J-type connecting rod 4, which is fixedly connected to the threaded slider 8, to adjust the spacing.

[0019] Precise Fixing Logic: Based on the position and dimensions of the slot 2 at the top of the cathode plate body 1, the spacing between the two J-type connecting rods 4 is matched with the slot 2 by adjusting the bidirectional threaded rod 7. Then, the J-type connecting rods 4 are inserted into the slot 2, completing the mechanical connection between the crossbeam 3 and the cathode plate body 1. This structure, through the self-locking property of the threaded drive (the frictional force of the threaded pair is greater than the external force), ensures no loosening after connection. Even under conditions such as cathode plate hoisting or shaking within the electrolytic cell, the overall structure remains stable, preventing the crossbeam 3 from falling off or shifting and affecting electrolytic zinc production. II. Five-layer anti-corrosion protection principle: Constructing a multi-dimensional anti-corrosion barrier The three-layer structure of anti-corrosion layer 5—"bottom transition layer 51 - middle anti-corrosion layer 525 - surface functional layer 53"—forms a progressive protection system to address issues such as electrolyte corrosion and zinc layer adhesion during electrolytic zinc treatment. 1. Underlying Transition Layer 51: A "Bridge" for Strengthening Coating Adhesion Material and process characteristics: A 5-10μm nickel-chromium alloy sputtering layer is used, which is prepared by physical sputtering process - high-energy particles bombard the nickel-chromium alloy target material, so that the alloy particles are deposited on the surface of the cathode plate body 1 to form a dense and uniform film. Working principle: The nickel-chromium alloy and the cathode plate body 1 (usually an aluminum or aluminum alloy matrix) have excellent chemical compatibility and thermal matching: First, the coefficient of thermal expansion of nickel-chromium alloy is close to that of aluminum substrate, which can reduce the internal stress of coating caused by temperature changes (such as the rise of electrolyte temperature during electrolysis) and avoid coating cracking. Secondly, the sputtered layer and the substrate interface are "metallurgical bonded", with adhesion far exceeding that of traditional brushed coatings. This effectively prevents the subsequent intermediate anti-corrosion layer 525 from falling off due to insufficient adhesion, thus laying the foundation for the overall anti-corrosion system.

[0020] 2. Middle Anti-corrosion Layer 525: The "Core Defense" Against Corrosive Media Material synergy advantages: 30-50μm graphene-modified alumina ceramic coating, with alumina ceramic as the matrix and graphene nanosheets incorporated to form a composite structure. Anti-corrosion principle: First, alumina ceramics themselves have extremely high chemical stability, being resistant to acids and alkalis (most zinc electrolytes are acidic), and can directly resist the H+ in the electrolyte. + SO4 2- The corrosion of ions; Secondly, the addition of graphene can fill the tiny pores in the alumina ceramic coating (traditional ceramic coatings are prone to pores due to insufficient sintering), forming a "pore-free barrier"—the sheet structure of graphene can block the penetration path of corrosive ions, greatly reducing the probability of ions reaching the substrate through the coating. Third, the 30-50μm thickness design ensures that the coating is not worn or corroded during long-term electrolysis (the cathode plate typically has a service life of 1-2 years), providing long-term protection. 3. Surface functional layer 53: A "functional interface" balancing corrosion protection and zinc layer peeling. Material functional characteristics: 2-3μm fluorine-modified epoxy coating, which combines the corrosion resistance of epoxy with the low surface energy of fluorine materials by introducing fluorine atoms into epoxy resin for chemical modification. Dual-action principle: First, auxiliary corrosion protection: epoxy resin itself has good chemical resistance, which can further prevent trace corrosion ions in the electrolyte from penetrating to the middle layer; the introduction of fluorine atoms can improve the weather resistance and stain resistance of the coating, and prevent impurities in the electrolyte from adhering and affecting the corrosion protection effect. Secondly, it reduces zinc layer adhesion: Fluorine modification reduces the surface energy of the coating to 20-30 mN / m (far lower than traditional coatings). During the electrolytic zinc process, when zinc ions deposit on the cathode plate surface to form a zinc layer, the adhesion between the zinc layer and the coating is significantly weakened due to the low surface energy. In the subsequent zinc layer peeling process, only a small amount of external force is needed to peel the zinc layer off the cathode plate surface, which reduces mechanical damage to the anti-corrosion layer 5 and improves production efficiency. III. Collaborative Working Principle under Electrolytic Zinc Processing: Adapting to the Entire Production Process In actual electrolytic zinc production, the above structure achieves stable operation through multi-dimensional collaboration: Electrolysis stage: After the cathode plate is immersed in the acidic electrolyte, the middle core defense line of the anti-corrosion layer 5 blocks the corrosion ions from eroding the substrate, the bottom transition layer 51 ensures that the anti-corrosion layer 5 does not fall off, and the surface functional layer 53 prepares for the subsequent zinc layer peeling; at the same time, the fixing structure of the "crossbeam 3-J type connecting rod 4" ensures that the cathode plate is vertically suspended in the electrolyte, avoiding collision with the anode plate and ensuring uniform current distribution. Zinc layer peeling stage: After electrolysis, when the cathode plate is removed, the surface fluorine-modified epoxy coating makes the zinc layer easy to peel off. During the peeling process, the surface coating remains intact and can continue to protect the middle and bottom layers. The firm connection between the crossbeam 3 and the cathode plate body 1 ensures that the structure is not deformed during the lifting and peeling process and will not affect the next use. In summary, this structure, through a collaborative design of "mechanical fixing + layered corrosion protection + functional adaptation," not only solves the corrosion problem of the electrolytic zinc cathode plate, but also takes into account the stability and efficiency of the production process, extends the service life of the cathode plate, and reduces production costs.

[0021] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A corrosion-resistant structure for an electrolytic zinc cathode plate, characterized in that, include: The cathode plate body (1) has a slot (2) at the top and a crossbeam (3) at the top. J-shaped connecting rods (4) are symmetrically arranged at the bottom of the crossbeam (3). The two J-shaped connecting rods (4) are inserted into the slot (2). The anti-corrosion layer (5) is provided on the top of the cathode plate body (1), and the anti-corrosion layer (5) is divided into a bottom transition layer (51), a middle anti-corrosion layer (52) and a surface functional layer (53).

2. The anti-corrosion structure of the electrolytic zinc cathode plate according to claim 1, characterized in that, The bottom transition layer (51) of the anti-corrosion layer (5) is a 5-10μm nickel-chromium alloy sputtering layer, which improves the bonding force between the substrate and the middle anti-corrosion layer.

3. The anti-corrosion structure of the electrolytic zinc cathode plate according to claim 1, characterized in that, The middle anti-corrosion layer (52) of the anti-corrosion layer (5) is a 30-50μm graphene-modified alumina ceramic coating.

4. The anti-corrosion structure of the electrolytic zinc cathode plate according to claim 1, characterized in that, The surface functional layer (53) of the anti-corrosion layer (5) is a 2-3 μm fluorine-modified epoxy coating, which reduces the adhesion strength of the zinc layer.

5. The anti-corrosion structure of the electrolytic zinc cathode plate according to claim 1, characterized in that, The bottom end of the crossbeam (3) has a groove (6) inside, and a bidirectional threaded rod (7) is rotatably connected inside the groove (6). Threaded sliders (8) are symmetrically slidably connected to the inner wall of the groove (6). The two threaded sliders (8) are respectively threaded to both ends of the bidirectional threaded rod (7). The threaded sliders (8) are fixedly connected to one end of the J-type connecting rod (4).

6. The anti-corrosion structure of the electrolytic zinc cathode plate according to claim 5, characterized in that, The two ends of the bidirectional threaded rod (7) extend out of the crossbeam (3) and are provided with internal hexagonal grooves (9).

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