Anti-corrosion packaging method for marine induction transmission magnetic ring and marine induction transmission device

Abstract

The present invention discloses an anti-corrosion packaging method for a marine inductive transmission magnetic ring and a marine inductive transmission device. The marine inductive transmission device includes a shell and a magnetic ring. The magnetic ring is a split magnetic ring, including an upper half ring and a lower half ring, each including a split surface and a non-split surface. The shell includes an upper cabin and a lower cabin, each formed with a relative cavity for accommodating the magnetic ring. The split surfaces of the upper half ring and the lower half ring are relative and connected. The anti-corrosion packaging method includes the following steps: depositing a nano-metal film on the surface of the magnetic ring; electroplating a porous alloy shell layer on the outer side of the nano-metal film on the non-split surface of the magnetic ring; providing a dense magnetic conductive coating on the split surface; and respectively encapsulating the upper half ring and the lower half ring in the upper cabin and the lower cabin using a filler. The present invention reduces electromagnetic effects and heat accumulation and magnetic ring deformation, improves the stability and reliability of inductive transmission, and extends its service life.

Description

Technical Field

[0001] The present invention belongs to the technical field of marine measuring instruments, and in particular relates to an anti-corrosion packaging method for a marine induction transmission magnetic ring and a marine induction transmission device. Background Art

[0002] With the rapid development of profile observation technology for underwater environmental elements, the demand for timely ocean data is becoming increasingly stringent. Inductive coupling transmission technology, which enables real-time acquisition of underwater profile data, lays the foundation for real-time data acquisition from offshore platforms such as real-time buoys and real-time submersibles. Due to its high efficiency and low loss, inductive coupling transmission technology has also been widely used in power transmission, data communications, wireless charging, and other fields.

[0003] Ferrite rings are key components in inductively coupled transmission systems, and their performance directly impacts transmission efficiency and stability. However, in marine applications, ferrite rings are susceptible to microcracks due to the dual effects of periodic electromagnetic tension and seawater erosion and corrosion. This can lead to overall cracking of the ferrite ring, degrading the performance of the inductively coupled transmission system, shortening its service life, and even causing it to fail, seriously impacting the normal operation of ocean observation and detection systems.

[0004] Therefore, improving the durability of ferrite rings in seawater environments is the key to ensuring the long-term stable operation of the inductively coupled transmission system. Summary of the Invention

[0005] The present invention provides an anti-corrosion packaging method for a marine induction transmission magnetic ring and a marine induction transmission device, which reduce heat accumulation caused by electromagnetic action, deformation caused by electromagnetic force and mechanical scouring, improve the stability and reliability of induction transmission, and extend the life of the marine induction transmission device.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A method for anti-corrosion packaging of a marine induction transmission magnetic ring, wherein the magnetic ring is a split ferrite magnetic ring, comprising an upper half ring and a lower half ring; the surfaces of the upper half ring and the lower half ring respectively comprise a split surface and a non-split surface; the housing comprises an upper cabin and a lower cabin, each of which is formed with a cavity facing each other and for accommodating the upper half ring and the lower half ring; when the upper half ring and the lower half ring are placed in the upper cabin and the lower cabin, the split surfaces of the upper half ring and the lower half ring are facing each other and connected;

[0008] The anti-corrosion packaging method comprises:

[0009] Depositing a nano-metal film on the surface of the magnetic ring;

[0010] Electroplating a porous alloy shell layer on the outer side of the nano-metal film on the non-split surface of the magnetic ring;

[0011] providing a magnetic conductive coating on the split surface of the magnetic ring;

[0012] The upper half ring and the lower half ring are respectively encapsulated in the upper cabin body and the lower cabin body by a filler.

[0013] In some specific embodiments, depositing the nano-metal film on the surface of the magnetic ring is achieved by magnetron sputtering;

[0014] The components of the nano metal film include any two or three of iron, nickel, cobalt and their alloys.

[0015] In some specific embodiments, the sputtering power of the magnetron sputtering method ranges from 11 to 50 W / cm2, and the thickness of the nanometal film ranges from 0.1 to 5 μm.

[0016] In some specific embodiments, the preparation of the shell layer and the magnetic conductive coating comprises the following steps:

[0017] Using a porous filter membrane to wrap the non-split surface of the magnetic ring;

[0018] The magnetic ring is placed in an electroplating solution containing any two or three metal ions selected from FeSO4, CoCl2, NiSO4·6H2O, and NiCl2·5H2O, as well as MnSO4 (1.5-45 g / L) and H3BO3 (45 g / L); the pH value of the electroplating solution is 2.0-4.1;

[0019] Electrochemical deposition was performed; the current density range was 0.2 to 12 A / dm 2 ; The electroplating temperature is maintained at 55-60°C; the electroplating solution is continuously stirred at a speed of 250r / min and the solution temperature is kept constant; the shell layer is formed on the non-split surface; and the initial coating is formed on the split surface.

[0020] In some specific embodiments, the thickness of the shell layer ranges from 5 to 25 μm; and the thickness of the initial coating layer ranges from 0.1 to 5 μm.

[0021] In some specific embodiments, the forming of the magnetic conductive coating further comprises the following steps:

[0022] The initial coating is treated by a chemical method to obtain the magnetic conductive coating; the chemical method is to place the initial coating in an oxidant and complexing agent solution and soak it for 2 to 6 hours under an ultrasonic environment of -10 to 2°C; the oxidant is persulfate, and its concentration range is 10 to 30 g / L; the complexing agent is sodium citrate, and its concentration range is 20 to 50 g / L; the pH range is 4.1 to 6.1; and the ultrasonic power is 10 to 60 W.

[0023] In some specific embodiments, the filler includes a first filler and a second filler; and the step of encapsulating the upper half ring and the lower half ring in the upper cabin and the lower cabin respectively by using the filler includes:

[0024] Installing the upper half ring and the lower half ring into the cavities of the upper cabin and the lower cabin respectively, with the split surfaces facing outwards;

[0025] Filling the first filler into the gap between the non-split surface of the magnetic ring and the cavity and performing curing and heat preservation treatment; the first filler includes an aliphatic epoxy resin, an aliphatic amine curing agent, and a diluent benzyl alcohol in a volume ratio of (3-5):1, with a ratio of 0.15-0.25; the curing temperature is -5-5°C, and the curing time is 36-108 hours; after curing, the mixture is kept at 25°C for 8-24 hours;

[0026] The second filler is filled into the non-split surface of the magnetic ring, the surface of the first filler and the gap between it and the cavity, and then cured and heat-insulated. The second filler includes 3 to 5 parts of epoxy resin, 1 part of fatty amine curing agent, and 0.01-0.03 parts of barium carbonate filler. The second filler is obtained by mixing the above components evenly and then vacuuming for 0.5 to 5 minutes at a temperature of -5 to 15°C for degassing; the vacuum degree is 0.15 to 0.85 standard atmospheric pressure; the curing temperature is 0 to 5°C; the curing time is 24 to 96 hours; after curing, the second filler is kept warm at 25°C for 12 to 24 hours.

[0027] A marine inductive transmission device comprises a split magnetic ring and a shell; the magnetic ring is a split ferrite magnetic ring, which is anti-corrosion treated by the above-mentioned anti-corrosion packaging method and packaged in the shell.

[0028] Compared with the prior art, the advantages and positive effects of the present invention are: the marine induction transmission device and the anti-corrosion packaging method of the marine induction transmission magnetic ring of the present invention not only improve the heat conduction performance generated by the magnetic ring and reduce the temperature of the magnetic ring by depositing a nano-metal film on the surface of the magnetic ring, but also produce a matrix that is easy to electroplate, so that the shell layer and magnetic conductive coating generated by electroplating are more tightly combined with the magnetic ring, and combined with the porous alloy material, the mechanical strength and wear resistance of the magnetic ring are improved, and the deformation resistance and impact resistance are improved. In addition, the magnetic ring is encapsulated in the shell to improve the sealing, prevent corrosion from seawater, improve the stability and reliability of the marine induction transmission device and extend its life. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 It is a schematic structural diagram of the ocean induction transmission device proposed by the present invention;

[0031] Figure 2 is a cross-sectional structural diagram of a marine inductive transmission device according to an embodiment;

[0032] Figure 3 is a cross-sectional structural diagram of a marine inductive transmission device according to an embodiment;

[0033] Figure 4 is a schematic structural diagram of a magnetic ring according to an embodiment;

[0034] Figure 5 is a schematic structural diagram of the upper half ring according to an embodiment;

[0035] Figure 6 Schematic diagram of the structure of the lower half ring according to the embodiment

[0036] Figure 7 It is a flowchart of the anti-corrosion packaging method according to an embodiment.

[0037] In the figure,

[0038] 1. Shell; 11. Upper cabin; 12. Lower cabin; 13. Cavity; 2. Magnetic ring; 21. Upper half ring; 22. Lower half ring; 23. Split surface; 24. Non-split surface. DETAILED DESCRIPTION

[0039] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0040] Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 The present invention discloses an anti-corrosion packaging method for a marine induction transmission magnetic ring 2 and a marine induction transmission device obtained by the above-mentioned anti-corrosion packaging method.

[0041] The marine inductive transmission device includes a shell 1 and a magnetic ring 2; the magnetic ring 2 is a ferrite split magnetic ring, including an upper half ring 21 and a lower half ring 22, which respectively include a split surface 23 and a non-split surface 24; and the split surface 23 is parallel to the axis of the magnetic ring 2.

[0042] The shell 1 includes an upper cabin body 11 and a lower cabin body 12, which respectively form cavities 13 that are opposite and used to install an upper half ring 21 and a lower half ring 22; the upper half ring 21 and the lower half ring 22 are respectively fixedly installed in the cavities 13 of the upper cabin body 11 and the lower cabin body 12; the upper cabin body 11 and the lower cabin body 12 are installed and adapted and fixed together, and the split surface 23 of the upper half ring 21 located in the upper cabin body 11 and the split surface 23 of the lower half ring 22 located in the lower cabin body 12 are opposite and connected, so that the upper half ring 21 and the lower half ring 22 form a complete magnetic ring 2.

[0043] The anti-corrosion packaging method of the magnetic ring 2 in the marine induction transmission device includes:

[0044] S1. Depositing a nano-metal film on the surface of the magnetic ring 2; the surface of the magnetic ring 2 includes a split surface 23 and a non-split surface 22; that is, depositing a nano-metal film on both the split surface 23 and the non-split surface 24 of the magnetic ring 2 to improve the thermal conductivity of the magnetic ring 2;

[0045] S2. Electroplating a porous alloy shell layer on the nano-metal film on the non-split surface 24 of the magnetic ring 2; that is, electroplating is performed on the non-split surface 24 of the magnetic ring 2 using the nano-metal film as a substrate, forming a porous alloy shell layer on the outside of the metal film, thereby enhancing the mechanical strength and preventing the magnetic ring 2 from deformation caused by electromagnetic effects and external impacts;

[0046] S3. A dense magnetic conductive coating is provided on the split surface 23 of the magnetic ring 2; that is, a dense magnetic conductive coating is formed with the nano-metal film on the split surface 23 as a matrix, thereby enhancing the mechanical strength of the magnetic ring 2 while ensuring the conduction of the magnetic flux circuit;

[0047] S4. Encapsulate the upper half ring 21 and the lower half ring 22 in the cavities 13 of the upper cabin 11 and the lower cabin 12 respectively through a filler to achieve encapsulation and mechanical protection of the magnetic ring 2 and the shell 1.

[0048] Of course, the order of step S2 and step S3 can be adjusted as needed.

[0049] The marine inductive transmission device and the anti-corrosion packaging method of the marine inductive transmission magnetic ring of the present invention not only improve the heat conduction performance generated by the magnetic ring 2 and reduce the temperature of the magnetic ring 2 by depositing a nano-metal film on the surface of the magnetic ring 2, but also produce a matrix that is easy to electroplate, so that the shell layer and magnetic conductive coating generated by electroplating are more tightly combined with the magnetic ring 2. Combined with the porous alloy material, the mechanical strength and wear resistance of the magnetic ring 2 are improved, and the deformation resistance and impact resistance are improved. In addition, the magnetic ring 2 is encapsulated in the shell 1 to improve the sealing, prevent corrosion from seawater, and improve the stability and reliability of the marine inductive transmission device and extend its life.

[0050] The specific process and principle of the anti-corrosion packaging method of the present invention and the structure and principle of the marine induction transmission device are described in detail below through specific embodiments.

[0051] In some specific embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 In the anti-corrosion packaging method, the nano-metal film is deposited on the surface of the magnetic ring 2 by magnetron sputtering; and the components of the nano-metal film include any two or three of iron, cobalt, nickel and their alloys.

[0052] The nano-metal film of the magnetic ring 2 of the ocean inductive transmission device is made of any two or three of iron, cobalt, nickel and their alloys, and is produced by magnetron sputtering.

[0053] The corrosion-resistant packaging method and marine inductive transmission device of this embodiment deposits a nano-metal film of iron, cobalt, nickel, and their alloys on the surface of the magnetic ring 2, which not only improves the cumulative heat conduction performance of the ferrite magnetic ring 2 but also inhibits the expansion of microcracks during the ferrite processing process. The reduction of microcracks helps prevent seawater from penetrating into the magnetic ring 2 through the cracks, avoiding electrochemical corrosion, thereby protecting the mechanical and magnetic properties of the magnetic ring 2, thereby improving the performance and reliability of the entire inductive coupling transmission system and delaying its aging and failure in seawater environments. In addition, a metal electroplating matrix is ​​formed to improve the bonding of the electroplating.

[0054] In some specific embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 The sputtering power range of magnetron sputtering method is 11~50W / cm 2 , thickness is 0.1~5μm.

[0055] In some specific embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 , the preparation of the shell layer comprises the following steps:

[0056] The non-split surface 24 of the magnetic ring 2 is wrapped with a porous filter membrane; for example, the porous filter membrane is made of polyvinylidene fluoride (PVDF);

[0057] The magnetic ring 2 wrapped with the porous filter membrane is placed in the electroplating solution; the composition of the electroplating solution includes any two or three metal ions of FeSO4, CoCl2, NiSO4·6H2O, NiCl2·5H2O, and MnSO4 (1.5-45g / L), H3BO3 (45g / L); the pH value is 2.0-4.1; the concentration range of divalent iron ions is 50-150g / L, the concentration range of divalent cobalt ions is The concentration of nickel ions ranges from 30 to 100 g / L, and the concentration of divalent nickel ions ranges from 250 to 550 g / L. For example, the plating solution comprises FeSO4 (50-150 g / L), CoCl2 (30-100 g / L), NiSO4·6H2O (205-505 g / L), NiCl2·5H2O (45 g / L), MnSO4 (1.5-45 g / L), and H3BO3 (45 g / L).

[0058] Electrochemical deposition was performed; the current density range was 0.2-12A / dm 2 ; The electroplating temperature is maintained at 55-60°C; the electroplating solution is continuously stirred at a speed of 250r / min and the solution temperature is kept constant.

[0059] A shell layer is formed on the non-split surface; an initial coating is formed on the split surface.

[0060] Of course, the stirring speed of the plating solution can fluctuate around 250r / min.

[0061] The shell of the magnetic ring 2 of the marine inductive transmission device is produced by the above-mentioned electroplating deposition method.

[0062] The anti-corrosion packaging method of this embodiment enables the magnetic ring 2 of the marine induction transmission device to generate a shell with enhanced thermal conductivity and stress absorption capability, effectively suppressing the deformation of the magnetic ring 2 under the action of temperature and electromagnetic cycle, reducing its structural stress, and effectively avoiding the occurrence of cracks and corrosion in the magnetic ring, thereby further improving the stability, reliability and life of the marine induction transmission device.

[0063] In some specific embodiments, the shell layer has a thickness ranging from 15 to 25 μm and a porosity of 0.1 to 0.8 cells / cm2 ; The thickness of the initial coating is 0.1~5μm.

[0064] In some specific embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 , the step of forming the magnetic conductive coating further includes:

[0065] The initial coating is treated by a chemical method to obtain a magnetic conductive coating; the chemical method is to place the initial coating in an oxidant and complexing agent solution and soak it for 2 to 6 hours under an ultrasonic environment of -10 to 2°C; the oxidant is persulfate, and its concentration range is 10 to 30 g / L; the complexing agent is sodium citrate, and its concentration range is 20 to 50 g / L; the pH range is 4.1 to 6.1; and the ultrasonic power is 10 to 60 W.

[0066] Cobalt-manganese alloy has specific magnetic properties. The ions of cobalt and manganese form an arrangement that is conducive to the transfer of magnetic moment and the conduction of magnetic flux, allowing electrons to move relatively easily, thereby ensuring the conductivity of the magnetic circuit and allowing the magnetic flux to effectively pass through the magnetic conductive coating and the split ferrite ring 2;

[0067] The anti-corrosion packaging method and the marine inductive transmission device of this embodiment ensure the conduction of the magnetic flux circuit under the action of the AC signal by providing a magnetic conductive coating with properties similar to spinel, maintain the magnetic properties of the magnetic ring 2, and ensure the normal operation of the inductive coupling transmission system; in addition, the magnetic conductive coating increases the strength of the split surface 23 of the magnetic ring 2, improves the mechanical properties, and thereby improves the stability and reliability of the marine inductive transmission device and extends its service life.

[0068] In some specific embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 The filling agent includes a first filling agent and a second filling agent; the steps of encapsulating the upper half ring 21 and the lower half ring 22 to the upper cabin 11 and the lower cabin 12 respectively include:

[0069] Install the upper half ring 21 and the lower half ring 22 into the cavities 13 of the upper cabin 11 and the lower cabin 12 respectively, with the split surfaces 23 facing outwards;

[0070] Filling a first filler into the gap between the non-split surface 24 of the magnetic ring 2 and the cavity 13 and performing a curing and heat-insulating treatment; the first filler comprises an aliphatic epoxy resin, an aliphatic amine curing agent, and a diluent benzyl alcohol in a volume ratio of (3-5):1, with a ratio of 0.15-0.25; the curing temperature is -5-5°C, and the curing time is 36-108 hours; after curing, the mixture is kept at 25°C for 8-24 hours;

[0071] The second filler is filled into the non-split surface 24 of the magnetic ring 2, the surface of the first filler and the gap between it and the cavity 13, and then cured and heat-insulated. The second filler includes 3 to 5 parts of epoxy resin, 1 part of fatty amine curing agent, and 0.01-0.03 parts of barium carbonate filler. The second filler is obtained by mixing the above ingredients evenly and then vacuuming for 0.5 to 5 minutes at a temperature of -5 to 15°C for degassing; the vacuum degree is 0.15 to 0.85 standard atmospheric pressure; the curing temperature is 0 to 5°C; the curing time is 24 to 96 hours; after curing, the second filler is kept warm at 25°C for 12 to 24 hours.

[0072] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0073] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0074] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0075] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0076] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0077] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for anti-corrosion packaging of a marine inductive transmission magnetic ring, wherein the magnetic ring is a split ferrite magnetic ring, comprising an upper half ring and a lower half ring; the surfaces of the upper half ring and the lower half ring respectively include a split surface and a non-split surface; the housing comprises an upper cabin and a lower cabin, each of which has a cavity opposite to and for accommodating the upper half ring and the lower half ring; when the upper half ring and the lower half ring are placed in the upper cabin and the lower cabin, the split surfaces of the upper half ring and the lower half ring are opposite and connected; It is characterized in that include: Depositing a nano-metal film on the surface of the magnetic ring; Electroplating a porous alloy shell layer on the outer side of the nano-metal film on the non-split surface of the magnetic ring; providing a magnetic conductive coating on the split surface of the magnetic ring; The upper half ring and the lower half ring are respectively encapsulated in the upper cabin body and the lower cabin body by a filler.

2. The anti-corrosion packaging method according to claim 1, characterized in that: Depositing the nano-metal film on the surface of the magnetic ring is achieved by magnetron sputtering; The components of the nano metal film include any two or three of iron, nickel, cobalt and their alloys.

3. The anti-corrosion packaging method according to claim 2, characterized in that: The sputtering power range of the magnetron sputtering method is 11~50W / cm 2 The thickness of the nano metal film is 0.1~5μm.

4. The anti-corrosion packaging method according to claim 1, characterized in that: The preparation of the shell layer and the magnetic conductive coating comprises the following steps: Using a porous filter membrane to wrap the non-split surface of the magnetic ring; The magnetic ring is placed in an electroplating solution containing any two or three metal ions selected from FeSO4, CoCl2, NiSO4·6H2O, and NiCl2·5H2O, as well as 1.5-45 g / L of MnSO4 and 45 g / L of H3BO3; and a pH value of 2.0-4.

1. Electrochemical deposition is performed; the current density range is 0.2~12A / dm²; the electroplating temperature is maintained at 55~60°C; the electroplating solution is continuously stirred at a speed of 250 r / min and the solution temperature is maintained constant; the shell layer is formed on the non-split surface; and the initial coating is formed on the split surface.

5. The anti-corrosion packaging method according to claim 4, characterized in that: The thickness of the shell layer ranges from 5 to 25 μm; the thickness of the initial coating ranges from 0.1 to 5 μm.

6. The anti-corrosion packaging method according to claim 4, characterized in that: The formation of the magnetic conductive coating further comprises the following steps: The initial coating is treated by a chemical method to obtain the magnetic conductive coating; the chemical method is to place the initial coating in an oxidant and complexing agent solution and soak it for 2 to 6 hours under an ultrasonic environment of -10 to 2°C; the oxidant is persulfate, and its concentration range is 10 to 30 g / L; the complexing agent is sodium citrate, and its concentration range is 20 to 50 g / L; the pH range is 4.1 to 6.1; and the ultrasonic power is 10 to 60 W.

7. The anti-corrosion packaging method according to any one of claims 1 to 6, characterized in that: The filler includes a first filler and a second filler; and the step of encapsulating the upper half ring and the lower half ring in the upper cabin and the lower cabin respectively by the filler includes: Installing the upper half ring and the lower half ring into the cavities of the upper cabin and the lower cabin respectively, with the split surfaces facing outwards; Filling the first filler into the gap between the non-split surface of the magnetic ring and the cavity and performing a curing and heat-insulating treatment; the first filler comprises an aliphatic epoxy resin, an aliphatic amine curing agent, and a diluent benzyl alcohol in a volume ratio of (3-5):1, with a ratio of 0.15-0.25; the curing temperature is -5-5°C, and the curing time is 36-108 hours; after curing, the mixture is kept at 25°C for 8-24 hours; The second filler is filled into the non-split surface of the magnetic ring, the surface of the first filler, and the gap between the first filler and the cavity, and then cured and heat-insulated. The second filler includes 3 to 5 parts of epoxy resin, 1 part of fatty amine curing agent, and 0.01-0.03 parts of barium carbonate filler. The second filler is obtained by mixing the above components evenly and then vacuuming for 0.5 to 5 minutes at a temperature of -5 to 15°C for degassing. The vacuum degree is 0.15 to 0.85 standard atmospheric pressure. The curing temperature is 0 to 5°C and the curing time is 24 to 96 hours. After curing, the second filler is kept at 25°C for 12 to 24 hours.

8. A marine induction transmission device, characterized in that: It comprises a split magnetic ring and a shell; the magnetic ring is a split ferrite magnetic ring, which is anti-corrosion treated and packaged in the shell using the anti-corrosion packaging method described in any one of claims 1 to 7.

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