Corrosion resistant structure for nuclear waste canister coatings

Abstract

The utility model discloses a nuclear waste protection bucket coating's anticorrosion structure, including the bucket body base material and the protection outer layer, the protection outer layer is located the bucket body base material outside, the protection outer layer inside adds the additive four, the protection outer layer is close to the one side of bucket body base material and is provided with crystal layer two, crystal layer two is close to the one side of bucket body base material and is provided with crystal layer one, the protection outer layer adopts acrylic resin, the additive four adopts N -isopropyl acrylamide material, crystal layer one and crystal layer two adopt the coating and the coating respectively made of zirconium oxide material and the coating made of silicification silicon material, the one side of crystal layer one close to bucket body base material is provided with the barrier layer, the barrier layer adopts epoxy resin, the utility model discloses through setting crystal layer one, crystal layer two and the protection outer layer, can effectively resist the scratch and wear and tear of outside, and the additive four N -isopropyl acrylamide that adds among them can play the penetration of the corrosion prevention of hindering.

Description

Technical Field

[0001] This utility model relates to the field of surface engineering technology, specifically to the corrosion-resistant structure of the coating of nuclear waste protection containers. Background Technology

[0002] Nuclear waste is highly radioactive, and improper handling can cause extremely serious harm to the environment and human health. As a key container for storing and transporting nuclear waste, the corrosion resistance of its coating is crucial, directly affecting whether the nuclear waste can be safely sealed and preventing radioactive materials from leaking into the environment.

[0003] A search revealed a utility model patent with Chinese patent publication number CN217214171U, which discloses a nuclear waste storage and transportation container, specifically relating to the field of nuclear waste treatment technology. The container includes: a container body, a container flange, a sealing gasket, a container lid, and a container bottom. The container body has an opening at the top, an annular corrugated strip on the container body, and several vent holes on the container flange. One side surface of the sealing gasket is connected to one end of the vent holes, and the sealing gasket has several micropores. The container lid is installed at the opening at the top of the container body.

[0004] Nuclear waste containment containers are usually buried deep underground or stored in specific facilities, where they are exposed to harsh environments such as humidity, high salt content, and active microorganisms for a long time. For example, various ions in groundwater can react chemically with the container material, leading to corrosion. Therefore, a corrosion-resistant structure for the coating of nuclear waste containment containers is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a corrosion-resistant structure for the coating of nuclear waste protection containers, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a corrosion-resistant structure for the coating of a nuclear waste protection container, wherein the protective outer layer is located outside the container substrate, an additive four is added inside the protective outer layer, a crystal layer two is provided on the side of the protective outer layer near the container substrate, and a crystal layer one is provided on the side of the crystal layer two near the container substrate, the protective outer layer is made of acrylic resin, the additive four is made of N-isopropylacrylamide, and the crystal layer one and crystal layer two are respectively made of a coating made of zirconium oxide material and a coating made of silicon ammonia material.

[0007] It effectively resists external scratches and wear, and the added additive tetra-N-isopropylacrylamide can inhibit the penetration of corrosive substances. At low temperatures, N-isopropylacrylamide absorbs moisture from the surrounding environment and swells, filling the pores inside the coating and making the coating structure more compact, which can block the penetration of corrosive media such as moisture and oxygen. At high temperatures, the hydrophobic interaction between the N-isopropylacrylamide molecular chains is enhanced, the molecular chains collapse, and the polymer changes from a hydrophilic state to a hydrophobic state. The moisture in the coating is squeezed out, and the coating structure becomes relatively compact, which can effectively block the further penetration of corrosive media. When the outer protective layer loses its effectiveness due to long-term use or severe corrosion, the corrosive substances will further contact the crystalline zirconium monoxide coating, whose dense crystalline structure can effectively block the penetration of substances. Then it will come into contact with the crystalline silicon dinitride coating, which has excellent thermal and chemical stability and can maintain good performance in high temperature and corrosive environments. Thus, a three-layer protection is achieved, which can effectively prevent corrosive substances from damaging the barrel substrate.

[0008] As a further preferred embodiment of this technical solution, a barrier layer is provided on the side of the crystal layer near the barrel substrate, and the barrier layer is made of epoxy resin.

[0009] As a further preferred embodiment of this technical solution, an additive three is added to the barrier layer, and the additive three is made of phosphate.

[0010] Even if the corrosive substances penetrate the protective layer, the triphosphate additive added inside the barrier layer will be gradually released, forming a dense protective film on the surface, preventing further contact between the inner layer and the corrosive medium.

[0011] As a further preferred embodiment of this technical solution, a connecting layer is provided on the side of the barrier layer near the barrel substrate, and the connecting layer is attached to the outside of the barrel substrate.

[0012] As a further preferred embodiment of this technical solution, an additive is added to the interior of the connecting layer, and the additive is made of nano-sized alumina.

[0013] As a further preferred embodiment of this technical solution, an additive second is added to the interior of the connecting layer, and the additive second is made of silane coupling agent.

[0014] As a further preferred embodiment of this technical solution, an antibacterial agent is added to the interior of the protective outer layer, and the antibacterial agent is made of nano-silver.

[0015] This utility model provides a corrosion-resistant structure for the coating of nuclear waste protection containers, which has the following beneficial effects:

[0016] (1) This utility model, by setting a first crystal layer, a second crystal layer and a protective outer layer, can effectively resist external scratches and wear. The additive tetra-N-isopropylacrylamide can prevent the penetration of corrosive substances. At low temperature, N-isopropylacrylamide will absorb moisture from the surrounding environment and swell, filling the pores inside the coating and making the coating structure more compact, which can block the penetration of corrosive media such as moisture and oxygen. At high temperature, the hydrophobic interaction between the N-isopropylacrylamide molecular chains is enhanced, the molecular chains collapse, the polymer changes from a hydrophilic state to a hydrophobic state, the moisture in the coating is squeezed out, the coating structure becomes relatively compact, and it can effectively block the further penetration of corrosive media. When the protective outer layer loses its effectiveness due to long-term use or severe corrosion, the corrosive substances will further contact the zirconia coating of the crystal layer. Its crystal structure is dense and can effectively block the penetration of substances. Then it will contact the silicon dinitride coating of the crystal layer. It has excellent thermal stability and chemical stability and can still maintain good performance in high temperature and corrosive environment. Thus, three layers of protection are achieved, which can effectively prevent corrosive substances from damaging the barrel substrate.

[0017] (2) By setting a barrier layer, even if the corrosive substance breaks through the protective layer, the additive triphosphate added inside the barrier layer will be gradually released and can form a dense protective film on the surface, preventing the inner layer from further contacting the corrosive medium. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall first-view structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the overall second-view structure of this utility model;

[0020] Figure 3 For the present utility model Figure 1 Enlarged structural diagram at point A in the middle;

[0021] Figure 4 For the present utility model Figure 2 Enlarged structural diagram at point B;

[0022] In the diagram: 1. Barrel base material; 2. Connecting layer; 3. Barrier layer; 4. Crystal layer one; 5. Crystal layer two; 6. Protective outer layer; 201. Additive one; 202. Additive two; 301. Additive three; 601. Additive four; 602. Antibacterial agent. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0024] This utility model provides a technical solution: such as Figure 1, Figure 2 and Figure 3 As shown, in this embodiment, the corrosion-resistant structure of the nuclear waste protection container coating includes a container substrate 1 and a protective outer layer 6. The protective outer layer 6 is located outside the container substrate 1. Additive 601 is added inside the protective outer layer 6. A crystal layer 5 is provided on the side of the protective outer layer 6 near the container substrate 1. A crystal layer 4 is provided on the side of the crystal layer 5 near the container substrate 1. The protective outer layer 6 is made of acrylic resin, and additive 601 is made of N-isopropylacrylamide. The crystal layer 4 and crystal layer 5 are respectively made of zirconium oxide material and silicon ammonia material.

[0025] External corrosive substances first come into contact with the acrylic resin protective outer layer 6, which has high hardness and can effectively resist external scratches and wear. The added additive N-isopropylacrylamide (N-IOSAC) can hinder the penetration of corrosive substances. At low temperatures, N-isopropylacrylamide absorbs moisture from the surrounding environment and swells, filling the pores inside the coating and making the coating structure denser, thus blocking the penetration of corrosive media such as moisture and oxygen. At high temperatures, the hydrophobic interactions between the N-isopropylacrylamide molecular chains increase, the molecular chains collapse, and the polymer changes from a hydrophilic state to a hydrophilic state. When the coating becomes hydrophobic, the water in the coating is squeezed out, and the coating structure becomes relatively compact, which can effectively block the further penetration of corrosive media. When the outer protective layer 6 loses its effectiveness due to long-term use or severe corrosion, the corrosive substances will further contact the crystalline layer 4, the zirconium oxide coating, whose dense crystal structure can effectively block the penetration of substances. Then it will come into contact with the crystalline layer 5, the silicon nitride coating, which has excellent thermal and chemical stability and can maintain good performance in high temperature and corrosive environments. This achieves three-layer protection, which can effectively prevent corrosive substances from damaging the barrel substrate 1.

[0026] like Figure 1 and Figure 2 As shown, a barrier layer 3 is provided on the side of the crystal layer 4 near the base material 1 of the barrel. The barrier layer 3 is made of epoxy resin. Epoxy resin has good resistance to chemicals such as acids, alkalis and salts, and can remain stable in harsh chemical environments. In addition, its molecular structure is compact, making it difficult for water molecules to penetrate into its interior.

[0027] Additive 301 is added inside the barrier layer 3. Additive 301 is made of phosphate.

[0028] Even if the corrosive substances break through the protective layer, the additive tri-301 phosphate added inside the barrier layer 3 will be gradually released, forming a dense protective film on the surface, preventing further contact between the inner layer and the corrosive medium.

[0029] like Figure 2 and Figure 4As shown, a connecting layer 2 is provided on the side of the barrier layer 3 near the barrel substrate 1, and the connecting layer 2 is attached to the outside of the barrel substrate 1.

[0030] Additive 201 is added inside the connecting layer 2. Additive 201 is made of nano-sized alumina.

[0031] Additive 202 is added inside the connecting layer 2. Additive 202 is made of silane coupling agent.

[0032] Nano-sized alumina has high hardness and chemical stability, providing a solid foundation for coating adhesion, while the additive 202 silane coupling agent acts as a bridge, enhancing the bonding force between the coating and the barrel body and effectively preventing coating peeling.

[0033] like Figure 3 As shown, the protective outer layer 6 contains an antibacterial agent 602, which is made of nano-silver.

[0034] This utility model provides a corrosion-resistant structure for the coating of nuclear waste protection containers, and its specific working principle is as follows:

[0035] When the device is in operation, external corrosive substances first come into contact with the acrylic resin protective outer layer 6, which has high hardness and can effectively resist external scratches and wear. The added additive N-isopropylacrylamide (N-IOSAC) can inhibit the penetration of corrosive substances. At low temperatures, N-isopropylacrylamide absorbs moisture from the surrounding environment and swells, filling the pores inside the coating and making the coating structure denser, thus blocking the penetration of corrosive media such as moisture and oxygen. At high temperatures, the hydrophobic interactions between the N-isopropylacrylamide molecular chains increase, causing the molecular chains to collapse, and the polymer transforms from a hydrophilic... The coating transitions to a hydrophobic state, squeezing out moisture and creating a relatively dense structure that effectively blocks further penetration by corrosive media. When the outer protective layer 6 loses its effectiveness due to prolonged use or severe corrosion, the corrosive substances will then come into contact with the crystalline layer 4 (zirconia coating), whose dense crystalline structure effectively prevents penetration. Only then will it come into contact with the crystalline layer 5 (silicon nitride coating), which possesses excellent thermal and chemical stability, maintaining good performance even under high temperatures and corrosive environments. This achieves three layers of protection, effectively preventing corrosive substances from damaging the barrel substrate 1. Even if corrosive substances breach the protective layer, the additive 301 phosphate added inside the barrier layer 3 will gradually be released, forming a dense protective film on the surface to prevent further contact between the inner layer and the corrosive media. The additive 201 nano-alumina added to the innermost connecting layer 2 has high hardness and chemical stability, providing a solid adhesion base for the coating, while the additive 202 silane coupling agent acts as a bridge, enhancing the bond between the coating and the barrel body and effectively preventing coating peeling.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A corrosion-resistant structure for the coating of a nuclear waste protection container, comprising a container body substrate (1) and a protective outer layer (6), characterized in that: The protective outer layer (6) is located outside the barrel body substrate (1). Additive 4 (601) is added inside the protective outer layer (6). A crystal layer 2 (5) is provided on the side of the protective outer layer (6) close to the barrel body substrate (1). A crystal layer 1 (4) is provided on the side of the crystal layer 2 (5) close to the barrel body substrate (1). The protective outer layer (6) is made of acrylic resin. Additive 4 (601) is made of N-isopropylacrylamide. The crystal layer 1 (4) and crystal layer 2 (5) are respectively made of zirconium oxide material and silicon ammonia material.

2. The corrosion-resistant structure of the coating of the nuclear waste protection container according to claim 1, characterized in that: The crystal layer (4) has a barrier layer (3) on the side close to the barrel substrate (1), and the barrier layer (3) is made of epoxy resin.

3. The corrosion-resistant structure of the coating of the nuclear waste protection container according to claim 2, characterized in that: Additive 3 (301) is added inside the barrier layer (3), and additive 3 (301) is made of phosphate.

4. The corrosion-resistant structure of the coating of the nuclear waste protection container according to claim 3, characterized in that: The barrier layer (3) has a connecting layer (2) on the side close to the barrel substrate (1), and the connecting layer (2) is attached to the outside of the barrel substrate (1).

5. The corrosion-resistant structure of the coating of the nuclear waste protection container according to claim 4, characterized in that: Additive 1 (201) is added inside the connecting layer (2), and additive 1 (201) is made of nano-sized alumina.

6. The corrosion-resistant structure of the coating of the nuclear waste protection container according to claim 5, characterized in that: Additive 2 (202) is added inside the connecting layer (2), and additive 2 (202) is made of silane coupling agent.

7. The corrosion-resistant structure of the coating of the nuclear waste protection container according to claim 1, characterized in that: The protective outer layer (6) contains an antibacterial agent (602), which is made of nano-silver.

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