Metal panel, door body processing method and refrigerator

Abstract

The application provides a metal panel, a door body processing method and a refrigerator. The metal panel comprises a panel base plate and a film layer. The panel base plate is a composite plate formed by combining at least two metal materials. The film layer is covered on the panel base plate. The film layer is a titanium dioxide nanometer film prepared by anodic oxidation. The titanium dioxide nanometer film is prepared by anodic oxidation and has permanent antibacterial effect, so as to solve the problem of low antibacterial timeliness.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of materials, in particular to a metal panel, a door body processing method and a refrigerator. BACKGROUND

[0002] The metal panel of the refrigerator door body is an interface directly contacted with the outside world, and the metal panel takes a steel plate as a base material, which has high strength, good processing performance and stable physical properties.

[0003] The metal panel of the refrigerator door body takes a steel plate as a base material and performs a decoration treatment on the surface of the steel plate. Specifically, two surface treatment methods used in the market are PCM (Pre-Coated Metal) pre-coated steel plate and VCM (Veneer Coated Metal) film-coated steel plate. Both of the two treatment methods can provide good appearance effect for the refrigerator panel, wherein the PCM forms a coating layer by directly coating paint on the surface of the steel plate and performing a curing treatment, and the VCM forms a film by hot pressing a plastic film on the surface of the steel plate.

[0004] In order to enhance the antibacterial effect of the panel, an antibacterial agent is added in the coating layer or the film layer. However, when silver zinc ions are used as the antibacterial component, the antibacterial performance may gradually weaken over time, resulting in low antibacterial timeliness. SUMMARY

[0005] The present application provides a metal panel, a door body processing method and a refrigerator to solve the problem of low antibacterial timeliness.

[0006] In a first aspect, the present application provides a metal panel, comprising:

[0007] A panel base plate, the panel base plate is a composite plate generated by combining at least two metal materials;

[0008] A film layer, the film layer is covered on the panel base plate, the film layer is a titanium dioxide nano film, and the titanium dioxide nano film is prepared by anodic oxidation.

[0009] In some possible embodiments, the panel base plate comprises:

[0010] A first metal layer, the material of the first metal layer is steel material, and the steel material comprises cold-rolled steel;

[0011] A second metal layer, the second metal layer is covered on the first metal layer, the material of the second metal layer is titanium, and the second metal layer is covered with the film layer.

[0012] In some possible embodiments, the metal panel has a first thickness, the first metal layer has a thickness of 50-90% of the first thickness, the second metal layer has a thickness of 10-50% of the first thickness, and the film layer has a thickness of 10-50 nm.

[0013] In some possible embodiments, the method further comprises:

[0014] an ultraviolet excitation layer coated on the surface of the film layer, the material of the ultraviolet excitation layer being zinc sulfide suspension or silver nanoparticle dispersion.

[0015] In a second aspect, the application provides a door processing method, comprising:

[0016] preparing a panel substrate, the panel substrate being a composite plate formed by combining at least two metal materials;

[0017] preparing a film layer, the film layer being a titanium dioxide nanofilm prepared by anodic oxidation;

[0018] covering the film layer on the panel substrate to form a metal panel;

[0019] processing the metal panel into a door body by a roll forming process.

[0020] In some possible embodiments, the panel substrate comprises a first metal layer and a second metal layer.

[0021] The preparing of the panel substrate comprises:

[0022] preparing the panel substrate by a roll composite process of the first metal layer and the second metal layer, the material of the first metal layer being steel material, the steel material comprising cold-rolled steel, and the material of the second metal layer being titanium.

[0023] In some possible embodiments, the preparing of the film layer comprises:

[0024] performing an anodic oxidation treatment on the second metal layer to form a titanium dioxide nanofilm, the temperature of the anodic oxidation being 200-300°C.

[0025] In some possible embodiments, the performing of the anodic oxidation treatment on the second metal layer to form a titanium dioxide nanofilm comprises:

[0026] preparing an electrolyte containing rare earth ions, the electrolyte containing rare earth ions being a phosphoric acid or sulfuric acid solution added with cerium nitrate or lanthanum nitrate, the concentration of the cerium nitrate or lanthanum nitrate being 0.01-0.1 mol / L;

[0027] determining an anode and a cathode, the anode being the second metal layer, and the cathode being stainless steel or platinum.

[0028] The electrolyte containing rare earth ions is added into the anode oxidation tank to form the titanium dioxide nanometer film.

[0029] In some possible embodiments, the covering the film layer on the panel base layer to form the metal panel further includes:

[0030] The photosensitive agent solution is prepared, and the photosensitive agent solution is a zinc sulfide suspension or a silver nanoparticle dispersion;

[0031] The film layer is covered on the panel base layer to form a panel substrate.

[0032] The photosensitive agent solution is spin-coated on the panel substrate to form a metal panel, and the spin-coating speed is 2500-3500 rpm and the spin-coating time is 20-40 s.

[0033] In a third aspect, the application provides a refrigerator, comprising: a cabinet and a door body, the cabinet is connected with the door body, and the door body is a door body processed by the door body processing method.

[0034] According to the above technical solution, the application provides a metal panel, a door body processing method and a refrigerator. The metal panel comprises a panel substrate and a film layer. The panel substrate is a composite board formed by combining at least two metal materials. The film layer is covered on the panel substrate, and the film layer is a titanium dioxide nanometer film prepared by anodic oxidation. The titanium dioxide nanometer film is prepared by anodic oxidation and has a permanent antibacterial effect, thereby solving the problem of low antibacterial timeliness. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the application, the drawings required in the embodiments will be briefly introduced below. Obviously, other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0036] Figure 1 The structural schematic diagram of the metal panel provided by the embodiment of the application is shown.

[0037] Figure 2 The flowchart of the door body processing method provided by the embodiment of the application is shown.

[0038] ILLUSTRATIVE DESCRIPTION

[0039] In the drawings, 100 is a first metal layer, 200 is a second metal layer, and 300 is a film layer. DETAILED DESCRIPTION

[0040] The embodiments will be described in detail below with reference to examples thereof as illustrated in the accompanying drawings. Descriptions below refer to the accompanying drawings in which like numbers represent the same or similar elements, unless otherwise indicated. The implementations described in the following embodiments do not represent all implementations consistent with the present application. Rather, they are merely examples of systems and methods consistent with some aspects of the present application as detailed in the claims.

[0041] PCM precoated steel sheet and VCM film-coated steel sheet are two surface treatment methods. PCM precoated steel sheet is formed by precoating a layer of paint containing pigments and protective ingredients on the surface of the steel sheet and then curing it by baking. It has low cost, rich color and easy processing. VCM film-coated steel sheet has a thin film with patterns or colors attached to the surface of the steel sheet through high temperature and high pressure, which can provide more delicate and rich visual effects and higher weather resistance. Metal panels also have functional properties such as antibacterial, wear-resistant, scratch-resistant, fingerprint-resistant and pollution-resistant. Among them, the realization of antibacterial function is achieved by adding antibacterial agents such as silver zinc ion antibacterial agents in the coating or film layer. However, when silver zinc ions are used as antibacterial ingredients, the antibacterial performance may gradually weaken over time, resulting in low antibacterial timeliness.

[0042] To solve the above problems, see Figure 1 Some embodiments of the present application provide a metal panel, comprising: a panel substrate, the panel substrate being a composite plate formed by combining at least two metal materials.

[0043] In some embodiments, the panel substrate includes a first metal layer 100 and a second metal layer 200, the material of the first metal layer 100 is steel, and the steel includes cold-rolled steel; the second metal layer 200 is covered on the first metal layer 100, and the material of the second metal layer 200 is titanium.

[0044] The cold-rolled steel is made of steel through a cold rolling process, which is carried out at room temperature, so that the steel has higher strength and more accurate size. Cold-rolled steel has high strength and hardness, while maintaining good surface quality and dimensional accuracy. Titanium is a silvery white light metal with good corrosion resistance, high strength and low density.

[0045] Rolling composite process is an advanced material processing technology that combines two or more different metals through plastic deformation. Rolling composite process utilizes the plastic deformation ability of metals under certain conditions, such as high temperature and high pressure, to form a metallurgical bond between the two metals at the interface, thereby obtaining a composite material with unique properties. Rolling composite process is achieved by rolling metal sheets at high temperature and high pressure to produce plastic deformation on the contact surface of two or more layers of metal, thereby realizing the metallurgical bonding between the interfaces. Rolling composite process can make the composite material not only retain the advantages of each single material, but also overcome the shortcomings of single material.

[0046] In some embodiments, the thickness of the metal panel is a first thickness, the thickness of the first metal layer 100 is 50-90% of the first thickness, the thickness of the second metal layer 200 is 10-50% of the first thickness, and the thickness of the film layer 300 is 10-50 nm.

[0047] The first thickness is 0.3-0.5 mm, for example, 0.3, 0.35, 0.4, 0.45, 0.5. Within this thickness range, the metal panel can provide better strength and toughness to ensure the structural stability of the refrigerator door body, while being able to withstand a certain degree of external impact. Although the metal has good thermal conductivity, at the first thickness, the metal panel combined with the heat preservation layer inside the refrigerator can effectively reduce the loss of cold air and improve the heat preservation effect of the refrigerator.

[0048] The thickness of the cold-rolled steel is 50-90% of the first thickness, for example, 50%, 60%, 70%, 80%, 90%. A larger proportion of cold-rolled steel can provide better mechanical strength to ensure that the panel does not easily deform during use, especially when the door body is foamed, it can withstand the pressure of the internal foam without bending. Although the cold-rolled steel layer accounts for a large proportion, the overall panel thickness is only 0.3-0.5 mm, so it can still maintain the characteristics of lightweight and be suitable for use in refrigerators.

[0049] The thickness of the titanium metal is 10-50% of the first thickness, for example, 10%, 20%, 30%, 40%, 50%. Titanium metal has lower density and higher strength, which can reduce weight while ensuring the strength of the panel, making the metal panel more portable. Although the titanium metal layer accounts for a small proportion, titanium metal has excellent corrosion resistance and can maintain good condition even in humid environments, resisting corrosion from sweat, moisture and other media, extending the service life of the refrigerator. In addition, the titanium metal layer can also give the refrigerator door body different textures and appearances to meet the different needs of customers and improve user experience.

[0050] The thickness of the carbon dioxide nanometer film is 10-50 nm, for example, 10 nm, 15 nm, 20 nm, 25 nm, 30 nm, 35 nm, 40 nm, 45 nm, 50 nm. TiO2 has photocatalytic activity and can decompose organic pollutants under light conditions, playing a self-cleaning role. The TiO2 nanometer film can inhibit bacterial growth and provide antibacterial effect. The dense TiO2 film increases the hardness of the surface and reduces scratches and wear. In addition, the film layer 300 is thin and almost does not affect the visual effect while providing protection.

[0051] The second metal layer 200 is covered with a film layer 300, which is a titanium dioxide nanometer film prepared by anodic oxidation. The titanium dioxide nanometer film is a nanometer-level film composed of titanium dioxide (TiO2) and has good optical performance, weather resistance and self-cleaning function. The titanium dioxide nanometer film has the functions of antibiosis, air purification, pollution resistance and carbon dioxide capture.

[0052] Anodic oxidation treatment is an electrochemical method that causes the surface of titanium metal to undergo oxidation reaction by applying voltage in an electrolyte to form a dense titanium dioxide (TiO2) film. This process is carried out in a solution containing acidic or basic substances, and the electrolyte includes sulfuric acid, phosphoric acid, oxalic acid, etc.

[0053] For example, a titanium metal layer prepared by cleaning and pretreatment is ensured to be clean and free of oil stains, and a suitable electrolyte solution is selected according to the characteristics and thickness of the film layer 300 to be formed. The titanium metal is used as an anode and is immersed in the electrolyte and a certain voltage is applied. On the anode, the titanium metal loses electrons and combines with oxygen ions to form a titanium dioxide film. The thickness and characteristics of the film layer 300 are controlled by adjusting parameters such as voltage, current density, temperature and treatment time. After the treatment is completed, the film layer 300 needs to be cleaned and dried, and heat treatment can also be performed to improve the adhesion and hardness of the film layer 300.

[0054] The TiO2 film formed by anodic oxidation has a porous structure, and the pore size can be controlled by adjusting the process parameters. By changing the electrolyte composition or treatment conditions, the film layer 300 can exhibit different colors due to light interference effects. The titanium dioxide film has good corrosion resistance, photocatalytic activity, antibacterial performance and biocompatibility.

[0055] In order to improve the timeliness of antibiosis and activate the antibacterial effect of titanium dioxide, in some embodiments, an ultraviolet excitation layer is coated on the surface of the film layer 300, and the material of the ultraviolet excitation layer is zinc sulfide suspension or silver nanoparticle dispersion. By applying different material layers, the photocatalytic activity and antibacterial effect of titanium dioxide under natural light can be improved.

[0056] The metal panel provided in the embodiment has high strength, and when the door body is foamed, a felt reinforcing plate does not need to be added on the back of the door shell, thereby reducing materials and processes. The surface is a titanium dioxide nanometer film, the titanium dioxide oxidation film itself has the functions of antibiosis, air purification, pollution resistance and carbon dioxide capture, and is prepared by anodic oxidation and has a certain thickness, better antibacterial function and permanent antibacterial effect. The titanium dioxide nanometer film also has the texture of real metal, which increases the texture of the door body.

[0057] Based on the above metal panel, seeFigure 2 The application also provides a door processing method, comprising:

[0058] S100: preparing a panel substrate.

[0059] The panel substrate is a composite plate formed by combining at least two metal materials; the panel substrate comprises a first metal layer 100 and a second metal layer 200; the panel substrate is prepared by a rolling composite process of the first metal layer 100 and the second metal layer 200; the material of the first metal layer 100 is steel, and the steel comprises cold-rolled steel; and the material of the second metal layer 200 is titanium.

[0060] The cold-rolled steel and the titanium metal are selected as base materials, combined by a rolling composite process to form a composite plate. The thickness of the cold-rolled steel layer is ensured to be 50%-90%, and the thickness of the titanium metal layer is ensured to be 10%-50%. The titanium metal layer in the composite plate is subjected to an anodization treatment to form a titanium dioxide nanofilm, and the thickness of the film layer 300 is controlled to be between 10-50 nm.

[0061] The step of combining the cold-rolled steel and the titanium metal by the rolling composite process is exemplarily that the surfaces of the cold-rolled steel and the titanium metal are subjected to cleaning and polishing treatment to remove the oxide skin, grease and other impurities on the surfaces, so that the surfaces of the two metal layers are clean and have good flatness. The treated cold-rolled steel and titanium metal are stacked, the cold-rolled steel is used as a base material, and the titanium metal is used as a cover layer.

[0062] According to needs, the materials can be subjected to preheating treatment before or after stacking. The preheating is helpful to reduce the friction between the interfaces and promote the diffusion of atoms between the metals, so as to improve the bonding strength. The stacked materials are sent into a rolling mill for rolling. In the rolling process, the materials are compressed under high pressure, so that the interface between the two metal layers is plastically deformed to form a close contact. After rolling, the materials need to be cooled and can be subjected to annealing treatment to eliminate internal stress and improve the mechanical properties of the materials.

[0063] S200: preparing a film layer.

[0064] The film layer 300 is a titanium dioxide nanofilm prepared by anodization. In some embodiments, the titanium dioxide nanofilm is formed by anodization treatment on the second metal layer 200, and the anodization temperature is 200-300°C.

[0065] Exemplarily, the titanium substrate (the second metal layer 200) is cleaned with solvents such as acetone and ethanol to remove grease and impurities, and then washed with deionized water and dried. An anodization solution (for example, 0.5M H3PO4) is prepared, the titanium sheet is used as an anode, and is placed in an electrolytic cell with a platinum sheet or a stainless steel sheet as a cathode. The anodization voltage (20-60V) and the current density (0.5-2.0A / dm2) are controlled. After the anodization treatment, the titanium sheet is taken out, washed with deionized water and dried.2 ), and an anodization treatment is performed at a temperature of 200-300°C for 30 minutes to 1 hour. The titanium sheet is removed, washed with deionized water, and dried to form a titanium dioxide nanofilm.

[0066] S300: The film layer is covered on the panel base layer to form a metal panel.

[0067] Titanium dioxide itself is a highly efficient photocatalytic material that can generate electron-hole pairs under ultraviolet light irradiation. These electrons and holes can react with the surrounding water and oxygen to generate free radicals with strong oxidizing ability, thereby decomposing organic pollutants and killing bacteria. However, pure titanium dioxide is only active under ultraviolet light (wavelength < 387 nm), thus limiting its use under daily visible light conditions. In some embodiments, a photosensitizer solution is prepared, which is a zinc sulfide suspension or a silver nanoparticle dispersion; the film layer 300 is covered on the panel base layer to form a panel substrate; and the photosensitizer solution is spin-coated on the panel substrate to form a metal panel, with a spin-coating speed of 2500-3500 rpm and a time of 20-40 s.

[0068] By incorporating rare earth elements, cerium (Ce) and lanthanum (La), the light response range of titanium dioxide can be expanded, and even under visible light conditions, a photocatalytic effect can be generated.

[0069] Among them, cerium as a multi-valence rare earth element can effectively inhibit the recombination of electron-hole pairs (i.e., when the generated electrons and holes quickly recombine, the photocatalytic efficiency decreases). The multi-valence of cerium helps to capture electrons and holes, prolonging the lifetime of free radicals, thereby improving the photocatalytic efficiency. The doping of lanthanum can change the crystal structure of titanium dioxide, enabling it to absorb light in a wider spectrum. In addition, lanthanum can also improve the reactivity of the titanium dioxide surface, promoting the generation of free radicals in the photocatalytic reaction.

[0070] The photocatalytic properties of titanium dioxide impart antibacterial ability, as the free radicals it generates can destroy the cell walls, cell membranes, and DNA of bacteria and other biological macromolecules. Rare earth doping can extend the active period of the photocatalytic reaction, allowing titanium dioxide to maintain its antibacterial effect for a longer period of time, which is effective for use in weak light or indoor environments. The high-energy free radicals generated after doping with rare earth elements are more active and can quickly and effectively kill bacteria and other microorganisms. The incorporation of rare earth elements not only enhances the photocatalytic and antibacterial properties, but also improves the overall structure and electronic properties of the titanium dioxide film.

[0071] The rare earth doping can improve the conductivity of the titanium dioxide film, so that the photo-generated electrons can be transferred to the film surface more quickly, thereby accelerating the reaction rate. The rare earth elements can also slow down the recombination of electron-hole pairs, further improving the photocatalytic efficiency. The incorporation of rare earth elements helps to stabilize the crystal structure of titanium dioxide, so that it still has good photocatalytic and antibacterial functions under high temperature or harsh environment.

[0072] For example, an electrolyte containing rare earth ions is prepared, the electrolyte is a phosphoric acid or sulfuric acid solution, and an appropriate amount of cerium or lanthanum salt such as cerium nitrate or lanthanum nitrate is added. A titanium sheet is used as the anode (positive electrode), and a stainless steel sheet or a platinum sheet is used as the cathode (negative electrode). The electrolyte is poured into the anodizing tank, ensuring that the electrodes are completely immersed. The voltage is adjusted to an appropriate value, such as 20-60V, and the current density is controlled at 0.5-2.0A / dm 2 . Anodizing is performed, and the duration is generally 30 minutes to 1 hour. The reaction temperature is controlled between 200-300°C, and the temperature is maintained constant.

[0073] During the anodizing process, the rare earth ions migrate through the electrolyte and are embedded in the formed titanium dioxide nanofilm. A multi-step anodizing method can be used, i.e., first performing preliminary anodizing in a solution without rare earth doping, and then moving the semi-finished product into a solution containing rare earth ions for secondary anodizing.

[0074] After anodizing is completed, the titanium sheet is taken out and rinsed thoroughly with deionized water to remove the surface residual electrolyte. Drying is performed using hot air or a vacuum drying device. The oxide film is subjected to heat treatment (e.g., annealing at 300°C to 500°C) to improve the crystallinity and stability of the film, and at the same time, promote the uniform distribution and shaping of the rare earth elements, thereby improving the doping effect.

[0075] S400: The metal panel is processed by roll forming to form a door body.

[0076] Roll forming is a processing method that uses one or more pairs of rotating rollers to plastically deform metal sheets. By adjusting the gap and pressure between the rollers, the thickness and shape of the sheet can be changed. During this process, a specific roller surface pattern can also be used to form a texture on the sheet. By roll forming, a textured touch can be formed on the surface of the panel. For example, a metal panel with a titanium dioxide nanofilm is fed into a roll forming machine, and the panel is gradually bent into the desired shape, such as a refrigerator door body, by a pre-set roller set.

[0077] Cold-rolled steel as a base material can provide good mechanical strength and rigidity, and can withstand external pressure and impact without easy deformation. The titanium metal layer not only increases the corrosion resistance of the material, but also enhances the structural strength of the panel due to the high strength ratio of titanium itself. The titanium dioxide nanofilm can provide additional protection against corrosion and wear.

[0078] The combination of the three materials achieves a good balance between strength and toughness of the entire panel. The combination of cold-rolled steel and titanium metal layers is tightly connected through a rolling composite process. This structural design not only makes the panel have high rigidity, but also can absorb and disperse stress to some extent, reducing the possibility of deformation caused by external forces. During the manufacturing process, the hardness and uniformity of the panel surface can be further improved through techniques such as anodic oxidation treatment and pressure roller process.

[0079] The metal panel provided in the embodiment can make the door body maintain good shape stability and mechanical properties without additional support during foaming, for example, by adding a felt reinforcing plate on the back of the door shell.

[0080] Based on the above-mentioned door body processing method, the refrigerator provided in some embodiments of the present application further comprises a cabinet and a door body, wherein the cabinet is connected with the door body, and the door body is a door body processed by the door body processing method.

[0081] It can be understood that the refrigerator provided in the embodiments of the present application is a refrigeration device, and at least includes a refrigeration system, a cooling system, a control system and a cabinet in order to achieve refrigeration and operation. The refrigeration system is used to generate a refrigeration effect, the cooling system is used to maintain a low-temperature environment, the control system is used to control the temperature and humidity in the refrigerator, and the cabinet is used to provide a storage space. It can be understood that the refrigeration system, the cooling system and the control system include specific components that can achieve the above-mentioned functions.

[0082] In some embodiments, the refrigeration system includes a compressor, a condenser, an evaporator and a throttling device. The compressor is used to compress refrigerant gas to increase pressure and temperature, thereby driving the refrigerant to flow in the system. During the compression process, the refrigerant changes from low-pressure high-temperature gas to high-pressure high-temperature gas, thereby generating a refrigeration effect. The condenser is used to cool the high-temperature high-pressure gas discharged by the compressor into a liquid state. The refrigerant gas is converted into a liquid state by releasing heat through the heat sink, and is ready for the next step of the refrigeration cycle. The evaporator is used to absorb heat in the refrigeration system. The refrigerant evaporates from a liquid state to a gaseous state in the evaporator, absorbs heat from the surrounding environment, thereby achieving the purpose of reducing the temperature inside the refrigerator. The throttling device can include an expansion valve and a capillary tube, which is used to adjust the flow of refrigerant, reduce its pressure, and make it into a low-temperature low-pressure gas-liquid mixed state, ready for entering the evaporator.

[0083] In some embodiments, the cooling system includes a fan connected to the evaporator. The fan circulates air in the compartments, such as the freezer compartment and the refrigerator compartment, transfers heat to the evaporator, and helps maintain a low-temperature environment inside the refrigerator.

[0084] It should be noted that the above examples are only a simple division of the functions of the refrigerator, and do not limit the specific structure of the refrigerator in the embodiments of the present application.

[0085] The application provides a metal panel, a door body processing method and a refrigerator. The metal panel comprises a panel substrate and a film layer 300. The panel substrate is a composite board generated by combining at least two metal materials. The film layer 300 is covered on the panel substrate, and the film layer 300 is a titanium dioxide nano film prepared by anodic oxidation. The titanium dioxide nano film prepared by anodic oxidation has a permanent antibacterial effect, so as to solve the problem of low antibacterial timeliness.

[0086] The similar parts among the embodiments provided in the application can be referred to each other. The specific embodiments provided above are only some examples under the general concept of the application, and do not limit the protection scope of the application. Any other embodiments extended according to the application scheme without creative labor belong to the protection scope of the application.

Claims

1. A metal panel, characterized in that, Comprising: a panel substrate, the panel substrate being a composite plate generated by combining at least two metal materials; the panel substrate comprising: a first metal layer, the material of the first metal layer being steel material, the steel material comprising cold-rolled steel; a second metal layer, the second metal layer being covered on the first metal layer, the material of the second metal layer being titanium, the second metal layer being covered with a film layer; a film layer, the film layer being covered on the panel substrate, the film layer being a titanium dioxide nanometer film prepared by anodic oxidation; the thickness of the metal panel being a first thickness, the thickness of the first metal layer being 50-90% of the first thickness, the thickness of the second metal layer being 10-50% of the first thickness, and the thickness of the film layer being 10-50nm.

2. The metal panel of claim 1, wherein, Further comprising: an ultraviolet excitation layer, the ultraviolet excitation layer being coated on the surface of the film layer, the material of the ultraviolet excitation layer being zinc sulfide suspension or silver nanoparticle dispersion.

3. A method of processing a door body, characterized by, Applied to the metal panel of any one of claims 1-2, comprising: preparing a panel substrate, the panel substrate being a composite plate generated by combining at least two metal materials; preparing a film layer, the film layer being a titanium dioxide nanometer film prepared by anodic oxidation; covering the film layer on the panel base layer to form a metal panel; rolling the metal panel by a rolling process to form a door body.

4. The door processing method according to claim 3, wherein The panel substrate comprises a first metal layer and a second metal layer; The preparation of the panel substrate comprises: preparing a panel substrate by rolling composite process of the first metal layer and the second metal layer, the material of the first metal layer being steel material, the steel material comprising cold-rolled steel, and the material of the second metal layer being titanium.

5. The door processing method according to claim 4, wherein The preparation of the film layer comprises: anodic oxidation treatment on the second metal layer to form a titanium dioxide nanometer film, the temperature of anodic oxidation being 200-300℃.

6. The door processing method according to claim 5, wherein The anodic oxidation treatment on the second metal layer to form a titanium dioxide nanometer film comprises: preparing an electrolyte containing rare earth ions, the electrolyte containing rare earth ions being a phosphoric acid or sulfuric acid solution added with cerium nitrate or lanthanum nitrate, the concentration of the cerium nitrate or lanthanum nitrate being 0.01-0.1mol / L; determining an anode and a cathode, the anode being the second metal layer, and the cathode being stainless steel or platinum; adding the electrolyte containing rare earth ions into an anodic oxidation tank to form a titanium dioxide nanometer film.

7. The door processing method according to claim 3, wherein The covering of the film layer on the panel base layer to form a metal panel further comprises: preparing a photosensitizer solution, the photosensitizer solution being zinc sulfide suspension or silver nanoparticle dispersion; covering the film layer on the panel base layer to form a panel substrate; spin coating the photosensitizer solution on the panel substrate to form a metal panel, the spin coating speed being 2500-3500rpm, and the time being 20-40s.

8. A refrigerator characterized by comprising: Comprising: a box body and a door body, the box body being connected with the door body, and the door body being a door body processed by the door body processing method of any one of claims 3-7.

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