Composite coating forming method, composite coating, control valve, engine and vehicle

Abstract

The invention discloses a composite coating forming method, a composite coating, a control valve, an engine and a vehicle. The composite coating layer forming method comprises the following steps: forming a first organic coating layer on a substrate; forming an intermediate oxide layer on the first organic coating layer; a second organic coating layer is formed on the intermediate oxide layer. Therefore, corrosive substances generated by corrosion of the chlorine-containing liquid to the middle oxide layer can be utilized to realize a self-sealing function on pores of the first organic coating and the second organic coating on the two sides, so that the service life of the coatings is prolonged, the reliability of the coatings is improved, and corrosion to a base material is further avoided. When the composite coating prepared through the composite coating forming method is applied to the control valve, the problems of valve body clamping stagnation, failure and the like can be avoided.

Description

Technical Field

[0001] The present application relates to the technical field of protective coatings, and in particular to a method for forming a composite coating, a composite coating, a control valve, an engine, and a vehicle. Background Art

[0002] With the development of lightweighting in the automotive industry, a large number of lightweight materials such as aluminum alloys are widely used. However, components working in high-humidity and chlorine-containing environments, such as the flow path inside the engine EGR valve (Exhaust Gas Recirculation Valve), are prone to corrosion of the aluminum alloy, leading to problems such as valve body sticking and failure. Summary of the Invention

[0003] The embodiments of the present application provide a composite coating forming method, a composite coating, a control valve, an engine and a vehicle to solve at least one of the above-mentioned technical problems.

[0004] The method for forming a composite coating according to an embodiment of the present application includes:

[0005] forming a first organic coating on a substrate;

[0006] forming an intermediate oxide layer on the first organic coating layer;

[0007] A second organic coating is formed on the intermediate oxide layer.

[0008] In certain embodiments, before forming the first organic coating on the substrate, the composite coating forming method further comprises:

[0009] The surface of the substrate is subjected to phosphating treatment.

[0010] In certain embodiments, the first organic coating is a modified polytetrafluoroethylene coating.

[0011] In certain embodiments, the first organic coating layer uses a silane coupling agent as a modifier.

[0012] In certain embodiments, forming a first organic coating on a substrate comprises:

[0013] The first organic coating is coated on the surface of the substrate by a thermal spraying process.

[0014] In certain embodiments, the thickness of the first organic coating layer is in the range of 5 to 10 μm.

[0015] In certain embodiments, the intermediate oxide layer is an aluminum oxide film.

[0016] In certain embodiments, forming an intermediate oxide layer on the first organic coating layer comprises:

[0017] The intermediate oxide layer is formed on the first organic coating layer by a physical vapor deposition process.

[0018] In certain embodiments, the thickness of the intermediate oxide layer is in the range of 0.5 to 1 μm.

[0019] In certain embodiments, a thickness ratio of the first organic coating layer to the intermediate oxide layer is in a range of 5:1 to 20:1.

[0020] In certain embodiments, the second organic coating is a polytetrafluoroethylene coating.

[0021] In certain embodiments, forming a second organic coating on the intermediate oxide layer comprises:

[0022] The second organic coating is coated on the surface of the intermediate oxide layer by a thermal spraying process.

[0023] In certain embodiments, the second organic coating layer has a thickness ranging from 5 to 10 μm.

[0024] In certain embodiments, a thickness ratio of the second organic coating layer to the intermediate oxide layer is in a range of 5:1 to 20:1.

[0025] The composite coating of the embodiment of the present application is prepared by using the composite coating forming method of any of the above embodiments.

[0026] The control valve according to the embodiment of the present application includes:

[0027] a valve body, wherein the valve body is formed with a flow channel;

[0028] The composite coating is formed on the inner wall of the flow channel.

[0029] The engine according to the embodiment of the present application includes the above-mentioned control valve.

[0030] A vehicle according to an embodiment of the present application includes the above-mentioned engine.

[0031] The composite coating formation method, composite coating, control valve, engine, and vehicle according to the embodiments of the present application form a first organic coating on a substrate, an intermediate oxide layer on the first organic coating, and a second organic coating on the intermediate oxide layer. In this way, the corrosive products produced by the corrosion of the intermediate oxide layer by a chlorine-containing liquid can be used to achieve a self-sealing function for the pores of the first organic coating and the second organic coating on both sides, thereby improving the service life and reliability of the coating and further avoiding corrosion of the substrate. When the composite coating prepared by the composite coating formation method according to the embodiments of the present application is applied to a control valve, it can avoid problems such as valve body jamming and failure.

[0032] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0034] Figure 1 is a schematic flow chart of a method for forming a composite coating according to certain embodiments of the present application;

[0035] Figure 2 is a schematic diagram of the structure of a composite coating in some embodiments of the present application that is not corroded;

[0036] Figure 3 This is a schematic diagram of the structure of a composite coating that self-seals holes after being corroded in certain embodiments of the present application;

[0037] Figure 4 is a schematic flow chart of a method for forming a composite coating according to certain embodiments of the present application;

[0038] Figure 5 is a schematic flow chart of a method for forming a composite coating according to certain embodiments of the present application;

[0039] Figure 6 is a schematic structural diagram of a control valve according to certain embodiments of the present application;

[0040] Figure 7 is a schematic structural diagram of an engine according to certain embodiments of the present application;

[0041] Figure 8 It is a schematic structural diagram of a vehicle according to certain embodiments of the present application.

[0042] Description of reference numerals:

[0043] Composite coating 100, first organic coating 10, intermediate oxide layer 20, second organic coating 30, substrate 200, control valve 300, valve body 301, flow channel 3011, valve 302, motor 303, valve stem 304, valve base 305, guide mechanism 306, air inlet 307, exhaust port 308, engine 400, vehicle 1000. DETAILED DESCRIPTION

[0044] The following further describes the embodiments of the present application in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions. Furthermore, the embodiments of the present application described below in conjunction with the accompanying drawings are exemplary and are intended only to explain the embodiments of the present application and are not to be construed as limiting the present application.

[0045] See also Figures 1 to 3 The composite coating forming method according to the embodiment of the present application comprises:

[0046] 010: forming a first organic coating layer 10 on the substrate 200;

[0047] 020: forming an intermediate oxide layer 20 on the first organic coating layer 10;

[0048] 030 : forming a second organic coating layer 30 on the intermediate oxide layer 20 .

[0049] The composite coating formation method according to the embodiment of the present application forms a first organic coating 10 on a substrate 200, forms an intermediate oxide layer 20 on the first organic coating 10, and forms a second organic coating 30 on the intermediate oxide layer 20. In this way, the corrosion products generated by the corrosion of the intermediate oxide layer 20 by the chlorine-containing liquid can be used to achieve a self-sealing function for the pores of the first organic coating 10 and the second organic coating 30 on both sides, thereby improving the service life and reliability of the coating and further avoiding corrosion of the substrate 200. When the composite coating 100 prepared by the composite coating formation method according to the embodiment of the present application is applied to a control valve 300, problems such as valve body seizure and failure can be avoided.

[0050] Specifically, the substrate 200 can be a lightweight material such as an aluminum alloy or a magnesium alloy. In the embodiment of the present application, the substrate 200 is described as an aluminum alloy. The substrate 200 includes an upper surface and a lower surface facing each other. 010 A first organic coating 10 is formed on the upper surface of the substrate 200. The first organic coating 10 includes an upper surface and a lower surface facing each other. The lower surface of the first organic coating 10 is bonded to the upper surface of the substrate 200. 020 An intermediate oxide layer 20 is formed on the upper surface of the first organic coating 10. The intermediate oxide layer 20 includes an upper surface and a lower surface facing each other. The lower surface of the intermediate oxide layer 20 is bonded to the upper surface of the first organic coating 10. 030 A second organic coating 30 is formed on the upper surface of the intermediate oxide layer 20. The second organic coating 30 includes an upper surface and a lower surface facing each other. The lower surface of the second organic coating 30 is bonded to the upper surface of the intermediate oxide layer 20. Among them, the first organic coating 10 and the second organic coating 30 can be made of hydrophobic and chlorine-resistant materials to protect the substrate 200.

[0051] The working process of the composite coating 100 in the embodiment of the present application is as follows: Figure 2When the composite coating 100 is not corroded, no matter how the first organic coating 10, the intermediate oxide layer 20, and the second organic coating 30 are coated, certain pores will be generated, and the pores allow the corrosive liquid to enter and cause corrosion (such as Figure 2 Refer to Figure 3 When composite coating 100 corrodes, the chlorine-containing liquid reaches the intermediate oxide layer 20 through the pores of the second organic coating 30 and interacts with the intermediate oxide layer 20, corroding the intermediate oxide layer 20 and producing corrosive products. These corrosive products then seal the pores of the first organic coating 10 and the second organic coating 30 above and below the intermediate oxide layer 20, thereby achieving the self-sealing function of composite coating 100. After the pores of the first organic coating 10 and the second organic coating 30 are sealed, the chlorine-containing liquid can no longer pass through the first organic coating 10, the intermediate oxide layer 20, and the second organic coating 30 to reach the surface of the substrate 200, thereby preventing corrosion of the substrate 200.

[0052] In related technologies, graphene sealants are used for pore sealing. The preparation of graphene sealants is achieved by impregnating the surface with graphene sealing liquid, dripping and drying, blowing with high-pressure air, and then drying and curing at 70°C to 100°C. This method is not only complex, but also uses expensive graphene materials and cannot guarantee the sealing effect over long-term use.

[0053] In the embodiment of the present application, the corrosion products generated by the corrosion of the intermediate oxide layer 20 by the chlorine-containing liquid are used to realize the self-sealing function of the pores of the first organic coating 10 and the second organic coating 30 on both sides. There is no need to use a sealant, which can save material costs; there is no need for post-sealing treatment, and the operation is simple; the sealing rate is high, which can improve the service life and reliability of the coating.

[0054] See also Figure 4 In certain embodiments, before forming the first organic coating 10 (ie, 010) on the substrate 200, the composite coating forming method further includes:

[0055] 040: Perform phosphating treatment on the surface of the substrate 200.

[0056] Specifically, the phosphating treatment of the surface of the substrate 200 can not only remove the oxide layer and oil stains on the surface of the substrate 200, but also roughen the surface, improve the adhesion of the coating, and thus ensure the bonding strength between the subsequent first organic coating 10 and the substrate 200. In the embodiment of the present application, the phosphating treatment is specifically performed on the upper surface of the substrate 200.

[0057] In some embodiments, the first organic coating 10 is a modified polytetrafluoroethylene (PTFE) coating. The PTFE coating is hydrophobic and chlorine-resistant, and can protect the substrate 200.

[0058] In certain embodiments, the first organic coating layer 10 uses a silane coupling agent (KH-570) as a modifier.

[0059] Since the first organic coating 10 is in direct contact with the upper surface of the substrate 200, the first organic coating 10 should have high permeability and strong bonding strength. In the embodiment of the present application, the first organic coating 10 uses a silane coupling agent as a modifier. The silane coupling agent can form a chemical bond between the inorganic material and the organic material, thereby improving the adhesion of the coating.

[0060] See also Figure 5 In certain embodiments, forming a first organic coating 10 (ie, 010) on a substrate 200 includes:

[0061] 011: Coating the first organic coating 10 on the surface of the substrate 200 by a thermal spraying process.

[0062] Specifically, the first organic coating layer 10 may be coated on the upper surface of the substrate 200 by a thermal spraying process to ensure the bonding force between the first organic coating layer 10 and the substrate 200 .

[0063] In related art, when using graphene sealants for pore sealing, thermal spraying is not possible due to the extremely high melting point of graphene. Consequently, the bonding strength of the graphene sealant in this solution is difficult to guarantee, and its sealing effect cannot be guaranteed over long-term use. In the embodiments of the present application, however, the first organic coating 10 can be a modified polytetrafluoroethylene coating, which can be applied to the upper surface of the substrate 200 via a thermal spraying process. This ensures the bonding strength between the first organic coating 10 and the substrate 200, thereby improving the coating's service life and reliability.

[0064] In certain embodiments, the thickness of the first organic coating layer 10 is in the range of 5 to 10 μm.

[0065] In other words, the thickness of the first organic coating 10 can be any value between 5 and 10 μm. For example, the thickness of the first organic coating 10 can be 5 μm, 5.5 μm, 6 μm, 6.5 μm, 7 μm, 7.5 μm, 8 μm, 8.5 μm, 9 μm, 9.5 μm, 10 μm, etc. When the thickness of the first organic coating 10 falls within the above range, the first organic coating 10 can be prevented from being too thick or too thin, thereby ensuring the performance of the first organic coating 10.

[0066] In some embodiments, the intermediate oxide layer 20 is an aluminum oxide (Al2O3) film. The aluminum oxide film has the characteristics of high temperature oxidation resistance, so that the intermediate oxide layer 20 has good corrosion resistance and stability.

[0067] See also Figure 5 In certain embodiments, forming an intermediate oxide layer 20 (ie, O20) on the first organic coating layer 10 comprises:

[0068] 021: An intermediate oxide layer 20 is formed on the first organic coating layer 10 by a physical vapor deposition process.

[0069] Specifically, since the intermediate oxide layer 20 contacts the upper surface of the first organic coating 10, the intermediate oxide layer 20 should have high density and uniform distribution. High density can ensure that the intermediate oxide layer 20 has good barrier properties, preventing foreign substances from penetrating into the substrate 200, and uniform distribution can ensure that the performance of the intermediate oxide layer 20 is consistent across the entire surface of the substrate 200. In the embodiment of the present application, the intermediate oxide layer 20 can be formed on the upper surface of the first organic coating 10 by a physical vapor deposition (PVD) process, so that the intermediate oxide layer 20 has high density and uniform distribution.

[0070] In some embodiments, the thickness of the intermediate oxide layer 20 is in the range of 0.5 μm to 1 μm.

[0071] In other words, the thickness of the intermediate oxide layer 20 can be any value between 0.5 and 1 μm. For example, the thickness of the intermediate oxide layer 20 can be 0.5 μm, 0.55 μm, 0.6 μm, 0.65 μm, 0.7 μm, 0.75 μm, 0.8 μm, 0.85 μm, 0.9 μm, 0.95 μm, 1 μm, etc. When the thickness of the intermediate oxide layer 20 falls within the above range, the intermediate oxide layer 20 can be prevented from being too thick or too thin, thereby ensuring the performance of the intermediate oxide layer 20.

[0072] In certain embodiments, the thickness ratio of the first organic coating layer 10 to the intermediate oxide layer 20 is in a range of 5:1 to 20:1.

[0073] That is, the thickness ratio of the first organic coating layer 10 to the intermediate oxide layer 20 can be any value between 5:1 and 20:1. For example, the thickness ratio of the first organic coating layer 10 to the intermediate oxide layer 20 can be 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, or 20:1.

[0074] When the thickness ratio of the first organic coating 10 to the intermediate oxide layer 20 is too small, the first organic coating 10 is thin while the intermediate oxide layer 20 is thick. The thicker intermediate oxide layer 20 produces a large amount of corrosive products, which can cause bulging between the first organic coating 10 and the intermediate oxide layer 20, causing the two to separate, thereby affecting the service life and reliability of the coating. A thickness ratio of the first organic coating 10 to the intermediate oxide layer 20 that falls within the above range can prevent the intermediate oxide layer 20 from being too thick, which could affect the service life and reliability of the coating.

[0075] In some embodiments, the second organic coating 30 is a polytetrafluoroethylene coating. The polytetrafluoroethylene coating is hydrophobic and chlorine-resistant, which can limit the adhesion and penetration of corrosive liquids and protect the intermediate oxide layer 20 or the substrate 200.

[0076] See also Figure 5 In certain embodiments, forming a second organic coating 30 (ie, O30) on the intermediate oxide layer 20 includes:

[0077] 031: A second organic coating 30 is applied to the surface of the intermediate oxide layer 20 by a thermal spraying process.

[0078] Specifically, the second organic coating layer 30 may be coated on the upper surface of the intermediate oxide layer 20 by a thermal spraying process to ensure the bonding force between the second organic coating layer 30 and the intermediate oxide layer 20 .

[0079] In related art, when using graphene sealants for pore sealing, thermal spraying is not possible due to the extremely high melting point of graphene. Consequently, the bonding strength of the graphene sealant in this solution is difficult to guarantee, and its sealing effect cannot be guaranteed over long-term use. In the embodiments of the present application, however, the second organic coating 30 can be a polytetrafluoroethylene coating, which can be applied to the upper surface of the intermediate oxide layer 20 via a thermal spraying process. This ensures the bonding strength between the second organic coating 30 and the intermediate oxide layer 20, thereby improving the coating's service life and reliability.

[0080] In certain embodiments, the second organic coating layer 30 has a thickness ranging from 5 μm to 10 μm.

[0081] In other words, the thickness of the second organic coating 30 can be any value between 5 and 10 μm. For example, the thickness of the second organic coating 30 can be 5 μm, 5.5 μm, 6 μm, 6.5 μm, 7 μm, 7.5 μm, 8 μm, 8.5 μm, 9 μm, 9.5 μm, 10 μm, etc. When the thickness of the second organic coating 30 falls within the above range, the second organic coating 30 can be prevented from being too thick or too thin, thereby ensuring the performance of the second organic coating 30.

[0082] In certain embodiments, the thickness ratio of the second organic coating layer 30 to the intermediate oxide layer 20 is in a range of 5:1 to 20:1.

[0083] That is, the thickness ratio of the second organic coating layer 30 to the intermediate oxide layer 20 can be any value between 5:1 and 20:1. For example, the thickness ratio of the second organic coating layer 30 to the intermediate oxide layer 20 can be 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, 11:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, or 20:1.

[0084] When the thickness ratio of the second organic coating 30 to the intermediate oxide layer 20 is too small, the second organic coating 30 is thinner while the intermediate oxide layer 20 is thicker. The thinner second organic coating 30 allows the corrosive solution to easily enter the intermediate oxide layer 20 and react. At the same time, the thicker intermediate oxide layer 20 produces a large amount of corrosive products, which can cause bulging between the second organic coating 30 and the intermediate oxide layer 20, and even cause the second organic coating 30 to fall off, thereby affecting the service life and reliability of the coating. When the thickness ratio of the second organic coating 30 to the intermediate oxide layer 20 meets the above range, it can effectively prevent the second organic coating 30 from falling off and failing, thereby improving the service life and reliability of the coating.

[0085] See also Figure 2 and Figure 3 The composite coating 100 of the embodiment of the present application is prepared by using the composite coating forming method of any of the above embodiments.

[0086] The composite coating 100 prepared by the composite coating forming method according to the embodiment of the present application includes the above-mentioned first organic coating 10, the intermediate oxide layer 20 and the second organic coating 30, which will not be described in detail here.

[0087] See also Figure 6 The control valve 300 of the embodiment of the present application includes a valve body 301 and the composite coating 100. The valve body 301 is formed with a flow channel 3011, and the composite coating 100 is formed on the inner wall of the flow channel 3011.

[0088] Specifically, the control valve 300 may be an EGR valve (Exhaust Gas Recirculation Valve), which is used to precisely control the amount of exhaust gas recirculation to reduce nitrogen oxides (NO x ).exist Figure 6 In the example shown in FIG. 3 , the control valve 300 may include a valve body 301 , a valve 302 , a motor 303 , a valve stem 304 , a valve seat 305 , and a guide mechanism 306 .

[0089] The valve body 301 is the main body of the control valve 300. A flow channel 3011 is formed within the valve body 301, connecting the air inlet 307 and the air outlet 308 to facilitate gas circulation. When the valve 302 is opened, gas enters the flow channel 3011 through the air inlet 307 and is discharged through the air outlet 308, completing the gas circulation process. The motor 303, which can be a servo motor, serves as the power source for the control valve 300 and controls the opening and closing of the valve 302 according to commands from the engine control unit. The valve stem 304 connects the motor 303 to the valve 302, converting the rotational motion of the motor 303 into linear motion of the valve 302. The up and down movement of the valve stem 304 controls the opening and closing of the valve 302. The valve seat 305, which supports the valve 302, fits tightly with the valve body 301 to ensure the sealing and stability of the valve 302. The guide mechanism 306 is used to guide the movement of the valve stem 304 and the valve 302 to ensure that the valve 302 remains stable and does not get stuck during the opening and closing process.

[0090] In the embodiment of the present application, the composite coating 100 can be applied to the inner wall of the flow channel 3011 ( Figure 6 The dashed line indicates the inner wall of flow channel 3011 coated with composite coating 100. This prevents chlorine-containing liquids from corroding the inner wall of flow channel 3011. Corroded materials could then enter the gap between valve stem 304 and guide mechanism 306, potentially causing valve body 301 to become stuck and fail. In other words, the inner wall of flow channel 3011 serves as substrate 200.

[0091] See also Figure 7 The engine 400 according to the embodiment of the present application includes the control valve 300 .

[0092] See also Figure 8 The vehicle 1000 according to the embodiment of the present application includes the above-mentioned engine 400.

[0093] In summary, the composite coating forming method, composite coating 100, control valve 300, engine 400 and vehicle 1000 of the embodiment of the present application have at least the following advantages: First, no sealant is required, which can save material costs; second, no post-sealing treatment is required, and the operation is simple; third, the sealing rate is high and the reliability is good; fourth, the coating can effectively avoid shedding and failure, thereby improving the service life of the coating; fifth, the first organic coating 10 using a modified PTFE coating can ensure strong bonding with the substrate 200; sixth, the intermediate oxide layer 20 using an Al2O3 film can achieve self-sealing of the pores; seventh, the second organic coating 30 using a PTFE coating has a hydrophobic property that can limit liquid adhesion and penetration; eighth, the sandwich structure formed by the first organic coating 10, the intermediate oxide layer 20 and the second organic coating 30 can alleviate the thermal expansion coefficient mismatch problem between the substrate 200 and the composite coating 100. When the composite coating 100 prepared by the composite coating forming method of the embodiment of the present application is applied to the control valve 300, it can avoid problems such as valve body jamming and failure.

[0094] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means 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 application. 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.

[0095] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0096] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable storage medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a computer-readable storage medium can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable storage media include the following: an electrical connection having one or more wires (electronic devices), a portable computer disk cartridge (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disc read-only memory (CDROM). In addition, the computer-readable storage medium may even be paper or other suitable medium on which the program is printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner as necessary, and then stored in a computer memory.

[0097] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0098] Those skilled in the art will appreciate that all or part of the steps carried out in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment. In addition, the various functional units in the various embodiments of the present application can be integrated into a processing module, or each unit can exist physically alone, or two or more units can be integrated into one module. The above-mentioned integrated module can be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. The storage medium mentioned above can be a read-only memory, a disk or an optical disk, etc.

[0099] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A method for forming a composite coating, characterized in that: include: forming a first organic coating layer (10) on a substrate (200); forming an intermediate oxide layer (20) on the first organic coating layer (10); A second organic coating layer (30) is formed on the intermediate oxide layer (20).

2. The method for forming a composite coating according to claim 1, wherein: Before forming the first organic coating layer (10) on the substrate (200), the composite coating forming method further comprises: The surface of the substrate (200) is subjected to phosphating treatment.

3. The method for forming a composite coating according to claim 1, wherein: The first organic coating (10) is a modified polytetrafluoroethylene coating.

4. The method for forming a composite coating according to claim 3, wherein: The first organic coating (10) uses a silane coupling agent as a modifier.

5. The method for forming a composite coating according to claim 1, wherein: The step of forming a first organic coating layer (10) on a substrate (200) comprises: The first organic coating (10) is coated on the surface of the substrate (200) by a thermal spraying process.

6. The method for forming a composite coating according to claim 1, wherein: The thickness of the first organic coating (10) is in the range of 5 to 10 μm.

7. The method for forming a composite coating according to claim 1, wherein: The intermediate oxide layer (20) is an aluminum oxide film.

8. The method for forming a composite coating according to claim 1, wherein: The step of forming an intermediate oxide layer (20) on the first organic coating layer (10) comprises: The intermediate oxide layer (20) is formed on the first organic coating layer (10) by a physical vapor deposition process.

9. The method for forming a composite coating according to claim 1, wherein: The thickness of the intermediate oxide layer (20) ranges from 0.5 to 1 μm.

10. The method for forming a composite coating according to claim 1, wherein: The thickness ratio of the first organic coating (10) to the intermediate oxide layer (20) ranges from 5:1 to 20:

1.

11. The method for forming a composite coating according to claim 1, wherein: The second organic coating (30) is a polytetrafluoroethylene coating.

12. The method for forming a composite coating according to claim 1, wherein: The forming of a second organic coating layer (30) on the intermediate oxide layer (20) comprises: The second organic coating (30) is coated on the surface of the intermediate oxide layer (20) by a thermal spraying process.

13. The method for forming a composite coating according to claim 1, wherein: The thickness of the second organic coating (30) is in the range of 5 to 10 μm.

14. The method for forming a composite coating according to claim 1, wherein: The thickness ratio of the second organic coating (30) to the intermediate oxide layer (20) ranges from 5:1 to 20:

1.

15. A composite coating (100), characterized in that The composite coating is prepared by the composite coating forming method according to any one of claims 1 to 14.

16. A control valve (300), characterized in that: include: A valve body (301), wherein the valve body (301) is formed with a flow channel (3011); The composite coating (100) according to claim 15, wherein the composite coating (100) is formed on the inner wall of the flow channel (3011).

17. An engine (400), characterized in that Comprising the control valve (300) according to claim 16.

18. A vehicle (1000), characterized in that Comprising the engine (400) of claim 17.

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