An in-situ preparation device and method for a superhydrophobic surface of an underwater laser deposition repair layer

Abstract

The present invention relates to the field of laser processing technology, and particularly to a device and method for in-situ preparation of a superhydrophobic surface on a laser deposition repair layer underwater. It includes a dry area unit, a laser processing unit, a surface modification and detection unit, a first robotic arm unit, and a second robotic arm unit. The laser processing unit includes a laser deposition device and a femtosecond laser surface modification device. During the underwater processing of the entire device, air needs to be continuously filled to create a dry area. The damaged workpiece surface of the underwater equipment is repaired through the laser deposition device, and then micro-nano structures are prepared on the surface of the laser deposition repair layer through the femtosecond laser modification device, and the surface energy is reduced through the surface modification solution. The present invention can achieve the repair of the surface of damaged workpieces in ocean engineering and the in-situ preparation of a superhydrophobic surface, improving the service life of the laser deposition repair surface of damaged workpieces in ocean engineering equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of laser processing, and particularly relates to an in-situ preparation device and method for a superhydrophobic surface of an underwater laser deposition repair layer. Background Art

[0002] The corrosion problems of infrastructure and important industrial facilities serving in the marine environment are serious, especially the corrosion problems of ships and offshore platforms are more prominent. Corrosion has become the most important factor affecting the service safety, life, and reliability of ships, offshore engineering, and ocean facilities. The marine environment is a complex corrosion environment. In this environment, seawater itself is a strong corrosive medium. At the same time, waves, tides, and currents generate low-frequency reciprocating stresses and impacts on metal components. In addition, marine microorganisms, attached organisms, and their metabolites all have direct or indirect accelerating effects on the corrosion process. Therefore, improving the corrosion resistance of marine metal materials is of great significance for ensuring the service safety and reliability of marine engineering and ships, reducing the occurrence of major catastrophic accidents, and extending the service life of marine structures.

[0003] From inshore to offshore, the service environment faced by marine engineering equipment is becoming more and more harsh. Marine engineering equipment urgently needs to be repaired and surface modified to ensure the use safety and service life of the equipment. Wettability is one of the important properties of the metal material surface. The wettability of the material surface reflects the hydrophilicity and hydrophobicity of the material. As a special state of wettability, superhydrophobicity widely exists in nature. It has the advantages of self-cleaning, corrosion resistance, oil-water separation, and anti-icing. Preparing a superhydrophobic modified surface on the surface of a damaged underwater metal workpiece by femtosecond laser can significantly improve the corrosion resistance of the metal and extend the service life of marine service equipment.

[0004] At present, the research on preparing superhydrophobic modified metal surfaces by femtosecond laser mainly focuses on the air. By processing the metal surface with femtosecond laser under different process parameters to prepare micro-nano structures, and then reducing the surface energy of the material by heat treatment or coating solutions such as fluorosilane, the preparation of superhydrophobic modified metal surfaces is realized. Patent CN 114799217 B proposes a method for realizing superhydrophobicity on the surface of an additive manufacturing NiTi alloy based on femtosecond laser processing. This method realizes the preparation of a superhydrophobic surface, but this method cannot realize the in-situ preparation of a superhydrophobic surface underwater. Patent CN 113584297 A proposes a method for improving the intensity of underwater femtosecond laser shock processing. This method enables the laser to realize underwater femtosecond laser processing through a vacuum container. However, this method excites the laser beam from the air, and the vacuum environment is not easy to prepare, which is not suitable for in-situ femtosecond laser surface treatment underwater and the preparation of superhydrophobic structures.

[0005] Underwater local dry laser deposition provides conditions for repairing damaged workpieces and femtosecond laser superhydrophobic modification of the surface of damaged workpieces. Drain the water in the underwater seal through air extraction to achieve a dry area. Prepare micro-nano structures on the surface of the damaged metal workpiece by femtosecond laser in the dry area unit, and then reduce the surface energy of the material by coating solutions such as fluorosilane to achieve a superhydrophobic structure on the surface of the damaged workpiece, which is expected to extend the service life of damaged workpieces in marine operations. Summary of the Invention

[0006] In view of the current requirements of ocean engineering for the repair and surface modification of metal damaged workpieces in the marine service environment, the present invention proposes an in-situ preparation device and method for a superhydrophobic surface of an underwater laser deposition repair layer to achieve in-situ repair and surface modification of underwater damaged workpieces and improve the service life of repaired metal damaged workpieces.

[0007] The technical solution of the present invention, an in-situ preparation device for a superhydrophobic surface of an underwater laser deposition repair layer, includes a dry area unit, a laser processing unit, and a surface modification and detection unit. A first liquid inlet and an air supply port are respectively arranged at the top of the dry area unit; an air supply device supplies air into the dry area unit through the air supply port to form a dry area inside the dry area unit.

[0008] A first robotic arm unit and a second robotic arm unit are arranged inside the dry area unit;

[0009] The laser processing unit is installed on the first robotic arm unit and moves inside the dry area unit driven by the first robotic arm unit; the laser processing unit repairs the surface of the damaged workpiece.

[0010] The surface modification and detection unit is installed on the second robotic arm unit and moves inside the dry area unit driven by the second robotic arm unit; the surface modification and detection unit modifies and detects the surface of the repaired workpiece.

[0011] Preferably, the laser processing unit includes a laser deposition device, a femtosecond laser surface modification device, a connecting block, and a rotating module;

[0012] The rotating module is installed at the end of the first robotic arm; the laser deposition device and the femtosecond laser surface modification device are installed on the rotating module through the connecting block;

[0013] The laser deposition device repairs and surface-treats the surface of the damaged workpiece;

[0014] The femtosecond laser surface modification device processes micro-nano structures on the surface of the damaged workpiece repaired by laser deposition.

[0015] Preferably, the surface modification and detection unit includes a surface modification device and an internal detection device in a semi-sealed cavity; the first motor is fixedly connected to the second robotic arm unit by screws;

[0016] The first motor drives the first ball screw to rotate. Under the action of power, the semi-sealed cavity is pressed down, and the contact part at the bottom of the semi-sealed cavity is compacted with the surface of the damaged workpiece to be repaired and kept sealed.

[0017] Preferably, a second liquid inlet is provided at the top of the semi-sealed cavity; the first hose for transporting the surface modification liquid enters the semi-sealed cavity through the first liquid inlet and the second liquid inlet in sequence;

[0018] An outlet is provided at the bottom of the semi-sealed cavity, and the used surface modification liquid is discharged outwards through the second hose connected to the outlet for recycling; a water pump for recycling is provided on the second hose.

[0019] Preferably, the internal detection device of the semi-sealed cavity includes an LED cold light source, a drying device and a droplet injector;

[0020] A third robotic arm unit is installed inside the semi-sealed cavity, and a second high-speed camera is installed at the end of the third robotic arm unit;

[0021] The drying device dries the surface of the damaged workpiece, the liquid enters the droplet injector through the third hose and drips on the surface of the damaged workpiece, the LED cold light source irradiates the droplet and the surface of the damaged workpiece, and the second high-speed camera adjusts the shooting position through the third robotic arm unit to obtain the hydrophobic conditions of the droplet and the surface of the damaged workpiece in real time and feedback to the upper computer.

[0022] Preferably, a third motor is provided inside the semi-sealed cavity; the third motor is in transmission connection with the third ball screw in a matching manner; the third motor drives the third ball screw to move, driving the droplet injector, the LED cold light source and the drying device to move together and cooperate with the second high-speed camera.

[0023] Preferably, a high-speed camera detection module is provided on the inner wall of the dry area unit, including a first high-speed camera, a second ball screw and a second motor; the second motor drives the second ball screw to drive the first high-speed camera to move up and down; the first high-speed camera takes pictures of the connection between the surface of the damaged workpiece and the dry area unit to obtain information on the distance between the copper head of the laser and the surface of the damaged workpiece.

[0024] An in-situ preparation method for a superhydrophobic surface of an underwater laser deposition repair layer includes the following specific steps:

[0025] S1. Transport the device for in-situ preparation of a superhydrophobic surface of an underwater laser deposition repair layer to the target sea area through a transportation tool, move the laser deposition device to the area of the damaged workpiece to be repaired. During the entire underwater operation process, gas is continuously introduced into the dry area unit to displace the seawater on the surface of the damaged workpiece to achieve a dry area; the internal situation of the dry area unit is observed in real time through the first high-speed camera to ensure that the inside of the dry area unit remains dry during the underwater process;

[0026] S2. Move the laser deposition device to a position 13 - 15 mm above the surface of the damaged workpiece through the first robotic arm unit. Introduce inert gas into the laser deposition device and eject it from the bottom to create a stable local dry processing environment in the processing area. Select the laser deposition process parameters and perform deposition repair on the surface of the damaged workpiece according to the planned path.

[0027] S3. After completing the laser deposition repair, move the femtosecond laser surface modification device to a position 13 - 15 mm above the surface of the repaired damaged workpiece through the first robotic arm unit. At the same time, introduce inert gas into the femtosecond laser surface modification device and vent it from the bottom outlet to create a stable local dry processing environment in the processing area. Select the femtosecond laser processing parameters and machine micro - nano structures on the surface of the damaged workpiece repaired by laser deposition according to the planned path. After processing, use the first robotic arm unit to move the laser processing unit to the highest position within the dry area unit.

[0028] S4. Open the surface modification unit. Move the surface modification and detection unit to the damaged workpiece to be repaired through the second robotic arm unit. Observe through the second high - speed camera inside the semi - sealed chamber. Move the semi - sealed chamber so that the bottom of the semi - sealed chamber contacts the surface of the damaged workpiece. The first motor operates to drive the first ball screw to rotate, and the first ball screw realizes downward pressure, driving the semi - sealed chamber to move downward to achieve compaction of the contact part. Input the surface modification liquid through the first hose at the second liquid inlet at the top of the semi - sealed chamber, let it stand for 1 - 5 hours, and pump the waste liquid out through the second hose from the liquid outlet for recycling through a water pump.

[0029] S5. After surface modification is completed, dry the surface of the damaged workpiece through the drying device. Turn on the LED cold light source. The liquid droplets flow through the second hose to the droplet injector and inject the liquid onto the surface of the damaged workpiece. Detect the contact angle size through the second high - speed camera combined with software (ImageJ). When the contact angle is greater than 150°, the preparation of the super - hydrophobic surface is achieved. When the measured contact angle is less than 150°, repeat steps S3 and S4.

[0030] S6. After the super - hydrophobic modification of the surface of the damaged workpiece is completed, move the surface modification unit to the highest point of the dry area unit. Pull the dry area unit out of the water surface through the equipment, and then stop supplying gas into the dry area unit.

[0031] Compared with the prior art, the present invention has the following beneficial technical effects:

[0032] 1. After the underwater laser deposition repair of the part to be repaired, the present invention uses femtosecond laser to prepare micro-nano structures on the surface of the damaged workpiece, increases the contact angle of the surface of the damaged workpiece through surface modification, reduces the surface energy, and immediately realizes the in-situ superhydrophobic modification of the repaired surface of the underwater damaged workpiece. It can improve the corrosion resistance of the damaged workpiece, extend the service life of the damaged workpiece, and greatly reduce the economic cost.

[0033] 2. In the present invention, the bottom material of the semi-sealed cavity of the surface modification unit is a soft corrosion-resistant material. The bottom material of the semi-sealed cavity can be replaced and installed according to the actual working conditions. The shape of the material is selected to fit more closely with the damaged workpiece. Under the action of the third motor and the third ball screw, the bottom is sealed to prevent the leakage of the surface modification solution during surface modification, and it can be designed according to the shape of the damaged workpiece under different working conditions to complete the preparation of micro-nano structures with high quality.

[0034] 3. In the present invention, the third motor drives the push rod on the third ball screw to move downward, realizes the movement of the drying device, the droplet injector and the LED cold light source on the push rod, and cooperates with the movable second high-speed camera to measure the underwater contact angle. Description of the Drawings

[0035] Figure 1 is a schematic structural diagram of the underwater laser deposition and femtosecond laser in-situ preparation of superhydrophobic surface device of the present invention;

[0036] Figure 2 is a schematic diagram of the laser head of the laser processing unit of the present invention;

[0037] Figure 3 is a schematic diagram of the inside of the semi-sealed cavity of the surface modification and detection unit of the present invention.

[0038] Reference Numerals: 1, first liquid inlet; 2, second robotic arm unit; 3, first motor; 4, first ball screw; 5, surface modification and detection unit; 6, femtosecond laser surface modification device; 7, laser processing unit; 8, laser deposition device; 9, first high-speed camera; 10, second ball screw; 11, second motor; 12, connecting block; 13, rotation module; 14, first robotic arm unit; 15, air supply port; 16, dry area unit; 17, air supply port; 18, laser head; 19, third motor; 20, third robotic arm unit; 21, second high-speed camera; 22, droplet injector; 23, drying device; 24, LED cold light source; 25, push rod; 26, contact member; 27, liquid outlet; 28, water pump; 29, second hose; 30, semi-sealed cavity; 31, third ball screw; 32, second liquid inlet; 33, first hose; 34, third hose. Detailed Embodiments

[0039] Example 1

[0040] As Figure 1-2 shown, an in-situ preparation device and method for a superhydrophobic surface of an underwater laser deposition repair layer proposed by the present invention include a dry area unit 16, a laser processing unit 7, and a surface modification and detection unit 5. A first liquid inlet 1 and an air supply port 15 are respectively arranged at the top of the dry area unit 16; an air supply device supplies air into the dry area unit 16 through the air supply port 15 to form a dry area inside the dry area unit 16;

[0041] A first robotic arm unit 14 and a second robotic arm unit 2 are arranged inside the dry area unit 16;

[0042] The laser processing unit 7 is installed on the first robotic arm unit 14 and moves inside the dry area unit 16 driven by the first robotic arm unit 14; the laser processing unit 7 repairs the surface of the damaged workpiece;

[0043] The surface modification and detection unit 5 is installed on the second robotic arm unit 2 and moves inside the dry area unit 16 driven by the second robotic arm unit 2; the surface modification and detection unit 5 modifies and detects the surface of the repaired workpiece.

[0044] As Figure 1 shown, the laser processing unit 7 is installed on the rotation module 13 through a connection block 12, and both the laser deposition device 8 and the femtosecond laser surface modification device 6 can process the surface of the damaged workpiece according to the planned path.

[0045] As Figure 2 shown, an air supply port 17 is arranged beside the copper head 18 of the laser at the bottom of the laser processing unit 7. The air supply port 17 is opened first during laser processing to improve the safety of the laser.

[0046] As Figure 3 shown, the surface modification and detection unit 5 is used for underwater femtosecond laser superhydrophobic modification to reduce the surface energy of the damaged workpiece and detect the superhydrophobic performance of the damaged workpiece. The first motor 3 rotates to drive the semi-sealed cavity 30 to press down through the first ball screw 4, and the contact member 26 is compacted to achieve sealing. The contact member 26 is a soft sealing material.

[0047] Inject the surface modification solution through the first hose 33 of the second infusion port 32, let it stand for 1 - 5 hours. After the modification is completed, the water pump 28 works, and the surface modification solution is recycled and cleaned through the second hose 29 from the liquid outlet 27. The drying device 23 inside the semi - sealed cavity 30 dries the surface of the damaged workpiece. Turn on the LED cold light source 24, inject the liquid into the droplet injector 22 through the third hose 34 and let it drip from the bottom of the droplet injector 22. The contact angle between the droplet and the surface of the damaged workpiece is transmitted to the ship in real - time through the second high - speed camera 21. The software (ImageJ) analyzes the contact angle size to detect whether the surface of the damaged workpiece has achieved super - hydrophobic modification. The second high - speed camera 21 has the function of real - time video transmission, mainly used to complete real - time shooting of the surface modification of the damaged workpiece, transmit the video data to the ship in real - time, and control the underwater surface modification and detection process. When the measured contact angle is less than 150°, the surface modification work is carried out again.

[0048] As Figure 1 shown, the first robotic arm unit 14 has six degrees of freedom, and its moving end is the end rotation module 13. The end rotation module 13 can adjust the relative positions of the femtosecond laser surface modification device 6 and the laser deposition device 8 within the dry area unit 16. By rotating a certain angle, after laser deposition, femtosecond laser is used to prepare surface micro - nano structures.

[0049] Example 2

[0050] Based on the above - mentioned underwater laser deposition and femtosecond laser in - situ preparation of super - hydrophobic surface device, this example provides a method for underwater laser deposition and femtosecond laser in - situ preparation of super - hydrophobic surface. The implementation process mainly includes the following steps:

[0051] S1. Transport the device for in - situ preparation of super - hydrophobic surface on the underwater laser deposition repair layer to the target sea area through a transportation tool. Move the laser deposition device 8 to the area of the damaged workpiece to be repaired. During the entire underwater operation process, gas is continuously introduced into the dry area unit 16 to displace the seawater on the surface of the damaged workpiece and achieve a dry area. Observe the inside of the dry area unit 16 in real - time through the first high - speed camera 9 to ensure that the inside of the dry area unit 16 remains dry during the underwater process.

[0052] S2. Move the laser deposition device 8 to 13 - 15 mm above the surface of the damaged workpiece through the first robotic arm unit 14. Inject inert gas into the laser deposition device 8 and eject it from the bottom to achieve a stable local processing environment dry area in the processing area. Select the laser deposition process parameters and deposit and repair the surface of the damaged workpiece according to the planned path.

[0053] S3. After the laser deposition repair is completed, the femtosecond laser surface modification device 6 is moved by the first robotic arm unit 14 to a position 13 - 15 mm above the surface of the repaired damaged workpiece. Meanwhile, an inert gas is introduced into the femtosecond laser surface modification device 6, and gas is discharged from the bottom air outlet to create a stable local processing environment dry zone in the processing area. Select the femtosecond laser processing process parameters, and process micro - nano structures on the surface of the laser deposition - repaired damaged workpiece according to the planned path. After the processing is completed, the laser processing unit 7 is moved by the first robotic arm unit 14 to the highest position inside the dry zone unit 16;

[0054] S4. Open the surface modification unit. The surface modification and detection unit 5 is moved by the second robotic arm unit 2 above the damaged workpiece to be repaired. Through the second high - speed camera 21 inside the semi - sealed cavity 30, observe and move the semi - sealed cavity 30. When the bottom of the semi - sealed cavity 30 contacts the surface of the damaged workpiece, the first motor 3 works to drive the first ball screw 4 to rotate. The first ball screw 4 realizes downward pressure, driving the semi - sealed cavity 30 to move downward to achieve the compaction of the contact member 26. The surface modification liquid is input through the first hose 33 at the second liquid inlet 32 at the top of the semi - sealed cavity 30. Let it stand for 1 - 5 hours, and the waste liquid is pumped out through the second hose 29 from the liquid outlet 27 by the water pump 28 for recycling;

[0055] S5. After the surface modification is completed, the surface of the damaged workpiece is dried by the drying device 23. Open the LED cold light source 24. The liquid droplets flow through the second hose 29 to the droplet injector 22 and inject the liquid onto the surface of the damaged workpiece. Take pictures through the second high - speed camera 21 and detect the contact angle size through software (ImageJ). When the contact angle is greater than 150°, the preparation of the super - hydrophobic surface is achieved; when the measured contact angle is less than 150°, repeat steps S3 and S4.

[0056] S6. After the super - hydrophobic modification of the surface of the damaged workpiece is completed, move the surface modification unit to the highest point of the dry zone unit. The dry zone unit 16 is pulled out of the water surface by the equipment, and then the gas supply to the dry zone unit 16 is stopped.

[0057] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to this. Various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. An in-situ preparation device for a superhydrophobic surface of an underwater laser deposition repair layer, comprising a dry area unit (16), a laser processing unit (7) and a surface modification and detection unit (5), characterized in that: A first liquid inlet (1) and an air supply port (15) are respectively arranged at the top of the dry area unit (16); the air supply device supplies air into the dry area unit (16) through the air supply port (15), and a dry area is formed inside the dry area unit (16). A first robotic arm unit (14) and a second robotic arm unit (2) are arranged inside the dry area unit (16); the laser processing unit (7) is installed on the first robotic arm unit (14) and moves inside the dry area unit (16) driven by the first robotic arm unit (14); the laser processing unit (7) repairs the surface of the damaged workpiece; the surface modification and detection unit (5) is installed on the second robotic arm unit (2) and moves inside the dry area unit (16) driven by the second robotic arm unit (2); the surface modification and detection unit (5) modifies and detects the surface of the repaired workpiece; the surface modification and detection unit (5) includes a surface modification device and an internal detection device for the semi-sealed cavity; the first motor (3) and the second robotic arm unit (2) are fixedly connected by screws. The first motor (3) drives the first ball screw (4) to rotate. Under the action of power, the semi-sealed cavity (30) presses down, and the contact member (26) at the bottom of the semi-sealed cavity (30) compacts and seals the surface of the damaged workpiece to be repaired; a second liquid inlet (32) is arranged at the top of the semi-sealed cavity (30); the first hose (33) for transporting the surface modification liquid enters the semi-sealed cavity (30) through the first liquid inlet (1) and the second liquid inlet (32) in sequence. A liquid outlet (27) is arranged at the bottom of the semi-sealed cavity (30), and the used surface modification liquid is discharged outwards through the second hose (29) connected to the liquid outlet (27) for recycling; a water pump (28) for recycling is arranged on the second hose (29).

2. The in-situ preparation device for superhydrophobic surface of underwater laser deposition repair layer according to claim 1, characterized in that, The laser processing unit (7) includes a laser deposition device (8), a femtosecond laser surface modification device (6), a connecting block (12) and a rotating module (13). The rotating module (13) is installed at the end of the first robotic arm unit (14); the laser deposition device (8) and the femtosecond laser surface modification device (6) are installed on the rotating module (13) through the connecting block (12). The laser deposition device (8) repairs and processes the surface of the damaged workpiece; the femtosecond laser surface modification device (6) processes micro-nano structures on the surface of the damaged workpiece repaired by laser deposition.

3. An in-situ preparation device for a superhydrophobic surface of an underwater laser deposition repair layer according to claim 1, characterized in that, The internal detection device of the semi-sealed cavity (30) includes an LED cold light source (24), a drying device (23) and a droplet injector (22). A third robotic arm unit (20) is installed inside the semi-sealed cavity, and a second high-speed camera (21) is installed at the end of the third robotic arm unit (20). The drying device (23) dries the surface of the damaged workpiece, the liquid enters the droplet injector (22) through the third hose (34), drips on the surface of the damaged workpiece, the LED cold light source (24) irradiates the droplet and the surface of the damaged workpiece, and the second high-speed camera (21) adjusts the shooting position through the third robotic arm unit (20) to obtain the hydrophobic condition of the droplet and the surface of the damaged workpiece in real time and feedback it to the upper computer.

4. An in-situ preparation device for a superhydrophobic surface of an underwater laser deposition repair layer according to claim 3, characterized in that, A third motor (19) is arranged inside the semi-sealed cavity (30); the third motor (19) is in transmission connection with a third ball screw (31) in a cooperative manner; the third motor (19) drives the third ball screw (31) to move, driving the droplet injector (22), the LED cold light source (24) and the drying device (23) to move together and cooperate with the second high-speed camera (21).

5. An in-situ preparation device for a superhydrophobic surface of an underwater laser deposition repair layer according to claim 1, characterized in that, A high-speed camera detection module is arranged on the inner wall of the dry area unit (16), including a first high-speed camera (9), a second ball screw (10) and a second motor (11); the second motor (11) drives the second ball screw (10) to drive the first high-speed camera (9) to move up and down; the first high-speed camera (9) takes pictures of the connection condition between the surface of the damaged workpiece and the dry area unit (16), and obtains the information of the distance between the copper head of the laser and the surface of the damaged workpiece.

6. A method for in-situ preparation of a superhydrophobic surface of an underwater laser deposition repair layer is proposed based on the device for in-situ preparation of a superhydrophobic surface of an underwater laser deposition repair layer according to any one of claims 1-5, characterized in that, It includes the following specific steps: S1. Transport the device for in-situ preparation of a superhydrophobic surface on an underwater laser deposition repair layer to the target sea area by a transport vehicle, move the laser deposition device (8) to the area of the damaged workpiece to be repaired. During the entire underwater operation process, gas is continuously introduced into the dry area unit (16) to displace the seawater on the surface of the damaged workpiece, realizing a dry area; the internal situation of the dry area unit (16) is observed in real time through the first high-speed camera (9) to ensure that the inside of the dry area unit (16) is always dry during the underwater process. S2. Move the laser deposition device (8) above the surface of the damaged workpiece through the first robotic arm unit (14), introduce an inert gas into the laser deposition device (8), and eject it from the bottom to realize a stable local processing environment dry area in the processing area. Select the laser deposition process parameters and deposit and repair the surface of the damaged workpiece according to the planned path. S3. After completing the laser deposition repair, move the femtosecond laser surface modification device (6) above the surface of the repaired damaged workpiece through the first robotic arm unit (14), and at the same time introduce an inert gas into the femtosecond laser surface modification device (6), and gas is discharged from the bottom air outlet to realize a stable local processing environment dry area in the processing area. Select the femtosecond laser process parameters and process micro-nano structures on the surface of the damaged workpiece repaired by laser deposition according to the planned path; after the processing is completed, use the first robotic arm unit (14) to move the laser processing unit (7) to the highest position inside the dry area unit (16). S4. Open the surface modification unit, move the surface modification and detection unit (5) above the damaged workpiece to be repaired through the second robotic arm unit (2), observe through the second high-speed camera (21) inside the semi-sealed cavity (30), move the semi-sealed cavity (30), the bottom of the semi-sealed cavity (30) contacts the surface of the damaged workpiece, the first motor (3) works to drive the first ball screw (4) to rotate, the first ball screw (4) realizes downward pressure, drives the semi-sealed cavity (30) to move downward, realizes the compaction of the contact member (26), inputs the surface modification liquid through the first hose (33) at the second liquid inlet (32) at the top of the semi-sealed cavity (30), stand for 1 - 5 hours, and pump the waste liquid from the liquid outlet (27) through the second hose (29) by a water pump (28) for recovery. S5. After the surface modification is completed, the surface of the damaged workpiece is dried by the drying device (23). The LED cold light source (24) is turned on. The liquid droplets flow through the second hose (29) to the droplet injector (22), and the liquid is injected onto the surface of the damaged workpiece. The contact angle is detected by the second high-speed camera (21). When the contact angle is greater than 150°, the preparation of the superhydrophobic surface is achieved; when the measured contact angle is less than 150°, steps S3 and S4 are repeated. S6. After the superhydrophobic modification of the surface of the damaged workpiece is completed, the surface modification unit is moved to the highest point of the dry area unit, and the dry area unit (16) is pulled out of the water surface by the equipment, and then the air supply to the dry area unit (16) is stopped.

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