Optimization Design and Manufacturing Method and System of Corrosion-Resistant Alloy Structure for Dock Folding Device

Abstract

The present invention discloses a method and device for optimizing the design and manufacturing of an alloy structure. The method includes: by means of numerical simulation methods, regulating the alloy microstructure, surface free energy parameters, as well as the corrosion environment and stress boundary conditions, calculating the corrosion potential, corrosion current density and charge transfer resistance of the alloy under different conditions; establishing a quantitative relationship between the alloy microstructure, surface free energy and corrosion resistance; according to the target microstructure parameters, constructing an alloy with the target microstructure by 3D printing; using pretreatment conditions and fluoroalkylsilane modification conditions to prepare a superhydrophobic alloy; analyzing the influence rules of 3D printing conditions, pretreatment conditions and fluoroalkylsilane modification conditions on the alloy microstructure, surface free energy and hydrophobicity; optimizing the alloy preparation conditions according to the influence rules. Combining theoretical simulation and experiments, clarify the internal relationship between the construction method of the corrosion-resistant alloy - microstructure, surface free energy - hydrophobicity - corrosion resistance, and improve the corrosion resistance of the alloy structure.

Description

Technical Field

[0001] The present invention relates to the field of corrosion-resistant alloy materials, and particularly to an optimized design and manufacturing method and system for the corrosion-resistant alloy structure of a dock folding device. Background Art

[0002] With the development of ship and ocean engineering technologies, the dock folding device in the dock, as an important facility for the manufacturing, maintenance and repair of marine engineering equipment such as ships, is prone to surface corrosion in the seawater environment for a long time, affecting its service life. In particular, the hydraulic devices of the dock folding device also need to withstand the internal and external high-pressure environment, further affecting its structural strength and corrosion resistance. Therefore, it is necessary to study the surface damage and corrosion process of alloy structural parts, especially hydraulic devices, under the condition of uniform external high pressure of seawater, explore the microscopic mechanism analysis technology of material failure, reveal the inhibition mechanism of alloy processing process parameters on the (electro)chemical corrosion and leakage of the material surface, and develop an effective method for in-situ regulation of surface anti-corrosion and anti-leakage performance during forming, so as to lay a foundation for the corrosion-resistant optimized design and manufacturing of alloy structures. Summary of the Invention

[0003] Aiming at the above defects or improvement requirements of the prior art, the present invention provides an optimized design and manufacturing method and system for the corrosion-resistant alloy structure of a dock folding device, which can combine theoretical simulation and experiments to clarify the internal relationship between the construction method - microstructure, surface free energy - hydrophobicity - corrosion resistance of the corrosion-resistant alloy, provide a basis for the optimized design of the alloy, and improve the corrosion resistance of the alloy structure.

[0004] To achieve the above object, the present invention adopts the following technical solutions.

[0005] In some embodiments, an optimized design and manufacturing method for the corrosion-resistant alloy structure of a dock folding device is provided, and the method includes:

[0006] Capturing the evolution process of the alloy cross-section microstructure in seawater by numerical simulation method;

[0007] Calculating the corrosion potential, corrosion current density and charge transfer resistance of the alloy under different conditions by regulating the alloy microstructure, surface free energy parameters, and corrosion environment and stress boundary conditions, so as to measure the corrosion resistance of the alloy;

[0008] Establishing a quantitative relationship between the alloy microstructure, surface free energy and corrosion resistance;

[0009] Screening alloys with high corrosion potential and low corrosion current density and their corresponding microstructures and surface free energies to obtain the target microstructure parameters and target surface free energy parameters of the alloy;

[0010] According to the target microstructure parameters, using the preset 3D printing conditions, an alloy with the target microstructure is constructed by metal 3D printing;

[0011] Using the preset pretreatment conditions, a dense oxide film is modified on the surface of the alloy by a pretreatment method;

[0012] Using the preset fluoroalkylsilane modification conditions, the alloy with the oxide film is modified by fluoroalkylsilane to prepare a superhydrophobic alloy;

[0013] The microstructure parameters of the superhydrophobic alloy, the functional group content of the alloy, the composition of the oxide film, the seawater contact angle and the surface free energy are detected by a detection device; thereby analyzing the influence laws of the 3D printing conditions, the pretreatment conditions and the fluoroalkylsilane modification conditions on the alloy microstructure, surface free energy and hydrophobicity;

[0014] Optimize the alloy preparation conditions according to the influence laws.

[0015] In some embodiments, the alloy includes one or more of aluminum alloy, copper alloy, stainless steel, and titanium alloy.

[0016] In some embodiments, the numerical simulation method includes a molecular dynamics simulation method and a finite element simulation method.

[0017] In some embodiments, the corrosion environment and stress boundary conditions include a corrosion medium, a temperature, and stress boundary conditions.

[0018] In some embodiments, the pretreatment method includes at least one of a micro-arc oxidation method, an anodic oxidation method, and a hydrothermal oxidation method; the fluoroalkylsilane includes perfluorooctyltriethoxysilane or perfluorodecyltrichlorosilane.

[0019] In some embodiments, detecting the microstructure parameters of the superhydrophobic alloy, the functional group content of the alloy, the composition of the oxide film, the seawater contact angle and the surface free energy by a detection device includes:

[0020] Detecting the microstructure parameters of the superhydrophobic alloy by a scanning electron microscope or a metallographic microscope;

[0021] Detecting the functional group content and the oxide film composition parameters of the superhydrophobic alloy by an X-ray photoelectron spectrometer, an X-ray diffractometer, and an infrared spectrum;

[0022] Detecting the seawater contact angle and the surface free energy of the superhydrophobic alloy by a contact angle tester.

[0023] In some embodiments, the method further includes:

[0024] The corrosion resistance of the superhydrophobic alloy is tested through salt spray immersion tests and electrochemical tests, and the charge transfer resistance is characterized by testing and simulating the electrochemical impedance spectra of different superhydrophobic alloys.

[0025] The steady-state electrochemical behavior is analyzed through potentiodynamic polarization tests, and the corrosion potential, corrosion current density, cathodic Tafel slope, and anodic Tafel slope parameters of different superhydrophobic alloys are compared.

[0026] Analyze the influence law of hydrophobicity on corrosion behavior, so as to obtain the correlation between the construction method of the alloy - microstructure, surface free energy - hydrophobicity - corrosion resistance.

[0027] Optimize the target preparation conditions according to the said correlation.

[0028] In some embodiments, a 3.5% NaCl solution with a pH of 8 is used to simulate the seawater environment as the corrosion resistance test medium for electrochemical tests.

[0029] In some embodiments, the method further includes:

[0030] By adjusting the heat source and process parameters, change the solidification of the alloy microstructure, or induce the formation of different microstructure orientations by changing the scanning strategy and forming angle, and then analyze the relationship between process parameters - microstructure - wear resistance and strength. Combining the plastic damage mechanism of the microstructure, induce the microstructure with performance as the goal, so as to achieve in-situ enhancement of wear resistance and strength.

[0031] In some embodiments, an optimized design and manufacturing system for the corrosion-resistant alloy structure of a dock folding device is also provided. The system includes:

[0032] A numerical simulation module, which captures the evolution process of the alloy cross-section microstructure in seawater through numerical simulation methods.

[0033] A corrosion resistance quantitative relationship establishment module, which calculates the corrosion potential, corrosion current density, and charge transfer resistance of the alloy under different conditions by regulating the alloy microstructure, surface free energy parameters, and corrosion environment and stress boundary conditions, and is used to measure the corrosion resistance of the alloy; establish the quantitative relationship between the alloy microstructure, surface free energy, and corrosion resistance.

[0034] A target parameter acquisition module, which screens alloys with high corrosion potential and low corrosion current density and their corresponding microstructures and surface free energies to obtain the target microstructure parameters and target surface free energy parameters of the alloy.

[0035] A 3D printing module, which constructs an alloy with a target microstructure by metal 3D printing according to the target microstructure parameters using preset 3D printing conditions.

[0036] A pretreatment module, which uses preset pretreatment conditions and modifies a dense oxide film on the surface of the alloy through a pretreatment method;

[0037] A modification module, which uses preset fluoroalkylsilane modification conditions and modifies the alloy with the oxide film through fluoroalkylsilane, thereby preparing a superhydrophobic alloy;

[0038] A detection module, which detects the microstructure parameters of the superhydrophobic alloy, the functional group content of the alloy, the composition of the oxide film, the seawater contact angle and the surface free energy through detection equipment; thereby analyzing the influence laws of 3D printing conditions, pretreatment conditions and fluoroalkylsilane modification conditions on the alloy microstructure, surface free energy and hydrophobicity;

[0039] An optimization module, which optimizes the alloy preparation conditions according to the influence laws.

[0040] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0041] In some embodiments of the present application, methods such as molecular dynamics simulation and finite element simulation are used to capture the evolution process of the alloy cross-section microstructure in seawater. By regulating model and material parameters such as alloy microstructure, surface free energy, and phase composition, as well as boundary conditions such as corrosive medium, temperature, and stress, the corrosion potential, corrosion current density, and charge transfer resistance of the alloy under different conditions are calculated to measure the corrosion resistance of the alloy. A quantitative relationship between the alloy microstructure, surface free energy, and its corrosion resistance is established, and alloys with high corrosion potential and low corrosion current density and their corresponding microstructures and surface free energies are screened.

[0042] On this basis, a titanium alloy with a specific microstructure is constructed by metal 3D printing, a dense oxide film is modified on its surface through pretreatment means such as micro-arc oxidation, anodic oxidation, and hydrothermal oxidation, and the alloy with the oxide film is modified through fluoroalkylsilanes such as perfluorooctyltriethoxysilane and perfluorodecyltrichlorosilane, thereby realizing the preparation of a superhydrophobic alloy.

[0043] Combining theoretical simulation and experiments, the internal relationship between the construction method of corrosion-resistant alloys - microstructure, surface free energy - hydrophobicity - corrosion resistance is obtained, providing guidance for alloy modification design.

[0044] By directly regulating the performance during the part forming process, parts with high surface wear resistance and high strength can be directly obtained, and the dependence of metal additive manufacturing parts on post-treatment methods can be reduced or eliminated as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of the overall process of the alloy structure optimization design and manufacturing method according to an embodiment of the present invention.

[0046] Figure 2 Schematic diagram of the corrosion mechanism of the alloy structure according to an embodiment of the present invention under elastic stress.

[0047] Figure 3 Schematic diagram of the corrosion mechanism of the alloy structure according to an embodiment of the present invention under plastic stress.

[0048] Figure 4 Schematic diagram of the process for manufacturing the corrosion-resistant surface of the alloy structure according to an embodiment of the present invention.

[0049] Figure 5 Schematic diagram of the optimized design and manufacturing system of the corrosion-resistant alloy structure of the dock folding device according to an embodiment of the present invention.

[0050] Figure 6 Schematic diagram of an electronic device according to an embodiment of the present invention. Detailed implementation manners

[0051] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0052] In the description of this specification, the descriptions referring to terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions 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 a suitable manner in any one or more embodiments or examples. In addition, without conflict, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0053] The microstructure inside the alloy fabricated by SLM (Selective Laser Melting) is different from that of the alloy produced by traditional processing techniques, which results in certain differences in their mechanical properties and corrosion resistance. In addition, seawater contains aggressive ions and has a certain hydrostatic pressure. Many studies have shown that hydrostatic pressure will accelerate the corrosion process of the alloy. This hydrostatic pressure is balanced and is very different from the influence of tensile or compressive stress on corrosion. Hydrostatic pressure has two effects on the alloy shell structure: one is to provide internal stress that deforms the material; the other is to accelerate the electrochemical process at the metal / solution interface. Therefore, hydrostatic pressure will produce an adverse synergistic effect on the metal surface and have a significant impact on the stress corrosion sensitivity of the metal. Microstructure and composition adjustment will introduce defects, promote galvanic corrosion, and lead to a decrease in corrosion resistance. In a seawater environment, these disadvantages may be amplified. At the same time, these additional elements introduced by metallography will inevitably be incorporated into the passive film during the passivation process.

[0054] The surface of the dock folding device is prone to corrosion in the seawater environment for a long time, which affects its service life. Moreover, structural components such as hydraulic components and support components also need to bear high pressure. Therefore, it is necessary to determine a method for observing the surface damage and corrosion process of structural components under high seawater pressure conditions, explore the microscopic mechanism analysis technology of material failure, reveal the inhibition mechanism of process parameters such as laser scanning path on the (electro)chemical corrosion and leakage of the material surface, and develop an effective method for in-situ regulating the surface anti-corrosion and anti-leakage performance during forming, so as to lay a foundation for the corrosion-resistant design and application of the alloy structure of the dock folding device.

[0055] Figure 1 This is a schematic diagram of the overall process of the alloy structure optimization design and manufacturing method according to an embodiment of the present invention. Refer to Figure 1 , the present invention provides a corrosion-resistant alloy structure optimization design and manufacturing method for a dock folding device, and the method includes:

[0056] By means of numerical simulation method, capture the evolution process of the alloy cross-section microstructure in seawater;

[0057] By regulating the alloy microstructure, surface free energy parameters, and corrosion environment and stress boundary conditions, calculate the corrosion potential, corrosion current density, and charge transfer resistance of the alloy under different conditions to measure the corrosion resistance of the alloy; in some embodiments, the corrosion environment and stress boundary conditions include corrosion medium, temperature, and stress boundary conditions;

[0058] Establish a quantitative relationship between the alloy microstructure, surface free energy, and corrosion resistance;

[0059] Screen alloys with high corrosion potential and low corrosion current density, as well as the corresponding microstructure and surface free energy, to obtain the target microstructure parameters and target surface free energy parameters of the alloy;

[0060] According to the target microstructure parameters, using preset 3D printing conditions, an alloy with a target microstructure is constructed by metal 3D printing;

[0061] Using preset pretreatment conditions, a dense oxide film is modified on the surface of the alloy by a pretreatment method; in some embodiments, the pretreatment method includes at least one of micro-arc oxidation method, anodic oxidation method, and hydrothermal oxidation method;

[0062] Using preset fluoroalkylsilane modification conditions, the alloy with the oxide film is modified by fluoroalkylsilane, thereby preparing a superhydrophobic alloy; in some embodiments, the fluoroalkylsilane includes perfluorooctyltriethoxysilane or perfluorodecyltrichlorosilane;

[0063] The microstructure parameters of the superhydrophobic alloy, the functional group content of the alloy, the composition of the oxide film, the seawater contact angle, and the surface free energy are detected by a detection device; thereby analyzing the influence laws of 3D printing conditions, pretreatment conditions, and fluoroalkylsilane modification conditions on the alloy microstructure, surface free energy, and hydrophobicity;

[0064] Optimize the alloy preparation conditions according to the influence laws.

[0065] In some embodiments of the present application, by exploring the failure mechanism of alloy stress corrosion in a seawater environment and the mechanism of passivation film degradation caused by the environmental sensitivity of alloy elements, the phase and composition design of corrosion-resistant alloys under high-pressure environments is guided, and the relationship between the phase composition, microstructure, corrosion behavior, and mechanical properties of the alloy is analyzed.

[0066] In some embodiments of the present application, the alloy includes one or more of aluminum alloy, copper alloy, stainless steel, and titanium alloy. For example, the support main body fixing structure of the folding device can be stainless steel, the materials of the dock piers that can be folded and erected include aluminum alloy or stainless steel, the precision valve bodies and hydraulic components, etc. can be copper alloy or titanium alloy, and the pulley is stainless steel.

[0067] The main component of the alloy passivation film is the oxide film. Figure 2 It is a schematic diagram of the corrosion mechanism of the alloy structure in an embodiment of the present invention under elastic stress. Refer to Figure 2 , taking titanium alloy as an example, the outermost layer of the oxide film is mainly composed of TiO2 (Ti 4+) It consists of [description of components], and the part close to the alloy matrix is mainly composed of Ti2O3 and TiO. Under the coupled action of elastic stress and electrochemical corrosion, corrosion ions tend to preferentially adhere to the defects on the surface of the alloy passive film, resulting in high current density at some local positions within the passive film, and pitting is more likely to occur in local areas. On the one hand, elastic stress mainly causes dislocations and even ruptures of the passive film, thereby increasing stress corrosion at the interface between the metal matrix and the corrosive medium. On the other hand, elastic stress causes metal deformation, making the alloy prone to form pits, especially under irregular geometric shapes and specific loading conditions, which in turn triggers pitting.

[0068] In some embodiments of the present application, the numerical simulation method includes molecular dynamics simulation method and finite element simulation method. Through the numerical simulation method, the evolution process of the microstructure of the alloy cross-section in seawater is captured.

[0069] Specifically, during the process of establishing the model, electrochemical reactions, the transfer of chemical substances, the deformation of metal corrosion, and the precipitation generated during the corrosion process can be considered. The finite element method is used to solve the internal reactions and transport problems in the corrosion reaction system. The calculation involving the obtained partial differential equations (PDEs) is carried out using the Comsol software program, which helps to solve such nonlinear problems. The main electrochemical reactions included in the model are:

[0070] Ti + 4H + →Ti 4+ + 2H2

[0071] Ti + 2H2O → TiO2 + 2H2

[0072] Mass conservation equation:

[0073] The corrosion reaction system and its environment may include the following ionic species: H + , OH - , Na + , Cl - , Ti, Ti(OH) 2+ , Ti(OH) 3+ , Ti(OH) 4+ . The Nernst - Planck equation includes diffusion and electro-migration and is the governing equation for different species in the solution. The formula for the change in the concentration of each substance i in the solution is as follows:

[0074]

[0075] In the formula, c i is the concentration of substance i, t is time, D i is the diffusion coefficient, z i is the charge number, F is the Faraday constant, φ is the electrolyte potential, R is the gas constant, T is the temperature, R iis the source term.

[0076] Charge conservation equation:

[0077] ∑z i c i = 0

[0078] Electrochemical parameters, including the equilibrium potential, exchange current density, and Tafel slope of the redox reaction used in the simulation, are known and can be optionally determined.

[0079] Figure 3 is a schematic diagram of the corrosion mechanism of the alloy structure of an embodiment of the present invention under plastic stress. Refer to Figure 3 , in some embodiments of the present application, two major types of stress corrosion mechanisms are considered: anodic dissolution at the crack tip and hydrogen embrittlement. When the alloy is subjected to an external stress in a corrosive medium, if the corrosion rate is not severe enough to passivate the crack tip, the crack will propagate into the metal, ultimately leading to mechanical failure. The second mechanism is hydrogen-assisted cracking. After hydrogen atoms are absorbed near the crack tip by the hydrogen precipitation cathode reaction, they will penetrate into the interior of the alloy, promoting embrittlement at the crack tip. Through the numerical simulation method of the present application, the plastic deformation in the crack tip region where corrosion occurs can be simulated more scientifically and objectively.

[0080] Alloys such as titanium alloys and aluminum alloys have advantages such as low density and high strength, but show electrochemical corrosion sensitivity in the marine environment. By constructing a superhydrophobic layer on the alloy surface, contact with the electrolyte solution can be avoided, improving corrosion resistance. The superhydrophobicity of this superhydrophobic layer is closely related to material parameters such as the alloy microstructure and surface free energy. In some embodiments of the present application, numerical simulation means are used to explore the alloy corrosion resistance mechanism from the microscale, quantitatively describe the effects of the alloy microstructure and surface free energy on its corrosion resistance, and thus guide alloy parameter optimization.

[0081] In some embodiments of the present application, based on a theoretical model, alloy structures with specific microstructures are manufactured by metal 3D printing, and their surface free energies are regulated by means such as fluorosilane modification. The influence laws of 3D printing conditions such as light intensity and printing speed and pretreatment methods, and fluorosilane modification conditions such as solution concentration and reaction temperature on the alloy microstructure and surface free energy are obtained. Combining theory and experiments, alloy structures with the best corrosion resistance are optimized, and the internal relationships and action mechanisms of processing conditions - microstructure, surface free energy - hydrophobicity - corrosion resistance are summarized.

[0082] According to the Cassie-baxter model, to construct an alloy with superhydrophobicity, two basic conditions need to be met: one is that the alloy surface must have a fine microstructure, and the other is that its surface free energy should be less than that of water. Metal 3D printing can precisely control the microstructure of the alloy surface and is one of the ideal additive manufacturing methods for constructing superhydrophobic alloys. At the same time, fluoroalkylsilane modification can effectively reduce the surface free energy of the alloy by modifying fluorinated alkyl chains. In the embodiments of this application, by quantifying the relationship between the superhydrophobicity and corrosion resistance of the alloy, the influence rules of the microstructure and surface free energy on the corrosion resistance performance are obtained, so as to optimize the alloy 3D printing conditions and fluoroalkylsilane modification conditions.

[0083] Specifically, in some embodiments of this application, methods such as molecular dynamics simulation and finite element simulation are used to capture the evolution process of the alloy cross-section microstructure in seawater. By regulating model and material parameters such as alloy microstructure, surface free energy, and phase composition, as well as boundary conditions such as corrosive medium, temperature, and stress, the corrosion potential, corrosion current density, and charge transfer resistance of the alloy under different conditions are calculated to measure the corrosion resistance of the alloy. A quantitative relationship between the alloy microstructure, surface free energy, and its corrosion resistance is established, and alloys with high corrosion potential and low corrosion current density, as well as their corresponding microstructures and surface free energies, are screened.

[0084] Figure 4 It is a schematic flow diagram of the method for manufacturing the corrosion-resistant surface of the alloy structure according to an embodiment of the present invention. Refer to Figure 4 , on this basis, a titanium alloy with a specific microstructure is constructed by metal 3D printing, and a dense oxide film is modified on its surface by pretreatment means such as micro-arc oxidation, anodic oxidation, and hydrothermal oxidation, and the alloy with the oxide film is modified by fluoroalkylsilanes such as perfluorooctyltriethoxysilane and perfluorodecyltrichlorosilane, so as to realize the preparation of superhydrophobic alloys.

[0085] In some embodiments, the microstructure parameters of the superhydrophobic alloy, the functional group content of the alloy, the composition of the oxide film, the seawater contact angle, and the surface free energy are detected by detection equipment, including:

[0086] The microstructure parameters of the superhydrophobic alloy are detected by a scanning electron microscope or a metallographic microscope;

[0087] The functional group content and oxide film composition parameters of the superhydrophobic alloy are detected by an X-ray photoelectron spectrometer, an X-ray diffractometer, and infrared spectroscopy;

[0088] The seawater contact angle and surface free energy of the superhydrophobic alloy are detected by a contact angle tester.

[0089] In the embodiments of the present application, the microstructure of the titanium alloy is characterized by a scanning electron microscope, a metallographic microscope, etc., the content of functional groups, the composition of the oxide film and other parameters of the titanium alloy are characterized by an X-ray photoelectron spectrometer, an X-ray diffractometer, an infrared spectrum, etc., the seawater contact angle and surface free energy are characterized by a contact angle measuring instrument, the influence laws of 3D printing conditions, pretreatment conditions and fluoroalkylsilane modification conditions on the alloy microstructure, surface free energy and hydrophobicity are explored, and the optimal preparation conditions are obtained by optimization.

[0090] In some embodiments, the method further includes:

[0091] The corrosion resistance of the superhydrophobic alloy is tested by a salt spray immersion test and an electrochemical test. The charge transfer resistance is characterized by testing and simulating the electrochemical impedance spectra of different superhydrophobic alloys; the steady-state electrochemical behavior is analyzed by potentiodynamic polarization testing, and the corrosion potential, corrosion current density, cathodic Tafel slope, anodic Tafel slope parameters of different superhydrophobic alloys are compared; specifically, a 3.5% NaCl solution with a pH of 8 is used to simulate the seawater environment as the corrosion resistance test medium for electrochemical testing;

[0092] Analyze the influence law of hydrophobicity on the corrosion behavior, so as to obtain the correlation between the construction method of the alloy - microstructure, surface free energy - hydrophobicity - corrosion resistance;

[0093] Optimize the target preparation conditions according to the correlation.

[0094] In the embodiments of the present application, the corrosion resistance of the titanium alloy specimen is tested by a salt spray immersion test and an electrochemical test. A 3.5% NaCl solution with a pH of 8 is used to simulate the seawater environment as the electrochemical corrosion test medium. The charge transfer resistance is characterized by testing and simulating the electrochemical impedance spectra of different alloy specimens, the steady-state electrochemical behavior is analyzed by potentiodynamic polarization testing, and the corrosion potential, corrosion current density, cathodic Tafel slope, anodic Tafel slope and other parameters of different specimens are compared, and the influence law of hydrophobicity on the corrosion behavior is analyzed. Finally, combined with theoretical simulation and experiments, the internal relationship between the construction method of the corrosion-resistant alloy - microstructure, surface free energy - hydrophobicity - corrosion resistance is obtained, providing guidance for the alloy modification design.

[0095] In some embodiments, the method further includes:

[0096] By adjusting the heat source and process parameters, the solidification of the alloy microstructure is changed, or by changing the scanning strategy and forming angle, the formation of different microstructure orientations is induced, and then the relationship between process parameters - microstructure - wear resistance and strength is analyzed. Combining the plastic failure mechanism of the microstructure, the microstructure is induced with performance as the goal, so as to achieve in-situ enhancement of wear resistance and strength.

[0097] During the metal additive manufacturing process, a high-energy laser beam rapidly heats the metal material above its melting point to become liquid metal, forming a liquid molten pool. As the laser moves, the melted metal material will rapidly solidify. Due to the point-by-point, line-by-line, and surface-by-surface processing methods, the material will repeatedly undergo the processes of rapid melting and rapid solidification. The process parameters of the forming process determine the energy absorption of the material during the sintering process and affect the melting, wetting, and spreading behaviors of the powder. Therefore, defects such as pores, balling, and holes often appear in metal additive manufacturing formed parts. The existence of these defects has an adverse impact on the wear resistance and strength of the parts. The selection of reasonable process parameters can minimize the generation of defects as much as possible, but for metal additive manufacturing formed parts, their wear resistance and strength still do not meet the standards of industrial applications. Further improvement of material properties is still required to meet the actual application requirements.

[0098] For parts processed by traditional methods, some physical and chemical surface technologies are often used to improve their surface properties. Among them, some surface post-treatment methods have been proven to be effective in improving the wear resistance of metal additive manufacturing parts. These methods include laser polishing, mechanical grinding, sandblasting and shot peening, surface texturing, coating, nitriding treatment, surface rolling, heat treatment and some other surface modification methods. The strength of metal additive manufacturing parts is mainly enhanced by heat treatment. Among these methods, mechanical grinding, sandblasting and shot peening, and surface rolling belong to the methods of cold plastic deformation. The compressive stress is mainly applied to the surface layer of the specimen through an external load, so that the microstructure below the specimen surface is refined, thereby improving the wear resistance. Laser polishing, heat treatment and nitriding change the microstructure or composition of the specimen through the action of heat. Coating is to directly cover the original specimen surface with a material with higher wear resistance, thereby changing the microstructure of the specimen surface. The implementation of these traditional post-treatment methods usually requires processing equipment other than the metal additive manufacturing forming equipment. The process of different post-treatment methods is relatively complex. Taking the direct current-assisted ultrasonic surface rolling processing technology (DC-USRP) as an example, its process parameters include spindle speed, rolling head diameter, rolling force, amplitude, ultrasonic frequency, etc. For the nitriding process, it includes nitriding temperature, gas ratio, nitriding time, voltage, etc. For the treatment of different materials, especially the materials formed by metal additive manufacturing, due to their unique microstructure, necessary process optimization and regulation are required. At the same time, the complex post-treatment process greatly increases the production cost and cycle of parts. More importantly, due to the limitations of their own processes, many post-treatment methods can only process some regular shapes such as rods and planes. For complex structures such as integrated hydraulic component structures, the post-treatment of irregular curved surfaces, inner holes and other structures is difficult. For heat treatment, although there is no restriction on the part structure, the deformation of parts will occur during the heat treatment process, affecting the dimensional accuracy of parts, and may cause difficulties in the assembly of precision parts.

[0099] Wear resistance and strength are ultimately manifestations of the material's ability to resist plastic deformation, and the material's ability to resist plastic deformation depends to a large extent on the microstructure. Microstructures such as the composition of phases, grain size and morphology, and element segregation greatly affect the performance of parts. In the embodiments of the present application, the performance of parts can be regulated by controlling and optimizing the microstructure. Specifically, by adjusting the heat source and process parameters, the solidification of the microstructure is changed, or by changing the scanning strategy, forming angle, etc., the formation of different microstructure orientations is induced, and then the relationship between process parameters - microstructure - performance (wear resistance and strength) is determined. On the basis of in-depth analysis of the plastic damage mechanism of the microstructure, the microstructure is induced with performance as the goal, so as to achieve in-situ enhancement of the wear resistance and strength of parts and reduce unnecessary subsequent processing.

[0100] In the embodiments of the present application, taking full advantage of the characteristics of metal additive manufacturing forming, compared with traditional processing methods, metal additive manufacturing forming gives a great deal of control space over the heat source. Using this characteristic allows for the direct regulation of the microstructure during the part forming process. In the embodiments of the present application, the performance is directly regulated during the part forming process, so as to directly obtain parts with high surface wear resistance and high strength, and reduce or eliminate the dependence of metal additive manufacturing parts on post-treatment methods as much as possible.

[0101] In some embodiments of the present application, for wear resistance, a nano-scratch test is used to reveal the material wear failure mechanism. Compared with reciprocating or rotating friction and wear tests, the scratch test method is more suitable for exploring the wear failure behavior of alloys. By setting different load magnitudes, the wear resistance of different microstructures is tested respectively. The corresponding wear amount is measured and calculated by a confocal microscope to evaluate the wear resistance differences of different microstructures. A scanning electron microscope is used to observe the wear scar morphology, observe the plastic damage condition on the material surface, analyze the deformation behavior of different microstructures, and observe the generation and propagation of crack defects, so as to obtain the wear failure mechanism of cellular substructures, grain morphology and grain orientation under different loads.

[0102] In some embodiments of the present application, for strength, according to the test standard GB / T 228.1-2010, a tensile testing machine is used for testing. Before testing, the grains in the deformation area are calibrated, and the morphology of the grains under different strains is measured. By comparing the morphologies under different strains, the plastic deformation behavior of the grains during the tensile process is analyzed. On the other hand, a scanning electron microscope is used to observe the fracture surface of the specimen after fracture, and analyze the influence of different cellular substructures and melt pools on the generation of defects.

[0103] In the embodiments of the present application, by directly regulating the performance during the part forming process, parts with high surface wear resistance and high strength are directly obtained, and the dependence of metal additive manufacturing parts on post-treatment methods is reduced or eliminated as much as possible.

[0104] Figure 5 Schematic diagram of an optimized design and manufacturing system for the corrosion-resistant alloy structure of a dock folding device according to an embodiment of the present invention. Refer to Figure 5 , in some embodiments of the present application, an optimized design and manufacturing system for the corrosion-resistant alloy structure of a dock folding device is further provided. The system includes:

[0105] A numerical simulation module, which captures the evolution process of the alloy cross-section microstructure in seawater by numerical simulation methods;

[0106] The corrosion resistance quantitative relationship establishment module calculates the corrosion potential, corrosion current density, and charge transfer resistance of the alloy under different conditions by regulating the alloy microstructure, surface free energy parameters, corrosion environment, and stress boundary conditions, and is used to measure the corrosion resistance of the alloy; establish the quantitative relationship between the alloy microstructure, surface free energy, and corrosion resistance;

[0107] The target parameter acquisition module screens alloys with high corrosion potential and low corrosion current density and their corresponding microstructures and surface free energies to obtain the target microstructure parameters and target surface free energy parameters of the alloy;

[0108] The 3D printing module constructs an alloy with a target microstructure by metal 3D printing according to the target microstructure parameters using preset 3D printing conditions;

[0109] The pretreatment module modifies a dense oxide film on the surface of the alloy by a pretreatment method using preset pretreatment conditions;

[0110] The modification module modifies the alloy with the oxide film by fluorosilane using preset fluorosilane modification conditions to prepare a superhydrophobic alloy;

[0111] The detection module detects the microstructure parameters of the superhydrophobic alloy, the functional group content of the alloy, the composition of the oxide film, the seawater contact angle, and the surface free energy through detection equipment; thereby analyzing the influence laws of 3D printing conditions, pretreatment conditions, and fluorosilane modification conditions on the alloy microstructure, surface free energy, and hydrophobicity;

[0112] The optimization module optimizes the alloy preparation conditions according to the influence laws;

[0113] The corrosion-resistant alloy structure optimization design and manufacturing system of the dock folding device is used to implement the above manufacturing method.

[0114] The corrosion-resistant alloy structure optimization design and manufacturing system of the dock folding device can be an integrated manufacturing platform. It may include electronic equipment.

[0115] Reference Figure 6 , in some embodiments, there is also provided an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, it implements the numerical simulation, analysis, or control steps in any one of the above methods.

[0116] At the hardware level, the electronic device includes a processor, an internal bus, a network interface, a memory, and a non-volatile memory. Of course, it may also include other hardware required for other services. The processor reads the corresponding computer program from the non-volatile memory into the memory and then runs it to implement the aboveFigure 1 The alloy structure optimization design and manufacturing method described above. Of course, in addition to the software implementation method, this specification does not exclude other implementation methods, such as logic devices or the combination of software and hardware, etc. That is to say, the execution subject of the following processing flow is not limited to each logic unit, and can also be hardware or logic devices. It can be understood that as long as the method flow is slightly logically programmed with a hardware description language and programmed into an integrated circuit, a hardware circuit for implementing the logic method flow can be obtained.

[0117] The above method can be implemented by the controller in any suitable manner. For example, the controller can take the form of, for example, a microprocessor or a processor and a computer-readable medium storing computer-readable program code (such as software or firmware) executable by the (micro)processor, logic gates, switches, application-specific integrated circuits (ASICs), programmable logic controllers, and embedded microcontrollers. Examples of the controller include, but are not limited to, microcontrollers. The memory controller can also be implemented as part of the control logic of the memory. It can be understood that in addition to implementing the controller in the form of pure computer-readable program code, the method steps can be logically programmed to enable the controller to be implemented in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers, etc., to achieve the same function. Therefore, such a controller can be regarded as a hardware component, and the devices included therein for implementing various functions can also be regarded as the structures within the hardware component. Or even, the devices for implementing various functions can be regarded as either software modules for implementing the method or the structures within the hardware component.

[0118] The systems, devices, modules, or units in the above embodiments can be specifically implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, the computer can be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a game console, a tablet computer, a wearable device, or any combination of these devices.

[0119] For the convenience of description, when describing the above devices, they are described separately as various modules according to their functions. Of course, when implementing this specification, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0120] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, this specification can take the form of an all-hardware embodiment, an all-software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0121] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of this specification. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the specified functions in Figure 1 one or more of the processes Figure 1 or multiple processes and / or blocks

[0122] In some embodiments, a computer-readable storage medium is also provided, and the storage medium stores a computer program, and when the computer program is executed by a processor, the method described in any one of the above is implemented.

[0123] In some embodiments, these computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device, and the instruction device implements the specified functions in Figure 1 one or more of the processes Figure 1 or multiple processes and / or blocks

[0124] In some embodiments, these computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the specified functions in Figure 1 one or more of the processes Figure 1 or multiple processes and / or blocks

[0125] In some embodiments, the computing device includes one or more processors (CPUs), an input / output interface, a network interface, and a memory.

[0126] In some embodiments, the memory may include non-permanent memory in the form of computer-readable media, random access memory (RAM) and / or non-volatile memory such as read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0127] In some embodiments, computer-readable media includes both permanent and non-permanent, removable and non-removable media implemented by any method or technology for storing information. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile discs (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission media that can be used to store information that can be accessed by a computing device.

[0128] Those skilled in the art will readily understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for optimizing the design and manufacturing of a corrosion-resistant alloy structure of a dock folding device, characterized in that, The method includes: Capturing the evolution process of the microstructure of the alloy cross-section in seawater through numerical simulation methods; Calculating the corrosion potential, corrosion current density, and charge transfer resistance of the alloy under different conditions by regulating the alloy microstructure, surface free energy parameters, corrosion environment, and stress boundary conditions to measure the corrosion resistance of the alloy; Establishing a quantitative relationship between the alloy microstructure, surface free energy, and corrosion resistance; Screening alloys with high corrosion potential and low corrosion current density and their corresponding microstructures and surface free energies to obtain the target microstructure parameters and target surface free energy parameters of the alloy; According to the target microstructure parameters, using preset 3D printing conditions, constructing an alloy with a target microstructure through metal 3D printing; Using preset pretreatment conditions, modifying a dense oxide film on the surface of the alloy through a pretreatment method; Using preset fluoroalkylsilane modification conditions, modifying the alloy with the oxide film through fluoroalkylsilane to prepare a superhydrophobic alloy; Detecting the microstructure parameters of the superhydrophobic alloy, the functional group content of the alloy, the composition of the oxide film, the seawater contact angle, and the surface free energy through a detection device; thereby analyzing the influence rules of 3D printing conditions, pretreatment conditions, and fluoroalkylsilane modification conditions on the alloy microstructure, surface free energy, and hydrophobicity; Optimizing the alloy preparation conditions according to the influence rules.

2. The method for optimizing the design and manufacturing of a corrosion-resistant alloy structure according to claim 1, characterized in that, The alloy includes one or more of aluminum alloy, copper alloy, stainless steel, and titanium alloy.

3. The method for optimizing the design and manufacturing of a corrosion-resistant alloy structure according to claim 2, characterized in that, The numerical simulation method includes molecular dynamics simulation method and finite element simulation method.

4. The method for optimizing the design and manufacturing of a corrosion-resistant alloy structure according to claim 3, characterized in that The corrosion environment and stress boundary conditions include corrosion medium, temperature, and stress boundary conditions.

5. The method for optimizing the design and manufacturing of a corrosion-resistant alloy structure according to claim 4, characterized in that, The pretreatment method includes at least one of micro-arc oxidation method, anodic oxidation method, and hydrothermal oxidation method; the fluoroalkylsilane includes perfluorooctyltriethoxysilane or perfluorodecyltrichlorosilane.

6. The method for optimizing the design and manufacturing of a corrosion-resistant alloy structure according to claim 5, characterized in that, Detecting the microstructure parameters of the superhydrophobic alloy, the functional group content of the alloy, the composition of the oxide film, the seawater contact angle, and the surface free energy through a detection device, including: Detecting the microstructure parameters of the superhydrophobic alloy through a scanning electron microscope or a metallurgical microscope; Detecting the functional group content and oxide film composition parameters of the superhydrophobic alloy through X-ray photoelectron spectroscopy, X-ray diffractometer, and infrared spectroscopy; Detecting the seawater contact angle and surface free energy of the superhydrophobic alloy through a contact angle tester.

7. The method for optimizing the design and manufacturing of a corrosion-resistant alloy structure according to claim 6, characterized in that The method further includes: Testing the corrosion resistance of the superhydrophobic alloy through salt spray immersion test and electrochemical test, and characterizing the charge transfer resistance by testing and simulating the electrochemical impedance spectra of different superhydrophobic alloys; Analyzing the steady-state electrochemical behavior through potentiodynamic polarization test, and comparing the corrosion potential, corrosion current density, cathodic Tafel slope, and anodic Tafel slope parameters of different superhydrophobic alloys; Analyzing the influence rules of hydrophobicity on corrosion behavior to obtain the correlation between the alloy construction method - microstructure, surface free energy - hydrophobicity - corrosion resistance; Optimizing the target preparation conditions according to the correlation.

8. The method for optimizing the design and manufacturing of a corrosion-resistant alloy structure according to claim 7, characterized in that, Using a 3.5% NaCl solution with a pH of 8 to simulate the seawater environment as the corrosion resistance test medium for electrochemical testing.

9. The method for optimizing the design and manufacturing of a corrosion-resistant alloy structure according to claim 8, characterized in that, The method further includes: By adjusting the heat source and process parameters to change the solidification of the alloy microstructure, or by changing the scanning strategy and forming angle to induce the formation of different microstructure orientations, the relationship among process parameters - microstructure - wear resistance and strength is analyzed. Combining with the plastic failure mechanism of the microstructure, the microstructure is induced with performance as the goal, so as to achieve in-situ enhancement of wear resistance and strength.

10. An optimized design and manufacturing system for the corrosion-resistant alloy structure of a dock folding device, characterized in that, The system includes: A numerical simulation module that captures the evolution process of the alloy cross-section microstructure in seawater by numerical simulation methods; A corrosion resistance quantitative relationship establishment module that calculates the corrosion potential, corrosion current density and charge transfer resistance of the alloy under different conditions by regulating the alloy microstructure, surface free energy parameters, and corrosion environment and stress boundary conditions to measure the corrosion resistance of the alloy; and establishes a quantitative relationship between the alloy microstructure, surface free energy and corrosion resistance; A target parameter acquisition module that screens alloys with high corrosion potential and low corrosion current density and their corresponding microstructures and surface free energies to obtain the target microstructure parameters and target surface free energy parameters of the alloy; A 3D printing module that constructs an alloy with a target microstructure by metal 3D printing according to the target microstructure parameters using preset 3D printing conditions; A pretreatment module that modifies a dense oxide film on the surface of the alloy by a pretreatment method using preset pretreatment conditions; A modification module that modifies the alloy with the oxide film by fluorosilane using preset fluorosilane modification conditions to prepare a superhydrophobic alloy; A detection module that detects the microstructure parameters of the superhydrophobic alloy, the functional group content of the alloy, the composition of the oxide film, the seawater contact angle and the surface free energy through detection equipment; thereby analyzing the influence laws of 3D printing conditions, pretreatment conditions and fluorosilane modification conditions on the alloy microstructure, surface free energy and hydrophobicity; An optimization module that optimizes the alloy preparation conditions according to the influence laws.

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