Pretreatment method for titanium alloy structural part before pickling

Abstract

The invention discloses a pretreatment method before pickling of a titanium alloy structural part. The pretreatment method before pickling of the titanium alloy structural part comprises the following steps that the surface of the titanium alloy structural part is wiped through a metal cleaning agent solution; the wiped titanium alloy structural part is placed in an ultrasonic cleaning tank containing an ultrasonic cleaning solution to be cleaned; injecting alcohol into the threaded blind hole of the cleaned titanium alloy structural part until the liquid level of the alcohol is higher than or equal to 3 / 4 of the depth of the threaded blind hole; a drill bit of drill bit cleaning equipment extends into the threaded blind hole, and the threaded blind hole is cleaned; and the surface, the welding seam, the threaded blind hole and / or the pin hole of the titanium alloy structural part are cleaned through saturated steam equipment till the titanium alloy structural part is completely cleaned. The method of cleaning agent wiping, ultrasonic cleaning and saturated steam cleaning is utilized to ensure that redundant substances such as oil stains and oxides are completely removed, and the requirement of clean pretreatment is met.

Description

Technical Field

[0001] This application belongs to the field of metal material processing and manufacturing technology, specifically relating to a pretreatment method for titanium alloy structural parts before pickling. Background Technology

[0002] Titanium alloy structural components are formed by welding, heat treatment and machining. The inner cavity is used to install high-sensitivity optical instruments, so the cleanliness requirements for titanium alloy structural components are extremely high. Titanium alloy structural components are composed of multiple cavities, multiple welds, a large number of threaded blind holes and pin holes. The structure is complex and has many dead corners. Conventional cleaning processes may still leave grease and solid contaminants, making it difficult to achieve the cleanliness level required for assembly.

[0003] In addition, the substrate surface of titanium alloy structural parts is also distributed with many high-precision assembly surfaces and high-precision threaded blind holes. Although pickling can remove oxide layers and residual contaminants, strong corrosive media can easily cause dimensional deviations, making it impossible to guarantee the geometric accuracy of key mating surfaces. Summary of the Invention

[0004] To address the technical challenge of ensuring dimensional accuracy and preventing acid corrosion of titanium alloy structural components during pickling, this application provides a pretreatment method for titanium alloy structural components before pickling.

[0005] In a first aspect of this application, a pretreatment method for a titanium alloy structural component before pickling is provided. The titanium alloy structural component includes a substrate and a plurality of wall plates connected to the substrate. The substrate and the wall plates are provided with a plurality of threaded blind holes, a plurality of pin holes and a plurality of mounting bosses. The pretreatment method for titanium alloy structural parts before pickling includes the following steps: Wipe the surface of the titanium alloy structural component with a metal cleaning solution; The wiped titanium alloy structural component is placed in an ultrasonic cleaning tank containing ultrasonic cleaning solution for cleaning. Inject alcohol into the threaded blind hole of the cleaned titanium alloy structural component until the alcohol level is higher than or equal to 3 / 4 of the hole depth. The drill bit of the drill bit cleaning equipment is inserted into the threaded blind hole and the threaded blind hole is cleaned; The surface, welds, threaded blind holes, and / or pin holes of the titanium alloy structural component are cleaned using a saturated steam device until the titanium alloy structural component is completely cleaned.

[0006] In some embodiments, the metal cleaning agent solution is prepared by dissolving the metal cleaning agent in water at 40°C to 60°C to prepare a metal cleaning agent solution of 1 g / L to 5 g / L.

[0007] In some embodiments, the ultrasonic cleaning solution comprises the following components at concentrations of: 40 g / L to 50 g / L trisodium phosphate, 20 g / L to 30 g / L sodium carbonate, and 15 g / L to 25 g / L sodium silicate.

[0008] In some embodiments, the ultrasonic cleaning tank has a cleaning temperature of 5°C to 40°C and a cleaning time of 10 min to 20 min.

[0009] In some embodiments, the ultrasonic cleaning tank has a plurality of ultrasonic transducers on its walls and / or bottom, and the distance between the titanium alloy structural component and the ultrasonic transducers is greater than or equal to 100 mm.

[0010] In some embodiments, alcohol is injected into the threaded blind hole of the cleaned titanium alloy structural component, specifically including the following steps: Inject 75% alcohol into the threaded blind holes of the cleaned titanium alloy structural component using a syringe, and soak for 10 to 20 minutes.

[0011] In some embodiments, the drill bit of the drill bit cleaning device is made of silicon carbide; The drill bit of the drill bit cleaning device is smaller than the size of the corresponding threaded blind hole, so that the drill bit of the drill bit cleaning device extends into the bottom of the corresponding threaded blind hole.

[0012] In some embodiments, the saturated steam equipment is provided with a blind-hole cleaning head and a flat cleaning head; When the saturated steam equipment includes a blind hole cleaning head, the saturated steam equipment cleans the threaded blind hole, and the blind hole cleaning head of the saturated steam equipment extends into the threaded blind hole to a depth of 1 / 3 to 1 / 2, and the cleaning time for each threaded blind hole is greater than or equal to 30 seconds; When the saturated steam equipment includes a flat cleaning head, the saturated steam equipment cleans the surface, weld and / or pin hole of the titanium alloy structural component; the distance between the flat cleaning head of the saturated steam equipment and the surface, weld and / or pin hole of the titanium alloy structural component is 50mm to 150mm, and the moving speed of the saturated steam equipment is 10cm / s to 20cm / s.

[0013] In some embodiments, the pretreatment method for titanium alloy structural components before pickling further includes the following steps after the titanium alloy structural components have been completely cleaned: The threaded blind hole is protected by a first protective component; The pin hole is protected by a second protective component; The mounting boss is protected by a third protective component.

[0014] In some embodiments, the first protective component is a titanium alloy screw; The specific method of protecting the threaded blind hole with the first protective component is as follows: the titanium alloy screw is wrapped with polytetrafluoroethylene tape for 3 to 5 turns, and then screwed into the corresponding threaded blind hole. The second protective component is a rubber rope; The pin hole is protected by the second protective component by wrapping the rubber rope with polytetrafluoroethylene tape 3 to 5 times and then inserting it into the corresponding pin hole. The third protective component is a protective adhesive; The specific method of protecting the mounting boss with a third protective component is as follows: apply two or more layers of protective adhesive to the surface of the mounting boss, with each layer of protective adhesive having a thickness of 0.5mm to 1.0mm and an interval of 6h to 12h between layers.

[0015] According to one or more embodiments of this application, a pretreatment method for pickling titanium alloy structural components is provided. The titanium alloy structural component includes a substrate and several wall plates connected to the substrate. Both the substrate and the wall plates are provided with several threaded blind holes, several pin holes, and several mounting bosses. The pretreatment method for pickling titanium alloy structural components includes the following steps: wiping the surface of the titanium alloy structural component with a metal cleaning agent solution; placing the wiped titanium alloy structural component in an ultrasonic cleaning tank containing an ultrasonic cleaning solution for cleaning; injecting alcohol into the threaded blind holes of the cleaned titanium alloy structural component until the alcohol level is higher than or equal to 3 / 4 of the hole depth; inserting a drill bit of a drill bit cleaning device into the threaded blind holes and cleaning the threaded blind holes; cleaning the surface, welds, threaded blind holes, and / or pin holes of the titanium alloy structural component with a saturated steam device until the titanium alloy structural component is completely cleaned. By performing rough and fine cleaning on titanium alloy structural components, followed by deep cleaning of the threaded blind holes of each component, and then further fine cleaning of the surface, welds, threaded blind holes, and / or pin holes of the titanium alloy structural components using saturated steam equipment, the high precision surface and threaded hole precision of the titanium alloy structural components can be guaranteed. The methods of wiping with cleaning agents, ultrasonic cleaning, and saturated steam cleaning ensure that oil stains, oxides, and other excess substances are completely removed, meeting the requirements of clean pretreatment. Attached Figure Description

[0016] Figure 1 A flowchart of a pretreatment method for titanium alloy structural parts before pickling is shown in one or more embodiments of this application.

[0017] Figure 2 It shows Figure 1 A schematic diagram of the structure of the titanium alloy structural component.

[0018] Explanation of reference numerals in the attached drawings: 100-Titanium alloy structural component, 110-Base plate, 120-Wall panel, 130-Threaded blind hole, 140-Pin hole, 150-Mounting boss. Detailed Implementation

[0019] To enable those skilled in the art to more clearly understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] Please see Figure 1 and Figure 2 According to the first aspect of this application, a pretreatment method for a titanium alloy structural component 100 before pickling is provided. The titanium alloy structural component 100 includes a substrate 110 and a plurality of wall plates 120 connected to the substrate 110. The substrate 110 and the wall plates 120 are provided with a plurality of threaded blind holes 130, a plurality of pin holes 140 and a plurality of mounting bosses 150. The pretreatment method for titanium alloy structural components before pickling (100%) includes the following steps: S100: Wipe the surface of the titanium alloy structural component 100 with a metal cleaning solution; It is understandable that the surface of the titanium alloy structural component 100 is prone to residual metal shavings, cutting fluid, grease and other waste. Therefore, rough cleaning with a metal cleaning agent solution can remove grease, marks, dust and some oxides, thereby obtaining a hydrophilic surface with fewer stains and a continuous water film, providing a basic level of cleanliness for the subsequent fine cleaning of the titanium alloy structural component 100.

[0021] S200: Place the wiped titanium alloy structural component 100 into an ultrasonic cleaning tank containing ultrasonic cleaning solution for cleaning. Understandably, an ultrasonic cleaning tank can transmit high-frequency vibrations of 20~40 kHz to the liquid through a radiating plate, forming micron-sized cavitation bubbles during the negative half-cycle. After the bubbles grow to the resonant size, they collapse instantly, generating micro-jet streams that break and peel off oil films, particles, and oxide scale from the workpiece surface, welds, and blind holes. At the same time, the acoustic streams quickly carry away the contaminants, which are then emulsified and dispersed by the ultrasonic cleaning solution, thereby achieving a 100% high-precision surface cleaning of titanium alloy structural parts.

[0022] S300: Inject alcohol into the threaded blind hole 130 of the cleaned titanium alloy structural component 100 until the alcohol level is higher than or equal to 3 / 4 of the hole depth of the threaded blind hole 130. It is understandable that alcohol has low surface tension and strong oleophilicity. Injecting alcohol into the threaded blind hole 130 of the titanium alloy structural component 100 can displace the residual water film in the threaded blind hole 130, dissolve and remove some of the grease, thereby achieving the purpose of cleaning the threaded blind hole 130.

[0023] S400: Insert the drill bit of the drill bit cleaning equipment into the threaded blind hole 130 and clean the threaded blind hole 130; Understandably, injecting alcohol into the threaded blind hole 130 can initially dissolve the grease within it. To further improve the cleanliness of the threaded blind hole 130, a drill bit from a drill bit cleaning device is inserted into the threaded blind hole 130, and the hole is then thoroughly cleaned using the device. This ensures that the threaded blind hole 130 achieves the desired level of cleanliness.

[0024] S500: Clean the surface, welds, threaded blind holes 130 and / or pin holes 140 of the titanium alloy structural component 100 with saturated steam until the titanium alloy structural component 100 is completely cleaned.

[0025] Understandably, after cleaning the blind thread hole 130, the alcohol will evaporate, leaving minimal residue. However, during the cleaning process with the drill bit cleaning equipment, some debris or impurities will overflow from the blind thread hole 130 and spray into the surrounding area, thus affecting the overall cleanliness of the titanium alloy structural component 100. Therefore, after cleaning the blind thread hole 130, a saturated steam device should be used to thoroughly clean the surface, welds, blind thread hole 130, and / or pin hole 140 of the titanium alloy structural component 100. This will remove any residue from the titanium alloy structural component 100, achieving complete cleaning and ensuring its cleanliness.

[0026] The titanium alloy structural component 100 of this application is used to install optical instruments. The installation of optical instruments has high requirements for installation accuracy and surface cleanliness (Class 1000 cleanroom). The installation accuracy is: blind hole accuracy within 10μm and installation surface flatness of 3μm; the surface cleanliness is Class 1000 cleanroom, that is, surface particles ≥ 5 µm and surface particles ≤ 10 particles / cm².

[0027] The number of threaded blind holes 130 on the surfaces of the substrate 110 and the wall panel 120 is close to a thousand, and the mounting bosses 150 have high flatness requirements. After the substrate 110 and the wall panel 120 have undergone welding, machining, heat treatment and annealing processes, metal shavings, cutting fluid, grease and other residues are easily left in the welds and blind holes before pickling. If the residues are not treated in time, the cleanliness requirements cannot be met after pickling.

[0028] Therefore, by performing rough cleaning and fine cleaning on the titanium alloy structural component 100, and then performing deep cleaning on each of the threaded blind holes 130 of the titanium alloy structural component 100, and then performing a second fine cleaning on the surface, weld, threaded blind holes 130 and / or pin holes 140 of the titanium alloy structural component 100 using saturated steam equipment, it is possible to ensure that the high-precision surface of the titanium alloy structural component 100 and the precision of the threaded holes are controlled. The methods of wiping with cleaning agents, ultrasonic cleaning, and saturated steam cleaning ensure that oil stains, oxides and other excess substances are completely removed, thus meeting the requirements of clean pretreatment.

[0029] In some embodiments, the metal cleaning agent solution is prepared by dissolving the metal cleaning agent in water at 40℃ to 60℃ to prepare a metal cleaning agent solution of 1 g / L to 5 g / L. The metal cleaning agent can be dissolved in hot water at 40℃ to 60℃, i.e., the metal cleaning agent can be dissolved in hot water at 40℃, 42℃, 45℃, 50℃, 55℃, or 60℃. Dissolving the metal cleaning agent in hot water to prepare a concentration of 1 g / L, 2 g / L, 3 g / L, 4 g / L, or 5 g / L can improve the cleaning ability of the metal cleaning agent. The metal cleaning agent is dissolved in hot water at 40℃ to 60℃, with a concentration of 1 g / L to 5 g / L; a clean cloth is soaked in the cleaning agent for 1 minute, and then the clean cloth is used to wipe the surface of the structural component twice.

[0030] In some embodiments, the ultrasonic cleaning solution comprises the following components at concentrations: 40 g / L to 50 g / L trisodium phosphate, 20 g / L to 30 g / L sodium carbonate, and 15 g / L to 25 g / L sodium silicate. Trisodium phosphate can provide PO4. 3- It can hydrolyze and saponify the fatty acid glycerides in mineral oil; sodium carbonate provides CO3. 2- It can react with fatty acids to form water-soluble soaps, synergistically promoting the rapid detachment of the oil film from the surface of the titanium alloy structural component 100, resulting in a high degreasing rate. Sodium silicate can form negatively charged SiO3. 2- Micelles, being electrically similar to and repelled by the TiO2 oxide film, reduce the re-adsorption of oil droplets and solid particles, while simultaneously complexing Ca... 2+ / Mg 2+ It inhibits hard water sedimentation and further improves detergency and ultrasonic stability.

[0031] In some embodiments, the ultrasonic cleaning solution comprises components of the following concentrations: 40 g / L trisodium phosphate, 20 g / L sodium carbonate, and 15 g / L sodium silicate; or 45 g / L trisodium phosphate, 25 g / L sodium carbonate, and 20 g / L sodium silicate; or 50 g / L trisodium phosphate, 30 g / L sodium carbonate, and 25 g / L sodium silicate.

[0032] In some embodiments, the cleaning temperature of the ultrasonic cleaning tank is 5℃~40℃, and the cleaning time is 10min~20min. The cleaning temperature of the ultrasonic cleaning tank can be 5℃, 15℃, 22.5℃, 30℃, 35℃ or 40℃, and the cleaning time can be 10min, 15min or 20min. This application uses a trisodium cleaning solution composed of trisodium phosphate, sodium carbonate and sodium silicate. At low temperature and short time, it can achieve the effect of "low viscosity and high gas solubility", thereby enabling faster saponification rate to peel off the oil film and improve the detergency. Compared with traditional high-temperature processes, it has energy-saving effects and avoids zero-dimensional damage. While ensuring the high precision of titanium alloy, it improves the cleanliness of titanium alloy structural parts 100 and meets the requirements of green production.

[0033] In some embodiments, the ultrasonic cleaning tank has a plurality of ultrasonic transducers on its walls and / or bottom, and the distance between the titanium alloy structural component 100 and the ultrasonic transducers is greater than or equal to 100 mm. The ultrasonic transducers, arranged on the walls and bottom of the ultrasonic cleaning tank, generate horizontal traveling waves on the walls and vertical radiation on the bottom. The interference of these waves creates a uniform sound intensity distribution throughout the entire depth direction, ensuring high-cleanliness cleaning. During actual cleaning, the titanium alloy structural component 100 is suspended by a lifting device, and the distance between the titanium alloy structural component 100 and the ultrasonic transducers is greater than or equal to 100 mm, preventing localized corrosion or impact damage. In other words, while ensuring high-cleanliness cleaning of the titanium alloy structural component 100 by ultrasonic waves, damage to the titanium alloy structural component 100 is avoided.

[0034] In some embodiments, injecting alcohol into the threaded blind hole 130 of the cleaned titanium alloy structural component 100 specifically includes the following steps: Inject 75% alcohol into the threaded blind hole 130 of the cleaned titanium alloy structural component 100 using a syringe, and soak for 10 to 20 minutes. The soaking time can be 10, 15, 18, or 20 minutes. 75% alcohol can enhance the detergency of oil stains. After soaking, the contact time between the alcohol and the oil stains can be fully increased, further improving the detergency.

[0035] In some embodiments, the drill bit of the drill bit cleaning equipment is made of silicon carbide; silicon carbide has high hardness, is wear-resistant and corrosion-resistant. Furthermore, it will not generate excess material due to wear during the cleaning process, thus not affecting the cleanliness of the cleaning.

[0036] In some embodiments, the size of the drill bit in the drill bit cleaning device is smaller than the size of the corresponding threaded blind hole 130, so that the drill bit of the drill bit cleaning device extends into the bottom of the corresponding threaded blind hole 130. That is, the drill bit of the drill bit cleaning device is inserted into the bottom of the corresponding threaded blind hole 130. Inserting the drill bit to the bottom of the hole removes metal shavings and dried grease, ensuring the contact area between the drill bit of the drill bit cleaning device and the threaded blind hole 130, ensuring the root of the threaded blind hole 130 is cleaned, and improving cleaning efficiency.

[0037] In some embodiments, the saturated steam equipment is equipped with a blind hole cleaning head and a flat cleaning head; wherein the blind hole cleaning head can be used to clean the threaded blind holes 130, and the flat cleaning head can be used to clean the surface and / or welds of the titanium alloy structural component 100. After the above-mentioned rough cleaning, fine cleaning and cleaning of the threaded blind holes 130 of the titanium alloy structural component 100, the titanium alloy structural component 100 is cleaned again by the saturated steam equipment, so as to remove the residue again and achieve the purpose of cleaning.

[0038] In some embodiments, when the saturated steam equipment includes a blind hole cleaning head, the saturated steam equipment cleans the threaded blind holes 130. The blind hole cleaning head of the saturated steam equipment extends into the threaded blind holes 130 to a depth of 1 / 3 to 1 / 2, and the cleaning time for each threaded blind hole 130 is greater than or equal to 30 seconds. The blind hole cleaning head of the saturated steam equipment can extend into the threaded blind holes 130 to a depth of 1 / 3, 5 / 12, or 1 / 2, to achieve the purpose of thoroughly cleaning the threaded blind holes 130.

[0039] In some embodiments, when the saturated steam equipment includes a flat cleaning head, the saturated steam equipment cleans the surface, welds, and / or pin holes of the titanium alloy structural component 100. The distance between the flat cleaning head of the saturated steam equipment and the surface, welds, and / or pin holes of the titanium alloy structural component 100 is 50mm to 150mm, and the moving speed of the saturated steam equipment is 10cm / s to 20cm / s. This allows for thorough cleaning of the large surfaces of the titanium alloy structural component 100, thereby achieving cleaning of the titanium alloy structure. The moving speed of the saturated steam equipment (10cm / s to 20cm / s) can be used to clean twice, and the threaded holes are checked with cotton swabs until no black marks remain.

[0040] In some embodiments, the pretreatment method for titanium alloy structural component 100 before pickling further includes the following steps after the titanium alloy structural component 100 has been completely cleaned: S600: The threaded blind hole 130 is protected by the first protective element; Understandably, before pickling, the threaded blind hole 130 needs to be protected to prevent corrosion of the threaded blind hole 130 after pickling, which would affect the accuracy. Therefore, the threaded blind hole 130 is protected by the first protective component to achieve the purpose of sealing.

[0041] Specifically: the first protective component is a titanium alloy screw; the threaded blind hole 130 is protected by the first protective component by wrapping the titanium alloy screw with PTFE tape 3 to 5 times, and then screwing it into the corresponding threaded blind hole 130; thus, the threaded blind hole 130 can be sealed. After wrapping the threaded part with clean PTFE tape 3 times, screw the screw into the threaded hole more than 5 turns, and remove the excess PTFE tape.

[0042] S700: The pin hole 140 is protected by a second protective component; Understandably, before pickling, the pin hole 140 needs to be protected to prevent corrosion of the pin hole 140 after pickling, which would affect the accuracy. Therefore, the pin hole 140 is protected by a second protective component to achieve the purpose of sealing.

[0043] Specifically, the second protective component is a rubber rope; the rubber rope acts as a rubber plug. Protecting the pin hole 140 with the second protective component involves wrapping the rubber rope around a piece of PTFE tape 3 to 5 times, then inserting it into the corresponding pin hole 140; this seals the pin hole 140. When using a rubber rope to protect the pin hole, before use, wrap it around the hole 3 to 5 times with clean PTFE tape, then insert it into the corresponding pin hole, removing any excess PTFE tape.

[0044] S800: The mounting boss 150 is protected by a third protective component.

[0045] Understandably, the mounting boss 150 needs to be protected before pickling to prevent corrosion of the mounting boss 150 after pickling, which would affect the accuracy. Therefore, the pin hole 140 is protected by a third protective component to achieve the purpose of sealing.

[0046] Specifically, the third protective component is a protective adhesive. Protecting the mounting boss 150 using this third protective component involves applying two or more layers of protective adhesive to the surface of the mounting boss 150. Each layer of adhesive is 0.5mm to 1.0mm thick, with an interval of 6 to 12 hours between layers. Two, three, or four layers of protective adhesive can be applied, with intervals of 6, 8, 10, or 12 hours between each layer. The thickness of each layer is 0.5mm, 0.7mm, 0.75mm, 0.9mm, or 1.0mm, respectively, to improve the protective effect. After the above cleaning treatment, the workpiece can undergo routine pickling, passivation, and other subsequent processes.

[0047] Through the above embodiments, this application has the following beneficial effects or advantages: 1) This application performs rough cleaning and fine cleaning on the titanium alloy structural component 100, and then performs deep cleaning on the threaded blind holes 130 of the titanium alloy structural component 100 one by one. After cleaning, the surface, weld, threaded blind holes 130 and / or pin holes 140 of the titanium alloy structural component 100 are finely cleaned again by using saturated steam equipment. This can ensure that the high precision surface of the titanium alloy structural component 100 and the precision of the threaded holes are controlled. The methods of wiping with cleaning agent, ultrasonic cleaning and saturated steam cleaning ensure that oil stains, oxides and other excess substances are removed cleanly, and the requirements of clean pretreatment are met.

[0048] 2) This application can guarantee the dimensional accuracy of high-precision assembly surfaces and high-precision threaded blind holes, and solve the problem that the cleanliness of semi-enclosed cavities, welds, blind holes and structural parts surfaces cannot be guaranteed.

[0049] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0051] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0052] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0053] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A pretreatment method for titanium alloy structural parts before pickling, characterized in that, The titanium alloy structural component includes a base plate and several wall plates connected to the base plate. The base plate and the wall plates are provided with several threaded blind holes, several pin holes and several mounting bosses. The pretreatment method for titanium alloy structural parts before pickling includes the following steps: Wipe the surface of the titanium alloy structural component with a metal cleaning solution; The wiped titanium alloy structural component is placed in an ultrasonic cleaning tank containing ultrasonic cleaning solution for cleaning. Inject alcohol into the threaded blind hole of the cleaned titanium alloy structural component until the alcohol level is higher than or equal to 3 / 4 of the hole depth. The drill bit of the drill bit cleaning equipment is inserted into the threaded blind hole and the threaded blind hole is cleaned; The surface, welds, threaded blind holes, and / or pin holes of the titanium alloy structural component are cleaned using a saturated steam device until the titanium alloy structural component is completely cleaned.

2. The pretreatment method for titanium alloy structural parts before pickling according to claim 1, characterized in that, The metal cleaning agent solution is prepared by dissolving the metal cleaning agent in water at 40℃~60℃ to prepare a metal cleaning agent solution of 1 g / L~5 g / L.

3. The pretreatment method for titanium alloy structural parts before pickling according to claim 1, characterized in that, The ultrasonic cleaning solution comprises the following components at concentrations of: 40 g / L to 50 g / L trisodium phosphate, 20 g / L to 30 g / L sodium carbonate, and 15 g / L to 25 g / L sodium silicate.

4. The pretreatment method for titanium alloy structural parts before pickling according to claim 3, characterized in that, The ultrasonic cleaning tank has a cleaning temperature of 5℃ to 40℃ and a cleaning time of 10 min to 20 min.

5. The pretreatment method for titanium alloy structural parts before pickling according to claim 4, characterized in that, The ultrasonic cleaning tank has several ultrasonic transducers on its walls and / or bottom, and the distance between the titanium alloy structural component and the ultrasonic transducers is greater than or equal to 100 mm.

6. The pretreatment method for titanium alloy structural parts before pickling according to any one of claims 1-5, characterized in that, Injecting alcohol into the threaded blind hole of the cleaned titanium alloy structural component specifically includes the following steps: Inject 75% alcohol into the threaded blind holes of the cleaned titanium alloy structural component using a syringe, and soak for 10 to 20 minutes.

7. The pretreatment method for titanium alloy structural parts before pickling according to claim 6, characterized in that, The drill bit of the drill bit cleaning equipment is made of silicon carbide; The drill bit of the drill bit cleaning device is smaller than the size of the corresponding threaded blind hole, so that the drill bit of the drill bit cleaning device extends into the bottom of the corresponding threaded blind hole.

8. The pretreatment method for titanium alloy structural parts before pickling according to any one of claims 1-5, characterized in that, The saturated steam equipment is equipped with a blind hole cleaning head and a flat cleaning head; When the saturated steam equipment includes a blind hole cleaning head, the saturated steam equipment cleans the threaded blind hole, and the blind hole cleaning head of the saturated steam equipment extends into the threaded blind hole to a depth of 1 / 3 to 1 / 2, and the cleaning time for each threaded blind hole is greater than or equal to 30 seconds; When the saturated steam equipment includes a flat cleaning head, the saturated steam equipment cleans the surface, weld and / or pin hole of the titanium alloy structural component; the distance between the flat cleaning head of the saturated steam equipment and the surface, weld and / or pin hole of the titanium alloy structural component is 50mm to 150mm, and the moving speed of the saturated steam equipment is 10cm / s to 20cm / s.

9. The pretreatment method for titanium alloy structural parts before pickling according to any one of claims 1-5, characterized in that, The pretreatment method for titanium alloy structural components before pickling further includes the following steps after the titanium alloy structural components are completely cleaned: The threaded blind hole is protected by a first protective component; The pin hole is protected by a second protective component; The mounting boss is protected by a third protective component.

10. The pretreatment method for titanium alloy structural parts before pickling according to claim 9, characterized in that, The first protective component is a titanium alloy screw; The specific method of protecting the threaded blind hole with the first protective component is as follows: the titanium alloy screw is wrapped with polytetrafluoroethylene tape for 3 to 5 turns, and then screwed into the corresponding threaded blind hole. The second protective component is a rubber rope; The pin hole is protected by the second protective component by wrapping the rubber rope with polytetrafluoroethylene tape 3 to 5 times and then inserting it into the corresponding pin hole. The third protective component is a protective adhesive; The specific method of protecting the mounting boss with a third protective component is as follows: apply two or more layers of protective adhesive to the surface of the mounting boss, with each layer of protective adhesive having a thickness of 0.5mm to 1.0mm and an interval of 6h to 12h between layers.

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