Corrosion Resistance Testing Process and Testing Device for Bridge Bearing Fasteners

Abstract

This application relates to the field of bridge inspection, specifically disclosing a corrosion resistance testing process for bridge bearing fasteners, including the following steps: S1, preparing the test solution: mixing ammonium chloride, sodium chloride, and deionized water in a mass percentage ratio of 13.3%:5%:81.7%, stirring evenly to form a homogeneous solution; S2, controlling the test conditions: heating the test solution to 95±2℃ and maintaining it within this temperature range; S3, immersion and observation: immersing the sample to be tested in the constant-temperature test solution described in step S2, and observing and recording whether rust appears on the sample surface at 60 minutes, 120 minutes, and 180 minutes after immersion; the beneficial effect of this application is that it provides a corrosion resistance testing process for bridge bearing fasteners that improves testing efficiency.

Description

Technical Field

[0001] This application relates to the field of bridge inspection, and in particular to a device for testing the corrosion resistance of bridge bearing fasteners. Background Technology

[0002] Bridge bearing fasteners (such as bolts, nuts, washers, etc.) are key components that ensure reliable connection between the bearings and the beams and piers. Their corrosion resistance directly affects the safety and durability of the bridge structure. Corrosion resistance testing of bridge bearing fasteners is a crucial step in ensuring the safe, durable, and economical operation of the bridge structure, and its significance is profound.

[0003] Dacromet coatings are widely used on fasteners for bridge bearings due to their excellent corrosion resistance. Currently, salt spray testing is used to inspect Dacromet coatings. However, due to the long salt spray test cycle (1000h), the salt spray test method is difficult to use for on-site control during the Dacromet production process.

[0004] Therefore, it is necessary to design a testing process that can improve the efficiency of Dacromet coating corrosion resistance testing. Summary of the Invention

[0005] This application provides a corrosion resistance testing device for bridge bearing fasteners, which solves the problem of slow testing speed in the prior art and improves the efficiency of corrosion resistance testing for bridge bearing fasteners.

[0006] The corrosion resistance testing process for bridge bearing fasteners provided in this application adopts the following technical solution: including:

[0007] S1. Preparation of test solution: Mix ammonium chloride, sodium chloride and deionized water in a mass percentage of 13.3%:5%:81.7%, stir well to form a homogeneous solution;

[0008] S2. Control test conditions: Heat the test solution to 95±2℃ and maintain it within this temperature range;

[0009] S3. Immersion and Observation: Immerse the sample to be tested in the constant temperature test solution described in step S2. Observe and record whether rust appears on the sample surface at 60 minutes, 120 minutes and 180 minutes after immersion.

[0010] This method perfectly combines the properties of ammonium nitrate solution: it not only possesses the oxidizing properties of ammonium nitrate but also the weak acidity (pH 5.5-6.0) of its 20% aqueous solution. Furthermore, the raw materials used in the method are readily available, highly safe, easy to control and store, and can be used on-site to test the corrosion resistance of Dacromet coatings at any time. It is convenient, fast, highly practical, and environmentally friendly.

[0011] Optionally, in step S1, the pH of the prepared test solution before heating is 4-6.

[0012] Optionally, in step S2, the heating process to 95±2℃ utilizes the chemical property that the ionization degree of ammonium salts and chloride salts in the test solution increases with increasing temperature, leading to enhanced acidity of the solution, thus forming a stable accelerated corrosion environment under the constant temperature conditions.

[0013] A bridge bearing fastener corrosion resistance testing device, applicable to the aforementioned bridge bearing fastener corrosion resistance testing process, including:

[0014] The tank body has an internal space that sequentially forms a stirring chamber, an impregnation chamber, and a recovery chamber along a first direction;

[0015] The stirring module is located inside the stirring chamber;

[0016] A loading platform is provided inside the immersion chamber to load the test piece;

[0017] A pH sensor detects the pH value of the test solution and outputs a first detection signal.

[0018] The signal processing module is connected to the pH detection sensor signal, receives the first detection signal, selects the working mode according to the first detection signal, or converts the first detection signal into a corresponding input command based on the current working mode;

[0019] The adjustment module, in response to the signal processing module, executes the output command;

[0020] The tank body includes a tank wall and a cavity defined by the tank wall. Two partitions are provided in the cavity along the first direction. One-way valves are provided on the partitions to connect the stirring chamber, the impregnation chamber, and the recovery chamber. The pH detection sensor is disposed in the stirring chamber and / or the impregnation chamber and is connected to the signal processing. The output commands include: preset target output pH value, data viewing, data storage, locking or blocking the first detection signal.

[0021] Optionally, a display screen is also installed on the tank;

[0022] The display screen has an operation panel; the operation panel also includes a button module, the button module including at least one button disposed on the operation panel and connected to the signal processing module, for outputting a first signal in response to the operator's pressing operation;

[0023] The signal processing module receives and responds to the second signal, selects an operating mode, or converts the second detection signal into a corresponding input command based on the current operating mode.

[0024] Optionally, the stirring module includes:

[0025] The stirring shaft has multiple movable stirring blades.

[0026] Loading component, used to load the mixing blades;

[0027] Adjustment mechanism, used to adjust the stirring angle of the stirring blades;

[0028] The loading component is slidably mounted on the stirring shaft along the first direction; the adjustment mechanism is connected to the signal processing module and responds to the output command issued by the signal processing module to execute the output command.

[0029] Optionally, the adjustment mechanism includes:

[0030] A rotating shaft is rotatably mounted on the side of the loading component to connect to the stirring blades;

[0031] The connecting rod is rotatably mounted on one side of the stirring blade located on the rotating shaft;

[0032] The lifting block is slidably mounted on the loading component along the first direction;

[0033] The first electromagnet responds to the signal processing module to perform power off / power on;

[0034] The connecting rod is rotatably connected to the lifting block at the end away from the stirring blade; a permanent magnet is set on the lifting block opposite to the electromagnet. When the first electromagnet is energized, it can generate a magnetic field that repels / attracts the permanent magnet to drive the lifting block to slide on the loading component.

[0035] Optionally, the loading component is movably connected to the rotating shaft along the first direction;

[0036] A magnetically conductive metal block is installed on the loading component;

[0037] A second electromagnet is positioned relative to the rotating shaft and the metal block;

[0038] The second electromagnet is connected to the signal processor and responds to the output command to execute the output command; the second electromagnet can generate a magnetic field that attracts the metal block after being energized; a ceramic sleeve is set between the metal block and the first electromagnet.

[0039] Optionally, cooling fins may be installed on the inner wall of the tank;

[0040] The cooling chip is connected to the signal processing module and responds to the first signal to execute the output command.

[0041] Optionally, several connecting pipes connecting to the stirring chamber are provided at the end of the tank;

[0042] The connecting pipe connects to an external storage box for storing ammonium chloride, sodium chloride, and deionized water;

[0043] A flow sensor is installed on the connecting pipe to monitor the dosage;

[0044] A solenoid valve is also installed on the connecting pipe.

[0045] In summary, this application includes at least one of the following beneficial technical effects:

[0046] 1. Improved detection efficiency and accuracy: According to the specific solution ratio and heating temperature described in claim 1, this process utilizes the characteristic that the degree of ionization of ammonium salts and chloride salts increases with increasing temperature, which can form a stable accelerated corrosion environment. Thus, while ensuring the stability of the test environment, the corrosion detection cycle is effectively shortened, and the accuracy and repeatability of the detection results are improved.

[0047] 2. Achieve automated and precise proportioning and control: The device can automatically monitor and control the injection dosage of ammonium chloride, sodium chloride and deionized water, realizing the automation and precision of test solution preparation, avoiding manual proportioning errors and ensuring the consistency of test solution components;

[0048] 3. Real-time monitoring and intelligent adjustment of the testing process: The device can monitor and adjust the solution environment in real time during the testing process to ensure that the testing environment is always within the preset compliance range;

[0049] 4. Improved stirring efficiency and flexibility: The structural design, which uses an electromagnet to drive the lifting block to change the angle of the stirring blades, allows the device to flexibly adjust the angle of the stirring blades according to the instructions of the signal processing module. This adapts to the stirring intensity requirements at different stages, effectively improving stirring efficiency and ensuring the uniformity of solution mixing. In other words, it provides more time for reagent preparation and enhances the stability of the test solution, thereby improving the efficiency of testing the test items. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the overall structure of the detection device according to an embodiment of this application;

[0051] Figure 2 This is a cross-sectional view of the overall structure of the detection device according to an embodiment of this application;

[0052] Figure 3 This is a schematic diagram of the overall structure of the stirring module according to an embodiment of this application;

[0053] Figure 4 This is a schematic diagram of the installation of the stirring blades according to an embodiment of this application;

[0054] Figure 5 This is a schematic diagram of the overall structure of the adjustment mechanism according to an embodiment of this application;

[0055] Figure 6 This is a schematic diagram of the tilt angle in an embodiment of this application;

[0056] Figure 7 This is a schematic diagram of the structure of the second electromagnet and metal block according to an embodiment of this application.

[0057] Reference numerals: 100, detection device; L, first direction; N, first rotation direction; α, tilt angle;

[0058] 1. Tank body; 12. Baffle plate; 13. Agitator chamber; 14. Impregnation chamber; 15. Recovery chamber; 16. Check valve;

[0059] 2. Stirring module; 21. Stirring shaft; 22. Loading component; 23. Adjustment mechanism; 231. Rotating shaft; 232. Connecting rod; 233. Lifting block; 234. First electromagnet; 235. First rotating hole; 236. Slot; 24. Motor; 25. Stirring blade; 26. Permanent magnet;

[0060] 3. Loading platform;

[0061] 5. Metal block; 51. Second electromagnet;

[0062] 6. Connecting pipe; 61. Solenoid valve. Detailed Implementation

[0063] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0064] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0065] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0066] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0067] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0068] Example 1

[0069] This application discloses a corrosion resistance testing process for bridge bearing fasteners, including the following steps:

[0070] S1. Preparation of the test solution: Accurately weigh the following components according to the mass percentage: 13.3% ammonium chloride, 5% sodium chloride, and the balance 81.7% deionized water; add the weighed ammonium chloride and sodium chloride sequentially to the container containing deionized water, start a magnetic stirrer or mechanical stirrer to stir, control the stirring speed at 200-400 rpm, and continue stirring for 15-20 minutes until the solid is completely dissolved, forming a homogeneous and transparent test solution; specifically, this solution with a specific ratio simulates the corrosive media in the marine atmospheric environment and de-icing salt environment where the bridge is located; sodium chloride, as a strong electrolyte, provides a large number of chloride ions, which have a small radius and strong penetrating ability, and easily destroy the passivation film on the metal surface; the introduction of ammonium chloride not only provides additional chloride ions, but more importantly, the ammonium ions have a complexing effect, which can accelerate the metal anodic dissolution process; the two work synergistically to form a powerful corrosion activation system.

[0071] S2. Controlling Test Conditions: Place the prepared homogenized solution in a constant temperature heating device (such as a constant temperature water bath or a magnetic stirrer with heating function). Turn on the heating function to heat the solution and strictly control the temperature within the range of 90±2℃ or 95±2℃. This ensures the intensity of molecular thermal motion while avoiding violent boiling that could lead to instability of the liquid film on the fastener surface or excessive evaporation and concentration of the solution. During the test, the solution temperature is monitored in real time by a temperature sensor to ensure that temperature fluctuations do not exceed the set error range. According to the principles of chemical kinetics, the corrosion reaction rate typically increases by 2-4 times for every 10℃ increase in temperature. The high-temperature environment greatly shortens the corrosion induction time, achieving the goal of "accelerated corrosion."

[0072] S3. Immersion and Observation: Select clean, oil-free bridge bearing fasteners as test samples. Completely immerse the sample in the constant-temperature test solution from step S2. Remove the sample at 60, 120, and 180 minutes after immersion (or observe it directly in a container with an observation window). Observe and record whether rust, bubbles, coating peeling, or discoloration appear on the sample surface with the naked eye or with the aid of a 5-10x magnifying glass.

[0073] At 60, 120, and 180 minutes after immersion, samples were observed directly through the observation window or briefly removed. The surface of the samples was then inspected and recorded with the naked eye or with a 5-10x magnifying glass to determine if rust, bubbles, coating peeling, or discoloration appeared. These phenomena were then semi-quantitatively scored (e.g., 0 points = no change, 1 point = slight rust, 2 points = significant rust, 3 points = severe rust). This yielded three discrete points on the corrosion degree over time. Based on these points, the accelerating or decelerating trend of the corrosion rate could be visually determined, thus evaluating the corrosion resistance of the fasteners.

[0074] More specifically, in step S1, the pH value of the prepared test solution needs to be measured using a precision pH meter before heating. The initial pH value of the test solution is adjusted to the range of 4-6 by adding a small amount of dilute hydrochloric acid or dilute sodium hydroxide solution, preferably pH 5. Controlling the pH value within the weakly acidic range (4-6) is because bridge bearing fasteners often encounter acid rain or acidic gas deposits in actual service environments. A weakly acidic environment can simulate the most severe acid rain corrosion conditions in actual working conditions; furthermore, the acidic environment increases the concentration of hydrogen ions, which act as depolarizers and undergo reduction reactions at the cathode, accelerating the cathodic process of electrochemical corrosion. This further improves the detection sensitivity and effectively eliminates defective products that might pass detection in a normal neutral environment but easily fail in an acidic environment. In step S1, the pH value of the prepared test solution before heating is 4-6.

[0075] More specifically, in step S2, the heating process to 95±2℃ utilizes the chemical property that the degree of ionization of ammonium and chloride salts in the test solution increases with increasing temperature, leading to increased acidity of the solution. Specifically, ammonium chloride, as a salt of a strong acid and a weak base, exists in a hydrolysis equilibrium in the solution. According to the principle of chemical equilibrium shift, the hydrolysis reaction is an endothermic process. As the temperature rises to around 95℃, the hydrolysis equilibrium shifts to the right, resulting in a significant increase in the concentration of hydrogen ions in the solution, which in turn naturally increases the acidity of the solution with increasing temperature.

[0076] Meanwhile, under high temperature conditions, the degree of ionization of sodium chloride and ammonium chloride increases, the migration rate of ions in the solution accelerates, and the conductivity increases, which reduces the circuit resistance of the corrosion cell and increases the corrosion current.

[0077] This process cleverly utilizes the endothermic property of ammonium chloride hydrolysis to construct a positive feedback corrosion environment of "temperature increase - acidity enhancement - corrosion acceleration." This environment is not simply a matter of high-temperature physical action, but rather a synergistic effect of chemical and physical factors. Under constant temperature conditions of 95±2℃, this accelerated environment exists in a relatively stable plateau phase, avoiding the loss of observational significance due to excessive acidity (such as direct use of strong acids) causing instantaneous and complete corrosion of the sample, while ensuring sufficient corrosion driving force. The stable accelerated corrosion environment formed through this mechanism ensures the reproducibility of test results and the comparability between different batches of fasteners, providing a scientific and reliable basis for the quality acceptance of bridge engineering projects.

[0078] Example 2

[0079] The bridge bearing fastener corrosion resistance testing device 100 is applicable to the above-mentioned bridge bearing fastener corrosion resistance testing process, and includes: a tank 1, a stirring module 2, a loading platform 3, a pH detection sensor, a signal processing module, and a dispensing module; wherein, the tank 1 serves as the main support and container of the testing device 100, and a cavity for containing the test solution is formed inside it; the tank 1 includes a tank wall and a cavity defined by the tank wall, and two partitions 12 are arranged in the cavity along the first direction L. These two partitions 12 divide the internal space of the tank 1 along the first direction L into three independent functional chambers: a stirring chamber 13, an impregnation chamber 14, and a recovery chamber 15. A one-way valve 16 is installed on each partition 12. Specifically, the partition 12 located between the stirring chamber 13 and the impregnation chamber 14 has a one-way valve 16 that directs from the stirring chamber 13 to the impregnation chamber 14, allowing the uniformly mixed test solution to flow unidirectionally into the impregnation chamber 14 and preventing backflow of the solution in the impregnation chamber 14 from contaminating the original solution in the stirring chamber 13. A one-way valve 16 is also installed on the partition 12 located between the impregnation chamber 14 and the recovery chamber 15, used to discharge the waste liquid after testing into the recovery chamber 15. This compartmentalized structure achieves process isolation for solution preparation, test impregnation, and waste liquid recovery, effectively avoiding cross-contamination and ensuring the accuracy of the test conditions.

[0080] Specifically, the stirring module 2 is disposed within the stirring chamber 13 to achieve stirring of the test solution; the loading platform 3 is disposed within the immersion chamber 14 for loading the test piece; a sealed door is provided on the side wall of the immersion chamber 14 for personnel to remove the loading platform 3. The loading platform 3 can be designed as a mesh structure or a bracket with clamping claws to ensure that the test piece is completely immersed in the test solution and is easy to pick up and put down;

[0081] A pH sensor is disposed within the stirring chamber 13 and / or the immersion chamber 14, and is connected to the signal processing module. In this embodiment, it is preferable to provide pH sensors in both the stirring chamber 13 and the immersion chamber 14, respectively, to monitor the pH value during solution preparation and pH changes during actual testing. The pH sensor is used to detect the pH value of the test solution in real time and output a first detection signal accordingly.

[0082] The signal processing module is connected to the pH detection sensor and has pre-set control logic and data processing programs. The signal processing module receives the first detection signal and selects a working mode according to the pre-set judgment logic; or, based on the current working mode, it converts the first detection signal into a corresponding input command. Output commands include, but are not limited to: preset target output pH value, data viewing, data storage, locking or blocking the first detection signal. The dispensing module is controlled and connected to the signal processing module, responding to the signal processing module to execute output commands. The dispensing module may include actuators such as a liquid pump and an acid / alkali reagent storage tank, used to inject acid or alkali solutions into the stirring chamber 13 or the impregnation chamber 14 to adjust the pH value.

[0083] Through the above-described scheme, the internal space of tank 1 is scientifically divided into a stirring chamber 13, an impregnation chamber 14, and a recovery chamber 15. Combined with the coordinated control of a pH detection sensor, a signal processing module, and a dispensing module, the entire process from solution preparation, pH adjustment, testing and monitoring to data management is automated and intelligent. This device not only significantly improves detection efficiency and the accuracy of test results but also enhances the reliability and safety of equipment operation through an intelligent instruction set (such as locking and shielding functions).

[0084] In this application, a display screen is also provided on the tank body 1; specifically, the operation panel also includes a button module, which includes at least one button disposed on the operation panel and connected to the signal processing module for outputting a first signal in response to the operator's pressing operation; the signal processing module receives and responds to the first signal, selects a working mode, or converts a second detection signal into a corresponding input command based on the current working mode; the output commands include, but are not limited to: preset target output pH value, data viewing, data storage, locking or blocking the second signal; through the above scheme, the operator can perform experimental operations through the operation panel, improving convenience.

[0085] In another more specific embodiment, the stirring module 2 includes: a stirring shaft 21, a loading component 22, and an adjusting mechanism 23; specifically, the stirring shaft 21 is vertically installed in the stirring chamber 13 along a first direction L; a motor 24 for driving the stirring shaft 21 to rotate is installed at the end of the tank 1; a plurality of stirring blades 25 are movably arranged on the stirring shaft 21, the number of stirring blades 25 is not an innovation of this application, and can therefore be freely set according to actual conditions; more specifically, a loading component 22 for loading the stirring blades 25 is slidably arranged on the stirring shaft 21 along the first direction L, the loading component 22 being integrally formed from a non-magnetic metal block 5; wherein, one end of the stirring blade 25 is rotatably connected to the loading component 22, so that the stirring blade 25 rotates along a first rotation direction N, the first rotation direction N being... Figure 6 The rotation direction is shown in the figure; the loading component 22 is provided with an adjustment mechanism 23 for adjusting the tilt angle α of the stirring blade 25; specifically, the adjustment mechanism 23 is signal-connected to the signal processing module and responds to the output command issued by the signal processing module to execute the output command; through the above scheme, different stirring and mixing effects can be achieved by autonomously changing the rotation angle of the stirring blade 25; by issuing a command through the signal processing module, the adjustment mechanism 23 responds to the action, realizing automatic adjustment without the need for manual shutdown for adjustment, thus improving detection efficiency;

[0086] Specifically, the adjustment mechanism 23 includes: a rotating shaft 231, a connecting rod 232, a lifting block 233, and a first electromagnet 234; wherein, the rotating shaft 231 is rotatably mounted on the side wall of the loading member 22 and is fixedly connected to the end of the stirring blade 25 near the loading member 22; thus, the stirring blade 25 can rotate around the rotating shaft 231 as the center of the rotating shaft 231; the stirring blade 25 is located on one side of the rotating shaft 231 and forms a first rotating hole 235 that is rotatably connected to the connecting rod 232; one end of the connecting rod 232 is inserted into the first rotating hole 235 to achieve a rotatable connection with the stirring blade 25; The lifting block 233 is slidably disposed on the loading member 22 along the first direction L, and the surface corresponding to the rotating shaft 231 forms a groove 236 along the first direction L; the lifting block 233 forms a second rotating hole at the position corresponding to the first rotating hole 235 on one side of the groove 236; the end of the connecting rod 232 away from the stirring blade 25 is inserted into the second rotating hole to achieve rotational engagement with the lifting block 233; through the above scheme, when the lifting block 233 moves along the first direction L, the connecting rod 232 can drive the stirring blade 25 to rotate, thereby changing the tilt angle α of the stirring blade 25;

[0087] More specifically, the first electromagnet 234 and the lifting block 233 are disposed opposite to each other on the loading component 22; a permanent magnet 26 is disposed opposite to the first electromagnet 234 on the lifting block 233; wherein, after being energized, the first electromagnet 234 can generate a magnetic field that repels / attracts the permanent magnet 26 to drive the lifting block 233 to slide on the loading component 22; specifically, the first electromagnet 234 is connected to the signal processing module and responds to the signal processing module to perform power-off or power-on or change the current to adjust the magnetism; by adopting the magnetic drive method of electromagnet and permanent magnet 26, non-contact transmission is realized inside the adjustment mechanism 23. Compared with the traditional gear or screw transmission, mechanical wear is reduced, the failure rate is reduced, and the response speed is fast, which can realize the rapid and precise adjustment of the angle. By controlling the direction and magnitude of the current of the first electromagnet 234, the moving distance and direction of the lifting block 233 can be precisely controlled, thereby realizing the stepless adjustment of the angle of the stirring blade 25;

[0088] In another, more specific embodiment, the loading component 22 is movably connected to the rotating shaft 231 along the first direction L, and a magnetically conductive metal block 5 is disposed on the loading component 22; a second electromagnet 51 is disposed opposite to the rotating shaft 231 and the metal block 5; wherein, the second electromagnet 51 is signal-connected to the signal processor and responds to the output command to execute the output command; after being energized, the second electromagnet 51 can generate a magnetic field that attracts the metal block 5; a ceramic sleeve is disposed between the metal block 5 and the first electromagnet 234; the function of the ceramic sleeve is to reduce the magnetic field interference between the metal block 5 and the first electromagnet 234, ensuring that the first electromagnet 234 only acts on the permanent magnet 26; through In the above scheme, during use, the signal processing module energizes the second electromagnet 51 to generate a magnetic field that attracts the metal block 5. Specifically, the surface of the stirring shaft 21 is recessed to form a moving groove, and the loading member 22 is protruded to form a bump, which is embedded in the moving groove so that the loading member 22 can move in the moving groove along the first direction L. A spring is provided between the bump and the bottom of the moving groove, and the spring provides an elastic force to the loading member 22 at the bottom of the stirring chamber 13. Therefore, the second electromagnet 51 can move the loading member 22. Through the above scheme, the entire set of stirring blades 25 can be driven to move up and down, improving mixing efficiency.

[0089] More specifically, the first electromagnet 234 and the second electromagnet 51 are encapsulated within a corrosion-resistant housing made of polytetrafluoroethylene (PTFE) or ceramic material. Only a magnetic transmission gap remains between the housing and the metal block 5, and a sealing ring is provided to prevent solution ingress. The ceramic sleeve further covers the outside of the electromagnet coil, forming multiple layers of protection.

[0090] In another, more specific embodiment, a cooling plate is provided on the inner wall of the tank 1; wherein the cooling plate is signal-connected to the signal processing module and responds to the first signal to execute the output command; the device enables the temperature of the stirring chamber 13 or the immersion chamber 14 to be adjusted; therefore, the detection temperature can be adjusted according to different detection items.

[0091] More specifically, the end of the tank 1 is provided with several connecting pipes 6 that connect to the stirring chamber 13. The connecting pipes 6 are connected to external storage boxes for storing ammonium chloride, sodium chloride, and deionized water. The reagents stored in the storage boxes can be replaced according to the different preparation processes of the test solution. A flow sensor is installed on the connecting pipe 6 to monitor the dosage. A solenoid valve 61 is also installed on the connecting pipe. Through the design of the above scheme, when preparing the test solution, the flow sensor can accurately detect the reagents flowing into the stirring chamber. The pH detection sensor in the stirring chamber detects the pH value in real time and transmits the information to the information processing module for analysis. Thus, the solenoid valve is controlled to input reagents according to the current pH value.

[0092] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0093] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A corrosion resistance testing process for bridge bearing fasteners, characterized in that, Includes the following steps: S1. Preparation of test solution: Mix ammonium chloride, sodium chloride and deionized water in a mass percentage of 13.3%:5%:81.7%, stir well to form a homogeneous solution; S2. Control test conditions: Heat the test solution to 95±2℃ and maintain it within this temperature range; S3. Immersion and Observation: Immerse the sample to be tested in the constant temperature test solution described in step S2. Observe and record whether rust appears on the sample surface at 60 minutes, 120 minutes and 180 minutes after immersion.

2. The corrosion resistance testing process for bridge bearing fasteners according to claim 1, characterized in that: In step S1, the pH value of the prepared test solution before heating is 4-6.

3. The corrosion resistance testing process for bridge bearing fasteners according to claim 1, characterized in that: In step S2, the heating process to 95±2℃ utilizes the chemical property that the ionization degree of ammonium salts and chloride salts in the test solution increases with increasing temperature, leading to increased acidity of the solution, thus forming a stable accelerated corrosion environment under the constant temperature conditions.

4. A corrosion resistance testing device for bridge bearing fasteners, characterized in that, The corrosion resistance testing process for bridge bearing fasteners as described in any one of claims 1-3 includes: The tank body has an internal space that sequentially forms a stirring chamber, an impregnation chamber, and a recovery chamber along a first direction; The stirring module is located inside the stirring chamber; A loading platform is provided inside the immersion chamber to load the test piece; A pH sensor detects the pH value of the test solution and outputs a first detection signal. The signal processing module is connected to the pH detection sensor signal, receives the first detection signal, selects the working mode according to the first detection signal, or converts the first detection signal into a corresponding input command based on the current working mode; The adjustment module, in response to the signal processing module, executes the output command; The tank body includes a tank wall and a cavity defined by the tank wall. Two partitions are provided in the cavity along the first direction. One-way valves are provided on the partitions to connect the stirring chamber, the impregnation chamber, and the recovery chamber. The pH detection sensor is disposed in the stirring chamber and / or the impregnation chamber and is connected to the signal processing. The output commands include: preset target output pH value, data viewing, data storage, locking or blocking the first detection signal.

5. The bridge bearing fastener corrosion resistance testing device according to claim 4, characterized in that: The tank is also equipped with a display screen; The display screen has an operation panel; the operation panel also includes a button module, the button module includes at least one button disposed on the operation panel and connected to the signal processing module, for outputting a first signal in response to the operator's pressing operation; The signal processing module receives and responds to the second signal, selects a working mode, or converts the second detection signal into a corresponding input command based on the current working mode.

6. The bridge bearing fastener corrosion resistance testing device according to claim 4, characterized in that: The stirring module includes: The stirring shaft has multiple movable stirring blades. Loading component for loading the stirring blades; Adjustment mechanism, used to adjust the stirring angle of the stirring blade; The loading component is slidably disposed on the stirring shaft along the first direction; the adjustment mechanism is signal-connected to the signal processing module and responds to the output command issued by the signal processing module to execute the output command.

7. The bridge bearing fastener corrosion resistance testing device according to claim 6, characterized in that: The adjustment mechanism includes: A rotating shaft is rotatably mounted on the side of the loading component to connect to the stirring blades; A connecting rod is rotatably mounted on one side of the stirring blade located on the rotating shaft; The lifting block is slidably disposed on the loading component along the first direction; The first electromagnet responds to the signal processing module to perform power off / power on; The connecting rod is rotatably connected to the lifting block at the end away from the stirring blade; a permanent magnet is provided on the lifting block opposite to the electromagnet, and the first electromagnet can generate a magnetic field that repels / attracts the permanent magnet after being energized, so as to drive the lifting block to slide on the loading component.

8. The bridge bearing fastener corrosion resistance testing device according to claim 6, characterized in that: The loading component is movably connected to the rotating shaft along the first direction; The loading component is provided with a magnetically conductive metal block; A second electromagnet is positioned relative to the metal block on the rotating shaft; The second electromagnet is connected to the signal processor and responds to the output command to execute the output command; the second electromagnet generates a magnetic field that attracts the metal block when energized; a ceramic sleeve is provided between the metal block and the first electromagnet.

9. The bridge bearing fastener corrosion resistance testing device according to claim 4, characterized in that: Cooling fins are installed on the inner wall of the tank. The cooling chip is connected to the signal processing module and responds to the first signal to execute the output command.

10. The bridge bearing fastener corrosion resistance testing device according to claim 4, characterized in that: Several connecting pipes communicating with the stirring chamber are provided at the end of the tank body; The connecting pipe connects to an external storage box for storing ammonium chloride, sodium chloride, and deionized water; A flow sensor is installed on the connecting pipe to monitor the dosage; A solenoid valve is also installed on the connecting pipe.

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