Underwater corrosion potential detection device

Abstract

The invention relates to the field of underwater corrosion detection, in particular to an underwater corrosion potential detection device, which comprises a gun head part, a gun body part, a circuit board, a detection unit, a display screen and a button, wherein the gun head part is internally provided with a detection unit, and the detection unit is connected with the circuit board and used for sending measured potential data to the circuit board; the head end of the gun head part serves as a detection main body, and the tail end is fixedly connected with the gun body part through a stainless steel bolt; a circuit board is arranged in the gun body part, and a rear cover plate is arranged on the other end face, connected with the gun head part, of the gun body part. A display screen and a watertight button are embedded in the rear cover plate; the display screen and the button are respectively connected with the circuit board; the button is used for starting the detection unit; meanwhile, the display screen displays the received real-time measurement data sent by the circuit board. The method can be used for detecting or monitoring the corrosion condition of the underwater steel structure for a long time. And potential reading and recording are convenient, accurate and rapid. And important data support is provided for the engineering field.

Description

Technical Field

[0001] The invention relates to the field of underwater corrosion detection, and in particular to an underwater corrosion potential detection device. Background Art

[0002] Major marine infrastructure and engineering equipment built for the development of marine resources are mostly made of steel structures and concrete materials. The corrosion problem of underwater steel structures is a major challenge faced by fields such as offshore platforms, shipbuilding and submarine pipelines. In order to better understand the current corrosion status of underwater steel structures, reduce harm to personnel and the environment, and extend the service life of equipment, regular inspections or long-term monitoring of underwater steel structures are very necessary. Common anti-corrosion measures for underwater steel structures include cathodic protection and coating protection. Sacrificial anode and impressed current cathodic protection methods are widely used in offshore steel structures. In order to ensure that the steel structure is fully protected, the cathodic protection potential needs to be maintained within a certain range. When the actual potential is higher than the protection potential, the steel structure is in an under-protected state; when the actual potential is lower than the protection potential, the steel structure is in an over-protected state.

[0003] At present, there are two main ways to detect underwater potential. The first is for divers or underwater robots (ROVs) to carry portable potential devices for underwater detection. The second method is to place the measuring electrode close to the underwater steel structure, and the potential signal data is transmitted to the surface through cables or ROV umbilical cords. The control personnel on the surface use voltage instruments to read the voltage data.

[0004] The advantage of portable corrosion detection devices is that divers or ROVs can accurately place the detection equipment at the detection point of the steel structure to ensure the accuracy and stability of the measurement position. This is particularly important in complex underwater environments, where automated equipment may find it difficult to achieve precise positioning. Divers can perform multi-point measurements at different structural parts and observe the physical state of the structure (such as corrosion, damage, etc.) with the naked eye, thereby providing more comprehensive evaluation information. In addition, divers can directly read and record measurement data underwater, reducing delays and errors in data transmission, thereby improving detection efficiency. At present, the potential acquisition devices on the market all use a single electrode as an underwater measurement electrode in seawater, which may affect the precision and accuracy of data measurement in complex underwater environments. In addition, the data processing and storage functions of these devices are relatively weak, limiting their application in complex data analysis and long-term monitoring. On the other hand, for projects or individual users with limited budgets, the high cost of equipment use is also an important factor to consider. Summary of the invention

[0005] In view of the above problems, the purpose of the present invention is to provide a portable underwater corrosion potential detection instrument. Through experiments and tests, it is proved that the device has good stability and accuracy in seawater environment and can effectively monitor the corrosion condition of underwater steel structures. This study optimizes some shortcomings of underwater corrosion potential detection instruments on the market and provides a feasible solution.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] An underwater corrosion potential detection device comprises: a gun head part, a gun body part, a circuit board, a detection unit, a display screen and a button;

[0008] Wherein, a detection unit is provided in the gun head part, and the detection unit is connected to the circuit board and is used to send the measured potential data to the circuit board;

[0009] The head end of the gun head part serves as the detection body, and the tail end thereof is fixedly connected to the gun body part by a stainless steel bolt;

[0010] The gun body is provided with a circuit board, and a rear cover is provided on the other end surface of the gun body that is connected to the gun head; a display screen and a watertight button are embedded on the rear cover;

[0011] The display screen and the button are connected to the circuit board respectively, wherein the button is used to start the detection unit; meanwhile, the display screen displays the real-time measurement data received from the circuit board.

[0012] The gun head is divided into a conical hollow shell structure to avoid errors caused by the distance between the two reference electrodes of the detection unit being too far;

[0013] The conical end of the gun head is provided with a through hole, and the bottom surface is provided with a connecting plate for sealing and sealed through a flange to prevent seawater from entering the gun body;

[0014] The surface of the gun head part is provided with two circular holes, which facilitate the rapid discharge of seawater when the gun head part is immersed in the water surface, thereby forming a loop for the detection unit.

[0015] A flange is fixedly provided on the rear end surface of the gun head part, and the flange is fixedly connected to the bottom plate of the gun body part 2;

[0016] A gasket is arranged between the flange and the bottom plate of the gun body part, so as to prevent external liquid from flowing in when the gasket is deformed under the action of the stainless steel bolt used for connecting the gun head part and the gun body part.

[0017] The detection unit comprises: a reference electrode A, a reference electrode B and a probe;

[0018] The reference electrode A and the reference electrode B are both arranged in the gun head part; the probe is inserted into the head of the gun head part, and the main body of the probe is exposed outside the gun head part;

[0019] The tail of the probe is connected to the input end of the reference electrode A and the reference electrode B respectively;

[0020] The reference electrode A output end, the reference electrode B output end and the tail of the probe are respectively connected with wires to the circuit board of the gun body.

[0021] The reference electrode A is a solid silver / silver chloride reference electrode;

[0022] The reference electrode B is a solid high-purity zinc reference electrode;

[0023] The probe is an underwater steel structure.

[0024] The metal substrates of the reference electrode A and the reference electrode B retain only one working surface, and the remaining surfaces are sealed by an annular resin to prevent the electrode performance from degrading too quickly and to avoid interference between the two electrodes.

[0025] The circuit board includes: a microcontroller and a dual voltage measurement channel, a USB serial port, a display screen interface and a charging port connected thereto;

[0026] The circuit board is used to collect potential data measured by the detection unit through the dual voltage measurement channel, and connect the potential data to the display screen through the display screen interface to display real-time measurement data, and store it in a memory card at the same time, so as to facilitate data storage and reading;

[0027] The circuit board is connected to an external terminal via a USB serial port to convert USB to TTL to modify the current time of the system and the frequency of measurement;

[0028] A lithium battery is provided on the circuit board for power supply, and is connected to the circuit board via the charging port 13 to achieve power replenishment.

[0029] A clock chip is also provided on the circuit board;

[0030] The clock chip is connected to a button battery and is powered by the button battery alone to ensure normal operation when the circuit board 3 is turned off.

[0031] The display screen displays real-time measurement data, including: real-time voltage data of two channels CH1 and CH2 of the reference electrode, storage status of data stored in the memory card, current time of the device, and current measurement frequency of the device.

[0032] Also includes a handle disposed on the outer wall of the gun body portion;

[0033] The gun head part, the gun body part, and the bottom plate and rear cover plate arranged thereon are all acrylic shells.

[0034] The advantages and beneficial effects of the present invention are as follows: This study aims to develop a portable underwater corrosion potential detection device for monitoring the corrosion of underwater steel structures. The principle and structure are simple, and personalized shell customization can be achieved. The present invention exhibits good stability and accuracy in seawater environments, and can effectively detect and record corrosion data of steel structures. Through long-term monitoring and recording of corrosion potential, the device can provide important data support for the engineering field, help extend the service life of equipment, reduce maintenance costs, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of the underwater corrosion potential detection device of the present invention;

[0036] Figure 2 A schematic diagram of the structure of a data acquisition and storage circuit board customized for the present invention;

[0037] Figure 3 This is a schematic diagram of the display content of the display screen of the present invention;

[0038] Among them, 1 is the gun head part, 2 is the gun body part, 3 is the circuit board, 4 is the reference electrode A, 5 is the reference electrode B, 6 is the probe, 7 is the display screen, 8 is the watertight button, 9 is the USB serial port, 10 is the dual voltage measurement channel, 11 is the microcontroller, 12 is the display screen interface, 13 is the charging port, 14 is the voltage data display measured by the dual channels, 15 is the current test year, month, day time, 16 is the data storage result status, and 17 is the current measurement frequency;

[0039] Figure 4 (a) is an electrode potential diagram of the solid silver / silver chloride reference electrode of the present invention relative to a saturated calomel electrode in a sodium chloride solution with a mass fraction of 3.5 wt %;

[0040] Figure 4 (b) is an electrode potential diagram of the solid high-purity zinc reference electrode of the present invention relative to a saturated calomel electrode in a sodium chloride solution with a mass fraction of 3.5 wt %;

[0041] Figure 5 (a) is the open circuit potential of 304 stainless steel in a natural corrosion state with a sampling frequency of 1 second in the present invention;

[0042] Figure 5 (b) is an open circuit potential diagram of naturally corroded 304 stainless steel with a sampling frequency of 1 hour in the present invention;

[0043] Figure 5(c) is an open circuit potential diagram of naturally corroded Q235 carbon steel with a sampling frequency of 1 second in the present invention;

[0044] Figure 5 (d) is an open circuit potential diagram of naturally corroded Q235 carbon steel with a collection frequency of 1 hour in the present invention;

[0045] Figure 6 (a) is a protective potential diagram of 304 stainless steel under cathodic protection with a sampling frequency of 1 hour in the present invention;

[0046] Figure 6 (b) is a protective potential diagram of Q235 carbon steel under cathodic protection with a collection frequency of 1 hour according to the present invention;

[0047] Figure 6 (c) is an open circuit potential diagram of naturally corroded Q235 carbon steel collected at a frequency of 1 hour at 30°C according to the present invention;

[0048] Figure 6 (d) is an open circuit potential diagram of naturally corroded Q235 carbon steel collected at 50° C. with a sampling frequency of 1 hour according to the present invention;

[0049] Figure 6 (e) is an open circuit potential diagram of naturally corroded Q235 carbon steel collected at 70° C. with a sampling frequency of 1 hour in the present invention;

[0050] Figure 6 (f) is an open circuit potential diagram of the natural corrosion of Q235 carbon steel tested at -5°C-100°C by the present invention;

[0051] Figure 7 (a) is a photo of the device of the present invention after it is fully assembled and sealed;

[0052] Figure 7 (b) is a photo of the scene of underwater testing of the present invention;

[0053] Figure 8 Photos of the scene for underwater testing of the present invention;

[0054] Fig. 9 This is a working scene diagram of the present invention for testing metal underwater. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] like Figure 1As shown, the present invention provides an underwater corrosion potential detection device, comprising a gun head part 1 containing an electrode and a gun body part 2 with a watertight design; the gun head part contains two reference electrodes 4, 5 and a probe 6 connected to an underwater steel structure; the gun body part has a customized circuit board 3 inside; the two parts are connected and sealed by a flange connection;

[0057] An underwater corrosion potential detection device, characterized in that it comprises: a gun head part 1, a gun body part 2, a circuit board 3, a detection unit, a display screen 7 and a button 8;

[0058] Among them, a detection unit is provided in the gun head part 1, and the detection unit is connected to the circuit board 3, and is used to send the measured potential data to the circuit board;

[0059] The head end of the gun head part 1 serves as the detection body, and the tail end thereof is fastened to the gun body part 2 by using 8 stainless steel bolts.

[0060] A circuit board 3 is provided in the gun body part 2, and a rear cover plate is provided on the other end surface where the gun body part 2 and the gun head part 1 are connected to each other; a display screen 7 and a watertight button 8 are embedded on the rear cover plate;

[0061] The display screen 7 and the button 8 are respectively connected to the circuit board 3 , wherein the button 8 is used to start the detection unit; meanwhile, the display screen 7 displays the real-time measurement data received from the circuit board 3 .

[0062] The underwater corrosion potential detection device of the present invention further includes a handle arranged on the outer wall of the gun body part 2;

[0063] The gun head part 1, the gun body part 2, and the bottom plate and rear cover plate arranged thereon are all acrylic shells.

[0064] like Figure 1 As shown, the gun head part 1 is conical in design, which makes the overall shape of the device more compact and avoids the distance between the two reference electrodes being too far, which may cause errors. There are two circles of circular holes on the surface of the gun head, which facilitate the rapid inflow or discharge of seawater when the device is submerged in water, so that the underwater measured steel structure and the reference electrode form a loop, and the seawater can also be discharged when leaving the water, achieving the effect of weight reduction.

[0065] The conical end of the gun head part 1 is provided with a through hole, and the bottom surface is provided with a connecting plate for sealing and sealed by a flange to prevent seawater from entering the gun body part 2;

[0066] The surface of the gun head part 1 is provided with two circular holes, which facilitate the rapid discharge of seawater when the gun head part is immersed in the water surface, thereby forming a loop for the detection unit.

[0067] A flange is fixedly provided on the rear end surface of the gun head part 1, and the flange is fixedly connected to the bottom plate of the gun body part 2;

[0068] A gasket is provided between the flange and the bottom plate of the gun body part 2 to prevent external liquid from flowing in when the gasket is deformed under the force of the stainless steel bolts used to connect the gun head part 1 and the gun body part 2.

[0069] The detection unit includes: a reference electrode A4, a reference electrode B5 and a probe 6. Since the working environment of the device is in seawater, solid electrodes can be used directly, and seawater is used as the electrolyte.

[0070] The reference electrode A4 and the reference electrode 5 are both arranged in the gun head part 1; the probe 6 is inserted into the head of the gun head part 1, and the main body of the probe 6 is exposed outside the gun head part 1;

[0071] The tail of the probe 6 is connected to the input end of the reference electrode A4 and the reference electrode B5 respectively;

[0072] The output end of the reference electrode A4, the output end of the reference electrode B5 and the tail of the probe 6 are respectively connected to the circuit board 3 of the gun body 2 with wires.

[0073] Reference electrode A4 is a silver / silver chloride electrode, and reference electrode B5 is a high-purity zinc electrode, which are directly described below;

[0074] The silver / silver chloride electrode 4 is prepared by a powder tableting method and has high potential stability and good reversibility. The high-purity zinc electrode 5 is prepared by high-purity zinc with a purity of ≥99.999%, has stable performance and low manufacturing cost, and is widely used in marine environments. Two different types of reference electrodes are set to achieve the functions of mutual calibration and standby detection. By comparing the data of the two reference electrodes, it is determined whether the measurement data has errors, thereby preventing the inaccurate results caused by a single reference electrode, thereby improving the accuracy of the detection results.

[0075] Only one working surface is retained on the metal substrate of the two reference electrodes, and the remaining surfaces are sealed with epoxy resin to prevent the electrode performance from degrading too quickly and to avoid interference between the two electrodes.

[0076] In the present invention, the gun body part 2 has electronic devices inside, so it must be designed to be watertight to ensure normal operation underwater. The reference electrodes 4, 5 and the probe 6 are connected to a watertight plug at the front end of the gun body part through wires to ensure that seawater does not flow into the inside. At the rear end of the gun body part 2, there is a bottom plate connected to the rear end flange. The difference from the flange connection between the gun head and the gun body is that the flange connection at the rear end adds a gasket between the gun body part 2 and the bottom plate. Under the action of the bolt, the gasket is deformed to prevent external liquid from flowing in.

[0077] like Figure 2 As shown, in the embodiment of the present invention, in order to collect and store data, a circuit board 3 is customized; the circuit board 3 collects the potential data measured by the gun head part through the dual voltage measurement channel 10, and can connect the data to the display screen 7 through the interface 12 to display the real-time measurement data, and store it in a Micro SD memory card, which is convenient for data storage and reading. The circuit board 3 supports connecting to a computer via a USB to TTL serial port 9 to modify the current time of the system and the frequency of measurement. The circuit board 3 is manufactured based on the STM32F103C8T6 series of single-chip microcomputers. It has the advantages of high performance, low power consumption, and high integration, making it particularly suitable for applications that require complex logic processing. The circuit board 3 is powered by a 50mAh lithium battery and can be recharged through the charging port 13.

[0078] like Figure 3 As shown, in the embodiment of the present invention, a 1.3-inch OLED display screen is equipped, which can display test data in real time, improving the practicality and convenience of operation of the device. The display screen data includes the real-time voltage data of the two channels CH1 and CH2, the storage status of the data stored in the Micro SD memory card, the current time of the device, and the current measurement frequency of the device.

[0079] like Figure 4 (a) and Figure 4 As shown in (b), in the embodiment of the present invention, the role of the reference electrode is very critical in the process of potential collection. In the seawater cathodic protection system, the reference electrode is a comparison electrode for the potential of the protected metal in the seawater medium. When the error of the measured data is large, it may cause the structure to be under-protected or over-protected. Therefore, the stability of the reference electrode is very important. The polished electrode sample and the saturated calomel electrode are placed in a sodium chloride solution with a mass fraction of 3.5wt%, and the potential values ​​of the two electrodes are measured respectively using a HIOKI data recorder to record the potential data. After processing, a curve of potential change over time is obtained. The experimental results are shown in Figure 4 As shown, the potentials of the three solid silver / silver chloride reference electrodes are stabilized at 0.8mV, 1.2mV, and 4.9mV respectively. The potential drift of the whole process is between 1.2mV and 1.5mV. The potentials of the three solid high-purity zinc reference electrodes are stabilized at 1.034V, 1.040V, and 1.042V respectively. The potential drift is between 17mV and 27mV. The two reference electrodes meet the potential stability requirements of GB / T 7387-1999 and meet the requirements of measuring electrodes of corrosion potential detectors.

[0080] like Figure 5 (a)~ Figure 5As shown in (d), in an embodiment of the present invention, the corrosion process of metal in seawater is essentially an electrochemical reaction. According to the test results of the open circuit potential, a preliminary judgment can be made on the current state of metal corrosion. Q235 carbon steel and 304 stainless steel are common marine engineering metals. The feasibility of the present invention is tested by detecting the corrosion state of Q235 under different environmental parameters. The sample is placed in a prepared 3.5wt% sodium chloride solution, and the potential of the metal sample is measured using a silver / silver chloride electrode as a reference electrode. Set the recording intervals of different acquisition channels of the HIOKI data recorder to 1s and 1 hour. The customized data acquisition and storage circuit board 3 is also set. Figure 5 (a), 5(b) are the open circuit potential diagrams of 304 stainless steel at different acquisition frequencies after immersion for 69 hours. Figure 5 (c) and (d) are the open circuit potential diagrams of Q235 stainless steel at different acquisition frequencies after immersion for 7 hours. According to the formula error rate = |measured value - true value| / true value. The accuracy of the measurement data of the customized potential collector is calculated based on the test data of the HIOKI data recorder. Figure 5 (a)~ Figure 5 The error rates of (d) are 3.2%, 2.9%, 0.5% and 0.6% respectively.

[0081] like Figure 6 (a)~ Figure 6 As shown in (f), in an embodiment of the present invention, a cathodic protection system is formed by adding a zinc electrode as a sacrificial anode to the circuit of the Q235 carbon steel and 304 stainless steel metal samples, and the protection potential of the metal is tested to reflect the working status of the cathodic protection system. Testing the potential data of the two metals under cathodic protection can be used to evaluate the effectiveness of the cathodic protection system and provide sufficient information to optimize the settings in the cathodic protection system, such as adjusting the size of the protection current or the setting of the potential. This is very helpful for improving the energy efficiency and protection effect of the system. The potential data after applying protection to Q235 and 304 stainless steel is recorded by a HIOKI data recorder. The 304 stainless steel is protected for 23 hours and tested once every hour. The test image is as follows Figure 6 (a). The calculated error rate is 0.4%. Q235 carbon steel is protected for 44 hours, and the calculated error rate is 0.1%. Figure 6 (b) In order to explore the working environment at different temperatures, UCPD still needs to have high accuracy to complete the test work. Using a constant temperature magnetic stirrer to set three temperatures of 30°C, 50°C, and 70°C, compare the test data of the present invention and the HIOKI data recorder at these three temperatures, and calculate the error rate, such as Figure 6(c), (d), (e), the calculated error rates are 0.4%, 0.5%, and 0.2%, respectively. The seawater temperature in different sea areas varies greatly. In order to simulate the marine environment conditions, a constant temperature water tank and a constant temperature magnetic stirrer are used to set seven test temperatures of 100°C, 80°C, 60°C, 40°C, 20°C, 10°C, and -5°C. The Q235 carbon steel sample is immersed in a constant temperature sodium chloride solution with a mass fraction of 3.5wt%. The metal potential change data at 2h, 4h, and 6h of testing are collected using the present invention, as shown in FIG. Figure 6 (f). The invention is used for corrosion testing and must be able to work accurately and reliably under different environmental conditions. By performing corrosion tests at multiple temperature points, it can be verified whether the device can adapt to different test conditions and provide stable and consistent performance over the entire temperature range. The data obtained under multiple temperature conditions can improve the wide applicability of the test results, making the test results of the invention more valuable for reference and applicable to a wide range of practical application scenarios.

[0082] In an embodiment of the present invention, Figure 7 (a) is a diagram of the device of the present invention after assembly. Figure 7 (b) is the underwater test scene diagram.

[0083] like Figure 8 As shown, in the embodiment of the present invention, the present invention is tested for functions after being assembled underwater for multiple reasons. First, the underwater assembly test can ensure the waterproof performance of the present invention, verify the sealing, avoid water leakage, and protect the internal electronic components. Secondly, by testing in an underwater environment, the actual use environment can be simulated. The underwater assembly test can verify the effectiveness of all functions of the present invention in an underwater environment, ensure that all functions of the instrument can operate normally in actual use, and avoid the difference between laboratory conditions and the actual environment affecting the performance of the instrument.

[0084] The test was conducted in a 50cm×38cm×30cm water tank, which contained a 3.5wt% sodium chloride solution. The assembled and sealed whole of the present invention was completely immersed in the solution, taken out after immersion for 24 hours, the flange was disassembled, and no water droplets appeared inside the gun body. The watertightness of the present invention was verified.

[0085] like Fig. 9 As shown, in the embodiment of the present invention, a 304 stainless steel square tube of 2cm×2cm×25cm and 3mm wall thickness is placed in the water tank. Press the watertight switch to start the present invention, and put the probe in contact with the 304 stainless steel to read the potential value on the screen. The test can smoothly read the current open circuit potential of the 304 stainless steel metal.

[0086] The above description is only an embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. An underwater corrosion potential detection device, characterized in that: include: A gun head part (1), a gun body part (2), a circuit board (3), a detection unit, a display screen (7) and a button (8); Wherein, a detection unit is provided in the gun head part (1), and the detection unit is connected to the circuit board (3) and is used to send the measured potential data to the circuit board; The head end of the gun head part (1) serves as a detection body, and the tail end thereof is fixedly connected to the gun body part (2) by means of stainless steel bolts; A circuit board (3) is provided in the gun body part (2), and a rear cover is provided on the other end surface of the gun body part (2) and the gun head part (1) connected to each other; a display screen (7) and a watertight button (8) are embedded on the rear cover; The display screen (7) and the button (8) are respectively connected to the circuit board (3), wherein the button (8) is used to start the detection unit; at the same time, the display screen (7) displays the real-time measurement data received and sent by the circuit board (3).

2. An underwater corrosion potential detection device according to claim 1, characterized in that: The gun head part (1) is a conical hollow shell structure to avoid errors caused by the distance between the two reference electrodes of the detection unit being too far; The conical end of the gun head part (1) is provided with a through hole, and the bottom surface is provided with a connecting plate for sealing and sealed by a flange to prevent seawater from entering the gun body part (2); The surface of the gun head part (1) is provided with two circular holes, which facilitate the rapid discharge of seawater when the gun head part is immersed in the water surface, thereby forming a loop for the detection unit.

3. An underwater corrosion potential detection device according to claim 1, characterized in that: A flange is fixedly provided on the rear end surface of the gun head part (1), and the flange is fixedly connected to the bottom plate of the gun body part (2); a gasket is provided between the flange and the bottom plate of the gun body part (2), so as to prevent external liquid from flowing in when the gasket is deformed under the action of the stainless steel bolt used to connect the gun head part (1) and the gun body part (2).

4. The underwater corrosion potential detection device according to claim 1, characterized in that: The detection unit comprises: a reference electrode A (4), a reference electrode B (5) and a probe (6); The reference electrode A (4) and the reference electrode B (5) are both arranged in the gun head part (1); the probe (6) is inserted into the head of the gun head part (1), and the main body of the probe (6) is exposed outside the gun head part (1); The tail of the probe (6) is connected to the input end of the reference electrode A (4) and the reference electrode B (5). The output end of the reference electrode A (4), the output end of the reference electrode B (5) and the tail of the probe (6) are respectively connected with wires to the circuit board (3) of the gun body (2).

5. An underwater corrosion potential detection device according to claim 4, characterized in that: The reference electrode A (4) is a solid silver / silver chloride reference electrode; The reference electrode B (5) is a solid high-purity zinc reference electrode; The probe (6) is an underwater steel structure.

6. An underwater corrosion potential detection device according to claim 4, characterized in that: The metal substrates of the reference electrode A (4) and the reference electrode B (5) retain only one working surface, and the remaining surfaces are sealed by an annular resin to prevent the electrode performance from degrading too quickly and to avoid interference between the two electrodes.

7. The underwater corrosion potential detection device according to claim 1, characterized in that: The circuit board (3) comprises: a microcontroller (11) and a dual voltage measurement channel (10) connected thereto, a USB serial port (9), a display screen interface (12) and a charging port (13); The circuit board (3) is used to collect potential data measured by the detection unit through the dual voltage measurement channel (10), and connect the potential data to the display screen (7) through the display screen interface (12) to display real-time measurement data, and store the data in a memory card to facilitate data storage and reading; The circuit board (3) is connected to an external terminal via a USB serial port (9) to convert USB to TTL, thereby modifying the current time of the system and the frequency of measurement; A lithium battery is provided on the circuit board 3 for power supply and is connected to the circuit board via a charging port (13) to achieve power replenishment.

8. An underwater corrosion potential detection device according to claim 7, characterized in that: The circuit board (3) is also provided with a clock chip; The clock chip is connected to a button battery and is powered by the button battery alone to ensure that the clock chip can still operate normally when the circuit board (3) is turned off.

9. The underwater corrosion potential detection device according to claim 7, characterized in that: The display screen (7) displays real-time measurement data, including: real-time voltage data of two channels CH1 and CH2 of the reference electrode, storage status of data stored in the storage card, current time of the device, and current measurement frequency of the device.

10. The underwater corrosion potential detection device according to claim 1, characterized in that: Also includes a handle arranged on the outer wall of the gun body part (2); The gun head part (1), the gun body part (2), and the bottom plate and rear cover plate arranged thereon are all made of acrylic material.

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