A marine underwater corrosion potential measuring device

Abstract

The application discloses a kind of marine underwater corrosion potential measuring devices, by being packaged in pressure-resistant shell inside main control module, real-time clock module and measurement module and other functional modules, obtain a compact structure with strong pressure resistance, small size, can be put into each underwater depth of marine environment by marine underwater corrosion potential measuring device, in-situ test of material corrosion is carried out;By setting measurement module, the corrosion potential data of high precision of corrosion test sample at each depth under water can be detected, and data support can be provided for studying the corrosion mechanism of different materials under deep-sea conditions;By setting real-time clock module, the corrosion potential data can be obtained by triggering main control module to call measurement module at a specific time point, so that the detected corrosion potential data can be aligned with other equipment measurement data, and the main control module can execute multiple different measurement modes, improve the flexibility of measurement.The application is widely used in the field of corrosion potential measurement technology.

Description

Technical Field

[0001] This invention relates to the field of corrosion potential measurement technology, and in particular to a marine underwater corrosion potential measurement device. Background Technology

[0002] The marine environment corrodes various materials, especially metals, damaging marine exploration and engineering equipment, affecting their normal operation, and even jeopardizing safety. Therefore, it is necessary to study the corrosion of materials in the marine environment.

[0003] Since corrosion in the marine environment is mainly caused by electrochemical reactions in materials, the degree of corrosion, corrosion rate, and corrosion resistance of materials can be studied by measuring the corrosion potential of materials in the underwater marine environment.

[0004] Corrosion experiments can be conducted on materials to measure their corrosion potential in the underwater marine environment. Currently, corrosion research on deep-sea materials mainly falls into two categories: natural field exposure and laboratory simulation. Real-sea testing more closely approximates the actual service conditions of materials, and its data is more valuable. In-situ testing helps reveal the kinetics of material corrosion on a time scale; therefore, in-situ corrosion potential measurements in the deep sea are essential. Due to the lack of deep-sea testing methods, current real-sea tests mostly employ the weightless plate method, followed by testing through subsequent recovery. This method cannot display or characterize the corrosion kinetics and aging state of materials in the deep sea in real time; the degree of corrosion can only be determined by sampling and analysis after the experiment. Moreover, seamless sample transfer during recovery is difficult, potentially causing unassessable impacts on the samples. Deep-sea natural environment testing systems are complex and costly. Besides the deployment, operation, and recovery of the testing equipment, its reliability is also related to various factors such as geology, environment, equipment, and human factors, leading to problems such as sample loss and low equipment recovery rates. Summary of the Invention

[0005] In view of the technical problems faced by current in-situ corrosion potential measurement technology in the ocean, such as high cost, difficulty in sample recovery process, and easy contamination of samples, the purpose of this invention is to provide an underwater corrosion potential measurement device for the ocean.

[0006] This invention includes an underwater corrosion potential measuring device for marine environments, comprising:

[0007] Real-time clock module; the real-time clock module is used for timing;

[0008] Measurement module; the measurement module is used to connect to the corrosion test sample;

[0009] The main control module is used to call the measurement module to measure the corrosion potential data of the corrosion test sample according to the timing of the real-time clock module.

[0010] Pressure-resistant housing; the real-time clock module, the measurement module and the main control module are encapsulated within the pressure-resistant housing.

[0011] Furthermore, the marine underwater corrosion potential measurement device also includes a battery module, a power module, and a potential probe; the battery module and the power module are used to supply power to the real-time clock module, the measurement module, and the main control module;

[0012] The pressure-resistant housing is coated with an anti-corrosion coating, and the pressure-resistant housing is provided with a first watertight interface and a second watertight interface;

[0013] The battery module and the main control module are connected to an external underwater detection device through the first watertight interface;

[0014] The potential probe is installed outside the pressure-resistant housing. The potential probe is connected to the measurement module through the second watertight interface. The potential probe is used to attach the corrosion test sample.

[0015] Furthermore, the potential probe is a three-electrode probe.

[0016] Furthermore, the marine underwater corrosion potential measuring device is used to mount external underwater detection equipment.

[0017] Furthermore, the external underwater detection equipment can be a CTD detector, a mooring buoy, a manned submersible, an autonomous underwater robot, a tethered remotely operated vehicle, or an underwater glider.

[0018] Further, the step of calling the measurement module to measure the corrosion potential data of the corrosion test sample based on the timing of the real-time clock module includes:

[0019] When selecting the continuous measurement mode, set the delay time before measurement starts, the measurement time interval, and the number of measurement data points;

[0020] Based on the timing of the real-time clock module, determine whether the delay time before the measurement starts has elapsed;

[0021] When the delay time before the start of the measurement has elapsed, the measurement time interval is determined based on the timing of the real-time clock module.

[0022] Each time the measurement time interval is elapsed, the measurement module is invoked to measure the corrosion test sample, obtaining a corresponding corrosion potential data point, and the number of measurements is recorded.

[0023] The measurement process stops when the cumulative number of measurements reaches the number of measurement data points.

[0024] Further, the step of calling the measurement module to measure the corrosion potential data of the corrosion test sample based on the timing of the real-time clock module includes:

[0025] When selecting the real-time measurement mode, at least one measurement time point must be set.

[0026] Based on the timing of the real-time clock module, determine whether the measurement time point has been reached;

[0027] When the measurement time point is reached, the measurement module is invoked to measure the corrosion test sample and obtain a corresponding corrosion potential data.

[0028] Furthermore, the main control module is also used to call the measurement module to output a reverse voltage before each measurement of the corrosion test sample is called, and the main control module is also used to perform filtering, fitting and calibration processing on each of the measured corrosion potential data.

[0029] Furthermore, setting at least one measurement time point includes:

[0030] Obtain the planned depth-time curve of the external underwater detection equipment mounted on the marine underwater corrosion potential measurement device;

[0031] Obtain the slope of each position on the planned depth-time curve of the dive;

[0032] The planned depth-time curve of the dive is segmented according to the slope to obtain multiple curve segments;

[0033] For any of the curve segments, at least one measurement time point is set in the time period corresponding to the curve segment; wherein, the number of measurement time points set is positively correlated with the slope corresponding to the curve segment.

[0034] Furthermore, the main control module is also used to perform filtering, fitting, and calibration processing on the corrosion potential data obtained at each measurement time point corresponding to each curve segment; the main control module is also used to determine the interval time point and call the measurement module to output the reverse voltage at the interval time point; wherein, the interval time point is the time point between the time periods corresponding to two adjacent curve segments.

[0035] The beneficial effects of this invention are as follows: The marine underwater corrosion potential measuring device in the embodiments, by encapsulating functional modules such as the main control module, real-time clock module, and measurement module inside a pressure-resistant shell, achieves a compact structure with strong pressure resistance and small size. This allows the marine underwater corrosion potential measuring device to be deployed independently or together with external underwater detection equipment to various underwater depths in the marine environment for in-situ material corrosion testing. By setting up the measurement module, high-precision corrosion potential data of corrosion test samples at various underwater depths can be detected, providing data support for studying the corrosion mechanisms of different materials under deep-sea conditions and providing a basis for the design and material selection of deep-sea engineering equipment and marine engineering facilities. By setting up the real-time clock module, the main control module can be triggered to call the measurement module at a specific time point to measure the corrosion potential data, allowing the detected corrosion potential data to be aggregated and aligned with measurement data from other devices. Furthermore, the main control module can execute various measurement modes according to the timing of the real-time clock module, improving the flexibility of the measurement. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the underwater corrosion potential measurement device in the embodiment.

[0037] Figure 2 This is a schematic diagram of the electrode probe structure in the embodiment;

[0038] Figure 3 This is a schematic diagram illustrating the working principle of the measurement module in the embodiment;

[0039] Figure 4 This is a flowchart illustrating the continuous measurement mode in the embodiment.

[0040] Figure 5 This is a flowchart illustrating the real-time measurement mode in the embodiment.

[0041] Figure 6 This is a schematic diagram showing the comparison and error between the measurement results of the marine underwater corrosion potential measurement device before filtering calibration and the measurement results of a commercial potential measuring instrument in the embodiment;

[0042] Figure 7 This is a comparison and error diagram of the measurement results after filtering and calibration of the marine underwater corrosion potential measurement device in the embodiment and the measurement results of a commercial potential measuring instrument;

[0043] Figure 8 This is a schematic diagram comparing the measurement results of the marine underwater corrosion potential measurement device and the commercial electrochemical workstation in the embodiment;

[0044] Figure 9 This is a schematic diagram illustrating the principle of steps S101B-S104B in the embodiment. Detailed Implementation

[0045] Current in-situ corrosion potential measurement techniques in the ocean have the following defects or shortcomings:

[0046] 1. Limited measurement accuracy

[0047] The underwater environment is complex and may contain various interference signals, such as water flow and electromagnetic fields, which can affect the accuracy and precision of measurement results. For example, in a marine environment, changes in salinity and temperature can cause fluctuations in conductivity, thus interfering with the measurement of corrosion potential.

[0048] The contact stability between the measuring probe and the object being measured is difficult to guarantee. Poor contact may occur under the impact of water flow, leading to measurement errors.

[0049] 2. Data transmission issues

[0050] Underwater communication conditions are relatively poor, which may lead to delays, loss, or distortion in the transmission of measurement data. For example, wireless transmission may be affected by water absorption and refraction, while wired transmission may be hampered by problems such as cable damage and length limitations.

[0051] 3. Equipment durability

[0052] When operating in harsh underwater environments for extended periods, measuring devices are susceptible to corrosion, biofouling, and water pressure, which can reduce their lifespan and performance stability. For example, marine organisms adhering to the device's surface may block measurement channels or affect sensor sensitivity.

[0053] 4. Difficult to calibrate and maintain

[0054] The underwater environment complicates and complicates the calibration and routine maintenance of measuring devices. Specialized equipment and technicians are required for underwater operations, increasing costs and time investment.

[0055] 5. Insufficient adaptability to complex environments

[0056] The water quality, flow rate, temperature and other conditions vary greatly in different water areas, and existing measuring devices may not be able to adapt well to various complex underwater environments, thus affecting the measurement results.

[0057] 6. The measurement mode is simple and lacks real-time performance.

[0058] The existing devices typically perform continuous measurement data acquisition at certain time intervals. The measurement mode is relatively simple and singular, and cannot be well integrated with other underwater detection equipment.

[0059] Based on the above principles, this embodiment provides a marine underwater corrosion potential measurement device. (Refer to...) Figure 1The underwater corrosion potential measurement device for marine applications includes components such as a battery module, a power module, a real-time clock module, a measurement module, a main control module, and a pressure-resistant housing. The battery module, power module, real-time clock module, measurement module, and main control module can be mounted on a single circuit board, which is then encapsulated together within the pressure-resistant housing.

[0060] The pressure-resistant housing is designed and manufactured from 316L stainless steel with a pressure resistance of 30MPa. Its dimensions are cylindrical with an inner diameter of 60mm, designed to fit the circuit board size of the measuring device. The housing has an openable top cover, sealed with a threaded interface and a sealing ring. Four secondary watertight interfaces are installed at the bottom of the housing for connecting corrosion test samples. The surface of the housing is coated with an anti-corrosion material.

[0061] Reference Figure 1 The top cover has multiple pre-drilled watertight interfaces for connecting multi-core watertight cables.

[0062] The battery module includes a lithium-ion battery pack and a power management module. The power management module primarily manages the charging of the lithium-ion battery. It connects to external devices (such as external underwater detection equipment) through a pre-reserved watertight interface on the top cover, providing charging voltage to ensure the device is always fully charged and can communicate. The power module steps down the lithium battery voltage to supply power to each module and filters the power supply to reduce ripple voltage.

[0063] In this embodiment, a microcontroller can be used as the core processing chip, along with an E2PROM storage module and a TTL-to-RS485 communication module to form the main control module. This main control module is used to control the measurement process and communication of the device. The core program of the main control module is compatible with the Modbus RTU communication protocol, supporting communication with other sensor equipment compatible with the Modbus RTU protocol, thus offering greater scalability.

[0064] In this embodiment, the real-time clock module is built around the DS1302 chip and is mainly used to record the real-time clock. After initialization and time synchronization by the main control module, the real-time clock module can automatically keep time. When the main control module performs measurement, it can directly read the current time data to control the measurement process.

[0065] For example, after the real-time clock module performs time synchronization, the clock can keep time automatically. The main control module can call and read the timing control measurement process of the real-time clock module, and can be used to measure and synchronize with different marine engineering equipment, and to summarize and align measurement data with other equipment.

[0066] In this embodiment, the measurement module uses a low-noise, low-power instrumentation amplifier as the core of the front-end signal processing, and adds corresponding filtering and multiplexing circuits to acquire voltage signals from multiple electrodes. The acquired signals are transmitted to a 16-bit AD conversion chip for conversion processing, achieving a potential accuracy of 0.1mV. The results are then transmitted back to the main control module for calculation, processing, and storage. The multiplexer and instrumentation amplifier in the measurement module are connected between multiple electrode systems and the AD conversion chip for potential data acquisition. Rail-to-rail chip matching is used to ensure high accuracy and low offset of the potential data. Switching between measurements of different electrode systems is performed automatically in the main control program.

[0067] In this embodiment, when using Figure 1 When using the marine underwater corrosion potential measuring device shown, a corrosion test sample can be mounted on the outside of the pressure hull. The corrosion test sample (via a second watertight interface) is connected to the measuring module, and then the marine underwater corrosion potential measuring device, along with the mounted corrosion test sample, is deployed underwater in the marine environment. Specifically, the marine underwater corrosion potential measuring device (via a first watertight interface) can be connected and fixed to an external underwater detection device, thereby deploying the external underwater detection device, the marine underwater corrosion potential measuring device, and the mounted corrosion test sample into the marine environment. Alternatively, the marine underwater corrosion potential measuring device and the mounted corrosion test sample can be suspended and deployed underwater in the marine environment separately via a cable.

[0068] After the underwater corrosion potential measuring device enters the target depth in the ocean, the corrosion test sample is exposed to seawater and will generate a corrosion potential due to external corrosion in the marine environment. The main control module starts the measurement program and calls the measurement module to measure the corrosion test sample, thereby obtaining the corrosion potential data of the corrosion test sample. The measurement module transmits the corrosion potential data to the main control module, which stores the corrosion potential data.

[0069] In this embodiment, if the main control module is connected to an external underwater detection device or other host computer through the first watertight interface, the main control module can transmit the corrosion potential data measured by the measurement module to the host computer in real time. Alternatively, the main control module can first store the corrosion potential data, and after the measurement is completed, the marine underwater corrosion potential measuring device is retrieved as a whole, and then the host computer and the main control module are connected, and the corrosion potential data is exported to the host computer through software.

[0070] The marine underwater corrosion potential measurement device in this embodiment achieves a compact structure with high pressure resistance and small size by encapsulating functional modules such as the main control module, real-time clock module, and measurement module inside a pressure-resistant housing. This allows the device to be deployed independently or together with external underwater detection equipment to various underwater depths in the marine environment for in-situ material corrosion testing. The measurement module detects corrosion potential data of the test samples at various underwater depths, providing data support for studying the corrosion mechanisms of different materials under deep-sea conditions and providing a basis for the design and material selection of deep-sea engineering equipment and facilities. The real-time clock module triggers the main control module to call the measurement module at specific times to measure corrosion potential data, allowing the detected corrosion potential data to be aggregated and aligned with measurement data from other devices. Furthermore, the main control module can execute various measurement modes based on the timing of the real-time clock module.

[0071] The underwater corrosion potential measurement device in this embodiment can fill the gap between the beginning and end states in actual marine corrosion research, more accurately characterize and predict the service safety of marine engineering equipment in actual marine environments, ensure the service safety of marine engineering equipment, and has high practicality and economic benefits for understanding the generation and transformation laws of corrosion products and guiding the development of high-performance marine engineering equipment materials.

[0072] The marine underwater corrosion potential measuring device in this embodiment can be connected to an external underwater detection device through a first watertight interface, thereby realizing external power supply and real-time uploading of detected corrosion potential data; by setting up a battery module and a power module, it can operate with an independent power supply.

[0073] In this embodiment, the measurement module is connected to the corrosion test sample via a potential probe. Specifically, a potential probe can be used. Figure 2 The three-electrode probe shown is used as a potential probe. (Refer to...) Figure 2 The three-electrode probe has a watertight connector at one end, which can be externally mounted on a pressure-resistant housing and connected to one of the second watertight interfaces. The other end of the probe includes three mounting brackets for the reference electrode, auxiliary electrode, and working electrode, respectively. The reference electrode can be made of solid Ag or AgCl, the auxiliary electrode can be made of Pt wire, and the working electrode is the corrosion test sample. Specifically, the corrosion test sample (e.g., a certain metal) can be pre-processed into a structure with one cylindrical end and the other end being a 1 cm × 1 cm cube. The cylindrical end is then mounted on the mounting bracket of the three-electrode probe.

[0074] In this embodiment, the measurement module can be connected to multiple... Figure 2The three-electrode probe shown is used, and different three-electrode probes are multiplexed to enable simultaneous measurement of multiple corrosion test samples.

[0075] The working principle of the measurement module is as follows: Figure 3 As shown. (Refer to...) Figure 3 The measurement module includes an auxiliary electrode, a reference electrode selection control unit, an A / D conversion chip, a signal amplification and filtering chip, and a potential and current acquisition control unit. Taking one corrosion test sample (e.g., corrosion test sample 1) as an example, when the main control module calls the measurement module, the measurement module selects the reference electrode (reference electrode 1) and the auxiliary electrode (auxiliary electrode 1) mounted on the same three-electrode probe holder as corrosion test sample 1 through the auxiliary electrode and reference electrode selection control unit. It measures the voltage between reference electrode 1 and auxiliary electrode 1, and the voltage between reference electrode 1 and corrosion test sample 1. After preprocessing these two voltages through signal amplification, filtering, and A / D conversion, the voltage difference between the two voltages is calculated, thus obtaining the corrosion potential data of corrosion test sample 1 obtained in this measurement process. The measurement module sends the measured corrosion potential data to the main control module through a data interface.

[0076] In this embodiment, the main control module can select between continuous measurement mode and real-time measurement mode for measurement. Specifically, the host computer can set the main control module to select the measurement mode.

[0077] If the main control module is set to execute continuous measurement mode, then when the main control module calls the measurement module to measure the corrosion potential data of the corrosion test sample according to the timing of the real-time clock module, the following steps can be performed:

[0078] S1A. Set the measurement start delay time T1, the measurement time interval T2, and the number of measurement data points N;

[0079] S2A. Based on the timing of the real-time clock module, determine whether the measurement start delay time T1 has elapsed;

[0080] S3A. When the delay time T1 before the start of the measurement has elapsed, determine whether the measurement time interval T2 has elapsed based on the timing of the real-time clock module;

[0081] S4A. Each time the measurement time interval T2 elapses, the measurement module is invoked to measure the corrosion test sample, obtain a corresponding corrosion potential data, and record the number of measurements.

[0082] S5A. When the cumulative number of measurements reaches the number of measurement data points N, the measurement process stops.

[0083] The process of steps S1A-S5A is as follows: Figure 4As shown.

[0084] Reference Figure 4 In step S1A, the main control module can be configured to determine data such as the delay time T1 before measurement starts, the measurement time interval T2, and the number of measurement data points N.

[0085] In step S2A, the real-time clock module sends a timing signal to the main control module, enabling the main control module to perform timing. The main control module can use a specific moment (such as the moment the main control module is powered on, or the moment the underwater corrosion potential measuring device is deployed in the water) as the zero point to time and determine whether the measurement start delay time T1 has elapsed.

[0086] When the timing reaches the measurement start delay time T1, that is, the measurement start delay time T1 has elapsed since the zero point, the main control module executes step S3A to set a new zero point, start timing and determine whether the measurement time interval T2 has elapsed.

[0087] When the timing reaches the measurement time interval T2, that is, after the measurement time interval T2 has elapsed since the new zero point, the main control module executes step S4A, calls the measurement module to measure the corrosion test sample to obtain a corresponding corrosion potential data (corrosion potential data 1), and records one measurement count, i.e., measurement count = measurement count + 1; the main control module executes step S5A to determine whether the measurement count ≥ the number of measurement data points N. If not, it returns to step S3A, sets a new zero point, starts timing, and determines whether the measurement time interval T2 has elapsed. When the timing reaches the measurement time interval T2, that is, after the measurement time interval T2 has elapsed since the new zero point, the main control module executes step S4A, calls the measurement module to measure the corrosion test sample to obtain a corresponding corrosion potential data (corrosion potential data 2), and records one measurement count, i.e., measurement count = measurement count + 1. The main control module executes step S5A to determine whether the measurement count ≥ the number of measurement data points N. If not, it returns to step S3A... until the measurement count ≥ the number of measurement data points N, the underwater corrosion potential measuring device stops working and enters a low-power state.

[0088] In this embodiment, by executing steps S1A-S5A, the marine underwater corrosion potential measuring device can be controlled to measure the corrosion test sample at regular intervals to obtain the corrosion potential data at that time, and finally obtain N corrosion potential data.

[0089] When performing steps S1A-S5A, the delay time T1 before the measurement starts can be set to the estimated time for the underwater corrosion potential measuring device to descend to the target depth, and the measurement time interval T2 can be set to the operating frequency of the external underwater detection equipment, so that the underwater corrosion potential measuring device can maintain data alignment with the external underwater detection equipment.

[0090] If the main control module is set to perform real-time measurement mode, then when the main control module calls the measurement module to measure the corrosion potential data of the corrosion test sample according to the timing of the real-time clock module, the following steps can be performed:

[0091] S1B. Set t1, t2...t N Wait for at least one measurement time point;

[0092] S2B. Determine whether the measurement time point has been reached based on the timing of the real-time clock module;

[0093] S3B. When the measurement time point is reached, the measurement module is invoked to measure the corrosion test sample and obtain a corresponding corrosion potential data.

[0094] The process of steps S1B-S3B is as follows: Figure 5 As shown.

[0095] Reference Figure 5 In step S1B, the main control module can be configured to determine t1, t2...t N There are N measurement time points, where t1, t2, ..., t... N The measurement time points can be time series with equal time differences, or they can be set to specific time points according to requirements, or they can be set randomly.

[0096] After executing step S1B, the main control module sets the zero point and starts timing according to the timing signal from the real-time clock module, determining whether t1, t2...t have been reached from the zero point. N Measurement time points, etc.

[0097] In step S3B, when the timing reaches measurement time point t1, the main control module calls the measurement module to measure the corrosion test sample, obtaining corrosion potential data 1 measured at t1, and the main control module continues timing; when the timing reaches measurement time point t2, the main control module calls the measurement module to measure the corrosion test sample, obtaining corrosion potential data 2 measured at t2... and so on, until the timing reaches measurement time point t... N The main control module calls the measurement module to measure the corrosion test sample and obtain t. N The measured corrosion potential data N.

[0098] In this embodiment, the real-time measurement mode implemented by executing steps S1B-S3B enables the measurement of corrosion potential data at any time, thereby obtaining the corrosion potential data of the corrosion test sample at different times.

[0099] In this embodiment, the main control module can, when executing continuous measurement mode, before each measurement time interval T2, call the measurement module to measure the corrosion potential data of the corrosion test sample to obtain corrosion potential data, and when executing real-time measurement mode, before each call to the measurement module to measure corrosion potential data 1, corrosion potential data 2, etc., of the corrosion test sample to obtain corrosion potential data, apply reverse voltages between the auxiliary electrode and the reference electrode, and between the working electrode and the reference electrode, of the three-electrode probe. Specifically, the reverse voltage between the auxiliary electrode and the reference electrode is opposite to the voltage between the auxiliary electrode and the reference electrode when the measurement module is called for measurement; similarly, the reverse voltage between the working electrode and the reference electrode is opposite to the voltage between the working electrode and the reference electrode when the measurement module is called for measurement.

[0100] In this embodiment, by applying a reverse voltage to the electrodes of the three-electrode probe through the measurement module, the electrodes can be depolarized. This forcibly dissolves the corroded or electrochemically reacted parts of the electrode surface to ensure its freshness. This mitigates or eliminates the impact of corrosion already present in the electrodes (especially the working electrode) from previous measurements or immersion in seawater, ensuring the accuracy and scientific validity of measurement data at different depths. Users can control whether to apply a reverse voltage to forcibly dissolve and depolarize the electrode surface before measurement via host computer software, and can set the depolarization duration, i.e., the duration of the applied reverse voltage.

[0101] In this embodiment, the main control module is also used to perform filtering, fitting, and calibration processing on the measured corrosion potential data.

[0102] For example, for N corrosion potential data points (corrosion potential data 1, corrosion potential data 2, ..., corrosion potential data N) obtained by performing real-time measurement, median averaging filtering can be used. Specifically, the corrosion potential data points 1, 2, ..., N are sorted using a sorting algorithm, discarding the two maximum and two minimum values, and the arithmetic mean of the remaining corrosion potential data is calculated. This can reduce or even eliminate sampling value deviations caused by occasional pulse interference.

[0103] For example, for N corrosion potential data such as corrosion potential data 1, corrosion potential data 2, ..., corrosion potential data N obtained by performing real-time measurement mode, calibration can be performed by piecewise linear fitting with a high-precision potential measuring instrument. By collecting 20 linear measurement points within the measurement range of ±2V, and comparing the error distribution with the high-precision potential measuring instrument piecewise, the fitting calibration coefficient is compensated into the data processing of the acquisition algorithm, thereby reducing measurement error.

[0104] The comparison and error between the measurement results of the marine underwater corrosion potential measuring device in this embodiment before filtering calibration and the measurement results of a commercial potential measuring instrument are as follows: Figure 6 As shown, the comparison and error between the measurement results after filtering and calibration and the measurement results of a commercial potentiometer are as follows. Figure 7 As shown, the results are compared with those measured by the Gamry commercial electrochemical workstation. Figure 8 As shown. According to Figure 6 , Figure 7 and Figure 8 It can be seen that the measurement error of the marine underwater corrosion potential measuring device in this embodiment is relatively small.

[0105] In this embodiment, the marine underwater corrosion potential measuring device can be mounted on external underwater detection equipment such as CTD detectors (Conductivity, Temperature, Depth), moorings, buoys, manned submersibles (HOV), autonomous underwater vehicles (AUV), tethered remotely operated vehicles (ROV), or underwater gliders, and deployed into the seawater simultaneously with the external underwater detection equipment.

[0106] In this embodiment, the main control module executes step S1B in real-time measurement mode, which is to set t1, t2...t N When waiting for at least one measurement time point, the following steps can be performed:

[0107] S101B. Acquire the planned depth-time curve of the external underwater detection equipment carried by the marine underwater corrosion potential measurement device;

[0108] S102B. Obtain the slope of each position on the planned depth-time curve of the dive;

[0109] S103B. The planned depth-time curve of the dive is segmented according to the slope to obtain multiple curve segments;

[0110] S104B. For any curve segment, at least one measurement time point is set in the time period corresponding to the curve segment; wherein, the number of measurement time points set is positively correlated with the slope corresponding to the curve segment.

[0111] In this embodiment, the principle of steps S101B-S104B is as follows: Figure 9 As shown.

[0112] In step S101B, the main control module interacts with the onboard external underwater detection equipment to obtain the planned depth-time curve of the external underwater detection equipment. The planned depth-time curve represents the relationship between the planned depth reached by the external underwater detection equipment during this underwater detection mission and the time. Since the marine underwater corrosion potential measurement device is mounted on the external underwater detection equipment, the planned depth-time curve also represents the relationship between the future depth reached by the marine underwater corrosion potential measurement and the time.

[0113] In step S102B, with time as the horizontal axis and depth as the vertical axis, the slope of each point on the planned depth-time curve of the dive can be calculated.

[0114] In step S103B, the planned depth-time curve can be divided into multiple curve segments based on the slope of each point on the planned depth-time curve. The slopes of points within the same curve segment fall within the same range, while the average slopes of different curve segments differ. For example, as... Figure 9 As shown, the planned depth-time curve of the dive is divided into several segments corresponding to time periods t1″-t2″, t2″-t3″, t3″-t4″, and t4″-t5″. Among them, the curve segment corresponding to the time period t1″-t2″ has the slope of each point within the same interval, making the slope of each point within it roughly the same. This curve segment as a whole is in a state of "rapid descent". The curve segment adjacent to it, that is, the curve segment corresponding to the time period t2″-t3″, also has the slope of each point within the same interval, making the slope of each point within it roughly the same. This curve segment as a whole is in a state of "maintaining the same depth for a long time".

[0115] In step S104B, measurement time points are set within the time period corresponding to each curve segment based on the magnitude of the slope (e.g., the average of the absolute values ​​of the slopes at each point). For example, for a curve segment within the corresponding time period t1″-t2″, its overall slope is relatively large, so more measurement time points are set within the time period t1″-t2″; while for a curve segment within the corresponding time period t2″-t3″, its overall slope is relatively small, so fewer measurement time points are set within the time period t2″-t3″.

[0116] In this embodiment, when the main control module executes the real-time measurement mode, it first passes through the measurement time points within the time period t1″-t2″. During this time period, the main control module does not call the measurement module to output reverse voltage, but instead continuously measures the corrosion potential data at each measurement time point within the time period t1″-t2″, and performs fitting and calibration processing on the corrosion potential data measured at each measurement time point within the time period t1″-t2″. Then, when the time point reaches t2″, which is the time point between two adjacent curve segments (i.e., the interval time point), the main control module calls the measurement module to output reverse voltage, causing the working electrode to change... The electrode is initially in a fresh state. Then, during the measurement time interval t2″-t3″, the main control module does not call the measurement module to output reverse voltage during this interval. Instead, it continuously measures the corrosion potential data at each measurement time point within the t2″-t3 interval and performs fitting and calibration processing on this data. Next, at time point t3″, which is also an interval time point, the main control module calls the measurement module to output reverse voltage, thus bringing the working electrode back to a fresh state… Finally, after all the measurement time points, the corresponding corrosion potential data is obtained.

[0117] In this embodiment, the principle of executing steps S101B-S104B is as follows: When the underwater corrosion potential measuring device is mounted on an external underwater detection device, the activity of the underwater corrosion potential measuring device will be affected by the external underwater detection device. For example, the external underwater detection device may need to perform its own detection task, thus requiring it to descend according to a predetermined plan, such as a planned depth-time curve. The external underwater detection device may not stay at a specific depth for a sufficient period of time for the underwater corrosion potential measuring device to perform measurements. By executing steps S101B-S104B, the underwater corrosion potential measuring device can, within the relatively fast descent period of the external underwater detection device, obtain data through... By setting a greater number of measurement time points to continuously obtain corrosion potential data, and without the need to depolarize the electrodes within the same time period, the corrosion potential data obtained continuously within the same time period can be filtered and fitted separately, which helps to reduce measurement errors caused by insufficient dwell time at a specific depth. However, when the external underwater detection equipment descends slowly or maintains a constant depth for a long period of time, setting fewer measurement time points helps to reduce the measurement frequency of corrosion potential data while still obtaining corrosion potential data with acceptable error. This reduces the impact of applying voltage or current or transmitting data on the external underwater detection equipment during marine underwater corrosion potential measurement.

[0118] The underwater corrosion potential measurement device in this embodiment can realize the full profile of corrosion electrochemical measurement at various depths underwater, thus enabling important applications in the following fields:

[0119] Marine engineering: Used to detect corrosion of various facilities in the marine environment, such as offshore oil platforms, crude oil terminals, oil and seawater pipelines, and ships. Understanding the corrosion rate, corrosion behavior, and localized corrosion tendency of these facilities at different depths and locations underwater is crucial for implementing effective protective measures, extending their service life, and ensuring their safe operation.

[0120] Metallic materials research: This research investigates the corrosion patterns and correlations of various metals in different depth zones of marine environments (such as atmospheric zone, splash zone, tidal zone, underwater zone, and mud zone), as well as the influence of different alloying elements on the corrosion performance of steel grades under different zone conditions.

[0121] Cathodic protection effectiveness evaluation: Evaluate the anti-corrosion electrochemical performance of impressed current cathodic protection and aluminum-based sacrificial anodes in seawater, and provide a basis for the design and optimization of cathodic protection systems.

[0122] Environmental monitoring: helps understand the impact of changes in the chemical properties of underwater environments such as oceans, rivers, and lakes on metal corrosion.

[0123] Coating and plating research: Studying the destructive effects of corrosive substances on coatings and platings in order to develop more effective protective coating and plating technologies.

[0124] Material screening and development: In the development of new metallic materials or anti-corrosion materials, underwater full-section corrosion electrochemical measurement can quickly evaluate the corrosion resistance of materials in actual underwater environments, thereby screening out materials with better performance.

[0125] Corrosion Mechanism Research: In-depth exploration of the electrochemical processes and mechanisms of underwater metal corrosion, providing theoretical support for the research of corrosion protection methods.

[0126] Monitoring of underwater structures: For example, long-term monitoring of underwater structures such as wharf steel pipe piles and bridge foundations to detect corrosion problems in a timely manner and prevent potential safety hazards.

[0127] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. Furthermore, the descriptions of "upper," "lower," "left," and "right" used in this disclosure are only relative to the relative positional relationships of the components of this disclosure in the accompanying drawings. The singular forms "a," "an," and "the" used in this disclosure are also intended to include the plural forms, unless the context clearly indicates otherwise. Moreover, unless otherwise defined, all technical and scientific terms used in this embodiment have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this embodiment specification is only for describing particular embodiments and is not intended to limit the invention. The term "and / or" as used in this embodiment includes any combination of one or more of the associated listed items.

[0128] It should be understood that although the terms first, second, third, etc., may be used to describe various elements in this disclosure, these elements should not be limited to these terms. These terms are only used to distinguish elements of the same type from each other. For example, a first element may also be referred to as a second element without departing from the scope of this disclosure, and similarly, a second element may also be referred to as a first element. The use of any and all instances or exemplary language (“e.g.,” “such as,” etc.) provided in this embodiment is intended only to better illustrate embodiments of the invention and, unless otherwise required, does not impose a limitation on the scope of the invention.

[0129] It should be recognized that embodiments of the present invention can be implemented or carried out by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer-readable storage medium. The method can be implemented using standard programming techniques—including a non-transitory computer-readable storage medium configured with a computer program, wherein such a storage medium causes the computer to operate in a specific and predefined manner—according to the methods and drawings described in the specific embodiments. Each program can be implemented in a high-level procedural or object-oriented programming language to communicate with the computer system. However, if desired, the program can be implemented in assembly or machine language. In any case, the language can be a compiled or interpreted language. Furthermore, for this purpose, the program can run on a programmed application-specific integrated circuit (ASIC).

[0130] Furthermore, the procedures described in this embodiment can be performed in any suitable order unless otherwise indicated by this embodiment or clearly contradicted by the context. The procedures (or variations and / or combinations thereof) described in this embodiment can be executed under the control of one or more computer systems configured with executable instructions, and can be implemented by hardware or a combination thereof as code (e.g., executable instructions, one or more computer programs, or one or more applications) that commonly executes on one or more processors. A computer program includes multiple instructions executable by one or more processors.

[0131] Furthermore, the method can be implemented in any suitable type of computing platform, including but not limited to personal computers, minicomputers, mainframes, workstations, networked or distributed computing environments, standalone or integrated computer platforms, or in communication with charged particle tools or other imaging devices, etc. Aspects of the invention can be implemented as machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optical read and / or write storage medium, RAM, ROM, etc., such that it is readable by a programmable computer, and when the storage medium or device is read by the computer, it can be used to configure and operate the computer to perform the processes described herein. Furthermore, the machine-readable code, or portions thereof, can be transmitted via wired or wireless networks. The invention of this embodiment includes these and other different types of non-transitory computer-readable storage media when such media comprises instructions or programs that implement the steps above in conjunction with a microprocessor or other data processor. When programmed according to the methods and techniques of the invention, the invention also includes the computer itself.

[0132] A computer program can be applied to input data to perform the functions of this embodiment, thereby transforming the input data to generate output data stored in non-volatile memory. The output information can also be applied to one or more output devices, such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including specific visual depictions of physical and tangible objects generated on the display.

[0133] The above are merely preferred embodiments of the present invention. The present invention is not limited to the above-described embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention, as long as they achieve the technical effects of the present invention by the same means, should be included within the scope of protection of the present invention. Within the scope of protection of the present invention, the technical solutions and / or implementation methods can have various modifications and variations.

Claims

1. A marine underwater corrosion potential measuring device, characterized in that, The marine underwater corrosion potential measuring device is used to be mounted on an external underwater detection device, which dives according to a predetermined plan. The marine underwater corrosion potential measuring device includes: A potential probe; the potential probe includes a reference electrode, an auxiliary electrode, and a working electrode, wherein the working electrode is a corrosion test sample; Real-time clock module; the real-time clock module is used for timing; Measurement module; the measurement module is used to connect to the corrosion test sample; The main control module is used to call the measurement module to measure the corrosion potential data of the corrosion test sample according to the timing of the real-time clock module. Pressure-resistant housing; the real-time clock module, the measurement module, and the main control module are encapsulated within the pressure-resistant housing; The marine underwater corrosion potential measurement device also includes a battery module and a power supply module; the battery module and the power supply module are used to power the real-time clock module, the measurement module and the main control module; The pressure-resistant housing is coated with an anti-corrosion coating, and the pressure-resistant housing is provided with a first watertight interface and a second watertight interface; The battery module and the main control module are connected to an external underwater detection device through the first watertight interface; The potential probe is installed outside the pressure-resistant housing, and the potential probe is connected to the measurement module through the second watertight interface. The potential probe is used to attach the corrosion test sample. The step of calling the measurement module to measure the corrosion potential data of the corrosion test sample based on the timing of the real-time clock module includes: Set at least one measurement time point; Based on the timing of the real-time clock module, determine whether the measurement time point has been reached; When the measurement time point is reached, the measurement module is invoked to measure the corrosion test sample and obtain a corresponding corrosion potential data. Setting at least one measurement time point includes: Obtain the planned depth-time curve of the external underwater detection equipment mounted on the marine underwater corrosion potential measurement device; Obtain the slope of each position on the planned depth-time curve of the dive; The planned depth-time curve of the dive is segmented according to the slope to obtain multiple curve segments; For any of the curve segments, at least one measurement time point is set in the time period corresponding to the curve segment; wherein, the number of measurement time points set is positively correlated with the slope corresponding to the curve segment; The main control module is also used to determine an interval time point, and at the interval time point, call the measurement module to output a reverse voltage. The reverse voltage between the auxiliary electrode and the reference electrode is opposite to the voltage between the auxiliary electrode and the reference electrode when the measurement module is called for measurement. The reverse voltage between the working electrode and the reference electrode is also opposite to the voltage between the working electrode and the reference electrode when the measurement module is called for measurement. The interval time point is the time point between the time periods corresponding to two adjacent curve segments.

2. The marine underwater corrosion potential measuring device according to claim 1, characterized in that, The main control module is also used to perform filtering, fitting, and calibration processing on the corrosion potential data obtained at each measurement time point corresponding to each curve segment.

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