Marine underwater corrosion potential measuring device

Abstract

The invention discloses a marine underwater corrosion potential measuring device, which is characterized in that functional modules such as a main control module, a real-time clock module and a measuring module are packaged in a pressure-resistant shell, so that a compact structure with high pressure resistance and small size is obtained, and the marine underwater corrosion potential measuring device can be put into various underwater depths of a marine environment; carrying out an in-situ test of material corrosion; by arranging the measuring module, high-precision corrosion potential data of a corrosion test sample at each depth underwater can be detected, and data support can be provided for researching corrosion mechanisms of different materials under deep sea conditions; by arranging the real-time clock module, the main control module can be triggered to call the measurement module at a specific time point to measure and obtain the corrosion potential data, so that the detected corrosion potential data can be summarized and aligned with the measurement data of other equipment, the main control module can execute various different measurement modes, and the measurement flexibility is improved. The method is widely applied to the technical field of corrosion potential measurement.

Description

Technical Field

[0001] The invention relates to the technical field of corrosion potential measurement, in particular to an underwater corrosion potential measurement device for the ocean. Background Art

[0002] The marine environment can corrode various materials, especially metal materials, thus damaging marine detection equipment and marine engineering equipment, affecting their normal use and even endangering safety. Therefore, it is necessary to study the corrosion of materials in the marine environment.

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

[0004] Corrosion experiments on materials can be carried out to measure the corrosion potential of materials in the underwater environment of the ocean. At present, the corrosion research on deep-sea materials is mainly divided into two methods: natural field exposure and laboratory simulation. Real sea tests are closer to the actual service status of materials, and their data are more valuable. In-situ test research helps to reveal the dynamic process of material corrosion on a time scale. Therefore, it is necessary to carry out corrosion potential measurements in real sea. Due to the lack of deep-sea testing methods, most of the current real-sea tests use the weightlessness hanging method, and then test through recovery. It is impossible to display or characterize the corrosion dynamics and aging state of materials in the deep sea in real time. The degree of corrosion can only be judged by sampling and analysis after the experiment. Moreover, it is difficult to achieve seamless transfer of samples during the recovery process, which may cause some impacts on the samples that cannot be evaluated. The deep-sea natural environment test system is complex and the test cost is high. In addition to the deployment, operation and recovery of the test equipment, its reliability is also related to many factors such as geology, environment, equipment, and human factors. There are problems such as sample loss and low device recovery rate. Summary of the invention

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

[0006] The embodiment of the present invention includes a marine underwater corrosion potential measuring device, and the marine underwater corrosion potential measuring device includes:

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

[0008] A measuring module; the measuring module is used to connect to the corrosion test sample;

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

[0010] A pressure-resistant casing; the real-time clock module, the measurement module and the main control module are encapsulated in the pressure-resistant casing.

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

[0012] The surface of the pressure-resistant shell is provided with an anti-corrosion coating, and the pressure-resistant shell 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 on the outside of the pressure-resistant shell, the potential probe is connected to the measurement module via the second watertight interface, and the potential probe is used for externally hanging 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 be carried on external underwater detection equipment.

[0017] Furthermore, the external underwater detection equipment is a CTD detector, a buoy, a buoy, a manned submersible, an autonomous underwater robot, a cable remote-controlled robot or an underwater glider.

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

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

[0020] Determining whether the delay time before the start of the measurement has passed according to the timing of the real-time clock module;

[0021] When the delay time before the start of the measurement has passed, judging whether the measurement time interval has passed according to the timing of the real-time clock module;

[0022] Each time the measurement time interval passes, the measurement module is called to measure the corrosion test sample, a corresponding corrosion potential data is obtained, and the number of measurements is recorded;

[0023] When the cumulative number of measurements reaches the number of measurement data points, the measurement process is stopped.

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

[0025] When selecting to execute the real-time measurement mode, set at least one measurement time point;

[0026] Determining whether the measurement time point has been reached according to the timing of the real-time clock module;

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

[0028] Furthermore, the main control module is also used to call the measurement module to output a reverse voltage before calling the measurement module to measure the corrosion test sample each time, and the main control module is also used to perform filter fitting and calibration processing on each of the corrosion potential data obtained by measurement.

[0029] Further, the setting of at least one measurement time point includes:

[0030] Obtaining a planned diving depth-time curve of an external underwater detection device carried by the marine underwater corrosion potential measuring device;

[0031] Obtaining the slope of each position on the depth-time curve of the dive plan;

[0032] Segmenting the dive plan depth-time curve according to the slope to obtain a plurality of 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 the set measurement time points 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 each of the corrosion potential data measured at each measurement time point corresponding to each of the curve segments; 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 the present invention are as follows: the marine underwater corrosion potential measuring device in the embodiment can obtain a compact structure with strong pressure resistance and small size by encapsulating functional modules such as a main control module, a real-time clock module and a measuring module inside a pressure-resistant shell, so that the marine underwater corrosion potential measuring device can be independently or together with external underwater detection equipment into various underwater depths of the marine environment to conduct in-situ tests on material corrosion; by setting the measuring module, high-precision corrosion potential data of the corrosion test sample at various underwater depths can be detected, so as to provide data support for studying the corrosion mechanism of different materials under deep-sea conditions, and provide a basis for the design and material selection of deep-sea engineering equipment and marine engineering facilities; by setting the real-time clock module, the main control module can be triggered to call the measuring module at a specific time point to measure and obtain corrosion potential data, so that the detected corrosion potential data can be aggregated and aligned with the measurement data of other devices, and the main control module can also execute a variety of different measurement modes according to the timing of the real-time clock module, thereby improving the flexibility of measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the structure of the marine underwater corrosion potential measuring device in the embodiment;

[0037] Figure 2 Schematic diagram of the structure of the electrode probe in the embodiment;

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

[0039] Figure 4 Schematic diagram of the process of continuous measurement mode in the embodiment;

[0040] Figure 5 A schematic diagram of a flow chart of a real-time measurement mode in an embodiment;

[0041] Figure 6 A comparison and error diagram of the measurement results of the marine underwater corrosion potential measurement device before filtering and calibration in the embodiment and the measurement results of the commercial potential measurement instrument;

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

[0043] Figure 8 Schematic diagram of comparison of measurement results of the marine underwater corrosion potential measurement device and the commercial electrochemical workstation in the embodiment;

[0044] Fig. 9 Schematic diagram of the principles of steps S101B-S104B in the embodiment. DETAILED DESCRIPTION

[0045] The current in-situ corrosion potential measurement technology has the following defects or deficiencies:

[0046] 1. Limited measurement accuracy

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

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

[0049] 2. Data transmission issues

[0050] Underwater communication conditions are relatively poor, which may cause transmission delays, loss or distortion of measurement data. For example, wireless transmission may be affected by water absorption and refraction, while wired transmission may be plagued by cable damage, length limitations and other issues.

[0051] 3. Equipment durability

[0052] When placed in harsh underwater environments for a long time, the measuring device is susceptible to corrosion, biological adhesion and water pressure, which can reduce the service life and performance stability of the device. For example, the adhesion of marine organisms on the surface of the device may block the measurement channel or affect the sensitivity of the sensor.

[0053] 4. Difficulty in calibration and maintenance

[0054] The underwater environment makes the calibration and routine maintenance of the measuring device complicated and difficult. Specialized equipment and technicians are required for underwater operations, which increases costs and time investment.

[0055] 5. Lack of adaptability to complex environments

[0056] The water quality, flow rate, temperature and other conditions in different waters vary greatly. 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 measurement mode of the existing device is usually to continuously and uninterruptedly perform measurement and collection at a certain time interval. The measurement mode is relatively simple and single, and cannot be well used in conjunction with other underwater detection equipment.

[0059] Based on the above principle, this embodiment provides a marine underwater corrosion potential measurement device. Figure 1The marine underwater corrosion potential measuring device includes components such as a battery module, a power module, a real-time clock module, a measuring module, a main control module and a pressure-resistant housing. Among them, the battery module, the power module, the real-time clock module, the measuring module and the main control module can be installed on a circuit board and encapsulated inside the pressure-resistant housing together with the circuit board.

[0060] The pressure-resistant shell is designed and manufactured with 316L stainless steel with a pressure resistance of 30MPa. The size of the pressure-resistant shell is designed to be a cylinder with an inner diameter of 60mm according to the size of the measuring device circuit board. The pressure-resistant shell is equipped with an openable top cover, which is sealed with a threaded interface and a sealing ring. Four second watertight interfaces are installed at the bottom of the pressure-resistant shell for connecting corrosion test samples. The surface of the pressure-resistant shell is coated with anti-corrosion material.

[0061] Reference Figure 1 The top cover has reserved multiple first watertight interfaces for the connection of multi-core watertight cables.

[0062] The battery module includes a lithium-ion battery pack and a power management module. The power management module mainly manages the charging of the lithium-ion battery, connects to external equipment (such as external underwater detection equipment) through the first watertight interface reserved on the top cover, and provides charging voltage to keep the device in a state of sufficient battery power and able to communicate. The power module steps down the lithium battery voltage to supply power to each module, and filters the power supply to reduce the ripple voltage.

[0063] In this embodiment, a single-chip microcomputer can be used as the core processing chip, and an E2PROM storage module and a TTL to RS485 communication module can be used as a main control module, which is used to control the measurement process and communication of the device. The main control core program of the main control module is compatible with the Modbus RTU communication protocol, supports communication with other sensor equipment compatible with the Modbus RTU protocol, and has stronger scalability.

[0064] In this embodiment, the real-time clock module is built with the DS1302 chip as the core, and is mainly used to record the real-time clock. After being initialized and time-calibrated by the main control module, the real-time clock module can automatically 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 is calibrated, the clock can run 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 on board, and to align with the measurement data of other equipment.

[0066] In the present embodiment, the measurement module uses a low-noise, low-power instrument amplifier as the front-end signal processing core, and adds corresponding filtering processing circuits and multiplexing circuits to collect multiple electrode voltage signals. The collected signals are transmitted to a 16-bit AD conversion chip for conversion processing, and the potential accuracy reaches 0.1mV. The results are transmitted back to the main control module for calculation, processing and storage. The multiplexer and instrument amplifier included in the measurement module are connected between multiple electrode systems and the AD conversion chip for the collection of potential data, using rail-to-rail chips to ensure high precision and low offset of potential data. The switching between measurements of different electrode systems is automatically performed in the main control program.

[0067] In this embodiment, when using Figure 1 When the marine underwater corrosion potential measuring device is shown, a corrosion test sample can be mounted on the pressure hull, the corrosion test sample can be connected to the measurement module (through the second watertight interface), and then the marine underwater corrosion potential measuring device together with the externally mounted corrosion test sample can be put into the underwater of the marine environment. Specifically, the marine underwater corrosion potential measuring device can be connected and fixed to the external underwater detection equipment (through the first watertight interface), so that the external underwater detection equipment together with the marine underwater corrosion potential measuring device and the externally mounted corrosion test sample can be put into the underwater of the marine environment, or the marine underwater corrosion potential measuring device and the externally mounted corrosion test sample can be suspended and put into the underwater of the marine environment by cables alone.

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

[0069] In this embodiment, if the main control module is connected to a host computer such as an external underwater detection device through a 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; the main control module can also store the corrosion potential data first, and after the measurement is completed, the marine underwater corrosion potential measurement device is recovered 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 measuring device in this embodiment can obtain a compact structure with strong pressure resistance and small size by encapsulating functional modules such as the main control module, the real-time clock module and the measurement module inside the pressure-resistant shell, so that the marine underwater corrosion potential measuring device can be put into various underwater depths of the marine environment independently or together with external underwater detection equipment to conduct in-situ tests on material corrosion; by setting the measurement module, the corrosion potential data of the corrosion test sample at various underwater depths can be detected, so as to provide data support for studying the corrosion mechanism of different materials under deep-sea conditions, and provide a basis for the design and material selection of deep-sea engineering equipment and marine engineering facilities; by setting the real-time clock module, the main control module can be triggered to call the measurement module at a specific time point to measure and obtain the corrosion potential data, so that the detected corrosion potential data can be aggregated and aligned with the measurement data of other equipment, and the main control module can also execute a variety of different measurement modes according to the timing of the real-time clock module.

[0071] The marine underwater corrosion potential measuring device in this embodiment can fill the gap between the initial and final states in real sea corrosion research, more accurately characterize and predict the service safety of marine engineering equipment in real sea environment, ensure the service safety of marine engineering equipment, understand the generation and transformation laws of corrosion products, and guide the development of high-performance marine engineering equipment materials. It has high practicality and economic benefits.

[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 a battery module and a power supply module, it can work with an independent power supply.

[0073] In this embodiment, the measuring module is connected to the corrosion test sample via a potential probe. Figure 2 The three-electrode probe shown is used as a potentiometric probe. Figure 2 One end of the three-electrode probe is a watertight joint, which can be hung on the pressure-resistant shell and connected to one of the second watertight interfaces; the other end of the three-electrode probe includes three holders, which are respectively installed with a reference electrode, an auxiliary electrode and a working electrode, wherein the reference electrode can be made of solid Ag or AgCl and other materials, the auxiliary electrode can be made of Pt wire and other materials, and the working electrode is a corrosion test sample. Specifically, the corrosion test sample (such as a certain metal) can be pre-processed into a structure with one end being cylindrical and the other end being a 1 cm × 1 cm cube, and the cylindrical end is installed on the holder of the three-electrode probe.

[0074] In this embodiment, the measurement module can be connected to multiple Figure 2The three-electrode probe shown in the figure is used, and channels of different three-electrode probes are multiplexed, so that multiple corrosion test samples can be measured simultaneously.

[0075] The working principle of the measurement module is as follows Figure 3 See Figure 3 The measurement module includes auxiliary electrode, reference electrode selection control unit, A / D conversion chip, signal amplification and filtering chip, potential, current acquisition control unit and other parts. Taking one of the corrosion test samples (such as 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) installed on the same three-electrode probe holder as the corrosion test sample 1 through the auxiliary electrode and reference electrode selection control unit, measures the voltage between the reference electrode 1 and the auxiliary electrode 1, and measures the voltage between the reference electrode 1 and the corrosion test sample 1. After the two voltages are pre-processed by signal amplification, filtering and A / D conversion, the voltage difference between the two voltages is calculated, thereby obtaining the corrosion potential data of the corrosion test sample 1 measured in this measurement process. The measurement module sends the measured corrosion potential data to the main control module through the data interface.

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

[0077] If the main control module is set to execute the 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 specifically performed:

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

[0079] S2A. According to the timing of the real-time clock module, it is determined whether the delay time T1 has passed before the measurement starts;

[0080] S3A. When the delay time T1 before the measurement starts, according to the timing of the real-time clock module, it is determined whether the measurement time interval T2 has passed;

[0081] S4A. Each time after the measurement time interval T2, the measurement module is called 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 is stopped.

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

[0084] Reference Figure 4 In step S1A, the main control module can be set to determine data such as the delay time T1 before the start of measurement, 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, so that the main control module can perform timing. The main control module can use a specific time (such as the time when the main control module is turned on, or the time when the marine underwater corrosion potential measurement device is put into water) as the zero point to time and determine whether the delay time T1 before the measurement starts has passed.

[0086] When the timing reaches the delay time T1 before the measurement starts, that is, the delay time T1 before the measurement starts has passed since the zero point, the main control module executes step S3A, sets a new zero point, counts and determines whether the measurement time interval T2 has passed.

[0087] When the timing reaches the measurement time interval T2, that is, after the measurement time interval T2 has passed 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 the number of measurements once, that is, the number of measurements = the number of measurements + 1; the main control module executes step S5A, determines whether the number of measurements ≥ the number of measurement data points N, if not, returns to execute step S3A, sets a new zero point, counts and determines whether the measurement time interval T2 has passed, when the timing reaches the measurement time interval T2, that is, after the measurement time interval T2 has passed 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 the number of measurements once, that is, the number of measurements = the number of measurements + 1, the main control module executes step S5A, determines whether the number of measurements ≥ the number of measurement data points N, if not, returns to execute step S3A... until the number of measurements ≥ the number of measurement data points N, the marine underwater corrosion potential measurement device stops working and enters a low power consumption 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 a regular interval to obtain the corrosion potential data at that time, and finally obtain N corrosion potential data.

[0089] When executing steps S1A-S5A, the delay time T1 before the measurement starts can be set to the estimated time it takes for the marine underwater corrosion potential measuring device to dive 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 marine underwater corrosion potential measuring device can maintain data alignment with the external underwater detection equipment.

[0090] If the main control module is set to execute the 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 specifically performed:

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

[0092] S2B. According to the timing of the real-time clock module, determine whether the measurement time point has been reached;

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

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

[0095] Reference Figure 5 In step S1B, the main control module can be set to determine t1, t2, ..., t N There are N measurement time points. Among them, t1, t2, ..., t N The equal measurement time points may be a time series with equal time differences, or their specific time points may be set according to requirements, or may be set by random setting or other methods.

[0096] After executing step S1B, the main control module sets the zero point, and performs timing according to the timing signal of the real-time clock module to determine whether t1, t2, ..., t N Wait for the measurement time point.

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

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

[0099] In this embodiment, the main control module can call the measurement module to apply a reverse voltage between the auxiliary electrode and the reference electrode of the three-electrode probe, and between the working electrode and the reference electrode, before calling the measurement module to measure the corrosion test sample to obtain corrosion potential data each time after the measurement time interval T2, and before calling the measurement module to measure the corrosion test sample to obtain corrosion potential data 1, corrosion potential data 2, etc., when executing the real-time measurement mode. 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 calling the measurement module to apply a reverse voltage to the electrodes of the three-electrode probe, the electrodes can be depolarized, and the portions of the electrode surface that are corroded or undergo electrochemical reactions are forcibly dissolved to ensure the freshness of the electrode surface, thereby reducing or eliminating the influence of certain corrosion behaviors of the electrodes (especially the working electrodes) that have occurred in the last measurement or soaked in seawater, and ensuring the accuracy and scientificity of each measurement data at different depths. The user can control whether to apply a reverse voltage to force the electrode surface to dissolve for depolarization before measurement through the host computer software, and can set the depolarization duration, that is, the duration of the applied reverse voltage.

[0101] In this embodiment, the main control module is also used to perform filter fitting and calibration processing on each corrosion potential data obtained by measurement.

[0102] For example, N pieces of corrosion potential data, such as corrosion potential data 1, corrosion potential data 2, ..., corrosion potential data N, obtained by executing the real-time measurement mode, can be filtered by the median average filtering method. Specifically, the corrosion potential data 1, corrosion potential data 2, ..., corrosion potential data N are sorted by a sorting algorithm, the two maximum values ​​and the two minimum values ​​are discarded, and the arithmetic mean is calculated for the remaining corrosion potential data, thereby reducing or even eliminating the sampling value deviation caused by the 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 executing the real-time measurement mode, they can be calibrated by performing piecewise linear fitting with a high-precision potential measuring instrument. By collecting 20 linear measurement points within the measurement range of ±2V, they are piecewise compared with the high-precision potential measuring instrument for linear fitting according to their error distribution, and the fitting calibration coefficient is compensated to the data processing of the acquisition algorithm, thereby reducing the measurement error.

[0104] The comparison and error between the measurement results of the underwater corrosion potential measuring device of the present embodiment before filtering and calibration and the measurement results of the commercial potential measuring instrument are shown in the figure below. Figure 6 As shown in the figure, the comparison and error between the measurement results after filter calibration and the measurement results of the commercial potentiometer are shown in the figure. Figure 7 As shown in the figure, the results are compared with those of Gamry's commercial electrochemical workstation. Figure 8 As shown. Figure 6 , Figure 7 and Figure 8 It can be seen that the measurement error of the marine underwater corrosion potential measurement device in this embodiment is relatively small.

[0105] In this embodiment, the marine underwater corrosion potential measuring device can be carried on external underwater detection equipment such as a CTD detector (Conductivity, Temperature, Depth, temperature and salinity detector), a buoy, a buoy, a manned submersible (HOV), an autonomous underwater robot (AUV), a cable remote-controlled robot (ROV) or an underwater glider, and put into the sea water at the same time as the external underwater detection equipment.

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

[0107] S101B. Obtain the planned depth-time curve of the dive 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 dive plan depth-time curve;

[0109] S103B. Segmenting the dive plan depth time curve according to the slope to obtain multiple curve segments;

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

[0111] In this embodiment, the principles of steps S101B-S104B are as follows Fig. 9 shown.

[0112] In step S101B, the main control module interacts with the external underwater detection equipment to obtain the dive plan depth time curve of the external underwater detection equipment. The dive plan depth time curve represents the corresponding relationship between the depth and time planned to be reached by the external underwater detection equipment when performing the underwater detection task this time. Since the marine underwater corrosion potential measurement device is carried on the external underwater detection equipment, the dive plan depth time curve also represents the corresponding relationship between the depth and time to be reached in the future for the marine underwater corrosion potential measurement.

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

[0114] In step S103B, the dive plan depth time curve can be divided into multiple curve segments according to the slope of each point on the dive plan depth time curve. The slopes of each point in the same curve segment are in the same interval, while the average slopes of different curve segments vary. Fig. 9 As shown, the dive plan depth time curve is divided into multiple segments corresponding to time periods t1″-t2″, t2″-t3″, t3″-t4″ and t4″-t5″, respectively. The slopes of the points in the curve segment corresponding to the time period t1″-t2″ are in the same interval, so that the slopes of the points in the curve segment are roughly the same, and the curve segment as a whole is in a state of "rapid decline", while the slopes of the points in the curve segment adjacent to it, that is, the curve segment corresponding to the time period t2″-t3″, are also in the same interval, so that the slopes of the points in the curve segment are roughly the same, and the curve segment as a whole is in a state of "maintaining the same depth for a long time".

[0115] In step S104B, according to the size of the slope corresponding to each curve segment (for example, the average value of the absolute value of the slope of each point), the measurement time points are set in the time period corresponding to the curve segment in a positive correlation. For example, for the curve segment in the corresponding time period t1″-t2″, its overall slope is relatively large, so more measurement time points are set in the range of the time period t1″-t2″; and the curve segment in the corresponding time period t2″-t3″ has a relatively small overall slope, so fewer measurement time points are set in 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 point within the time period t1″-t2″. The main control module does not call the measurement module to output the reverse voltage within the time period t1″-t2″, but continues to measure the corrosion potential data at the measurement time point within the time period t1″-t2″, and performs fitting and calibration processing on the corrosion potential data measured at the measurement time point within the time period t1″-t2″; then, when the time point reaches t2″, t2″ belongs to the time point between the time periods corresponding to two adjacent curve segments, that is, the interval time point, the main control module calls the measurement module to output the reverse voltage, so that the working electrode becomes It is in a fresh state, and then after the measurement time points within the time period t2″-t3″, the main control module does not call the measurement module to output the reverse voltage within the time period t2″-t3″, but continues to measure the corrosion potential data at the measurement time points within the time period t2″-t3″, and performs fitting and calibration processing on the corrosion potential data measured at the measurement time points within the time period t2″-t3″; then, when the time point reaches t3″, t3″ also belongs to the interval time point, the main control module calls the measurement module to output the reverse voltage, so that the working electrode becomes a fresh state…Finally, after all the measurement time points, the corresponding corrosion potential data are measured.

[0117] In this embodiment, the principle of executing steps S101B-S104B is that when the marine underwater corrosion potential measuring device is carried on an external underwater detection device, the activity of the marine 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 a detection task itself, and thus needs to dive according to a predetermined plan, such as a dive plan depth-time curve. The external underwater detection device may not stay at a specific depth long enough for the marine underwater corrosion potential measuring device to measure. By executing steps S101B-S104B, the marine underwater corrosion potential measuring device can, during the period of time when the external underwater detection device dives faster, By setting more measurement time points to continuously measure and obtain corrosion potential data, there is no need to depolarize the electrode in the same time period. The corrosion potential data continuously measured in the same time period are filtered and fitted separately, which is beneficial to reduce the measurement error caused by insufficient stay time at a specific depth. In the time period when the external underwater detection equipment dives slowly or maintains a constant depth for a long time, by setting fewer measurement time points, it is beneficial to reduce the measurement frequency of the corrosion potential data while obtaining corrosion potential data with an error that meets the requirements, thereby reducing the impact of the marine underwater corrosion potential measurement on the external underwater detection equipment due to the application of voltage and current or data transmission.

[0118] The marine underwater corrosion potential measurement device in this embodiment can realize corrosion electrochemical measurement of the entire profile at various depths underwater in the ocean, thereby realizing important applications in the following fields:

[0119] Marine engineering: used to detect the corrosion of various facilities in the marine environment, such as offshore oil platforms, crude oil terminals, oil and seawater pipelines, ships, etc. Understand the corrosion rate, corrosion behavior and local corrosion tendency of these facilities at different depths and locations underwater, so as to take effective protective measures, extend the service life of the facilities and ensure their safe operation.

[0120] Metal material research: Study the corrosion patterns and correlations of various metals in different depth zones of the marine environment (such as the atmospheric zone, splash zone, tidal zone, underwater zone and sub-mud zone), as well as the effects of different alloying elements on the corrosion performance of steel grades under different zone conditions.

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

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

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

[0124] Material screening and R&D: In the process of developing new metal materials or anti-corrosion materials, underwater full-section corrosion electrochemical measurement can be used to 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 process and mechanism of underwater metal corrosion to provide theoretical support for the research of corrosion protection methods.

[0126] Underwater structure monitoring: For example, long-term monitoring of underwater structures such as dock steel pipe piles and bridge foundations can be carried out 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 being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature, or it may be indirectly fixed or connected to the other feature. In addition, the descriptions of up, down, left, right, etc. used in the present disclosure are only relative to the relative positional relationship of the components of the present disclosure in the accompanying drawings. The singular forms of "a", "" and "the" used in the present disclosure are also intended to include the plural forms, unless the context clearly indicates other meanings. In addition, unless otherwise defined, all technical and scientific terms used in this embodiment have the same meaning as those generally understood by those skilled in the art. The terms used in the specification of this embodiment are only for describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this embodiment includes any combination of one or more related listed items.

[0128] It should be understood that, although the term first, second, third etc. may be adopted to describe various elements in the present disclosure, these elements should not be limited to these terms. These terms are only used to distinguish the same type of elements from each other. For example, without departing from the scope of the present disclosure, the first element may also be referred to as the second element, and similarly, the second element may also be referred to as the first element. The use of any and all examples or exemplary language ("for example", "such as" etc.) provided by the present embodiment is only intended to better illustrate embodiments of the present invention, and unless otherwise required, the scope of the present invention will not be limited.

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

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

[0131] Further, the method can be implemented in any type of computing platform that is operably connected to a suitable computer, including but not limited to a personal computer, a minicomputer, a mainframe, a workstation, a network or distributed computing environment, a separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, etc. Various aspects of the present invention can be implemented in 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, an optical read and / or write storage medium, a RAM, a ROM, etc., so that it can be read 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 process described herein. In addition, the machine-readable code, or part thereof, can be transmitted via a wired or wireless network. When such media includes instructions or programs that implement the above steps in conjunction with a microprocessor or other data processor, the invention of this embodiment includes these and other different types of non-transitory computer-readable storage media. When programmed according to the methods and techniques of the present invention, the present invention also includes the computer itself.

[0132] The computer program can be applied to input data to perform the functions of the present embodiment, thereby converting the input data to generate output data stored in a 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 present invention, the converted data represents a physical and tangible object, including a specific visual depiction of the physical and tangible object produced on the display.

[0133] The above are only preferred embodiments of the present invention. The present invention is not limited to the above embodiments. As long as the technical effects of the present invention are achieved by the same means, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention. Within the scope of protection of the present invention, its technical solutions and / or implementation methods may have various modifications and changes.

Claims

1. A marine underwater corrosion potential measuring device, characterized in that: The marine underwater corrosion potential measuring device comprises: Real-time clock module; the real-time clock module is used for timing; A measuring module; the measuring module is used to connect to the corrosion test sample; Main control module; the main control module is used to call the measurement module to measure the corrosion test sample to obtain corrosion potential data according to the timing of the real-time clock module; A pressure-resistant casing; the real-time clock module, the measurement module and the main control module are encapsulated in the pressure-resistant casing.

2. The marine underwater corrosion potential measuring device according to claim 1, characterized in that: The marine underwater corrosion potential measuring 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 measuring module and the main control module; The surface of the pressure-resistant shell is provided with an anti-corrosion coating, and the pressure-resistant shell 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 shell, the potential probe is connected to the measurement module via the second watertight interface, and the potential probe is used to hang the corrosion test sample externally; The marine underwater corrosion potential measuring device is used to be carried on external underwater detection equipment.

3. The marine underwater corrosion potential measuring device according to claim 1, characterized in that: The method of calling the measurement module to measure the corrosion test sample to obtain corrosion potential data according to the timing of the real-time clock module includes: When selecting the continuous measurement mode, set the delay time before the measurement starts, the measurement time interval and the number of measurement data points; Determining whether the delay time before the start of the measurement has passed according to the timing of the real-time clock module; When the delay time before the start of the measurement has passed, judging whether the measurement time interval has passed according to the timing of the real-time clock module; Each time the measurement time interval passes, the measurement module is called to measure the corrosion test sample, a corresponding corrosion potential data is obtained, and the number of measurements is recorded; When the cumulative number of measurements reaches the number of measurement data points, the measurement process is stopped.

4. The marine underwater corrosion potential measuring device according to claim 1, characterized in that: The method of calling the measurement module to measure the corrosion test sample to obtain corrosion potential data according to the timing of the real-time clock module includes: When selecting to execute the real-time measurement mode, set at least one measurement time point; Determining whether the measurement time point has been reached according to the timing of the real-time clock module; When the measurement time point is reached, the measurement module is called to measure the corrosion test sample to obtain corresponding corrosion potential data.

5. The marine underwater corrosion potential measuring device according to claim 3 or 4, characterized in that: The main control module is also used to call the measurement module to output a reverse voltage before calling the measurement module to measure the corrosion test sample each time, and the main control module is also used to perform filter fitting calibration processing on each of the corrosion potential data obtained by measurement.

6. The marine underwater corrosion potential measuring device according to claim 4, characterized in that: The setting of at least one measurement time point comprises: Obtaining a planned diving depth-time curve of an external underwater detection device carried by the marine underwater corrosion potential measuring device; Obtaining the slope of each position on the depth-time curve of the dive plan; Segmenting the dive plan depth-time curve according to the slope to obtain a plurality of 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 the set measurement time points is positively correlated with the slope corresponding to the curve segment.

7. The marine underwater corrosion potential measuring device according to claim 6, characterized in that: The main control module is also used to perform filtering, fitting and calibration processing on each of the corrosion potential data measured at each measurement time point corresponding to each of the curve segments; 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.

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