In-situ electrochemical monitoring experimental device for simulating corrosion of ocean tidal range zone

Abstract

The utility model provides an in-situ electrochemical monitoring experimental device for simulating corrosion of an ocean tidal range zone, which comprises a water storage tank, an experimental water tank, a first water pipe, a first flow meter, a first diaphragm pump, a second water pipe, a second flow meter, a second diaphragm pump, a sample fixing frame and an electrochemical test fixing frame for mounting a plurality of electrochemical probes for simulating different tide levels, the two ends of the first water pipe are connected with the water storage tank and the experiment water tank in a one-to-one correspondence mode, the two ends of the second water pipe are connected with the water storage tank and the experiment water tank in a one-to-one correspondence mode, and the first flow meter and the first diaphragm pump are installed on the first water pipe. The first flow meter and the first diaphragm pump are installed on the first water pipe, the second flow meter and the second diaphragm pump are installed on the second water pipe, the sample fixing frame is installed in the experiment water tank, the electrochemical test fixing frame is installed in the experiment water tank in a sliding mode, and the sample fixing frame is located on the motion trail of the electrochemical test fixing frame.

Description

TECHNICAL FIELD

[0001] The utility model relates to material corrosion technical field especially relates to a simulation in situ electrochemistry monitoring experiment device of marine tidal difference area corrosion. BACKGROUND

[0002] With the continuous development and utilization of marine resources, the basic framework used in marine industry development is composed of steel structure or reinforced concrete structure, which will face serious corrosion problems in marine environment. When steel corrosion occurs, not only the building itself is destroyed, the service life is shortened, and the resources are wasted, but also sudden disaster accidents caused by corrosion are caused.

[0003] Seawater is a strong electrolyte solution, and marine environment is a very complex specific corrosion environment. From the perspective of corrosion, marine environment can be divided into five zones, namely marine atmospheric zone, splash zone, marine tidal zone, seawater immersion zone and seabed soil zone. The corrosion damage processes of different corrosion zones are different. Among them, the tidal zone refers to the area between the average low tide level and the average high tide level. The corrosion environment for unprotected metal components is extremely harsh. The steel structure in this area is periodically wetted by seawater and is always in a dry-wet alternating state. In addition, oxygen supply is sufficient, temperature difference and wave impact, as well as the effect of salt concentration on the sample surface after seawater retreat, often make the protective measures fail, resulting in serious corrosion, greatly reducing the bearing capacity of the whole steel structure and affecting the normal safe use, and shortening the service life of the steel structure.

[0004] The existing marine environment simulation device mainly focuses on the corrosion weight loss of the hanging piece of the material. Although the weight loss method has the advantages of true condition and reliable result, the disadvantage is that only the average corrosion rate can be obtained, and the corrosion mechanism and the rapid evolution law of the corrosion process with time cannot be explained. Electrochemical measurement can obtain in-situ, dynamic and continuous corrosion data during exposure, which is of great significance to the study of corrosion mechanism. Therefore, it is urgent to develop an electrochemical test device that can simulate the corrosion process of tidal difference. UTILITY MODEL CONTENT

[0005] The utility model solves the technical problems in the prior art and provides an in-situ electrochemical monitoring experiment device for simulating corrosion in a marine tidal difference area.

[0006] The utility model discloses a technical scheme that solves the above technical problems: a kind of in-situ electrochemical monitoring experimental device of simulating marine tidal range area corrosion, comprising: water storage tank, experimental water tank, first water pipe, first flowmeter, first diaphragm pump, second water pipe, second flowmeter, second diaphragm pump, sample fixing frame, electrochemical test fixing frame for installing multiple simulation different tidal level electrochemical probes, the both ends of the first water pipe are connected with the water storage tank and the experimental water tank one by one, the both ends of the second water pipe are connected with the water storage tank and the experimental water tank one by one, the first flowmeter and the first diaphragm pump are installed on the first water pipe, the second flowmeter and the second diaphragm pump are installed on the second water pipe, the sample fixing frame is installed in the experimental water tank, the electrochemical test fixing frame is slidably installed in the experimental water tank, and the sample fixing frame is located on the movement track of the electrochemical test fixing frame.

[0007] The beneficial effects of the technical scheme of the utility model are as follows: all water pipes can be used as water inlet pipes and water outlet pipes, are connected with diaphragm pumps respectively, flowmeters are installed on each water pipe to control water speed, half-day tide or full-day tide is realized, water flow rate is accurately controlled by flowmeter, diaphragm pump continuously works, half-day tide and full-day tide time requirements can be met respectively, and real seawater fluctuation law is simulated. By moving electrochemical probe, test time interval is set, probe touches sample surface during testing, leaves sample surface after testing, sample surface is not affected, and in-situ monitoring is realized. Electrochemical research on metal corrosion behavior in simulated tidal difference environment is realized, and the utility model is suitable for electrochemical research on intertidal zone corrosion caused by seawater height difference.

[0008] Further, the experimental water tank is provided with a slide, the electrochemical test fixing frame is slidably installed in the slide, and the sample fixing frame is located on the slide.

[0009] The beneficial effects of the above further technical scheme are as follows: the installation and maintenance of the electrochemical test fixing frame and the sample fixing frame are facilitated, and the electrochemical test fixing frame drives the electrochemical probe to slide to abut against the sample on the sample fixing frame.

[0010] Further, the electrochemical test fixing frame is connected with a stepping motor.

[0011] The beneficial effects of the above further technical scheme are as follows: the slide is installed on the upper portion of the experimental water tank, the sample fixing frame can be fixed, long and short samples can be placed, and the stepping motor installed on the slide can control the forward and backward movement of the electrochemical probe.

[0012] Further, the electrochemical test fixture is provided with a highest tide level electrochemical probe fixing position rack, a middle tide level electrochemical probe fixing position rack, a middle-low tide level electrochemical probe fixing position rack and a lowest tide level electrochemical probe fixing position rack, which are located on the side of the electrochemical test fixture adjacent to the sample fixing rack.

[0013] The above further technical solution has the beneficial effect of facilitating the testing of more tide level points.

[0014] Further, the highest tide level electrochemical probe fixing position rack, the middle tide level electrochemical probe fixing position rack, the middle-low tide level electrochemical probe fixing position rack and the lowest tide level electrochemical probe fixing position rack are sequentially arranged from top to bottom along the axis direction of the electrochemical test fixture.

[0015] The above further technical solution has the beneficial effect of only contacting the sample surface during testing, and can increase the fixing positions to realize the testing of more tide level points. When the testing is completed, the probe can leave the sample surface to ensure that the sample surface is not disturbed by the probe and the real corrosion process of the sample is not affected.

[0016] Further, the highest tide level electrochemical probe fixing position rack, the middle tide level electrochemical probe fixing position rack, the middle-low tide level electrochemical probe fixing position rack and the lowest tide level electrochemical probe fixing position rack are sequentially arranged from top to bottom along the axis direction of the electrochemical test fixture.

[0017] The above further technical solution has the beneficial effect of facilitating the testing of more tide level points.

[0018] Further, the electrochemical probe comprises a sponge probe, a wooden plug, a simulated seawater solution, a salt bridge, a saturated calomel electrode, a saturated potassium chloride solution and a valve, the simulated seawater solution is connected with a pipeline, the valve is installed on the pipeline, the sponge probe and the wooden plug are installed on the free end of the pipeline, the simulated seawater solution is connected with the saturated potassium chloride solution through the salt bridge, and the saturated calomel electrode is installed in the saturated potassium chloride solution.

[0019] The above further technical solution has the beneficial effect of facilitating the testing of more tide level points.

[0020] Further, the experimental water tank is provided with a seawater solution, and the sample fixing rack is provided with a to-be-tested piece.

[0021] The beneficial effects of the further technical scheme are that the experimental water tank can fix various specifications of the test pieces on the test piece fixing frame to keep stable, and the electrochemical in-situ monitoring is performed, so that the test system is stable.

[0022] Further, the test piece is a long test piece and a short test piece.

[0023] The beneficial effects of the further technical scheme are that the experimental water tank can fix various specifications of the test pieces on the test piece fixing frame to keep stable, and the electrochemical in-situ monitoring is performed, so that the test system is stable.

[0024] Further, the two ends of the first water pipe are located at the bottom of the water storage tank and the bottom of the experimental water tank respectively, and the two ends of the second water pipe are located at the bottom of the water storage tank and the bottom of the experimental water tank respectively.

[0025] The beneficial effects of the further technical scheme are that the seawater circulation between the water storage tank and the experimental water tank is facilitated, and the real seawater fluctuation law is simulated.

[0026] The advantages of the additional aspects of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 The structure schematic view of the in-situ electrochemical monitoring experimental device for simulating the corrosion in the marine tidal difference area is provided for the utility model embodiment.

[0028] Figure 2 The schematic view of the electrochemical test reference electrode is provided for the utility model embodiment.

[0029] Figure 3 The different tidal level electrochemical monitoring results of the experimental water tank are provided for the utility model embodiment.

[0030] The number of the drawing is explained: 1, the water storage tank; 2, the experimental water tank; 3, the first water pipe; 4, the first flowmeter; 5, the first diaphragm pump; 6, the second water pipe; 7, the second flowmeter; 8, the second diaphragm pump; 9, the slide; 10, the test piece fixing frame; 11, the step motor; 12, the electrochemical test fixing frame; 14, the highest tidal level electrochemical probe fixing position frame; 15, the middle tidal level electrochemical probe fixing position frame; 16, the middle-low tidal level electrochemical probe fixing position frame; 17, the lowest tidal level electrochemical probe fixing position frame; 18, the sponge probe; 19, the wooden plug; 20, the simulated seawater solution; 21, the salt bridge; 22, the saturated calomel electrode; 23, the saturated potassium chloride solution; 24, the valve. DETAILED DESCRIPTION

[0031] The principles and characteristics of the utility model are described below in combination with the drawings, and the examples are only used to explain the utility model and not to limit the scope of the utility model.

[0032] As shown in Figure 1 and Figure 2 The utility model discloses an in-situ electrochemical monitoring experiment device for simulating marine tidal difference area corrosion, which comprises a water storage tank 1, an experimental water tank 2, a first water pipe 3, a first flowmeter 4, a first diaphragm pump 5, a second water pipe 6, a second flowmeter 7, a second diaphragm pump 8, a sample fixing frame 10, an electrochemical test fixing frame 12 for mounting a plurality of simulated different tide level electrochemical probes, the two ends of the first water pipe 3 are connected with the water storage tank 1 and the experimental water tank 2 one by one, the two ends of the second water pipe 6 are connected with the water storage tank 1 and the experimental water tank 2 one by one, the first flowmeter 4 and the first diaphragm pump 5 are installed on the first water pipe 3, the second flowmeter 7 and the second diaphragm pump 8 are installed on the second water pipe 6, the sample fixing frame 10 is installed in the experimental water tank 2, the electrochemical test fixing frame 12 is slidingly installed in the experimental water tank 2, and the sample fixing frame 10 is located on the movement track of the electrochemical test fixing frame 12.

[0033] The utility model discloses the beneficial effects of the technical scheme are as follows: all water pipes can be used as water inlet pipes and water outlet pipes, and are respectively connected with diaphragm pumps, flowmeters are installed on each water pipe to control water speed, and half-day or whole-day tides are realized. The diaphragm pumps can continuously work by accurately controlling water flow rate through the flowmeters, and the requirements of half-day tides and whole-day tides can be met, and the real seawater rise and fall rules are simulated. The electrochemical probes are moved, test time intervals are set, the probes lightly touch the sample surface during testing, and the probes leave the sample surface after testing, so that the sample surface is not affected, and in-situ monitoring is realized. The electrochemical research on metal corrosion behavior in the simulated tidal difference environment is realized, and the electrochemical research on the corrosion of the intertidal zone caused by the height difference of seawater is suitable.

[0034] The readings of the first flowmeter and the second flowmeter can be manually read, and the first diaphragm pump and the second diaphragm pump can be manually started and stopped. The electrochemical test fixing frame 12 can be manually pushed. The time can be manually counted.

[0035] As an alternative to the manual mode, the manual mode can be changed to an automatic mode by the person skilled in the art according to actual needs, the first flow meter, the first diaphragm pump, the second flow meter, the second diaphragm pump, the stepping motor, the electrochemical probe and the valve can be connected to the controller, and a timer can be arranged in the controller. The automatic control of each component is realized through the controller. It should be noted that the control method of the controller for automatic timing, reading the flow meter, starting and stopping the diaphragm pump, starting and stopping the stepping motor, reading the electrochemical probe and starting and stopping the valve is prior art, and the person skilled in the art can easily think of programming the controller to realize the corresponding automatic control function according to actual needs.

[0036] The utility model embodiment provides a kind of in-situ electrochemical monitoring experimental device of simulating marine tidal difference area corrosion, can be in-situ electrochemical experimental device of metal corrosion in marine tidal difference area, realize the electrochemical research of metal corrosion behavior in simulated tidal difference environment.The device mainly includes an experimental tank (experimental water tank 2), a water storage tank 1, two diaphragm pumps (first diaphragm pump and second diaphragm pump), two flow meters (first flow meter and second flow meter), a stepping motor 11, electrochemical test probe (electrochemical probe) and water pipe.The flow rate of water is accurately controlled by flow meter, so that submersible pump (diaphragm pump) works continuously, can meet the half-day tide and full-day tide time requirement respectively, to simulate the real seawater fluctuation law.The electrochemical probe is moved by stepping motor, and the test time interval is set, the probe is lightly touched on the surface of sample (test piece / sample) during testing, and the probe is away from the surface of sample after testing, so that the surface of sample is not affected, and in-situ automatic monitoring is realized.The utility model can automatically realize the regular change of seawater fluctuation and in-situ automatic acquisition of electrochemical data (acquisition method is prior art, and details are not repeated here), and the test result is accurate and reliable, the sample is not affected, the simulated environment is real, and it is suitable for electrochemical research of intertidal zone corrosion caused by seawater height difference.

[0037] The utility model embodiment provides a kind of in-situ electrochemical monitoring experimental device of simulating marine tidal difference area corrosion, can be in-situ electrochemical experimental device of metal corrosion in marine tidal difference area, realize the electrochemical research of metal corrosion behavior in simulated tidal difference environment.The device mainly includes an experimental tank (experimental water tank 2), a water storage tank 1, two diaphragm pumps (first diaphragm pump and second diaphragm pump), two flow meters (first flow meter and second flow meter), a stepping motor 11, electrochemical test probe (electrochemical probe) and water pipe.The flow rate of water is accurately controlled by flow meter, so that submersible pump (diaphragm pump) works continuously, can meet the half-day tide and full-day tide time requirement respectively, to simulate the real seawater fluctuation law.The electrochemical probe is moved by stepping motor, and the test time interval is set, the probe is lightly touched on the surface of sample (test piece / sample) during testing, and the probe is away from the surface of sample after testing, so that the surface of sample is not affected, and in-situ automatic monitoring is realized.The utility model can automatically realize the regular change of seawater fluctuation and in-situ automatic acquisition of electrochemical data (acquisition method is prior art, and details are not repeated here), and the test result is accurate and reliable, the sample is not affected, the simulated environment is real, and it is suitable for electrochemical research of intertidal zone corrosion caused by seawater height difference.

[0038] The size specification of water storage tank 1 and experimental water tank 2 can be adjusted according to the simulated tidal level.

[0039] Experimental water tank 2 can fix various specifications of test piece on test piece fixing frame 10 to keep stable, and test piece includes long and short test pieces, to carry out in-situ electrochemical monitoring and make test system stable.

[0040] The electrochemical probe only contacts the sample surface during testing, and a fixed position can be added to achieve automatic testing of more tide points. When the testing is completed, the probe (electrochemical probe) can automatically leave the sample surface, ensuring that the sample surface is not disturbed by the probe and affecting the real corrosion process of the sample.

[0041] All water pipes can be used as water inlet pipes and water outlet pipes, and are respectively connected with diaphragm pumps. A flow meter is installed on each water pipe to control the water speed, realizing half-day or full-day tide.

[0042] Through the diaphragm pump and the flow meter, the seawater flow rate is accurately controlled to realize full-automatic tide level control.

[0043] As shown in Figure 1 and Figure 2 Further, the experimental water tank 2 is provided with a slide 9, the electrochemical test fixing frame 12 is slidingly installed in the slide 9, and the sample fixing frame 10 is located on the slide 9.

[0044] The beneficial effects of the above further technical solutions are: facilitating the installation and maintenance of the electrochemical test fixing frame and the sample fixing frame, and facilitating the sliding of the electrochemical test fixing frame to abut against the sample on the sample fixing frame.

[0045] As shown in Figure 1 and Figure 2 Further, the electrochemical test fixing frame 12 is connected with a stepping motor 11.

[0046] The beneficial effects of the above further technical solutions are: installing a slide on the upper part of the experimental water tank, fixing the sample fixing frame, and placing long and short samples. At the same time, the stepping motor installed on the slide can control the forward and backward movement of the electrochemical probe.

[0047] The stepping motor can be connected with the electrochemical test fixing frame through a screw rod transmission mechanism and a gear and rack transmission mechanism.

[0048] As shown in Figure 1 and Figure 2 Further, the electrochemical test fixing frame 12 is provided with a highest tide level electrochemical probe fixed position frame 14, a middle tide level electrochemical probe fixed position frame 15, a middle-low tide level electrochemical probe fixed position frame 16, and a lowest tide level electrochemical probe fixed position frame 17. The highest tide level electrochemical probe fixed position frame 14, the middle tide level electrochemical probe fixed position frame 15, the middle-low tide level electrochemical probe fixed position frame 16, and the lowest tide level electrochemical probe fixed position frame 17 are located on the side of the electrochemical test fixing frame 12 adjacent to the sample fixing frame 10.

[0049] The beneficial effect of the further technical scheme is that more tide points can be tested conveniently.

[0050] As shown in Figure 1 and Figure 2 Further, the highest tide level electrochemical probe fixed position rack 14, the middle tide level electrochemical probe fixed position rack 15, the middle-low tide level electrochemical probe fixed position rack 16 and the lowest tide level electrochemical probe fixed position rack 17 are sequentially arranged from top to bottom along the axial direction of the electrochemical test fixed rack 12.

[0051] The beneficial effect of the further technical scheme is that the electrochemical probe only contacts the sample surface during testing, and the fixed position can be increased to realize testing of more tide points. When the testing is completed, the probe can leave the sample surface, so that the sample surface is not disturbed by the probe and the real corrosion process of the sample is not affected.

[0052] As shown in Figure 1 and Figure 2 Further, the highest tide level electrochemical probe fixed position rack 14, the middle tide level electrochemical probe fixed position rack 15, the middle-low tide level electrochemical probe fixed position rack 16 and the lowest tide level electrochemical probe fixed position rack 17 are sequentially arranged from top to bottom along the axial direction of the electrochemical test fixed rack 12.

[0053] The beneficial effect of the further technical scheme is that more tide points can be tested.

[0054] As shown in Figure 1 and Figure 2 Further, the electrochemical probe comprises a sponge probe 18, a wooden plug 19, a simulated seawater solution 20, a salt bridge 21, a saturated calomel electrode 22, a saturated potassium chloride solution 23 and a valve 24. The simulated seawater solution 20 is connected with a pipeline, the valve 24 is installed on the pipeline, the sponge probe 18 and the wooden plug 19 are installed on the free end of the pipeline, the simulated seawater solution 20 is connected with the saturated potassium chloride solution 23 through the salt bridge 21, and the saturated calomel electrode 22 is installed in the saturated potassium chloride solution 23.

[0055] The beneficial effect of the further technical scheme is that more tide points can be tested conveniently.

[0056] As shown in Figure 1 and Figure 2 Further, the experimental water tank 2 is provided with a seawater solution, and the sample fixed rack 10 is provided with a test piece.

[0057] The beneficial effect of the further technical scheme is that the experimental water tank can fix various specifications of the test pieces on the test piece fixing frame to keep stable, and the electrochemical in-situ monitoring is performed, so that the test system is stable.

[0058] Further, the test piece is a long-size test piece and a short-size test piece.

[0059] The beneficial effect of the further technical scheme is that the experimental water tank can fix various specifications of the test pieces on the test piece fixing frame to keep stable, and the electrochemical in-situ monitoring is performed, so that the test system is stable.

[0060] Further, the two ends of the first water pipe 3 are located at the bottom of the water storage tank 1 and the bottom of the experimental water tank 2 respectively, and the two ends of the second water pipe 6 are located at the bottom of the water storage tank 1 and the bottom of the experimental water tank 2 respectively.

[0061] The beneficial effect of the further technical scheme is that the seawater circulation between the water storage tank and the experimental water tank is facilitated, and the real seawater fluctuation law is simulated.

[0062] The in-situ electrochemical monitoring experimental device for simulating corrosion in a marine tidal zone provided by the embodiment of the utility model can be accurately simulated in the marine tidal process, various tidal level changes can be simulated, and in-situ electrochemical testing of a test piece can be performed, and the device is simple to operate and can be placed indoors. The device can solve the problems that a test piece is easily lost in the open sea, is affected by multiple environmental interferences, and a real reason for corrosion of a material in a tidal zone is difficult to explain, and can realize electrochemical in-situ monitoring research of multiple size components.

[0063] The in-situ electrochemical monitoring experimental device for simulating corrosion in a marine tidal zone provided by the embodiment of the utility model comprises a water storage tank 1 and an experimental water tank 2, and two water tanks (the water storage tank 1 and the experimental water tank 2) are completely independent, and automatic tidal water fluctuation is realized through two sets of waterway systems. Each set of waterway is composed of a water pipe, a diaphragm pump and a flow meter, wherein the two water pipes are respectively inserted into the bottom of the respective water tanks, the flow meter can control the water flow speed, and the tidal level is accurately controlled. A slide 9 is installed on the upper portion of the experimental tank (the experimental water tank 2), a test piece frame (a test piece fixing frame 10) can be fixed, and long-size and short-size test pieces can be placed. Meanwhile, a stepping motor 11 installed on the slide can control the forward and backward movement of an electrochemical test probe (an electrochemical probe).

[0064] The utility model has the advantages and positive effects that:

[0065] 1. The test results are authentic and reliable. This invention can realistically simulate the corrosion environment of the ocean tidal zone, and has a good correspondence with the actual corrosion environment of the tidal zone. It saves the manpower, material resources and financial resources required to conduct experiments in the actual ocean tidal zone, and solves the problems of sample loss caused by complex and changeable environment, difficulty in realizing in-situ electrochemical testing and personnel operation safety, while ensuring the integrity of the obtained data and the authenticity and reliability of the test results.

[0066] 2. Samples are easy to install and observe. This utility model device can be used indoors in a fixed location. By simulating the tidal range variation, it enables in-situ monitoring and research of electrochemical corrosion of materials under this environment, avoiding the difficulties in installation and timely in-situ testing of material corrosion status in actual marine environments.

[0067] 3. Simulates diverse tidal level changes. This invention can simulate various tidal level changes in actual marine environments, including semi-diurnal and diurnal tides, and can also be used to study the corrosion patterns of irregular tidal level changes in certain characteristic sea areas.

[0068] like Figure 1 As shown, this embodiment of the invention includes an experimental water tank 2 for in-situ monitoring of electrochemical samples. Before the experiment begins, the tide rise and fall times are set, and then the prepared seawater solution is injected into the experimental water tank 2 until the highest tide line is reached. Then, the first diaphragm pump 5 is started, and the first flow meter 4 is adjusted to control the flow rate, injecting seawater from the first water pipe 3 into the water storage tank 1 at a stable speed according to the preset time. When the water level in the experimental water tank 2 reaches the lowest tide level, the first diaphragm pump 5 stops working. This process simulates the ebb tide. Simultaneously, the second diaphragm pump 8 starts working, and the second flow meter 7 is adjusted to control the set flow rate, injecting seawater from the second water pipe 6 into the experimental water tank 2 at a stable speed according to the preset time. When the seawater solution in the experimental water tank 2 rises to the highest tide line, the second diaphragm pump 8 automatically stops working. This process simulates the rising tide. Completing one ebb and rise tide cycle represents experiencing one tide rise and fall. This cycle is repeated to automatically simulate the rise and fall of seawater in the tidal zone. A schematic diagram of the reference electrode used in this electrochemical test is shown below. Figure 2 As shown, it can be used as an electrochemical probe. Before the test, adjust valve 24 to ensure that the surface of the sponge probe 18 is always wet, but without any droplets flowing out. When the test starts, the preset stepper motor working time controls the electrochemical probe to move to the sample surface. After the test is completed, the electrochemical probe is returned to its original position.

[0069] Verification of the accuracy of test results:

[0070] like Figure 3 As shown, Figure 3 In this context, Height represents the tidal level in cm, Ecorr represents the corrosion potential in V, and t represents time in hours.

[0071] The potential test results corresponding to the tidal level change curve during the two tidal range processes in 24 hours, positions 1-4 correspond to four monitoring positions, respectively representing the highest tidal level, the middle tidal level, the middle-low tidal level and the lowest tidal level. It can be seen from the potential change results that the potential values are different at different positions, the closer to the low tide area, the lower the potential, and the closer to the high tide area, the higher the potential value. At the same time, with the increase of the tidal level, at positions 1-3, when the test position is submerged by seawater, the potential gradually decreases; when the test position is exposed to the water surface, with the decrease of the tidal level, the potential gradually increases, and then decreases again when the test position is submerged by seawater again, and the cycle is repeated. The potential of position 4 at the lowest tidal level does not change with the change of the tidal level. This means that the materials at different parts of the tidal range area will be corroded to different degrees due to different environmental effects, which is also the fundamental reason why the test sample is most severely corroded in the middle tidal area, followed by the low tidal area, the highest tidal area close to the atmospheric area is corroded slower than the tidal range area, and the lowest tidal area close to the fully immersed area is corroded the slowest. Although there is a certain difference between the indoor simulated tidal height and the actual marine tidal height, the corrosion change regularity is basically the same after being reduced in proportion in the indoor simulated seawater tidal range fluctuation environment in the experimental device of the utility model, which proves the reliability and accuracy of the utility model, and the importance of the utility model for the corrosion research of materials in the tidal range area.

[0072] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, but not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. An in-situ electrochemical monitoring experimental device for simulating corrosion in marine tidal zones, characterized in that, include: The system includes a water storage tank, an experimental water tank, a first water pipe, a first flow meter, a first diaphragm pump, a second water pipe, a second flow meter, a second diaphragm pump, a sample holder, and an electrochemical testing holder for mounting multiple electrochemical probes simulating different tidal levels. Both ends of the first water pipe are connected to the water storage tank and the experimental water tank, and both ends of the second water pipe are also connected to the water storage tank and the experimental water tank. The first flow meter and the first diaphragm pump are mounted on the first water pipe, and the second flow meter and the second diaphragm pump are mounted on the second water pipe. The sample holder is installed in the experimental water tank, and the electrochemical testing holder is slidably mounted in the experimental water tank, with the sample holder positioned on the trajectory of the electrochemical testing holder.

2. The in-situ electrochemical monitoring experimental device for simulating corrosion in marine tidal zones according to claim 1, characterized in that, The experimental water tank is equipped with a slide, the electrochemical test fixture is slidably installed in the slide, and the sample fixture is located on the slide.

3. The in-situ electrochemical monitoring experimental device for simulating corrosion in marine tidal zones according to claim 2, characterized in that, The electrochemical test fixture is connected to a stepper motor.

4. The in-situ electrochemical monitoring experimental device for simulating corrosion in marine tidal zones according to claim 1, characterized in that, The electrochemical testing fixture is equipped with a highest tide level electrochemical probe fixing position holder, a middle tide level electrochemical probe fixing position holder, a middle-low tide level electrochemical probe fixing position holder, and a lowest tide level electrochemical probe fixing position holder. The highest tide level electrochemical probe fixing position holder, the middle tide level electrochemical probe fixing position holder, the middle-low tide level electrochemical probe fixing position holder, and the lowest tide level electrochemical probe fixing position holder are all located on the side of the electrochemical testing fixture adjacent to the sample fixing fixture.

5. The in-situ electrochemical monitoring experimental device for simulating corrosion in marine tidal zones according to claim 4, characterized in that, The electrochemical probe fixing frame at the highest tide level, the electrochemical probe fixing frame at the middle tide level, the electrochemical probe fixing frame at the middle and low tide levels, and the electrochemical probe fixing frame at the lowest tide level are arranged sequentially from top to bottom along the axial direction of the electrochemical test fixing frame.

6. The in-situ electrochemical monitoring experimental device for simulating corrosion in marine tidal zones according to claim 4, characterized in that, Electrochemical probes are installed on the highest tide level electrochemical probe fixing frame, the middle tide level electrochemical probe fixing frame, the middle and low tide level electrochemical probe fixing frame, and the lowest tide level electrochemical probe fixing frame.

7. The in-situ electrochemical monitoring experimental device for simulating corrosion in marine tidal zones according to claim 6, characterized in that, The electrochemical probe includes: a sponge probe, a cork, a simulated seawater solution, a salt bridge, a saturated calomel electrode, a saturated potassium chloride solution, and a valve. The simulated seawater solution is connected to a pipeline, the valve is installed on the pipeline, the sponge probe and the cork are installed at the free end of the pipeline, the simulated seawater solution is connected to the saturated potassium chloride solution through the salt bridge, and the saturated calomel electrode is installed in the saturated potassium chloride solution.

8. The in-situ electrochemical monitoring experimental device for simulating corrosion in marine tidal zones according to claim 1, characterized in that, The experimental water tank contains seawater solution, and the sample holder holds the test piece.

9. The in-situ electrochemical monitoring experimental device for simulating corrosion in marine tidal zones according to claim 8, characterized in that, The test pieces are long ruler test pieces and short ruler test pieces.

10. The in-situ electrochemical monitoring experimental device for simulating corrosion in marine tidal zones according to claim 1, characterized in that, The two ends of the first water pipe are located at the bottom of the water storage tank and the bottom of the experimental water tank, respectively, and the two ends of the second water pipe are located at the bottom of the water storage tank and the bottom of the experimental water tank, respectively.

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