A test device and method for testing the corrosion resistance of a specimen in a simulated dry-wet alternating environment

Abstract

The present invention belongs to the technical field of corrosion experiments in dry-wet alternating environments, and proposes a device and method for testing the corrosion resistance of a specimen in a simulated dry-wet alternating environment, comprising a platform, an air chamber and a test bench arranged on one side of the platform, and a ventilation duct arranged on the other side of the platform; the test bench is used to place a specimen to be tested; the ventilation duct is connected to the air chamber, and the air chamber is arranged with an opening at one end away from the platform; the entire device is floated in the on-site seawater through the platform, and the positions of the air chamber and the test bench in the seawater are changed by inflating and deflating the air chamber through the ventilation duct, so as to achieve adjustment of the specimen to be tested placed in the test bench in the seawater, and on the basis of achieving on-site tests, multiple tests such as different liquid level tests can be achieved by adjusting the amount of gas in the air chamber, so as to better study the corrosion of the PHC pipe pile waiting to be tested in the splash zone.

Description

Technical Field

[0001] The invention belongs to the technical field of corrosion experiments in dry-wet alternating environments, and in particular relates to a device and method for testing the corrosion resistance of a specimen in a simulated dry-wet alternating environment. Background Art

[0002] Photovoltaic power generation + salt industry brine production is a new project integration development model, so the anti-corrosion problem faced by PHC piles as the foundation of photovoltaic brackets in brine pools is also a new topic. The main corrosion factors in the brine pool environment are chloride ions and sulfate ions. Since the concrete structure itself is alkaline, acidic water erosion will cause a sharp deterioration of the physical properties of the concrete, while accelerating the corrosion rate of steel bars, seriously affecting the durability of the concrete project.

[0003] The corrosion of PHC piles in the splash zone is much greater than the destructive corrosion of PHC piles in the submerged zone and the atmospheric zone. This is because in the splash zone environment, the surface of the PHC piles will repeatedly experience dry and wet states. This periodic change will cause serious corrosion to the PHC piles. The corrosion environment in the splash zone is similar to the dry-wet alternating environment, so the dry-wet alternating experiment is often used to simulate the corrosion process in the splash zone.

[0004] The inventors found that in the prior art, most dry-wet alternating experiments are carried out in the laboratory to simulate the field environment. Although the dry-wet alternating environment can be simulated, the temperature, air pressure, humidity and brine composition on site are constantly changing, and there are also the influence of accidental factors, which cannot be achieved through indoor experimental simulation. Summary of the invention

[0005] In order to solve the above problems, the present invention proposes a test device and method for the corrosion resistance of specimens in a simulated dry-wet alternating environment, which can realize on-site tests, better study the corrosion of specimens such as PHC pipe piles in the splash zone, and realize multiple tests such as fixed liquid level tests.

[0006] In order to achieve the above-mentioned object, in the first aspect, the present invention provides a test device for the corrosion resistance of a specimen in a simulated dry-wet alternating environment, which adopts the following technical scheme:

[0007] A test device for the corrosion resistance of a specimen in a simulated dry-wet alternating environment, comprising a platform, an air chamber and a test bench arranged on one side of the platform, and a ventilation duct arranged on the other side of the platform; the test bench is used to place the specimen to be tested;

[0008] The ventilation duct is connected to the air cabin, and the air cabin is opened at one end away from the platform. The entire device is floated in the on-site seawater through the platform, and the air cabin is inflated and deflated through the ventilation duct to change the positions of the air cabin and the test bench in the seawater, thereby achieving adjustment of the test pieces placed in the test bench in the seawater.

[0009] Furthermore, a ruler is fixed on the inner wall of the air chamber 7, a slide groove is provided on the surface of the ruler, two sliders are provided on the slide groove, and the two sliders are respectively provided with a first water level sensor and a second water level sensor.

[0010] Furthermore, one side of the ventilation duct is connected to a fan via a one-way valve.

[0011] Furthermore, the upper pipe opening of the ventilation duct is sealed and connected to the outside through a through hole; a baffle is arranged above the through hole, and a slot is opened on the baffle, and the width of the slot is equal to the diameter of the through hole; a motor is arranged at one end of the ventilation duct away from the platform, and the baffle is connected to the output shaft of the motor.

[0012] Furthermore, a fixture is provided on the ventilation duct, the fixture is sleeve-shaped, the fixture is fixed to the ventilation duct via threads, and the motor is fixed inside the fixture.

[0013] Furthermore, a limiting column is arranged on the ventilation duct at a side away from the platform, and the limiting column passes through the slot hole, and the slot hole is an arc-shaped slot hole.

[0014] Furthermore, a controller is provided on the platform, and a gateway and an antenna are provided on the controller through a guide rail buckle.

[0015] In order to achieve the above-mentioned purpose, in a second aspect, the present invention also provides a method for testing the corrosion resistance of a specimen in a simulated dry-wet alternating environment, which adopts the following technical scheme:

[0016] A method for testing the anti-corrosion performance of a specimen in a simulated dry-wet alternating environment adopts the device for testing the anti-corrosion performance of a specimen in a simulated dry-wet alternating environment as described in the first aspect, comprising: using the platform to float the entire device in the on-site seawater, inflating and deflating the air chamber through the ventilation duct, changing the positions of the air chamber and the test bench in the seawater, and realizing the adjustment of the test piece placed in the test bench in the seawater.

[0017] Furthermore, if the first water level sensor and the second water level sensor do not sense water, the motor starts to work, causing the baffle to rotate counterclockwise, the through hole and the slot hole are connected, so that the air chamber is connected to the outside world, and under the action of gravity, the air in the air chamber is discharged, and the entire device begins to descend; when the second water level sensor senses water, the motor rotates clockwise, and the baffle rotates clockwise to block the through hole;

[0018] If the first water level sensor does not sense water, but the second water level sensor senses water and reaches the specified depth, the fan starts to work, the air chamber supplies air to discharge the water, and the device starts to rise. When the second water level sensor senses water, the fan stops working;

[0019] If both the first water level sensor and the second water level sensor sense water, the fan starts working, sending air to the air chamber to discharge the water, and the device starts to rise. When the second water level sensor senses water, the fan stops working.

[0020] Furthermore, a fixed liquid level test is performed; if the second water level sensor does not sense water, the motor starts to work, causing the baffle to rotate counterclockwise, the slot hole is connected to the through hole, and the air chamber is connected to the outside world. Under the action of gravity, the air in the air chamber is discharged, and the entire device begins to descend; when the second water level sensor senses water, the motor rotates clockwise, and the baffle rotates clockwise to block the through hole;

[0021] If the second water level sensor senses water, the fan starts to work, the air chamber supplies air to discharge the water, and the device starts to rise. When the second water level sensor just senses water, the fan stops working;

[0022] At this time, the device is in a state where the second water level sensor just senses water, and remains suspended in this state.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The device in the present invention includes a platform, an air cabin and a test bench arranged on one side of the platform, and a ventilation duct arranged on the other side of the platform; the test bench is used to place the test piece; the ventilation duct is connected to the air cabin, and the air cabin is opened at one end away from the platform; the whole device is floated in the on-site seawater through the platform, and the air cabin is inflated and deflated through the ventilation duct to change the positions of the air cabin and the test bench in the seawater, so as to achieve the adjustment of the test sample placed in the test bench in the seawater. On the basis of achieving on-site tests, multiple tests such as different liquid level tests can be achieved by adjusting the amount of gas in the air cabin, so as to better study the corrosion of the test sample in the splash zone.

[0025] The present invention utilizes a remote PLC control system. By using the remote PLC control system, technicians can monitor and control the automatic adjustment device that simulates the alternating dry and wet environment through the Internet at any location; by using the remote PLC control system, the need for on-site monitoring equipment and personnel can be reduced, thereby reducing travel and labor costs; in addition, remote monitoring also helps to identify and solve problems earlier, reducing expensive equipment downtime and maintenance costs; the remote PLC control system can collect a large amount of data, including equipment performance indicators and maintenance logs. These data can be used for further analysis to optimize equipment performance and develop more effective maintenance strategies.

[0026] The main function of the fixing device in the present invention is to keep the test device for the corrosion resistance of the specimen in the simulated dry-wet alternating environment stable at the desired position to prevent drifting due to wind, water flow or other external factors. By effectively using the anchor, the test device for the corrosion resistance of the specimen in the simulated dry-wet alternating environment can avoid dangerous areas such as shoals, reefs or other potential collision obstacles that affect its operation. In an emergency, the anchor can also be used as a temporary safety measure until it is repaired.

[0027] The invention has the advantages of simple structure, convenient operation and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings in the specification that constitute a part of this embodiment are used to provide a further understanding of this embodiment. The schematic embodiments of this embodiment and their descriptions are used to explain this embodiment and do not constitute improper limitations on this embodiment.

[0029] Figure 1 This is a schematic diagram of the principle of realizing the floating of the test device for corrosion resistance of a specimen in a simulated dry-wet alternating environment according to Example 1 of the present invention;

[0030] Figure 2 This is a schematic diagram of a device according to Embodiment 1 of the present invention;

[0031] Figure 3 is a cross-sectional view of a device according to Embodiment 1 of the present invention;

[0032] Figure 4 It is a partial cross-sectional view of the upper part of the ventilation duct according to Embodiment 1 of the present invention;

[0033] Figure 5 This is a schematic diagram of exhaust from a ventilation duct according to Embodiment 1 of the present invention;

[0034] Figure 6 This is a schematic diagram of air supply from a fan according to Embodiment 1 of the present invention;

[0035] Figure 7 This is a flow chart of the dry-wet alternating test of Example 1 of the present invention;

[0036] Figure 8 This is a flow chart of a fixed liquid level test according to Example 1 of the present invention;

[0037] Among them, 100, platform; 1, motor; 101, fixture; 102, baffle; 103, thread; 104, limit column; 105, through hole; 106, slot; 2, ventilation duct; 3, fan; 4, controller; 5, power supply; 6, laboratory table; 7, air chamber; 701, scale; 702, first water level sensor; 703, second water level sensor; 8, anchor chain; 9, anchor; 10, one-way valve. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0039] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0040] Embodiment 1:

[0041] Photovoltaic power generation + salt industry brine production is a new project integration development model, so the anti-corrosion problem faced by PHC piles as the foundation of photovoltaic brackets in brine pools is also a new topic. The main corrosion factors in the brine pool environment are chloride ions and sulfate ions. Since the concrete structure itself is alkaline, acidic water erosion will cause a sharp deterioration of the physical properties of the concrete, while accelerating the corrosion rate of steel bars, seriously affecting the durability of the concrete project.

[0042] PHC piles form three corrosion environments in brine environment, namely atmospheric zone, splash zone and submerged zone. Among them, the corrosion of PHC piles in splash zone is much greater than the destructive corrosion of PHC piles in submerged zone and atmospheric zone. The corrosion of PHC piles in splash zone is the most serious because the surface of PHC piles will repeatedly experience dry and wet states in the splash zone environment. This periodic change will cause serious corrosion to PHC piles. The corrosion environment in splash zone is similar to the dry-wet alternating environment, so dry-wet alternating experiment is often used to simulate the corrosion process in splash zone.

[0043] Existing technologies show that most dry-wet alternation experiments are conducted in the laboratory to simulate the on-site environment. Although it is possible to simulate the dry-wet alternation environment, and even the existing technology can achieve multiple sets of parallel experiments at a time, precise temperature control, temperature adjustment, pressure control, and humidity control to restore the studied environment, the temperature, air pressure, humidity, and brine composition in the field are constantly changing, and there are also accidental factors that affect them, which cannot be simulated in indoor experiments.

[0044] In response to the above problems, Figure 1 As shown, this embodiment provides a test device for the corrosion resistance of test pieces in a simulated dry-wet alternating environment, which can realize on-site tests, avoid the constant changes in temperature, air pressure, humidity, and brine composition on site, and the influence of other accidental factors on the experiment, and can better study the corrosion of PHC pipe piles in the splash zone, and can realize multiple tests such as fixed liquid level tests.

[0045] The device in this embodiment can also be automated without manual operation, and the remote PHC control system can be used to control the device. Through different control processes, not only dry-wet alternating tests but also fixed liquid level tests and other tests can be performed.

[0046] like Figure 1 and Figure 2 As shown, optionally, the device and the air chamber 7 are first considered as a whole, and its gravity is G, F 空气 is the atmospheric pressure, and the water pressure difference is ρghs. The force analysis is carried out with the second water surface as the research object. The vertical downward atmospheric pressure F 空气 and gravity G, and the second water surface is subject to the vertical upward water pressure difference ρghs and atmospheric pressure F 空气 , because the device floats on the water surface, according to the equilibrium condition, the resultant force is zero. The analysis shows that the gravity G is equal to the water pressure difference ρghs, so that the test device for the corrosion resistance of the specimen in the simulated dry-wet alternating environment floats on the water surface.

[0047] The whole dry-wet alternating process is as follows. First, air is introduced into the air chamber 7. Since the gravity of the device acts on the air, as the volume of air increases, the air can only push the second water surface downward to move, generating a water pressure difference until the water pressure difference increases to be equal to the gravity of the device. Since the gravity remains unchanged, the water pressure difference will no longer increase, and the liquid level difference h remains unchanged. During this process, the device does not rise. When air continues to be introduced into the air chamber, since the liquid level difference h remains unchanged, the air can only push the device upward, so the device is raised above the water surface. When the air is discharged from the air chamber, due to the decrease in air volume and air pressure, the device begins to descend under the action of gravity, and the second water surface begins to rise. In this embodiment, the sea level is taken as the first water surface, the first water surface is referred to as water surface 1, and the second water surface is referred to as water surface 2.

[0048] In this embodiment, the device mainly includes a platform 100, a buoyancy system (air cabin, fan, ventilation duct, motor, power supply, test bench), a remote PLC control system (PLC, gateway, antenna, guide rail buckle) and a fixing device (anchor, anchor chain), etc. Figure 2 and Figure 3As shown, the buoyancy system includes an air chamber 7 arranged on the platform 100, a motor 1 connected to the air chamber 7 through a ventilation duct 2, a fan 3 connected to the ventilation duct 2, a one-way valve arranged between the fan 3 and the ventilation duct 2, a power supply 5 arranged on the platform 100, and a test bench 6 arranged on the platform 100; the remote PLC control system includes a controller 4, a gateway, an antenna and a guide rail clip arranged on the platform 100; the fixing device includes an anchor 9, and an anchor chain 8 connected to the anchor 9, and the anchor chain 8 is used to connect the anchor 9 and the platform 100.

[0049] In some embodiments, Figure 3 As shown, in the buoyancy system, the platform 100 is a circular platform, which is divided into two parts, upper and lower, with the circular platform as the center. An air chamber 7 with a size of 300mm×300mm×300mm is set at the center position of the lower part of the circular platform by bolt connection or welding. When air enters the air chamber, the air will discharge the water in the air chamber downward, thereby generating a water pressure difference to provide upward buoyancy for the entire device. A ruler 701 with a measuring range of 300mm is vertically fixed on the inner wall of the air chamber 7 by bolt connection or welding. Optionally, the upper surface of the ruler 701 has a slide groove for placing two sliders, and the two sliders are respectively provided with a first water level sensor 702 and a second water level sensor 703; the first water level sensor 702 is called water level sensor No. 1, and the second water level sensor 703 is called water level sensor No. 2.

[0050] The central position of the upper part of the circular platform is connected to the ventilation duct 2, and the ventilation duct 2, the circular platform and the air cabin 7 are in communication. A one-way valve 10 is arranged on the right side of the ventilation duct 2, and the one-way valve 10 is a one-way air stop valve. Optionally, the one-way air stop valve includes components such as a valve flap and a spring, and air can pass through when it flows from right to left, but not vice versa. The right end of the one-way air stop valve is connected to the fan 3, and the fan 3 blows air, and the air enters the ventilation duct 2 through the one-way air stop valve, and then enters the air cabin 7.

[0051] like Figure 4 As shown, optionally, the upper pipe opening of the ventilation duct 2 is sealed and connected to the outside through a through hole 105, and a baffle 102 is covered above the through hole 105. A slot 106 is opened on the baffle 102, and the width of the slot 106 is equal to the diameter of the through hole 105; the baffle 102 is connected to the output shaft of the motor 1, and when the motor 1 is working, the baffle 102 rotates counterclockwise to make a part of the slot 106 coincide with the through hole 105, so as to realize the exhaust of the air cabin, conversely, the baffle 102 rotates clockwise, and the baffle 102 blocks the through hole 105 to prevent air leakage.

[0052] like Figure 4 As shown, the upper part of the motor 1 is covered with a fixture 101, the fixture 101 is sleeve-shaped, and the fixture 101 is fixed to the ventilation duct 2 through a thread 103 to prevent the motor 1 from rotating and moving up and down. On the ventilation duct 2, a limiting column 104 is arranged on the side away from the platform 100, and the limiting column 104 passes through the slot 106, and the slot 106 is an arc-shaped slot. The setting of the limiting column 104 limits the rotation distance of the slot 106, thereby improving the control stability.

[0053] like Figure 1 As shown, two test benches 6 are arranged symmetrically on both sides of the circular platform for placing PHC pile samples, and the test benches 6 include sleeves, nuts, etc. The power supply 5 provides power for all power devices, controllers or other devices requiring electrical energy in the device.

[0054] In some embodiments, the remote PLC control system includes a controller 4, a gateway, an antenna, and a guide rail buckle, etc. The controller 4 can be a PLC. When working, first put the PLC on the platform 100, fix the gateway on the PLC by means of a guide rail buckle, etc., fix the antenna on the PLC, the fan 3, the motor 1, the first water level sensor 702, and the second water level sensor 703, etc., are connected to the PLC through wires, the gateway is connected to the PLC through wires, the antenna is connected to the gateway, and the PLC is connected to the power supply 5.

[0055] The remote PLC control system can realize different functions of the automatic regulating device for simulating the alternating dry and wet environment as required. Optionally, the required program can be written on the computer first, and then downloaded to the PHC.

[0056] In some embodiments, when performing a dry-wet alternating test, firstly, a dry-wet alternating test program is written on a computer, and then the program is downloaded to the PHC, the program is started, the system initialization is first completed, the initial value of the variable is set, and each module is self-checked, and an alarm is given and the machine is shut down if there is a fault; if there is no fault, the next command is entered, and the PLC reads the status of the first water level sensor 702 and the second water level sensor 703. There are three states:

[0057] Working condition 1: if the first water level sensor 702 and the second water level sensor 703 do not sense water, the motor 1 starts to work, causing the baffle 102 to rotate counterclockwise, and the through hole 105 and a part of the slot 106 overlap and connect, so that the air chamber 7 is connected to the outside. Under the action of gravity, the air in the air chamber 7 is discharged, and the whole device starts to descend. Figure 5 When the second water level sensor 703 just senses water, the motor 1 rotates clockwise, and the blocking piece 102 rotates clockwise to block the through hole 105. The gas cannot be discharged at this time, and the device stops descending and floats on the water surface.

[0058] Working condition 2: if the first water level sensor 702 does not sense water, but the second water level sensor 703 senses water and reaches the specified depth, scheme 2 is executed, the fan 3 starts to work, the air chamber 7 supplies air to discharge the water, and the device starts to rise. When the second water level sensor 703 just senses water, the fan 3 stops working. Figure 6 shown.

[0059] Working condition three, if the first water level sensor 702 and the second water level sensor 703 both sense water, plan two is executed, the fan 3 starts to work, sends air to the air chamber 7 to discharge the water, and the device starts to rise. When the second water level sensor 703 just senses water, the fan 3 stops working.

[0060] In some embodiments, Figure 7 As shown, when the first water level sensor 702 does not sense water, but the second water level sensor 703 is just in the state of sensing water, it stays in this state for 48 minutes to simulate a dry state. After 48 minutes, the PHC reads the number of dry-wet alternating cycles. If the number of cycles required is met, the device stops working and an alarm is given. If the number of cycles required is not met, the third solution is implemented, the fan 3 starts working, and air is sent to the air chamber 7 to discharge the water. The device starts to rise. When the first water level sensor 702 senses water, the fan 3 stops working and stays in this state for 12 minutes to simulate an immersion state. After 12 minutes, the motor 1 starts to work, causing the baffle 102 to rotate counterclockwise. The slot 106 of the baffle 102 overlaps and communicates with the through hole 105, so that the air chamber 7 is connected to the outside world. Under the action of gravity, the air in the air chamber 7 is discharged, and the entire device begins to descend. At the same time, the PLC reads the status of the first water level sensor 702 and the second water level sensor 703. When the second water level sensor 703 cannot sense water within 1 minute, the device starts to alarm for failure. When the second water level sensor 703 senses water within 1 minute, the motor 1 rotates clockwise, and the baffle 102 rotates clockwise to block the through hole 105. The gas cannot be discharged at this time, and the device stops descending and floats on the water surface. One cycle ends, and then enters the main control cycle, which is continuously executed according to the scanning cycle (60 minutes).

[0061] In some embodiments, Figure 8As shown, a fixed liquid level test is performed; first, a fixed liquid level test program is written on the computer, and then the program is downloaded to the PHC, and the program is started. First, the system initialization is completed, the initial value of the variable is set, and each module is self-checked. If there is a fault, an alarm is given and the machine is shut down; if there is no fault, the next command is entered, and the PLC reads the state of the second water level sensor 703. There are two states:

[0062] Working condition 1: if the second water level sensor 703 does not sense water. Execution scheme 1: the motor 1 starts to work, causing the baffle 102 to rotate counterclockwise, and the slot 106 of the baffle 102 overlaps and communicates with the through hole 105, so that the air chamber 7 is connected to the outside. Under the action of gravity, the air in the air chamber 7 is discharged, and the entire device begins to descend. Figure 5 As shown, when the second water level sensor 703 just senses water, the motor 1 rotates clockwise, and the blocking piece 102 rotates clockwise to block the through hole 105. The gas cannot be discharged at this time, and the device stops descending and floats on the water surface.

[0063] Working condition 2: if the second water level sensor 703 senses water, the second solution is executed, the fan 3 starts to work, the air chamber 7 supplies air to discharge the water, and the device starts to rise. When the second water level sensor 703 just senses water, the fan 3 stops working. Figure 6 shown.

[0064] At this time, the device is in a state where the second water level sensor 703 just senses water, and remains suspended in this state. The PHC continuously reads the state of the second water level sensor 703 and executes the program in a loop.

[0065] Optionally, the remote PLC control system usage process is as follows:

[0066] Connect the gateway to the IoT platform, install the virtual network tool, and connect the gateway to the computer.

[0067] Create a virtual interface on the computer to send and receive data.

[0068] Log in to the virtual network tool account in the software, find and add the gateway device, select the download port and configure the communication parameters. In the configuration interface, the serial port parameter settings need to be consistent with the actual PLC parameter settings.

[0069] Click [Start Connection] and the gateway enters download mode, download the program to the PLC, and use the software on the computer to remotely download and debug the PLC.

[0070] Monitor the program, observe the operating status of the PLC, create device drivers on the IoT platform, add variables, alarms, etc.

[0071] Draw the configuration screen and realize remote control on mobile phones, computers, and tablets.

[0072] In some embodiments, the fixing device includes an anchor 9 and an anchor chain 8. When in use, one end of the anchor chain 8 is fixed to the anchor handle, and the other end is fixed to the device, such as the platform 100. First, the ship should face the direction of the wind or tide and slowly sail to the predetermined anchor point. After reaching the designated position, the ship is placed in a stationary state, and a suitable anchor chain length is selected according to the water depth, usually three to five times the water depth. Then, the anchor chain 8 is gradually released, and the anchor 9 is slowly dropped to the bottom of the water to fix the device and prevent the test device for the corrosion resistance of the specimen in the simulated dry-wet alternating environment from drifting to the shore and affecting its normal operation.

[0073] Embodiment 2:

[0074] In order to illustrate Example 1, this embodiment provides a test device for the corrosion resistance of a specimen in a simulated dry-wet alternating environment, which is an automatic adjustment device that simulates a dry-wet alternating environment. The test method of the present invention is introduced based on the field test of the anti-corrosion of a pipe pile foundation in a brine environment of a saline-alkali tidal flat. According to the requirements of the relevant specifications for the dry-wet alternating experiment, the dry-wet alternating process is specified as follows: the dry state lasts for 48 minutes, the immersion state lasts for 12 minutes, which constitutes one dry-wet cycle, and the test cycle is 120 times.

[0075] S1. Sample selection and sampling:

[0076] Optionally, in this embodiment, the test piece is a concrete cylinder with a size of Φ150mm×200mm. First, two concrete cylinders are made according to the concrete specimen production standard, and then cured for 28 days under a standard environment. The anti-corrosion coating is applied to the concrete cylinder according to the standard painting method.

[0077] S2. Assembly of test equipment:

[0078] Optionally, start assembling the automatic adjustment device for simulating the alternating dry-wet environment. First, install the test bench 6 of the device. According to the height of the concrete cylinder, roughly adjust the depth of the test bench 6 to facilitate the placement of the concrete cylinder in the test bench. Then, according to the height of the concrete cylinder of 200mm, adjust the relative positions of the first water level sensor 702 and the second water level sensor 703 in the air chamber so that the distance between the two sensors is 200mm. Secondly, according to the total gravity of the test device for the corrosion resistance of the specimen and the concrete cylinder in the simulated alternating dry-wet environment, establish the balance condition of total gravity and buoyancy, and calculate the approximate water depth of the device, so as to roughly determine the position of the first water level sensor 702 and the second water level sensor 703 in the air chamber 7. Then turn on the power switch, connect the fan 3, the motor 1 and the remote PHC operating system to the power supply 5, and detect whether various instruments are working properly. Finally, install the fixing device, fix one end of the anchor chain on the anchor handle, and fix the other end on the test device for the corrosion resistance of the specimen in the simulated alternating dry-wet environment.

[0079] S3. Test method:

[0080] First, place the test device for the corrosion resistance of the specimen in a simulated dry-wet alternating environment on a horizontal plane, place the two concrete cylinders in the center of the two test benches 6 respectively, turn on the mobile phone and other tools, log in to the Internet of Things platform, connect to the gateway, check the PHC status, and perform the self-test procedure to ensure that the remote PHC operating system is working properly.

[0081] Next, the researchers took a small boat to select a suitable water area, considering the influence of water depth, bottom quality (sand, mud or clay bottom is preferred), tide and wind direction to ensure the safety of the selected area and stay away from waterways and obstacles. Therefore, the boat should face the direction of the wind or tide and slowly sail to the predetermined anchor point. After arriving at the designated location, the boat is placed in a stationary state, and the test device for the anti-corrosion performance of the specimen in a simulated dry-wet alternating environment is placed on the water surface. According to the water depth, the appropriate length of the anchor chain 8 is selected, usually three to five times the water depth, and then the anchor chain 8 is gradually released to allow the anchor 9 to slowly fall to the bottom of the water. After the anchor contacts the seabed, gently reverse to help the anchor fix, observe the tension of the anchor chain 8 and the position of the test device for the anti-corrosion performance of the specimen in the simulated dry-wet alternating environment, ensure that the anchor is firmly fixed to the bottom, and prevent the test device for the anti-corrosion performance of the specimen in the simulated dry-wet alternating environment from drifting to the shore and affecting its normal operation.

[0082] S4, dry and wet alternating test:

[0083] Use a mobile phone to remotely control the PLC. Before starting, write a program in advance. First, complete the system initialization, set the initial value of the variable, and self-check each module. If there is a fault, alarm and shut down; if there is no fault, enter the next command, and the PLC reads the working conditions of the first water level sensor 702 and the second water level sensor 703. There are three working conditions as follows.

[0084] Working condition 1: when the first water level sensor 702 does not sense water, but the second water level sensor 703 is in the state of sensing water, it stays in this state for 48 minutes to simulate a dry state. After 48 minutes, the PHC reads the number of dry-wet alternating cycles. If the number of cycles required is met, the device stops working and an alarm is issued. If the number of cycles required is not met, plan 3 is executed, the fan 3 starts working, and air is sent to the air chamber 7 to drain the water. The device starts to rise. When the first water level sensor 702 senses water, the fan 3 stops working and stays in this state for 12 minutes to simulate an immersion state. After 12 minutes, the motor 1 starts to work, causing the baffle 102 to rotate counterclockwise, and the slot 106 of the baffle 102 overlaps and communicates with the through hole 105, so that the air chamber 7 is connected to the outside world. Under the action of gravity, the air in the air chamber 7 is discharged, and the entire device begins to descend. At the same time, the PLC reads the status of the first water level sensor 702 and the second water level sensor 703. When the second water level sensor 703 cannot sense water within one minute, the device starts to alarm for failure. When the second water level sensor 703 senses water within 1 minute, the motor 1 rotates clockwise, and the baffle 102 rotates clockwise to block the through hole 105. The gas cannot be discharged at this time, and the device stops descending and floats on the water surface. One cycle ends, and then enters the main control cycle, which is continuously executed according to the scanning cycle (60 minutes).

[0085] S5, fixed liquid level test:

[0086] Use a mobile phone to remotely control the PLC. Before starting, write a program in advance. First, complete the system initialization, set the initial value of the variable, and self-check each module. If there is a fault, an alarm will be given and the machine will be shut down. If there is no fault, enter the next command. The PLC reads the working condition of the No. 2 water level sensor. There are two working conditions as follows.

[0087] Working condition 1: if the second water level sensor 703 does not sense water, the motor 1 starts to work, causing the baffle 102 to rotate counterclockwise, and the slot 106 of the baffle coincides with the through hole 105, so that the air chamber 7 is connected to the outside world. Under the action of gravity, the air in the air chamber 7 is discharged, and the entire device begins to descend. When the second water level sensor 703 just senses water, the motor 1 rotates clockwise, and the baffle 102 rotates clockwise to block the through hole 105. The gas cannot be discharged at this time, and the device stops descending and floats on the water surface.

[0088] Working condition two, if the second water level sensor 703 senses water, plan two is executed, the fan 3 starts working, the air chamber 7 supplies air to discharge the water, and the device starts to rise. When the second water level sensor 703 just senses water, the fan 3 stops working.

[0089] At this time, the device is in a state where the second water level sensor 703 just senses water, and remains suspended in this state. The PHC continuously reads the state of the second water level sensor 703 and executes the program in a loop.

[0090] S6. End of test:

[0091] After the test, the researchers drove the boat to the side of the test device for the corrosion resistance of the specimens in a simulated dry-wet alternating environment, placed the device in the boat and turned off the power, removed the two concrete cylinders and placed them in a box, opened the connection between the device and the anchor chain, slowly tightened the anchor chain, gradually brought the boat closer to the anchor point, slowly lifted the anchor until it completely left the bottom of the water, placed the anchor and anchor chain in the boat, then drove the boat back to the shore, and finally cleaned the test device for the corrosion resistance of the specimens in a simulated dry-wet alternating environment, and put it in the warehouse after checking that there were no problems.

[0092] Most dry-wet alternating experiments are conducted in the laboratory to simulate the field environment. The dry-wet alternating conditions in the laboratory often cannot completely replicate the complex and changeable conditions in the natural environment. For example, humidity changes in the natural environment may be accompanied by changes in multiple environmental factors such as temperature, pressure, and light, and laboratory settings can often only simulate a limited number of these factors. This embodiment implements field tests, taking into account more influencing factors, and the test is more reliable.

[0093] Embodiment 3:

[0094] The present embodiment provides a method for testing the corrosion resistance of a specimen in a simulated dry-wet alternating environment, and adopts the device for testing the corrosion resistance of a specimen in a simulated dry-wet alternating environment as described in Example 1, including: using the platform to float the entire device in the on-site seawater, inflating and deflating the air chamber through the ventilation duct, changing the positions of the air chamber and the test bench in the seawater, and realizing the adjustment of the test piece placed in the test bench in the seawater.

[0095] In some embodiments, if the first water level sensor and the second water level sensor do not sense water, the motor starts to work, causing the baffle to rotate counterclockwise, the through hole and the slot hole are connected, so that the air chamber is connected to the outside, and under the action of gravity, the air in the air chamber is discharged, and the entire device begins to descend; when the second water level sensor senses water, the motor rotates clockwise, and the baffle rotates clockwise to block the through hole;

[0096] If the first water level sensor does not sense water, but the second water level sensor senses water and reaches the specified depth, the fan starts to work, the air chamber supplies air to discharge the water, and the device starts to rise. When the second water level sensor senses water, the fan stops working;

[0097] If both the first water level sensor and the second water level sensor sense water, the fan starts working, sending air to the air chamber to discharge the water, and the device starts to rise. When the second water level sensor senses water, the fan stops working.

[0098] In some embodiments, a fixed liquid level test is performed; if the second water level sensor does not sense water, the motor starts to work, causing the baffle to rotate counterclockwise, the slot hole is connected to the through hole, so that the air chamber is connected to the outside, and under the action of gravity, the air in the air chamber is discharged, and the entire device begins to descend; when the second water level sensor senses water, the motor rotates clockwise, and the baffle rotates clockwise to block the through hole;

[0099] If the second water level sensor senses water, the fan starts to work, the air chamber supplies air to discharge the water, and the device starts to rise. When the second water level sensor just senses water, the fan stops working;

[0100] At this time, the device is in a state where the second water level sensor just senses water, and remains suspended in this state.

[0101] The above description is only a preferred embodiment of the present embodiment and is not intended to limit the present embodiment. For those skilled in the art, the present embodiment may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present embodiment shall be included in the protection scope of the present embodiment.

Claims

1. A test device for the corrosion resistance of a specimen in a simulated dry-wet alternating environment, characterized in that: It comprises a platform, an air cabin and a test bench arranged on one side of the platform, and a ventilation duct arranged on the other side of the platform; the test bench is used to place the test piece; The ventilation duct is connected to the air cabin, and the air cabin is opened at one end away from the platform; the entire device is floated in the on-site seawater through the platform, and the air cabin is inflated and deflated through the ventilation duct to change the position of the air cabin and the test bench in the seawater, thereby realizing the adjustment of the test piece placed in the test bench in the seawater; A ruler is fixed on the inner wall of the air cabin, a slide groove is provided on the surface of the ruler, two slide blocks are provided on the slide groove, and the two slide blocks are respectively provided with a first water level sensor and a second water level sensor; a fan is connected to one side of the ventilation duct through a one-way valve; the upper duct opening of the ventilation duct is sealed and connected to the outside through a through hole; a baffle is provided above the through hole, a slot hole is opened on the baffle, and the width of the slot hole is equal to the diameter of the through hole; a motor is provided at one end of the ventilation duct away from the platform, and the baffle is connected to the output shaft of the motor; If the first water level sensor and the second water level sensor do not sense water, the motor starts to work, causing the baffle to rotate counterclockwise, connecting the through hole and the slot hole, so that the air chamber is connected to the outside world. Under the action of gravity, the air in the air chamber is discharged, and the entire device begins to descend; when the second water level sensor senses water, the motor rotates clockwise, and the baffle rotates clockwise to block the through hole; If the first water level sensor does not sense water, but the second water level sensor senses water and reaches the specified depth, the fan starts to work, the air chamber supplies air to discharge the water, and the device starts to rise. When the second water level sensor senses water, the fan stops working; If both the first water level sensor and the second water level sensor sense water, the fan starts working, sending air to the air chamber to discharge the water, and the device starts to rise. When the second water level sensor senses water, the fan stops working.

2. A test device for the corrosion resistance of a specimen in a simulated dry-wet alternating environment as claimed in claim 1, characterized in that: The ventilation duct is provided with a fixture, the fixture is sleeve-shaped, the fixture is fixed to the ventilation duct via threads, and the motor is fixed inside the fixture.

3. The device for testing the corrosion resistance of a specimen in a simulated dry-wet alternating environment as claimed in claim 1, characterized in that: A limiting column is arranged on the ventilation duct at a side away from the platform, and the limiting column passes through the slot hole, which is an arc-shaped slot hole.

4. The device for testing the corrosion resistance of a specimen in a simulated dry-wet alternating environment as claimed in claim 1, characterized in that: The platform is provided with a controller, on which a gateway and an antenna are provided through a guide rail buckle; the platform is provided with a fixing device, which includes an anchor chain and an anchor.

5. A method for testing the corrosion resistance of a specimen in a simulated dry-wet alternating environment, characterized in that: A method and device for testing the corrosion resistance of test pieces in a simulated dry-wet alternating environment as described in any one of claims 1 to 4 is adopted, comprising: floating the entire device in the on-site seawater through the platform, inflating and deflating the air chamber through the ventilation duct, changing the positions of the air chamber and the test bench in the seawater, and realizing the adjustment of the test pieces placed in the test bench in the seawater.

6. A method for testing the corrosion resistance of a specimen in a simulated dry-wet alternating environment as claimed in claim 5, characterized in that: Perform a fixed liquid level test; if the second water level sensor does not sense water, the motor starts to work, causing the baffle to rotate counterclockwise, the slot hole is connected to the through hole, and the air chamber is connected to the outside world. Under the action of gravity, the air in the air chamber is discharged, and the entire device begins to descend; when the second water level sensor senses water, the motor rotates clockwise, and the baffle rotates clockwise to block the through hole; If the second water level sensor senses water, the fan starts working, the air chamber supplies air to discharge the water, and the device starts to rise. When the second water level sensor just senses water, the fan stops working; at this time, the device is in the state where the second water level sensor just senses water, and remains suspended in this state.

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