Device and method for testing corrosion of steel bar in soil

Abstract

The invention discloses a corrosion test device and method for a steel bar in soil, and belongs to the technical field of material corrosion and protection. The corrosion test device and method for the steel bar in the soil comprise a cylinder body and further comprise a box body used for containing the soil, and a plurality of first through holes are formed in the side wall of the box body; the isolation cloth is used for preventing the soil in the box body from leaking out of the first through hole; the semipermeable membrane is used for isolating the soil from the salt solution, and chloride ions in the salt solution can penetrate through the semipermeable membrane; the cathode material block is arranged in the salt solution; a positive electrode of the power supply module is electrically connected with a steel bar buried in soil in the box body, and the power supply module is used for applying current to the steel bar; and the half-cell potential detection system is connected with the steel bar and is used for detecting the corrosion potential of the steel bar. According to the device and the method for testing the corrosion of the steel bar in the soil, electrochemical accelerated corrosion is combined, the process, the result and the influence factors of metal corrosion can be quantified, and the accuracy and the reliability of detection are improved.

Description

Technical Field

[0001] The invention relates to the technical field of material corrosion and protection, and in particular to a device and method for testing corrosion of steel bars in soil. Background Art

[0002] The corrosion of metal materials in soil environments is an important issue that affects the service life of underground metal components. Especially in infrastructure and underground projects, metal corrosion may lead to structural safety hazards. Traditional detection methods are difficult to accurately quantify the corrosion process in soil and are time-consuming. Existing corrosion detection methods, such as electrochemical tests and immersion tests, have been widely used in the study of metal corrosion behavior in laboratory environments. However, these methods are usually unable to accurately simulate the actual corrosion conditions in complex soil environments. The corrosion of metal materials in soil is a common form of damage in underground projects. Compared with corrosion in concrete, the process of soil corrosion is more complicated and is affected by multiple factors such as oxygen diffusion, water content, and electrolyte distribution.

[0003] Traditional electrochemical devices mainly conduct corrosion tests in solution environments, while soil corrosion is significantly different from solution corrosion. Soil has the characteristics of heterogeneity, porosity, and changes in water content. The diffusivity of corrosion factors such as chloride ions and the conductivity of soil will significantly affect the corrosion process. In addition, soil conditions such as pH, oxygen content, and temperature will affect the corrosion rate. The variability of the soil environment causes corrosion to manifest as local corrosion or pitting, especially under conditions of high water content and high chloride ion concentration, which accelerates corrosion and is more difficult to control. Many electrochemical devices and methods are used to simulate solution corrosion, such as accelerating the corrosion of steel bars or other metals in sodium chloride solutions. However, such test devices cannot fully reflect the corrosion characteristics in soil, especially in soil, where the metal surface is not only affected by water and electrolytes, but also by complex factors such as soil particles, resistance, and microorganisms. These influencing factors cannot be fully reproduced by simple solution corrosion tests, so the process, results, and influencing factors of metal corrosion cannot be quantified, resulting in low accuracy and reliability of detection. Summary of the invention

[0004] The purpose of the present invention is to overcome the problems in the prior art and provide a steel rod corrosion test device and method in soil, which can quantify the process, results and influencing factors of metal corrosion, thereby improving the accuracy and reliability of detection.

[0005] The present invention provides a device and method for testing corrosion of steel rods in soil, comprising a cylinder body, the cylinder body being used to contain a salt solution containing chloride ions, and further comprising:

[0006] A box body is arranged in the cylinder body, the box body is used to contain soil, and a side wall of the box body is provided with a plurality of first through holes;

[0007] An isolation cloth is provided between the inner wall of the box and the soil, and is used to prevent the soil in the box from leaking out of the first through hole;

[0008] A semipermeable membrane is provided between the isolation cloth and the soil, and is used to isolate the soil from the salt solution, and the chloride ions in the salt solution can pass through the semipermeable membrane;

[0009] A cathode material block is disposed in the salt solution;

[0010] A power supply module, the positive electrode of which is electrically connected to a steel rod buried in the soil in the box, the negative electrode of which is electrically connected to the cathode material block, and the power supply module is used to apply current to the steel rod;

[0011] A half-cell potential detection system is connected to the steel rod, and the half-cell potential detection system is used to detect the corrosion potential of the steel rod.

[0012] Preferably, the side wall of the box is provided with a guide rail, and a slide plate is slidably connected in the guide rail. The slide plate is fitted with the side wall of the box, and the slide plate is used to block the first through hole. A plurality of second through holes are provided on the slide plate, and one second through hole corresponds to one first through hole. Each first through hole is connected to its corresponding second through hole, and the connectivity between the first through hole and the second through hole can be adjusted by sliding the slide plate.

[0013] Preferably, the skateboard is connected to an adjustment mechanism, which includes a transmission shaft and a chain. The transmission shaft is pivotally connected to the side wall of the box body, a first sprocket is provided on the transmission shaft, and a second sprocket is pivotally connected to the side wall of the box body. The chain is tooth-connected with the first sprocket and the second sprocket, and the chain is connected to the skateboard, and the chain is arranged perpendicular to the guide rail.

[0014] Preferably, the side wall of the box body is pivotally connected with a handwheel, the handwheel is provided with a worm, the transmission shaft is provided with a worm wheel, the worm and the worm wheel are gear-engaged, and a scale is provided on the outer edge of the handwheel.

[0015] Preferably, the isolation cloth is flannel made of a water-absorbent and corrosion-resistant material.

[0016] Preferably, the cathode material block is made of stainless steel.

[0017] Preferably, the material of the semipermeable membrane is polytetrafluoroethylene.

[0018] The present invention also provides a method for conducting a test using the steel rod corrosion test device in soil, which is characterized by comprising the following steps:

[0019] Cut the steel rods to the specified length, clean and polish their surfaces to ensure that the surfaces of the steel rods are smooth;

[0020] Fill the box with the prepared specific soil, and the chloride ion concentration of the salt solution in the cylinder should be adjusted according to the test requirements;

[0021] Control the rate at which chloride ions in the cylinder enter the soil;

[0022] The steel rod is buried in the soil as an anode and is ensured to be in close contact with the soil. The steel rod is electrically connected to the positive electrode of the power supply module through a wire. The cathode material block is electrically connected to the negative electrode of the power supply module as a cathode and is placed in the salt solution in the cylinder to ensure that the current circuit is complete.

[0023] Start the power supply module and set the current density;

[0024] During the test, the corrosion potential of the steel bar is detected by the half-cell potential detection system at regular intervals, and the corrosion potential change curve is recorded to quantitatively analyze the corrosion rate;

[0025] After the test, the steel rods were taken out of the soil and the macroscopic and microscopic corrosion morphology of their surfaces were observed to further analyze the corrosion uniformity, local corrosion phenomenon and pitting corrosion.

[0026] Preferably, before filling the box with the specific soil, the isolation cloth is bonded to the inner wall of the box by corrosion-resistant super glue or industrial double-sided tape. The super glue or industrial double-sided tape will not fall off or fail in a humid and corrosive environment. When bonding the isolation cloth, ensure that the isolation cloth is flat and tightly fitted to the inner wall of the wooden box.

[0027] Preferably, before filling the box with the specific soil, the semipermeable membrane is fixed to the inner side of the isolation cloth by corrosion-resistant strong glue or industrial double-sided tape to ensure that the semipermeable membrane and the isolation cloth are tightly attached.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows: a steel rod corrosion test device in soil of the present invention, by burying a steel rod as an anode in the soil and ensuring that the steel rod is in close contact with the soil, electrically connecting the steel rod to the positive electrode of a power supply module through a wire, and electrically connecting a cathode material block to the negative electrode of the power supply module as a cathode, and placing it in a salt solution in a cylinder to ensure that the current loop is complete, starting the power supply module, and setting the current density. During the test, the corrosion potential of the steel rod is detected by a half-cell potential detection system at regular intervals, and the corrosion potential change curve is recorded to quantitatively analyze the corrosion rate. By simulating the actual environment in the soil and combining electrochemical accelerated corrosion, a steel rod corrosion test device in soil is designed, the traditional detection method is improved, and the process, results and influencing factors of metal corrosion are quantified, thereby improving the accuracy and reliability of the detection.

[0029] When the device adjusts the rate at which chloride ions enter the soil, the sliding plate is used to cause the first through hole on the sliding plate and the second through hole on the box body to be misaligned, thereby causing the connectivity between the first through hole and the second through hole to change, thereby adjusting the rate at which chloride ions pass through the first through hole and the second through hole to enter the soil, thereby achieving precise control of the corrosion rate of the steel rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the present invention;

[0031] Figure 2 It is a schematic diagram of the structure of each component on the box body of the present invention;

[0032] Figure 3 It is a schematic diagram of the structure in the box of the present invention;

[0033] Figure 4 It is a structural schematic diagram of the AA surface of the present invention;

[0034] Figure 5 This is a schematic diagram of chloride ion penetration in the present invention;

[0035] Figure 6 It is a structural schematic diagram of the regulating mechanism of the present invention;

[0036] Figure 7 It is a schematic structural diagram of the BB surface of the present invention.

[0037] Description of reference numerals:

[0038] 101. cylinder body, 102. box body, 103. first through hole, 104. isolation cloth, 105. semipermeable membrane, 106. steel rod, 107. soil, 108. salt solution, 109. chloride ions, 201. guide rail, 202. slide plate, 203. second through hole, 3. adjustment mechanism, 301. transmission shaft, 302. chain, 303. first sprocket, 304. second sprocket, 401. handwheel, 402. worm, 403. worm wheel. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-Figure 7 , the specific implementation of the present invention is described in detail, but it should be understood that the protection scope of the present invention is not limited by the specific implementation. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0040] like Figure 1-Figure 7As shown, the steel rod corrosion test device in soil provided by the present invention comprises a cylinder 101, wherein the cylinder 101 is used to contain a salt solution 108 containing chloride ions, and further comprises: a box 102, an isolation cloth 104, a semipermeable membrane 105, a cathode material block, a power supply module and a half-cell potential detection system, wherein the box 102 is arranged in the cylinder 101, wherein the box 102 is used to contain soil 107, wherein a plurality of first through holes 103 are arranged on the side wall of the box 102; the isolation cloth 104 is arranged between the inner wall of the box 102 and the soil 107, wherein the isolation cloth 104 is used to prevent the soil 107 in the box 102 from entering the first through holes 103 leakage; a semipermeable membrane 105 is arranged between the isolation cloth 104 and the soil 107, and the semipermeable membrane 105 is used to isolate the soil 107 and the salt solution 108, and the chloride ions 109 in the salt solution 108 can pass through the semipermeable membrane 105; a cathode material block is arranged in the salt solution 108; the positive electrode of the power supply module is electrically connected to the steel rod 106 buried in the soil 107 in the box body 102, and the negative electrode of the power supply module is electrically connected to the cathode material block, and the power supply module is used to apply current to the steel rod 106; a half-cell potential detection system is connected to the steel rod 106, and the half-cell potential detection system is used to detect the corrosion potential of the steel rod 106.

[0041] The working principle of the above embodiment is briefly described:

[0042] The box 102 of the device is made of inert materials such as wood to prevent the box 102 from reacting with the salt solution 108. The steel rod 106 (for example, Q235 steel rod 106) is cut to a specified length, and its surface is cleaned and polished to ensure that the surface of the steel rod 106 is smooth to ensure the accuracy of the corrosion test. The flannel 104 is bonded to the inner wall of the box 102 to ensure that the flannel 104 is flat and tightly fitted to the inner wall of the wooden box, and the semipermeable membrane 105 is fixed on the inner side of the flannel 104 to ensure that the semipermeable membrane 105 is tightly fitted to the flannel 104. Use the prepared specific soil 107 to fill the box 102. The concentration of chloride ions 109 in the salt solution 108 in the cylinder 101 should be adjusted according to the test requirements. During the test, the rate at which the chloride ions 109 in the cylinder 101 enter the soil 107 is controlled as needed. The steel rod 106 is buried in the soil 107 as an anode, and it is ensured that the steel rod 106 is in close contact with the soil 107. The steel rod 106 is electrically connected to the positive electrode of the power supply module through a wire, and the cathode material block is electrically connected to the negative electrode of the power supply module as a cathode and placed in the salt solution 108 in the cylinder 101 to ensure that the current loop is complete. Then the power supply module is started and the current density is set. During the test, the corrosion potential of the steel rod 106 is detected by the half-cell potential detection system at regular intervals, and the corrosion potential change curve is recorded to quantitatively analyze the corrosion rate. After the test, the steel rod 106 is taken out of the soil 107, and the corrosion morphology of its surface is observed at the macro and micro levels to further analyze the uniformity of corrosion, local corrosion phenomenon and pitting corrosion.

[0043] The soil steel rod corrosion test device of the present invention can quantify the process, results and influencing factors of metal corrosion by simulating the actual environment in the soil 107 and combining electrochemical accelerated corrosion, thereby improving the accuracy and reliability of detection.

[0044] On the basis of the above embodiment, in order to adjust the rate at which the chloride ions 109 pass through the first through hole 103 and the second through hole 203 and enter the soil 107 , the corrosion rate of the steel rod 106 can be precisely controlled.

[0045] like Figure 1 , Figure 2 and Figure 4-Figure 7 As shown, the side wall of the box body 102 is provided with a guide rail 201, and a slide plate 202 is slidably connected in the guide rail 201. The slide plate 202 is fitted with the side wall of the box body 102, and the slide plate 202 is used to block the first through hole 103. A plurality of second through holes 203 are provided on the slide plate 202, and one second through hole 203 corresponds to one first through hole 103. Each first through hole 103 is connected to the second through hole 203 corresponding to it, and the connectivity between the first through hole 103 and the second through hole 203 can be adjusted by sliding the slide plate 202.

[0046] The side wall of the box 102 is a fixed orifice plate, and the first through hole 103 is set on the fixed orifice plate. The aperture of the first through hole 103 on the fixed orifice plate should be moderate, such as 10mm in diameter. This aperture is designed as the maximum value to define the maximum chloride ion 109 penetration rate, that is, the maximum value when the second through hole 203 on the slide plate 202 corresponds to it one by one; for the distribution of the first through hole 103, holes are evenly punched on the fixed orifice plate on each side, and the distance between multiple first through holes 103 is kept consistent, usually the distance is set to 2 times the aperture, to ensure that the flow of each first through hole 103 does not interfere with each other. For example, when the aperture of the first through hole 103 is 10mm, the center distance between each first through hole 103 can be set to 20mm; the number of the first through holes 103 on each side is planned according to the size of the box 102, and the number of the first through holes 103 should be sufficient to ensure uniform flow of airflow and chloride ions 109.

[0047] A slide plate 202 is installed on the outside or inside of the fixed hole plate, and the degree of overlap between the first through hole 103 and the second through hole 203 is adjusted by sliding the slide plate 202 to change the connectivity between the two. For the aperture of the second through hole 203, the aperture of the second through hole 203 can be slightly smaller than the aperture of the first through hole 103, and can usually be designed to be 5mm to 10mm; the second through hole 203 can be completely aligned with the first through hole 103, maintaining the same distribution and spacing. For example, if the aperture of the first through hole 103 on the fixed hole plate is 10mm and the spacing is 20mm, then the aperture and distribution of the second through hole 203 on the slide plate 202 should also be designed in this way; for the sliding range of the slide plate 202, the slide plate 202 can slide left and right along the guide rail 201, and the sliding range should be designed to completely cover the first through hole 103 on the fixed hole plate, which means that the left and right sliding range of the slide plate 202 should be large enough to at least completely block or completely open the first through hole 103.

[0048] When the device adjusts the rate at which chloride ions 109 enter the soil 107, the sliding plate 202 slides relative to the side wall of the box 102, and the first through hole 103 on the slide plate 202 and the second through hole 203 on the box 102 are misaligned, so that the connectivity between the first through hole 103 and the second through hole 203 changes, thereby adjusting the rate at which chloride ions 109 pass through the first through hole 103 and the second through hole 203 to enter the soil 107, thereby achieving precise control of the corrosion rate of the steel rod 106.

[0049] As a preferred method, Figure 2 , Figure 6 and Figure 7As shown, the slide plate 202 is connected to an adjustment mechanism 3, and the adjustment mechanism 3 includes a transmission shaft 301 and a chain 302. The transmission shaft 301 is pivotally connected to the side wall of the box body 102, and a first sprocket 303 is provided on the transmission shaft 301. The side wall of the box body 102 is pivotally connected to a second sprocket 304, and the chain 302 is tooth-connected with the first sprocket 303 and the second sprocket 304. The chain 302 is connected to the slide plate 202, and the chain 302 is vertically arranged to the guide rail 201. When adjusting the connectivity between the first through hole 103 and the second through hole 203, the transmission shaft 301 can be rotated to drive the first sprocket 303 to rotate. Since the chain 302 is vertically arranged to the guide rail 201, under the drive of the first sprocket 303, the chain 302 drives the slide plate 202 to move along the length direction of the guide rail 201, so that the connectivity between the first through hole 103 and the second through hole 203 can be accurately adjusted to achieve accurate control of the corrosion rate of the steel rod 106.

[0050] As a preferred method, Figure 6 and Figure 7 As shown, the side wall of the box body 102 is pivotally connected with a handwheel 401, a worm 402 is provided on the handwheel 401, a worm wheel 403 is provided on the transmission shaft 301, the worm 402 is geared with the worm wheel 403, and a scale is provided on the outer edge of the handwheel 401. By setting the handwheel 401, the rotation of the handwheel 401 can drive the worm 402 to rotate, and the worm 402 drives the transmission shaft 301 to rotate through the worm wheel 403, thereby driving the slide plate 202 to move along the length direction of the guide rail 201. Since the outer edge of the handwheel 401 is provided with a scale, the angular displacement of the handwheel 401 can be intuitively understood through the scale on the handwheel 401. Combined with the deceleration effect of the worm wheel 403 and the worm 402, the accuracy of the displacement control of the slide plate 202 can be further improved, so that the connectivity between the first through hole 103 and the second through hole 203 can be more accurately adjusted.

[0051] As a preferred solution, Figure 5 As shown, the isolation cloth 104 is a flannel made of a material with good water absorption and corrosion resistance. The isolation cloth 104 should be made of a material with good water absorption and corrosion resistance, such as a synthetic fiber material. Such a material is not easy to corrode or deteriorate in a humid environment and can maintain stable performance for a long time. As a soft material, the flannel can fit tightly to the soil 107, maintain the moisture environment in the soil 107, and prevent the movement or loss of the particles of the soil 107. It can also maintain the cleanliness of the solution without changing the overall experimental environment.

[0052] As a preferred solution, the cathode material block is made of stainless steel, which can prevent the cathode material block from reacting with the salt solution 108 and being corroded, thereby preventing the concentration of the salt solution 108 from changing and affecting the accuracy of the test results.

[0053] As a preferred solution, Figure 5 As shown, polytetrafluoroethylene is selected as the material of the semipermeable membrane 105. The semipermeable membrane 105 should have a high degree of chemical stability and good acid and alkali resistance to ensure that it will not react with chemical substances in the corrosive environment during the experiment. The semipermeable membrane 105 is made of polytetrafluoroethylene PTFE or other polymer materials to prevent the semipermeable membrane 105 from reacting with the solution, and can accurately control the passage rate of ions, making the experimental environment more controllable.

[0054] The present invention also provides a method for conducting a test using the steel rod corrosion test device in soil, comprising the following steps:

[0055] Cut the steel rod 106 to a specified length, and clean and polish the surface of the steel rod 106 to ensure that the surface of the steel rod 106 is smooth;

[0056] Use the prepared specific soil 107 to fill the box 102, and the chloride ion 109 concentration of the salt solution 108 in the cylinder 101 should be adjusted according to the test requirements;

[0057] Controlling the rate at which chloride ions 109 in cylinder 101 enter soil 107;

[0058] The steel rod 106 is buried in the soil 107 as an anode, and the steel rod 106 is ensured to be in close contact with the soil 107. The steel rod 106 is electrically connected to the positive electrode of the power supply module through a wire. The cathode material block is electrically connected to the negative electrode of the power supply module as a cathode, and is placed in the salt solution 108 in the cylinder 101 to ensure that the current circuit is complete;

[0059] Start the power supply module and set the current density;

[0060] During the test, the corrosion potential of the steel rod 106 is detected by a half-cell potential detection system at regular intervals, and the corrosion potential change curve is recorded to quantitatively analyze the corrosion rate;

[0061] After the test, the steel rod 106 is taken out from the soil 107, and the corrosion morphology of its surface is observed at the macroscopic and microscopic levels, and the corrosion uniformity, local corrosion phenomenon and pitting corrosion are further analyzed.

[0062] As a preferred solution, Figure 3 and Figure 5As shown, before the specific soil 107 is filled into the box 102, the isolation cloth 104 is bonded to the inner wall of the box 102 by corrosion-resistant strong glue or industrial double-sided tape, and the strong glue or industrial double-sided tape will not fall off or fail in a humid and corrosive environment. When bonding the isolation cloth 104, ensure that the isolation cloth 104 is flat and tightly fitted to the inner wall of the wooden box. When pasting the isolation cloth 104, the isolation cloth 104 is bonded to the inner wall of the box 102 by corrosion-resistant strong glue or industrial double-sided tape, which can ensure that the isolation cloth 104 is flat and tightly fitted to the inner wall of the wooden box, and the isolation cloth 104 does not have wrinkles or bubbles, thereby avoiding affecting the uniformity of the experiment and the contact effect between the soil 107 and the flannel 104.

[0063] As a preferred solution, Figure 3 and Figure 5 As shown, before the specific soil 107 is filled into the box 102, the semipermeable membrane 105 is fixed to the inner side of the isolation cloth 104 by corrosion-resistant strong glue or industrial double-sided tape to ensure that the semipermeable membrane 105 is tightly fitted with the isolation cloth 104. The use of corrosion-resistant strong glue or industrial double-sided tape to fix the semipermeable membrane 105 to the inner side of the isolation cloth 104 can ensure that the semipermeable membrane 105 is tightly fitted with the isolation cloth 104 during the entire test process, especially at corners and edges, to avoid bubbles, wrinkles or gaps, and to prevent uneven penetration of chloride ions 109 during the experiment and affect the accuracy of the test results.

[0064] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A steel rod corrosion test device in soil, comprising a cylinder (101), wherein the cylinder (101) is used to contain a salt solution (108) containing chloride ions, characterized in that: Also includes: A box body (102) is arranged in the cylinder body (101), the box body (102) is used to contain soil (107), and a side wall of the box body (102) is provided with a plurality of first through holes (103); An isolation cloth (104) is disposed between the inner wall of the box body (102) and the soil (107), and the isolation cloth (104) is used to prevent the soil (107) in the box body (102) from leaking out of the first through hole (103); A semipermeable membrane (105) is disposed between the isolation cloth (104) and the soil (107), wherein the semipermeable membrane (105) is used to isolate the soil (107) from the salt solution (108), and the chloride ions (109) in the salt solution (108) can pass through the semipermeable membrane (105); A cathode material block is disposed in the salt solution (108); a power supply module, the positive electrode of which is electrically connected to a steel rod (106) buried in the soil (107) in the box (102), the negative electrode of which is electrically connected to the cathode material block, and the power supply module is used to apply current to the steel rod (106); A half-cell potential detection system is connected to the steel rod (106), and the half-cell potential detection system is used to detect the corrosion potential of the steel rod (106).

2. The soil corrosion test device for steel rods according to claim 1, characterized in that: The side wall of the box body (102) is provided with a guide rail (201), a slide plate (202) is slidably connected inside the guide rail (201), the slide plate (202) is fitted with the side wall of the box body (102), the slide plate (202) is used to block the first through hole (103), a plurality of second through holes (203) are provided on the slide plate (202), one second through hole (203) corresponds to one first through hole (103), each first through hole (103) is connected to the second through hole (203) corresponding thereto, and the degree of connectivity between the first through hole (103) and the second through hole (203) can be adjusted by sliding the slide plate (202).

3. The soil corrosion test device for steel rods according to claim 2, characterized in that: The slide plate (202) is connected to an adjustment mechanism (3), the adjustment mechanism (3) comprising a transmission shaft (301) and a chain (302), the transmission shaft (301) being pivotally connected to a side wall of a box body (102), a first sprocket (303) being provided on the transmission shaft (301), a second sprocket (304) being pivotally connected to the side wall of the box body (102), the chain (302) being tooth-connected to the first sprocket (303) and the second sprocket (304), the chain (302) being connected to the slide plate (202), and the chain (302) being arranged perpendicularly to the guide rail (201).

4. The soil steel bar corrosion test device according to claim 1, characterized in that: The side wall of the box body (102) is pivotally connected with a hand wheel (401), the hand wheel (401) is provided with a worm (402), the transmission shaft (301) is provided with a worm wheel (403), the worm (402) and the worm wheel (403) are toothed, and the outer edge of the hand wheel (401) is provided with a scale.

5. The soil corrosion test device for steel rods according to claim 1, characterized in that: The isolation cloth (104) is a flannel cloth made of a material having water absorption and corrosion resistance.

6. The soil corrosion test device for steel rods according to claim 1, characterized in that: The cathode material block is made of stainless steel.

7. The soil corrosion test device for steel rods according to claim 1, characterized in that: The material of the semipermeable membrane (105) is polytetrafluoroethylene.

8. A method for conducting a test using the soil steel rod corrosion test device according to claim 1, characterized in that: The following steps are involved: The steel rod (106) is cut to a specified length, and its surface is cleaned and polished to ensure that the surface of the steel rod (106) is smooth; The box (102) is filled with the prepared specific soil (107), and the concentration of chloride ions (109) in the salt solution (108) in the cylinder (101) should be adjusted according to the test requirements; Controlling the rate at which chloride ions (109) in the cylinder (101) enter the soil (107); The steel rod (106) is buried in the soil (107) as an anode, and the steel rod (106) is ensured to be in close contact with the soil (107). The steel rod (106) is electrically connected to the positive electrode of the power supply module through a wire. The cathode material block is electrically connected to the negative electrode of the power supply module as a cathode, and is placed in the salt solution (108) in the cylinder (101) to ensure that the current circuit is complete. Start the power supply module and set the current density; During the test, the corrosion potential of the steel rod (106) is detected by a half-cell potential detection system at regular intervals, and a corrosion potential change curve is recorded to quantitatively analyze the corrosion rate; After the test, the steel rod (106) is taken out from the soil (107), and the corrosion morphology of its surface is observed at the macroscopic and microscopic levels, and the corrosion uniformity, local corrosion phenomenon and pitting corrosion are further analyzed.

9. The method for conducting a test using the steel rod corrosion test device in soil as claimed in claim 8, characterized in that: Before the specific soil (107) is filled into the box (102), the isolation cloth (104) is bonded to the inner wall of the box (102) by using corrosion-resistant strong glue or industrial double-sided tape. When bonding the isolation cloth (104), ensure that the isolation cloth (104) and the inner wall of the wooden box are flat and tightly fitted.

10. The method for conducting a test using the soil steel bar corrosion test device according to claim 8, characterized in that: Before the specific soil (107) is filled into the box (102), the semipermeable membrane (105) is fixed to the inner side of the isolation cloth (104) by corrosion-resistant strong glue or industrial double-sided tape to ensure that the semipermeable membrane (105) and the isolation cloth (104) are tightly fitted.

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