Accelerated corrosion test detection equipment

Abstract

The invention discloses accelerated corrosion test detection equipment which comprises a cover plate, a basic platform plate, a test tank body, an Ag / Ag reference electrode, a platinum sheet counter electrode, a working electrode, a sealing block, a fixing clamp, a sealing washer, a bolt fastener, a control box, a control box switch, a power plug and a temperature regulation and control module, and the temperature regulation and control module comprises a display, a temperature regulator, a temperature sensor and a heating rod. According to the structural design, corrosion tests at different temperatures and under different corrosion solutions can be achieved, three-electrode electrochemical corrosion monitoring is achieved under the condition that the equipment structure and the corrosion environment do not need to be greatly changed, meanwhile, short-term acceleration tests are achieved, the actual corrosion environment is simulated, the actual service life of a sample is calculated in a fitting mode, and the application prospect is wide. Operation is convenient and fast, the test period is shortened, the test progress is accelerated, the test efficiency is improved, the test result is more accurate, simulation of the long-term variable-temperature corrosion environment can be effectively achieved, and reliability is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of corrosion environment simulation and monitoring equipment, and particularly to an accelerated corrosion test detection device. Background Art

[0002] The phenomenon of metal corrosion can lead to changes in the properties of metals. Therefore, a device capable of simulating the actual corrosion environment is needed to monitor the corrosion condition of materials such as metals and their electrochemical health status in real time.

[0003] Existing corrosion environment simulation devices can usually only perform corrosion monitoring at normal temperature, and cannot simulate the corrosion process under extreme conditions such as high temperature or low temperature. Secondly, existing corrosion environment simulation devices cannot provide information on the corrosion status of materials at any time, resulting in a lag in monitoring results. In addition, existing devices lack microscopic controllability and systematicness, making it difficult to precisely control and analyze the corrosion process. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides an accelerated corrosion test detection device.

[0005] To have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. This summary part is not a general review, nor is it intended to identify key / important constituent elements or delineate the protection scope of these embodiments. Its sole purpose is to present some concepts in a simple form as a prelude to the subsequent detailed description.

[0006] The present invention adopts the following technical solutions:

[0007] The present invention provides an accelerated corrosion test detection device, comprising: a temperature control module, a cover plate, a base platform plate, and a test tank body clamped between the cover plate and the base platform plate;

[0008] The cover plate is connected to the base platform plate to press the specimen to be detected at the lower opening of the test tank body and make it contact with the corrosion solution in the test tank body;

[0009] The temperature control module is used to adjust the temperature of the corrosion solution in the test tank body.

[0010] Further, the temperature control module includes: a micro control unit, a display, a temperature regulator, a temperature sensor, and a heating rod;

[0011] The temperature sensor and the heating rod are arranged in the test tank body;

[0012] The microcontroller unit adjusts the heating temperature of the heating rod according to the operation information of the temperature regulator. Meanwhile, it acquires the detection data of the temperature sensor and controls the display to show the temperature value.

[0013] Furthermore, a through hole is formed in the side wall of the test tank body, and the connecting wires of the temperature sensor and the heating rod are led out from the through hole. The orifice of the through hole is coated with insulating and sealing glue.

[0014] Furthermore, two holes for filling the corrosive solution and installing the electrodes are formed in the cover plate, and the holes communicate with the inside of the test tank body.

[0015] Furthermore, an accelerated corrosion test detection device further includes: an Ag / Ag reference electrode, a platinum sheet counter electrode, a working electrode, a sealing block, and a fixing clip.

[0016] When performing solution corrosion, the sealing block is arranged in the hole to seal the hole.

[0017] When performing electrochemical corrosion, the working electrode is connected to the specimen to be detected, and the fixing clip is arranged at the orifice of the hole and fixes the Ag / Ag reference electrode and the platinum sheet counter electrode at the two holes respectively.

[0018] Furthermore, an accelerated corrosion test detection device further includes: a sealing washer and a bolt fastener; the sealing washer is arranged at the bottom end of the test tank body, and the cover plate and the base platform plate are connected by the bolt fastener to press the sealing washer between the bottom end face of the test tank body and the upper surface of the specimen to be detected.

[0019] Furthermore, an accelerated corrosion test detection device further includes: a control box, a control box switch, and a power plug; the control box is arranged on the base platform plate, and the display and the temperature regulator are arranged on the control box.

[0020] Furthermore, an anti-corrosion layer is provided on the inner walls of the test tank body and the sealing washer; the material of the test tank body is fiberglass; the base platform plate is a wooden board; the sealing block is frustum-shaped and made of high molecular polypropylene.

[0021] Furthermore, the injection amount of the corrosive solution in the test tank body is 3 / 4 of the volume of the test tank body.

[0022] Further, the accelerated corrosion test detection device further includes: a calculation module, configured to predict the service life of the specimen to be detected at a specific temperature T based on the time-temperature equivalence principle and assuming that the electrochemical impedance degradation mechanism remains unchanged under the conditions of constant-temperature immersion and constant-temperature and humidity exposure, according to the change of the electrochemical impedance of the specimen to be detected with time at 20°C, 40°C, and 60°C. The calculation method is as follows:

[0023] Fit the retention rate and time t of the specimen to be detected under different temperature / corrosion solution types according to Equation 5 to obtain the regression parameter τ and the wet-state electrochemical impedance retention rate Y of the specimen to be detected;

[0024] Equation 5: Y = (100 - Y ∞ ) exp(-t / τ) + Y ∞ ;

[0025] In Equation 5, Y is the wet-state electrochemical impedance retention rate of the specimen to be detected; t is the damp heat exposure time; τ is the regression parameter; Y∞ is the wet-state ultimate electrochemical impedance retention rate of the specimen to be detected;

[0026] Substitute the determined regression parameter τ into Equation 6 to calculate the damp heat exposure time t required for the specimen to be detected to reach a specific wet-state electrochemical impedance retention rate Y at a specific temperature T. The wet-state electrochemical impedance retention rates Y are selected as 60%, 70%, 80%, and 90%, and the regression parameter is obtained through data fitting

[0027] Equation 6:

[0028] In Equation 6, A is a constant; E a is the activation energy of performance degradation of the specimen to be detected; R is the universal gas constant; T is in the unit of Kelvin absolute temperature;

[0029] Denote the times required for the electrochemical impedance performance to degrade to the same value, i.e., 60%, 70%, 80%, or 90%, at temperatures T and T a as t and t a , respectively, and calculate the time shift factor TSF between the predicted temperature T a and T according to Equation 7;

[0030] Equation 7:

[0031] In Equation 7, E a is the activation energy of performance degradation of the specimen to be detected; R is the universal gas constant;

[0032] Convert the electrochemical impedance retention rate values obtained at 20°C, 40°C, and 60°C, i.e., 60%, 70%, 80%, or 90%, to the predicted temperature T through Equation 7a t under a ~Y results, and fitting the t a ~Y results through Equation 5 to obtain the long-term electrochemical impedance retention rate of the test specimen to be detected at the predicted temperature T a below.

[0033] Beneficial effects brought by the present invention: The structural design of this application can realize corrosion tests under different temperatures and different corrosive solutions, and realize three-electrode electrochemical corrosion monitoring without significantly changing the equipment structure and corrosive environment. At the same time, short-term accelerated tests can be realized and the actual corrosion environment can be simulated, and the actual service life of the specimen can be calculated by fitting. It is not only convenient and fast to operate, saves the test cycle, speeds up the test progress, and improves the test efficiency, but also the test results are more accurate, can effectively simulate the long-term variable-temperature corrosion environment, and has higher reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 is a schematic structural diagram of an accelerated corrosion test detection device of the present invention when an electrode is installed;

[0036] Figure 2 is a top view of an accelerated corrosion test detection device of the present invention when a sealing block is installed;

[0037] Figure 3 is a schematic structural diagram of the sealing block of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0038] The following will describe the embodiments of the present invention in detail with reference to the drawings. It should be clear that the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0039] As Figures 1 - 3 shown, in some illustrative embodiments, an accelerated corrosion test detection device is provided, including: a cover plate 1, a base platform plate 2, a test tank 3, an Ag / Ag reference electrode 4, a platinum sheet counter electrode 5, a working electrode 6, a sealing block 7, a fixing clip 8, a sealing gasket 9, a bolt fastener 10, a control box 11, a control box switch 12, a power plug 13, a temperature control module, and a calculation module.

[0040] The test tank body 3 is a cylindrical structure with a lower opening, a wall thickness of 6 mm, an inner diameter of 90 mm, and a height of 120 mm, and is used to contain the corrosive solution. The material of the test tank body 3 is fiberglass reinforced plastic. The fiberglass reinforced plastic tank body facilitates the testers to observe the volatilization of the internal corrosive solution in real time, and add the corrosive solution at any time according to the observation results, so as to prevent additional influence on the corrosion of the specimen due to the concentration difference of the corrosive solution and the pressure difference on the specimen to be detected.

[0041] The cover plate 1 is arranged on the top of the test tank body 3, and the thickness of the cover plate 1 is 10 mm. The cover plate 1 and the base platform plate 2 are connected by bolt fasteners 10. Specifically, the diameter of the screw rod in the bolt fasteners 10 is 8 mm. Screw holes can be opened at the corresponding positions of the cover plate 1 and the base platform plate 2, and the upper and lower ends of the screw rod pass through the screw holes and are fixed with nuts. During the process of gradually tightening the nuts, the pressure between the nuts and the cover plate 1 and the base platform plate 2 gradually increases, so as to clamp and fix the specimen 14 to be detected and the test tank body 3 between the cover plate 1 and the base platform plate 2, so that the specimen 14 to be detected is pressed at the lower opening of the test tank body 3 and contacts the corrosive solution in the test tank body 3.

[0042] There are two sets of bolt fasteners 10, which are respectively located on both sides of the test tank body 3 to ensure the evenness of the force during screwing, and further ensure the stability of the overall structure and the tightness after connection.

[0043] In order to prevent the corrosive solution from overflowing along the gap between the test tank body 3 and the specimen 14 to be detected during the addition process and the test heating period, a sealing gasket 9 is arranged at the opening of the test tank body 3 in this embodiment to improve the sealing performance at the contact position between the two. During the process of gradually tightening the nuts in the bolt fasteners 10, the sealing gasket 9 is pressed between the bottom end face of the test tank body 3 and the upper surface of the specimen 14 to be detected. The deformation of the rubber pad during the extrusion process is used to avoid the overflow of the corrosive solution, and at the same time, it can also play a buffering role to avoid the extrusion damage of the test tank body 3 to the specimen 14 to be detected.

[0044] The temperature control module is used to adjust the temperature of the corrosive solution in the test tank body 3 to realize the corrosion test at different temperatures. Among them, the temperature control module includes: a micro control unit, a display 15, a temperature regulator 16, a temperature sensor 17 and a heating rod 18.

[0045] A microcontroller unit is used for data acquisition and analysis and outputs corresponding control instructions. The temperature regulator 16 and the temperature sensor 17 are connected to the data input terminals of the microcontroller unit, and the display 15 and the heating rod 18 are connected to the control output terminals of the microcontroller unit. The probe part of the temperature sensor 17 extends into the test tank 3 to detect the temperature of the corrosive solution in the tank in real time and upload the detected data to the microcontroller unit. The heating rod 18 is arranged in the test tank 3 and generates heat by itself to heat the corrosive solution.

[0046] The microcontroller unit is used to adjust the heating temperature of the heating rod 18 according to the operation information of the temperature regulator 16. The temperature regulator 16 can be a key, including a temperature increase key and a temperature decrease key. When the microcontroller unit detects that the temperature increase key is pressed, the working power of the heating rod 18 is increased to realize the temperature increase of the solution. Otherwise, the working power of the heating rod 18 is decreased. At the same time, the microcontroller unit is used to obtain the detection data of the temperature sensor 17 and control the display 15 to display the measured temperature value so that the operator can understand the temperature data in the tank in real time.

[0047] In this embodiment, the temperature heating control accuracy is ±1°C, the heating and cooling speed of the corrosive solution in the test tank 3 is 15 - 20°C / min, and the temperature adjustment range is 20 - 100°C.

[0048] In this embodiment, through holes are opened on the side wall of the test tank 3, and the connecting wires of the temperature sensor 17 and the heating rod 18 are led out from the through holes and connected to the microcontroller unit in the control box 11. To prevent the corrosive solution from overflowing from the side wall through holes of the test tank 3 and causing a short circuit in the circuit, an insulating sealing glue is coated at the orifice of the through hole, that is, the insulating sealing glue is evenly coated along the circumference of the through hole.

[0049] Two holes 101 for filling the corrosive solution and installing the electrodes are opened on the cover plate 1. The holes 101 are communicated with the inside of the test tank 3. The filling of the corrosive solution and the installation of the electrodes use the same hole, which simplifies the structure and is convenient for operation.

[0050] After the cover plate 1 and the specimen to be tested 14 are fixed using the bolt fastener 10, when performing solution corrosion, the corrosive solution is injected into the test tank 3 from the hole 101, and then the sealing block 7 is inserted into the hole 101 to seal the hole 101, thereby preventing a large amount of volatilization of the corrosive solution from occurring during the solution corrosion monitoring. After sealing, connect the power plug 13 to the power supply and adjust the required corrosion temperature through the temperature control module.

[0051] In this embodiment, the sealing block 7 is frustum-shaped and is made of high molecular polypropylene. High molecular polypropylene has good mechanical strength, acid and alkali corrosion resistance, and excellent heat resistance.

[0052] Injecting too much corrosive solution may cause the self - gravity of the solution to generate a non - negligible pressure on the test specimen 14 to be detected, resulting in distorted measurement data. While injecting too little may lead to an overly long continuous heating time at high temperature, increasing instrument wear. Therefore, in this embodiment, the injection volume of the corrosive solution in the test tank 3 is 3 / 4 of the volume of the test tank 3.

[0053] When performing electrochemical corrosion, it is necessary to ensure the dryness and cleanliness of the outer surfaces of the test tank 3 and the test specimen 14 to be detected, so as to prevent external liquid on the surface from entering the heating system and causing a short - circuit. Before detection, disconnect the power plug 13, and open the sealing block 7 at the hole of the cover plate. After the temperature of the corrosive solution cools to room temperature, connect the working electrode 6 to the test specimen 14 to be detected. The fixing clip 8 is set at the orifice of the hole 101, and the Ag / Ag reference electrode 4 and the platinum - sheet counter electrode 5 are respectively fixed at two holes 101, so that the two electrodes can contact the corrosive solution.

[0054] The fixing clip 8 can specifically adopt a nut, and the electrode is connected to the nut, and a stud is set at the hole 101. The installation and fixation of the electrode are realized by the cooperation of the nut and the stud. After the Ag / Ag reference electrode 4 and the platinum - sheet counter electrode 5 are fixed, connect them to the electrochemical workstation and start monitoring electrochemical corrosion.

[0055] In this embodiment, to prevent the long - term corrosion of the test tank 3 and the sealing gasket 9 by the corrosive solution and the corrosion temperature, an anti - corrosion layer is provided on the inner walls of the test tank 3 and the sealing gasket 9, which can realize the long - term use of the equipment in an environment with variable temperature and variable corrosive solution.

[0056] The control box 11 is set on the basic platform plate 2. The control box switch 12, the display 15 and the temperature regulator 16 are set on the control box 11. To prevent the control box 11 from being short - circuited due to liquid erosion before and during the test, the control box switch 12 should be kept in the closed state.

[0057] In this embodiment, to prevent the left - hand test equipment and the right - hand control box 11 from detaching, causing a short - circuit and increasing the overall rigidity of the equipment, the basic platform plate 2 is made of wood.

[0058] The detection process is as follows:

[0059] First, place the test specimen 14 to be detected at the bottom of the test tank 3, and cooperate with the sealing gasket 9 to tightly fix the cover plate 1 and the basic platform plate 2.

[0060] Then, slowly pour the required corrosive solution into the test tank 3 along the hole 101 on the cover plate 1 until it reaches about 3 / 4 of the capacity, and carefully observe whether there is any overflow of the corrosive solution at the bottom of the test tank 3, the heating rod 18 and the temperature sensor 17. Then, tightly seal the hole 101 at the cover plate with two sealing blocks 7.

[0061] Keep the control box switch 12 in the off state, connect the power plug 13, adjust the temperature to the specified corrosion temperature through the temperature regulator 16. After the temperature of the corrosion solution in the tank is stable, calibrate the equipment sensor with an external thermometer. Start timing when the temperature is accurate, and keep timing until the specified corrosion time is reached, then turn off the power plug 13.

[0062] When the corrosion solution cools down to room temperature, pull out the sealing block 7, insert the Ag / Ag reference electrode 4 and the platinum sheet counter electrode 5, and connect the working electrode 6 to conduct electrochemical corrosion monitoring (polarization curve and electrochemical impedance spectroscopy). After the monitoring is completed, disconnect the three electrodes, seal the hole 101 at the cover plate with the sealing block 7, connect the power plug 13, and conduct the next stage of corrosion and monitoring. During this period, the type of corrosion solution can be changed according to needs, just pay attention to avoiding short circuits in the power supply or other places caused by changing the corrosion solution, until the electrochemical corrosion parameters under different corrosion times, different corrosion temperatures, and different corrosion solution types are obtained, which is convenient for real-time monitoring of the corrosion of the specimen to be tested.

[0063] Finally, according to the Arrhenius formula, the actual service life of the specimen is fitted through a short-term accelerated test.

[0064] A calculation module, which is used to predict the long-term performance evolution law of the specimen to be tested at a specific temperature, that is, the service life at a specific temperature T, based on the time-temperature equivalence principle and assuming that the electrochemical impedance degradation mechanism remains unchanged under the conditions of constant-temperature immersion and constant-temperature and constant-humidity exposure, according to the change of the electrochemical impedance of the specimen to be tested with time at 20°C, 40°C, and 60°C. The calculation method is as follows:

[0065] Electrochemical detection knowledge:

[0066] Tafel polarization curve, as shown in Equation 1 and Equation 2:

[0067] Equation 1:

[0068] In Equation 1, R P is the polarization resistance; B is the Stern-Geary constant; I P coor is the polarization current density.

[0069] Equation 2:

[0070] In Equation 2, β a is the anodic polarization slope of the Tafel curve; β b is the cathodic polarization slope of the Tafel curve.

[0071] EIS curve, as shown in Equation 3 and Equation 4:

[0072] Two-stage equivalent circuit: To explain the corrosion behavior at the interface of the specimen / electrolyte to be tested, two equivalent circuit models were used to fit the EIS data. ω is the angular frequency, ω = 2πf, j is the imaginary unit, and j 2 = -1.

[0073] Early corrosion model, such as Equation 3:

[0074] Equation 3:

[0075] Equation 4:

[0076] In Equations 3 and 4, R s is the corrosion solution resistance; R c is the surface layer resistance of the specimen to be tested; R ct is the charge transfer resistance; C c is the capacitance at the interface between the surface layer of the specimen to be tested and the corrosion solution; C dl is the capacitance at the interface between the interior of the specimen to be tested and the corrosion solution.

[0077] According to Equation 5, the retention rate and time of the specimen to be tested (surface coating equivalent resistance (coating resistance or charge transfer resistance)) under different temperatures / corrosion solution types were fitted to obtain the regression parameter τ and the wet-state electrochemical impedance retention rate Y of the specimen to be tested;

[0078] Equation 5: Y - (100 - Y ∞ ) exp(-t / τ) + Y ∞ ;

[0079] In Equation 5, Y is the wet-state electrochemical impedance retention rate of the specimen to be tested; t is the damp heat exposure time; τ is the regression parameter; Y∞ is the wet-state ultimate electrochemical impedance retention rate of the specimen to be tested.

[0080] The determined regression parameter τ was substituted into Equation 6 to calculate the damp heat exposure time t required for the specimen to be tested to reach a specific wet-state electrochemical impedance retention rate Y at a specific temperature T. The wet-state electrochemical impedance retention rates Y were selected as 60%, 70%, 80%, and 90%, and the regression parameters were obtained through data fitting

[0081] Equation 6:

[0082] In Equation 6, A is a constant; E a is the activation energy for the performance degradation of the specimen to be tested; R is the universal gas constant; the unit of T is the Kelvin absolute temperature.

[0083] The times required for the electrochemical impedance performance to degrade to the same value, i.e., 60%, 70%, 80%, or 90%, at temperatures T and T a were denoted as t and t respectivelya , calculate the time shift factor TSF between the predicted temperature T of the specimen to be tested according to Equation 7 a and T, that is, the quantitative relationship of the time required for the electrochemical impedance of the specimen to be tested to evolve to the same retention rate under different temperature / corrosion solution type conditions;

[0084] Equation 7:

[0085] In Equation 7, E a is the activation energy of the performance degradation of the specimen to be tested; R is the universal gas constant.

[0086] For the electrochemical impedance retention rate values obtained at temperatures of 20°C, 40°C, and 60°C, that is, 60%, 70%, 80%, or 90%, convert them to t a at the predicted temperature T a ~Y results, and fit the t a ~Y results through Equation 5 to obtain the long-term electrochemical impedance retention rate of the specimen to be tested at the predicted temperature T a .

[0087] In this embodiment, after adding different types of corrosion solutions into the test tank 3 sealed by the specimen to be tested 14, the temperature / corrosion solution type is used for coupling, that is, through different aging temperatures and corrosion solution types, and according to the Arrhenius formula, a short-term accelerated test can be realized and the actual corrosion environment can be simulated, the actual service life of the specimen can be fitted and judged, the test cycle can be saved and the test progress can be accelerated, and the three-electrode electrochemical corrosion monitoring can be realized without replacing the specimen and the experimental environment, which is very convenient and fast, and the test efficiency is greatly improved. In addition, the accelerated corrosion test detection equipment of the present invention is simply designed, reasonable, and convenient to process, can effectively simulate the long-term variable temperature corrosion environment, has high reliability, and has a wide application range.

[0088] The accelerated corrosion test detection equipment of the present invention can be designed into different sizes according to different working conditions for the specimen to be tested, and at the same time, this equipment can detect the corrosion conditions of different types of civil engineering materials, and has a wide application range.

[0089] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An accelerated corrosion test detection device, characterized in that, Comprising: A temperature control module, a cover plate, a base platform plate, and a test tank body clamped between the cover plate and the base platform plate; The cover plate is connected to the base platform plate to press the specimen to be detected at the lower opening of the test tank body and make it contact with the corrosion solution in the test tank body; The temperature control module is used to adjust the temperature of the corrosion solution in the test tank body.

2. The accelerated corrosion test detection device according to claim 1, characterized in that, The temperature control module includes: a microcontroller unit, a display, a temperature regulator, a temperature sensor, and a heating rod; The temperature sensor and the heating rod are arranged in the test tank body; The microcontroller unit adjusts the heating temperature of the heating rod according to the operation information of the temperature regulator. At the same time, it acquires the detection data of the temperature sensor and controls the display to display the temperature value.

3. An accelerated corrosion test detection device according to claim 2, characterized in that, A through hole is formed in the side wall of the test tank body, and the connecting wires of the temperature sensor and the heating rod are led out from the through hole, and the orifice of the through hole is coated with insulating sealant glue.

4. An accelerated corrosion test detection device according to claim 3, characterized in that, Two holes for filling the corrosion solution and installing electrodes are formed in the cover plate, and the holes are communicated with the inside of the test tank body.

5. An accelerated corrosion test detection device according to claim 4, characterized in that, It also includes: An Ag / Ag reference electrode, a platinum sheet counter electrode, a working electrode, a sealing block, and a fixing clip; When performing solution corrosion, the sealing block is arranged in the hole to seal the hole; When performing electrochemical corrosion, the working electrode is connected to the specimen to be detected, and the fixing clip is arranged at the orifice of the hole and fixes the Ag / Ag reference electrode and the platinum sheet counter electrode at the two holes respectively.

6. An accelerated corrosion test detection device according to claim 5, characterized in that, It also includes: A sealing gasket and a bolt fastener; the sealing gasket is arranged at the bottom end of the test tank body, and the cover plate and the base platform plate are connected by the bolt fastener to press the sealing gasket between the bottom end face of the test tank body and the upper surface of the specimen to be detected.

7. An accelerated corrosion test detection device according to claim 6, characterized in that, It also includes: A control box, a control box switch, and a power plug; the control box is arranged on the base platform plate, and the display and the temperature regulator are arranged on the control box.

8. An accelerated corrosion test detection device according to claim 7, characterized in that, An anti-corrosion layer is provided on the inner walls of the test tank body and the sealing gasket; the material of the test tank body is fiberglass; the base platform plate is a wooden board; the sealing block is frustum-shaped and the material is high molecular polypropylene.

9. An accelerated corrosion test detection device according to claim 8, characterized in that, The injection volume of the corrosion solution in the test tank body is 3 / 4 of the volume of the test tank body.

10. An accelerated corrosion test detection device according to claim 9, characterized in that, It also includes: A calculation module, which is used to predict the service life of the specimen to be detected at a specific temperature T based on the time-temperature equivalence principle according to the change of the electrochemical impedance of the specimen to be detected with time at 20°C, 40°C, and 60°C, and assuming that the electrochemical impedance degradation mechanism remains unchanged under the conditions of constant temperature immersion and constant temperature and humidity exposure. The calculation method is: Fitting the retention rate and time t of the specimen to be detected under different temperature / corrosion solution types according to Equation 5 to obtain the regression parameter τ and the wet-state electrochemical impedance retention rate Y of the specimen to be detected; 5:Y(100-Y) ∞ )exp(-t / τ)+Y ∞ ; In Equation 5, Y is the wet-state electrochemical impedance retention rate of the specimen to be detected; t is the damp heat exposure time; τ is the regression parameter; Y∞ is the wet-state ultimate electrochemical impedance retention rate of the specimen to be detected; Substitute the determined regression parameter τ into Equation 6 to calculate the damp heat exposure time t required for the test specimen to be detected to reach a specific wet-state electrochemical impedance retention rate Y at a specific temperature T. The wet-state electrochemical impedance retention rates Y are selected as 60%, 70%, 80%, and 90%, and the regression parameters are obtained through data fitting. Formula 6: In Equation 6, A is a constant; E a is the activation energy of the performance degradation of the specimen to be detected; R is the universal gas constant; the unit of T is the absolute temperature in Kelvin; The temperatures are T and T respectively a The times required for the electrochemical impedance performance to degrade to the same value, i.e., 60%, 70%, 80% or 90%, are denoted as t and t respectively a , and according to Equation 7, the time shift factor TSF between the predicted temperature T a and T of the specimen to be tested is calculated; Formula 7: In Equation 7, E a is the activation energy of performance degradation of the specimen to be detected; R is the universal gas constant; The numerical values of the electrochemical impedance retention rates obtained at 20 °C, 40 °C and 60 °C, namely 60%, 70%, 80% or 90%, are converted into the predicted temperature T through Equation 7 a of t a ~Y results, and the t a ~Y results are fitted through Equation 5 to obtain the long-term electrochemical impedance retention rate of the specimen to be tested at the predicted temperature T a of.

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