Dissolution testing device and method for soluble metal material

Abstract

The invention relates to a dissolution testing device and method for a soluble metal material, the dissolution testing device comprises a corrosion reaction unit, the corrosion reaction unit is connected with a corrosion solution storage unit and a gas detection unit, the corrosion solution storage unit is connected with the corrosion reaction unit through a circulation unit, and the gas detection unit is provided with a flow metering device. And the gas detection unit is used for detecting the amount of gas generated in the corrosion reaction unit, the pressure in the corrosion reaction unit is controlled to be 1-3.5 standard atmospheric pressures, and the boiling point of the corrosion solution is maintained at a certain constant temperature between 100 DEG C and 250 DEG C. According to the invention, the dissolution condition and rate of the material can be recorded in real time, and the obtained dissolution rate data is real and accurate; in the dissolution test process, only the amount of generated hydrogen needs to be measured, and the operation is simple and accurate; the dissolution rate of the sample at the temperature of 100 DEG C or above can be tested.

Description

Technical Field

[0001] This application relates to a dissolution testing device and method for soluble metal materials. Background Technology

[0002] Soluble bridge plugs / sealers are downhole tools widely used in multi-stage fracturing operations in shale oil and gas, tight oil and gas reservoirs. Their primary purpose is to temporarily seal fractured sections during staged fracturing in horizontal wells, creating independent conditions for subsequent stages. They are typically made of magnesium alloy or composite materials, possessing excellent solubility. After fracturing, the bridge plug automatically dissolves in the downhole formation water or injection fluid, eliminating the need for traditional drilling and grinding processes. This significantly saves operation time, reduces costs and risks; their compact structure and good pressure-bearing capacity effectively ensure the sealing reliability of staged fracturing, enabling efficient and safe continuous operations.

[0003] The solubility evaluation system for magnesium-based materials such as bridge plugs and plugs usually involves placing the sample in an electrolyte solution at an appropriate temperature using methods such as hanging plates. After a certain period of time, the sample is taken out, dried, and weighed. The change in weight is used to measure the solubility of the material. This method has many drawbacks: (1) During the material dissolution process, the dissolution status and rate of the material cannot be recorded in real time. This is because the dissolution rate of the material is usually irregular, and when calculating the dissolution rate, it can only be fitted to a regular shape. The actual dissolution rate has an unavoidable error with it; (2) In a fixed container, the concentration of the electrolyte solution will decrease over time, and the water will evaporate, which cannot accurately reflect the dissolution rate at a certain concentration; (3) When the sample is dried and weighed at regular intervals, the surface dissolution products and the porosity of the material itself will cause additional material loss. The weight loss data and test conclusions are seriously inaccurate, and human factors far exceed system errors; (4) During downhole construction, the liquid will flow and the pressure will change. Existing test devices cannot accurately simulate downhole conditions. In particular, the electrolyte solution is basically a water-based solution with a boiling point of about 100°C, which cannot accurately evaluate the dissolution rate above 100°C.

[0004] There is a need in the prior art for a dissolution testing device and method that can overcome the above-mentioned defects and be widely used in the dissolution testing of soluble materials used in oil well tools. Summary of the Invention

[0005] The purpose of this application is to provide a dissolution testing device and method for soluble metal materials. During the material dissolution process, the dissolution status and rate of the material can be recorded in real time, and the obtained dissolution rate data is true and accurate. During the dissolution test, only the amount of hydrogen gas generated needs to be measured, making the operation simple and accurate. It can test the dissolution rate of samples above 100°C.

[0006] This application relates to a dissolution testing device for soluble metal materials, comprising a corrosion reaction unit, which is connected to a corrosion solution storage unit and a gas detection unit. The corrosion solution storage unit is connected to the corrosion reaction unit through a circulation unit. The gas detection unit is equipped with a flow metering device for detecting the amount of gas generated in the corrosion reaction unit. The pressure inside the corrosion reaction unit is controlled at 1-3.5 standard atmospheres to maintain the boiling point of the corrosion solution at a constant temperature between 100-250°C.

[0007] The flow metering device and the corrosion reaction unit may be connected to a drying device; the flow metering device may also be connected to a gas compressor and a gas storage tank; at least one of the flow metering device and the gas storage tank may be connected to a gas leak detection device; the corrosion reaction unit may also be connected to at least one of a temperature monitoring device, a liquid level monitoring device, and a heating device; the corrosion solution storage unit may be equipped with at least one of a liquid level monitoring device, a pressure gauge, and a concentration monitoring device; the corrosion reaction unit may include at least two reactors connected in parallel; it may also include a control unit, which may include a controller, a human-machine interface device, and a control module; the control module may include a multi-loop PID temperature control unit, a pressure monitoring and interlock control unit, a liquid level monitoring and interlock control unit, and a safety interlock protection unit; the safety interlock protection unit may include at least one of a pressure alarm module, a temperature alarm module, a liquid level over-limit module, and a gas leak alarm module.

[0008] This application also relates to a method for testing the dissolution of soluble metallic materials, including the following steps: (1) Saltwater supply A chloride salt solution with a mass concentration of 3%-6% is injected into the main storage tank. After the liquid level reaches the preset height, the liquid level monitoring and concentration detection module is activated. After impurities are removed by the filter, the solution enters the circulation power unit. (2) Continuous replacement The circulating power unit starts the delivery pump and adjusts the circulation flow through the valve. The salt solution enters the heating device through the check valve. The flow detection element collects the flow data in real time and feeds it back to the control system for coordinated adjustment to ensure the stability of the total flow. (3) Temperature and pressure regulation A target temperature is set between 100-250℃. The heating device is started, and the temperature control system uses real-time data from the temperature sensor and an adjustment algorithm to control the heating power, gradually raising the temperature of the salt solution to the set value and stabilizing it, with temperature fluctuations controlled within ±1℃. After the system pressure rises to the target temperature, it stabilizes within the range of 3.5-3.8MPa. The pressure sensor provides real-time feedback data. When the pressure exceeds 3.9MPa, the unloading valve automatically opens to release pressure to 3.5MPa. If the pressure exceeds 4.0MPa, the system issues an audible and visual alarm and initiates an emergency shutdown procedure. After the transfer pump heats the salt solution to the set temperature, it enters the reactor of the corrosion reaction unit. (4) Corrosion reaction The temperature-controlled salt solution enters the reactor and comes into full contact with the test sample inside the reactor to carry out a continuous corrosion reaction; the pressure sensors in the reactor monitor the chamber pressure to ensure stable operating pressure. (5) Gas processing The mixed gas of hydrogen and water vapor generated by the reaction enters the dehydration and drying device through the outlet pipeline to remove water vapor, so that the water vapor content at the outlet is ≤5% RH; the dehydrated gas enters the gas pressure detection unit, the flow meter records the gas volume, and the control system automatically calculates the molar amount of hydrogen emission and the generation rate through the ideal gas law, and the data is displayed and stored in real time. (6) Circulation The salt solution after the reaction flows back to the main storage tank through the pipeline, forming a closed loop; the detected hydrogen enters the hydrogen compressor, is compressed and stored in the hydrogen collection tank.

[0009] This application provides a dissolution testing device and method for soluble metallic materials, which has the following technical advantages: (1) This device uses the real-time generation of the test dissolution product to obtain the data, which greatly expands the selection space of the test items; during the material dissolution process, the dissolution status and rate of the material can be recorded in real time, and the obtained dissolution rate data is real and accurate. (2) This application uses a sensor to automatically replenish solute and solvent. Fresh solution is continuously injected into the main storage tank through the replenishment port, and waste solution is discharged through the drain port, which can stabilize the concentration of electrolyte solution at the set concentration. (3) During the dissolution test, there is no need to dry the sample or weigh it. Only the amount of hydrogen generated needs to be measured, which will not lead to the inaccuracy of the test conclusion. (4) The boiling point of the electrolyte solution used in this application is maintained at a constant temperature between 100-250°C, thereby providing a test scheme and apparatus that can test the dissolution rate of a sample above 100°C. Attached Figure Description

[0010] Figure 1This is a flowchart of the dissolution test for soluble metal materials in this application.

[0011] Figure 2 This is the reaction data curve from Example 1 of this application.

[0012] Figure 3 This is the reaction data curve in Example 2 of this application.

[0013] Figure 4 This is the reaction data curve in Example 3 of this application. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be arbitrarily combined with each other.

[0015] This application provides a dissolution testing device and method for soluble metallic materials, applicable to magnesium-based soluble materials, such as those used in downhole fracturing tools like bridge plugs, sliding sleeves, and fracturing balls. The device and method utilize a chloride-based electrolyte solution, such as potassium chloride or sodium chloride, to record the dissolution rate and state of the magnesium-based soluble material in real time. The evaluation of the dissolution rate relies on the dissolution of magnesium-based and aluminum-based soluble materials in the electrolyte solution, releasing hydrogen gas. The device monitors the hydrogen content in the reaction products in real time to calculate the reaction rate. Chloride ions ionized from the chloride-based electrolyte solution can disrupt the integrity of the oxide film, reduce solution resistance, and accelerate the electrochemical reaction; further increases in chloride concentration enhance the dissolution rate. Increased temperature increases ion migration rate and reaction activation energy, significantly accelerating anodic dissolution and cathodic hydrogen evolution rates, and shortening the dissolution time.

[0016] Taking magnesium alloys as an example, the reaction occurring in a potassium chloride aqueous solution is essentially the electrochemical corrosion of magnesium. The overall reaction involves magnesium reacting with water to produce hydrogen gas and magnesium hydroxide. In this reaction, the potassium chloride solution acts as an electrolyte, increasing the solution's conductivity and accelerating electron transfer. Chloride ions are corrosive and can damage the passivation film on the magnesium surface, making corrosion easier. While potassium and chloride ions themselves do not participate in the reaction, the localized acidification effect of chloride ions promotes hydrogen evolution.

[0017] The chemical reaction equation is as follows:

[0018] More specifically, this application employs a pressure-sealed reaction vessel device. The pressure of the chloride electrolyte solution used to dissolve metal materials within the reaction vessel is controlled at 1-3.5 standard atmospheres, maintaining the boiling point of the electrolyte solution at a constant temperature between 100-250°C. This provides a testing scheme and device capable of testing the dissolution rate of samples above 100°C. This application uses sensors to automatically replenish solute and solvent, stabilizing the electrolyte solution concentration at a set level. Sensors detect the real-time hydrogen content, pressure, and ambient temperature in the reaction products, obtaining instantaneous reaction rate data, which is then processed, displayed, stored, and output in real-time by a computer. The device can also be equipped with a combustion chamber to collect the hydrogen gas from the reaction products, completely combust it within the combustion chamber, and discharge water, thus achieving safe and harmless treatment.

[0019] This application utilizes a control system to monitor parameters such as temperature, pressure, flow rate, gas composition, and solution concentration in real time at each stage, achieving interlocking protection and remote control. A dissolution testing device for soluble metal materials according to this application includes the following components: (1) Saltwater storage and supply unit Main storage tank: The tank has an inlet and a replenishment port on the top, and an outlet on the bottom. It is equipped with a level monitoring device, pressure gauge, and online concentration detection module to ensure a stable supply of the medium. The solution in the main storage tank can be continuously replaced, and precise flow control avoids temperature and pressure fluctuations. The salt solution uses potassium chloride or sodium chloride solution, which is non-flammable and non-explosive.

[0020] (2) Loop Unit It adopts a high-pressure corrosion-resistant delivery pump, with working pressure adapted to the system pressure requirements and flow rate adjustable within a certain range. It is suitable for constant flow circulation and continuous replacement coordinated working conditions to ensure stable medium circulation.

[0021] (3) Corrosion reaction unit Two tubular reactors, designed in parallel, enable continuous experimental operation. The effective volume of each reactor chamber is simultaneously expanded, and an internal non-metallic support, such as non-conductive ceramic, is used to fix the test sample, ensuring sufficient contact between the sample and the brine medium without electrochemical interference. Temperature control: The heating device is designed for a temperature range of 0~600℃, with the operating temperature arbitrarily set within the extreme temperature range of 0~220℃, and is equipped with an independent over-temperature protection system (TSS). The system operating pressure is controlled within 3.8MPa to ensure the boiling point meets the standard and provides sufficient safety margin. Multi-stage pressure protection is configured, including a pressure sensor, pointer pressure gauge, back pressure valve, and burst valve, providing overpressure alarm and automatic pressure relief for dual protection.

[0022] (4) Gas detection and measurement unit A dehydration and drying unit is connected after the corrosion reaction unit to dehydrate and dry the reaction-generated gases. A pressure sensor is connected after the dehydration and drying unit to monitor the formation of reactants in real time. Temperature, pressure, and gas emission molar volume are displayed in real time via a flow meter.

[0023] (5) Hydrogen safety handling unit A hydrogen collection scheme is prioritized, comprising a hydrogen collection tank, a hydrogen compressor, and a dehydration and drying unit (sharing a back-end drying module with the gas detection unit) to achieve hydrogen collection, compression, drying, and storage. The entire hydrogen treatment system is explosion-proof, and the collection tank / treatment unit area is equipped with a hydrogen leak alarm interlocked with the control system. In case of excessive leakage, the power to the reaction system is automatically cut off and ventilation is activated. The collected hydrogen can be recycled or discharged after harmless treatment.

[0024] (6) Detection and Protection Unit Temperature detection employs two sets of thermocouples with matching thermocouple sheaths to detect the reactor inlet and outlet temperatures respectively. The temperature sensors provide real-time feedback to the control unit, achieving a temperature control accuracy of ±1℃. Pressure detection: Two pressure sensors and two pointer pressure gauges are configured to detect the pressure in the two reactor chambers respectively. Safety valves and burst valves are interlocked to automatically relieve pressure in case of overpressure. Two flow detection elements are provided to monitor the brine circulation flow and continuous replacement flow respectively. Functions such as gas detection over-limit interlock and continuous replacement abnormality interlock ensure comprehensive system safety.

[0025] (7) Control Unit The control unit, through automated control, has a core control system, a human-machine interface device, and control modules. The core control system can adopt a PLC controller, combined with a distributed I / O system. The human-machine interface device includes an industrial touch screen, an integrated monitoring screen, and an exhaust gas treatment status display screen, supporting parameter setting, process monitoring, data display, and video playback. The control modules include a multi-loop PID temperature control unit, a pressure monitoring and interlock control unit, a liquid level monitoring and interlock control unit, a safety interlock protection unit, a process parameter trend recording unit, and a data export unit.

[0026] The safety interlock protection unit includes functions such as pressure, temperature, and liquid level over-limit alarms and automatic actions, as well as hydrogen leak alarms. When the temperature or pressure exceeds the set high limit, the system logic will automatically take protective action, shutting off the high-voltage power supply to the reaction unit, preventing the heating points on the system from continuing to heat, and stopping the equipment from operating, thus providing forced protection for the process unit's equipment and power supply circuits. At the same time, the control screen will flash red to indicate the detailed information of the alarm point, such as the point name, over-temperature value, and alarm time, so that the operator can make the correct judgment and take appropriate action.

[0027] This application provides a dissolution test method for soluble metallic materials, which achieves high-pressure, continuous, and safe salt water corrosion experiments through the coordinated operation of five core units, including the following steps: (1) Saltwater supply A chloride salt solution with a mass concentration of 3%-6%, preferably 4%, is injected into the main storage tank. After the liquid level reaches the preset height, the liquid level monitoring and concentration detection module is activated. After impurities are removed by the filter, the solution enters the circulation power unit.

[0028] (2) Continuous replacement The continuous replacement system is started, and the replacement flow rate is set. Fresh solution is continuously injected into the main storage tank through the replenishment port, while waste solution is discharged through the drain port. The flow rate is controlled in a closed loop to ensure that the replacement process does not affect the circulation flow rate and system temperature and pressure. Specifically, the circulation power unit starts the delivery pump and adjusts the circulation flow rate through valves, for example, to 200-400 ml / min. The salt solution enters the heating device through a one-way valve. The flow detection element collects the flow data in real time and feeds it back to the control system, which coordinates with the continuous replacement flow rate to ensure a stable total flow rate.

[0029] (3) Temperature and pressure regulation The target temperature is set at 220℃. The heating device is started, and the temperature control system uses an adjustment algorithm to control the heating power based on real-time data from the temperature sensor, so that the temperature of the brine solution gradually rises to the set value and stabilizes, with temperature fluctuations controlled within ±1℃. The over-temperature protection system (TSS) is independent of the main control system. When the temperature exceeds 230℃, it automatically cuts off the heating power. After the system pressure rises to 220℃, it stabilizes in the range of 3.5-3.8MPa. The pressure sensor provides real-time feedback data. When the pressure exceeds 3.9MPa, the unloading valve automatically opens to release pressure to 3.5MPa. If the pressure exceeds 4.0MPa, the system issues an audible and visual alarm and initiates an emergency shutdown procedure. The transfer pump heats the brine solution to the set temperature of 220℃ and then enters the tubular reactor.

[0030] (4) Corrosion reaction The salt solution reacts with the sample in the reactor to produce hydrogen gas and corrosion products. Specifically, the temperature-controlled salt solution enters the tubular reactor and comes into full contact with the sample to be tested inside the reactor. The continuous corrosion reaction takes place at 220℃ and 3.5-3.8MPa. During the experiment, solution samples can be collected through the reserved sampling port and sampled by a high-pressure sampling device. Pressure sensors in the two reactors monitor the chamber pressure to ensure stable operating pressure.

[0031] (5) Gas processing The gas produced in the reaction contains hydrogen and water vapor. It is piped out and first passes through a dehydration and drying unit to remove the water vapor before entering the pressure detection system. Subsequently, it is processed by hydrogen collection. Specifically, the mixed gas of hydrogen and water vapor produced in the reaction enters the dehydration and drying unit through the outlet pipe to remove the water vapor, ensuring that the outlet water vapor content is ≤5% RH (relative humidity ≤5%) to avoid damage to subsequent sensors. The dehydrated gas enters the gas pressure detection unit, the flow meter records the gas volume, and the control system automatically calculates the molar amount of hydrogen emitted and the generation rate using the ideal gas law, thus measuring the reaction rate. The data is displayed and stored in real time. (6) Circulation The salt solution after the reaction flows back to the main storage tank through the pipeline, forming a closed loop; the detected hydrogen enters the hydrogen compressor, is compressed and stored in the hydrogen collection tank.

[0032] This application enables process data monitoring, gas composition analysis, continuous regulation and control, and remote monitoring and interlocking. It allows for process flow display, gas detection data viewing, remote operation control, and alarm record querying via a graphical interface. It supports both local and remote control modes; in remote mode, it allows for parameter setting, equipment start / stop, and alarm push notifications, meeting the needs of unattended experiments. Data acquisition and storage involves real-time acquisition of parameters such as temperature, pressure, circulation flow rate, replacement flow rate, hydrogen content, water vapor content, and solution concentration at a frequency of once per minute. Data is automatically stored on the industrial control computer's hard drive and a cloud server. Data storage periods and export rules can be set to create a complete experimental data record. Example 1

[0033] The total weight of the φ106 soluble bridge plug (excluding the rubber sleeve) is 3.97 kg, of which the weight of the zirconia ceramic slip is 0.194 kg, the weight of the soluble material is 3.776 kg, and the total weight of the soluble material in the matching soluble ball is 0.27 kg. The magnesium content of the soluble magnesium alloy material is approximately 92-93%, so the total magnesium content of the soluble bridge plug and ball is 3.72 kg. 120 g of analytical grade potassium chloride and 120 L of pure water were mixed and stirred evenly to obtain a 0.1% potassium chloride standard solution. The solution was placed in a high-temperature and high-pressure reactor, sealed, and purged with nitrogen three times at 2 MPa each time, maintaining the pressure for 5 min before venting. The temperature control system was started, and the temperature was increased to 80±2℃ at a rate of 5℃ / min. The molar amount of hydrogen was measured every 4 hours using the hydrogen metering module of the high-temperature reactor. The reaction continued until complete dissolution and the gas production no longer changed, at which point the experiment was stopped.

[0034] Experimental results: The reaction lasted for 100 hours. According to the hydrogen metering module in the high-temperature reactor, the total amount of hydrogen produced was 155 mol. The hydrogen production rate per unit time was: 4.97 mol / h average from 0-24 hours, 1.26 mol / h average from 24-48 hours, 0.16 mol / h average from 48-72 hours, 0.06 mol / h average from 72-96 hours, and an overall average of 1.61 mol / h. Detailed reaction data curves are shown below. Figure 2 . Example 2

[0035] AG52 soluble extruded rods were processed into φ20*20mm samples, weighing 11.737g, with a total magnesium mass of 10.798g. The experiment was conducted using a 0.84% ​​potassium chloride standard solution following the steps in Example 1. The temperature control system was activated, and the temperature was increased to 50±2℃ at a rate of 5℃ / min. The molar amount of hydrogen was recorded hourly using the hydrogen metering module in the high-temperature reactor.

[0036] Experimental results: The reaction lasted for 20 hours. According to the hydrogen metering module of the high-temperature reactor, the total amount of hydrogen produced was 0.44 mol; the hydrogen production rate per unit time was 4 × 10⁻⁶ h on average from 0 to 5 hours. -2 mol / h, average 2.8*10 over 5-10 hours -2 mol / h, average 1.5*10⁻¹⁵h. -2 mol / h, average 0.6*10 over 15-20 hours. -2 mol / h, with an average of 2.3*10⁻⁶ throughout the process. -2 mol / h. Detailed reaction data curves can be found in [reference needed]. Figure 3 . Example 3

[0037] AG23 soluble extruded rods were processed into φ20*20mm samples, weighing 11.25g, with a total magnesium mass of 10.35g. The experiment was conducted using a 3% potassium chloride standard solution following the steps in Example 1. The temperature control system was activated, raising the temperature to 130±2℃ at a rate of 5℃ / min. The molar amount of hydrogen was recorded hourly using the hydrogen metering module in the high-temperature reactor.

[0038] Experimental results: The reaction lasted for 8 hours. According to the hydrogen metering module of the high-temperature reactor, the total amount of hydrogen produced was 0.42 mol; the hydrogen production rate per unit time was 6.44 × 10⁻⁶ per hour from 0 to 2 hours. -2 mol / h, average 9.16*10⁻⁴ h over 2-4 h. -2 mol / h, average 4.46*10 over 4-6 hours -2 mol / h, average 0.94*10 over 6-8 hours. -2 mol / h, with an average of 5.52*10⁻⁶ throughout the process. -2 mol / h. See detailed reaction rate. Figure 4 .

[0039] Although the embodiments disclosed in this application are as described above, the content is merely for the purpose of facilitating understanding of this application and is not intended to limit this application. Any person skilled in the art to which this application pertains may make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in this application; however, the scope of patent protection of this application shall still be determined by the scope defined in the appended claims.

Claims

1. A dissolution testing apparatus for dissolvable metal materials, characterized by, The corrosion reaction unit is connected with a corrosion solution storage unit and a gas detection unit respectively, the corrosion solution storage unit is connected with the corrosion reaction unit through a circulation unit, the gas detection unit is provided with a flow metering device for detecting the amount of generated gas in the corrosion reaction unit, the pressure inside the corrosion reaction unit is controlled at 1-3.5 standard atmospheres, and the boiling point of the corrosion solution is maintained at a certain constant temperature between 100-250 DEG C.

2. The dissolution testing apparatus of claim 1, wherein, The flow metering device and the corrosion reaction unit are further provided with a drying device.

3. The dissolution testing apparatus of claim 1 or 2, wherein, The flow metering device is further connected with a gas compressor and a gas storage tank.

4. The dissolution testing apparatus of claim 3, wherein, At least one of the flow metering device and the gas storage tank is connected to a gas leakage detection device.

5. The dissolution testing apparatus of claim 1 or 2 or 4, wherein, The corrosion reaction unit is further connected with at least one of a temperature monitoring device, a liquid level monitoring device and a heating device.

6. The dissolution testing apparatus of claim 1 or 2 or 4, wherein, The corrosion solution storage unit is provided with at least one of a liquid level monitoring device, a pressure gauge and a concentration monitoring device.

7. The dissolution testing apparatus of claim 1 or 2 or 4, wherein, The corrosion reaction unit comprises at least two sets of reactors connected in parallel.

8. The dissolution testing apparatus of claim 1 or 2 or 4, wherein, A control unit is further included, which comprises a controller, a man-machine interaction device and a control module; the control module comprises a multi-loop PID temperature control unit, a pressure monitoring and interlocking control unit, a liquid level monitoring and interlocking control unit and a safety interlocking protection unit.

9. The dissolution testing apparatus of claim 8, wherein, The safety interlocking protection unit comprises at least one of a pressure alarm module, a temperature alarm module, a liquid level overrun module and a gas leakage alarm module.

10. A method of testing the dissolution of a dissolvable metal material, characterized by, The following steps are included: (1) Salt water supply A chlorate solution with a mass concentration of 3%-6% is injected into a main storage tank, after the liquid level reaches a preset height, the liquid level monitoring and concentration detection module is started, and after impurities are removed through a filter, the solution enters a circulation power unit; (2) Continuous replacement The circulation power unit starts a delivery pump, adjusts the circulation flow through a valve, the salt solution enters a heating device through a check valve, a flow detection element collects flow data in real time and feeds back to a control system for coordinated adjustment to ensure stable total flow; (3) Temperature and pressure adjustment A target temperature between 100-250 DEG C is set, the heating device is started, the temperature control system controls the heating power by using an adjusting algorithm based on real-time data fed back by a temperature sensor, so that the temperature of the salt solution gradually rises to the set value and is stabilized, the temperature fluctuation is controlled within ±1 DEG C; the system pressure is stabilized in the range of 3.5-3.8 MPa after the temperature rises to the target temperature, a pressure sensor feeds back data in real time, when the pressure exceeds 3.9 MPa, a relief valve is automatically opened to release pressure to 3.5 MPa; if the pressure exceeds 4.0 MPa, the system issues an audible and visual alarm and starts an emergency shutdown program; after the delivery pump heats the salt solution to the set temperature, the salt solution enters the reactor of the corrosion reaction unit; (4) Corrosion reaction The temperature-adjusted salt solution enters the reactor and fully contacts with the sample to be tested in the reactor for continuous corrosion reaction; the pressure sensor of the reactor monitors the cavity pressure respectively to ensure stable operating pressure; (5) Gas treatment The mixed gas of hydrogen and water vapor generated by the reaction is introduced into a dehydration drying device through a pipeline to remove water vapor, so that the water vapor content at the outlet is ≤5% RH; the dehydrated gas enters a gas pressure detection unit, a flow metering instrument records the gas volume, and a control system automatically calculates the hydrogen discharge molar amount and generation rate through an ideal gas state equation, and the data is displayed and stored in real time; (6) Circulating reflux The salt solution after the reaction is refluxed to the main liquid storage tank through a pipeline to form a closed loop circulation; the hydrogen after detection enters a hydrogen compressor and is stored in a hydrogen collection tank after compression.

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