Material corrosion testing system

Abstract

The invention discloses a material corrosion test system which comprises a sample piece extraction system, a sample holder buffer chamber, a vacuum isolation chamber and a corrosion simulation system, the sample holder buffer chamber is communicated with the vacuum isolation chamber, and the corrosion simulation system is arranged in the vacuum isolation chamber; the sample piece extraction system comprises a controller, a stepping motor and an electromagnet; the corrosion simulation system comprises a corrosion tank body, a heating system and a sample holder, the heating system comprises a base and a heating wire, and the corrosion tank body is placed on the base; the sample holder is positioned in the corrosion tank body; a stepping motor of the sample piece extraction system drives an electromagnet to move up and down so as to drive a sample frame to move. According to the material corrosion testing system, a metal corrosion system under actual working conditions is simulated through the corrosion simulation system, semi-automatic starting and stopping sampling is achieved through the sample piece extraction system, corrosion experiments of different time durations can be conducted at the same time, and the influence of the external environment on experimental samples in the experiment process is greatly reduced.

Description

Technical Field

[0001] The invention belongs to the field of material corrosion testing, and in particular relates to a material corrosion testing system. Background Art

[0002] Nuclear fusion energy has the advantages of being clean, efficient and resource-rich, and is considered to be an effective way to solve the problem of future energy shortages. The material issue is a difficulty in truly pushing fusion energy into commercial projects. As a key component in future fusion reactors, the blanket plays many important functions such as tritium proliferation, heat transfer, and radiation protection. The blanket technology restricts the development of fusion technology.

[0003] The environment in which the blanket structure materials of fusion reactors are located is relatively harsh, and the requirements for material performance are relatively high. In fusion reactors, impurity elements such as helium and hydrogen produced by high-flux 14MeV neutron irradiation and transmutation will have a significant impact on the materials, resulting in irradiation defects and helium bubbles in the materials, which will significantly reduce the mechanical properties of the materials such as strength and toughness, or even cause failure, thereby reducing the life of the materials in the fusion reactor and affecting the normal operation and safety of the reactor. At the same time, the blanket structure materials will also be subject to high heat loads, as well as the corrosion of coolants and liquid tritium multipliers. At present, the corrosion problems of blanket structure materials and liquid metals are mainly studied by decommissioned components from large devices. There are few experimental samples and the external environment has a great impact. Therefore, a set of materials that can simulate actual working conditions, especially liquid metal corrosion test systems, is needed to help understand the corrosion mechanism of materials in the corresponding environment. This has important scientific significance and application value for the design and development of protective coatings and the prediction of the degradation and life of materials and protective coatings in high-temperature service environments. Summary of the invention

[0004] In order to simulate the corrosion system under actual working conditions, study the corrosion mechanism of materials, and provide corrosion-related data for material selection, the purpose of the present invention is to provide a material corrosion testing system, which realizes semi-automatic start-stop sampling, can carry out corrosion experiments of different time lengths at the same time, and greatly reduces the influence of the external environment on the experimental samples during the experiment.

[0005] The present invention is achieved through the following technical solutions:

[0006] A material corrosion testing system comprises a sample extraction system, a sample rack buffer chamber, a vacuum isolation chamber and a corrosion simulation system; the sample rack buffer chamber and the vacuum isolation chamber are connected, and the corrosion simulation system is arranged inside the vacuum isolation chamber;

[0007] Wherein, the sample extraction system comprises a controller, a stepper motor and an electromagnet, the controller is connected to the stepper motor, and the stepper motor is connected to the electromagnet;

[0008] The corrosion simulation system comprises a corrosion tank, a heating system and a sample rack, wherein the heating system comprises a base and a heating wire embedded in the base, and the corrosion tank is directly placed on the base;

[0009] The stepper motor of the sample extraction system drives the electromagnet to move up and down, thereby driving the movement of the sample rack.

[0010] Wherein, the sample extraction system further comprises a motor chamber, the stepper motor is located in the electrode chamber, and the motor chamber and the sample rack buffer chamber are connected via a connector;

[0011] The material corrosion testing system also includes a locking buckle, which is used to lock and seal the motor chamber and the sample holder buffer chamber.

[0012] Furthermore, the stepper motor is connected to an external controller via a cable, and a control line sealing port is also provided on the motor chamber.

[0013] Furthermore, the side wall of the sample rack buffer chamber is provided with a vacuum joint and an air filling port.

[0014] Furthermore, a connecting pipe is provided between the vacuum isolation chamber and the sample rack buffer chamber.

[0015] Furthermore, a gate valve is provided between the sample rack buffer chamber and the vacuum isolation chamber, the lower end of the sample rack buffer chamber is connected to the gate valve, the top of the vacuum isolation chamber is connected to the gate valve, and the top of the corrosion tank is connected to the gate valve.

[0016] Furthermore, a heat dissipation flange is provided between the gate valve and the vacuum isolation chamber.

[0017] Furthermore, a thermocouple for detecting temperature is connected at the center of the base, and the thermocouple is connected to a controller via an electrode flange.

[0018] Furthermore, the bottom film of the sample holder is a hollow tip structure.

[0019] Furthermore, the bottom film of the sample holder and the corrosion tank are both made of molybdenum metal, and the base is made of fireproof bricks.

[0020] The beneficial effects of the present invention are:

[0021] (1) The material corrosion testing system of the present invention simulates the corrosion system under actual working conditions through the corrosion simulation system, realizes semi-automatic start-stop sampling through the sample extraction system, and can simultaneously carry out corrosion experiments of different lengths of time, greatly reducing the impact of the external environment on the experimental samples during the experiment.

[0022] (2) This system is equipped with a vacuum isolation chamber to achieve vacuum insulation sealing. While ensuring excellent thermal insulation, it greatly reduces the size of the system. Compared with the traditional asbestos insulation structure, it is more convenient, safer and more reliable.

[0023] (3) The material corrosion testing system of the present invention can realize single or multiple corrosion experiments at the same time, reducing the impact of the external environment on the experiment. The operation is simple and efficient, and the experiment can be started and stopped intelligently, while also ensuring the personal safety of the experimenters. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an overall schematic diagram of a material corrosion testing system of the present invention;

[0025] Figure 2 It is a schematic top view of a sample rack of a material corrosion testing system of the present invention.

[0026] In the figure, 1-stepping motor, 2-motor chamber, 3-connecting piece, 4-control line sealing port, 5-locking buckle, 6-electromagnet, 7-sample rack buffer chamber, 8-vacuum joint, 9-filling port, 10-gate valve, 11-heat dissipation flange, 12-connecting pipe, 13-vacuum isolation chamber, 14-corrosion tank, 15-sample rack, 16-thermocouple, 17-base, 18-heating wire, 19-electrode flange. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] like Figure 1-2 As shown, a material corrosion testing system includes a stepper motor 1, a motor chamber 2, a connector 3, a control line sealing port 4, a locking buckle 5, an electromagnet 6, a sample rack buffer chamber 7, a vacuum joint 8, an inflation port 9, a plug valve 10, a heat dissipation flange 11, a connecting pipe 12, a vacuum isolation chamber 13, a corrosion tank 14, a sample rack 15, a thermocouple 16, a base 17, a heating wire 18, and an electrode flange 19.

[0029] See also Figure 1The present invention provides a material corrosion testing system, including a sample extraction system, a sample rack buffer chamber 7, a vacuum isolation chamber 13 and a corrosion simulation system; the sample rack buffer chamber 7 and the vacuum isolation chamber 13 are connected, and the corrosion simulation system is arranged inside the vacuum isolation chamber 13. Among them, the sample extraction system is used to control the movement of the sample, the sample rack buffer chamber 7 is used to exchange the sample, the vacuum isolation chamber 13 is used for vacuum insulation, and the corrosion simulation system is used to simulate the corrosion environment.

[0030] Wherein, the sample extraction system includes a controller (not shown), a stepper motor 1 and an electromagnet 6, wherein the controller is connected to the stepper motor 1, and the stepper motor 1 is connected to the electromagnet 6; the stepper motor 1 is connected to the electromagnet 6 via a hose line, and the length of the hose should ensure that it can touch the top of the sample rack 15 when fully extended. In the embodiment, the length is set to 50 cm. The electromagnet 6 can raise the sample rack after being energized.

[0031] The corrosion simulation system includes a corrosion tank 14, a heating system and a sample rack 15. The heating system includes a base 17 and a heating wire 18 embedded in the base. The corrosion tank 14 is placed on the base 17; the sample rack 15 is located in the corrosion tank 14. The base 17 in this embodiment is a concave base 17, and the corrosion tank 14 is an independent tank, which is directly placed in the concave part of the base 17 with the heating wire 18 embedded in it. Figure 1 The sample holder 15 includes a sample holder head, a connecting rod and a bottom film. The sample holder 15 head is made of electromagnetic material, and the part in contact with the liquid metal (bottom film) is made of metal molybdenum. Preferably, baffles are provided on both sides of the bottom film, and the baffles are also made of metal molybdenum.

[0032] Preferably, the sample extraction system further comprises a motor chamber 2, the stepper motor 1 is located in the electrode chamber 2, and the motor chamber 2 and the sample rack buffer chamber 7 are connected via a connector 3. The connector 3 in this embodiment is a connecting hinge; the connecting hinge connects the motor chamber 2 to the sample rack buffer chamber 7, and the motor chamber 2 is provided to protect the stepper motor, prevent the material corrosion test system of the present invention from being corroded during use, and extend its service life.

[0033] Preferably, the material corrosion testing system further comprises a locking buckle 5, and the locking buckle 5 is used to lock and seal the motor chamber 2 and the sample rack buffer chamber 7. It should be noted that the connector 3 only fixes the position of the motor chamber 2 and the sample rack buffer chamber 7, and mainly locks and seals the motor chamber 2 and the sample rack buffer chamber 7 through the locking buckle 5. The connector 3 connects the motor chamber 2 and the sample rack buffer chamber 7, and at the same time locks and seals the motor chamber 2 and the sample rack buffer chamber 7 through the locking buckle 5, so that the internal vacuum degree reaches the required vacuum degree (for example, 1E-4Pa).

[0034] Preferably, the controller is located outside the motor chamber 2, the controller is connected to the stepper motor 1 via a cable, and a control line sealing port 4 is also provided on the motor chamber 2. In this embodiment, the cable passes through the control line sealing port 4 to connect the stepper motor and the controller.

[0035] Preferably, the side wall of the sample rack buffer chamber 7 is provided with a vacuum joint 8 and an air filling port 9 to avoid the influence of the external environment when changing samples. The vacuum joint 8 is used to connect an external vacuum unit to provide high vacuum to the system during the experiment; the air filling port 9 is used to fill the sample rack buffer chamber 7 with inert gas to prevent sample oxidation when changing samples in the middle of the experiment or sampling at the end of the experiment. In this embodiment, the side wall of the sample rack buffer chamber 7 uses a cF25 vacuum joint 8. The side wall of the sample rack buffer chamber 7 uses a cF25 vacuum joint 8 to avoid the influence of the external environment when changing samples.

[0036] Preferably, the vacuum isolation chamber is a complete circular stainless steel tank.

[0037] Preferably, a connecting pipe 12 is provided between the vacuum isolation chamber 13 and the sample rack buffer chamber 7, and the interior of the connecting pipe is in a high vacuum state during the experiment. The connecting pipe is provided so that the vacuum isolation chamber 13 and the sample rack buffer chamber 7 are kept in the same vacuum state under the action of the vacuum unit.

[0038] Preferably, a gate valve 10 is provided between the sample rack buffer chamber 7 and the vacuum isolation chamber 13, the lower end of the sample rack buffer chamber 7 is connected to the gate valve 10, the top of the vacuum isolation chamber 13 is connected to the gate valve 10, and the top of the corrosion tank 14 is connected to the gate valve 10. The gate valve 10 isolates and seals the vacuum isolation chamber 13 and the corrosion tank 14 at the same time, and only when the gate valve is opened, the corrosion tank 14 is connected to the sample rack buffer chamber 7. The sample rack buffer chamber 7 is used to exchange samples, and its lower end is connected to the gate valve 10 to form a sealed chamber.

[0039] Preferably, a heat dissipation flange 11 is provided between the gate valve 10 and the vacuum isolation chamber 13. The heat dissipation flange 11 is provided to prevent the bottom heat from being transferred to the gate valve 10, thereby preventing the gate valve 10 from being damaged by excessive temperature. In this embodiment, the diameter of the heat dissipation flange 11 is 34 cm.

[0040] Preferably, a thermocouple 16 for detecting temperature is connected to the center of the base 17, and the thermocouple 16 is connected to the controller through an electrode flange 19 to achieve temperature control and automated experiment. The corrosion tank 14 is directly placed on the base 17, a heating wire 18 is embedded in the base, and a thermocouple 16 is connected to the center to detect temperature.

[0041] Preferably, the bottom film of the sample holder 15 is a hollow tip structure. The bottom film of the sample holder 15 is covered with a hollow tip, which greatly reduces the contact area with the sample. Figure 1 and Figure 2 The bottom film in this embodiment includes a hollow base and a tip portion fixed on the base. The hollow base can be designed into a variety of hollow forms; the width of the top of the tip portion is smaller than the width of the bottom of the tip portion (the position connected to the hollow base). Preferably, the tip structure can be a planar triangle or a three-dimensional cone. Among them, the shape of the top tip of the tip portion can be a planar tip, or a three-dimensional conical tip, preferably a planar tip. The present invention sets the sample holder 15 as a hollow tip structure, which greatly reduces the contact area between the sample holder 15 and the test sample, ensures the integrity of the corrosion of the experimental sample, and increases the reliability of the experimental data. Therefore, the material corrosion testing system of the present invention is particularly suitable for liquid metal corrosion testing.

[0042] At the same time, in order to ensure that no other variables are introduced into the experiment, the sample rack 15 and the corrosion tank body used are made of molybdenum metal. The base is made of fireproof bricks, which is economical and practical.

[0043] The following is a further description of the method for using the material corrosion testing system of the present invention in conjunction with the accompanying drawings:

[0044] ①Open the gate valve, place the sample on the sample rack, place the sample rack in the corrosion tank through the stepper motor, seal the motor chamber and the sample rack buffer chamber by locking the bayonet, and connect an external leak detector to the vacuum joint for leak detection.

[0045] ② After confirming that the system is leak-free, connect the vacuum unit and turn on the heating wire to bake the corrosion tank and sample rack. The temperature is set to 500℃ and the baking time is 5 hours. The temperature and baking time are determined according to the experimental needs. The purpose of baking the sample rack in the corrosion tank in this step is to remove moisture, because the corrosion experiment is sensitive to moisture and impurity gases, which need to be removed.

[0046] ③ Take out the sample rack, put the required experimental material (liquid metal) in an argon atmosphere, and suspend the sample rack with the sample in the sample rack buffer chamber under the action of an electromagnet, and draw the vacuum to 1E-4Pa; set the temperature according to the experimental conditions and start heating. When the temperature reaches the set temperature, the stepper motor automatically lowers the sample rack to the bottom. At this time, the external control starts timing, the experiment starts, and the gate valve is closed to prevent lithium vapor from moving up and contaminating the motor chamber. The experimental material in this embodiment is a metal lithium ingot.

[0047] ④ During the experiment, when the plug valve is closed, the corrosion tank is an independent space, the vacuum isolation chamber and the sample holder buffer chamber are an independent space, and the vacuum degree is above 1E-4Pa, which is sufficient to provide thermal insulation effect.

[0048] ⑤ When the experiment is for corrosion conditions of different time periods, when one group of experiments is completed, close the vacuum joint, fill the system with 1 kg of argon through the inflation port, open the gate valve, select the finished experimental sample rack and lift it up through the stepper motor, close the gate valve, and directly take out the sample for processing.

[0049] ⑥ When the sample at the end of the experiment is taken away, seal the buffer chamber of the sample rack, close the inert gas filling port, connect the vacuum unit to start vacuuming, and open the gate valve at the same time to make all spaces connected. After the vacuum degree is drawn to above 1E-4Pa, close the gate valve. At this time, the mid-term sampling is completed and the subsequent experiment can continue.

[0050] ⑦ When all experiments are completed, the operation is the same as step ⑤ above. If the liquid metal used in the experiment remains unchanged, the liquid corrosion metal used in the experiment can be reused because there is no external environmental interference in the entire experiment.

[0051] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0052] The parts not elaborated in detail in the description of the present invention belong to the known technology in the art. The above embodiments are provided only for the purpose of describing the present invention, and are not intended to limit the scope of the present invention. The scope of the present invention is defined by the appended claims. Various equivalent substitutions and modifications made without departing from the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A material corrosion testing system, characterized in that: It includes a sample extraction system, a sample rack buffer chamber, a vacuum isolation chamber and a corrosion simulation system; the sample rack buffer chamber and the vacuum isolation chamber are connected, and the corrosion simulation system is arranged inside the vacuum isolation chamber; Wherein, the sample extraction system comprises a controller, a stepper motor and an electromagnet, the controller is connected to the stepper motor, and the stepper motor is connected to the electromagnet; The corrosion simulation system comprises a corrosion tank, a heating system and a sample rack, wherein the heating system comprises a base and a heating wire embedded in the base, and the corrosion tank is directly placed on the base; The stepper motor of the sample extraction system drives the electromagnet to move up and down, thereby driving the movement of the sample rack.

2. The material corrosion testing system according to claim 1, characterized in that: The sample extraction system further comprises a motor chamber, the stepper motor is located in the electrode chamber, and the motor chamber and the sample rack buffer chamber are connected via a connector; The material corrosion testing system also includes a locking buckle, which is used to lock and seal the motor chamber and the sample holder buffer chamber.

3. The material corrosion testing system according to claim 2, characterized in that: The stepper motor is connected to an external controller via a cable, and a control line sealing port is also arranged on the motor chamber.

4. The material corrosion testing system according to claim 1, characterized in that: The side wall of the sample rack buffer chamber is provided with a vacuum joint and an air filling port.

5. The material corrosion testing system according to claim 1, characterized in that: A communicating pipeline is arranged between the vacuum isolation chamber and the sample rack buffer chamber.

6. The material corrosion testing system according to claim 1, characterized in that: A gate valve is arranged between the sample rack buffer chamber and the vacuum isolation chamber, the lower end of the sample rack buffer chamber is connected to the gate valve, the top of the vacuum isolation chamber is connected to the gate valve, and the top of the corrosion tank is connected to the gate valve.

7. The material corrosion testing system according to claim 6, characterized in that: A heat dissipation flange is also provided between the gate valve and the vacuum isolation chamber.

8. The material corrosion testing system according to claim 1, characterized in that: A thermocouple for detecting temperature is connected at the center of the base, and the thermocouple is connected to a controller via an electrode flange.

9. The material corrosion testing system according to claim 1, characterized in that: The bottom film of the sample holder is a hollow tip structure.

10. The material corrosion testing system according to any one of claims 1 to 9, characterized in that: The bottom plate of the sample rack and the corrosion tank are both made of molybdenum metal, and the base is made of fireproof bricks.

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