High and low temperature corrosion environment system
The high and low temperature corrosion environment system with dual heating and cooling modes solves the problems of lack of low temperature range and uneven temperature control in traditional equipment, and achieves temperature range control of -20 to 300℃, which improves the reproducibility and safety of the test and is suitable for stress corrosion testing of metallic materials.
Patent Information
- Application Number
- CN202520579959.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-03-06
- Estimated Expiration
- 2035-03-31
AI Technical Summary
Traditional stress corrosion testing equipment cannot simulate low-temperature corrosion conditions ranging from -20°C to 0°C in frigid regions or extreme conditions of >250°C in high-temperature steam pipelines. It lacks temperature control accuracy and has poor data comparability between different devices, resulting in high testing costs and complex result analysis.
The high and low temperature corrosion environment system adopts a dual-mode automatic switching of heating and cooling, combined with corrosion-resistant materials and a closed-loop temperature control system, to achieve temperature range control of -20 to 300℃. The temperature of the corrosion liquid is balanced by a spiral flow design, and the flow speed is adjusted by a DC motor-driven corrosion liquid circulation pump to stabilize the temperature.
It achieves high-precision temperature control over a wide temperature range, improves the reproducibility and safety of the test, reduces equipment costs, and is suitable for reliability assessment of metallic materials in extreme environments.
Smart Images
Figure CN223977084U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of high temperature testing equipment technology, and in particular to a high and low temperature corrosion environment system. Background Technology
[0002] Stress corrosion cracking (SCC) is a brittle fracture phenomenon that occurs in metallic materials under the combined action of tensile stress and a specific corrosive environment. This failure mode is characterized by its suddenness and catastrophic nature. Metallic materials often face the challenge of stress corrosion cracking (SCC) in industrial applications (such as petrochemicals, marine engineering, and aerospace), especially in environments containing corrosive media such as hydrogen sulfide (H2S) and hydrochloric acid (HCl).
[0003] Traditional stress corrosion testing methods (current international standards such as ASTM G36 and ISO 7539) mainly suffer from the following technical bottlenecks:
[0004] (1) Limited temperature range: The operating temperature of conventional test equipment is mostly concentrated in the range of 50-300℃; it cannot simulate the low temperature corrosion conditions of -20℃ to 0℃ in cold regions; it is difficult to reproduce the extreme conditions of deep sea environment (2-5℃) and high temperature steam pipeline (>250℃);
[0005] (2) Insufficient temperature control accuracy: Traditional equipment using resistance heating has a temperature field fluctuation of ±5℃; lack of effective low-temperature cooling means makes it difficult to achieve precise control below 0℃; temperature gradients lead to uneven distribution of corrosive medium concentration, affecting the reproducibility of the test;
[0006] (3) Equipment compatibility issues: A single device cannot simultaneously meet the requirements of high and low temperature tests; the parallel use of multiple devices increases the test cost by more than 300%; the data comparability between different devices is poor, increasing the difficulty of result analysis.
[0007] Therefore, it is necessary to develop a high and low temperature corrosion environment system that covers high and low temperature ranges, is integrated, has high precision, and is highly efficient. Utility Model Content
[0008] The purpose of this invention is to provide a high and low temperature corrosion environment system to solve the problems of traditional stress corrosion testing equipment, such as the lack of a low temperature range, uneven temperature control, and insufficient safety.
[0009] To achieve the above objectives, this utility model provides the following technical solution:
[0010] A high and low temperature corrosion environment system, comprising:
[0011] The corrosion chamber is installed on the tensile testing machine. Its internal cavity is filled with a corrosive liquid, in which metal material samples are immersed.
[0012] The environmental temperature control system is connected to the corrosion chamber via connecting pipes, allowing the corrosion solution to circulate between the corrosion chamber and the environmental temperature control system, ultimately controlling the corrosion solution in the corrosion chamber to stabilize at the designed given value; the environmental temperature control system is equipped with a refrigeration system and a heating system, and the temperature is regulated by a closed-loop control instrument.
[0013] Furthermore, the inlet of the corrosion tank is equipped with a guide seat, and when the corrosive liquid enters the corrosion tank through the guide seat, it is discharged in a downward tilting manner.
[0014] Furthermore, a first temperature sensor is installed on the corrosion chamber to provide real-time feedback of the temperature of the corrosion solution to the temperature control instrument of the environmental temperature control system for closed-loop control, so that the temperature of the corrosion solution remains stable at the set value.
[0015] Furthermore, the corrosion chamber is also equipped with a concentration sensor to display the concentration of the corrosion solution in real time.
[0016] Furthermore, the uppermost part of the corrosion chamber is provided with an overflow port.
[0017] Furthermore, the corrosion chamber has a split-type structure, and silicone rubber seals are embedded on the joint surfaces of the two halves.
[0018] Furthermore, the corrosion chamber has a double-layer structure, with thermal insulation filler filling the space between the inner and outer layers. The inner layer is made of corrosion-resistant Hastelloy C-276 material.
[0019] Furthermore, the environmental temperature control system is equipped with a corrosion liquid circulation pump to drive the circulation of the corrosion liquid.
[0020] Furthermore, the corrosion liquid circulation pump is driven by a DC motor, and the speed control of the DC motor is completed by a DC motor controller. The DC motor controller receives signals from the first temperature sensor in the corrosion chamber and the second temperature sensor in the ambient temperature control system, and adjusts the speed of the DC motor according to the difference between the two, thereby adjusting the circulation flow speed of the corrosion liquid, stabilizing the temperature difference between the corrosion liquid in the corrosion chamber and the temperature of the corrosion liquid in the temperature control tank of the ambient temperature control system, and ultimately accurately controlling the temperature of the corrosion liquid in the corrosion chamber.
[0021] Furthermore, the temperature-regulating barrel is composed of inner and outer barrels, with insulation filler filling the space between them. The inner barrel is made of Hastelloy C-276 material, which is used for internal corrosion. An evaporator of a refrigeration system is installed inside the temperature-regulating barrel to reduce the temperature of the corrosive liquid. A heater is installed on the outer wall of the inner barrel to increase the temperature of the corrosive liquid.
[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0023] 1. The high and low temperature corrosion environment system provided by this utility model adopts automatic switching between heating and cooling modes, covering a range of both high and low temperature environments, and can provide corrosive liquids from -20 to 300°C.
[0024] 2. The high and low temperature corrosion environment system provided by this utility model adopts a flow guiding design when the corrosion liquid enters the corrosion tank, forming a spiral flow in the cylindrical inner cylinder of the corrosion tank, which creates a stirring effect and balances the temperature of the upper and lower layers of the corrosion liquid in the tank.
[0025] 3. The high and low temperature corrosion environment system provided by this utility model, 3. the inner chamber of the corrosion chamber and the inner tank of the temperature control system are both made of corrosion-resistant C-276 material, which improves the service life, avoids metal elements from dissolving into the corrosion liquid, and ensures the purity of the corrosion liquid.
[0026] 4. The temperature regulation of the environmental temperature control system consists of two parts: a cooling component and a heating component. The cooling component and the heating component are controlled by a closed-loop temperature control instrument and complement each other. Therefore, regardless of whether it is a low temperature or a high temperature, the temperature overshoot of the corrosive liquid can be effectively controlled.
[0027] 5. The circulation of the corrosion solution between the corrosion chamber and the ambient temperature control system is accomplished by a corrosion solution circulation pump. The corrosion solution circulation pump is driven by a DC motor with adjustable speed. Based on the feedback signals from the temperature sensor in the corrosion chamber and the temperature sensor in the temperature control tank of the ambient temperature control system, the circulation speed of the corrosion solution is automatically increased or decreased to stabilize the temperature of the corrosion solution in the corrosion chamber at a given value.
[0028] In summary, this invention, through wide-range temperature control technology and corrosion-resistant structural design, solves the problems of traditional stress corrosion testing equipment, such as the lack of a low-temperature range, uneven temperature control, and insufficient safety. It allows for flexible configuration of the temperature range (-20~300℃ (full temperature range)), media type (supporting corrosive solutions such as hydrogen sulfide and hydrochloric acid), and monitoring parameters according to user needs. It is used for stress corrosion tensile testing of metallic materials and is suitable for materials research and development, quality testing, and standards certification. Its high integration, intelligent operation, and low-cost maintenance significantly improve experimental efficiency and reduce overall user costs. It provides an advanced tool for reliability assessment of metallic materials under extreme environments, filling the current technological gap in extreme temperature simulation of stress corrosion testing equipment, and providing a more reliable evaluation method for new material development and engineering material selection. Attached Figure Description
[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.
[0030] Figure 1 This is a schematic diagram of the high and low temperature corrosion environment system provided in an embodiment of the present invention. Figure 1 In the image, (a) is the front view and (b) is the top view.
[0031] Figure 2 This is a schematic diagram of the corrosion chamber provided in an embodiment of the present invention. Figure 2 In the diagram, (a) is the front view, (b) is the side view, and (c) is the top view.
[0032] Figure 3 This is a schematic diagram of the corrosion chamber provided in an embodiment of the present invention. Figure 3 In the diagram, (a) is the front sectional view, (b) is the side view, and (c) is the top view.
[0033] Figure 4 This is a schematic diagram of the flow guide seat provided in an embodiment of the present utility model. Figure 4 In the diagram, (a) is the front view, (b) is the side sectional view, and (c) is the top sectional view.
[0034] Figure 5 This is a schematic diagram of the structure of the environmental control system provided in an embodiment of the present utility model. Figure 5 In the diagram, (a) is the front view, (b) is the side sectional view, and (c) is the top view.
[0035] Figure 6 This is a schematic diagram of the structure of the temperature-regulating barrel provided in an embodiment of the present utility model. Figure 6 In the diagram, (a) is the front view, (b) is the side sectional view, and (c) is the top view. Detailed Implementation
[0036] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.
[0037] This utility model provides a high and low temperature corrosion environment system, such as Figure 1As shown, the system consists of a corrosion chamber 1, an environmental temperature control system 2, and connecting pipes 3. The corrosion chamber 1 is installed around the metal sample and contains a corrosive solution. The metal sample is immersed in the solution, and the temperature of the solution is controllable, placing the metal sample in a temperature-controlled corrosive environment that meets the environmental requirements of stress corrosion testing. The environmental temperature control system 2 regulates the temperature of the corrosive solution to maintain it at the required test value. Connected to the corrosion chamber 1 via the connecting pipes 3, the corrosive solution circulates between the two, ensuring the temperature of the corrosive solution within the chamber remains at the required value.
[0038] The corrosion chamber 1, as Figure 2 As shown, the system consists of a corrosion chamber 1-1, a collection tray 1-2, a first temperature sensor 1-3, and a concentration sensor 1-4. The corrosion chamber 1-1 has a split design, allowing for easy opening and closing. The mating surfaces of the left and right chambers are inlaid with high-temperature and corrosion-resistant silicone rubber sealing strips to seal the corrosion solution. The collection tray 1-2 is located below the corrosion chamber 1-1 to collect any overflowing residual corrosion solution, preventing corrosion on the equipment surface. The sensing probe of the first temperature sensor 1-3 is immersed in the corrosion solution, transmitting the temperature of the solution in real time to the temperature control instrument, forming a closed-loop control to ensure the corrosion solution temperature always follows the set value. The sensing probe of the concentration sensor 1-4 is immersed in the corrosion solution, displaying the concentration of the corrosion solution in real time, guiding the experimenter to adjust the concentration promptly.
[0039] The corrosion chamber 1-1, as Figure 3 As shown, it consists of a shell 1-1-1, insulation packing 1-1-2, connecting seat 1-1-3, box support 1-1-4, corrosive liquid inlet 1-1-5, flow guide seat 1-1-6, corrosive liquid outlet 1-1-7 and overflow port 1-1-8.
[0040] The shell 1-1-1 has an inner and outer layer structure. The inner layer is made of corrosion-resistant C-276 material, which can withstand the corrosion of hydrogen sulfide and hydrochloric acid. The space between the inner and outer layers is filled with thermal insulation filler 1-1-2 to reduce heat transfer between the corrosive liquid and the external environment, thereby reducing the system's energy consumption. The connecting seat 1-1-3 is used to install the box bracket 1-1-4 and the shell 1-1-1. Its lower end is rigidly connected to the loading component of the equipment, and its upper end connects to the clamp and metal material sample. The left and right halves of the shell 1-1-1 are mounted on the box bracket 1-1-4 by hinges, which can be easily opened and closed. The corrosive liquid inlet 1-1-5 is located on the shell 1-1-1. At the top, the corrosive liquid enters the corrosion chamber through the corrosive liquid inlet 1-1-5. After being guided by the guide seat 1-1-6, the corrosive liquid is sprayed at an angle along the inner wall of the corrosion chamber to the bottom, creating a stirring effect. This not only balances the temperature of the upper and lower layers of the corrosive liquid but also prevents the corrosive liquid from splashing outside the corrosion chamber. The corrosive liquid outlet 1-1-7 is located at the bottom of the shell 1-1-1. The corrosive liquid circulates between the corrosion chamber and the ambient temperature control system through the connecting pipeline. The overflow port 1-1-8 is located at the top of the shell 1-1-1. When the corrosive liquid flows in too quickly, the excess corrosive liquid overflows back to the ambient temperature control system, preventing the corrosive liquid from overflowing from the shell 1-1-1.
[0041] As shown in the figure 1-1-6 Figure 4 As shown, it is made of corrosion-resistant C-276 material and has a semi-enclosed inclined groove structure. It is welded to the outlet of the corrosion liquid at 1-1-7. It is used to control the corrosion liquid to spray along the inner wall of the corrosion tank at an inclined angle to the bottom of the tank, so that the corrosion liquid will generate a swirling flow in the corrosion tank to achieve the effect of stirring, thereby achieving the purpose of balancing the temperature of the upper and lower layers of the corrosion liquid, while avoiding the splashing of the corrosion liquid.
[0042] The environmental temperature control system 2, such as Figure 5 As shown, it consists of a housing 2-1, a compressor 2-2, a condenser 2-3, an evaporator 2-4, a temperature regulating tank 2-5, a heater 2-6, a second temperature sensor 2-7, a corrosion liquid circulation pump 2-8, a corrosion liquid outlet 2-9, a corrosion liquid inlet 2-10, a corrosion liquid filling port 2-11, a temperature controller 2-12, and a power switch 2-13.
[0043] The housing 2-1 forms the external framework of the environmental temperature control system, and other functional components are installed inside. The compressor 2-2, condenser 2-3, and evaporator 2-4 constitute the refrigeration component. The evaporator 2-4 is placed inside the temperature-regulating tank 2-5, and its function is to absorb the temperature of the corrosive liquid, creating a low-temperature environment. The heater 2-6 is the heating component, arranged in close contact with the outer wall of the inner layer of the temperature-regulating tank 2-5. It heats the corrosive liquid inside the temperature-regulating tank 2-5 by means of current, causing it to absorb heat and creating a high-temperature environment. The second temperature sensor 2-7 collects the temperature signal of the corrosive liquid inside the temperature-regulating tank 2-5, and the temperature controller 2-12 performs closed-loop control of the refrigeration and heating components. When the temperature of the corrosive liquid is higher than the given value required by the test, the refrigeration component starts to lower the temperature of the corrosive liquid, with the heating component assisting to avoid temperature overshoot. When the temperature of the corrosive liquid is lower than the given value required by the test, the heating component starts to raise the temperature of the corrosive liquid, with the refrigeration component assisting to avoid temperature overshoot. A corrosive liquid circulation pump is also included. Pump 2-8 is used for the circulation of the corrosive liquid between the corrosion chamber and the ambient temperature control system. It is driven by a DC motor, and the circulation speed of the corrosive liquid is adjustable. Its controller collects the temperature signals from the first temperature sensor 1-3 in the corrosion chamber 1 and the second temperature sensor 2-7 in the temperature control tank 2-5 in real time. Based on the difference between the two, it performs closed-loop control of the rotation speed of the corrosive liquid circulation pump 2-8 to keep the circulation speed of the corrosive liquid within a reasonable range. The corrosive liquid outlet 2-9 is located at the bottom of the temperature control tank 2-5, the corrosive liquid inlet 2-10 is located at the top of the temperature control tank 2-5, and the corrosive liquid filling port 2-11 is located above the temperature control tank 2-5 for adding corrosive liquid to the system. The temperature control instrument 2-12 receives the temperature signal of the corrosive liquid in the temperature control tank 2-5 measured by the temperature sensor 2-7, compares it with the given value required by the test, and controls the working status of the cooling and heating components to ensure that the temperature of the corrosive liquid in the temperature control tank 2-5 reaches the given value required by the test. The power switch 2-13 is used to connect to an external power source.
[0044] Specifically, temperature-regulating tanks 2-5, such as Figure 6As shown, the barrel 2-5-1 has an inner and outer layer structure, with insulation material 2-5-2 filling the space between the inner and outer layers to reduce heat conduction between the corrosive liquid inside the barrel and the external environment, thereby reducing the system's energy consumption. The evaporator 2-4 is the heat-absorbing element of the refrigeration component, made of corrosion-resistant C-276 tubing, and is arranged inside the barrel 2-5-1, immersed in the corrosive liquid, to lower the temperature of the corrosive liquid. The heater 2-6 is made of a resistance wire assembly fitted with a ceramic plate, fitted and installed on the outer wall of the inner layer of the barrel 2-5-1. After being energized, it generates heat to raise the temperature of the corrosive liquid inside the temperature-regulating barrel. The temperature of the etching solution; the second temperature sensor 2-7 is vertically installed on the temperature-controlled tank cover, and the temperature probe extends into the temperature-controlled tank 2-5 to measure the temperature signal of the etching solution inside the tank, which is fed back to the temperature control instrument 2-12 in real time. It is the feedback element for the closed-loop control of the etching solution temperature; the etching solution outlet 2-9 is arranged at the bottom of the tank body 2-5-1, and the etching solution inlet 2-10 is arranged at the top of the tank body 2-5-1. The two are connected to the etching tank through connecting pipes; the etching solution filling port 2-11 is arranged at the top of the tank body 2-5-1 for filling the etching solution.
[0045] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A high and low temperature corrosion environment system, characterized by, The utility model relates to a kind of corrosion test device, including: Corrosion tank (1) is installed on tensile testing machine, and internal cavity contains corrosion solution, and metal material sample is soaked therein; Environment temperature control system (2) is connected with corrosion tank (1) by connecting pipeline (3), so that corrosion solution circulates between corrosion tank (1) and environment temperature control system (2), and finally controls corrosion solution in corrosion tank (1) to be stable at the given value designed;The inside of the environment temperature control system (2) is provided with refrigeration system and heating system, and temperature regulation is realized by closed-loop control of temperature control instrument.
2. The high-low temperature corrosion environment system of claim 1, wherein, The liquid inlet of the corrosion tank (1) is provided with a flow guide seat, and the corrosion solution enters the corrosion tank (1) through the flow guide seat in a downward inclined discharge manner.
3. The high-low temperature corrosion environment system of claim 1, wherein, A first temperature sensor is installed on the corrosion tank (1) for real-time feedback of the temperature of the corrosion solution to the temperature control instrument of the environment temperature control system (2) for closed-loop control, so that the temperature of the corrosion solution is always stable at the set given value.
4. The high-low temperature corrosion environment system of claim 1, wherein, A concentration sensor is also installed on the corrosion tank (1) for real-time display of the concentration of the corrosion solution.
5. The high-low temperature corrosion environment system of claim 1, wherein, The uppermost part of the corrosion tank (1) is provided with an overflow port.
6. The high-low temperature corrosion environment system of claim 1, wherein, The tank body structure of the corrosion tank (1) is a split type, and a sealing member made of silicone rubber is embedded in the joint surface of the two halves.
7. The high-low temperature corrosion environment system of claim 1, wherein, The tank body structure of the corrosion tank (1) adopts a double-layer structure, and the inner and outer layers of the tank body are filled with thermal insulation filler, and the inner layer of the tank body is made of corrosion-resistant Hastelloy C-276 material.
8. The high-low temperature corrosion environment system of claim 1, wherein, The environment temperature control system (2) is provided with a corrosion solution circulating pump for driving the circulation of the corrosion solution.
9. The high-low temperature corrosion environment system of claim 8, wherein, The corrosion solution circulating pump is driven by a DC motor, and the speed control of the DC motor is completed by a DC motor controller, which receives the signals of the first temperature sensor in the corrosion tank (1) and the second temperature sensor in the environment temperature control system (2), adjusts the speed of the DC motor according to the difference between the two, and then adjusts the circulation speed of the corrosion solution, so that the temperature difference between the corrosion solution in the corrosion tank (1) and the corrosion solution in the temperature control barrel of the environment temperature control system (2) is stable, and finally the temperature of the corrosion solution in the corrosion tank (1) is accurately controlled.
10. The high-low temperature corrosion environment system of claim 9, wherein, The structure of the temperature control barrel is composed of an inner barrel and an outer barrel, and the inner barrel is made of inner corrosion Hastelloy C-276 material; An evaporator of the refrigeration system is installed in the temperature control barrel for reducing the temperature of the corrosion solution; A heater is installed on the outer wall of the inner barrel for increasing the temperature of the corrosion solution.