A corrosion performance testing system for metallic materials

Abstract

This invention relates to a system for testing the corrosion performance of metallic materials. A stress loading device is mounted on the top plate of a test frame, with one end connected to one end of a metal sample and the other end connected to the bottom plate of the test frame. The stress loading device applies external force to the metal sample to simulate its actual stress conditions. In this invention, a temperature control device is thermally connected to the metal sample to provide a high-temperature environment. The outlet of a jet sprayer is directed towards the metal sample to spray corrosive gases, simulating real atmospheric and marine environments. The stress loading device, temperature control device, and jet sprayer can simulate a thermo-mechanical-chemical coupled environment, mimicking real-world usage scenarios for metallic materials. This allows for the investigation of the effects of the coupling of temperature, stress, and corrosive gases on the corrosion performance of metals, thereby comprehensively testing the corrosion resistance of metallic materials in complex corrosive environments.

Description

Technical Field

[0001] This invention relates to the field of metal corrosion performance testing technology, and in particular to a metal corrosion performance testing system. Background Technology

[0002] The corrosion of metallic materials causes enormous losses every year and can even lead to serious safety accidents. The corrosion of boiler pipe materials in extreme high temperature and high pressure environments is a problem that cannot be ignored, especially for high temperature and high pressure equipment operating in marine environments, where the problem is even more prominent.

[0003] Currently, there are various systems and methods for studying the high-temperature corrosion performance of metallic materials, but they are mostly focused on a single factor. However, due to the complexity and variability of the factors causing corrosion, it is extremely difficult to study the corrosion performance of metallic materials under coupled environmental conditions. How to effectively couple multiple corrosion factors remains a challenge for researchers. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a metal material corrosion performance testing system, which studies the corrosion performance of metal materials by coupling multiple factors, and solves the technical problem of the difficulty in studying the corrosion performance of metal materials under coupled environment in the prior art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides a system for testing the corrosion performance of metallic materials, the specific technical solution of which is as follows:

[0008] A corrosion performance testing system for metallic materials, comprising:

[0009] Test rack;

[0010] The stress loading device is located on the top plate of the test frame, with one end connected to one end of the metal sample and the other end of the metal sample connected to the bottom plate of the test frame.

[0011] The temperature control device is connected to the metal sample via thermal conduction to provide a high-temperature environment for the metal sample.

[0012] The jetting device, with its outlet pointed towards the metal sample, is used to spray corrosive gas onto the metal sample.

[0013] Furthermore, the stress loading device includes strain gauges, linear motion units, and strain meters;

[0014] The linear motion unit is mounted on the test frame, and its power output end is connected to the metal sample.

[0015] The strain gauge is adhered to the surface of the metal sample and electrically connected to the strain gauge, which is used to receive stress change information of the metal sample detected by the strain gauge.

[0016] Furthermore, the linear motion unit includes a screw and a nut;

[0017] The nut is located on the top plate of the test frame. The screw passes through the top plate, with one end connected to the metal sample and the other end screwed onto the nut.

[0018] Furthermore, the temperature control device includes a tubular furnace, thermocouples, and a temperature controller;

[0019] The tube furnace is vertically mounted on the base plate of the test frame, and the metal sample is placed inside the furnace chamber.

[0020] Thermocouples are installed on the tube furnace and electrically connected to the temperature controller to measure the temperature of the tube furnace.

[0021] Furthermore, the tubular furnace is also nested with corundum tubes, which are used to protect the tubular furnace.

[0022] Furthermore, the jetting device includes an air pump, an evaporator, and a liquid cylinder;

[0023] The air pump is connected to the bottom air inlet of the evaporator through a gas pipeline, and the liquid cylinder is connected to the liquid inlet of the condenser through a liquid pipeline. The liquid cylinder is used to hold corrosive liquids.

[0024] The outlet end of the evaporator is connected to the lumen of the corundum tube;

[0025] A switch valve is also installed on the gas pipeline to control the connection and disconnection of the air pump and the evaporator.

[0026] Furthermore, the evaporator includes condenser tubes and a water supply device;

[0027] The condenser tube includes an evaporation chamber and a heat circulation chamber, with the heat circulation chamber arranged around the outer periphery of the evaporation chamber;

[0028] The bottom of the evaporation chamber is connected to both a gas pipeline and a liquid pipeline, and the top outlet of the evaporation chamber is connected to the inside of the tubular furnace.

[0029] The water supply device is connected to the hot circulation chamber and is used to supply hot water to the hot circulation chamber.

[0030] Furthermore, a flow meter is installed on the gas pipeline to regulate the gas flow rate of the air pump.

[0031] Furthermore, an adapter is provided at the outlet end of the evaporation chamber. The adapter passes through the base plate and is at least partially placed inside the cavity of the corundum tube.

[0032] Furthermore, the corrosive liquid is an aqueous solution, NaCl solution, Na2SO4 solution, HCl solution, H2SO4 solution, or a mixture of the above solutions.

[0033] (III) Beneficial Effects

[0034] The metal material corrosion performance testing system disclosed in this invention can effectively solve the shortcomings of the prior art.

[0035] The metal corrosion performance testing system provided by this invention includes a stress loading device mounted on the top plate of the test frame. One end of the stress loading device is connected to one end of the metal sample, while the other end of the metal sample is connected to the bottom plate of the test frame. The stress loading device can apply external force to the metal sample to simulate its actual stress conditions. In this invention, a temperature control device is thermally connected to the metal sample to provide a high-temperature environment. The outlet of the jet sprayer is pointed towards the metal sample to spray corrosive gases, simulating real atmospheric and marine environments.

[0036] This invention simulates a thermo-mechanical-chemical coupled environment by setting up a stress loading device, a temperature control device, and a jetting device to simulate the real-world application scenarios of metallic materials. This allows for the investigation of the effects of temperature, stress, and corrosive vapor coupling on the corrosion performance of metals, and ultimately, a comprehensive test of the corrosion resistance of metallic materials in complex corrosive environments. Attached Figure Description

[0037] The accompanying drawings, which are provided to further illustrate this application, constitute a part of this application.

[0038] The illustrative embodiments and descriptions in this application are used to explain this application and do not constitute a limitation thereof.

[0039] Inappropriate limitations are shown in the attached diagram:

[0040] Figure 1 This is a schematic diagram of the structure of the metal material corrosion performance testing system in a specific implementation embodiment;

[0041] Figure 2 This is a structural schematic diagram of the test frame, stress loading device, and temperature control device in a specific implementation embodiment;

[0042] Figure 3 This is a schematic diagram of the jet device in a specific embodiment.

[0043] [Explanation of Labels in the Attached Image]

[0044] 1. Test frame; 110. Top plate; 120. Bottom plate; 130. Support column;

[0045] 2. Stress loading device; 210. Linear movement unit; 211. Screw; 212. Nut;

[0046] 220. Strain gauge; 230. Strain meter;

[0047] 3. Temperature control device; 310. Thermocouple; 320. Temperature controller; 330. Tube furnace; 340. Corundum tube;

[0048] 4. Jet jet device; 410. Air pump; 420. Switch valve; 430. Flow meter; 440. Liquid cylinder;

[0049] 450. Evaporator; 451. Condenser; A. Evaporation chamber; B. Heat circulation chamber;

[0050] 452. Water supply device; 453. Adapter;

[0051] 5. Metal samples. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this invention clearer, the following will describe them in conjunction with the advantages of this invention.

[0053] The accompanying drawings of selected embodiments provide a more detailed description of the technical solutions in the embodiments of the present invention. Throughout the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. The described embodiments are some, but not all, embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are protected by the present invention.

[0054] The scope of protection of this invention is as follows. The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the description of this embodiment, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this embodiment and simplifying the description, and are not intended to indicate or imply that the system or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this embodiment.

[0055] See Figures 1 to 3According to an embodiment of this application, a metal material corrosion performance testing system includes a test frame 1, a stress loading device 2, a temperature control device 3, and a jetting device 4. The stress loading device 2 is mounted on the top plate 110 of the test frame 1, with one end connected to one end of a metal sample 5, and the other end of the metal sample 5 connected to the bottom plate 120 of the test frame 1. The temperature control device 3 is thermally connected to the metal sample 5 to provide a high-temperature environment for the metal sample 5. The jetting device 4 has its outlet pointed towards the metal sample 5 and is used to spray corrosive gas onto the metal sample 5.

[0056] It should be noted that before testing metal sample 5, it is necessary to polish metal sample 5 with sandpaper of different grits to make the surface roughness of metal sample 5 consistent. After polishing, it should be cleaned with acetone and dried to remove the oxide layer on the surface of metal sample 5.

[0057] It is understood that the stress loading device 2 in this embodiment is used to apply external force to the metal sample 5. The metal sample 5 will deform under the action of external force so that the metal sample 5 can maintain the stress state for a long time, thereby simulating the real use scenario of the metal sample 5, so as to study the effect of stress on the corrosion performance of metal materials.

[0058] The temperature control device 3 in this embodiment can provide a high-temperature environment for the metal sample 5, simulate the high-temperature use scenario of the metal material, and then study the influence of the high-temperature environment on the corrosion performance of the metal material.

[0059] In this embodiment, the jetting device 4 can spray corrosive gas onto the surface of the metal sample 5 to investigate the requirements of the corrosive gas on the corrosion performance of the metal material.

[0060] In this embodiment, the metal material corrosion performance testing system has the characteristics of simple structure, easy operation and low cost. It can provide stress, high temperature or corrosion environment for metal materials. It can test the corrosion performance of metal sample 5 in a single environment, or it can combine the thermo-mechanical-chemical coupled environment to explore the influence of temperature, stress and corrosive gas coupling effect on metal corrosion performance.

[0061] Specifically, in this embodiment, the top plate 110 and the bottom plate 120 of the test frame 1 are connected by multiple support columns 130, and the metal sample 5 is fixed to the bottom plate 120 by a pin. The top plate 110, the bottom plate 120, the multiple support columns 130 and the pin are all made of high-strength steel. High-strength steel can withstand high temperatures, corrosion, and has high strength, which further improves the stability and service life of the metal material corrosion performance testing system.

[0062] Furthermore, such as Figure 2As shown, the stress loading device 2 in this embodiment includes a strain gauge 220, a linear movement unit 210, and a strain gauge 230. The linear movement unit 210 is mounted on the top plate 110 of the test frame 1, and its power output end is connected to the metal sample 5. The linear movement unit 210 can pull the metal sample 5, applying an external force to it. The strain gauge 220 is adhered to the surface of the metal sample 5 and electrically connected to the strain gauge 230. The strain gauge 220 detects the stress information of the metal sample 5 and transmits the stress to the strain gauge 230, which collects and displays the stress. The movement distance of the linear movement unit 210 can be adjusted based on the displayed stress information, thereby controlling the magnitude of the external force acting on the metal sample 5.

[0063] It should be noted that the linear motion unit 210 in this embodiment can be controlled automatically or manually. When in automatic control mode, the linear motion unit 210 is preferably any one of a ball screw, rack and pinion, electric cylinder, pneumatic cylinder, or hydraulic cylinder. The linear motion unit 210 is connected to the strain gauge 230, through which stress information can be input. The strain gauge 230 controls the linear motion unit 210 to move a corresponding distance based on the stress information.

[0064] In manual control mode, the movement distance of the moving unit can be adjusted in real time by observing the specific stress value displayed by the strain gauge 230. The linear moving unit 210 corresponds to a screw 211 and nut 212 structure. The nut 212 is located on the top plate 110 of the test frame 1. The screw 211 passes through the top plate 110, with its bottom end connected to the metal sample 5 and its top end screwed into the nut 212. The top end of the screw 211 is also provided with a screwing handle. By screwing the screw 211 through the screwing handle, the screw 211 moves upward relative to the test frame 1, applying a vertical upward tension to the metal sample 5. When the stress value displayed by the strain gauge 230 reaches the set value, the screwing stops, so that the metal sample 5 is under stress for a long time, simulating the real use scenario of metal materials, and thus studying the stress on the corrosion performance of metals.

[0065] Specifically, such as Figure 1 and Figure 2 As shown, the temperature control device 3 in this embodiment includes a tube furnace 330, a thermocouple 310, and a temperature controller 320. The tube furnace 330 is vertically mounted on the base plate 120 of the test frame 1. The metal sample 5 is placed inside the furnace cylinder of the tube furnace 330. The thermocouple 310 is mounted on the outer wall of the tube furnace 330 and electrically connected to the temperature controller 320. The thermocouple 310 is used to measure the temperature information of the tube furnace 330 in real time and transmit the temperature information to the temperature controller 320. The temperature controller 320 controls the tube furnace 330 to start or stop based on the received temperature information to provide a high-temperature environment for the metal sample 5.

[0066] In this embodiment, the strain gauge 220 is adhered to the side where the metal sample 5 is connected to the screw 211. The strain gauge 220 is located outside the tube furnace 330 and is set at least 50mm above the upper surface of the tube furnace 330 to avoid damage to the strain gauge 220 by the high temperature and corrosive environment, thereby ensuring the accuracy of the stress information detected by the strain gauge 220 and extending its service life.

[0067] The tube furnace 330 in this embodiment is used to provide a high-temperature environment for the metal sample 5. The temperature range is from room temperature to 1300°C, which can be used to investigate the effect of temperature on the corrosion performance of the metal material.

[0068] Furthermore, the tubular furnace 330 is also nested with a corundum tube 340, which is used to protect the tubular furnace 330. The corundum tube 340 has good corrosion resistance and can prevent corrosive gases from causing corrosion damage to the tubular furnace 330, thereby further improving the service life of the tubular furnace 330.

[0069] like Figure 3 As shown, the jet device 4 in this embodiment includes an air pump 410, an evaporator 450, and a liquid cylinder 440. The air pump 410 is connected to the bottom air inlet of the evaporator 450 via a gas pipeline, and the liquid cylinder 440 is connected to the liquid inlet of the evaporator 450 via a liquid pipeline. The liquid cylinder 440 is used to hold corrosive liquids. The outlet end of the evaporator 450 is connected to the interior of the corundum tube 340. A switch valve 420 is also provided on the gas pipeline, which is used to control the connection and disconnection of the air pump 410 and the evaporator 450.

[0070] The corrosive liquid in the liquid cylinder 440 is added to the evaporator 450 using the principle of communicating vessels. The liquid level in the evaporator 450 can be adjusted by adjusting the height of the corrosive liquid in the liquid cylinder 440. The evaporator 450 is used to evaporate the corrosive liquid to obtain corrosive gas.

[0071] Air pump 410 is used to blow air into evaporator 450. The air is used to blow corrosive gas into corundum tube 340 to provide a corrosive environment for metal sample 5, thereby analyzing the effect of the chemical environment on the corrosion performance of the metal material. The air is also used to mix with the corrosive gas to change the concentration of the mixed gas.

[0072] Furthermore, a flow meter 430 is also installed on the gas pipeline in this embodiment. The flow meter 430 is used to detect the gas flow rate of the air pump 410. By controlling the amount of air pump 410 blown into the evaporator 450, the concentration of corrosive gas can be adjusted to analyze the corrosion performance of metal materials by different concentrations of corrosive gas.

[0073] Specifically, as shown in Figure 4, the evaporator 450 of this embodiment includes a condenser tube 451 and a water supply device 452. The condenser tube 451 includes an evaporation chamber A and a heat circulation chamber B. The heat circulation chamber B is arranged around the outer periphery of the evaporation chamber A and is connected to the water supply device 453, which is used to add hot water to the heat circulation chamber B. Gas pipes and liquid pipes are respectively connected to the bottom inlet of the evaporation chamber A. An adapter 453 is also provided at the top outlet of the evaporation chamber A. The adapter 453 is inserted into the base plate 120 and is at least partially placed in the cavity of the corundum tube 340 for spraying corrosive gas into the cavity of the corundum tube 340. The adapter 454 is made of high-temperature and corrosion-resistant quartz stone, which is not easily damaged in high-temperature and high-corrosion environments, thereby extending the service life of the evaporator 450.

[0074] The evaporation process of the corrosive liquid is as follows: the corrosive liquid flows into the evaporation chamber A through the liquid pipe, and hot water is added to the hot circulation chamber B through the water supply device 453 from the inlet of the hot circulation chamber B. The hot water flows in the hot circulation chamber B and flows out from the outlet. The temperature in the evaporation chamber A rises, and the corrosive liquid evaporates into corrosive gas. Then, the air pump 410 blows air into the evaporation chamber A, and blows the corrosive gas into the cavity of the corundum tube 340 to provide a corrosive environment for the metal sample 5.

[0075] Specifically, the corrosive liquid in this embodiment can be pure water or NaCl solution, Na2SO4 solution, HCl solution, H2SO4 solution, etc. of various concentrations, or a mixed solution mixed in various proportions. It can simulate marine environment, atmospheric environment and strong acid and strong alkali environment to study the corrosion resistance of metallic materials in chemical environment.

[0076] The above describes the specific structure of the metal material corrosion performance testing system in this embodiment. It is used to detect the corrosion performance of metal materials. After the corrosion test of metal sample 5 is completed, when the temperature returns to room temperature, metal sample 5 is taken out and subjected to phase analysis, surface and cross-sectional morphology analysis and energy dispersive spectroscopy analysis to obtain metallographic information of metal sample 5 after corrosion test. In this way, the influence of the coupling effect of temperature, stress and corrosive gas on the corrosion performance of metal materials can be explored, so as to comprehensively test the corrosion resistance of metal materials in complex corrosive environments.

[0077] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, are covered within the scope of protection of the present invention.

Claims

1. A system for testing the corrosion performance of metallic materials, characterized in that, include: Test rack (1); The stress loading device (2) is located on the top plate (110) of the test frame (1), with one end connected to one end of the metal sample (5) and the other end of the metal sample (5) connected to the bottom plate (120) of the test frame (1). Temperature control device (3) is thermally connected to the metal sample (5) to provide a high-temperature environment for the metal sample (5); The jetting device (4) is positioned with its outlet pointing towards the metal sample (5) and is used to spray corrosive gas onto the metal sample (5). The jetting device (4) includes an air pump (410), an evaporator (450), and a liquid cylinder (440). The evaporator (450) includes a condenser (451) and a water supply device (452). The air pump (410) is connected to the bottom air inlet of the evaporator (450) through a gas pipeline, and the liquid cylinder (440) is connected to the liquid inlet of the condenser (451) through a liquid pipeline. The liquid cylinder (440) is used to hold corrosive liquids. The condenser tube (451) includes an evaporation chamber (A) and a heat circulation chamber (B), the heat circulation chamber (B) being arranged around the outer periphery of the evaporation chamber (A).

2. The metal material corrosion performance testing system according to claim 1, characterized in that, The stress loading device (2) includes a strain gauge (220), a linear motion unit (210), and a strain meter (230). The linear motion unit (210) is mounted on the test frame (1), and its power output end is connected to the metal sample (5); The strain gauge (220) is adhered to the surface of the metal sample (5) and electrically connected to the strain gauge (230). The strain gauge (230) is used to receive the stress change information of the metal sample (5) detected by the strain gauge (220).

3. The metal material corrosion performance testing system according to claim 2, characterized in that, The linear motion unit (210) includes a screw (211) and a nut (212); The nut (212) is located on the top plate (110) of the test frame (1), and the screw (211) passes through the top plate (110), with one end connected to the metal sample and the other end screwed onto the nut (212).

4. The metal material corrosion performance testing system according to claim 1, characterized in that, The temperature control device (3) includes a tube furnace (330), a thermocouple (310), and a temperature controller (320). The tubular furnace (330) is vertically mounted on the base plate (120) of the test frame (1), and the metal sample (5) is placed inside the furnace cavity of the tubular furnace (330). The thermocouple (310) is mounted on the tubular furnace (330) and electrically connected to the temperature controller (320) for measuring the temperature of the tubular furnace (330).

5. The metal material corrosion performance testing system according to claim 4, characterized in that, The tubular furnace (330) is also nested with a corundum tube (340), which is used to protect the tubular furnace (330).

6. The metal material corrosion performance testing system according to claim 5, characterized in that, The outlet end of the evaporator (450) is connected to the lumen of the corundum tube (340); A switch valve (420) is also provided on the gas pipeline, which is used to control the connection and disconnection between the air pump (410) and the evaporator (450).

7. The metal material corrosion performance testing system according to claim 6, characterized in that, The bottom of the evaporation chamber (A) is connected to the gas pipe and the liquid pipe respectively, and the top outlet of the evaporation chamber (A) is connected to the inside of the tubular furnace (330); The water supply device (452) is connected to the hot circulation chamber (B) and is used to supply hot water to the hot circulation chamber (B).

8. The metal material corrosion performance testing system according to claim 6, characterized in that, A flow meter (430) is also installed on the gas pipeline, which is used to regulate the gas flow rate of the air pump (410).

9. The metal material corrosion performance testing system according to claim 7, characterized in that, The outlet end of the evaporation chamber (A) is also provided with an adapter (453), which passes through the base plate (120) and is at least partially placed inside the cavity of the corundum tube (340).

10. The metal material corrosion performance testing system according to claim 6, characterized in that, The corrosive liquid is an aqueous solution, NaCl solution, Na2SO4 solution, HCl solution, H2SO4 solution, or a mixture of the above solutions.

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