System for testing fatigue performance of metal material in corrosion environment

Abstract

The utility model discloses a metal material fatigue performance testing system in a corrosion environment, which comprises a fatigue testing machine, a peristaltic pump, a corrosion pool and a corrosion liquid container, a metal sample vertically penetrates through a central hole on a bottom plate of the corrosion pool, and a middle testing area of the metal sample is soaked in corrosion liquid in the corrosion pool; the two ends of the metal sample are connected with the fatigue testing machine, corrosive liquid is contained in the corrosive liquid container, a liquid inlet of the corrosion pool is connected with the corrosive liquid container through a liquid supply pipe, an overflow port of the corrosion pool is connected with the corrosive liquid container through an overflow pipe, and the peristaltic pump is installed on the liquid supply pipe. According to the utility model, the corrosive liquid circularly flows between the corrosion pool and the corrosive liquid container through the peristaltic pump, the liquid supply pipe and the overflow pipe, so that the test parameters such as pH value, temperature and the like of the corrosive liquid in the corrosion pool are always kept consistent with those of the corrosive liquid container, and the system is beneficial to improving the measurement precision of the test parameters; therefore, the corrosion environment of the metal material can be accurately simulated, and the accuracy of test results is improved.

Description

Technical Field

[0001] The utility model relates to a metal material fatigue performance testing system in a corrosive environment, belonging to the technical field of materials science. Background Art

[0002] The dual effects of corrosion and fatigue of metal materials are the main failure modes of engineering structural materials, especially in the fields of aerospace, marine engineering, nuclear power, etc. The performance evaluation of metal materials in corrosive environments is also increasingly valued in the industry. Traditional single corrosion and fatigue evaluations can no longer meet the needs, and fatigue performance testing in corrosive environments is becoming increasingly important.

[0003] The key to fatigue testing of metal materials in corrosive environments lies in accurately simulating the corrosive environment. Currently, a number of environmental simulation devices for corrosion fatigue testing have been published both domestically and internationally. However, most suffer from issues such as leaks of the corrosive fluid and the inability to monitor test parameters (such as the pH value of the corrosive fluid) in real time, which impacts the accuracy of test results. Therefore, improvements are necessary. Utility Model Content

[0004] The purpose of the present invention is to provide a metal material fatigue performance testing system in a corrosive environment to address the shortcomings of the existing technology, so as to accurately simulate the corrosive environment of the metal material and ensure the accuracy of the test results.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A metal material fatigue performance testing system in a corrosive environment includes a fatigue testing machine, a peristaltic pump, a corrosion tank and a corrosion liquid container. A metal sample vertically passes through the corrosion liquid in the corrosion tank and the central hole on the bottom plate of the corrosion tank, and the middle test area of ​​the metal sample is immersed in the corrosion liquid in the corrosion tank. Both ends of the metal sample are connected to the fatigue testing machine. The corrosion liquid container contains the corrosion liquid. The liquid inlet of the corrosion tank is connected to the corrosion liquid container through a liquid supply pipe. The overflow port of the corrosion tank is connected to the corrosion liquid container through an overflow pipe. The peristaltic pump is installed on the liquid supply pipe.

[0007] The metal material fatigue performance testing system under the above-mentioned corrosive environment also includes an overflow receiving pool and a sealing ring. The corrosion pool is located in the overflow receiving pool. The sealing ring is attached to the lower part of the bottom plate of the overflow receiving pool. The lower end of the metal sample passes through the center hole of the bottom plate of the overflow receiving pool and the sealing ring in sequence.

[0008] The metal material fatigue performance testing system under the above-mentioned corrosive environment also includes a pH meter, which includes a controller head and a corrosion-resistant electrode. The corrosion-resistant electrode is immersed in the corrosive liquid in the corrosive liquid container, and the signal output end of the corrosion-resistant electrode is connected to the controller head.

[0009] The metal material fatigue performance testing system under the above-mentioned corrosive environment also includes a temperature controller, a heating rod and a temperature sensor. The heating rod is located in the corrosive liquid container, and the temperature sensor is installed in the overflow pipe or the corrosive liquid container. The input end of the temperature controller is connected to the temperature sensor, and the output end is connected to the heating rod.

[0010] In the above-mentioned metal material fatigue performance testing system under a corrosive environment, the corrosion pool is a circular pool, the liquid inlet of the corrosion pool is arranged at the lower part of the side wall of the corrosion pool, and the overflow port of the corrosion pool is arranged at the upper part of the side wall of the corrosion pool.

[0011] In the above-mentioned metal material fatigue performance testing system under a corrosive environment, the temperature sensor is a thermocouple.

[0012] In the above-mentioned metal material fatigue performance testing system under a corrosive environment, the liquid supply pipe and the overflow pipe are both corrosion-resistant hoses.

[0013] The utility model circulates the corrosive liquid between the corrosion tank and the corrosion liquid container through a peristaltic pump, a liquid supply pipe and an overflow pipe, thereby ensuring that the pH value, temperature and other test parameters of the corrosive liquid in the corrosion tank are always consistent with those in the corrosion liquid container. The system helps to improve the measurement accuracy of the test parameters, thereby accurately simulating the corrosion environment of the metal material and improving the accuracy of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0015] Figure 1 It is a structural diagram of the present utility model.

[0016] The numbers in the figure are as follows: 1. Peristaltic pump; 2. pH meter; 3. Temperature controller; 4. Heating rod; 5. Corrosion tank; 6. Overflow collection tank; 7. Sealing ring; 8. Liquid supply pipe; 9. Corrosion liquid container; 10. Temperature sensor; 11. Overflow pipe; 12. Metal sample. DETAILED DESCRIPTION

[0017] The present invention aims to improve the accuracy of the test results by providing a fatigue test system for metal materials in a corrosive environment. The system solves the problems of easy leakage of corrosive liquid and inaccurate monitoring of test parameters in traditional corrosion environment simulation devices.

[0018] See Figure 1 The utility model mainly includes a fatigue testing machine (not shown in the figure), a peristaltic pump 1, a pH meter 2, a temperature controller 3, a heating rod 4, a corrosion tank 5, an overflow receiving tank 6, a sealing ring 7, a liquid supply pipe 8, a corrosion liquid container 9, a temperature sensor 10 and an overflow pipe 11.

[0019] The metal sample 12 is installed between the test heads of the fatigue testing machine, and the corrosion pool 5 is sleeved on the outside of the metal sample 12, that is, the metal sample 12 vertically passes through the corrosive liquid in the corrosion pool 5 and the center hole on the bottom plate of the corrosion pool 5. The two ends of the metal sample 12 are connected to the fatigue testing machine. As the metal sample 12 moves synchronously, the corrosive liquid is contained in the corrosive liquid container 9, the liquid inlet of the corrosion pool 5 is connected to the corrosive liquid container 9 through the liquid supply pipe 8, and the overflow port of the corrosion pool 5 is connected to the corrosive liquid container 9 through the overflow pipe 11. The peristaltic pump 1 is installed on the liquid supply pipe 8. When the peristaltic pump 1 rotates forward, the corrosive liquid in the corrosive liquid container 9 is injected into the corrosion pool 5 through the liquid supply pipe 8. When the peristaltic pump 1 rotates reversely, the corrosive liquid is sucked back into the corrosive liquid container 9.

[0020] The pH meter 2 is used to test the pH value of the corrosive liquid in the corrosive liquid container 9. The pH meter 2 consists of a controller head and a corrosion-resistant electrode. It can measure the corrosive liquid in real time. The corrosion-resistant electrode is immersed in the corrosive liquid in the corrosive liquid container 9, and the pH value of the corrosive liquid can be displayed in real time on the controller head.

[0021] The thermostat 3, the heating rod 4 and the temperature sensor 10 constitute a heating assembly for heating the corrosive liquid. The heating rod 4 and the temperature sensor 10 are both made of corrosion-resistant materials. The temperature sensor 10 is a thermocouple and is installed in the overflow pipe 11 (it can also be installed in the corrosive liquid container 9). The input end of the thermostat 3 is connected to the temperature sensor 10, and the output end is connected to the heating rod 4. The heating rod 4 is placed in the corrosive liquid container 9 to control the temperature of the corrosive liquid.

[0022] The liquid supply pipe 8 and the overflow pipe 11 are both corrosion-resistant hoses. The peristaltic pump 1 is installed on the liquid supply pipe 8. Its working principle is to pump liquid by squeezing the liquid supply pipe 8. The peristaltic pump 1 can rotate forward and reverse, filling liquid in forward and pumping liquid out reversely.

[0023] The corrosion tank 5 is a circular tank with an inner diameter greater than the diameter of the metal sample 12. The corrosion tank 5 is located in the overflow receiving tank 6. A sealing ring 7 is provided at the lower portion of the bottom plate of the overflow receiving tank 6. The metal sample 12 passes through the corrosion tank 5. The lower end of the metal sample 12 passes through the center hole of the bottom plate of the overflow receiving tank 6 and the sealing ring 7 in sequence. The function of the sealing ring 7 is to prevent the liquid in the overflow receiving tank 6 from flowing out of the center hole of the bottom plate of the overflow receiving tank 6. The liquid inlet of the corrosion tank 5 is at the lower portion of the side wall of the corrosion tank 5, and the overflow port of the corrosion tank 5 is set at the upper portion of the side wall of the corrosion tank 5.

[0024] During use, the corrosive liquid is stored in the corrosive liquid container 9, and the peristaltic pump 1 pumps the corrosive liquid out and sends it to the corrosion tank 5. The middle test area of ​​the metal sample 12 is immersed in the corrosive liquid in the corrosion tank 5, and at the same time, it is vibrated to perform fatigue testing. The corrosive liquid in the corrosion tank 5 is constantly circulating, and the peristaltic pump will keep working. When the corrosive liquid in the corrosion tank 5 reaches a certain height, it will flow out from the overflow port of the corrosion tank 5, and then flow back to the corrosive liquid container 9 through the overflow pipe 11. This continuous circulation can ensure that the pH value and temperature in the corrosion tank 5 are as consistent as possible with those in the corrosive liquid container 9. The metal sample 12 is fixed to the bottom of the corrosion tank 5 with silicone rubber to ensure sealing, and the corrosion tank 5 and the metal sample 12 maintain consistent movement and will not move relative to each other.

[0025] This system can easily and quickly set and monitor the temperature and flow rate of the corrosive liquid, and retain the parameter data during the test.

[0026] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A metal material fatigue performance testing system in a corrosive environment, characterized by: The invention comprises a fatigue testing machine, a peristaltic pump (1), a corrosion tank (5) and a corrosion liquid container (9); a metal sample (12) vertically passes through the corrosion liquid in the corrosion tank (5) and the central hole on the bottom plate of the corrosion tank (5), and the middle test area of ​​the metal sample (12) is immersed in the corrosion liquid in the corrosion tank (5); both ends of the metal sample (12) are connected to the fatigue testing machine; the corrosion liquid container (9) contains the corrosion liquid; the liquid inlet of the corrosion tank (5) is connected to the corrosion liquid container (9) through a liquid supply pipe (8); the overflow port of the corrosion tank (5) is connected to the corrosion liquid container (9) through an overflow pipe (11); and the peristaltic pump (1) is installed on the liquid supply pipe (8).

2. The metal material fatigue performance testing system in a corrosive environment according to claim 1, characterized in that: The invention also includes an overflow receiving pool (6) and a sealing ring (7), wherein the corrosion pool (5) is located in the overflow receiving pool (6), the sealing ring (7) is attached to the lower part of the bottom plate of the overflow receiving pool (6), and the lower end of the metal sample (12) passes through the central hole of the bottom plate of the overflow receiving pool (6) and the sealing ring (7) in sequence.

3. The metal material fatigue performance testing system in a corrosive environment according to claim 1 or 2, characterized in that: It also includes a pH meter (2), which includes a controller head and a corrosion-resistant electrode. The corrosion-resistant electrode is immersed in the corrosive liquid in the corrosive liquid container (9), and the signal output end of the corrosion-resistant electrode is connected to the controller head.

4. The metal material fatigue performance testing system in a corrosive environment according to claim 3, characterized in that: The device further comprises a temperature controller (3), a heating rod (4) and a temperature sensor (10), wherein the heating rod (4) is located in the corrosive liquid container (9), the temperature sensor (10) is installed in the overflow pipe (11) or the corrosive liquid container (9), the input end of the temperature controller (3) is connected to the temperature sensor (10), and the output end is connected to the heating rod (4).

5. The metal material fatigue performance testing system in a corrosive environment according to claim 4, characterized in that: The corrosion pool (5) is a circular pool, the liquid inlet of the corrosion pool (5) is arranged at the lower part of the side wall of the corrosion pool (5), and the overflow port of the corrosion pool (5) is arranged at the upper part of the side wall of the corrosion pool (5).

6. The metal material fatigue performance testing system in a corrosive environment according to claim 5, characterized in that: The temperature sensor (10) is a thermocouple.

7. The metal material fatigue performance testing system in a corrosive environment according to claim 6, characterized in that: The liquid supply pipe (8) and the overflow pipe (11) are both corrosion-resistant hoses.

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