Corrosion test device for applying tension and compression load

Abstract

The utility model provides a corrosion test device for applying tension and compression load, which comprises a bottom plate, a loading mechanism arranged at the right end of the upper side of the bottom plate, an isolation frame arranged at the left end of the upper side of the bottom plate, a corrosion environment box arranged in the isolation frame, a left connecting rod and a right connecting rod oppositely arranged in the corrosion environment box, and clamps arranged on the left connecting rod and the right connecting rod, the left connecting rod penetrates through the corrosion environment box in a sealed mode and is connected with the tension-compression stress sensor, the tension-compression stress sensor is arranged on the inner wall of the isolation frame, and the right connecting rod penetrates through the corrosion environment box and the isolation frame in a sealed and sliding mode and is connected with the loading mechanism. The device is convenient for applying tension and compression load to the test piece in a corrosion solution and researching the influence of external load on the corrosion condition of the test piece.

Description

Technical Field

[0001] This utility model relates to the technical field of corrosion testing devices, and in particular to a corrosion testing device that applies tensile and compressive loads. Background Technology

[0002] High-strength aluminum alloys are widely used in the aerospace industry due to their excellent mechanical properties, light weight, and good machinability. However, in atmospheric environments, especially marine environments, high-strength aluminum alloys are prone to severe corrosion, such as pitting corrosion, exfoliation corrosion, and intergranular corrosion. Aircraft structures often bear significant loads during service, and the combined effect of corrosive media and stress leads to stress corrosion cracking in aluminum alloys. Traditionally, tensile stress is considered to promote stress corrosion, while compressive stress helps to mitigate it. However, investigations of aging aircraft have found that pressure-bearing structures, such as the lower edge of the keel beam, are more susceptible to exfoliation corrosion than structures subjected to tensile loads. Current research on the influence of compressive stress on the exfoliation performance of aluminum alloys is limited and inconsistent. Therefore, designing a corrosion device that can continuously apply constant tensile and compressive stress is of great significance, both for studying the phenomena and elucidating the underlying mechanisms.

[0003] Current research on the influence of stress factors on the corrosion behavior of aluminum alloys, both domestically and internationally, is mostly based on U-shaped bending specimens. A few experiments involving applying loads to metals in corrosive solution environments use bolts or springs for loading, which results in low load accuracy and difficulty in maintaining a constant load during long-term experiments. Utility Model Content

[0004] This invention proposes a corrosion testing device for applying tensile and compressive loads, which facilitates the application of tensile and compressive loads to specimens in corrosive solutions to study the influence of external loads on the corrosion of specimens.

[0005] The technical solution of this utility model is implemented as follows: A corrosion test device for applying tensile and compressive loads includes a base plate, a loading mechanism is provided at the right end of the upper side of the base plate, and an isolation frame is provided at the left end. A corrosion environment chamber is provided inside the isolation frame. A left connecting rod and a right connecting rod are arranged opposite each other inside the corrosion environment chamber. A clamp is provided on both the left and right connecting rods. The left connecting rod passes through the corrosion environment chamber in a sealed manner and is connected to a tensile and compressive stress sensor. The tensile and compressive stress sensor is set on the inner wall of the isolation frame. The right connecting rod slides through the corrosion environment chamber and the isolation frame in a sealed manner and is connected to the loading mechanism.

[0006] Furthermore, it also includes a stirring mechanism, which includes a stirrer disposed within the corrosive environment chamber.

[0007] Furthermore, the isolation frame is welded and fixed to the base plate, and the bottom of the corrosive environment chamber is fixed to the base plate with bolts, with U-shaped rings for sealing at the bolts.

[0008] Furthermore, the left end of the isolation frame is a detachable side plate, the tension and compression stress sensor is set inside the side plate, the corrosive environment chamber is horizontally slidably set on the bottom plate, and the right connecting rod is detachably connected to the loading mechanism.

[0009] Furthermore, the loading mechanism is an electric actuator.

[0010] Furthermore, the electric push rod, right connecting rod, clamp, left connecting rod, and tension / compression stress sensor are arranged coaxially.

[0011] Furthermore, the left end of the corrosion environment chamber is provided with a through hole corresponding to the left connecting rod, and the right end of the corrosion environment chamber is provided with a sliding hole corresponding to the right connecting rod. U-shaped rings are provided in both the through hole and the sliding hole.

[0012] The beneficial effects of this utility model are:

[0013] This novel corrosion testing apparatus facilitates the placement of specimens in a corrosion environment chamber, achieving coupling between the corrosion environment and the load. Tensile and compressive stress sensors monitor the load on the specimens in real time. The loading mechanism and stress sensors work together to maintain a constant load value set in the experiment. By rating the degree of corrosion of the specimens after the experiment and testing the mechanical properties of the specimens after pre-damage, the corrosion behavior and mechanism of aluminum alloys under the coupled effects of environment and load are studied, and the degradation law of the mechanical properties of aluminum alloys after pre-damage is further analyzed. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a front view of Embodiment 1 of the present utility model;

[0016] Figure 2 This is a top view of Embodiment 1 of the present invention;

[0017] Figure 3 This is a front view of Embodiment 2 of the present invention;

[0018] Figure 4 This is the front view of Embodiment 3 of this utility model.

[0019] 1. Base plate; 2. Loading mechanism; 3. Housing; 4. Isolation frame; 5. Corrosion environment chamber; 6. Left connecting rod; 7. Right connecting rod; 8. Fixture; 9. Through hole; 10. Sliding hole; 11. Tensile / compressive stress sensor; 12. Stud; 13. Specimen; 14. Stirrer; 15. Stirring rod; 16. Side plate; 17. Guide rail; 18. Slide groove; 19. Limiting block; 20. Limiting pin. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1

[0022] like Figure 1 and 2 As shown, a corrosion testing device for applying tensile and compressive loads includes a base plate 1. A loading mechanism 2 is fixed to the right end of the upper side of the base plate 1. A housing 3 is fitted around the outside of the loading mechanism 2. An isolation frame 4 is welded and fixed to the left end of the upper side of the base plate 1. The side plates of the isolation frame 4 are all welded and fixed to the base plate 1 and cannot be disassembled. A corrosion environment chamber 5 is set inside the isolation frame 4. The bottom of the corrosion environment chamber 5 is fixed to the base plate 1 by bolts. U-rings are installed at the bolts for sealing, thus fixing the corrosion environment chamber 5 to the base plate 1. The isolation frame 4 isolates the corrosion environment chamber 5, further preventing leakage of the corrosive solution.

[0023] Inside the corrosion environment chamber 5, a left connecting rod 6 and a right connecting rod 7 are arranged facing each other. A clamp 8 is fixed to both the left and right connecting rods 6 and 7, and the clamp 8 is used to hold the end of the specimen 13. A through hole 9 corresponding to the left connecting rod 6 is provided at the left end of the corrosion environment chamber 5, and a sliding hole 10 corresponding to the right connecting rod 7 is provided at the right end of the corrosion environment chamber 5. A U-shaped ring for sealing is installed in both the through hole 9 and the sliding hole 10. The left connecting rod 6 passes through the through hole 9 of the corrosion environment chamber 5 and is connected to a tensile / compressive stress sensor 11, which is fixed to the inner wall of the isolation frame 4.

[0024] The right connecting rod 7 slides through the corrosive environment chamber 5, then slides through the isolation frame 4, and is connected to the loading mechanism 2. The loading mechanism is an electric push rod, the working end of which is fixedly connected to the right connecting rod 7. The electric push rod, right connecting rod 7, clamp 8, specimen 13, left connecting rod 6, and tensile / compressive stress sensor 11 are arranged coaxially. The electric push rod and tensile / compressive stress sensor 11 are both connected to a PLC controller, which controls the left and right movement of the electric push rod to apply a load to the specimen 13.

[0025] The base plate 1, isolation frame 4, corrosion environment chamber 5, left connecting rod 6, right connecting rod 7, clamp 8, and shell 3 are all made of corrosion-resistant 316 stainless steel.

[0026] The method of using the corrosion testing device is as follows: Add the prepared EXCO solution (corrosion solution) to the corrosion environment chamber 5, place the specimen 13 between the two clamps 8, with the end of the specimen 13 connected to the corresponding clamp 8, and then start the loading mechanism 2. If the right connecting rod 7 is pushed to the left, pressure is applied to the specimen 13; if the right connecting rod 7 is pulled to the right, tension is applied to the specimen 13. The load on the specimen 13 is zeroed through the PLC controller. Then, the experimental time, experimental load, loading rate, and direction of movement of the electric push rod are set before starting the experiment. During the experiment, the load on the specimen is transmitted to the PLC controller in real time through the tensile and compressive stress sensor 11. The PLC controller monitors the load on the specimen in real time and performs timely movement compensation after load fluctuations.

[0027] Example 2

[0028] This embodiment is basically the same as Embodiment 1, except that, as Figure 3 As shown, a corrosion testing apparatus for applying tensile and compressive loads further includes a stirring mechanism, which comprises a stirrer 14 disposed within a corrosion environment chamber 5. The stirrer 14 may be a corrosion-resistant stirring blade connected to a vertical stirring rod 15, and the stirring blade is driven to rotate by a motor. The stirrer 14 circulates the corrosive solution.

[0029] Example 3

[0030] This embodiment is basically the same as embodiment 1 or 2, except that, as Figure 4 As shown, the left end of the isolation frame 4 is a detachable side plate 16. The side plate 16 is detachably connected to the left end of the isolation frame 4 by bolts. Sealing strips are fixed on the front and rear sides and bottom of the side plate 16 to ensure the sealing of the connection between the side plate 16 and the isolation frame 4.

[0031] Tensile and compressive stress sensors 11 are fixed to the inner side of side plate 16. A guide rail 17 is fixed on the bottom plate 1 inside the isolation frame 4. A sliding groove 18 that slides along the guide rail 17 is fixed to the lower end of the corrosion environment chamber 5, allowing the corrosion environment chamber 5 to slide horizontally on the bottom plate 1. A limit block 19 is fixed to the right end of the guide rail 17 to limit the right end position of the corrosion environment chamber 5. Limit pins 20 are inserted into the front and rear side walls of the isolation frame 4 to limit the left end position of the corrosion environment chamber 5. A stud 12 is fixed to the working end of the electric push rod. The stud 12 and the working end are an integral structure. The stud 12 is detachably connected to the right connecting rod 7 by threads.

[0032] If it is necessary to clean the fixture 8 and the corrosion environment box 5, the right connecting rod 7 can be rotated to separate the right connecting rod 7 from the electric push rod. Then, the limit pin 20 can be pulled out, the side plate 16 can be removed, and the corrosion environment box 5 can be moved to the left along the guide rail 17. Then, the corrosion environment box 5 can be removed from the base plate 1.

[0033] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A corrosion testing apparatus for applying tensile and compressive loads, comprising a base plate, characterized in that: A loading mechanism is installed on the right side of the upper side of the base plate, and an isolation frame is installed on the left side. A corrosion environment chamber is installed inside the isolation frame. A left connecting rod and a right connecting rod are arranged opposite each other inside the corrosion environment chamber. Both the left and right connecting rods are equipped with clamps. The left connecting rod passes through the corrosion environment chamber in a sealed manner and is connected to a tensile and compressive stress sensor, which is installed on the inner wall of the isolation frame. The right connecting rod slides through the corrosion environment chamber and the isolation frame in a sealed manner and is connected to the loading mechanism.

2. The corrosion testing apparatus for applying tensile and compressive loads according to claim 1, characterized in that: It also includes a stirring mechanism, which includes a stirrer installed inside the corrosive environment chamber.

3. A corrosion testing apparatus for applying tensile and compressive loads according to claim 1 or 2, characterized in that: The isolation frame is welded and fixed to the base plate. The bottom of the corrosive environment chamber is fixed to the base plate with bolts, and U-shaped rings for sealing are provided at the bolts.

4. The corrosion testing apparatus for applying tensile and compressive loads according to claim 1, characterized in that: The left end of the isolation frame is a detachable side plate, and the tensile and compressive stress sensors are set on the inside of the side plate. The corrosive environment chamber is horizontally slidably set on the bottom plate, and the right connecting rod is detachably connected to the loading mechanism.

5. A corrosion testing apparatus for applying tensile and compressive loads according to any one of claims 1, 2, or 4, characterized in that: The loading mechanism is an electric push rod.

6. The corrosion testing apparatus for applying tensile and compressive loads according to claim 5, characterized in that: The electric push rod, right connecting rod, clamp, left connecting rod, and tension / compression stress sensor are arranged on the same axis.

7. The corrosion testing apparatus for applying tensile and compressive loads according to claim 1, characterized in that: The left end of the corrosion environment chamber is provided with a through hole corresponding to the left connecting rod, and the right end of the corrosion environment chamber is provided with a sliding hole corresponding to the right connecting rod. U-shaped rings are provided in both the through hole and the sliding hole.

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