Corrosion simulation system under synergistic effect of scouring and steam

Abstract

The utility model provides a corrosion simulation system under the synergistic effect of scouring and steam, which comprises a first tank body, and a first cavity for accommodating a liquid heating medium is formed in the side wall and the bottom of the first tank body; the second tank body is wrapped by the first cavity, and the side wall and the bottom of the second tank body are wrapped by the heating device; the sample clamping device comprises a partition plate and at least one sample clamp, the partition plate is in contact connection with the inner wall of the second groove body, and the position is adjustable; a plurality of through holes are distributed along the edge of the partition plate and are used for clamping a tubular and / or rod-shaped sample to be detected; one end of the clamp is connected with the partition plate, and the other end of the clamp is provided with a groove for embedding a to-be-detected block-shaped sample, and the groove faces the partition plate, so that an inclination angle is formed between the to-be-detected block-shaped sample and the surface of the partition plate; the sealing device is connected with an opening in the top of the second tank body. According to the system disclosed by the utility model, a corrosion simulation experiment with multiple samples, multiple angles and multiple test modes can be carried out under the same device, and a material corrosion wear failure mechanism can be quickly, effectively and correctly explored.

Description

Technical Field

[0001] The utility model relates to the technical field of metal corrosion failure detection and prediction, and particularly relates to a corrosion simulation system under the synergistic action of erosion and steam. Background Art

[0002] With the rapid development of China's industry, metal materials are more widely used in the fields of ocean and chemical industry. The working environments of various distillation columns and heat exchangers are becoming more and more harsh, and various metal material (such as steel) pipelines are also bearing more and more complex working conditions. The harsh working environment causes serious corrosion of metal materials during service, which is likely to trigger production and safety accidents, resulting in huge economic losses. Therefore, it is necessary to simulate and predict the real situation in the environment where the materials are located, and explore the corrosion and wear failure mechanism, so as to prevent their damage.

[0003] In the prior art, the devices for simulating the real corrosion environment generally simulate erosion corrosion by using a high-pressure pump to impact the surface of a sample with a two-phase flow solution containing solid particles, or perform steam corrosion by placing the sample in high-temperature steam. These two devices for simulating corrosion are too complex, and the simulation cost is high. Moreover, in the existing methods, these two modes are carried out separately and cannot meet the requirement of arbitrary switching.

[0004] However, in the actual production process, the service environment of metal materials may not be single. With the change of the amount of the solution, there may be an alternation of erosion corrosion or steam corrosion. At present, the simulation system cannot explore the mutual relationship between erosion and steam corrosion, so it cannot accurately explore the corrosion and wear failure mechanism of materials under multi-factor corrosion conditions, thus cannot accurately predict the service life of materials, resulting in the inability to ensure their use safety and timeliness. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an efficient and simple corrosion simulation system aiming at the deficiencies of the prior art, which can realize the erosion corrosion environment with multiple samples, different erosion speeds, different temperatures, different erosion angles and different solutions, and can arbitrarily switch between erosion corrosion and steam corrosion during the test, and combine multiple test technologies to clarify the corrosion mechanism of metals in a specific environment.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A corrosion simulation system under the synergistic action of erosion and steam, comprising:

[0008] A first tank body, with an opening at the top, and a first cavity for accommodating a liquid heating medium on the side wall and the bottom. An inlet is provided on one side of the first cavity, and an outlet is provided on the other side opposite to the inlet, and the inlet is located above the outlet;

[0009] A second tank body enclosed by the first cavity, wherein the sidewall and bottom of the second tank body are enclosed by a heating device;

[0010] The liquid heating medium flows into the first cavity from the inlet until it fills the first cavity, and flows out from the outlet, so that the liquid heating medium in the first cavity forms a circulation, and the second tank body is kept at a constant temperature through the heating device;

[0011] The sample clamping device comprises a partition and at least one clamp, wherein the partition is seamlessly connected to the inner wall of the second trough body and the position is adjustable; the partition is provided with a plurality of through holes along the edge thereof for clamping the tubular and / or rod-shaped samples to be tested;

[0012] One end of the fixture is connected to the partition, and the other end of the fixture is provided with a groove for engaging the block sample to be tested, the groove faces the partition, so that an inclination angle θ is formed between the block sample to be tested and the surface of the partition;

[0013] The sealing device includes a sealing cover connected to the opening at the top of the second tank body, and the stirring device, the pH testing device and the temperature testing device penetrate the sealing cover and extend into the second tank body and penetrate the partition plate for stirring and testing the corrosion solution;

[0014] The position relationship between the sample to be tested and the corrosion solution is adjusted by adjusting the position of the partition, so as to switch between the erosion corrosion test and the steam corrosion test.

[0015] Preferably, the clamp includes a first clamping part and a second clamping part which are connected to each other, the first clamping part is provided with a groove for engaging the block sample to be tested, the second clamping part is connected to the partition, the groove on the first clamping part faces the partition, and forms an inclination angle θ between the block sample to be tested and the surface of the partition.

[0016] Preferably, the inclination angle θ ranges from 0° to 90°.

[0017] Preferably, the first clamping part and the second clamping part are connected with each other in a loose-leaf manner, and the required inclination angle is adjusted by adjusting the angle between the first clamping part and the second clamping part.

[0018] Preferably, the second clamping portion is connected to the partition via an L-shaped fixing device.

[0019] Preferably, at least one lifting rod is provided on the partition, one end of the lifting rod is connected to the partition, and the other end of the lifting rod passes through the sealing cover and extends out of the second tank body for adjusting the position of the partition.

[0020] Preferably, the sealing cover is provided with a plurality of through holes, and the stirring device, the pH testing device, the temperature testing device and the lifting rod pass through the corresponding through holes to reach the desired positions.

[0021] Preferably, the stirring device, the pH testing device, the temperature testing device and the lifting rod are hermetically connected to the respective through holes on the sealing cover.

[0022] Preferably, the partition plate is arranged in a circular ring shape, and the stirring device, the pH testing device and the temperature testing device pass through the hollow part of the ring and extend towards the bottom of the second tank body.

[0023] Preferably, the number of the jigs is set according to experimental requirements. When multiple jigs are required, the distance between adjacent jigs remains the same.

[0024] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0025] The corrosion simulation system under the synergistic action of scouring and steam proposed by the present utility model can simulate various harsh corrosion environments, can freely switch between scouring corrosion and steam corrosion during the test, and simultaneously test the scouring corrosion experiments of samples at different scouring angles, so as to realize the corrosion simulation experiments of multiple specimens, multiple angles and multiple test modes on the same device. While quickly, effectively and correctly exploring the failure mechanism of material corrosion and wear, it reduces the errors caused by the small differences in samples and test conditions and avoids the contingency of experimental results, thereby improving the credibility of the test.

[0026] The corrosion simulation system under the synergistic action of scouring and steam of the present utility model has a simple structure, is easy to manufacture, has a low cost, is simple and portable to use, can realize experiments of multiple specimens, multiple angles and multiple modes, greatly improves the experimental efficiency and accuracy, and on the premise of obtaining the correct failure mechanism of corrosion and wear, accurately predicts the service life of the material to ensure its use safety and timeliness. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of the corrosion simulation system under the synergistic action of scouring and steam of the present utility model.

[0028] Figure 2 is a schematic structural diagram of the corrosion simulation system under the synergistic action of scouring and steam of the present utility model.

[0029] Figure 3 is a schematic structural diagram of the partition plate of the present utility model.

[0030] Figure 4 is a schematic structural diagram of the jig and the connecting piece of the present utility model.

[0031] Figure 5 is a schematic diagram of the inclination angle formed by the block sample to be tested and the partition plate of the present utility model.

[0032] Figure 6 is a schematic structural diagram of the sample clamping device of the present invention.

[0033] Figure 7 It is a schematic diagram showing that multiple blocky samples of the present utility model are distributed to form different inclination angles with the partition board.

[0034] Explanation of reference numerals in the drawings: 10, first tank body; 11, first cavity; 11-1, inlet; 11-2, outlet; 12, heating device; 13, second tank body; 20, sample clamping device; 21, partition board; 21-1, through hole; 21-2, lifting rod; 22, clamp; 22-1, first clamping part; 22-1A, groove; 22-2, second clamping part; 23, L-shaped fixing device; 30, tubular and / or rod-shaped sample; 40, blocky sample; 50, sealing cover; 60, stirring device; 70, pH testing device; 80, temperature testing device. Detailed implementation manners

[0035] In order to better understand the technical content of the present utility model, specific embodiments are hereby given and described in conjunction with the accompanying drawings as follows.

[0036] In the present disclosure, aspects of the present utility model are described with reference to the accompanying drawings, in which many illustrative embodiments are shown. The embodiments of the present disclosure are not necessarily intended to cover all aspects of the present utility model. It should be understood that the various concepts and embodiments introduced above, as well as those described in more detail below, can be implemented in any of many ways.

[0037] Corrosion simulation system under the synergistic action of scouring and steam

[0038] Combined with Figure 1-5 As shown, an exemplary corrosion simulation system under the synergistic action of scouring and steam of the present utility model includes a first tank body 10 and a sample clamping device 20.

[0039] As Figure 1 As shown, the top of the first tank body 10 is provided with an opening, and the side wall and the bottom are provided with a first cavity 11 for accommodating a liquid heating medium. One side of the first cavity is provided with an inlet 11-1, and the other side opposite to the inlet is provided with an outlet 11-2, and the inlet 11-1 is located above the outlet 11-2.

[0040] The interior of the first tank body wrapped by the first cavity 11 forms a second cavity, and a heating device 12 is laid along the inner wall of the cavity in the second cavity.

[0041] The second tank body 13 is arranged in the second cavity, and the side wall and the bottom of the second tank body 13 are wrapped by the heating device 12.

[0042] As an optional example, the heating device 12 is a heating wire, which is laid on the inner wall of the second cavity in a serpentine reciprocating manner.

[0043] In another alternative example, the heating device is wrapped by a protective cover to prevent damage to the heating wire.

[0044] The liquid heating medium flows in from the inlet 11-1 until the first cavity 11 is filled, and flows out from the outlet 11-2, so that the liquid heating medium in the first cavity 11 forms a cycle, and the second tank body 13 is kept at a constant temperature by the heating device 12.

[0045] In an alternative example, the liquid heating medium is water. It can be understood that the liquid heating medium includes but is not limited to water, and can also be other heat-conducting media, such as oil.

[0046] Combined Figure 1 、 Figure 2 As shown in the figure, the sample clamping device 20 is arranged in the second tank body 13, and includes a partition plate 21 and at least one clamp 22. The partition plate 21 is in seamless contact connection with the inner wall of the second tank body 13, and its position is adjustable.

[0047] It can be understood that the partition plate 21 is engaged with the inner wall of the second tank body 13 through friction to form a movable connection.

[0048] Combined Figure 3 As shown in the figure, a number of through holes 21-1 are distributed along the edge of the partition plate 21 for clamping the tubular and / or rod-shaped samples 30 to be tested; it can be understood that the tubular and / or rod-shaped samples 30 are clamped in the through holes of the partition plate through friction, and the inclination angle between the sample and the partition plate cannot be adjusted. The use of the whole pipe or rod is to study the overall and macroscopic failure behaviors and modes.

[0049] In one alternative example, the diameter of the through hole 21-1 is set to be equal to the diameter of the tubular and / or rod-shaped sample 30. The partition plate can be made of resin material. The tubular and / or rod-shaped sample 30 is inserted into the through hole 21-1 by extrusion and clamped by friction.

[0050] Combined Figure 4 、 Figure 5 、 Figure 6 As shown in the figure, the clamp 22 includes a first clamping part 22-1 and a second clamping part 22-2 which are connected to each other. A groove 22-1A for fitting the block-shaped sample 40 to be tested is provided on the first clamping part 22-1. The second clamping part 22-2 is connected to the partition plate 21. The groove 22-1A on the first clamping part faces the partition plate 21, and an inclination angle θ is formed between the block-shaped sample to be tested and the surface of the partition plate.

[0051] As Figure 4 shown, as an alternative example, the second clamping part 22-2 is connected to the partition plate 21 through an L-shaped fixing device 23.

[0052] In a specific example, one end of the L-shaped fixing device 23 is fixed to the second clamping portion 22-2 by a bolt, and the other end of the L-shaped fixing device 23 is fixed to the partition plate 21 by a bolt.

[0053] As an alternative example, the range of the inclination angle θ is 0° to 90°.

[0054] As an alternative example, the number of the jigs 22 is set according to the experimental requirements. When multiple jigs are needed, the distance between adjacent jigs remains the same.

[0055] In another alternative example, as Figure 6 、 Figure 7 shown, when testing multiple samples simultaneously, the sample jigs 22 can be evenly distributed along the edge of the partition plate 21. The inclination angle θ between the block-shaped sample 40 to be tested on each jig and the surface of the partition plate can be the same or different, and can be adjusted according to the experimental requirements, but the range of the inclination angle θ is 0° to 90°.

[0056] As an alternative example, the first clamping portion 22-1 and the second clamping portion 22-2 are connected by a hinge, and the required inclination angle is adjusted by adjusting the angle between the first clamping portion and the second clamping portion.

[0057] The purpose of scouring the block-shaped sample to be tested at different inclination angles is to explore the corrosion failure behaviors, forms, and mechanisms of some special parts. Since the scouring angle will be formed at the location, and different parts will form different scouring angles. For example, at the pipe bend, the corrosion form and mechanism of the sample may be different under scouring at different inclination angles.

[0058] It can be understood that the corrosion simulation of tubular and / or rod-shaped samples, as well as block-shaped samples, can be carried out simultaneously, or separately. When only carrying out the corrosion simulation of tubular and / or rod-shaped samples, the jig 22 can be directly disassembled for the experiment.

[0059] As Figure 1 、 2 shown, the corrosion simulation system is also provided with a sealing device. The sealing device includes a sealing cover 40, which is hermetically connected to the opening at the top of the second tank body 14.

[0060] As an alternative example, the sealing cover 50 is threadedly connected to the second tank body 13 and is provided with a sealing ring. The sealing cover 40 is also provided with through holes for passing through the stirring device 60, the pH testing device 70, and the temperature testing device 80, and, as Figure 3 described, the partition plate 21 is arranged in a circular ring shape to facilitate the passing of the stirring device 60, the pH testing device 70, and the temperature testing device 80.

[0061] The stirring device 60, the pH testing device 70, and the temperature testing device 80 penetrate through the sealing cover and extend into the second tank body 14, and penetrate through the partition plate 21 until approaching the bottom of the second tank body. In this way, one end of the stirring device 60, the pH testing device 70, and the temperature testing device 80 can be immersed in the corrosive solution to stir and test the corrosive solution.

[0062] As Figure 1 shown, as an optional example, at least one lifting rod 21-2 is provided on the partition plate. One end of the lifting rod is connected to the partition plate, and the other end of the lifting rod passes through the through hole on the sealing cover and extends outside the second tank body. The tester can directly lift or press the lifting rod 21-2 to adjust the position of the partition plate, and adjust the positional relationship between the sample and the corrosive solution by adjusting the position of the partition plate to switch between the erosion corrosion experiment and the steam corrosion experiment.

[0063] As an optional example, the stirring device 60, the pH testing device 70, the temperature testing device 80, and the lifting rod 21-2 are hermetically connected to the respective corresponding through holes on the sealing cover 50 to prevent the escape of corrosive steam.

[0064] As an optional example, the stirring device 60 is located at the central axis of the second tank body, and the pH testing device 70 and the temperature testing device 80 are respectively located on both sides of the stirring device and are kept at a distance from the stirring device to prevent the pH testing device 70 and the temperature testing device 80 from touching the stirring device and causing damage.

[0065] As an optional example, parts and devices such as the second tank body 13, the sample clamping device 20, and the stirring device 60 placed in the corrosive environment can all be made of corrosion-resistant materials, such as polytetrafluoroethylene.

[0066] As an optional example, the aforementioned corrosion simulation system can all be manufactured by 3D printing.

[0067] Corrosion simulation method under the synergistic action of scouring and steam

[0068] In another exemplary embodiment of the present invention, based on the corrosion simulation system under the synergistic action of the aforementioned erosion and steam, a corrosion simulation method under the synergistic action of erosion and steam is provided, including the following steps:

[0069] When the sample to be tested is tubular and / or rod-shaped, insert the cleaned sample to be tested into the through holes distributed along the edge of the partition plate; when the sample to be tested is block-shaped, fit the cleaned sample to be tested into the groove of the first clamping part, and fix the second clamping part to the partition plate so that the sample to be tested faces the partition plate, and adjust the angle between the first clamping part and the second clamping part to adjust the angle between the sample to be tested and the surface of the partition plate to the required angle;

[0070] Place the partition plate with the sample to be tested into the second tank filled with the corrosion solution until the corrosion solution submerges the sample to be tested and make the surface of the partition plate parallel to the liquid level of the corrosion solution;

[0071] Then, assemble the sealing cover, and pass the stirring device, pH testing device and temperature testing device through the sealing cover and extend them into the second tank, and penetrate the partition plate so that the stirring paddle and the sample to be tested are on the same horizontal plane;

[0072] Set the stirring speed of the stirring device according to the experimental requirements, and inject the liquid heating medium into the first cavity through the inlet until the liquid heating medium in the first cavity forms a cycle, turn on the heating device and heat it to the required temperature to keep the second tank at a constant temperature;

[0073] After that, turn on the stirring device and ensure that the tangential direction of the rotation direction of the stirring device is perpendicular to the surface of the sample to be tested, so that the scouring particles in the corrosion solution vertically impact the sample to be tested for scouring corrosion; after the scouring corrosion is over, adjust the position of the partition plate so that the sample to be tested leaves the corrosion solution and is above the liquid level of the corrosion solution for steam corrosion;

[0074] According to the experimental requirements, repeat the scouring corrosion and steam corrosion in a cycle until the experiment ends, and analyze the samples that have completed the experiment.

[0075] It can be understood that if the stirring paddle and the sample to be tested are to be on the same horizontal plane, the surface of the partition plate where the sample is set should face the bottom of the second tank. That is to say, when using tubular and / or rod-shaped samples, the side of the sample that extends out of the partition plate after being inserted into the partition plate should face the bottom of the second tank; when using block-shaped samples, the second clamping part should face the bottom of the second tank.

[0076] Furthermore, when using tubular and / or rod-shaped samples, only one end of the sample may extend out of the partition plate after being inserted into the partition plate, or both ends may extend out of the partition plate, which can be selected according to the actual environment to be simulated.

[0077] In a further example, the corrosion solution contains scouring particles, and their types and contents are set according to the experimental requirements.

[0078] In this way, by means of adjusting the sediment content of the solution, controlling the solution stirring, controlling the clamping angle of the sample, controlling the up and down reciprocating movement of the sample fixing plate, controlling the solution temperature, and controlling the alternating functional movement of steam corrosion and scouring corrosion, etc., the surface scouring corrosion rate of metal materials in sand-containing solutions, the corrosion behavior of metal materials in the high-temperature steam action area, and the corrosion behavior of samples under the synergistic action of steam and scouring can be changed by mechanical movement control.

[0079] Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Those of ordinary skill in the technical field to which the present utility model pertains can make various modifications and refinements without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to that defined by the claims.

Claims

1. A corrosion simulation system under the synergistic action of erosion and steam, characterized in that Comprising: A first tank body (10) with an opening at the top, and a first cavity (11) for containing a liquid heating medium is provided on the side wall and the bottom. An inlet (11-1) is provided on one side of the first cavity (11), and an outlet (11-2) is provided on the other side opposite to the inlet, and the inlet is located above the outlet. A second tank body (13) wrapped by the first cavity (11), and the side wall and the bottom of the second tank body (13) are wrapped by a heating device (12). The liquid heating medium flows in from the inlet until the first cavity (11) is full, and then flows out from the outlet, so that the liquid heating medium in the first cavity (11) forms a cycle, and the second tank body (13) is kept at a constant temperature by the heating device (12). A sample clamping device (20), including a partition plate (21) and at least one clamp (22), the partition plate (21) is in seamless contact connection with the inner wall of the second tank body (13) and its position is adjustable; a number of through holes (21-1) are distributed along the edge of the partition plate (21) for clamping a to-be-tested tubular and / or rod-shaped sample (30). One end of the clamp (22) is connected to the partition plate (21), and a groove (22-1A) for fitting a to-be-tested block-shaped sample (40) is provided at the other end of the clamp (22), and the groove (22-1A) faces the partition plate (21), so that an inclination angle θ is formed between the to-be-tested block-shaped sample (40) and the surface of the partition plate (21). A sealing device, including a sealing cover (50) connected to the opening at the top of the second tank body (13), and a stirring device (60), a pH testing device (70) and a temperature testing device (80) penetrate through the sealing cover (50) and extend into the second tank body (13) and penetrate through the partition plate (21) for stirring and testing the corrosive solution. Wherein, by adjusting the position of the partition plate (21), the positional relationship between the to-be-tested sample and the corrosive solution is adjusted to switch between the erosion corrosion experiment and the steam corrosion experiment.

2. The corrosion simulation system under the synergistic action of erosion and steam according to claim 1, wherein The clamp (22) includes a first clamping part (22-1) and a second clamping part (22-2) connected to each other. A groove (22-1A) for fitting a to-be-tested block-shaped sample (40) is provided on the first clamping part (22-1), the second clamping part (22-2) is connected to the partition plate (21), and the groove (22-1A) on the first clamping part faces the partition plate (21), and an inclination angle θ is formed between the to-be-tested block-shaped sample (40) and the surface of the partition plate (21).

3. The corrosion simulation system under the synergistic action of erosion and steam according to claim 1 or 2, characterized in that The range of the inclination angle θ is 0° to 90°.

4. The corrosion simulation system under the synergistic action of erosion and steam according to claim 2, wherein The first clamping part (22-1) and the second clamping part (22-2) are connected by a hinge, and the required inclination angle is adjusted by adjusting the angle between the first clamping part (22-1) and the second clamping part (22-2).

5. The corrosion simulation system under the synergistic action of erosion and steam according to claim 2, wherein The second clamping part (22-2) is connected to the partition plate (21) through an L-shaped fixing device (23).

6. The corrosion simulation system under the synergistic action of erosion and steam according to claim 1, characterized in that At least one lifting rod (21-2) is provided on the partition plate (21), one end of the lifting rod (21-2) is connected to the partition plate, and the other end of the lifting rod (21-2) passes through the sealing cover (50) and extends outside the second tank body (13) for adjusting the position of the partition plate (21).

7. The corrosion simulation system under the synergistic action of erosion and steam according to claim 6, wherein The sealing cover (50) is provided with a plurality of through holes, and the stirring device (60), the pH testing device (70), the temperature testing device (80) and the lifting rod (21-2) pass through the corresponding through holes to reach the required positions.

8. The corrosion simulation system under the synergistic action of erosion and steam according to claim 7, wherein The stirring device (60), the pH testing device (70), the temperature testing device (80) and the lifting rod (21-2) are hermetically connected to the respective corresponding through holes on the sealing cover.

9. The corrosion simulation system under the synergistic action of erosion and steam according to claim 1, wherein The partition plate (21) is arranged in a circular ring shape, and the stirring device (60), the pH testing device (70), and the temperature testing device (80) pass through the hollow part of the circular ring and extend towards the bottom of the second tank body (13).

10. The corrosion simulation system under the synergistic action of erosion and steam according to claim 1, wherein The number of the jigs (22) is set according to the experimental requirements. When multiple jigs (22) are required, the distance between adjacent jigs (22) remains the same.

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