Test device for simulating metal corrosion in dynamic seawater environment

Abstract

This invention discloses a test apparatus for simulating metal corrosion in a dynamic seawater environment, belonging to the field of metal corrosion testing technology. It includes a storage tank for holding a corrosive liquid, with a PTFE sleeve installed on the side wall of the tank. A PTFE slide rail is located inside the PTFE sleeve, and a PTFE reciprocating shaft is slidably and sealed within the slide rail. One end of the reciprocating shaft is connected to a PTFE disc, which is located inside the storage tank. The other end of the reciprocating shaft is connected to a drive device, which drives the reciprocating shaft to reciprocate along the PTFE slide rail. Multiple PTFE rods are inserted through the top of the storage tank, and each rod extends into the tank. A sample is connected to the end of each rod that extends into the inner cavity of the storage tank. This invention, through the above structure, can simulate the scouring effect of ocean waves in a marine environment, study the corrosion behavior of metallic materials in dynamic seawater, and provide a practical basis for the testing and development of marine engineering materials.

Description

Technical Field

[0001] This invention belongs to the field of metal corrosion testing technology, specifically relating to a test device for simulating metal corrosion in a dynamic seawater environment. Background Technology

[0002] Metallic materials undergo various forms of corrosion in seawater. Data shows that my country suffers economic losses exceeding 200 billion yuan annually due to metal corrosion. Seawater corrosion accounts for a significant proportion of this, resulting in substantial environmental damage and material waste that inflicts enormous losses on the national economy.

[0003] The corrosion behavior and its changing patterns of marine engineering materials are highly complex. Currently, the main method for evaluating their corrosion performance is the marine strip test. The strip test method has advantages such as realistic environmental conditions, simple testing, and relatively reliable results. However, it also suffers from problems such as long testing cycles and uncontrollable environmental factors. Typical testing cycles range from six months to over ten years, severely restricting the rapid application of new materials in marine engineering.

[0004] Static immersion tests are typically used to simulate marine environments and observe corrosion resistance. While this method is simple and convenient, and influencing factors are easily controlled, it does not accurately reflect the actual state of materials subjected to wave erosion in the ocean. Therefore, it cannot truly reflect the impact of the marine environment on metal corrosion. Thus, it is essential to design a corrosion simulation device for metallic materials in a dynamic seawater environment to study the corrosion behavior of marine engineering materials and components in dynamic seawater. Summary of the Invention

[0005] The purpose of this invention is to provide a test device for simulating metal corrosion in a dynamic seawater environment, which solves the technical problem that static immersion tests in the prior art do not conform to the actual state of materials being subjected to wave erosion in the ocean.

[0006] The technical solution adopted in this invention is a test device for simulating metal corrosion in a dynamic seawater environment, including a storage tank for holding a corrosive liquid. A PTFE sleeve is provided on the side wall of the storage tank. A PTFE slide is provided inside the PTFE sleeve. A PTFE reciprocating shaft is slidably and sealed inside the PTFE slide. One end of the PTFE reciprocating shaft is connected to a PTFE disc, which is located inside the storage tank. The other end of the PTFE reciprocating shaft is connected to a drive device, which drives the PTFE reciprocating shaft to reciprocate along the PTFE slide. Multiple PTFE rods are provided through the top of the storage tank, and all of the PTFE rods extend into the storage tank. The ends of the PTFE rods that extend into the inner cavity of the storage tank are connected to a sample.

[0007] The features of this invention are: The drive unit includes a reciprocating pump piston cylinder, inside which is a reciprocating pump piston. A reciprocating pump shaft is connected through the center of the reciprocating pump piston. One end of the reciprocating pump shaft passes through the reciprocating pump piston cylinder and is connected to a PTFE reciprocating shaft. The other end of the reciprocating pump shaft passes through the reciprocating pump piston cylinder and is connected to a reciprocating pump thrust plate. The reciprocating pump thrust plate abuts against an eccentric wheel. The eccentric wheel is connected to a power source, which drives the eccentric wheel to perform eccentric rotational motion.

[0008] The liquid storage tank is filled with PTFE packing at the point where the PTFE rod passes through.

[0009] The top of the liquid storage tank is connected to a first bracket, and a PTFE rod passes through the first bracket and the liquid storage tank. The first bracket is equipped with a fixing rubber ring at the point where the PTFE rod passes through.

[0010] The top of the liquid storage tank is equipped with a DC speed-regulating motor. One end of the PTFE rod protrudes from the liquid storage tank and is connected to the DC speed-regulating motor. Sealant is provided between the DC speed-regulating motor and the liquid storage tank. The top of the liquid storage tank is also equipped with a second bracket for mounting the DC speed-regulating motor.

[0011] The bottom of the storage tank is connected to a drain pipe, which is equipped with a drain valve.

[0012] A / B adhesive is used between the liquid storage tank and the PTFE sleeve.

[0013] A PTFE shaft seal is installed inside the PTFE slide and on the PTFE reciprocating shaft. The PTFE shaft seal uses a Y-type nitrile rubber sealing ring.

[0014] The liquid storage tank is made of carbon steel, and the inner wall of the tank is coated with epoxy resin.

[0015] The liquid storage tank consists of a shell and a cover, the cover being made of flexible PTFE sheet.

[0016] Compared with the prior art, the beneficial effects of the present invention are: Compared with existing technologies, this invention, during the corrosion test of metal samples, uses a power source to drive an eccentric wheel to rotate. The eccentric wheel, through the reciprocating motion of the reciprocating pump shaft, drives the PTFE disc to reciprocate, thereby generating waves in the corrosive liquid in the storage tank, forming spray, simulating the scouring effect of ocean waves in a marine environment. This allows for the study of the corrosion behavior of metal materials in moving seawater, providing a practical and feasible basis for the testing and development of marine engineering materials. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the experimental device for simulating metal corrosion in a dynamic seawater environment according to the present invention. Figure 2 This is a schematic diagram of the PTFE shaft seal in the experimental device for simulating metal corrosion in a dynamic seawater environment according to the present invention.

[0018] In the diagram, 1. Storage tank, 2. Epoxy resin coating, 3. PTFE slide, 4. Block sample, 4-1. Cylindrical sample, 5. First PTFE rod, 5-1. Second PTFE rod, 6. PTFE packing, 7. First bracket, 7-1. Fixing rubber ring, 8. DC speed-regulating motor, 9. Second bracket, 10. Sealant, 10-1. Flexible PTFE plate, 11. PTFE sleeve, 12. PTFE shaft seal, 13. PTFE reciprocating shaft, 14. Reciprocating pump piston cylinder, 15. Reciprocating pump piston, 16. Reciprocating pump shaft, 17. Reciprocating pump thrust plate, 18. Eccentric wheel, 19. Drain pipe, 20. Drain valve, 21. PTFE disc. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] Example 1 like Figure 1 As shown, the experimental apparatus for simulating metal corrosion in a dynamic seawater environment disclosed in this embodiment includes a storage tank 1 for holding a corrosive liquid. A PTFE sleeve 11 is provided on the side wall of the storage tank 1. A PTFE slide 3 is provided inside the PTFE sleeve 11. A PTFE reciprocating shaft 13 is slidably and sealed inside the PTFE slide 3. One end of the PTFE reciprocating shaft 13 is connected to a PTFE disc 21, which is located inside the storage tank 1. The other end of the PTFE reciprocating shaft 13 is connected to a driving device, which is used to drive the PTFE reciprocating shaft 13 to reciprocate along the PTFE slide 3. A plurality of PTFE rods are provided through the top of the storage tank 1. The plurality of PTFE rods extend into the storage tank 1, and the ends of the PTFE rods that extend into the inner cavity of the storage tank 1 are connected to a sample.

[0021] In this embodiment, two PTFE sleeves 11 can be installed on the side wall of the storage tank 1, one of which is a spare. During testing, the spare PTFE sleeve 11 is sealed with a sealing cap to prevent the corrosive liquid from leaking out. In this embodiment, seawater is used as the corrosive liquid to simulate metal corrosion in a seawater environment. In this embodiment, a PTFE reciprocating shaft 13 is driven by a drive device to reciprocate along the PTFE slide 3. The PTFE reciprocating shaft 13 drives a PTFE disc 21 to reciprocate inside the storage tank 1. The reciprocating motion of the PTFE disc 21 pushes the seawater inside the storage tank 1, generating waves to simulate a dynamic seawater environment. The PTFE disc 21 is threadedly connected to the PTFE reciprocating shaft 13. In the specific test, the sample is connected to a PTFE rod and inserted into the seawater inside the storage tank 1 for simulation testing. In this embodiment, the samples include a cube sample 4 and a cylindrical sample 4-1. The PTFE rod includes a first PTFE rod 5 and a second PTFE rod 5-1. The block sample 4 is connected to the first PTFE rod 5, and the cylindrical sample 4-1 is connected to the second PTFE rod 5-1. In specific tests, it is not limited to two samples and PTFE rods, and all samples in this invention are metal samples.

[0022] Example 2 The experimental apparatus for simulating metal corrosion in a dynamic seawater environment disclosed in this embodiment includes a storage tank 1 for holding a corrosive liquid. A PTFE sleeve 11 is provided on the side wall of the storage tank 1. A PTFE slide rail 3 is provided inside the PTFE slide rail 3. A PTFE reciprocating shaft 13 is slidably and sealed inside the PTFE slide rail 3. One end of the PTFE reciprocating shaft 13 is connected to a PTFE disc 21, which is located inside the storage tank 1. The other end of the PTFE reciprocating shaft 13 is connected to a driving device, which is used to drive the PTFE reciprocating shaft 13 to reciprocate along the PTFE slide rail 3. A plurality of PTFE rods are provided through the top of the storage tank 1. The plurality of PTFE rods extend into the storage tank 1. The ends of the PTFE rods that extend into the inner cavity of the storage tank 1 are connected to a sample. The drive unit includes a reciprocating pump piston cylinder 14, inside which is a reciprocating pump piston 15. A reciprocating pump shaft 16 is connected through the center of the reciprocating pump piston 15. One end of the reciprocating pump shaft 16 passes through the reciprocating pump piston cylinder 14 and is connected to a PTFE reciprocating shaft 13. The other end of the reciprocating pump shaft 16 passes through the reciprocating pump piston cylinder 14 and is connected to a reciprocating pump thrust plate 17. The reciprocating pump thrust plate 17 abuts against an eccentric wheel 18. The eccentric wheel 18 is connected to a power source, which drives the eccentric wheel 18 to perform eccentric rotational motion.

[0023] In this embodiment, the reciprocating pump shaft 16 is threadedly connected to the PTFE reciprocating shaft 13. The stroke and speed of the reciprocating pump piston cylinder are further adjusted by controlling the rotation speed of the eccentric wheel 18. The power source can be an electric motor. The output shaft of the motor drives the eccentric wheel 18 to rotate. The stroke and speed of the reciprocating pump piston cylinder are further controlled and adjusted by controlling the speed of the motor. Specifically, the rotation of the eccentric wheel 18 applies force to the reciprocating pump thrust plate 17, and further applies a force toward the liquid storage tank 1 to the reciprocating pump shaft 16. After the force applied by the eccentric wheel 18 ends and a wave is formed, the reciprocating pump piston 15 applies a force away from the liquid storage tank 1 to the reciprocating pump shaft 16. This cycle is repeated to achieve the function of cyclically forming waves.

[0024] Example 3 The experimental apparatus for simulating metal corrosion in a dynamic seawater environment disclosed in this embodiment includes a storage tank 1 for holding a corrosive liquid. A PTFE sleeve 11 is provided on the side wall of the storage tank 1. A PTFE slide rail 3 is provided inside the PTFE sleeve 11. A PTFE reciprocating shaft 13 is slidably and sealed inside the PTFE slide rail 3. One end of the PTFE reciprocating shaft 13 is connected to a PTFE disc 21, which is located inside the storage tank 1. The other end of the PTFE reciprocating shaft 13 is connected to a driving device, which drives the PTFE reciprocating shaft 13 to reciprocate along the PTFE slide rail 3. Multiple PTFE rods are provided through the top of the storage tank 1, and all the PTFE rods extend into the storage tank 1. A sample is connected to the end of each PTFE rod that extends into the inner cavity of the storage tank 1. Figure 2 As shown, the liquid storage tank 1 is provided with PTFE packing 6 at the PTFE rod penetration point. A / B adhesive is provided between the liquid storage tank 1 and the PTFE sleeve 11. A PTFE shaft seal 12 is provided inside the PTFE slide 3 and located on the PTFE reciprocating shaft 13. The PTFE shaft seal 12 adopts a Y-type nitrile rubber sealing ring.

[0025] In this embodiment, the liquid storage tank 1 and the PTFE rod are sealed by PTFE packing 6 to prevent seawater from overflowing. To achieve a sealing effect between the PTFE sleeve 11 and the PTFE reciprocating shaft 13, a Y-type nitrile rubber sealing ring is used to prevent leakage during the reciprocating motion of the PTFE shaft 13.

[0026] Example 4 The experimental apparatus for simulating metal corrosion in a dynamic seawater environment disclosed in this embodiment includes a storage tank 1 for holding a corrosive liquid. A PTFE sleeve 11 is installed on the side wall of the storage tank 1. A PTFE slide rail 3 is provided inside the PTFE sleeve 11. A PTFE reciprocating shaft 13 is slidably and sealed inside the PTFE slide rail 3. One end of the PTFE reciprocating shaft 13 is connected to a PTFE disc 21, which is located inside the storage tank 1. The other end of the PTFE reciprocating shaft 13 is connected to a driving device, which drives the PTFE reciprocating shaft 13 to reciprocate along the PTFE slide rail 3. Multiple PTFE rods are inserted through the top of the storage tank 1, and each rod extends into the storage tank 1. A sample is connected to the end of the rod extending into the inner cavity of the storage tank 1. A first support 7 is connected to the top of the storage tank 1, and the PTFE rods pass through the first support 7 and the storage tank 1. A fixing rubber ring 7-1 is provided at the point where the PTFE rods pass through the first support 7.

[0027] The structure disclosed in this embodiment can be used for static seawater rotating sample corrosion studies. A block sample 4 is fixed under a PTFE rod 5 and immersed in seawater for corrosion testing. A cylindrical sample 4-1, connected to a DC speed-regulating motor 8 via a PTFE rod, is immersed in seawater and rotated at an adjustable speed to test the corrosion rate of the cylindrical sample 4-1 under different rotational speeds.

[0028] Example 5 The experimental apparatus for simulating metal corrosion in a dynamic seawater environment disclosed in this embodiment includes a storage tank 1 for holding a corrosive liquid. A PTFE sleeve 11 is installed on the side wall of the storage tank 1. A PTFE slide rail 3 is provided inside the PTFE sleeve 11. A PTFE reciprocating shaft 13 is slidably and sealed inside the PTFE slide rail 3. One end of the PTFE reciprocating shaft 13 is connected to a PTFE disc 21, which is located inside the storage tank 1. The other end of the PTFE reciprocating shaft 13 is connected to a driving device, which drives the PTFE reciprocating shaft 13 to reciprocate along the PTFE slide rail 3. Multiple PTFE rods are inserted through the top of the storage tank 1, and each rod extends into the storage tank 1. A sample is connected to the end of the rod extending into the inner cavity of the storage tank 1. A first support 7 is connected to the top of the storage tank 1, and the PTFE rods pass through the first support 7 and the storage tank 1. A fixing rubber ring 7-1 is provided at the point where the PTFE rods pass through the first support 7. The top of the liquid storage tank 1 is equipped with a DC speed-regulating motor 8. One end of the PTFE rod protrudes from the liquid storage tank 1 and is connected to the DC speed-regulating motor 8. A sealant 10 is provided between the DC speed-regulating motor 8 and the liquid storage tank 1. The top of the liquid storage tank 1 is also equipped with a second bracket 9 for installing the DC speed-regulating motor 8.

[0029] The structure disclosed in this embodiment can be used for dynamic seawater rotating sample corrosion studies. A cylindrical sample 4-1, connected to a DC speed-regulating motor 8 via a second PTFE rod 5-1, is immersed in seawater. The drive device of the reciprocating pump piston cylinder 14 is activated, causing the PTFE disc 21 inside the storage tank 1 to reciprocate via the reciprocating pump shaft 16. This creates waves in the corrosive liquid, simulating the scouring effect of ocean waves in a marine environment, and allows for the study of the corrosion behavior of metallic materials in dynamic seawater.

[0030] The structure disclosed in this embodiment can be used for dynamic testing alone, or it can be used together with the structure disclosed in Embodiment 4 for dynamic and static testing.

[0031] Example 6 The experimental apparatus for simulating metal corrosion in a dynamic seawater environment disclosed in this embodiment includes a storage tank 1 for holding a corrosive liquid. A PTFE sleeve 11 is installed on the side wall of the storage tank 1. A PTFE slide rail 3 is provided inside the PTFE sleeve 11. A PTFE reciprocating shaft 13 is slidably and sealed inside the PTFE slide rail 3. One end of the PTFE reciprocating shaft 13 is connected to a PTFE disc 21, which is located inside the storage tank 1. The other end of the PTFE reciprocating shaft 13 is connected to a driving device, which drives the PTFE reciprocating shaft 13 to reciprocate along the PTFE slide rail 3. Multiple PTFE rods are installed through the top of the storage tank 1, and each rod extends into the storage tank 1. A sample is connected to the end of each rod that extends into the inner cavity of the storage tank 1. A drain pipe 19 is connected to the bottom of the storage tank 1, and a drain valve 20 is installed on the drain pipe 19.

[0032] In this embodiment, in order to facilitate the discharge of corrosive liquid, the opening and closing of the drain valve 20 can control the discharge of corrosive liquid along the drain pipe 19.

[0033] Based on Examples 1-6, the liquid storage tank 1 is made of carbon steel, and the inner wall of the liquid storage tank 1 is coated with an epoxy resin coating 2. The liquid storage tank 1 is welded from ordinary carbon steel. The liquid storage tank 1 includes a shell and a cover plate, and the cover plate is made of flexible PTFE sheet 10-1. Several sealing openings are opened on the cover plate for placing and fixing the test sample in a non-test state.

[0034] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0035] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0036] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An experimental apparatus for simulating metal corrosion in a dynamic seawater environment, characterized in that, The system includes a storage tank (1) for holding corrosive liquid. A PTFE sleeve (11) is provided on the side wall of the storage tank (1). A PTFE slide (3) is provided inside the PTFE sleeve (11). A PTFE reciprocating shaft (13) is slidably and sealed inside the PTFE slide (3). One end of the PTFE reciprocating shaft (13) is connected to a PTFE disc (21), which is located inside the storage tank (1). The other end of the PTFE reciprocating shaft (13) is connected to a driving device, which is used to drive the PTFE reciprocating shaft (13) to reciprocate along the PTFE slide (3). A plurality of PTFE rods are provided through the top of the storage tank (1). All of the PTFE rods extend into the storage tank (1). A sample is connected to the end of the PTFE rod that extends into the inner cavity of the storage tank (1).

2. The experimental apparatus for simulating metal corrosion in a dynamic seawater environment according to claim 1, characterized in that, The driving device includes a reciprocating pump piston cylinder (14), inside which is provided a reciprocating pump piston (15), and a reciprocating pump shaft (16) is connected through the center of the reciprocating pump piston (15). One end of the reciprocating pump shaft (16) passes through the reciprocating pump piston cylinder (14) and is connected to the PTFE reciprocating shaft (13). The other end of the reciprocating pump shaft (16) passes through the reciprocating pump piston cylinder (14) and is connected to a reciprocating pump thrust plate (17). The reciprocating pump thrust plate (17) abuts against an eccentric wheel (18), and the eccentric wheel (18) is connected to a power source. The power source is used to drive the eccentric wheel (18) to perform eccentric rotational motion.

3. The experimental apparatus for simulating metal corrosion in a dynamic seawater environment according to claim 1, characterized in that, The liquid storage tank (1) is provided with PTFE packing (6) at the PTFE rod penetration point.

4. The experimental apparatus for simulating metal corrosion in a dynamic seawater environment according to claim 1, characterized in that, The top of the liquid storage tank (1) is connected to a first bracket (7), and the PTFE rod passes through the first bracket (7) and the liquid storage tank (1). The first bracket (7) is provided with a fixing rubber ring (7-1) at the point where the PTFE rod passes through.

5. The experimental apparatus for simulating metal corrosion in a dynamic seawater environment according to claim 4, characterized in that, The top of the liquid storage tank (1) is provided with a DC speed-regulating motor (8), and one end of the PTFE rod protruding from the liquid storage tank (1) is connected to the DC speed-regulating motor (8). A sealant (10) is provided between the DC speed-regulating motor (8) and the liquid storage tank (1). The top of the liquid storage tank (1) is also provided with a second bracket (9) for installing the DC speed-regulating motor (8).

6. The experimental apparatus for simulating metal corrosion in a dynamic seawater environment according to claim 1, characterized in that, The bottom of the storage tank (1) is connected to a drain pipe (19), and a drain valve (20) is provided on the drain pipe (19).

7. The experimental apparatus for simulating metal corrosion in a dynamic seawater environment according to claim 1, characterized in that, An A / B adhesive is provided between the liquid storage tank (1) and the PTFE sleeve (11).

8. The experimental apparatus for simulating metal corrosion in a dynamic seawater environment according to claim 1, characterized in that, A PTFE shaft seal (12) is provided inside the PTFE slide (3) and on the PTFE reciprocating shaft (13), and the PTFE shaft seal (12) adopts a Y-type nitrile rubber sealing ring.

9. The experimental apparatus for simulating metal corrosion in a dynamic seawater environment according to any one of claims 1-8, characterized in that, The liquid storage tank (1) is made of carbon steel, and the inner wall of the liquid storage tank (1) is coated with an epoxy resin coating (2).

10. The experimental apparatus for simulating metal corrosion in a dynamic seawater environment according to any one of claims 1-8, characterized in that, The liquid storage tank (1) includes a shell and a cover plate, the cover plate being made of flexible PTFE plate (10-1).

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