Environmental box for ocean engineering material corrosion test and test system

Abstract

The utility model provides an environmental box and a test system for ocean engineering material corrosion test, the environmental box comprises a box body and an upper cover assembly, the upper cover assembly is arranged at the upper part of the box body, the box body and the upper cover assembly are matched and sealed to form a chamber required by the corrosion test, and a corrosion medium test environmental condition is formed in the chamber. The environment box comprises a cavity, at least two samples can be arranged in the cavity, the environment box further comprises a high-speed spraying assembly, the high-speed spraying assembly corresponds to the samples and is used for spraying a high-speed test medium to the surfaces of the samples, and the test medium comprises a liquid medium and / or a gas medium. According to the utility model, through the arrangement of the high-speed jet assembly, the environment state of a ship during operation can be simulated, and the corrosion fatigue performance research of an ocean engineering material in various ocean environments can be realized; by arranging the multiple samples in the cavity, batch testing of the multiple samples in the same environment can be achieved, the testing efficiency is improved, and the testing period is shortened.

Description

Technical Field

[0001] This utility model relates to the field of fatigue testing technology for marine engineering materials, and more specifically, to an environmental chamber and testing system for corrosion testing of marine engineering materials. Background Technology

[0002] Corrosion and related stress corrosion and corrosion fatigue are among the main forms of failure of marine engineering materials, posing a great threat to various marine engineering projects. Obtaining corrosion behavior parameters of marine engineering materials through experiments is an important foundation for marine engineering design, marine engineering material research and development and application.

[0003] The factors leading to material corrosion are numerous and complex. Internal factors include the material itself (primarily determined by composition, microstructure, and internal stress state), with different materials exhibiting different corrosion characteristics. External factors include environmental and load conditions. For marine engineering materials, environmental conditions affecting corrosion mainly include the salinity, temperature, oxygen content, and microorganisms of the surrounding seawater, as well as the temperature, humidity, and oxygen content of the surrounding air. Load conditions affecting corrosion include constant stress loads, slow strain loads, and alternating cyclic loads. The safe and reliable application of marine engineering materials requires rational material selection, optimized design, and strengthened protective measures, which presupposes mastering the corrosion performance data of marine engineering materials under various environmental and load conditions. Because the corrosion performance of materials is influenced by numerous factors and the experimental data is highly dispersed, a relatively complete set of corrosion performance data for a single material requires extensive testing, including material corrosion data under a series of load conditions in different corrosive environments.

[0004] Currently, the corrosion performance data of marine engineering materials that have been put into practical application mainly fall into the following categories: (1) Material exposure test data under various real marine environments (such as real marine strip tests). These are mainly corrosion data of materials after being exposed to a specific real marine environment for a certain period of time. This type of test data truly reflects the influence of environment and time on the corrosion behavior of materials, but it has many shortcomings: on the one hand, generally no load is applied in this type of test, so the coupling effect of environment and load is not reflected; on the other hand, the test environment conditions are singular and cannot be precisely controlled, which can only reflect the environment of a specific sea area and is difficult to cover other sea areas; in addition, the test cycle is long, generally in the form of years. (2) Material exposure test data under various laboratory simulated environments (such as indoor accelerated corrosion tests). The main data are corrosion data of materials exposed to a specific simulated environment for a certain period of time. This type of test data can reflect the influence of specific environmental factors such as temperature and salinity of liquid media, temperature and humidity of air media on the corrosion behavior of materials. It is simple, convenient, controllable and relatively short test cycle. However, this type of test also has the shortcomings of not applying load and failing to reflect the coupling effect of environment and load. (3) Material load test data under various laboratory simulated environments (such as stress corrosion test, corrosion fatigue test, etc.). This mainly refers to the corrosion failure data of materials subjected to specific loads exposed to a specific simulated environment for a period of time. This type of test data can effectively reflect the combined effect of environment and load on the corrosion behavior of materials and can be directly applied to the design of marine engineering structures. However, at present, this type of test is mainly based on single sample test, the test efficiency is relatively low, and the environmental conditions between different tests are difficult to unify, affecting the comparability and effectiveness of the data. At the same time, the environmental conditions of this type of test are generally fixed and the test process lacks adjustability, and the simulation of the actual marine environment is relatively weak.

[0005] Chinese patent CN202021609840.5 discloses a corrosion fatigue testing device simulating a marine atmospheric environment. This device combines salt spray testing with fatigue testing to evaluate the corrosion fatigue performance of metallic materials in a marine atmospheric environment. The device has a simple structure and is easy to install and disassemble. It controls the temperature of the test chamber through a water bath device, controls the humidity through a humidification device, and monitors the temperature and humidity of the test chamber in real time, thus achieving adjustable and controllable real-time monitoring of key environmental factors and simulating corrosion fatigue performance in various marine atmospheric environments. While this patent can combine salt spray testing with fatigue testing for corrosion fatigue testing, it can only simulate the atmospheric environment of the ocean and cannot simulate the seawater environment. Furthermore, marine engineering materials are not statically immersed in seawater; for example, during ship operation, there is high-speed impact between the seawater or marine atmosphere and the ship. This patent cannot study the impact of such high-speed impacts on the corrosion fatigue of ship plate materials. Utility Model Content

[0006] The technical problem solved by this utility model is that existing methods for detecting the corrosion performance of marine engineering materials cannot coordinate the combined effects of different environmental and load factors, nor can they simulate the actual environment in which ships operate at high speeds, nor can they study the corrosion fatigue of ship plate materials during ship operation. Furthermore, existing test systems have relatively low test efficiency and long test cycles.

[0007] This utility model discloses an environmental chamber for corrosion testing of marine engineering materials, including a chamber body and a top cover assembly. The top cover assembly is disposed on the upper part of the chamber body, and the chamber body and the top cover assembly are sealed together to form a chamber required for corrosion testing. A corrosive medium test environment is formed in the chamber. At least two samples can be placed in the chamber. The environmental chamber also includes a high-speed jet assembly, which is arranged corresponding to the sample and is used to spray a high-speed test medium onto the sample surface. The test medium includes a liquid medium and / or a gaseous medium.

[0008] Furthermore, the high-speed jet assembly includes a high-pressure mass inlet pipeline, a high-pressure medium pipeline, and a high-speed medium nozzle. The first end of the high-pressure mass inlet pipeline is connected to a medium source outside the environmental chamber, and the second end is connected to the high-pressure medium pipeline. It is used to transport the test medium provided by the medium source to the high-pressure medium pipeline. The high-pressure medium pipeline is arranged in the chamber. The high-speed medium nozzle is connected to the high-pressure medium pipeline and is correspondingly set to the sample. It is used to spray the high-pressure test medium at high speed toward the sample.

[0009] Furthermore, each sample is equipped with one or more high-speed media nozzles.

[0010] Furthermore, when the sample is provided with two or more high-speed media nozzles, the high-speed media nozzles are evenly distributed circumferentially around the radial direction of the sample.

[0011] Furthermore, one or more lower clamping through holes are provided on the bottom plate of the box body, and one or more upper clamping through holes are provided on the upper cover assembly. The lower clamping through holes and the upper clamping through holes are provided in a one-to-one correspondence. The sample and / or clamping assembly are placed between any corresponding set of lower clamping through holes and upper clamping through holes.

[0012] Furthermore, an upper sealing sleeve is provided near the upper end of the sample. The first end of the upper sealing sleeve is sealed on the outer periphery of the sample, and the second end of the upper sealing sleeve is provided with a skirt extending outward in the circumferential direction. The skirt is used to seal with the upper surface of the upper cover assembly. A lower sealing sleeve is provided near the lower end of the sample. An upwardly protruding flange is provided on the upper surface of the base plate around the lower clamp through hole. The first end of the lower sealing sleeve is sealed on the sample, and the second end of the lower sealing sleeve is sealed on the flange.

[0013] Furthermore, the upper and lower sealing sleeves are made of a material that is inert to the test environment and has a certain degree of elasticity.

[0014] Furthermore, the upper cover assembly includes end cover plates and a middle cover assembly. There are two end cover plates, which are respectively disposed at both ends of the upper cover assembly. There is one or more middle cover assemblies, which are disposed between the two end cover plates. The middle cover assembly includes a middle upper cover plate and a middle lower cover plate. The middle upper cover plate and the middle lower cover plate are joined by inclined surfaces to form the middle cover assembly. The upper clamp is disposed between the end cover plate and the middle upper cover plate, and / or, the upper clamp is disposed between the end cover plate and the middle lower cover plate, and / or, the upper clamp is disposed between the middle upper cover plate and the middle lower cover plate.

[0015] Furthermore, the inclination angle of the inclined plane is between 45° and 75°.

[0016] Furthermore, both the housing and the top cover assembly are sandwich structures. The surfaces that come into contact with the test environment are made of materials that are inert to the test environment conditions, while the core is made of heat-insulating material.

[0017] Furthermore, the high-speed injection component is made of a material that is inert to the test environment conditions.

[0018] Furthermore, one or more liquid inlet pipes and at least one liquid outlet pipe are provided at the lower part of the side wall of the chamber. The liquid inlet pipe is used to deliver the liquid medium for corrosion testing into the chamber, and the liquid outlet pipe is used to discharge the liquid medium from the chamber.

[0019] Furthermore, one or more air inlet pipes and at least one air outlet pipe are provided on the upper part of the side wall of the chamber. The air inlet pipe is used to deliver the gaseous medium for corrosion testing into the chamber, and the air outlet pipe is used to discharge the gaseous medium from the chamber.

[0020] This utility model also discloses a corrosion testing system for marine engineering materials, including the environmental chamber for corrosion testing of marine engineering materials as described above.

[0021] Compared with existing technologies, the environmental chamber and testing method for corrosion testing of marine engineering materials described in this utility model have the following advantages:

[0022] 1. By setting up high-speed jet components, the environmental conditions in which ships operate can be simulated, which helps to study the corrosion fatigue performance of marine engineering materials in various marine environments;

[0023] 2. By setting up air inlet pipes, air outlet pipes, liquid inlet pipes, and liquid outlet pipes, it is possible to simulate the corrosion environment of typical sea areas around the world, and achieve comprehensive coordination of different environmental factors;

[0024] 3. By setting up multiple samples in the chamber, batch testing of multiple samples in the same environment can be achieved, which improves testing efficiency and shortens the testing cycle;

[0025] 4. The environmental chamber and testing system provided by this utility model have a simple structure and are easy to use, which significantly improves the efficiency of corrosion testing of marine engineering materials. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the experimental principle of the experimental system described in this embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the loading system described in an embodiment of the present utility model;

[0028] Figure 3 This is a schematic diagram of the structure of the loading bracket described in an embodiment of the present utility model;

[0029] Figure 4 This is a schematic diagram of the crossbeam structure described in an embodiment of the present utility model;

[0030] Figure 5 This is a schematic diagram of the structure of the base described in an embodiment of the present utility model;

[0031] Figure 6 This is a schematic diagram of the structure of the column described in an embodiment of the present utility model;

[0032] Figure 7 The diagram shows the load-bearing capacity analysis when the four actuators at the center are fully loaded simultaneously. (a) is a schematic diagram of the Mises equivalent stress distribution of the crossbeam, (b) is a schematic diagram of the Mises equivalent stress distribution of the base, (c) is a schematic diagram of the z-direction displacement distribution of the crossbeam, and (d) is a schematic diagram of the z-direction displacement distribution of the base.

[0033] Figure 8 The diagram shows the load-bearing capacity analysis when all 16 actuators are fully loaded simultaneously. (a) is a schematic diagram of the Mises equivalent stress distribution of the crossbeam, (b) is a schematic diagram of the Mises equivalent stress distribution of the base, (c) is a schematic diagram of the z-direction displacement distribution of the crossbeam, and (d) is a schematic diagram of the z-direction displacement distribution of the base.

[0034] Figure 9 This is a schematic diagram of the actuator and sample clamping structure according to an embodiment of the present invention;

[0035] Figure 10These are schematic diagrams of two different structures of the sample described in the embodiments of this utility model;

[0036] Figure 11 This is a schematic diagram of the structure of the first clamp described in an embodiment of the present utility model;

[0037] Figure 12 This is a schematic diagram of the structure of the second clamp described in an embodiment of the present utility model;

[0038] Figure 13 This is a schematic diagram of the structure of the third clamp described in an embodiment of the present utility model;

[0039] Figure 14 This is a schematic diagram of the structure of the fourth clamp described in an embodiment of the present utility model;

[0040] Figure 15 This is a schematic diagram of the structure of the fifth clamp described in this embodiment of the present utility model;

[0041] Figure 16 This is a schematic diagram of the positioning block described in an embodiment of the present utility model;

[0042] Figure 17 This is a schematic diagram of the installation structure of the positioning block according to an embodiment of the present utility model;

[0043] Figure 18 This is a schematic diagram of the structure of the environmental chamber described in an embodiment of the present utility model;

[0044] Figure 19 This is a schematic diagram of the structure when the environmental chamber base is covered with an anti-corrosion rubber pad and the sealing sleeve is installed on the clamp assembly, as described in this embodiment of the utility model.

[0045] Figure 20 This is a schematic diagram illustrating the high-speed rinsing of a sample other than the rubber sleeve using a high-speed medium, as described in an embodiment of this utility model.

[0046] Figure 21 This is a schematic diagram of the liquid medium control device described in an embodiment of the present invention;

[0047] Figure 22 This is a schematic diagram of the gas medium control device described in an embodiment of the present invention.

[0048] Explanation of reference numerals in the attached figures:

[0049] 100. Environmental chamber; 110. Chamber body; 111. Lower clamp through hole; 112. Flange; 120. Upper cover assembly; 121. End cover plate; 122. Middle and upper cover plate; 123. Middle and lower cover plate; 124. Upper clamp through hole; 125. Inclined surface; 1251. First inclined surface; 1252. Second inclined surface; 130. High-speed jet assembly; 131. High-pressure mass inlet pipeline; 132. High-pressure medium pipeline; 133. High-speed medium nozzle; 140. Liquid inlet pipeline; 150. Liquid outlet pipeline; 16 0. Inlet pipe; 170. Outlet pipe; 200. Sample; 220. Upper sealing sleeve; 230. Lower sealing sleeve; 300. Loading bracket; 310. Crossbeam; 311. First main board; 312. First transverse stiffener; 313. First longitudinal stiffener; 320. Base; 321. Second main board; 322. Second transverse stiffener; 323. Second longitudinal stiffener; 324. T-slot; 325. Corrosion-resistant rubber pad; 330. Column; 331. Support section; 332. Fastening section; 333. Fastening Nut; 400, Clamp assembly; 410, First clamp; 420, Second clamp; 430, Third clamp; 440, Fourth clamp; 450, Fifth clamp; 460, Positioning block; 461, Blind hole; 462, Positioning screw hole; 463, V-groove; 470, Positioning screw; 480, Compression spring; 500, Actuator; 600, Liquid medium regulating device; 610, Upper housing; 620, Lower housing; 621, Heat exchanger; 622, Injection port; 623, Return port; 62 4. Oxygen injection port; 630. Drainage port; 640. Brine solenoid valve; 650. Freshwater solenoid valve; 660. Parameter sensor; 670. Liquid level sensor; 680. High-concentration brine tank; 700. Gas medium control device; 710. Gas tank; 711. Gas injection port; 712. Gas return port; 713. Humidification port; 714. Temperature control device; 715. Air exchange inlet; 716. Air exchange outlet; 717. Temperature sensor; 718. Humidity sensor; 719. Oxygen content sensor. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the described embodiments are only some, not all, of the embodiments of this utility model. The specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. It should be noted that, unless otherwise specified, the embodiments and features described in the present utility model can be combined with each other.

[0051] The following describes in detail, with reference to the accompanying drawings, an environmental chamber and testing system for corrosion testing of marine engineering materials according to an embodiment of the present invention.

[0052] Example 1

[0053] This embodiment provides an environmental chamber for corrosion testing of marine engineering materials, such as... Figure 18 As shown, the chamber includes a housing 110 and a cover assembly 120. The cover assembly 120 is disposed on the upper part of the housing 110. The housing 110 and the cover assembly 120 are sealed together to form a chamber required for corrosion testing. A corrosive medium test environment is formed in the chamber. At least two samples 200 can be placed in the chamber. The environmental chamber 100 also includes a high-speed jet assembly 130, which is correspondingly arranged with the sample 200 and is used to spray a high-speed test medium onto the surface of the sample 200. The test medium includes a liquid medium and / or a gaseous medium.

[0054] It should be noted that the sample 200 is fixedly installed in the environmental chamber 100 under load. The fixing method can refer to existing technology or use the fixing method described later in this application. The chamber 110 serves as a container for creating the test environment. This arrangement allows for the simultaneous spraying of high-speed test media onto the surface of the sample 200 during corrosion testing of marine engineering materials, thereby simulating the operating conditions of a ship and enabling comprehensive corrosion testing of the marine engineering materials. Existing environmental chambers typically only support tests at low flow rates and cannot simulate the operating conditions of a ship, thus failing to conduct comprehensive and effective corrosion tests. It should be noted that multiple samples 200 can be placed in the environmental chamber 100, facilitating batch testing. It should be noted that the high-speed test media sprayed by the high-speed spray assembly 130 has a flow rate of 1-20 m / s.

[0055] As an embodiment of this utility model, such as Figure 18 As shown, the high-speed jet assembly 130 includes a high-pressure mass inlet pipe 131, a high-pressure medium pipe 132, and a high-speed medium nozzle 133. The first end of the high-pressure mass inlet pipe 131 is connected to a medium source outside the environmental chamber 100, and the second end is connected to the high-pressure medium pipe 132, used to transport the test medium provided by the medium source to the high-pressure medium pipe 132. The high-pressure medium pipe 132 is arranged in the chamber. The high-speed medium nozzle 133 is connected to the high-pressure medium pipe 132 and is correspondingly arranged with respect to the sample 200, used to spray the high-pressure test medium at high speed onto the sample 200. The corresponding arrangement of the high-speed medium nozzle 133 with respect to the sample 200 effectively ensures that the surface of the sample 200 receives the high-speed, high-pressure test medium during the test, thereby effectively simulating the working environment of a ship during operation.

[0056] Optionally, each sample 200 may be provided with one or more high-speed media nozzles 133. One or more high-speed media nozzles 133 help to spray the surface of the sample 200 circumferentially, which helps to obtain comprehensive and complete test results in the corrosion test of marine engineering materials.

[0057] As an embodiment of this utility model, such as Figure 18 As shown, when the sample 200 is provided with two or more high-speed media nozzles 133, the high-speed media nozzles 133 are evenly distributed circumferentially around the radial direction of the sample 200. Preferably, one or more high-speed media nozzles 133 are also provided in the vertical direction of the sample 200. Through the above arrangement, the circumferential surface of the sample 200 is uniformly sprayed, thereby making the test results more accurate. It should be noted that the number and size of the high-speed media nozzles 133 can be specifically set according to the test requirements, and are not limited here.

[0058] In this embodiment, as Figure 18 As shown, one or more lower clamping through holes 111 are provided on the bottom plate of the housing 110, and one or more upper clamping through holes 124 are correspondingly provided on the upper cover assembly 120. The lower clamping through holes 111 and the upper clamping through holes 124 are arranged in a one-to-one correspondence. The sample 200 and / or the clamping assembly 400 are placed between any corresponding set of lower clamping through holes 111 and upper clamping through holes 124. Through the above arrangement, the upper and lower ends of the sample 200 can be fixed with the clamping assembly 400, and the clamping assembly 400 can be connected to a loading device such as an actuator 500 or a mechanical testing machine, so that the sample 200 is loaded while the corrosion test is being performed, making the environment in which the sample 200 is placed closer to the actual use environment, and enabling more accurate detection of the fatigue corrosion performance of marine engineering materials. The environmental chamber 100 provided in this embodiment can create a certain test environment for batch of samples 200 without affecting the application of force load to the samples 200. The test environment includes: a circulating liquid immersion environment, an environment in which the samples 200 are sprayed with high-speed medium (preferably high-speed spraying of liquid medium), a circulating gas environment, a circulating liquid and gas mixed environment, and a liquid spraying and circulating gas mixed environment, etc.

[0059] As an optional embodiment of this utility model, an upper sealing sleeve 220 is provided near the upper end of the sample 200. The first end of the upper sealing sleeve 220 is sealed and fitted on the outer periphery of the sample 200, and the second end of the upper sealing sleeve 220 is provided with a skirt extending outward in the circumferential direction. The skirt is used to cooperate and seal with the upper surface of the upper cover assembly 120. A lower sealing sleeve 230 is provided near the lower end of the sample 200. A flange 112 is provided circumferentially around the lower clamp through hole 111 on the upper surface of the base plate. The first end of the lower sealing sleeve 230 is sealed and fitted on the sample 200, and the second end of the lower sealing sleeve 230 is sealed and fitted on the flange 112. It should be understood that the arrangement of the upper clamp through hole 124 and the lower clamp through hole 111 can easily lead to leakage of gaseous and liquid media through the holes or the surface of the sample 200, causing changes in the test environment conditions and thus affecting the test results. The upper sealing sleeve 220 and the lower sealing sleeve 230 are used to seal the upper clamp through hole 124, the lower clamp through hole 111, and the surface of the sample 200, respectively, thereby effectively preventing leakage of the test medium and ensuring the stability of the test process. Specifically, the lower clamp of the loading device passes through the lower clamp through hole 111 and connects to the lower end of the sample 200. The first end of the lower sealing sleeve 230 is fitted onto the sample 200 near the lower clamp and is secured and sealed by a certain fastening device (such as a strapping tape). The second end of the lower sealing sleeve 230 is fitted onto the cup-shaped flange 112 on the circumference of the lower clamp through hole 111 and is secured and sealed by a certain fastening device (such as a strapping tape). The upper clamp of the loading device passes through the upper clamp through hole 124 on the upper cover assembly 120 and connects to the sample 200. At the upper end of 00, the first end of the upper sealing sleeve 220 is fitted onto the sample 200 near the upper clamp and is secured and sealed by a certain fastening device (such as a strapping tape). The second end of the upper sealing sleeve 220 is provided with a skirt. When the end cover plate 121, the upper middle cover plate 122, and the lower middle cover plate 123 are combined and placed on the box body 110, the skirt of the upper sealing sleeve 220 covers the edge of the upper clamp through hole 124 on the end cover plate 121, the upper middle cover plate 122, and the lower middle cover plate 123, and then the seal is achieved by adhesive or tape bonding.

[0060] Optionally, the upper sealing sleeve 220 and the lower sealing sleeve 230 are made of a material that is inert to the test environment and has a certain degree of elasticity. The upper sealing sleeve 220 and the lower sealing sleeve 230 can be made of rubber or latex, which are not corroded by the test environment and have good elasticity. This design can effectively prevent corrosion by the test medium while ensuring a sealing effect, thereby ensuring the stability of the test environment.

[0061] Specifically, the upper cover assembly 120 includes end cover plates 121 and a middle cover assembly. There are two end cover plates 121, which are respectively disposed at both ends of the upper cover assembly 120. There is one or more middle cover assemblies, which are disposed between two end cover plates 121. The middle cover assembly includes an upper middle cover plate 122 and a lower middle cover plate 123. The upper middle cover plate 122 and the lower middle cover plate 123 are fitted together by an inclined surface 125 to form the middle cover assembly. The inclined surface 125 is used for the relative sliding installation of the upper middle cover plate 122 and the lower middle cover plate 123. The upper clamp is disposed between the end cover plate 121 and the upper middle cover plate 122 through a hole 124, and / or, the upper clamp is disposed between the end cover plate 121 and the lower middle cover plate 123 through a hole 124, and / or, the upper clamp is disposed between the upper middle cover plate 122 and the lower middle cover plate 123 through a hole 124. In one embodiment, the end cover plate 121, the upper middle cover plate 122, and the lower middle cover plate 123 are all arranged in a strip shape. One or more first semi-circular through holes are provided along the length of the side of the end cover plate 121 facing the middle cover assembly. In each middle cover assembly, an inclined surface 125 is provided on the opposing surfaces of the upper middle cover plate 122 and the lower middle cover plate 123. The inclined surface 125 includes a first inclined surface 1251 and a second inclined surface 1252. The first inclined surface 1251 and the second inclined surface 1252 can cooperate to form the inclined surface 125, so that the upper middle cover plate 122 and the lower middle cover plate 123 cooperate to form a rectangle. The first inclined surface 1251 is provided in one of the upper middle cover plate 122 and the lower middle cover plate 123. On one of the upper and lower cover plates 123, the second inclined surface 1252 is disposed on the other of the upper and lower cover plates 122 and 123. The upper and lower cover plates 122 and 123 are provided with one or more second semicircular through holes along the length direction on the side away from the inclined surface 125. The second semicircular through holes on the side of the middle cover assembly connected to the end cover plate 121 have the same diameter and number as the first semicircular through holes. The diameter and number of the second semicircular through holes between the two interconnected middle cover assemblies are the same. The second semicircular through holes are arranged opposite to the first semicircular through holes or the second semicircular through holes on another middle cover assembly to form an upper clamping through hole 124.In one specific embodiment, the upper cover plate 122 has a first inclined surface 1251 on its side away from the end cover plate 121, and one or more second semicircular through holes along its length on its other side. The lower cover plate 123 has a second inclined surface 1252 on its side facing the upper cover plate 122, and one or more second semicircular through holes along its length on its side away from the upper cover plate 122. The number of second semicircular through holes in both surfaces can be the same or different. The first inclined surface 1251 is a surface that gradually extends from bottom to top towards the lower cover plate 123, and the second inclined surface 1252 is a surface that gradually extends from bottom to top away from the upper cover plate 122. In this case, during installation, after the sample 200, the upper sealing sleeve 220, and the lower sealing sleeve 230 are installed, when installing the upper cover assembly 120, An end cover plate 121 is provided near the end of the housing 110. A middle cover assembly is provided between the two end cover plates 121. During installation, the lower middle cover plate 123 is first installed in place. Then, the first inclined surface 1251 of the upper middle cover plate 122 and the second inclined surface 1252 of the lower middle cover plate 123 are slid together until the installation of the upper middle cover plate 122 is completed. After the upper middle cover plate 122 is installed in place, the skirt of the upper sealing sleeve 220 is sealed with the upper surface of the end cover plate 121 and / or the upper middle cover plate 122 and / or the lower middle cover plate 123. This is because, in order to ensure the sealing effect, the outer diameter of the upper sealing sleeve 220 is sealed with the inner surface of the upper clamp through hole 124. In addition, the skirt is provided. Under these circumstances, it will be difficult to assemble the upper cover assembly 120. The upper cover assembly 120 can be easily assembled by sliding between the inclined surfaces 125.

[0062] In one preferred embodiment, the inclination angle of the inclined surface 125 is between 45° and 75°. This angle setting allows the upper cover plate 122 and the lower cover plate 123 to be smoothly installed in place during sliding.

[0063] Optionally, both the chamber 110 and the top cover assembly 120 are sandwich structures, with the surfaces in contact with the test environment made of a material inert to the test environment conditions, and the core being a thermal insulation material. It should be noted that the chamber 110 and the top cover assembly 120 can also be made of a double-layer composite material, where the surfaces in contact with the test environment are made of a material inert to the test environment conditions, and the outer layer is a thermal insulation material. Optionally, the inert material on the surfaces of the chamber 110 and the top cover assembly 120 in contact with the test environment can be 316L or other materials uncorroded by the test medium, and the core or outer layer can be polyurethane or other thermal insulation materials. Through the above configuration, corrosion of the chamber 110 and the top cover assembly 120 during use can be avoided, and the external temperature of the environmental chamber 100 can be prevented from affecting the test environment temperature inside the chamber, ensuring the stability of the test environment and contributing to obtaining more accurate test results.

[0064] Optionally, the high-speed injection assembly 130 is made of a material that is inert to the test environment. The high-pressure inlet pipeline 131, the high-pressure medium pipeline 132, and the high-speed medium nozzle 133 are all made of materials that are inert to the test environment, such as 316L. These features prevent the high-speed injection assembly 130 from being corroded by the test medium, ensuring the smooth conduct of the test.

[0065] In this embodiment, one or more inlet pipes 140 and at least one outlet pipe 150 are provided at the lower part of the side wall of the chamber 110. The inlet pipe 140 is used to supply the liquid medium for corrosion testing into the chamber, and the outlet pipe 150 is used to discharge the liquid medium from the chamber. The arrangement of the inlet pipes 140 and outlet pipes 150 allows for the formation of a corresponding liquid medium circulation within the chamber, simulating the flow of seawater. It should be understood that the number of inlet pipes 140 and outlet pipes 150 can be adjusted according to the number of samples 200 and the size of the chamber 110. Preferably, the inlet pipes 140 and outlet pipes 150 are made of a material that is inert to the environmental conditions in which they are manufactured, such as 316L. This arrangement prevents the inlet pipes 140 and outlet pipes 150 from being corroded by the test medium, ensuring the smooth and stable conduct of the test. Preferably, the inlet pipe 140 and the outlet pipe 150 are respectively disposed on two opposite side walls of the housing 110.

[0066] In one embodiment of this utility model, one or more air inlet pipes 160 and at least one air outlet pipe 170 are provided on the upper part of the side wall of the chamber 110. The air inlet pipe 160 is used to supply the gaseous medium for corrosion testing into the chamber, and the air outlet pipe 170 is used to discharge the gaseous medium from the chamber. The arrangement of the air inlet pipes 160 and the air outlet pipe 170 allows for a corresponding gaseous medium circulation within the chamber to simulate the state of marine air. It should be understood that the number of air inlet pipes 160 and the air outlet pipe 170 can be adjusted according to the number of samples 200 and the size of the chamber 110. Preferably, the air inlet pipes 160 and the air outlet pipe 170 are made of a material that is inert to the environmental conditions being tested, such as 316L. This arrangement prevents the air inlet pipes 160 and the air outlet pipe 170 from being corroded by the test medium, ensuring the smooth and stable conduct of the test. Preferably, the air intake pipe 160 and the air outlet pipe 170 are respectively disposed on two opposite side walls of the housing 110.

[0067] Example 2

[0068] This embodiment provides an environmental chamber for corrosion testing of marine engineering materials. Its structure is shown in Embodiment 1, and its dimensions and corresponding parameters are as follows:

[0069] 1. Required test environment conditions:

[0070] (1) The liquid medium is an aqueous solution of sodium chloride, with a sodium chloride content of 2.5-4.5% and a temperature of freezing point to 50℃;

[0071] (2) The gas medium is air, the temperature is -60℃ to 50℃, and the relative humidity is 30% to 95%.

[0072] 2. The specimen is in the shape of a round bar with a diameter of 10 mm and a parallel section length of 120 mm; the fixture is in the shape of a round bar with a diameter of 40 mm. There are 16 specimens in total, arranged in a 4×4 matrix, with a center-to-center distance of 300 mm between adjacent specimens.

[0073] 3. Specific parameters of the environmental chamber:

[0074] (1) The internal space of the box is 1200mm long, 1200mm wide and 280mm high; the thickness of the bottom and side walls is 150mm, the two sides are 2mm thick 316L stainless steel plates, and the core is high-density polyurethane.

[0075] (2) The inner diameter of the air inlet pipe and the air outlet pipe is 80mm and the wall thickness is 2mm. They are made of 316L stainless steel and there are 4 sets in total, which are arranged on the opposite side walls of the box.

[0076] (3) The inner diameter of the inlet pipe and the outlet pipe is 20mm, and they are made of 316L stainless steel with a wall thickness of 3mm. There are 4 sets in total, which are arranged on the opposite side walls of the box.

[0077] (4) The inner diameter of the upper clamp through hole and the lower clamp through hole is 85mm, the flange height is 25mm, and the wall thickness is 2mm. They are arranged in a 4×4 matrix, and their dimensions and positions correspond to the positions of the testing machine clamps. The material is 316L stainless steel.

[0078] (5) The inner diameter of the high-pressure mass inlet pipeline and the high-pressure medium pipeline is 15mm and made of 316L stainless steel with a wall thickness of 4mm; the inner diameter of the high-speed medium nozzle is 10mm and the wall thickness is 4mm, the nozzle orifice diameter is 0.3mm and the material is 316L stainless steel. For each sample, a group of 4 nozzles are arranged at a 90° angle to each other. For 16 samples, 16 groups of nozzles are arranged, with the position opposite to the sample and the height from the inner bottom surface of the box is 140mm.

[0079] (6) The inner diameter of the lower sealing sleeve covering the sample portion is 10mm, and the inner diameter of the flange end covering the lower clamp through hole is 90mm. It is made of rubber with a wall thickness of 3mm. The fastening method between the lower sealing sleeve and the sample and the flange of the clamp through hole is to tie it with two straps. The inner diameter of the upper sealing sleeve covering the sample portion is 10mm, the inner diameter of the portion covering the clamp is 90mm, the outer diameter of the skirt is 140mm, and it is made of rubber with a wall thickness of 3mm.

[0080] (7) The thickness of the end cover plate, the upper middle cover plate, and the lower middle cover plate is 100mm. They are made of sandwich structure. The upper and lower surfaces are made of 2mm thick 316L stainless steel, and the core is made of high-density polyurethane material. The upper fixture has 16 through holes with a diameter of 100mm, and the arrangement position corresponds to the sample installation position. There are 2 end cover plates, 4 upper middle cover plates, and 4 lower middle cover plates. The angle between the contact slope and the upper and lower surfaces is 60°.

[0081] Example 3

[0082] This embodiment provides a corrosion testing system for marine engineering materials, including an environmental chamber for corrosion testing of marine engineering materials as described in Embodiment 1 or 2.

[0083] like Figures 1-22 As shown, the test system includes a loading system and an environmental system. The loading system applies corresponding force loads to each specimen 200 according to the set test parameters, including slow strain rate tensile loads and cyclic loads. The environmental system creates corresponding corrosive medium test environment conditions according to the set test parameters. The loading system includes a loading bracket 300, a loading device, and a controller. The loading bracket 300 provides rigid reaction support, and the loading device and controller apply slow strain rate tensile loads or cyclic loads to the specimen 200. The environmental system includes an environmental chamber 100, a liquid medium control device 600, and a gas medium control device 700. The environmental chamber 100 holds the specimen 200 and can hold the test liquid medium and gas medium, which simulate a marine environment. The liquid medium control device 600 controls the technical parameters of the test liquid medium and supplies it to the environmental chamber 100. The gas medium control device 700 controls the technical parameters of the test gas medium and supplies it to the environmental chamber 100. The marine environment is simulated in the environmental chamber 100 by combining liquid and gaseous media, which enables batch corrosion tests and helps improve the efficiency of the tests. In addition, the high-speed jet assembly 130 can simulate the working environment under navigation conditions, which helps to conduct batch studies on the corrosion fatigue of ship plates during operation.

[0084] The applicant conducted a survey of typical global marine environments, the results of which are shown in Table 1. The global atmospheric oxygen content is stable at 21%, while seawater oxygen content is mainly affected by air pressure; higher air pressure results in higher dissolved oxygen levels in seawater. Globally, there are seven pressure belts, with the equator being a low-pressure belt and the poles being high-pressure belts. Therefore, the dissolved oxygen levels in the seawater at the North and South Poles are high, while those at the equator are low. Table 2 shows the design of the experimental environment indicators for this system. Based on the survey results of global marine environmental parameters shown in Table 1, the technical parameter values ​​were set as follows: the salinity of the liquid medium is 1.0–4.5% NaCl to simulate the salinity of seawater in the global marine environment; considering that marine engineering structures and ships are subject to the scouring action of waves, which may affect the corrosion behavior of materials, the flow velocity of the liquid medium is monitored as a technical indicator to improve the experimental effect. Based on the current ship speed, the maximum flow velocity of the high-speed spray liquid medium is set at 20 m / s.

[0085] Table 1 Global Marine Environmental Parameters

[0086]

[0087] Table 2 Test Environment Medium Indicators

[0088]

[0089] The corrosion of marine engineering materials is related not only to the environmental medium but also mainly to the mechanical loads they bear. Currently, the main corrosion tests, in addition to simple corrosive medium exposure tests, are stress corrosion tests and corrosion fatigue tests. This test system aims to realize the functions of slow strain rate tensile corrosion tests and corrosion fatigue tests. The specimen form is planned to be mainly round bar specimens. The force load under various loading stresses and specimen radius conditions shown in Table 3 can be calculated by formula (1). The table shows that the maximum loading stress that can be achieved when using a loading device with a maximum force load of 50kN and a specimen diameter of 3-5mm is 1700MPa (the maximum calculated value of the loading stress is 1768.4MPa), which can cover all the strength grades currently in use and most of the strength grades that may be used in the future for marine engineering materials. Therefore, the maximum force load of this test system is designed to be 50kN. Table 4 shows the setting of load control technical indicators. As an internal control measure, the load control deviation requirements for the 200 loading capacity of a single specimen and the continuous non-stop operation time requirements are improved.

[0090] F=σ·π·r 2 (1)

[0091] Where F is the force applied to the specimen, σ is the applied stress, and r is the specimen radius.

[0092] Table 3 Calculated force loads under different loading stresses and specimen radii.

[0093]

[0094] Table 4 Load Control Technical Specifications Setting

[0095]

[0096] like Figure 2 , Figure 3 As shown, the loading bracket 300 includes a crossbeam 310, a base 320, and a column 330. The column 330 is disposed between the crossbeam 310 and the base 320, with the crossbeam 310 positioned on the upper side of the column 330 and the base 320 positioned on the lower side of the column 330. To ensure that the loading bracket 300 has sufficient rigidity to reduce interference between different samples 200 during the test, the crossbeam 310 and the base 320 are designed as a plate-reinforced structure, i.e., a "main plate + grid-shaped reinforcing plate" structure. The installation position of the loading device and the clamping position of the sample 200 are respectively located at the cross intersection of the grid-shaped reinforcing ribs of the crossbeam 310 and the base 320. The column 330 is connected and fixed to the crossbeam 310 and the base 320 using bolts.

[0097] like Figure 4As shown, the crossbeam 310 includes a first main plate 311, a first transverse stiffener 312, and a first longitudinal stiffener 313. The first main plate 311 is disposed on the lower side of the first transverse stiffener 312 and the first longitudinal stiffener 313. The first main plate 311 is fixedly connected to the column 330. There are two or more first transverse stiffeners 312 and first longitudinal stiffeners 313. The first transverse stiffeners 312 and first longitudinal stiffeners 313 are arranged in a grid pattern. In one embodiment, there are four first transverse stiffeners 312 and four first longitudinal stiffeners 313. The first main plate 311 has a thickness of 100 mm, a length of 1860 mm, and a width of 2070 mm. The first transverse stiffeners 312 and the first longitudinal stiffeners 313 have a thickness of 50 mm and a height of 500 mm. The materials for the first main plate 311, the first transverse stiffeners 312, and the first longitudinal stiffeners 313 can all be steel plates with a yield strength of not less than 235 MPa. The connection between the first main plate 311 and the stiffeners (first transverse stiffeners 312 or first longitudinal stiffeners 313), and between the first transverse stiffeners 312 and the first longitudinal stiffeners 313 can be achieved by manual welding with welding rods or gas shielded welding. The welding materials need to be compatible with the materials used for the first main plate 311 and the stiffeners. The first main plate 311 is equipped with symmetrical column mounting holes machined near its four corners. The radius of the mounting holes is designed to be 56mm (slightly larger than the radius of the column fastening section 332, which is 55mm). Loading device mounting holes are machined on the first main plate 311 near the intersection of the first horizontal stiffening plate 312 and the first vertical stiffening plate 313 in a grid-like structure. (The size and number of mounting holes match the technical parameters of the loading device; preferably, four mounting holes with a radius of 8.5mm are designed for each loading device). The loading devices can be installed below the first main plate 311 of the crossbeam at the center intersection of the thicknesses of the first horizontal stiffening plate 312 and the first vertical stiffening plate 313 using bolt connections. One loading device can be installed at each intersection, for a total of 16 loading devices. In one optional embodiment, the loading devices are configured one-to-one with the specimens 200. The loading devices are actuators 500, and the actuators 500 are configured one-to-one with the specimens 200 to apply the same or different loads to different specimens 200 within the same test cycle.

[0098] like Figure 5As shown, the base 320 includes a second main plate 321, a second horizontal stiffener 322, and a second vertical stiffener 323. The second main plate 321 is disposed on the upper side of the second horizontal stiffener 322 and the second vertical stiffener 323. The second main plate 321 is fixedly connected to the column 330. There are two or more second horizontal stiffeners 322 and second vertical stiffeners 323, which are arranged in a grid pattern. In one embodiment, the second main plate 321 has a thickness of 120mm, a length of 1860mm, and a width of 2070mm. The second horizontal stiffener 322 and the second vertical stiffener 323 have a thickness of 50mm and a height of 500mm. The materials of the base's second main plate 321 and the stiffeners (second horizontal stiffener 322 and second vertical stiffener 323) are the same as those used for the crossbeam 310. The connection between the second main plate 321 and the stiffeners, and between the second horizontal stiffener 322 and the second vertical stiffener 323, can also be achieved using manual welding with welding rods or gas shielded welding. Symmetrical column mounting holes are machined at the four corners of the second main board 321, with a radius of 56mm. Four T-shaped slots 324 for clamping the sample 200 are machined on the surface of the second main board 321 opposite to the crossbeam 310. The center line of the T-shaped slots 324 coincides with the center plane of the thickness of the second longitudinal stiffener 323 on the opposite surface. At the same time, four anchor bolt mounting holes are machined at each of the four corners of the second main board 321 of the base, with the hole diameter matching the anchor bolt (recommended specification M16). A heat insulation layer is set between the base 320 and the foundation during installation.

[0099] like Figure 6 As shown, the column 330 includes a cylindrical support section 331, a cylindrical fastening section 332 with external threads, and a fastening nut 333 that matches the threads of the fastening section 332. The support section 331 has a diameter of 180 mm and mainly serves to bear loads; there are two fastening sections 332 with a diameter of 110 mm, which are respectively inserted into the base 320 and the crossbeam 310, so that the column 330, the base 320, and the crossbeam 310 together form a rigid frame structure. The column 330 is made of steel bars or forgings with a yield strength of not less than 235 MPa.

[0100] The applicant analyzed the load-bearing capacity of the loading bracket 300. The load-bearing capacity of the beam 310 and base 320 of the loading bracket 300 was analyzed using the linear elastic finite element method, while the column 330 was analyzed directly using analytical calculation. The Mises equivalent stress and deformation displacement calculation formulas are shown in equations (2) and (3), respectively. The material was set to low-alloy structural steel (elastic modulus set to 210 GPa, Poisson's ratio set to 0.3). Based on the symmetry of the beam 310 and base 320, a 1 / 4 structure was selected for analysis, and the maximum loading force of a single actuator 500 was set to 50 kN. The analysis results of the load-bearing capacity of the beam 310 and base 320 when all four central actuators 500 are simultaneously fully loaded are as follows: Figure 7 As shown in Table 5, the overall load-bearing capacity of the loading bracket 300 is as follows: the maximum values ​​of the Mises equivalent stress borne by the beam 310 and the base 320 are 28.5 MPa and 78.9 MPa, respectively, both located at the loading points. The ratios to the minimum yield strength (235 MPa) of the material are 12.13% and 33.57%, respectively, both far lower than the minimum yield strength. The maximum displacements of the loading points of the beam 310 and the base 320 in the loading direction (i.e., z-direction) are 0.028 mm and 0.036 mm, respectively, and the maximum disturbance displacements of adjacent loading points are 0.025 mm and 0.024 mm, respectively. The deformation displacement of the column 330 when the four actuators 500 in the center are fully loaded at the same time can be calculated as 0.015 mm. Therefore, the maximum overall deformation displacement of the loading bracket 300 when the four actuators 500 in the center are fully loaded at the same time can be calculated as 0.079 mm, and the disturbance displacement of adjacent loading points is 0.064 mm. Therefore, it can be approximately calculated that the disturbance displacement experienced by adjacent loading points when one actuator 500 is fully loaded is about 0.016 mm. In the actual use of the testing machine, the full-load operation of actuator 500 is an extreme case. The commonly used maximum load of actuator 500 is about 60% of the design range, that is, the commonly used maximum loading force of a single actuator 500 is about 30 kN. Based on the above analysis results, a simple conversion shows that when the loading force of a single actuator 500 is 30 kN, the disturbance displacement experienced by adjacent loading points is about 0.010 mm.

[0101]

[0102] In the formula, Mises equivalent stress for the column support section; The stress in the z-direction (bearing direction) of the column support section; v 柱 L represents the deformation of the column. 柱 F represents the length of the column support section. 柱 The force load borne by a single column; r 柱 E is the radius of the column support section; E is the elastic modulus of the column material (the elastic modulus of steel is set to 210000MPa).

[0103] Table 5. Analysis of the load-bearing capacity of the support frame when all four actuators in the center are fully loaded simultaneously.

[0104]

[0105] The load-bearing capacity analysis results of the crossbeam 310 and base 320 when all actuators 500 simultaneously apply maximum load force (i.e., simultaneously under full load) are as follows: Figure 8 The overall load-bearing capacity of the loading bracket 300 is shown in Table 6. The maximum Mises equivalent stresses borne by the beam 310 and the base 320 are 106.1 MPa and 80.2 MPa, respectively, both located at the connection angle between the horizontal stiffening plate and the main plate near the column mounting hole. The ratios to the minimum yield strength of the material selected in the design (235 MPa) are 45.15% and 34.13%, respectively, both less than half of the minimum yield strength. The maximum displacements of the beam 310 and the base 320 in the loading direction (i.e., the z-direction) are 0.09... 3mm and 0.097mm; the deformation (i.e. displacement) of the column 330 when all actuators 500 are fully loaded at the same time can be calculated as 0.060mm; the maximum deformation displacement of the entire loading bracket 300 when all actuators 500 are fully loaded at the same time can be calculated as 0.250mm (i.e. the sum of the deformation displacements of the three parts: beam 310, base 320 and column 330). Therefore, the interference displacement of the remaining actuator 500 when 15 actuators 500 are fully loaded at the same time can be estimated as 0.234mm according to formula (4). In actual use of the testing machine, the maximum load of the commonly used actuator 500 is about 30kN. When 15 actuators 500 simultaneously apply a loading force of 30kN, the disturbance displacement generated on the remaining loading point is about 0.140mm. In reality, the possibility of 15 actuators 500 simultaneously reaching the commonly used maximum load is not high. The following rough estimate is made: When 16 actuators 500 simultaneously perform loading actions with different frequencies and different load values, assuming that the disturbance of any actuator 500 by the other 15 actuators 500 is equivalent to the other 15 actuators 500 simultaneously reaching half of the commonly used maximum load, the estimated disturbance displacement is about 0.070mm.

[0106]

[0107] Among them, v 干扰 For any one actuator to be displaced by interference from the other 15 actuators; v 梁 v represents the deformation of the beam. 座 This represents the deformation of the base.

[0108] Table 6. Analysis of the load-bearing capacity of the support frame when all actuators are fully loaded simultaneously.

[0109]

[0110] The above analysis results show that the loading bracket 300 maintains an elastic deformation state within the designed load range and has good structural stiffness.

[0111] The actuator 500 is a device installed on the loading bracket 300 to apply a corresponding load to the sample 200 according to the set load control requirements. When the actuator 500 applies a force load to the sample 200, the loading bracket 300 provides rigid support for the actuator 500. Figure 9 The diagram shows the clamping of actuator 500 and specimen 200: Actuator 500 is mounted on the crossbeam 310 of loading bracket 300 by bolt connection; the cylindrical specimen (e.g., Figure 10 (As shown) Both ends of the sample 200 are connected to the actuator 500 via a clamp assembly 400. The clamp assembly 400 includes a first clamp 410, a second clamp 420, a third clamp 430, a fourth clamp 440, a fifth clamp 450, and a positioning block 460. One end of the sample 200 is connected to the first clamp 410 (as shown). Figure 11 (As shown) The first clamp 410 is threaded into the second clamp 420 (as shown). Figure 12 As shown), the contact surface between the two is designed as a spherical surface to enable automatic centering during the loading process of the actuator 500; the upper end of the sample 200 is connected by the first clamp 410, the second clamp 420 and the third clamp 430 (as shown). Figure 13 (As shown) is threadedly connected to the lead screw of the actuator 500; the lower end of the sample 200 is connected to the first clamp 410, the second clamp 420 and the fourth clamp 440 (as shown) Figure 14 (As shown) and the base 320 are connected by a slot, and at the same time, the fifth clamp 450 (as shown) is used to achieve a slot connection. Figure 15 (As shown) The fourth clamp 440, which is snapped into the T-slot 324 on the base 320, is locked in place; to achieve rapid positioning of the sample 200 during installation, a positioning block 460 (such as...) that can be used to match the fourth clamp 440 is provided. Figure 16 As shown), during the debugging phase of the testing machine, the positioning block 460 is installed in the T-shaped slot 324 of the base 320 (as shown). Figure 17 (As shown); In order to apply the "tension-compression" alternating load, when installing the specimen 200, the third clamp 430 and the fourth clamp 440 need to be in contact with the end of the specimen 200 and a certain pre-tightening force needs to be applied to achieve the locking effect, so as to avoid the problem that the specimen 200 cannot be loaded when subjected to the "tension-compression" alternating load.

[0112] Among them, such as Figures 11-15As shown, the first clamp 410 is nut-shaped and threadedly connected to the end of the sample 200. The second clamp 420 has a connecting hole that communicates with a mounting groove in the second clamp 420. The end of the sample 200 passes through the connecting hole into the mounting groove and is threadedly connected to the first clamp 410 fitted inside the mounting groove. The end of the mounting groove away from the connecting hole has a first internal thread for connecting to a third clamp 430 or a fourth clamp 440. One end of the third clamp 430 has a first external thread. The other end is provided with a second internal thread, and the first external thread is used to connect with the first internal thread to achieve a fixed connection between the second clamp 420 and the third clamp 430. The second internal thread is used to fixally connect with the output shaft of the actuator 500 to achieve loading of the sample 200. The fourth clamp 440 includes a threaded section and a base plate. The threaded section is disposed on the base plate, and the end of the threaded section away from the base plate is connected to the first internal thread. The fifth clamp 450 is provided in the shape of a nut and is used to cooperate with the threaded section to fix the fourth clamp 440 to the base 320. Among them, a V-shaped protrusion is provided on the fourth clamp 440, and the V-shaped protrusion is used to cooperate with the positioning block 460 for positioning.

[0113] like Figure 16 , Figure 17 As shown, the positioning block 460 has at least one blind hole 461 near both ends, a positioning screw hole 462 near the center, and a V-groove 463 on one side for engaging with a V-shaped protrusion for quick positioning and installation of the fourth clamp 440. A positioning screw 470 is installed in the positioning screw hole 462, with its end abutting against the bottom of the T-shaped slot 324. A clamping spring is installed in the blind hole 461. Spring 480, one end of the compression spring 480 abuts against the bottom surface of the blind hole 461, and the other end abuts against the inner folded edge of the T-shaped slot 324. When the positioning block 460 is installed, the positioning screw 470 is rotated. Since its end abuts against the bottom of the T-shaped slot 324, the positioning block 460 moves away from the bottom of the T-shaped slot 324 under the action of the internal thread of the positioning screw hole 462. At this time, the compression spring 480 is compressed, and the positioning block 460 is positioned under the opposing double force of the positioning screw 470 and the compression spring 480.

[0114] According to the design requirements of this test system, actuator 500 needs to implement slow strain rate tensile testing and cyclic loading functions. Besides the maximum load, the main technical parameters to consider in slow strain rate tensile testing include tensile strain rate. Referring to commonly used slow strain rate tensile testing machines, the tensile rate of this test system is designed to be 10... -3 S -1 ~10 -7S -1 In addition to peak load, the main technical parameters to be considered in cyclic loading tests include loading frequency and displacement amplitude. Theoretically, the lower the loading frequency, the more significant the corrosion effect. However, excessively low loading frequencies lead to excessively long test times and high test costs. Table 7 shows the relationship between cyclic loading frequency and test duration. Referring to the commonly used loading frequencies for corrosion fatigue tests, the loading frequency designed for this test system is 0.1–5 Hz. The displacement amplitude during cyclic loading is related to the specimen length and the loading stress amplitude. Table 8 shows the correlation data between displacement amplitude and loading stress amplitude when the parallel section length of the specimen is 150 mm (assuming that the deformation is concentrated in the parallel section of the specimen). Based on the current and foreseeable research on marine engineering materials, the loading stress amplitude will not exceed 1000 MPa. Under this condition, the displacement amplitude will not be greater than 0.714 mm. Considering a certain experimental margin, the maximum displacement amplitude under cyclic loading is designed to be no less than 0.75 mm.

[0115] Table 7 Correlation between Cyclic Loading Frequency and Test Duration

[0116]

[0117] Table 8. Correlation between displacement amplitude and applied stress amplitude

[0118] Stress amplitude, MPa 100 200 300 400 500 600 700 800 900 1000 Displacement amplitude, mm 0.071 0.143 0.214 0286 0.357 0.429 0.500 0.571 0.643 0.714

[0119] There will inevitably be mutual interference between different actuators 500 installed on the same loading bracket 300. The main measures adopted in this test system are as follows: to improve the stiffness of the loading bracket 300 as much as possible. The design data of the aforementioned loading bracket 300 shows that the loading bracket 300 designed under the current controllable manufacturing technology difficulty and acceptable manufacturing cost conditions has a high structural stiffness, which can effectively eliminate the mutual interference between different actuators 500.

[0120] Currently, the actuator 500 used in dedicated slow strain rate tensile corrosion testing machines is a servo-controlled electric cylinder. For fatigue testing machines, the actuator 500 can be either a servo-controlled hydraulic cylinder or a servo-controlled electric cylinder. Within the design range of the technical parameters of this testing system, the servo-controlled electric cylinder offers better cost-effectiveness than the servo-controlled hydraulic cylinder. Furthermore, the servo-controlled electric cylinder can handle both slow strain rate tensile corrosion testing and corrosion fatigue testing. Therefore, the servo-controlled electric cylinder is the preferred choice for the actuator 500 in this testing system. The technical parameter requirements for the servo-controlled electric cylinder are determined based on the above-mentioned design values ​​of the testing system's technical parameters (as shown in Table 9).

[0121] Table 9 Technical Parameter Requirements for Servo Control Electric Cylinders

[0122] Serial Number Technology Name Technical Requirements 1 Load control type Constant load, slow strain rate tensile load, alternating cyclic load 2 Overall dimensions Height < 1185mm; Cross-section length < 300mm; Cross-section width < 300mm 3 Maximum travel ≥100mm 4 Maximum displacement amplitude ≥0.75mm 5 Maximum static test force ≥50kN 6 Maximum dynamic test force ≥±50kN 7 Test force measurement range 1-100%FS 8 Static measurement accuracy ≤ ±0.5% of the indicated value 9 Dynamic measurement accuracy ≤ ±2% of the indicated value 10 Loading frequency 0.1-5HZ 11 Actuator continuous working time ≥360 hours

[0123] The environmental chamber 100, as a container for the test medium, needs to provide sealing, insulation, and circulation. The environmental chamber 100 is mounted on a base 320, and all uprights are connected to the base 320 with screws for easy assembly and disassembly. The environmental chamber 100 is divided into four independent chambers by partitions (connected to the base 320 or the bottom plate of the environmental chamber 100 with screws) to create a stable environmental medium flow field. Each chamber has inlet and outlet pipes for liquid and gas media. The top cover assembly 120 is designed as a strip-shaped movable plate with a sample loading hole. During the test, the top cover assembly 120 is installed after the sample 200 is installed and sealed. The uprights and top cover assembly 120 of the environmental chamber 100 can also be a composite structure with an inner layer of corrosion-resistant steel plate and an outer layer of insulation material. To ensure corrosion protection and sealing, a corrosion-resistant rubber pad 325 is laid on the bottom plate of the environmental chamber, and a corrosion-resistant rubber sleeve (such as...) is installed on the clamp assembly 400. Figure 19 As shown, the anti-corrosion rubber sleeve includes an upper sealing sleeve 220 and a lower sealing sleeve 230. The inner layer of the environmental chamber's upright plate undergoes relevant anti-corrosion treatment; the entire interior of the environmental chamber 100 is properly sealed. The volume of the environmental chamber 100 is approximately 0.58 m³. 3 .

[0124] The aforementioned environmental chamber 100 can only support tests on liquid media at low flow rates. When the liquid media flow rate is high, the anti-corrosion rubber sleeve will not be able to withstand the high pressure brought by the high-flow-rate liquid media. Therefore, when conducting high-flow-rate liquid media tests, a high-speed spray assembly 130 needs to be installed, along with a corresponding flow rate control device, to directly spray the sample 200 outside the anti-corrosion rubber sleeve at high speed (e.g., Figure 20 (As shown).

[0125] The liquid medium control device 600 mainly functions to adjust the temperature, salinity, oxygen content, and volume of the liquid medium in the environmental chamber 100 in real time, as well as to circulate the liquid. Its various technical parameters must meet the requirements shown in Table 2. Figure 21The diagram shows a split-type configuration of the liquid medium control device 600: The liquid medium control device 600 comprises three parts: a lower housing 620, an upper housing 610, and a first housing cover (not shown in the attached diagram). The lower housing 620 is connected to the environmental housing 100, and at least two heat exchangers 621 are installed inside. At least two injection pumps are connected externally. The injection pumps inject liquid into the liquid tank through injection holes 622 on the side wall of the liquid tank (including the upper housing 610 and / or the lower housing 620). The side wall of the liquid tank has a reflux hole 623, a drain hole 630, and an oxygen injection hole 624. The reflux hole 623 is used for the reflux of the liquid medium in the environmental housing 100, the drain hole 630 is used to discharge the liquid in the liquid tank, and the oxygen injection hole 624 is used to inject oxygen or air into the liquid tank. At least two sets of parameter sensors 660 (including salinity, temperature, and oxygen content) are installed inside the liquid tank to detect the environmental parameters inside the liquid tank. The upper chamber 610 primarily regulates the salinity of the liquid medium within the lower chamber 620. Internally, it is divided into two sub-chambers: a high-concentration saline tank 680, connected to the lower chamber 620 by a saline solenoid valve 640 to control the amount of high-concentration saline injected into the lower chamber 620; and a freshwater tank, connected to the lower chamber 620 by a freshwater solenoid valve 650 to control the amount of freshwater injected into the lower chamber 620. Each sub-chamber is equipped with at least two level sensors 670 to detect the liquid level within the tank. The volume of the lower chamber 620 is 3 to 5 times that of the environmental chamber 100.

[0126] The gas medium control device 700 mainly functions as a real-time regulator of temperature and humidity and a circulating gas source. Its technical parameters must meet the requirements shown in Table 2. For example... Figure 22 As shown, the gas medium control device 700 includes a gas tank 710, two or more temperature control devices 714 (such as an air conditioning system), two or more oxygen filling devices, two or more humidification devices, a gas medium circulation loop connected to the environmental chamber 100, and two or more temperature sensors 717, humidity sensors 718, and oxygen content sensors 719. At least one ventilation inlet 715 and ventilation outlet 716 are provided on the side. The oxygen filling devices are connected to the gas injection port 711 located on the side wall, the humidification devices are connected to the humidification holes 713 located on the side wall, and the circulation loop is connected to the gas return port 712 located on the side wall. The volume of the gas tank 710 is 3 to 5 times the volume of the environmental chamber 100.

[0127] It should be noted that all directional and positional terms used in this utility model, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "tail end," "head end," and "center," are only used to explain the relative positional relationship and connection between components in a specific state. They are merely for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where both A and B are satisfied simultaneously.

[0128] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0129] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. An environmental chamber for corrosion testing of marine engineering materials, characterized in that, The chamber includes a housing (110) and a cover assembly (120), the cover assembly (120) being disposed on the upper part of the housing (110). The housing (110) and the cover assembly (120) are sealed together to form a chamber required for corrosion testing. A corrosive medium test environment is formed in the chamber. At least two samples (200) can be placed in the chamber. The environmental chamber (100) also includes a high-speed spray assembly (130), which is disposed corresponding to the sample (200) and is used to spray a high-speed test medium onto the surface of the sample (200). The test medium includes a liquid medium and / or a gaseous medium.

2. The environmental chamber for corrosion testing of marine engineering materials as described in claim 1, characterized in that, The high-speed jet assembly (130) includes a high-pressure mass inlet pipeline (131), a high-pressure medium pipeline (132), and a high-speed medium nozzle (133). The first end of the high-pressure mass inlet pipeline (131) is connected to a medium source outside the environmental chamber (100), and the second end is connected to the high-pressure medium pipeline (132). It is used to transport the test medium provided by the medium source to the high-pressure medium pipeline (132). The high-pressure medium pipeline (132) is arranged in the chamber. The high-speed medium nozzle (133) is connected to the high-pressure medium pipeline (132), and the high-speed medium nozzle (133) is correspondingly set to the sample (200). It is used to spray the high-pressure test medium at high speed onto the sample (200).

3. The environmental chamber for corrosion testing of marine engineering materials as described in claim 2, characterized in that, Each sample (200) is provided with one or more high-speed media nozzles (133).

4. The environmental chamber for corrosion testing of marine engineering materials as described in claim 3, characterized in that, When the sample (200) is provided with two or more high-speed media nozzles (133), the high-speed media nozzles (133) are evenly distributed circumferentially around the radial direction of the sample (200).

5. The environmental chamber for corrosion testing of marine engineering materials as described in claim 1, characterized in that, One or more lower clamping through holes (111) are provided on the bottom plate of the housing (110), and one or more upper clamping through holes (124) are provided on the upper cover assembly (120). The lower clamping through holes (111) and the upper clamping through holes (124) are provided in a one-to-one correspondence. The sample (200) and / or clamping assembly (400) are placed between any pair of corresponding lower clamping through holes (111) and upper clamping through holes (124).

6. The environmental chamber for corrosion testing of marine engineering materials as described in claim 5, characterized in that, An upper sealing sleeve (220) is provided near the upper end of the sample (200). The first end of the upper sealing sleeve (220) is sealed on the outer periphery of the sample (200). The second end of the upper sealing sleeve (220) is provided with a skirt extending outward in the circumferential direction. The skirt is used to cooperate and seal with the upper surface of the upper cover assembly (120). A lower sealing sleeve (230) is provided near the lower end of the sample (200). A flange (112) is provided circumferentially around the lower clamp through hole (111) on the upper surface of the base plate. The first end of the lower sealing sleeve (230) is sealed on the sample (200), and the second end of the lower sealing sleeve (230) is sealed on the flange (112).

7. The environmental chamber for corrosion testing of marine engineering materials as described in claim 6, characterized in that, The upper sealing sleeve (220) and the lower sealing sleeve (230) are made of a material that is inert to the test environment and has a certain degree of elasticity.

8. The environmental chamber for corrosion testing of marine engineering materials as described in claim 5, characterized in that, The upper cover assembly (120) includes an end cover plate (121) and a middle cover assembly. There are two end cover plates (121), which are respectively disposed at both ends of the upper cover assembly (120). There is one or more middle cover assemblies, which are disposed between the two end cover plates (121). The middle cover assembly includes an upper middle cover plate (122) and a lower middle cover plate (123). The upper middle cover plate (122) and the lower middle cover plate (123) are fitted together by a ramp (125) to form the middle cover assembly. The upper clamp is disposed between the end cover plate (121) and the upper middle cover plate (122) through a hole (124), and / or, the upper clamp is disposed between the end cover plate (121) and the lower middle cover plate (123), and / or, the upper clamp is disposed between the upper middle cover plate (122) and the lower middle cover plate (123).

9. The environmental chamber for corrosion testing of marine engineering materials as described in claim 8, characterized in that, The inclination angle of the inclined plane (125) is between 45° and 75°.

10. The environmental chamber for corrosion testing of marine engineering materials as described in claim 1, characterized in that, Both the housing (110) and the top cover assembly (120) are sandwich structures. The surfaces that come into contact with the test environment are made of materials that are inert to the test environment conditions, while the core is made of heat-insulating material.

11. The environmental chamber for corrosion testing of marine engineering materials as described in claim 1, characterized in that, The high-speed jet assembly (130) is made of a material that is inert to the test environment conditions.

12. The environmental chamber for corrosion testing of marine engineering materials as described in claim 1, characterized in that, One or more liquid inlet pipes (140) and at least one liquid outlet pipe (150) are provided at the lower part of the side wall of the housing (110). The liquid inlet pipes (140) are used to deliver liquid media for corrosion testing into the chamber, and the liquid outlet pipes (150) are used to discharge the liquid media from the chamber.

13. The environmental chamber for corrosion testing of marine engineering materials as described in any one of claims 1-12, characterized in that, One or more air inlet pipes (160) and at least one air outlet pipe (170) are provided on the upper part of the side wall of the housing (110). The air inlet pipes (160) are used to deliver the gas medium for corrosion testing into the chamber, and the air outlet pipes (170) are used to discharge the gas medium in the chamber.

14. A corrosion testing system for marine engineering materials, characterized in that, Including an environmental chamber for corrosion testing of marine engineering materials as described in any one of claims 1-13.

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