Low-temperature salt spray corrosion system

Abstract

A low-temperature salt spray corrosion system belongs to the technical field of polar environment salt spray tests and can be used for low-temperature salt spray environment corrosion tests of equipment and materials. The corrosion system comprises a low-temperature environment box, a salt spray test box, an electric heating system, salt spray spraying equipment, a water tank and an air pump. The anti-freezing liquid pipeline system has heat preservation and heating functions and is matched with the gas path system to complete conveying of a salt solution in a low-temperature environment; 2) a nozzle system with heat preservation and electric heating functions and adjustable particle size ensures low-temperature spraying of mist salt mist liquid drops; (3) an anti-freezing drainage system with a heating function ensures low-temperature drainage of deposition liquid in the box body; and 4) an electric heating function anti-freezing observation window system ensures the observation function of the box body at low temperature. Through the targeted low-temperature anti-freezing design, the low-temperature corrosion capability verification of the equipment material is realized, and the low-temperature freezing problem of the conventional salt mist box is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of polar environment salt spray testing and relates to a low-temperature-salt spray multi-condition composite salt spray corrosion chamber. Background Art

[0002] Polar resource development is an important strategic direction for our country. Polar development is inseparable from cold region equipment. Equipment that has been operating in such cold regions with low temperature, strong wind and high salt fog for a long time will inevitably be damaged by salt fog corrosion. Salt fog corrosion on the surface of metal materials is caused by the electrochemical reaction between chloride ions penetrating the oxide layer and protective layer on the metal surface and the internal metal.

[0003] The salt spray corrosion test chamber is an environmental testing equipment that uses artificially created salt spray environment to conduct salt spray corrosion on samples to test the corrosion resistance of samples or equipment. In a natural exposure environment, it takes months or even years for samples or equipment to clearly observe the corrosion effect, but in an artificial simulated salt spray environment, the same effect can be achieved in just a few hours or days.

[0004] At present, most salt spray corrosion chambers cannot be used for the study of salt spray corrosion at low temperatures. Low temperatures will cause the pipes of the salt spray corrosion chamber to freeze, the nozzles to be blocked, and the ice in the chamber to be blocked. In view of the above situations, it is necessary to develop a low-temperature salt spray corrosion device specially designed for low temperatures. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a salt spray corrosion system for low temperature environment. It is an antifreeze drainage system with heating function, an antifreeze liquid pipeline system with heat preservation and heating function, a nozzle system with heat preservation and electric heating function and adjustable particle size, an antifreeze observation window system with electric heating function and a transparent test box. The whole equipment is placed in a low temperature environment test box with a monitoring system to achieve the main purpose of the present invention, that is, to verify the salt spray durability of equipment materials at low temperature, and at the same time, to analyze the corrosion influence of salt spray on equipment materials at different low temperatures.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A low-temperature salt spray corrosion test system can be used to verify the low-temperature salt spray resistance of equipment and materials used in polar facilities, that is, to test the low-temperature salt spray environment corrosion of equipment and materials. The test system includes a low-temperature environment box 18, a salt spray corrosion box 1 in the low-temperature environment box 18, an anti-freezing liquid pipeline system, an anti-freezing drainage system, an air system, a nozzle system, a water tank 17 and an air pump 14 outside the low-temperature environment box 18, and an anti-freezing observation window system. The specific design is as follows:

[0008] 1) An antifreeze liquid pipeline system with heat preservation and heating functions cooperates with the gas system to complete the transportation of salt solution in a low-temperature environment; 2) A nozzle system with heat preservation and electric heating functions and adjustable particle size ensures the low-temperature spraying of atomized salt mist droplets; 3) An antifreeze drainage system with heating function ensures the low-temperature discharge of the sediment in the low-temperature environment box 18; 4) An antifreeze observation window system with electric heating function ensures the observation function of the low-temperature environment box 18 at low temperatures. The present invention realizes the verification of the low-temperature corrosion ability of equipment materials through targeted low-temperature antifreeze design.

[0009] The structural layout of each system of the low temperature salt spray corrosion test system is as follows:

[0010] The low temperature environment box 18 provides the low temperature environment required for the test;

[0011] A transparent salt spray corrosion box 1 is provided inside the low temperature environment box 18. The transparent salt spray test box 1 is provided with a test platform and the main body of the salt spray spray equipment 6. A box cover 2 is provided on the top for taking out and placing the sample. The test platform is a height-adjustable rack 8 provided on the bottom platform of the salt spray corrosion box 1. The sample is placed on the height-adjustable rack 8. The distance from the sample to the salt spray nozzle 5 of the salt spray spray equipment 6 is controlled by the height-adjustable rack 8 to achieve the required salt spray amount for the test. A salt spray collector 3 and a measuring cylinder 4 are provided inside the salt spray corrosion box 1 to analyze the amount of salt spray deposition during the test period.

[0012] The overall structure of the salt spray spray equipment 6 includes a water pipe 10, an air pipe 11, a salt spray nozzle 5 located in the salt spray test box 1, a water tank 17 located outside the salt spray test box 1, and an air pump 14. Specifically: the water tank 17 is sealed as a whole to prevent the evaporation of salt water, and the water tank 17 is connected to the salt spray nozzle 5 in the salt spray corrosion box 1 through the water pipe 11. The air pump 14 is mainly used to provide a power source and pressurization for spraying. The air pump 14 is connected to the air pipe 10, and the air pipe 10 and the water pipe 11 are connected in parallel in the thermal insulation jacket to provide a power source for the salt water, for the transmission of pressurized gas and salt solution, and to change the spraying amount of the salt spray nozzle 5 by adjusting the air pressure of the air pump 14.

[0013] The air pump 14, water pipe 10, air pipe 11, and the heat-insulating outer sheath and electric heating tape wrapped around the water pipe 10 and air pipe 11 constitute an antifreeze liquid pipeline system with heat-insulating and heating functions.

[0014] The salt spray nozzle 5, electric heating belt and thermal insulation sheath constitute a nozzle system with thermal insulation and heating functions, which is connected to the antifreeze liquid pipeline system to realize salt spray spraying, wherein the salt spray nozzle 5 is wound with an electric heating wire 9 and covered with a thermal insulation sheath.

[0015] The bottom surface of the salt spray corrosion box 1 is provided with an anti-freezing drainage system with a heating function, and grooves are formed around it and an electric heating system 19 is added to the bottom of the box to prevent the deposited liquid from accumulating ice and blocking. The drainage port provided on one side of the bottom of the salt spray corrosion box 1 is connected to the drainage pipe 13 for discharging the deposited liquid in the box.

[0016] The side wall of the salt spray corrosion box 1 is provided with a heating function anti-freezing observation window system, which has a self-heating anti-fogging function.

[0017] Furthermore, a pressure balance pipe 12 communicating with the outside is provided on the top of the salt spray corrosion box 1 for exhausting gas to maintain the pressure balance inside and outside the salt spray corrosion box 1 .

[0018] Furthermore, in order to ensure that the brine will not freeze at low temperatures and cause ice accumulation and blockage of the water pipe 11 and the salt spray nozzle 5, a thermal insulation layer 7 is laid outside the water pipe 11 and the salt spray nozzle 5 to isolate the water pipe 11, the salt spray nozzle 5 and the low-temperature environment box 18 to prevent the brine in the water pipe 11 from freezing due to direct contact with low temperature; an electric heating device 9 is attached around the salt spray nozzle 5 to heat the brine in the water pipe to ensure that the salt mist can be sprayed out normally and does not freeze and block. The electric heating tape uses a 24V AC transformer 15 to ensure the safety of personnel operation. Furthermore, a temperature sensor and a humidity sensor are provided in the low-temperature environment box 18, and the temperature sensor and the humidity sensor are both connected to the control panel electrical signal; the low-temperature environment test box 18 creates a low-temperature environment for the salt spray corrosion box 1 inside it, and records the temperature and humidity change data over time.

[0019] Furthermore, the top of the low temperature environment box 18 includes a lighting device.

[0020] Furthermore, the box cover 2 on the top of the transparent salt spray corrosion box 1 is sealed with rubber to ensure that the internal environment of the box is isolated from the outside. Furthermore, the front of the transparent salt spray corrosion box adopts electrically heated glass.

[0021] Furthermore, the electric heating system is wound around the salt spray equipment through a heating wire to provide heat.

[0022] Furthermore, a water level gauge 16 is attached to the water tank 17 of the salt spray equipment 6 to observe the remaining amount of salt water.

[0023] The beneficial effects of the test system provided by the present invention are as follows:

[0024] (1) Equipped with supporting low-temperature environmental parameter monitoring equipment, it can not only observe the corrosion condition of the test sample, but also conduct comprehensive and long-term monitoring of the ambient temperature.

[0025] (2) Strong adaptability. Since the test frame is height-adjustable, the test system can adjust the amount of salt spray according to the sample size to meet the test requirements.

[0026] (3) Wide applicability. Due to the design of the electric heating system, it can also be used for salt spray corrosion in low temperature environments, and solves the problem of salt spray freezing and clogging the spray equipment at low temperatures.

[0027] In summary, the present invention solves the deficiency that the existing salt spray corrosion chamber cannot be used at low temperatures. The low-temperature environment chamber realizes the function of low-temperature salt spray testing through the anti-freezing pipeline with heating function, nozzle, drainage and observation window system design, and the overall structure of the present invention is stable and reliable, and disassembly and assembly are simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a plan view of the low-temperature salt spray chamber.

[0029] Figure 2 This is a top view of the low-temperature salt spray chamber.

[0030] Figure 3 This is the side view of the low temperature salt spray chamber.

[0031] Figure 4 This is the oblique test diagram of the low temperature salt spray chamber.

[0032] Figure 5 Schematic diagram of the drainage system.

[0033] Figure 6 Schematic diagram of electric heated window system.

[0034] Figure 7 Schematic diagram of the liquid piping system.

[0035] Figure 8 Schematic diagram of the nozzle device.

[0036] In the figure: 1 salt spray corrosion box; 2 box cover; 3 salt spray collector; 4 measuring cylinder; 5 salt spray nozzle; 6 salt spray equipment; 7 insulation layer; 8 height-adjustable storage rack; 9 nozzle electric heating; 10 water pipe; 11 air pipe; 12 air pressure balance pipe; 13 drainage pipe; 14 air pump; 1524V AC transformer; 16 water level gauge; 17 water tank; 18 low temperature environment box; 19 box bottom electric heating system. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with the accompanying drawings.

[0038] The low temperature environment box 18 includes a low temperature environment test box 18 body that can record temperature changes. The low temperature environment test box 18 body is used to create a low temperature environment for the internal salt spray corrosion box 1 and record the temperature change data over time. The overall structure of the transparent salt spray corrosion box 1 includes the salt spray corrosion box 1 body, a height-adjustable shelf 8 inside the corrosion box, and a lid 2 for taking the test sample. The salt spray corrosion box 1 body uses transparent materials to facilitate observation of the corrosion and ice conditions of the sample. The height of the shelf 8 can be reasonably adjusted according to the size of the sample, and the distance from the sample to the salt spray nozzle can be controlled to achieve the required salt spray amount for the test. The lid 2 is sealed with rubber around to ensure that the internal environment of the box is isolated from the outside world. The overall structure of the salt spray spray equipment 6 includes a water pipe 10, an air pipe 11, an insulation layer 7, a salt spray nozzle 5, a nozzle electric heating 9, a water tank 17, an air pump 14, and a 24V AC transformer 15 for electric heating. A water level gauge 16 is attached to the water tank to observe the remaining amount of brine. The water tank is sealed as a whole to prevent the evaporation of brine. The water tank is connected to the salt spray nozzle 5 through the water pipe 11. The air pump 14 is mainly used to provide a power source and boost pressure for spraying. The air pump 14 is connected to the air pipe 10, and the air pipe 10 and the water pipe 11 are connected in parallel in the thermal insulation jacket to provide a power source for the brine. By adjusting the air pressure of the air pump, the amount of salt spray spray can be changed. In order to ensure that the brine will not freeze due to low temperature at low temperature, causing ice accumulation and blockage of the water pipe 11 and the salt spray nozzle 5, a layer of insulation layer 6 is laid on the outside of the water pipe 11 and the salt spray nozzle 5 to isolate the water pipe 11, the nozzle 5 and the low temperature environment box 18 to prevent the brine in the water pipe from freezing due to direct contact with low temperature; an electric heating device 9 is attached around the nozzle to heat the brine in the water pipe to ensure that the salt mist can be sprayed normally and no ice blockage occurs. The salt spray collector 3 and the measuring cylinder 4 are placed in the salt spray test box 1 to analyze the amount of salt spray deposition during the test period.

[0039] In this embodiment, the air pressure balance pipe 12 is used to maintain the air pressure balance inside and outside the salt spray box. Since the salt spray spray equipment is powered by the air pump 14 and pressurized, this will inevitably cause gas to enter the salt spray corrosion box 1, causing the air pressure inside the salt spray corrosion box 1 to increase. Therefore, an exhaust pipe 12 is installed inside the salt spray corrosion box 1 to connect to the outside, and the exhaust gas maintains the air pressure balance inside and outside the salt spray corrosion box 1.

[0040] In this embodiment, since the test is carried out in a low temperature environment, the salt mist sprayed by the salt spray nozzle 5 will produce ice and frost in this environment and adhere to the bottom of the box. Therefore, an electric heating device is arranged at the groove at the bottom of the box, and a drainage groove (salt spray box drainage pipe 13) is designed on the side of the box to drain the melted salt water out of the box. For specific layout, see Figure 2 , Figure 5 .

[0041] In this embodiment, the above-mentioned salt spray corrosion box uses transparent materials to facilitate observation of sample corrosion. However, in an actual low-temperature environment, fog and frost may adhere to the inner wall of the salt spray box, thereby affecting observation. Figure 6 The front-view observation window shown uses electrically heated glass to increase the temperature of the glass surface, evaporate the mist, and melt the ice layer, thereby avoiding the formation of fog and ice layers and facilitating observation during the test.

[0042] In this embodiment, the antifreeze liquid pipeline system with heat preservation and heating functions is Figure 7 The figure shows a schematic diagram of the piping system, which is implemented by wrapping a circle of electric heating wire around the outer wall of the water pipe, and adding a layer of rubber-plastic insulation pipe 7 outside the electric heating wire 9, water pipe 11 and air pipe 10 to prevent the brine transported by the water pipe from freezing due to the low temperature environment.

[0043] In this embodiment, the nozzle system with heat preservation electric heating function and adjustable particle size, Figure 8 The figure shows a schematic diagram of the piping system, which is implemented by wrapping the salt mist nozzle 5 with an electric heating wire 9 to prevent the salt water from freezing at the nozzle 5 due to the low temperature environment, thereby affecting the discharge of the salt mist. At the same time, the nozzle is designed to be replaceable, so that the nozzle can be replaced at any time and the size of the salt mist particles can be adjusted.

[0044] The above-described embodiments merely express the implementation methods of the present invention, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A low temperature salt spray corrosion system, characterized in that: The low temperature salt spray corrosion system includes the following equipment: An anti-freezing drainage system with a heating function ensures low-temperature discharge of the sediment liquid in the low-temperature environment test chamber (18); The anti-freezing liquid pipeline system with heat preservation and heating functions cooperates with the gas system to complete the transportation of salt solution in low temperature environment; The nozzle system with heat preservation electric heating function and adjustable particle size ensures low-temperature spraying of mist salt droplets; An anti-freezing observation window system with electric heating function ensures the observation function of the low temperature environment test chamber (18) at low temperatures; Transparent test box; Each device is placed in a low-temperature environment test chamber with a monitoring system to conduct low-temperature salt spray environment corrosion tests on the equipment materials. At the same time, the influence of salt spray on the corrosion of equipment materials at different low temperatures can be analyzed.

2. A low temperature salt spray corrosion test system according to claim 1, characterized in that: The test system comprises a low temperature environment test box (18), a salt spray corrosion box (1) in the low temperature environment test box (18), an antifreeze liquid pipeline system, an antifreeze drainage system, an air system, a nozzle system, a water tank (17) and an air pump (14) outside the low temperature environment test box (18), and an antifreeze observation window system, specifically: The low temperature environment test box (18) is provided with a transparent salt spray corrosion box (1) inside, and a test platform and the main body of the salt spray spray equipment (6) are arranged inside the salt spray test box (1), and a box cover (2) is provided on the top for taking out and placing the sample; the test platform is a bottom platform of the salt spray corrosion box (1) and a height-adjustable rack (8) is provided, and the distance from the sample to the salt spray nozzle (5) of the salt spray spray equipment (6) is controlled by the height-adjustable rack (8) to achieve the required salt spray amount for the test; the salt spray corrosion box (1) is provided with a salt spray collector (3) and a measuring cylinder (4) for analyzing the amount of salt spray deposition during the test period; The salt spray equipment (6) comprises a water pipe (10), an air pipe (11), a salt spray nozzle (5) located in a salt spray test box (1), a water tank (17) located outside the salt spray test box (1), and an air pump (14); the water tank (17) is connected to the salt spray nozzle (5) in the salt spray corrosion box (1) through the water pipe (10); the air pump (14) is connected to the air pipe (11), and the air pipe (11) and the water pipe (10) are connected in parallel in a heat-insulating jacket, and are used for the transmission of pressurized gas and salt solution, and the spraying amount of the salt spray nozzle (5) is changed by adjusting the air pressure of the air pump (14); The bottom surface of the salt spray corrosion box (1) is provided with an anti-freezing drainage system with a heating function, and grooves are formed around the bottom surface and an electric heating system (19) is added to the bottom of the box; a drainage port is provided on one side of the bottom of the salt spray corrosion box (1) and is connected to a drainage pipe 13 for draining the deposited liquid in the box; The side wall of the salt spray corrosion box (1) is provided with an anti-freezing observation window system with a heating function.

3. A low temperature salt spray corrosion test system according to claim 2, characterized in that: The air pump (14), water pipe (10), air pipe (11), the heat-insulating outer sheath wrapped around the water pipe (10) and the air pipe (11), and the electric heating belt constitute an anti-freezing liquid pipeline system with heat-insulating and heating functions.

4. A low temperature salt spray corrosion test system according to claim 2, characterized in that: The salt mist nozzle (5), electric heating belt and thermal insulation sheath constitute a nozzle system with thermal insulation and heating functions, which is connected to the antifreeze liquid pipeline system to realize salt mist spraying, wherein the salt mist nozzle (5) uses an electric heating wire (9) to wrap around and cover the thermal insulation sheath.

5. A low temperature salt spray corrosion test system according to claim 2, characterized in that: The top of the salt spray corrosion box (1) is provided with an air pressure balance pipe (12) connected to the outside world, which is used to discharge gas to maintain the air pressure balance inside and outside the salt spray corrosion box (1).

6. A low temperature salt spray corrosion test system according to claim 2, characterized in that: The low temperature environment test box (18) is provided with a temperature sensor and a humidity sensor, and both the temperature sensor and the humidity sensor are connected to the control panel electrical signal; the low temperature environment test box (18) creates a low temperature environment for the salt spray corrosion box (1) inside it, and records the temperature and humidity change data over time.

7. A low temperature salt spray corrosion test system according to claim 2, characterized in that: The top of the low temperature environment test box (18) comprises a lighting device.

8. A low temperature salt spray corrosion test system according to claim 2, characterized in that: The box cover (2) on the top of the transparent salt spray corrosion box (1) is sealed with rubber, and the front of the transparent salt spray corrosion box adopts electric heating glass; the water tank (17) is sealed as a whole to prevent the evaporation of salt water; further, the electric heating system is intertwined with the salt spray spray equipment through a heating wire to provide heat.

9. A low temperature salt spray corrosion test system according to claim 2, characterized in that: A water level gauge (16) is attached to the water tank (17) of the salt spray equipment (6) for observing the remaining amount of salt water.

Images