A high temperature salt spray corrosion test method and apparatus

Abstract

This invention discloses a method and apparatus for high-temperature salt spray testing in a simulated marine environment, belonging to the field of material corrosion testing technology. The apparatus includes an atmosphere control system, a microporous atomizing device, a sealed container, and a tube furnace. A perforated acrylic sheet is fixed to the bottom of the sealed container. A cotton swab is inserted into the perforated acrylic sheet, and the atomizing plate is mounted on the cotton swab using a plastic fixing kit, ensuring full contact with the swab. The power supply line for the atomizing plate is led out through an opening in the container and then sealed. An air inlet is located on the lid of the sealed container, and an air outlet is located on the side of the container. The air outlet is connected to the quartz tube of the tube furnace via a PTFE gas pipe. This invention regulates the amount of mist produced inside the container by controlling the atomizing plate and uses a gas flow meter to control the flow rate of gas entering through the inlet, thereby regulating the speed at which salt mist is output from the outlet. The solution particles generated by the atomizing plate are 2-8 μm in size. After being fully mixed with gas in the upper space of the container, they are introduced into the tube furnace. The amount of salt deposited per hour during the high-temperature salt spray test can be adjusted as needed. The device can maintain a stable temperature above 1000 ℃, and has both controllable adjustment capabilities and the ability to operate for extended periods.

Description

Technical Field

[0001] This invention relates to the field of material corrosion testing technology, specifically to a high-temperature salt spray test method and apparatus that simulates a marine environment. Background Technology

[0002] Before being put into production and use, metallic materials typically need to undergo various performance tests, especially components used in special environments. For example, aircraft engines operating in near-ocean environments face higher requirements for corrosion resistance due to the high humidity and salt spray characteristics of the near-ocean atmosphere.

[0003] A common method for testing the corrosion resistance of materials is the salt spray test. Salt spray test chambers can provide salt spray concentrations tens of times higher than those in the natural environment, thus quickly determining the corrosion resistance of metallic materials. However, current salt spray testing equipment can only simulate the salt spray corrosion environment at conventional, relatively low temperatures, and cannot simulate the operating conditions of an engine during high-temperature operation.

[0004] Since high temperatures significantly accelerate the corrosion of materials, there is an urgent need for a device capable of conducting salt spray corrosion tests in high-temperature environments to meet the corrosion resistance assessment requirements of high-temperature service components such as aero engines. Summary of the Invention

[0005] In order to overcome the shortcomings of existing salt spray test devices that cannot operate under high temperature conditions, this invention provides a test device that can simulate the high temperature salt spray corrosion conditions of the marine environment.

[0006] The present invention provides a high-temperature salt spray corrosion test device for simulating a marine environment, comprising an atmosphere control system, a microporous atomizing device, a sealed container, and a tubular furnace.

[0007] The atmosphere control system includes gas cylinders and gas flow meters required for the experiment. The gas cylinders are connected to the gas flow meters via hoses, and the gas flow meters are connected to the inlet of the sealed tank via hoses. The flow rate of the gas finally introduced into the tube furnace is controlled by controlling the gas flow meters.

[0008] The microporous atomizing device is placed inside a sealed container. The cotton swab is fixed in position by inserting it into a perforated acrylic sheet fixed to the bottom of the container. A plastic fixing kit is used to attach the atomizing sheet to the cotton swab. The power supply wire of the atomizing sheet is connected to an external drive circuit board through an outlet on the container body, and the outlet is sealed with silicone.

[0009] The sealed container is made of plexiglass, with a removable lid at the top. The lid has an air inlet connected to a gas flow meter via a flexible hose. The container body has an air outlet connected to the sealing flange of the quartz tube in the tube furnace via a flexible hose. The container contains a NaCl salt solution, with the solution level halfway up the cotton swab. During operation, an atomizing plate sprays the salt solution absorbed by the cotton swab to form a salt mist. This salt mist mixes thoroughly with the incoming gas above the container before being introduced into the quartz tube of the tube furnace through a gas pipe.

[0010] The tube furnace is a horizontal tube furnace that uses a high-temperature resistant quartz tube. One end of the quartz tube is connected to the outlet of the sealed container, and the other end is connected to the outside atmosphere through a flange, without being sealed. The experimental temperature is observed and adjusted through the temperature control and display system of the tube furnace.

[0011] The temperature control and display system uses thermocouples integrated into the tube furnace as sensors. Before the experiment, the actual temperature inside the quartz tube is detected using thermocouples, and then the set temperature of the tube furnace is adjusted to bring the quartz tube to the preset experimental temperature.

[0012] The atomizing plate consists of a piezoelectric ceramic ring and a metal steel sheet. By outputting a signal through a drive circuit board, the piezoelectric ceramic ring vibrates at a high frequency, causing the metal steel sheet to vibrate. This causes the salt solution to be ejected from thousands of micropores on the metal steel sheet, forming atomized particles ranging from several micrometers to tens of micrometers, thus achieving the atomization of the liquid salt solution.

[0013] The working process of this invention is as follows: A sufficient amount of NaCl salt solution is added to a sealed container, and the inlet and outlet pipes are connected to ensure the system is sealed. The sample is placed in a high-temperature resistant quartz crucible, which is positioned in the middle of the quartz tube of the tube furnace. The gas cylinder is opened to allow gas to enter the sealed container through the gas flow controller, and then continuously introduced into the quartz tube of the tube furnace for a period of time through the outlet, pre-conditioning the sample with the required experimental atmosphere. The tube furnace temperature control and display system is turned on, and the temperature inside the tube furnace is adjusted to the experimental temperature. After the system stabilizes, the salt spray control chip is activated to begin generating salt spray. The salt spray mixes thoroughly with the experimental gas and then enters the quartz tube through the outlet, initiating the high-temperature salt spray corrosion test.

[0014] The working principle of this invention is as follows: using the gas required for the experiment as a carrier, the atomizing plate atomizes the NaCl salt solution into tiny particles ranging from several micrometers to tens of micrometers. The gas carries these tiny particles into the quartz tube of the tube furnace, placing the sample in a high humidity and high salinity environment, simulating the high temperature service environment in the marine atmosphere, causing the sample to corrode.

[0015] (1) The marine high temperature salt spray test device simulated by the present invention can reach a high temperature, which can reach more than 1000℃, and the temperature is uniform and stable. (2) The salt spray content carried in the gas can be precisely controlled by the gas flow meter and the atomizing plate driver chip. The generated salt spray particles are small and can better simulate the marine atmospheric environment. (3) The operation is simple, the salt solution consumption is low, and a small amount of salt spray solution can support a long experimental time without the need to add solution in the middle; (4) The sealed tank lid can collect settled brine, further reducing brine consumption; (5) The apparatus is easy to install, the experiment is highly repeatable, and experimental influencing factors such as gas flow rate and salt spray content can be accurately controlled. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the marine high-temperature salt spray corrosion test device of the present invention.

[0017] The markings in the diagram are as follows: 1—Gas cylinder required for the experiment; 2—Gas flow meter; 3—Sealed container; 4—Microporous atomizing plate; 5—Plastic fixing kit; 6—Cotton swab; 7—Atomizing plate driver chip; 8—Tube furnace; 9—Quartz tube; 10—Sample; 11—Solid-supported quartz plate; 12—Temperature control and display system. Specific implementation methods The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Example

[0018] like Figure 1 As shown in the figure, this embodiment provides a high-temperature salt spray corrosion test device for simulating a marine environment, including an atmosphere control system, a microporous atomizing device, a sealed tank, and a tube furnace.

[0019] Atmosphere control system: The gas cylinder (1) required for the experiment is connected to the gas flow meter (2) through a hose, and the gas flow meter (2) is then connected to the inlet of the sealed container (3) through a hose. The gas flow rate that is finally introduced into the tube furnace (8) is controlled by controlling the gas flow meter (2).

[0020] Microporous atomizing device: The microporous atomizing plate (4) is placed inside the sealed canister (3). The cotton swab (6) is fixed in position by inserting it into a perforated plexiglass sheet fixed to the bottom of the canister. The microporous atomizing plate (4) and the cotton swab (6) are attached together using a plastic fixing kit (5). The power supply wire of the microporous atomizing plate (4) is connected to the external atomizing plate driver chip (7) through the wire outlet on the canister. The wire outlet is sealed with silicone.

[0021] Sealed container: The sealed container (3) is made of plexiglass, with a removable sealing cap on the top. The sealing cap has an air inlet, which is connected to the gas flow meter (2) via a hose. The side wall of the container has an air outlet, which is connected to the sealing flange of the quartz tube (9) in the tube furnace (8) via a hose. The container is filled with NaCl salt solution, and the liquid level of the salt solution is half the height of the cotton swab (6). During operation, the microporous atomizing plate (4) sprays the salt solution absorbed by the cotton swab (6) to form a salt mist. The salt mist is fully mixed with the incoming gas in the space above the container and then introduced into the quartz tube (9) of the tube furnace (8) through the gas pipe.

[0022] Tube furnace: The tube furnace (8) is a horizontal tube furnace, which uses a high-temperature resistant quartz tube (9) inside. One end of the quartz tube (9) is connected to the outlet hose of the sealed container (3) through a sealing flange, and the other end is connected to the outside atmosphere through a flange. The sample (10) is placed on the sample-carrying quartz plate (11) in the center of the quartz tube (9). The experimental temperature is observed and adjusted through the temperature control and display system (12) equipped with the tube furnace (8).

[0023] The temperature sensor of the temperature control and display system (12) is a thermocouple that comes with the tube furnace (8). Before the experiment, the actual temperature inside the quartz tube (9) is detected by the thermocouple, and then the set temperature of the tube furnace (8) is adjusted so that the quartz tube (9) reaches the preset experimental temperature.

[0024] The microporous atomizing plate (4) is composed of a piezoelectric ceramic ring and a metal steel sheet. The atomizing plate driver chip (7) outputs a signal through its drive circuit board to cause the piezoelectric ceramic to vibrate at a high frequency, which in turn causes the metal steel sheet to vibrate, spraying the salt solution out from thousands of micropores on the metal steel sheet to form atomized particles ranging from several micrometers to tens of micrometers.

[0025] The experimental procedure is as follows: Add sufficient NaCl salt solution to the sealed container (3), connect the inlet and outlet pipes, and ensure that the system is sealed. Place the sample (10) in a high-temperature resistant quartz crucible, which is placed in the middle of the quartz tube (9) of the tube furnace (8). Open the gas cylinder (1) and let the gas enter the sealed container (3) through the gas flow meter (2), and then continuously pass it into the quartz tube (9) of the tube furnace (8) for a period of time through the outlet, so that the sample (10) is in the atmosphere required for the experiment. Turn on the temperature control and display system (12) of the tube furnace (8) and adjust the temperature inside the tube furnace to the experimental temperature. After the system is stable, turn on the atomizing chip (7), and the microporous atomizing chip (4) begins to generate salt spray. After the salt spray and the experimental gas are fully mixed in the upper space of the sealed container (3), they enter the quartz tube (9) through the outlet to start the high-temperature salt spray corrosion test.

[0026] The gas flow rate can be changed by adjusting the gas flow meter (2), thereby adjusting the amount of salt spray introduced into the tube furnace (8). Through pre-testing, the correspondence between the salt content deposited per unit area in the tube furnace (8) and the gas flow rate and the working parameters of the atomizing plate can be obtained. In actual experiments, a stable salt spray flow and a stable amount of salt spray can be obtained.

Claims

1. A method and apparatus for simulating a marine environment using high-temperature salt spray testing, characterized in that: It includes an atmosphere control system, a microporous atomizing device, a sealed container, and a tube furnace.

2. The apparatus according to claim 1, characterized in that: The atmosphere control system includes a gas cylinder (1) and a gas flow meter (2). The gas cylinder (1) is connected to the gas flow meter (2) via a hose, and the gas flow meter (2) is connected to the air inlet on the sealed tank (3) via a hose.

3. The apparatus according to claim 1, characterized in that: The microporous atomizing device includes a microporous atomizing plate (4), a plastic fixing kit (5), and a cotton swab (6). The cotton swab (6) is inserted into a perforated organic glass sheet fixed at the bottom of the sealed can (3). The plastic fixing kit (5) fixes the microporous atomizing plate (4) and fits it against the cotton swab (6). The power supply line of the microporous atomizing plate (4) is connected to an external atomizing plate driver chip (7) through the outlet on the can body. The outlet is sealed with silicone.

4. The apparatus according to claim 1, characterized in that: The sealed container (3) is made of plexiglass and has a removable sealing cap on the top. The sealing cap has an air inlet and the side wall of the container has an air outlet. The sealed container (3) contains a NaCl salt solution, and the salt solution level is half the height of the cotton swab (6).

5. The apparatus according to claim 1, characterized in that: The tube furnace (8) is a horizontal tube furnace with a high-temperature resistant quartz tube (9) inside. One end of the quartz tube (9) is connected to the outlet hose of the sealed tank (3) through a sealing flange, and the other end is connected to the outside atmosphere through a flange. A sample quartz plate (11) is placed in the center of the quartz tube (9), and the sample (10) is placed on the sample quartz plate (11). The tube furnace (8) is equipped with a temperature control and display system (12).

6. The apparatus according to claim 1, characterized in that: The microporous atomizing plate (4) is composed of a piezoelectric ceramic ring and a metal steel sheet. The piezoelectric ceramic ring is driven by the output of the drive circuit board to generate high-frequency vibration, which drives the metal steel sheet to vibrate and spray the salt solution from the micropores on the metal steel sheet to form atomized particles of 2-8 μm.

7. The apparatus according to claim 1, characterized in that: The removable sealing cap of the sealed tank (3) can collect the settled brine to reduce the consumption of brine in the tank.

8. The apparatus according to claim 1, characterized in that: The atmosphere control system uses gas pressure as power and controls the gas flow rate entering the sealed tank (3) by adjusting the gas flow meter (2), thereby adjusting the amount of salt spray introduced into the tube furnace (8) to achieve quantitative control of the amount of salt deposited per unit area in the quartz tube (9).

9. The apparatus according to claim 1, characterized in that: The temperature sensor of the temperature control and display system (12) is a thermocouple that comes with the tube furnace (8). Before the experiment, the actual temperature inside the quartz tube (9) is detected by the thermocouple, and then the set temperature of the tube furnace (8) is adjusted so that the quartz tube (9) reaches the preset experimental temperature.

10. The apparatus according to claim 1, characterized in that: The working temperature of the tubular furnace (8) can reach over 1000 ℃.

11. The apparatus according to claim 1, characterized in that: The air outlet is directly connected to the quartz tube (9) via a PTFE air pipe.

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