Marine atmosphere and coast environment acceleration simulation verification test device and method

Abstract

The invention discloses a marine atmosphere and coast environment acceleration simulation verification test device and method.The marine atmosphere and coast environment acceleration simulation verification test device comprises a test water tank, a water supply water tank and a control module, seawater is contained in the water supply water tank, and the test water tank comprises an equipment room located on the lower portion and a test room located on the upper portion; a test rack is mounted in the test room, the test room is internally divided into a peripheral infiltration test area positioned at the lower part and a spraying and spraying test area positioned at the upper part, and a spraying mechanism and a spraying mechanism are arranged in the spraying and spraying test area; a magnetic pump is arranged in the equipment chamber, the input end of the magnetic pump is connected with the water supply tank through a pipeline, and the output end of the magnetic pump is connected with the spraying mechanism and the spraying mechanism of the peripheral infiltration test area and the spraying and spraying test area through pipelines. According to the invention, ocean atmosphere and coast environment corrosion conditions can be simulated more truly in different areas such as inland and the like, and the defect that a traditional salt spray test cannot equivalently simulate an ocean atmosphere corrosion environment is overcome.

Description

Technical Field

[0001] This invention relates to the field of equipment testing, and more particularly to an accelerated simulation verification test apparatus and method for marine atmospheric and coastal environments. Background Technology

[0002] The marine atmospheric environment is characterized by "three highs and one strong" (i.e., high temperature, high humidity, high salt spray, and strong solar radiation). It is a highly corrosive environment where various materials are extremely susceptible to corrosion. Sea salt particles released into the atmosphere through seawater splash contain various salts, making the corrosion of metals in the marine atmospheric environment severe, complex, and influenced by multiple factors.

[0003] Atmospheric exposure experiments and indoor accelerated simulation experiments are two very important methods for studying atmospheric corrosion of metals. The former can directly observe the corrosion conditions at the experimental site, and the data is invaluable; however, the experimental cycle is long and highly regional, limiting its widespread application in real-world situations. Indoor accelerated simulation experiments, on the other hand, have a shorter timeframe, providing simulated results more quickly, and the experimental conditions can be strictly controlled on-site. However, currently, due to limitations in various aspects, indoor accelerated simulation experiments can only simulate major atmospheric environmental factors and cannot replicate the real marine atmospheric exposure environment. Summary of the Invention

[0004] The purpose of this invention is to provide a marine atmospheric and coastal environment accelerated simulation verification test device that combines the advantages of atmospheric exposure and indoor accelerated simulation experiments, while taking into account both acceleration and simulation in the test process.

[0005] An accelerated simulation and verification experimental device for marine atmospheric and coastal environments includes an experimental water tank, a water supply tank, and a control module. The device is characterized in that: the water supply tank contains seawater; the experimental water tank includes a lower equipment room and an upper experimental chamber; the experimental chamber is equipped with an experimental rack and is divided into a lower immersion test area and an upper spray test area; the spray test area is equipped with a spraying mechanism and a misting mechanism; the equipment room contains a magnetic pump, the input end of which is connected to the water supply tank via a pipe, and the output end of which is connected to the spraying mechanism and misting mechanism in both the immersion test area and the spray test area via pipes.

[0006] Furthermore, the outer wall of the test frame is a mounting surface for hanging the test specimens. The lower part of the test frame, located in the circumferential immersion test area, is vertically arranged, while the upper part of the test frame, located in the spray test area, is inclined with the inclined surface facing the spray mechanism and the spray mechanism.

[0007] Furthermore, the front and rear walls of the test chamber of the test tank are made of transparent plexiglass. Titanium alloy heating plates are installed on the inner sides of the left and right walls of the test chamber. The titanium alloy heating plates are located in the spray test area, and a temperature sensor is also installed in the upper part of the test chamber.

[0008] Furthermore, the spraying mechanism includes a spray pump located in the equipment room of the test water tank and spray nozzles in the spray test area set in the test room. There are four nozzles, which are respectively set at the upper and lower ends of the two titanium alloy heating plates. The input end of the spray pump is connected to the output end of the magnetic pump through a pipe, and the output end of the spray pump is connected to the nozzles through a pipe.

[0009] Furthermore, the spraying mechanism includes a spray tower disposed at the upper end of the spraying area in the test chamber. There are two spray towers, which are respectively located between the titanium alloy heating plate and the upper nozzle on the left and right walls of the test chamber. The spraying mechanism also includes a balance water tank installed outside the test chamber. The liquid level in the balance water tank is higher than that in the spray tower. The output end of the magnetic pump is connected to the balance water tank through a pipe. The spraying mechanism also includes an air compressor, the output end of which is connected to the spray tower.

[0010] Furthermore, a drain hole A is provided at the bottom of the test chamber of the test water tank.

[0011] Furthermore, a vertical baffle is provided in the middle of the water supply tank, and a filter screen is provided on the top of the baffle. The baffle and the filter screen divide the interior of the water supply tank into two areas: a seawater filtration and sedimentation area and a clean seawater area. Drainage holes B are provided at the bottom of both the seawater filtration and sedimentation area and the clean seawater area. The magnetic pump is connected to the clean seawater tank.

[0012] Furthermore, the control module is located on the top of the water supply tank. The magnetic pump, spray pump, air compressor, and titanium alloy heating plate are electrically connected to the control module. The control module includes a display and an operator. The display is a touch screen, which displays icons for controlling the opening and closing of the magnetic pump, spray pump, air compressor, and titanium alloy heating plate. The operator consists of operation buttons, including an emergency stop button, a power button, and an adjustment knob. The control module also has an interface that can be inserted into a memory or connected to a computer.

[0013] Furthermore, the test frame is movable and placed inside the test chamber, and the bottom of the test water tank is equipped with casters.

[0014] The present invention also aims to provide an accelerated simulation verification test device and method for marine atmospheric and coastal environments, which employs the aforementioned accelerated simulation verification test device for marine atmospheric and coastal environments and follows the steps described above: I. Pre-experiment preparation a. Determine the test sample Before the test, the test samples were degreased and weighed in preparation. Check the water level in the seawater tank and replenish the seawater solution for the test. II. Trial Implementation Test Procedure 1: Spray Test Place the prepared test samples on the test rack at the top of the test chamber as required, start the seawater spray test, spray sea mist alternately for 24 hours, let stand for 24 hours, for a total of 96 hours; to better simulate the actual environment experienced by the product, the number of test cycles can be increased; Test Procedure Two: Spray Test Place the prepared test samples on the test rack at the top of the test chamber as required, start the seawater spray test, spray seawater alternately for 5 seconds, let stand for 25 seconds, for a total of 24 hours; to better simulate the actual environment experienced by the product, the number of test cycles can be increased. Test Procedure 3: Weekly Immersion Test Place the prepared test samples on the test rack at the bottom of the test chamber as required, and start the seawater immersion test. Alternately immerse the samples in seawater for 1 hour and dry them for 1 hour. During drying, heat the samples to 50°C for a total of 24 hours. To better simulate the actual environment experienced by the product, the number of test cycles can be increased. Experimental Procedure 4: Combined Simulation Verification Experiment Spray test Place the prepared test samples on the test rack on the upper part of the test chamber as required, start the seawater spray test, spray sea fog alternately for 24 hours, let stand for 24 hours, for a total of 48 hours; Spray test Start the seawater spraying test, spraying seawater alternately for 5 seconds, then letting it stand for 25 seconds, for a total of 24 hours; Weekly immersion test The test sample was moved to the test rack at the bottom of the test chamber and the seawater immersion test was started. The sample was alternately immersed in seawater for 1 hour and dried for 1 hour. During the drying process, the temperature was increased to 50°C for a total of 24 hours. III. Test Time Experimental procedures one, two, and three, with experimental durations ranging from 96 to 1920 hours, were respectively. The total time for implementing steps a to c in test procedure four is 96 hours, and the total test time is 96 to 2160 hours. IV. Results Analysis The coating samples were visually inspected in a 5-day cycle, and the inspection items included loss of gloss, discoloration, chalking, etc. The corrosion loss of the samples was examined after 5 days of testing, and the corrosion rate of the samples was calculated. Beneficial effects

[0015] This invention is not limited by geographical location. By setting reasonable parameters and modules, this invention helps to more realistically simulate marine atmospheric and coastal environmental corrosion conditions in different regions such as inland areas, and makes up for the shortcomings of traditional salt spray tests that cannot equivalently simulate marine atmospheric corrosion environments.

[0016] The test results are true, accurate, and reliable. This invention can accelerate the simulation of different corrosive environments such as marine atmosphere and splash, and has a good correspondence with coastal corrosive environments. This saves a lot of manpower, material resources, and financial resources, while ensuring the integrity of the test data and the reliability of the test structure.

[0017] Simple to operate and highly visual. This invention is directly controlled by a touch screen and a control module. A memory can also be inserted into the communication interface on the control module or connected to a computer, making it very simple and convenient to operate. The touch screen can directly display a series of status parameters in the test chamber, such as temperature, spray duration, spray flow rate and duration, and immersion time, making it easier to operate and control. The spray function can operate normally and continuously when unattended, saving a lot of manpower.

[0018] Facilitates observation. This invention enables the study of alternating wet and dry corrosion on product surfaces. By analyzing the correlation between the duration of the wet-dry alternation and the corrosion condition, the matching of experimental module values ​​can be improved. The outer shell of the experimental water tank in this invention is made of transparent plexiglass at both the front and back, allowing for timely observation of the experimental process.

[0019] The simulated environment is diverse and realistic. This invention uses a magnetic pump to precisely control the seawater flow rate, an air compressor to precisely control the spraying time, and a spray pump to precisely control the spraying time, thereby accelerating the simulation of real marine atmospheric and coastal environments; it also uses a digital temperature controller to accurately simulate the real temperature of the marine atmosphere.

[0020] The test tank has a drain hole at the bottom, through which seawater can be slowly drained after the test. Regularly changing the seawater can keep it fresh.

[0021] The test rack in the test tank of this invention can be used to hang samples and can be used to periodically check the dryness and wetness of the samples; the bottom of the test machine is also equipped with wheels for easy movement, which provides convenience for researchers to study the corrosion of products in marine atmospheric and coastal environments. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the accelerated simulation verification test device for marine atmospheric and coastal environment in Example 1; Figure 2This is a schematic diagram of the structure of the test water tank in Example 1. Detailed Implementation

[0023] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. However, the present invention is not limited to these embodiments. Any improvements or substitutions based on the basic spirit of these embodiments shall still fall within the scope of protection claimed by the present invention.

[0024] Example 1: As Figure 1 and 2 As shown, the present invention provides an accelerated simulation verification test device for marine atmospheric and coastal environments, including a test water tank 20, a water supply tank 21, and a control module 22.

[0025] The control module 22 is located on top of the water supply tank for easy operation by staff. The water supply tank contains seawater, and a vertical baffle 7 is installed in the middle of the tank from bottom to top. The two ends of the baffle are connected to the inner wall of the tank, and a filter screen 3 is installed on top of the baffle. The baffle and filter screen divide the interior of the water supply tank into two areas: a seawater filtration and sedimentation area 4 and a clean seawater area 6. New seawater is directly introduced into the seawater filtration and sedimentation area, where it settles. The settled water at the top is filtered through the filter screen and enters the clean seawater area. This prevents large particles of impurities from affecting the pump's operation. Furthermore, as one embodiment, drain holes B8 are provided at the bottom of both the seawater filtration and sedimentation area and the clean seawater area. These drain holes are used to drain the seawater, facilitating the movement or cleaning of the water supply tank.

[0026] The test water tank includes a lower equipment chamber 24 and an upper test chamber 25. The equipment chamber houses a magnetic pump 18 and a spray pump 13. The test chamber is equipped with a test rack 17 and is divided into a lower immersion test area and an upper spray test area. The spray test area contains a spraying mechanism and a misting mechanism. The outer wall of the test rack serves as a mounting surface for specimens. The lower mounting surface of the test rack in the immersion test area is vertical, while the upper mounting surface of the test rack in the spray test area is inclined, with the inclined surface facing the spraying and misting mechanisms. The input end of the magnetic pump is connected to the clean seawater area of ​​the water supply tank via a pipe, and the output end of the magnetic pump is connected to the spraying and misting mechanisms in both the immersion test area and the spray test area via pipes.

[0027] In the first embodiment of this invention, the front and rear walls of the test chamber of the test water tank are made of transparent plexiglass, while the left and right walls are made of PVC. A titanium alloy heating plate 11 is installed on the inner side of the left and right walls, located in the spray test area. A temperature sensor 16 is also installed in the upper part of the test chamber. The end cap 26 at the top of the test water tank, i.e., the top of the test chamber, is designed to be openable and connected to the main body via a hinge 15.

[0028] Furthermore, one of the output terminals of the magnetic pump is connected to the immersion test area, directly pumping clean seawater into the immersion test area. This allows the specimens hanging on the vertically mounted surface of the test frame to be completely immersed in the clean seawater for immersion testing and data acquisition. A liquid level sensor is also installed at the top of the immersion test area; once the clean seawater is detected and in place, a signal is sent to stop the pumping of clean seawater.

[0029] The spraying mechanism includes a spray pump located in the equipment chamber of the test water tank and spray nozzles 9 arranged in the spray test area within the test chamber. In this embodiment, there are four nozzles, respectively located at the upper and lower ends of the left and right walls of the test chamber. The titanium alloy heating plate is located between the upper and lower nozzles, ensuring that all specimens hanging on the inclined mounting surface of the test frame can be sprayed. Another output end of the magnetic pump is connected to the input end of the spray pump via a pipe, and the output end of the spray pump is connected to each of the four nozzles. Alternatively, the input end of the magnetic pump can be directly connected to the clean seawater area of ​​the water supply tank.

[0030] The spray mechanism includes two spray towers 10 located at the upper end of the spray area within the test chamber. These towers are situated on the left and right walls of the test chamber, respectively, between the titanium alloy heating plate and the upper nozzle. The spray mechanism also includes a balance water tank 23 installed outside the test chamber, with the upper liquid level of the tank higher than that of the spray towers. The output of the magnetic pump is connected to the balance water tank via a pipe. The spray mechanism also includes an air compressor 19, the output of which is connected to the spray towers.

[0031] As one embodiment of this invention, the bottom of the test chamber of the test tank is provided with a drain hole A12. The drain hole A12 is used to drain the clean seawater in the test chamber after the test is completed.

[0032] In this embodiment, the control module is located on top of the water supply tank. The magnetic pump, spray pump, air compressor, and titanium alloy heating plate are electrically connected to the control module. The control module incorporates a PLC circuit, circuit breaker, and logic circuit. The magnetic pump, spray pump, air compressor, and titanium alloy heating plate are controlled by the PLC circuit. The control module also includes a display and an operator. The display is a touch screen 1, which displays icons for temperature, immersion, spray, and misting. The operator consists of operation buttons, including an emergency stop button 5, a power button 22, and an adjustment knob 2. The adjustment knob can be used to adjust the temperature, immersion, spray flow rate, and misting flow rate. The control module also has a communication interface that can be inserted into a memory or connected to a computer for copying experimental data to the computer for analysis.

[0033] As one embodiment of this invention, the bottom of the test water tank is provided with rollers 14. Rollers can also be provided at the bottom of the water supply tank, which facilitates the movement of the equipment.

[0034] In this embodiment, metal samples such as steel, aluminum, zinc, and copper, along with the atmospheric corrosion monitoring module, are mounted on the test frame. An appropriate amount of seawater is injected into the water supply tank. The touchscreen is turned on, and the test mode (spray, mist, or perimeter immersion) is selected according to the test requirements. Using the perimeter immersion function, the magnetic pump 1 starts working after startup. Seawater from the water supply tank, filtered through a filter, flows into the test tank via pipeline. When the sensor detects that the water level has reached the specified level, the magnetic pump stops working, and the specimen is completely immersed in seawater for the perimeter immersion test. Before using the mist function, the air compressor needs to be turned on to reach the set value, and the mist pressure is set using the adjustment knob on the control module. The test temperature and mist duration are set in the mist function on the touchscreen. After starting the mist function, the water supply tank supplies water to the mist tower through the balance tank, the air compressor 1 supplies air to the mist tower through the pressure reducing valve, and the heating plate's heat output is adjusted in real time to achieve seawater mist spraying. When using the spray function, the spray duration and spray pressure are set on the touch screen. After the spray function is started, the water supply tank supplies water to the nozzles through the spray pump. The frequency converter adjusts the spray pump frequency in real time to realize seawater spraying.

[0035] This embodiment uses a combination of control modules, spray pumps, nozzles, air compressors, spray towers, and magnetic pumps to simulate the real conditions of spraying, splashing, and immersion in marine atmospheric and coastal environments, simulate the real temperature of marine atmospheric environments, and set the duration of each module.

[0036] Furthermore, this embodiment also provides an experimental method using the accelerated simulation verification test device for marine atmospheric and coastal environments in this embodiment, which specifically includes the following steps: I. Pre-experiment preparation a. Determine the test sample Before the test, the test samples were degreased and weighed in preparation. Check the water level in the seawater tank and replenish the seawater solution for the test. II. Trial Implementation Test Procedure 1: Spray Test Place the prepared test samples on the test rack at the top of the test chamber as required, start the seawater spray test, spray sea mist alternately for 24 hours, let stand for 24 hours, for a total of 96 hours; to better simulate the actual environment experienced by the product, the number of test cycles can be increased; Test Procedure Two: Spray Test Place the prepared test samples on the test rack at the top of the test chamber as required, start the seawater spray test, spray seawater alternately for 5 seconds, let stand for 25 seconds, for a total of 24 hours; to better simulate the actual environment experienced by the product, the number of test cycles can be increased. Test Procedure 3: Weekly Immersion Test Place the prepared test samples on the test rack at the bottom of the test chamber as required, and start the seawater immersion test. Alternately immerse the samples in seawater for 1 hour and dry them for 1 hour. During drying, heat the samples to 50°C for a total of 24 hours. To better simulate the actual environment experienced by the product, the number of test cycles can be increased. Experimental Procedure 4: Combined Simulation Verification Experiment Spray test Place the prepared test samples on the test rack on the upper part of the test chamber as required, start the seawater spray test, spray sea fog alternately for 24 hours, let stand for 24 hours, for a total of 48 hours; Spray test Start the seawater spraying test, spraying seawater alternately for 5 seconds, then letting it stand for 25 seconds, for a total of 24 hours; Weekly immersion test The test sample was moved to the test rack at the bottom of the test chamber and the seawater immersion test was started. The sample was alternately immersed in seawater for 1 hour and dried for 1 hour. During the drying process, the temperature was increased to 50°C for a total of 24 hours. III. Test Time Experimental procedures one, two, and three, with experimental durations ranging from 96 to 1920 hours, were respectively. The total time for implementing steps a to c in test procedure four is 96 hours, and the total test time is 96 to 2160 hours. IV. Results Analysis The coating samples were visually inspected in a 5-day cycle, and the inspection items included loss of gloss, discoloration, chalking, etc. The corrosion loss of the samples was examined after 5 days of testing, and the corrosion rate of the samples was calculated.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail can be made to it without departing from the scope defined by the claims of the present invention.

Claims

1. An accelerated simulation and verification experimental device for marine atmospheric and coastal environments, comprising an experimental water tank, a water supply tank, and a control module, characterized in that: The water supply tank contains seawater. The test tank includes an equipment room at the bottom and a test chamber at the top. The test chamber is equipped with a test rack and is divided into a circumferential immersion test area at the bottom and a spray test area at the top. The spray test area is equipped with a spraying mechanism and a misting mechanism. The equipment room is equipped with a magnetic pump. The input end of the magnetic pump is connected to the water supply tank through a pipe, and the output end of the magnetic pump is connected to the spraying mechanism and misting mechanism of the circumferential immersion test area and the spray test area through a pipe.

2. The accelerated simulation and verification test device for marine atmospheric and coastal environments as described in claim 1, characterized in that: The outer wall of the test frame is a mounting surface for hanging the test specimens. The lower part of the test frame, located in the circumferential immersion test area, is vertically arranged, while the upper part of the test frame, located in the spray test area, is inclined with the inclined surface facing the spray mechanism and the spraying mechanism.

3. The accelerated simulation and verification test device for marine atmospheric and coastal environments as described in claim 2, characterized in that: The front and rear walls of the test chamber of the test tank are made of transparent plexiglass. Titanium alloy heating plates are installed on the inner sides of the left and right walls of the test chamber. The titanium alloy heating plates are located in the spray test area, and a temperature sensor is also installed in the upper part of the test chamber.

4. The accelerated simulation and verification test device for marine atmospheric and coastal environment as described in claim 3, characterized in that: The spraying mechanism includes a spray pump located in the equipment room of the test water tank and spray nozzles in the spray test area set in the test room. There are four nozzles, which are respectively set at the upper and lower ends of the two titanium alloy heating plates. The input end of the spray pump is connected to the output end of the magnetic pump through a pipe, and the output end of the spray pump is connected to the nozzles through a pipe.

5. The accelerated simulation and verification test device for marine atmospheric and coastal environments as described in claim 4, characterized in that: The spraying mechanism includes two spray towers located at the upper end of the spraying area in the test chamber, one on the left wall and the other on the right wall of the test chamber, between the titanium alloy heating plate and the upper nozzle. The spraying mechanism also includes a balance water tank installed outside the test chamber, with the upper liquid level of the balance water tank higher than the spray towers. The output end of the magnetic pump is connected to the balance water tank via a pipe. The spraying mechanism also includes an air compressor, the output end of which is connected to the spray towers.

6. The accelerated simulation and verification test device for marine atmospheric and coastal environments as described in claim 5, characterized in that: The bottom of the test chamber of the test water tank is provided with a drain hole A.

7. The accelerated simulation and verification test device for marine atmospheric and coastal environments as described in claims 1, 2, 3, 4, 5, or 6, characterized in that: A vertical baffle is installed in the middle of the water supply tank, and a filter screen is installed on the top of the baffle. The baffle and the filter screen divide the interior of the water supply tank into two areas: a seawater filtration and sedimentation area and a clean seawater area. Drainage holes B are provided at the bottom of both the seawater filtration and sedimentation area and the clean seawater area. The magnetic pump is connected to the clean seawater tank.

8. The accelerated simulation and verification test device for marine atmospheric and coastal environment as described in claim 7, characterized in that: The control module is located on the top of the water supply tank. The magnetic pump, spray pump, air compressor, and titanium alloy heating plate are electrically connected to the control module. The control module includes a display and an operator. The display is a touch screen, which displays icons for controlling the opening and closing of the magnetic pump, spray pump, air compressor, and titanium alloy heating plate. The operator consists of operation buttons, including an emergency stop button, a power button, and an adjustment knob. The control module also has an interface for inserting a memory or connecting to a computer.

9. The accelerated simulation and verification test device for marine atmospheric and coastal environments as described in claim 8, characterized in that: The test rack is movable and placed inside the test chamber, and the bottom of the test water tank is equipped with casters.

10. A method for accelerated simulation and verification of marine atmospheric and coastal environments, characterized in that: The marine atmospheric and coastal environment accelerated simulation verification test apparatus as described in any one of claims 1-9 is used, and the following steps are performed: I. Pre-experiment preparation a. Determine the test sample Before the test, the test samples were degreased and weighed in preparation. Check the water level in the seawater tank and replenish the seawater solution for the test. II. Trial Implementation Test Procedure 1: Spray Test Place the prepared test samples on the test rack on the upper part of the test chamber as required, start the seawater spray test, spray sea fog alternately for 24 hours, let stand for 24 hours, for a total of 96 hours, and cycle at least once; Test Procedure Two: Spray Test Place the prepared test samples on the test rack on the upper part of the test chamber as required, start the seawater spray test, spray seawater alternately for 5 seconds, let stand for 25 seconds, for a total of 24 hours, and repeat once or more. Test Procedure 3: Weekly Immersion Test Place the prepared test samples on the test rack at the bottom of the test chamber as required, start the seawater immersion test, and alternately immerse in seawater for 1 hour and dry for 1 hour. During drying, heat to 50°C for a total of 24 hours, and cycle at least once. Experimental Procedure 4: Combined Simulation Verification Experiment Spray test Place the prepared test samples on the test rack on the upper part of the test chamber as required, start the seawater spray test, spray sea fog alternately for 24 hours, let stand for 24 hours, for a total of 48 hours; Spray test Start the seawater spraying test, spraying seawater alternately for 5 seconds, then letting it stand for 25 seconds, for a total of 24 hours; Weekly immersion test The test sample was moved to the test rack at the bottom of the test chamber and the seawater immersion test was started. The sample was alternately immersed in seawater for 1 hour and dried for 1 hour. During the drying process, the temperature was increased to 50°C for a total of 24 hours. III. Test Time Experimental procedures one, two, and three, with experimental durations ranging from 96 to 1920 hours, were respectively. The total time for implementing steps a to c in test procedure four is 96 hours, and the total test time is 96 to 2160 hours. IV. Results Analysis The coating samples were visually inspected in a 5-day cycle, and the inspection items included loss of gloss, discoloration, and chalking. The corrosion loss of the samples was examined after 5 days of testing, and the corrosion rate of the samples was calculated.

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