An experimental device for simulating the corrosion environment of the ocean splash zone and a method of using the same

Abstract

The present invention relates to an experimental device and a method for using a simulated corrosion environment in an ocean splash zone, comprising a simulated dry environment experimental box arranged at the upper part and an immersion corrosion experimental box arranged at the lower part; the simulated dry environment experimental box comprises an experimental box body, a constant temperature device, a fan, and a sample steel lifting device; a sample steel lifting device is arranged in the experimental box body, and a fan and a constant temperature device are respectively fixed on both sides; a sample hanging frame is used to fix the sample; the sample steel lifting device drives the sample to enter and exit the corrosion experimental tank; a water bath temperature control device is used to adjust the liquid temperature in the corrosion experimental tank. The advantages are: the running time is set by the lifting stroke of the sample; the temperature of the corrosive liquid is adjusted by the water bath temperature control device, and the simulated dry environment experimental box is provided with a constant temperature device and a fan, which can realize rapid drying of the sample, and truly simulate the influence of the seawater temperature in the ocean splash zone and the drying speed of the ocean steel on the changes of the external temperature during the day and night.

Description

Technical Field

[0001] The invention belongs to the technical field of corrosion and protection of metal materials, and in particular relates to an experimental device for simulating the corrosion environment of an ocean splash zone and a use method thereof. Background Art

[0002] The composition of seawater is complex, and marine machinery and equipment are often in an alternating dry and wet environment, which leads to serious corrosion and high-speed corrosion of equipment parts, resulting in equipment failure, which seriously threatens safe production. In addition, in the ocean splash zone, the corrosion effect of the area is particularly significant due to the splashing and scouring of seawater, alternating dry and wet, sun exposure, and full surface aeration. The corrosion of steel structures in the irrigation area is very serious, causing great economic losses; therefore, it is very important to study the corrosion behavior of this complex dry and wet environment. However, due to the limitations of actual conditions, laboratory corrosion experiments that simulate such environments are generally used to infer the corrosion behavior of metals in this actual environment; due to the complexity of the actual environment, simulation experiments need to control many parameters such as temperature, humidity, pH value, wave size and amplitude, and the devices and methods for simulating such experiments are also uneven, so it is very important to actively explore experimental devices and implementation methods that can simulate such complex corrosion environments that are closest to reality.

[0003] At present, the existing experimental devices and methods for simulating metal corrosion in complex environments such as the ocean at home and abroad mostly use salt spray chambers for simulation experiments. In addition, there are some rocking plate type, piston type, and push plate type wave makers to simulate marine corrosion environments. Patent No.: CN 208568231U, discloses an integral rocking plate wave maker with an adjustable lifting mechanism; Patent No.: CN201649711 U, discloses a vacuum wave maker; Patent No.: CN 109342309 A discloses a test device and test method for simulating marine corrosion environment; these devices have played a great role in previous simulation experiments, but there are also some limitations, such as the fog box simulation experiment can only use periodic salt spray corrosion instead of the completely dry and completely immersed periodic corrosion experiment, and cannot truly simulate the corrosion environment of seawater splashing and immersion; in addition, the existing wave-making device cannot truly simulate the wave state of the seawater splash zone, and there are also problems such as complex pipeline system, large pressure loss, and low efficiency; the existing experimental equipment of this type also lacks the situation of simulating the dry state, and the drying speed of marine steel is also affected by the external day and night temperature difference; the periodic immersion corrosion test box manufactured by Tarrant Instruments can perform a single periodic corrosion experiment, but due to the lack of a wave-making device, it cannot truly simulate the corrosion environment of the seawater splash zone, and its price is expensive and cannot be widely used in general small and medium-sized research institutes and laboratories of ordinary universities. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide an experimental device and a method for using the experimental device for simulating the corrosion environment of the ocean splash zone, which can fully simulate the corrosion environment of the ocean splash zone and be used to simulate the periodic corrosion experiment of marine steel in the seawater splash zone. It can also be used to simulate the full immersion, semi-immersion, and periodic immersion corrosion experiments of metal materials in different corrosive liquids; reduce equipment costs and reduce energy consumption.

[0005] To achieve the above object, the present invention is implemented through the following technical solutions:

[0006] An experimental device for simulating the corrosion environment of an ocean splash zone comprises a simulated dry environment experimental box arranged at an upper part and an immersion corrosion experimental box arranged at a lower part.

[0007] The simulated dry environment test box comprises a test box body, a constant temperature device, a fan, and a sample steel lifting device; the test box body is provided with a sample steel lifting device, and a fan and a constant temperature device are fixed on both sides;

[0008] The sample steel lifting device comprises a sample hanging frame, a rotating shaft, a corrosion-resistant winding, a bidirectional DC motor, and two small pulleys. The rotating shaft is arranged on the top of the experimental box, the rotating shaft is connected to the sample hanging frame through a bearing, the end of the rotating shaft is fixedly connected to a small pulley, and the other small pulley is fixedly connected to the output shaft of the bidirectional DC motor. The two small pulleys are connected through a belt, and the bidirectional DC motor drives the other small pulley to rotate. The next small pulley rotates under the drive of the belt, thereby driving the rotating shaft to rotate; the corrosion-resistant winding is fixedly connected to the rotating shaft, and the end of the corrosion-resistant winding is fixedly connected to the sample hanging frame; the sample hanging frame is used to fix the sample;

[0009] The immersion corrosion test box includes a corrosion test tank, a water bath temperature control device, and a wave making device;

[0010] The wave-making device comprises a wave-making motor, a transmission shaft, a wave-making board, a wave-making frame, and two mutually meshing bevel gears. The output shaft of the wave-making motor is fixedly connected to the transmission shaft through a coupling, the transmission shaft is fixedly connected to one bevel gear, and the other bevel gear is fixedly connected to the wave-making frame. Wave-making boards are evenly distributed radially on the wave-making frame, and the wave-making boards are arranged in a corrosion test tank.

[0011] The sample steel lifting device drives the sample in and out of the corrosion test tank; the water bath temperature control device is used to adjust the liquid temperature in the corrosion test tank.

[0012] The bidirectional DC motor is connected with a speed regulator.

[0013] The surface of the wave-making plate, the surface of the wave-making frame, the surfaces of the two bevel gears and the inner wall of the corrosion test tank are all covered with Ni-P coating.

[0014] A method for using an experimental device for simulating a corrosion environment in an ocean splash zone comprises the following steps:

[0015] 1) Make a specimen of marine steel and connect it to the specimen hanger; inject the corrosion liquid simulating seawater into the corrosion test tank, adjust the temperature of the corrosion liquid, and adjust the pH value of the corrosion liquid;

[0016] 2) Start the wave-making device, set the size and amplitude of the corrosive liquid wave; set the test period to 24 to 600 hours, and set the time of the drying and wetting stages of the periodic corrosion test cycle;

[0017] 3) Start the experiment. The sample steel lifting device drives the sample in the constant temperature corrosion test tank. The sample is fully infiltrated and corroded. After the full infiltration corrosion of the set immersion time is completed, the sample steel lifting device drives the sample to be transferred from the corrosive liquid to the drying box. The time for the sample to rise and fall is 19 to 20 seconds. After the set drying time is completed, the sample steel lifting device drives the sample to be transferred from the drying box to the corrosive liquid, so that the sample realizes periodic corrosion in two dry and wet corrosion environments;

[0018] 4) After the experiment is completed, take out the sample to carry out various corrosion tests, and then carry out the periodic immersion corrosion test of the sample.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1) The sample steel lifting device can adjust four operating variables, namely, immersion time, rising time, drying time, and descending time. The operating time is set by the lifting stroke of the sample. The required periodic corrosion test can also be performed by setting different immersion and drying times;

[0021] The temperature of the corrosive liquid is adjusted by a water bath temperature control device, and a constant temperature device and a fan are set in a simulated dry environment test box to achieve rapid drying of the sample, truly simulating the influence of the seawater temperature in the ocean splash zone and the drying speed of marine steel on the changes in external temperature during the day and night.

[0022] 2) Wave-making device: The wave-making motor drives the wave-making board to rotate. The radially evenly distributed wave-making board increases the collision area between the corrosive liquid and the wave-making board. From the perspective of corrosion, the marine environment is generally divided into the marine atmosphere zone, the wave splash zone (seawater splashes can splash into this zone, but this zone is not immersed in the seawater when the seawater is high tide), the tidal range zone (the seawater is submerged when the seawater is high tide and exposed to the atmosphere when the seawater is low tide), the seawater full immersion zone (always immersed in seawater) and the seabed mud zone (always in the seabed mud). Compared with the previous wave-making device, the seawater splash state created by the rotary wave-making can more realistically simulate the wave type of the seawater in the splash zone.

[0023] 3) It has achieved the same or even better level as existing equipment in achieving the expected functions and simulation experiment effects, and the manufacturing cost has been greatly reduced. It is simple to operate and low in price. It can be widely used in laboratories of small and medium-sized research institutes and ordinary universities.

[0024] 4) This device uses chemical deposition method to prepare Ni-P coating, and adopts chromium-free, low-consumption and environmentally friendly process conditions. Chemical deposition obtains uniform Ni-P coating, and greatly improves various properties, especially corrosion resistance. In the absence of external current, Ni 2+ A reduction reaction occurs, and the generated Ni atoms adhere to the surface of the plated parts, forming a layer of nickel plating to protect the plated parts. It has high corrosion resistance for bipolar plates, and the composite Ni-P plating has the best effect in improving corrosion resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the external structure of the experimental device for simulating the corrosion environment of the ocean splash zone.

[0026] Figure 2 This is the front view of the experimental device for simulating the corrosion environment of the ocean splash zone.

[0027] Figure 3 It is a side view of the experimental device for simulating the corrosion environment of the ocean splash zone.

[0028] Figure 4 It is a structural diagram of the immersion corrosion test box.

[0029] Figure 5 It is a working principle diagram of the experimental device for simulating the corrosion environment of the ocean splash zone.

[0030] Figure 6 It is the schematic diagram of the specimen steel lifting device.

[0031] Figure 7 This is the main circuit schematic diagram of the wave-making motor.

[0032] Figure 8 It is the control circuit schematic diagram of the lifting motor.

[0033] In the figure: 1- sample steel lifting device 2- motor and instrument storage box 3- control console 4- simulated dry environment test box 5- fan 6- immersion corrosion test box 7- wave motor 8- sample hanging frame 9- constant temperature device 10- lifting motor 11- corrosion test tank 12- wave frame 13- water bath temperature control device 14- bevel gear 15- wave plate 16- small pulley 17- belt 18- rotating shaft 19- outer box 20- sample 21- transmission shaft 22- corrosive liquid 23- water storage part. DETAILED DESCRIPTION

[0034] The present invention is described in detail below in conjunction with the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0035] See Figure 1-Figure 8 , an experimental device for simulating the corrosion environment of the ocean splash zone, comprising a simulated dry environment experimental box 4 arranged at the upper part and an immersion corrosion experimental box 6 arranged at the lower part;

[0036] The simulated dry environment test box 4 includes a test box body, a constant temperature device 9, a fan 5, and a sample steel lifting device 1; the test box body is provided with a sample steel lifting device 1, and a fan 5 and a constant temperature device 9 are fixed on both sides; the outside of the test box body is fixed with a motor and instrument storage box 2 and a control console 3 for storing motors, instruments and other power devices.

[0037] The sample steel lifting device 1 includes a sample hanging frame 8, a rotating shaft 18, a corrosion-resistant winding, a bidirectional DC motor, and two small pulleys 16. The rotating shaft 18 is arranged on the top of the experimental box. The rotating shaft 18 is connected to the sample hanging frame 8 through a bearing. The end of the rotating shaft 18 is fixedly connected to a small pulley 16, and the other small pulley 16 is fixedly connected to the output shaft of the bidirectional DC motor. The two small pulleys 16 are connected through a belt 17. The bidirectional DC motor drives the other small pulley 16 to rotate. The next small pulley 16 rotates under the drive of the belt 17, thereby driving the rotating shaft 18 to rotate; the corrosion-resistant winding is fixedly connected to the rotating shaft 18, and the end of the corrosion-resistant winding is fixedly connected to the sample hanging frame 8; the sample hanging frame 8 is used to fix the sample 20. The bidirectional DC motor is connected to a speed regulator.

[0038] The constant temperature device 9 includes a temperature sensor, a heat preservation lamp and an induction switch. The temperature sensor is used to detect the temperature of the drying box and feed back to the heat preservation lamp switch. When the temperature is lower than the minimum set value, the heat preservation lamp circuit is heated. When the temperature is higher than the maximum set value, the circuit is disconnected and heating is stopped, thereby making the temperature of the drying box reach a constant value.

[0039] The fan 5 is provided with a timing switch, and the on time is set. When the sample 20 is in the drying box stage, the fan 5 works to quickly dry the sample 20. The off time of the timing switch is the sum of the time of the sample 20 in the descending stage, the immersion stage, and the ascending stage.

[0040] The sample steel lifting device 1 includes a sample hanging frame 8, a rotating shaft 18, a corrosion-resistant winding, a lifting motor 10, and two small pulleys 16. The rotating shaft 18 is arranged on the top of the drying box. The rotating shaft 18 is connected to the sample hanging frame 8 through a bearing. The end of the rotating shaft 18 is fixedly connected to a small pulley 16, and the other small pulley 16 is fixedly connected to the output shaft of the lifting motor 10. The two small pulleys 16 are connected through a belt 17. The lifting motor 10 drives the other small pulley 16 to rotate. The next small pulley 16 rotates under the drive of the belt 17, thereby driving the rotating shaft 18 to rotate; the corrosion-resistant winding is fixedly connected to the rotating shaft 18, and the end of the corrosion-resistant winding is fixedly connected to the sample hanging frame 8; the sample hanging frame 8 is used to fix the sample 20. The bidirectional DC motor that controls the lifting is connected to a circuit board and a speed regulator that control the forward, reverse and static timing of the motor.

[0041] The sample 20 lifting motor 10 can realize the working states of forward rotation, stop, reverse rotation and stop. On the YF-8 DC motor forward and reverse rotation control panel, the wetting, drying and lifting time can be set, so that the sample 20 can reach the corresponding rising, drying, descending and immersion states as the motor runs forward, stop, reverse and stop.

[0042] The immersion corrosion test box 6 includes a corrosion test tank 11, a water bath temperature control device 13, and a wave making device; the sample steel lifting device 1 drives the sample 20 to enter and exit the corrosion test tank 11; the water bath temperature control device 13 is used to adjust the liquid temperature in the corrosion test tank 11.

[0043] The water bath temperature control device 13 is composed of a water bath, a temperature sensor, a heater and an induction switch. When the temperature of the corrosive liquid 22 is lower than the minimum set value, the temperature sensor feeds back the induction switch, the heater circuit is open, and the water in the water bath starts to be heated to the set value. Then the temperature sensor feeds back the induction switch to disconnect the heater. Then the temperature of the corrosive liquid 22 in the corrosive tank placed in the water bath is kept constant.

[0044] The wave-making device comprises a wave-making motor 7, a transmission shaft 21, a wave-making board 15, a wave-making frame 12, and two mutually meshing bevel gears 14. The output shaft of the wave-making motor 7 is fixedly connected to the transmission shaft 21 through a coupling, the transmission shaft 21 is fixedly connected to one bevel gear 14, and the other bevel gear 14 is fixedly connected to the wave-making frame 12. The wave-making boards 15 are evenly distributed radially fixed on the wave-making frame 12. Figure 5 There are four wave-making boards 15, which are arranged in the corrosion test tank 11. The wave-making motor 7 and the frequency converter, the bidirectional DC motor and the speed regulating device are all controlled by the PLC controller arranged in the control box. The rotation of the wave-making board 15 can provide the corrosive liquid 22 in the corrosion tank with waves of suitable amplitude and size, and a more realistic wave type of the seawater in the splash zone.

[0045] With the cooperation of the PLC controller and the frequency converter, the wave-making motor 7 drives the wave-making plates 15 to rotate back and forth. The four wave-making plates 15 rotate and collide with the corrosive liquid 22, which can provide the corrosive liquid 22 with waves of suitable amplitude and size, and more realistically simulate the wave type of the seawater in the splash zone.

[0046] The surface of the wave-making plate 15, the surface of the wave-making frame 12, the surface of the two bevel gears 14 and the inner wall of the corrosion test tank 11 are all covered with Ni-P coating, so that they can operate stably for a long time and extend their service life.

[0047] The constant temperature device 9 can realize the temperature control in the drying stage and the rapid drying of the sample 20, and can truly simulate the influence of the drying speed of marine steel on the change of the external temperature during the day and night. The water bath temperature control device 13 regulates the temperature of the corrosive liquid 22 to simulate the change of the temperature of the seawater in the marine splash zone. The whole equipment operates stably under the set experimental time cycle, realizing the automatic lifting and timing stay of the sample 20 in the dry and wet corrosion environment, thereby simulating a more realistic corrosion environment of marine steel in the seawater splash zone. The equipment parameters are shown in Table 1:

[0048] Table 1 Equipment parameters

[0049]

[0050] A method for using an experimental device for simulating a corrosion environment in an ocean splash zone comprises the following steps:

[0051] 1) A specimen 20 is made of marine steel and connected to a specimen hanger; a corrosion liquid 22 simulating seawater is injected into a corrosion test tank 11, the temperature of the corrosion liquid 22 is adjusted, and the pH value of the corrosion liquid 22 is adjusted; the temperature of the drying box is adjusted, and the working time of the air supply fan 5 is set.

[0052] 2) Start the wave-making device, set the size and amplitude of the corrosive liquid 22 wave; set the test period to 24 to 600 hours, and set the time of the drying and wetting stages of the periodic corrosion test cycle;

[0053] 3) Start the experiment, the sample steel lifting device 1 drives the sample 20 in the constant temperature corrosion test tank 11, the sample 20 is fully infiltrated and corroded, after the full infiltration corrosion of the set immersion time is completed, the sample steel lifting device 1 drives the sample 20 to transfer from the corrosive liquid 22 to the drying box, the rising and falling time of the sample 20 is 19 to 20 seconds, after the set drying time is completed, the sample steel lifting device 1 drives the sample 20 to transfer from the drying box to the corrosive liquid 22, so that the sample 20 realizes periodic corrosion in two dry and wet corrosion environments;

[0054] 4) After the experiment is completed, take out the sample 20 to carry out various corrosion tests, and then implement the periodic immersion corrosion test of the sample 20.

[0055] Example:

[0056] The dimensions of the sample 20 are: 60 mm*40 mm*4 mm and 20 mm*15 mm*4 mm.

[0057] A dense Ni-P coating is prepared on the inner wall of the corrosion test tank 11 (mainly the water storage part 23), the wave-making plate 15, the wave-making frame 12, the transmission shaft 21 and other core components by chemical plating process; a corrosive liquid 22 is prepared: a NaCl solution with a concentration of 3.5%; the corrosive liquid 22 is injected into the corrosion test tank 11, and the pH value of the corrosion environment is adjusted with a weak acid or a weak base; the temperature of the corrosive liquid 22 is controlled at 25-27°C; the samples 20 are respectively connected to the sample hanging frame 8, the frequency and running stroke of the wave-making plate 15 are set, and the frequency converter of the wave-making motor 7 is adjusted to drive the wave-making plate 15 to rotate. The speed of the lifting motor 10 is controlled at 9-10 r / min to ensure that the rising and falling time of the sample 20 is controlled at 19-20 s (this time is determined by the motor speed, and by adjusting the immersion depth of the sample 20, the distance from the immersion point of the sample 20 to the static point of the sample 20 in the drying area is adjusted to a fixed value of 200-250 mm as the lifting stroke of the sample 20, and the lifting time is calculated) and the full immersion of the sample 20 is set to the initial state; the time of the wetting stage in the corrosion cycle is set to 9-11 minutes, the time of the drying stage is set to 49-51 minutes, the time of the forward and reverse operation of the lifting motor 10 is set to 19-20 seconds, the drying time of the sample 20 in the simulated dry environment test box 4 is set to 50 minutes (this time is determined by the time of the drying stage), and the immersion time of the sample 20 in the corrosion liquid 22 is set to 10 minutes (determined by the time of the wetting stage). The experimental period can be set to 24h, 72h, 168h, 288h, 432h, 600h according to the standard GBT19746-2005. After the experiment, the sample 20 is taken out, and further corrosion measurement is performed on it, the water storage part 23 is taken out, and the corrosive liquid 22 is cleaned up.

[0058] The surface of the wave-making plate 15, the surface of the wave-making frame 12, the surface of the two bevel gears 14, the surface of the transmission shaft 21 and the inner wall of the corrosion test tank 11 are coated with Ni-P coating, and after the coating treatment, they can operate stably for a long time. The specific method is as follows:

[0059] (1) Pretreatment of plating: Use water-abrasive sandpaper to polish the surface of the parts to be plated to make them smooth, then wash the parts with deionized water, dry them, and immerse them in 1000 ml of alkaline degreasing solution (20 g / L NaOH, 20 g / L Na 2 CO 3), and adjust the temperature to a constant 69-71°C for 5 minutes to achieve the effect of removing oil stains on the parts. The degreased parts are acidified with a 10% HF solution for 3 minutes to remove the oxide film on the parts.

[0060] (2) Plating solution configuration: Formula: 21.9~22.1g / L NiSO 4 6H 2 O, 19.9-20.1 g / L NaH 2 PO 2 ·5H 2 O, 9.90-10.1 g / L NH 4 HF 2 , 14.9~15.1g / L Na 3 C 6 H 5 O 7 ·2H 2 O, 0.08~0.10g / L(CH 3 COO 2 Pb, 0.08~0.10g / LC 12 H 25 SO 4 Na, weigh the appropriate amount of medicine according to the formula before the experiment and dissolve it for use. During the experiment, first add the complexing agent Na 3 C 6 H 5 O 7 ·2H 2 O is poured into the saline solution NiSO 4 6H 2 O, and after complete mixing, add the stabilizer NH 4 HF 2 , then the buffer solution (CH 3 COO 2 Pb is poured into the reaction device and surfactant C is added 12 H 25 SO 4 Na, after they are fully mixed, the reducing agent NaH is finally added 2 PO 2 ·5H 2 O.

[0061] (3) Chemical plating of Ni-P coating: The polished parts are subjected to degreasing and pickling activation processes in accordance with step (1), and then taken out and quickly placed in the plating solution. The plating temperature is constant at 84-85°C, the pH is 7.1-7.3, and the time is 1.9-2.1 hours. Then, they are washed with deionized water at 84-85°C, rinsed with deionized water at room temperature, and dried. Finally, a uniform and dense Ni-P coating is prepared on the parts.

[0062] The internal temperature of the above-mentioned drying test box can be controlled by a circuit system composed of a temperature sensor, a heat preservation lamp and an induction switch. By controlling the circuit of the low-power air supply fan through a timing switch controller, the sample 20 in the drying box can be quickly dried, simulating the rapid drying of the corroded surface of marine steel in the wave splash area by sea breeze.

[0063] The immersion corrosion test box 6 controls the temperature of the corrosive liquid 22 through the water bath temperature control device 13 to simulate the influence of the temperature of seawater in the ocean splash zone on the corrosion of marine engineering steel; in the set experimental time period, the sample 20 is raised and lowered in the dry and wet corrosion environment for a timed stay, so as to simulate a more realistic corrosion environment of marine steel in the seawater splash zone.

[0064] The device of the present invention has a simple structure and is easy to operate. It also has the functions of adjusting the temperature of dry and wet environments, rapid wind drying, wave making, etc. By setting the time and temperature of the circuit controllers of each device of the equipment, the experimental time cycle can be automatically controlled and run smoothly for a long time, so as to simulate the real corrosion environment of marine steel caused by the alternating dry and wet seawater in the splash zone. The device is mainly used to simulate the periodic corrosion experiment of marine steel in the seawater splash zone, and can also be used to simulate the full immersion, semi-immersion, and periodic immersion corrosion experiments of metal materials in different corrosive liquids 22.

Claims

1. An experimental device for simulating the corrosion environment of the ocean splash zone, characterized in that: It includes a simulated dry environment test box arranged at the upper part and an immersion corrosion test box arranged at the lower part; The simulated dry environment test box comprises a test box body, a constant temperature device, a fan, and a sample steel lifting device; the test box body is provided with a sample steel lifting device, and a fan and a constant temperature device are fixed on both sides; The sample steel lifting device comprises a sample hanging frame, a rotating shaft, a corrosion-resistant winding, a bidirectional DC motor, and two small pulleys. The rotating shaft is arranged on the top of the experimental box, the rotating shaft is connected to the sample hanging frame through a bearing, the end of the rotating shaft is fixedly connected to a small pulley, and the other small pulley is fixedly connected to the output shaft of the bidirectional DC motor. The two small pulleys are connected through a belt, and the bidirectional DC motor drives the other small pulley to rotate. The next small pulley rotates under the drive of the belt, thereby driving the rotating shaft to rotate; the corrosion-resistant winding is fixedly connected to the rotating shaft, and the end of the corrosion-resistant winding is fixedly connected to the sample hanging frame; the sample hanging frame is used to fix the sample; The immersion corrosion test box includes a corrosion test tank, a water bath temperature control device, and a wave making device; The wave-making device comprises a wave-making motor, a transmission shaft, a wave-making board, a wave-making frame, and two mutually meshing bevel gears. The output shaft of the wave-making motor is fixedly connected to the transmission shaft through a coupling, the transmission shaft is fixedly connected to one bevel gear, and the other bevel gear is fixedly connected to the wave-making frame. Wave-making boards are evenly distributed radially on the wave-making frame. The wave-making boards are located at the end of the wave-making frame away from the axis, and the wave-making boards are vertically arranged in the corrosion test tank. The sample steel lifting device drives the sample to enter and exit the corrosion test tank; the water bath temperature control device is used to adjust the liquid temperature in the corrosion test tank; the bidirectional DC motor is connected to a speed regulator; The method for using the experimental device for simulating the corrosion environment of the ocean splash zone comprises the following steps: 1) The specimen is made of marine steel and connected to the specimen hanger; the corrosion liquid simulating seawater is injected into the corrosion test tank, and the temperature and pH value of the corrosion liquid are adjusted; 2) Start the wave-making device, set the size and amplitude of the corrosive liquid wave; set the test cycle to 24~600h, and set the time of the drying and wetting stages of the periodic corrosion test cycle; 3) Start the experiment. The sample steel lifting device drives the sample in the constant temperature corrosion test tank. The sample is fully infiltrated and corroded. After the full infiltration corrosion of the set immersion time is completed, the sample steel lifting device drives the sample to be transferred from the corrosive liquid to the drying box. The rising and falling time of the sample is 19-20s. After the set drying time is completed, the sample steel lifting device drives the sample to be transferred from the drying box to the corrosive liquid, so that the sample realizes periodic corrosion in two dry and wet corrosion environments; 4) After the experiment is completed, take out the sample to carry out various corrosion tests, and then carry out the periodic immersion corrosion test of the sample.

2. The experimental device for simulating the corrosion environment of the ocean splash zone according to claim 1 is characterized in that: The surface of the wave-making plate, the surface of the wave-making frame, the surfaces of the two bevel gears and the inner wall of the corrosion test tank are all covered with Ni-P coating.

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