A polar marine corrosion environment simulation system

Abstract

The application provides a polar marine corrosion environment simulation system, and belongs to the technical field of polar marine environment simulation. The system comprises a test box, a workbench, a cold air box, a fan, a refrigerator, a seawater tank, a test barrel, a solution pipe, a cold air pipe, a retainer, a sample holder and a temperature control system. The whole simulation system comprises a light mode, a floating ice mode, an ocean current mode and a freeze-thaw mode. The test box and the cold air box are installed on the workbench, and the refrigerator and the seawater tank are placed under the workbench. The refrigerator and the seawater tank are connected with the cold air box and the test barrel on the workbench through pipelines to complete the work of conveying cold air and simulating corrosion solution. The fan is installed on the left wall of the cold air box and opposite to the air inlet of the cold air box to exchange air. The sample holder is installed on a ball screw and can move up and down to realize simulation experiments on different areas of the sample. The temperature control system can realize accurate control of the temperature of the whole system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of polar marine corrosion environment simulation, in particular to a polar marine corrosion environment simulation system. BACKGROUND

[0002] With the continuous development of society and the gradual depletion of land resources, people begin to pay more attention to the development and utilization of marine resources. Contacting the sea inevitably requires the use of various materials, and seawater is a complex electrolyte with strong corrosion. Various materials are tested in harsh conditions in marine environment at any time. According to statistics, the loss caused by marine corrosion accounts for about one-third of the total corrosion loss every year. At present, the seawater corrosion test of materials mainly relies on seawater natural environment test station, which is carried out by real sea hanging piece. In many places in China, seawater natural environment test stations have been built, covering the characteristics of seawater environment from north to south in different sea areas, and a large amount of material corrosion data has been accumulated, which provides scientific basis and important technical support for material design, material selection and new material development in the fields of marine ships, platforms, ports and wharfs. However, it is very difficult to carry out the test in polar marine environment because there is no such marine environment in the adjacent sea area of China, and it is impossible to carry out real sea test nearby. Moreover, although the real sea test has the advantages of true and accurate, it also has the following disadvantages: first, the test workload is large, and a lot of manpower and material resources are consumed; second, the test period is long, and it is difficult to meet the needs of new material development in time; third, the test conditions are uncontrollable, and it is difficult to carry out systematic research. Therefore, it is urgent to develop and design an experimental equipment for corrosion simulation in polar marine environment to fill this gap. By developing corrosion simulation test system for different zonal seawater environment, on the one hand, it can be an important supplement to real sea test, and on the other hand, it can realize the comprehensive understanding of the corrosion behavior and mechanism of materials by combining with other laboratory research methods.

[0003] Nowadays, the marine corrosion simulation systems on the market are mostly closed design, which can only immerse or spray the whole sample for corrosion treatment. If the sample is long, the volume of the corrosion box also needs to be increased accordingly, which not only cannot realize the local directional corrosion of the sample, but also occupies a large amount of test site space, resulting in increased cost. In addition, the simulation environment of these systems has low restoration degree, insufficient automation degree and single mode, and the operation is difficult. Therefore, it is particularly important to carry out research on the corrosion simulation test system in polar marine environment, especially to more comprehensively and truly simulate the corrosion state of polar marine environment, so as to more accurately and conveniently obtain the corrosion behavior and mechanism information of marine materials. SUMMARY

[0004] In view of the defects in the prior art, the purpose of the present application is to provide a polar marine corrosion environment simulation system, which comprises a test box, a cold gas box, a refrigerator and a temperature control system, the test box is provided with a test barrel, and the temperature control system comprises a control unit and a purple light.

[0005] The polar marine corrosion environment simulation system is provided with an illumination mode, a floating ice mode, an ocean current mode and a freeze-thaw mode; when the illumination mode is selected, the control unit controls the violet light lamp to increase illumination, simulating the long-time illumination or no-illumination state in the polar marine area; when the floating ice mode is selected, the control unit controls the refrigerating device and the cold air tank to start working, rapidly cooling down, so that the simulated corrosion solution in the test barrel generates floating ice; when the ocean current mode is selected, the control unit controls the rotating speed of the test barrel, simulating the seabed ocean current under the polar marine environment; when the freeze-thaw mode is selected, the temperature control system selects the freeze-thaw temperature range and the freeze-thaw times, and the control unit controls the refrigerating device and the violet light lamp to work in cycles, so as to simulate the freeze-thaw cycle of the polar marine environment by selecting the freeze-thaw temperature range and the freeze-thaw times.

[0006] In the preferred embodiment, the test barrel is provided with a plurality of ice-breaking rods which are installed circumferentially on the bottom of the test barrel; the ice-breaking rods and the self-rotation of the test barrel make the solution surface generate floating ice.

[0007] In the preferred embodiment, the polar marine corrosion environment simulation system further comprises a seawater tank, a workbench, a solution pipe and a cold air pipe; the test tank and the cold air tank are installed on the workbench; the refrigerating device and the seawater tank are installed under the workbench; the refrigerating device and the seawater tank are connected with the test barrel through the solution pipe, so as to transport the simulated corrosion solution; the refrigerating device is connected with the cold air tank through the cold air pipe, so as to transport the cold air.

[0008] In the preferred embodiment, the polar marine corrosion environment simulation system is in a closed state, the illumination is provided by the violet light lamp in the temperature control system, and the polar day and polar night phenomenon in the polar area is simulated by controlling the working time length of the violet light lamp.

[0009] In the preferred embodiment, the inside of the test tank is provided with a temperature sensor; the temperature sensor transmits the detected temperature information to the control unit, and the control unit selects to start the violet light lamp or the refrigerating device according to the received temperature information.

[0010] In the preferred embodiment, the polar marine corrosion environment simulation system comprises a sample holder which comprises a ball screw, an upper tray, a sample clamp and a lower tray; according to the size of the target test area of the tested sample, the distance between the upper tray and the lower tray is adjusted by rotating the ball screw, the simulated corrosion solution is added into the test barrel, and the movement of the sample clamp is controlled, so as to realize the control of the corrosion area.

[0011] Compared with the prior art, the present application has the following beneficial effects:

[0012] 1、The present application can realize the accurate control of the corrosion environment temperature, and can also realize the directional corrosion of the middle part of the sample without affecting other areas, and can also adjust the corrosion area through the sample holder according to the needs, so as to realize the accurate control of the corrosion area.

[0013] 2、The present application has multiple modes, realizes one machine with multiple functions, and can comprehensively simulate and reproduce the polar environment in various aspects, which has important significance for the research on the polar marine corrosion.

[0014] 3、The present application can realize the directional corrosion of the target area, and can also realize batch and large-scale corrosion loading.

[0015] 4、The present application has flexible structure, saves test space, is low in cost and high in practicability. DETAILED DESCRIPTION

[0016] Figure 1 It is a structural schematic view of the present application without installing the test box 3;

[0017] Figure 2 It is a front view of the present application;

[0018] Figure 3 It is a top view of the internal structure of the present application;

[0019] Figure 4 It is a structural schematic view of the sample holder 6;

[0020] Figure 5 It is a surface schematic view of the temperature control box;

[0021] Figure 6 It is a structural schematic view of the test barrel 4;

[0022] Figure 7 It is a top view of the slidable box wall plate 3-1 and the silica gel strip;

[0023] Figure 8 It is a comparison of the cumulative electric quantity change of high-strength steel (left) and high-strength aluminum alloy (right) under freeze-thaw environment;

[0024] Figure 9 It is the macroscopic morphology and the morphology after rust removal of three kinds of high-strength steel after one cycle of accelerated environmental spectrum corrosion;

[0025] Figure 10 It is the corrosion rate of three kinds of high-strength steel after one cycle of accelerated corrosion in the indoor accelerated test spectrum environment;

[0026] Figure 11 、 Figure 12 and Figure 13 are the surface micro-morphologies of the corrosion products of 1#, 2# and 3# high-strength steel after one cycle of accelerated environmental spectrum corrosion, respectively.

[0027] Figure 14 、 Figure 15 、 Figure 16 The cross-sectional morphology of corrosion products and EDS surface scanning results of three high-strength steels, 1#, 2# and 3#, after 1 period of accelerated environmental spectrum corrosion are shown in Figures 1, 2 and 3, respectively.

[0028] The drawing marks are as follows: seawater tank 1; workbench 2; test tank 3; slidable tank wall plate 3-1; temperature display screen 3-2; temperature controller button 3-3; electric control switch 3-4; test barrel 4; solution pipe 5; sample rack 6; ball screw 6-1; upper tray 6-2; sample clamp 6-3; lower tray 6-4; temperature sensor 7; ultraviolet light 8; retainer 9; cold air tank 10; fan 11; cold air pipe 12; refrigerator 13. DETAILED DESCRIPTION

[0029] The application will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the application, but do not limit the application in any form. It should be pointed out that those skilled in the art can make several changes and improvements without departing from the concept of the application. These all belong to the protection scope of the application.

[0030] Example 1

[0031] As Figure 1 、 Figure 2The polar ocean corrosion environment simulation system shown in the figure, the system comprises a test box 3, a workbench 2, a cold air box 10, a fan 11, a refrigerator 13, a seawater tank 1, a solution pipe 5, a cold air pipe 12, a test barrel 4, a holder 9, a sample holder 6 and a temperature control system; wherein the test barrel 4 is used to contain the simulated corrosion solution (artificially simulated seawater solution) required, the test barrel 4 is installed in the test box 3 and is embeddedly installed on the workbench 2, the test box 3 mainly plays a role of protecting the test barrel 4 and insulating the environment, which is mainly to maintain the stability of the temperature when simulating the polar ocean environment, the test box 3 and the cold air box 10 are installed on the workbench 2, the refrigerator 13 and the seawater tank 1 are placed under the workbench, the workbench 2 mainly plays a supporting role, the refrigerator 13 and the seawater tank 1 are connected with the cold air box 10 and the test barrel 4 through pipes to complete the work of conveying cold air and simulating corrosion solution, the fan 11 is installed on the left box wall of the cold air box 10 and is opposite to the air outlet of the right box wall, air exchange in the two box bodies is realized through the rotation of the fan 11 to realize the function of cooling, the iceberg mode and the freeze-thaw mode of the system are mainly realized by the refrigerator 13 and the temperature control system, the temperature parameters are input in advance in the temperature control system, the working time of the refrigerator 13 is controlled, the temperature of the solution in the test barrel 4 is reduced, the effect of freezing or freeze-thaw is achieved, and the state of the polar ocean environment is simulated. The sample holder 6 is installed on the ball screw 6-1 and can move up and down to realize the simulation corrosion experiment of different regions of the sample. The sample holder 6 is composed of two parts, and the interval length between the two parts is adjustable, so that the corrosion test of the target experimental region of the test sample with different thickness and different length can be realized, the structure is flexible, the test efficiency is high, the test space is saved, and the practicality is strong.

[0032] The sample holder 6 can be installed with one or more sample clamps 6-3, when a plurality of sample clamps 6-3 are installed, a plurality of experiments can be carried out at the same time, and the experimental time and cost are saved.

[0033] Specifically, the test sample includes various magnesium-aluminum alloys and various low-alloy steels.

[0034] As shown in Figure 6 The bottom surface of the slidable box wall plate 3-1 is provided with an arc-shaped groove, and a silica gel strip is arranged in the arc-shaped groove. The cooperation of the arc-shaped groove and the silica gel strip can eliminate the corners and ensure good sealing to prevent cold air leakage.

[0035] Specifically, the temperature control system can control the temperature in the test box 3 to be constant according to the target temperature. When the temperature in the test box 3 is lower than the target temperature, the temperature control system automatically heats the test box 3. When the temperature in the test box 3 reaches the target temperature, the temperature control system automatically stops heating the test box 3.

[0036] In a preferred embodiment, the temperature control system includes a control unit, an ultraviolet lamp 8, and a temperature sensor 7; the control unit is installed outside the test chamber 3; the ultraviolet lamp 8 and the temperature sensor 7 are both installed inside the test chamber 3; the temperature sensor 7 can transmit the detected temperature information to the control unit, and the control unit selects to start the ultraviolet lamp 8 for heating or the cooler 13 for cooling based on the received temperature information.

[0037] Specifically, such as Figure 4 As shown, multiple sample clamps 6-3 are circumferentially mounted on the sample holder 6, which clamp and position the sample through pre-reserved clamping holes and set screws.

[0038] Specifically, such as Figure 3 As shown, a control box is installed on the outside of the test chamber 3; from top to bottom, the control box is equipped with a temperature display screen 3-2, a temperature controller button 3-3, and an electric control switch 3-4; the control unit is installed inside the control box; the electric control switch 3-4 controls the power on or off of the temperature controller button 3-3 and the temperature display screen 3-2 respectively; the target temperature can be set by operating the temperature controller button 3-3; the temperature display screen 3-2 can display the temperature inside the test chamber 3.

[0039] The working principle of this invention is as follows:

[0040] First, select the specific environmental simulation mode according to the experimental requirements. After selection, wait 2 to 4 hours for the system to complete the environmental simulation. Then, based on the size of the target test area of ​​the sample, adjust the distance between the upper tray 6-2 and the lower tray 6-4 by rotating the ball screw 6-1. Add the prepared simulated corrosion solution into the test tank 4 through the water inlet pipe. Observe the scale inside the test tank 4 until the simulated corrosion solution reaches the required position. Precisely control the movement of the sample holder 6 through the control system to achieve control of the corrosion area. The environmental simulation process is mainly as follows: turn on the electrical control switch 3-4 and set the target temperature through the temperature controller button 3-3.

[0041] The system has four simulation modes: (1) illumination mode, (2) ice floe mode, (3) ocean current mode, and (4) freeze-thaw mode.

[0042] (1) Illumination Mode: When the illumination mode is selected, the UV lamp 8 starts working under the control of the control unit via the control system. The illumination is mainly provided by the UV lamp 8, and the illumination duration depends on the specific experimental parameters, simulating long-term illumination or no-illumination conditions in polar and marine regions. The temperature controller button 3-3 and the temperature sensor 7 are connected, and the temperature in the test chamber 3 is displayed in real time on the temperature display screen 3-2. When the required illumination duration for the experiment is reached, the UV lamp 8 stops working.

[0043] The irradiation time depends on the irradiation intensity on the surface of the test piece in the test chamber and the amount of irradiation received by an exposed period in the real environment. The conventional solar radiation test intensity is the same as the CASS spectrum, that is, the irradiation intensity W=(60±10) W / m 2 When the irradiation intensity of the test chamber is 60 W / m 2 , the total annual irradiation QT=306.45 MJ / m 2 in the total spectrum of the use environment is used, the irradiation time required for each test period is:

[0044]

[0045] According to the total annual irradiation intensity of Zhongshan Station in Antarctica, which is 214.7 MJ / m 2 , we have:

[0046]

[0047] That is, the action time of the irradiation experiment is 41 days.

[0048] (2) Ice floe mode:

[0049] Low-temperature freezing test environment condition: Due to slow corrosion in the low-temperature process, the low-temperature process has a relatively slight effect on electrochemical corrosion. However, the influence of the low-temperature process on material damage needs to be reproduced in the polar environment: first, research shows that there is still an electrochemical process at low temperature; second, the low-temperature process will affect the expansion of the corrosion front medium and the corrosion condition in the subsequent melting process; third, the low temperature has a certain effect on the mechanical properties. Therefore, the polar environment accelerated test environment spectrum retains the ice floe mode.

[0050] When the ice floe mode is selected, the refrigerators 13 and the fans 11 in the cold air tank 10 start to work under the control of the control unit through the control system, the specific working intensity of the refrigerators and the fans is determined according to the required parameters of the experiment, the cold air directly contacts the simulated corrosion solution in the test barrel through the blowing of the fans, the effect of rapid cooling is achieved, the simulated corrosion solution produces ice floes, the time required for environment simulation is greatly reduced, the experimental period is shortened, and in addition, the ice breaking rod in the test barrel can effectively prevent the occurrence of large-scale icing phenomenon in the test barrel.

[0051] This embodiment takes Zhongshan Station as an example, and the temperature range in which the corrosion of the Zhongshan Station environment task is very slow is lower than-10℃. The temperature spectrum result shows that the annual minimum temperature of Zhongshan Station is about-40℃. In order to fully reflect the influence of low temperature, -40℃ is selected as the low-temperature test environment in the accelerated spectrum, and the low-temperature freezing time of the indoor ice freezing is selected as the total number of days of-30 to-40℃ in the actual statistical temperature annual spectrum of Zhongshan Station:

[0052] t 冰冻=1+5=6(d)

[0053] Since the promotion of corrosion in the range of-10~ -20℃ can be ignored, and the effect of low temperature is weaker than-40℃, therefore this-40℃ low temperature freezing acceleration mode of the spectrum of this accelerated test can not only amplify the effect of low temperature, but also accelerate the time to meet the acceleration requirements of material damage failure.

[0054] By the equivalent conversion of the polar atmospheric environment spectrum and the accelerated corrosion environment spectrum, the equivalent acceleration relationship is:

[0055] t 合金钢 =3(d)+5(d)+5(d)+6(d)+=19(d)

[0056] t 铝合金 =3(d)+4(d)+4(d)+6(d)=17(d)

[0057] (3) Ocean current mode: when the ocean current mode is selected, according to the specific experimental parameters, the rotation speed of the test barrel is selected by the control system, if the Antarctic circum polar current is simulated, a 4-pole motor (the number of magnetic poles p = 2) can be selected, then the synchronous speed n = (60 x 50) / 2 = 1500 r / min. If the North Atlantic cold current is simulated, the rotation speed can be appropriately reduced on the basis of the above, such as using a 6-pole motor (the number of magnetic poles p = 3), the synchronous speed n = (60 x 50) / 3 = 1000 r / min.

[0058] By the rotation of the test barrel, the simulated corrosion solution generates vortex, and then the submarine ocean current phenomenon under the polar marine environment is completed in the barrel.

[0059] (4) Freeze-thaw mode

[0060] The freeze-thaw conversion process is carried out once a day in the summer of Antarctica, after 6h of corrosion at-5℃, the temperature is raised to 5℃ for 18h of corrosion, and the corrosion current change is recorded within 24h. The laboratory acceleration condition is 2h of corrosion at-10℃, and then the temperature is raised to 10℃ for 2h of corrosion (as shown in Figure 8 ). The summer freeze-thaw day temperature of Zhongshan Station is mainly-5℃~ 5℃, the liquid film-ice layer of the sample surface corrosion medium changes, and the rust layer may have a deterioration behavior. The test sets every 4h as a freeze-thaw cycle, after 2h of low temperature freezing at-10℃, the temperature is raised to 10℃ for 2h of heat preservation.

[0061] The average freeze-thaw days of Zhongshan Station is 30 days. It is considered that only one freeze-thaw process occurs within 24 hours, and one accelerated freeze-thaw cycle includes a 2h-10℃ temperature interval and a 2h 10℃ temperature interval. The corrosion electric quantity in one accelerated freeze-thaw cycle is equivalent to the cumulative electric quantity in one day of simulated Antarctic freeze-thaw. Therefore, when the accelerated freeze-thaw condition is -10℃ freezing for 2h and then warming to 10℃ for 2h, the number of accelerated freeze-thaw for each test cycle is 30 times, and the total freeze-thaw time t is:

[0062] High-strength steel: t 冻融 =(2+2)×30 / 24=5(d)

[0063] Aluminum alloy: t 冻融 =(1.5+1.5)×30 / 24≈4(d)

[0064] When the freeze-thaw mode is selected, according to the specific experimental parameters, the freeze-thaw temperature range and the number of freeze-thaw are selected through the temperature control system, and the freeze-thaw cycle simulation of the polar marine environment is completed through the cyclic work of the refrigerator and the ultraviolet lamp.

[0065] When the system is working, the ultraviolet lamp 8 will stop heating when the target temperature in the test box is reached, and the ultraviolet lamp 8 will enter the temperature holding mode. When the temperature is too high, the refrigerator 13 starts to work to reduce the temperature in the test box 3 to the target temperature. The temperature control system realizes real-time control of the temperature through the cooperation of the temperature controller button 3-3, the temperature sensor 7, the ultraviolet lamp 8 and the refrigerator 13.

[0066] Example 2

[0067] Based on the accelerated test spectrum constructed in the laboratory, indoor accelerated tests were carried out on three kinds of high-strength steels. Among them, 1#, 2# and 3# are alloy steels with different strengths. The test process refers to the "Polar Environment Accelerated Test Environment Spectrum Applicability Verification Test Test Outline", and the corrosion weight loss, corrosion rate, corrosion product and corrosion morphology after accelerated corrosion are analyzed.

[0068] The results of the accelerated corrosion of 1#, 2# and 3# high-strength steels in the indoor accelerated test spectrum environment were analyzed. Figure 9 The macroscopic morphology (a-c) and the morphology after rust removal (d-f) of 1# (a, d), 2# (b, e) and 3# (c, f) high-strength steels after one cycle of accelerated environment spectrum corrosion. The corrosion product of the three steels is reddish brown, and the peeled rust layer is greenish, indicating that the external rust layer is mainly composed of corrosion products of iron ions, and the internal rust layer is the product of ferrous ions. After rust removal, the surface of 1# steel and 2# steel is more uneven, with obvious etch pits, and the surface of 3# steel after corrosion is more uniform.

[0069] Figure 10The corrosion rate of three high-strength steels after 1 period of accelerated corrosion in the indoor accelerated test spectrum environment. Since 1 period of environmental spectrum acceleration is equivalent to 1 year outdoors, the corrosion rate unit is unified from μm / period to μm / year. As can be seen from the results in the figure, the corrosion rate of 1# steel after 1 period of accelerated corrosion is about 11.30 μm / period (μm / year). The corrosion rates of 2# and 3# steels are relatively high, being 15.02 and 15.49 μm / period (μm / year), respectively.

[0070] Figure 11 、 Figure 12 and Figure 13 are the surface micro-morphologies of the corrosion products of 1#, 2# and 3# high-strength steels after 1 period of accelerated environmental spectrum corrosion, and Table 4-1 is the EDS results at different positions. The surface corrosion products of 1# steel are mainly cluster-shaped γ-FeOOH and more compact hemispherical α-FeOOH. The EDS results show that there is a lot of Ni element in the rust layer at P1. The surface corrosion products of 2# steel are similar to those of 1# steel, consisting of hemispherical α-FeOOH and cluster-shaped γ-FeOOH. The rust layer has obvious stratification, and the outer layer is loose. The absence of Ni element in the EDS results indicates that there is no Ni element enrichment zone in the outer loose rust layer. The corrosion product layer of 3# steel is obviously looser, and the corrosion products have stratification and peeling. The corrosion products consist of loose γ-FeOOH phase (P5 position) and needle-shaped β-FeOOH phase (P6 position). The main elements in the rust layer are Fe, O and C, and no alloy element that can improve the protection of the rust layer is detected. Figure 14 、 Figure 15 、 Figure 16 are the cross-sectional morphologies of the corrosion products of 1#, 2# and 3# high-strength steels after 1 period of accelerated environmental spectrum corrosion and their EDS area scanning results. The rust layer thickness of the three materials is about 40 μm. The outer rust layer of 1# steel is loose, and the inner rust layer is more compact, but there are cracks at the junction with the matrix. The EDS results show that the Ni content in the inner rust layer is significantly higher than that in the outer rust layer. The rust layer of 2# steel is tightly bonded to the matrix, but the rust layer thickness is uneven, and the rust layer also has cracking. The rust layer of 3# steel has obvious cracks and cavities, and the rust layer structure is easily damaged, which is consistent with the result that the corrosion rate of 3# steel is relatively fast. Summarizing the surface corrosion product morphologies and EDS results of the three high-strength steels, it can be found that the corrosion product layer of 1# steel contains more Ni element, and its protection is better, which is consistent with the corrosion rate results.

[0071] Table 1 EDS test results of corrosion products of three high-strength steels at different positions

[0072]

[0073]

[0074] In the description of the present application, it needs to be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the systems or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0075] The specific embodiments of the present application are described above. It needs to be understood that the present application is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essential content of the present application. The embodiments of the present application and the features in the embodiments can be arbitrarily combined without conflict.

Claims

1. A polar marine corrosion environment simulation system characterized by, Including test box, cold box, refrigerator and temperature control system, the test box is provided with test barrel, the temperature control system includes control unit and purple light lamp; The polar marine corrosion environment simulation system is provided with illumination mode, ice mode, ocean current mode and freeze-thaw mode; When the illumination mode is selected, the control unit controls the purple light lamp to increase illumination, simulating the long-time illumination or no-illumination state of the polar marine area; When the ice mode is selected, the control unit controls the refrigerator and the cold box to start working, rapidly cooling, so that the simulated corrosion solution in the test barrel generates ice; When the ocean current mode is selected, the control unit controls the rotating speed of the test barrel, simulating the submarine ocean current under the polar marine environment; if the Antarctic circum-polar current is simulated, a 4-pole motor is selected, and if the North Polar Ocean cold current is simulated, a 6-pole motor is selected; When the freeze-thaw mode is selected, the temperature control system selects the freeze-thaw temperature range and the freeze-thaw times, and the control unit controls the refrigerator and the purple light lamp to work cyclically, so as to simulate the freeze-thaw cycle of the polar marine environment by selecting the freeze-thaw temperature range and the freeze-thaw times.

2. The polar marine corrosion environment simulation system of claim 1, wherein, The test barrel is provided with a plurality of ice-breaking rods which are installed on the bottom of the test barrel in a circumferential direction; the ice-breaking rods and the test barrel rotate to make the solution surface generate ice.

3. The polar marine corrosion environment simulation system of claim 1, wherein, The polar marine corrosion environment simulation system further comprises a seawater tank, a workbench, a solution pipe and a cold gas pipe; the test box and the cold box are installed on the workbench; the seawater tank and the refrigerator are installed under the workbench; the refrigerator and the seawater tank are connected with the test barrel through the solution pipe to transport the simulated corrosion solution; and the refrigerator is connected with the cold box through the cold gas pipe to transport cold gas.

4. The polar marine corrosion environment simulation system of claim 1, wherein, The polar marine corrosion environment simulation system is in a closed state, the illumination is provided by the purple light lamp in the temperature control system, and the polar day and night phenomenon in the polar area is simulated by controlling the working time of the purple light lamp.

5. The polar marine corrosion environment simulation system of claim 1, wherein, The test box is provided with a temperature sensor; the temperature sensor transmits the detected temperature information to the control unit, and the control unit selects to start the purple light lamp or the refrigerator according to the received temperature information.

6. The polar marine corrosion environment simulation system of claim 1, wherein, The polar marine corrosion environment simulation system comprises a sample holder which comprises a ball screw, an upper tray, a sample clamp and a lower tray; according to the size of the target test area of the tested sample, the distance between the upper tray and the lower tray is adjusted by rotating the ball screw, the simulated corrosion solution is added into the test barrel, and the movement of the sample clamp is controlled, so as to control the corrosion area.

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