A water environment control system for erosion corrosion, a test device and a test method

Abstract

The application provides a water environment control system for erosion corrosion, a test device and a test method, and particularly relates to the technical field of material corrosion testing. The water environment control system for erosion corrosion comprises a sealed cylinder, a sealing cover, a rotating mechanism and a cooling system. The sealed cylinder is internally provided with a flowing medium and a rotating disc immersed in the flowing medium, and the sealing cover is arranged at the opening end of the sealed cylinder. The rotating mechanism is connected with the rotating disc and drives the rotating disc to rotate. The cooling system is used for adjusting the temperature of the flowing medium in the sealed cylinder, wherein the cooling system comprises a heat exchanger, a circulating pump, a first heat exchange pipeline and a second heat exchange pipeline. One end of the first heat exchange pipeline is immersed in the flowing medium, and the other end is connected with the heat exchanger through the circulating pump. One end of the second heat exchange pipeline is connected with the heat exchanger, and the other end enters the sealed cylinder from the bottom of the sealed cylinder. The cooling system can cool the flowing medium through circulating heat exchange, so as to prevent the flowing medium from being affected by the temperature rise.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of material corrosion testing, and particularly relates to a water environment control system for erosion corrosion, a test device and a testing method. BACKGROUND

[0002] Erosion corrosion is a phenomenon of material damage caused by high-speed relative motion between the surface of a material and a medium. In the industrial fields of energy and power, petroleum and chemical industry, shipbuilding and marine engineering, various rotating parts such as pumps and stirring paddles, or other flow parts often bear severe liquid phase or liquid / solid two-phase erosion corrosion, and the interaction law between erosion and corrosion is the core content of exploring the erosion corrosion mechanism. To obtain the weight loss of the parts caused by the interaction, the corrosion weight loss component (obtained from dynamic polarization data) and the pure erosion weight loss component (dynamic weight loss rate under cathodic protection conditions) in the erosion corrosion process need to be measured. Realizing electrochemical testing in liquid phase / (liquid / solid two-phase) is one of the keys to studying the erosion corrosion interaction, and dynamic electrochemical information plays a crucial role in revealing the erosion corrosion mechanism.

[0003] As for dynamic electrochemical testing, there are currently three methods: rotation method, jet method and pipe flow method. Among them, the sample is fixed during the test in the jet method and the pipe flow method, and electrochemical testing is easy to realize, but it cannot simulate the erosion corrosion process of rotating parts. The rotation method is suitable for simulating the erosion corrosion behavior of rotating parts such as pump impellers and stirring paddles, but it is difficult to perform electrochemical testing because the sample remains in a rotating state during the test.

[0004] In addition, factors such as oxygen content and temperature have a significant impact on the detection of dynamic electrochemical information. The existing rotating erosion corrosion test device has the following problems: the water flow is stirred and impacted in a limited space, generating heat, especially when the rotation speed exceeds 10 m / s, the water temperature will rise rapidly, and even reach about 50℃. At the same time, a vortex is stirred in the center of the test area, a large amount of oxygen enters the flowing medium, and more seriously, the sample is directly exposed to the air. Moreover, most of the sediment in the medium will settle at the bottom of the test area around the four sides. These situations will seriously affect the electrochemical measurement results.

[0005] Therefore, it is urgent to develop a water environment control system for erosion corrosion, a test device and a testing method to improve the above problems. SUMMARY

[0006] In view of the problems existing in the prior art, the present application provides a water environment control system for erosion corrosion, a test device and a testing method, which are used in a rotating erosion corrosion test device to improve the problems of temperature rise, oxygen dissolution and sediment settlement of the flowing medium.

[0007] To achieve the above object and other related objects, the present application provides a water environment control system for erosion, comprising a sealed cylinder, a sealed cover, a rotating mechanism and a cooling system, the inside of the sealed cylinder is provided with a flow medium and a rotating disc immersed in the flow medium, the sealed cover is arranged at the opening end of the sealed cylinder; the rotating mechanism is connected with the rotating disc and drives the rotating disc to rotate; the cooling system is used for adjusting the temperature of the flow medium in the sealed cylinder, wherein the cooling system comprises a heat exchanger, a circulating pump, a first heat exchange pipeline and a second heat exchange pipeline, one end of the first heat exchange pipeline is immersed in the flow medium through the sealed cover, the other end is connected with the heat exchanger through the circulating pump, one end of the second heat exchange pipeline is connected with the heat exchanger, and the other end enters the sealed cylinder from the bottom of the sealed cylinder.

[0008] In an embodiment of the present application, the second heat exchange pipeline comprises a main pipeline, a first branch pipeline, a second branch pipeline and a converging pipeline, one end of the main pipeline is connected with the heat exchanger, the other end is divided into the first branch pipeline and the second branch pipeline before entering the sealed cylinder, the first branch pipeline and the second branch pipeline both pass through the bottom of the sealed cylinder, the converging pipeline is arranged inside the sealed cylinder and communicates with the first branch pipeline and the second branch pipeline, and a plurality of water inlet holes are arranged on the converging pipeline.

[0009] In an embodiment of the present application, the cooling system further comprises a temperature detection device and a temperature adjusting device, the detection end of the temperature detection device extends into the flow medium and is used for detecting the temperature of the flow medium, and the temperature adjusting device is arranged outside the sealed cylinder and communicates with the heat exchanger.

[0010] In an embodiment of the present application, the rotating mechanism comprises a brushless servo motor and a hollow connecting rod, one end of the hollow connecting rod is connected with the output end of the brushless servo motor, and the other end is connected with the rotating disc.

[0011] In an embodiment of the present application, the sealed cover is provided with a mounting hole through which the hollow connecting rod passes, and a magnetic force sealing coupling is arranged between the hollow connecting rod and the mounting hole.

[0012] In an embodiment of the present application, the inner wall of the sealed cylinder is provided with a wave reduction and damping device, the wave reduction and damping device comprises a damping body and a damping block, the damping body is provided with a containing cavity accommodating the damping block, and the side of the damping body facing the flow medium is provided with a through hole communicating with the containing cavity.

[0013] In an embodiment of the present application, the material of the sealed cylinder is glass fiber reinforced polyether ether ketone, the material of the sealed cover is metal material, and the sealed cover is provided with a visual window.

[0014] In an embodiment of the present application, the water environment control system for erosion corrosion further comprises a flow rate sensor and / or a dissolved oxygen sensor, the flow rate sensor is installed on the sealing cover and the detection end of the flow rate sensor extends into the flowing medium, and the dissolved oxygen sensor is installed on the sealing cover and the detection end of the flow rate sensor extends into the flowing medium.

[0015] The second aspect of the present application provides a device for erosion corrosion test, which comprises an electrochemical workstation, an electrode assembly and the water environment control system for erosion corrosion described above, the electrode assembly is installed on the sealing cover of the water environment control system for erosion corrosion and is electrically connected with the electrochemical workstation.

[0016] The third aspect of the present application provides a method for erosion corrosion test, which is based on the device for erosion corrosion test described above to perform corrosion test, and the method comprises the following steps:

[0017] Injecting the flowing medium for test into the sealed cylinder;

[0018] Installing the sample to be tested on the rotating disc in the sealed cylinder and electrically connecting with the electrochemical workstation;

[0019] Installing the electrode assembly on the sealing cover and electrically connecting with the electrochemical workstation;

[0020] Sealingly connecting the sealing cover with the sealed cylinder;

[0021] Setting test parameters, starting electrochemical test after the flow rate and temperature of the flowing medium are stable, and recording test data.

[0022] The water environment control system for erosion corrosion provided by the present application sets a cooling system outside the sealed cylinder, and the circulating pump of the cooling system can draw the flowing medium in the sealed cylinder into the heat exchanger, and the flowing medium is heated in the heat exchanger and then enters the sealed cylinder from the bottom, so that the problem of temperature rise of the flowing medium due to agitation and impact during the test is avoided, and the influence of temperature change on the electrochemical test result is effectively prevented. Moreover, the heated flowing medium enters from the bottom of the sealed cylinder, which can drive the bottom sediment to move upward, so that the sediment is relatively uniformly distributed in the flowing medium, and the sediment is prevented from settling around the bottom.

[0023] In addition, a plurality of water inlet holes are arranged on the convergence pipe of the heat exchange pipeline entering the bottom of the sealed cylinder, and the heated flowing medium is sprayed into the sealed cylinder through the water inlet holes, which can improve the spraying pressure, and part of the high-pressure water flow can impact the sediment deposited on the bottom, so that the sediment deposited on the bottom flows to the upper part of the sealed cylinder, thereby making the sediment more uniformly distributed in the flowing medium.

[0024] The application sets a wave reduction and wave elimination device on the inner wall of the sealed cylinder, which can eliminate the disturbance of the rotating mechanism in the central area and the echo formed after the impact of the cylinder side wall, and affect the accuracy of the test flow rate. The cylinder body of the sealed cylinder adopts glass fiber reinforced polyether ether ketone material, which can ensure strength while achieving electrical insulation, and the abrasive particles formed by scouring are non-conductive. The metal sealing cover with tempered glass window can ensure that the medium in the sealed cylinder does not flow out of the sealed cylinder due to the high-speed rotation of the rotating disc, and prevents external air from entering the sealed cylinder. The metal sealing cover also has an electromagnetic shielding effect on the motor. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other embodiments can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0026] Figure 1 The structural schematic diagram of the water environment control system for erosion corrosion in an embodiment of the present application is shown in the figure.

[0027] Figure 2 The structural schematic diagram of the backflow pipe in an embodiment of the water environment control system for erosion corrosion is shown in the figure.

[0028] Figure 3 The structural schematic diagram of the wave reduction and wave elimination device in an embodiment of the water environment control system for erosion corrosion is shown in the figure.

[0029] Figure 4 The structural schematic diagram of the water environment control system for erosion corrosion in another embodiment of the present application is shown in the figure.

[0030] Figure 5 The structural schematic diagram of the erosion corrosion test device in an embodiment of the present application is shown in the figure.

[0031] Figure 6 The flow chart of the test method of the erosion corrosion test of the present application is shown in the figure.

[0032] Element number explanation:

[0033] 100, sealed cylinder; 101, rotary disc; 102, sample; 103, wave breaker; 1031, wave breaking block; 1032, through hole; 110, sealing cover; 111, visual window; 120, rotating mechanism; 121, brushless servo motor; 122, hollow connecting rod; 123, magnetic force sealing coupling; 130, cooling system; 131, heat exchanger; 132, circulating pump; 133, first heat exchange pipeline; 134, second heat exchange pipeline; 1341, main pipeline; 1342, first branch pipeline; 1343, second branch pipeline; 1344, confluence pipeline; 1345, water inlet hole; 135, control valve; 136, temperature detection device; 137, temperature adjusting device; 1371, connecting pipeline; 140, flow rate sensor; 150, dissolved oxygen sensor; 160, oxygen cylinder; 200, electrochemical workstation; 210, reference electrode; 220, auxiliary electrode; 230, wire. DETAILED DESCRIPTION

[0034] The present application is herein described, by way of example only, with reference to embodiments thereof. It is to be understood that variations and modifications of the embodiments can be made while remaining within the spirit and scope of the present application. The embodiments and features of the present application as described herein can be combined with one another in any manner within the scope of the application. Additionally, it is contemplated that each feature described herein can be implemented by corresponding means to achieve the same function, irrespective of the structure chosen to implement the means. It is therefore contemplated to cover any and all modifications and variations of this application covered by the scope of the appended claims. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present application which is defined by the appended claims.

[0035] When a numerical range is given in the embodiments, it is understood that, unless otherwise specified by the present application, each numerical range has two endpoints and any number between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the present application are used in the same manner as those skilled in the art of the present technology and as described in the present application. Any method, equipment and material of the prior art similar or equivalent to the method, equipment and material of the embodiments of the present application can also be used to implement the present application.

[0036] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the specification are only for the convenience of clear description, and are not intended to limit the scope of the present application, and the change or adjustment of the relative relationship without substantial change of the technical content is also regarded as the scope of the present application.

[0037] Please refer to Figures 1 to 6The application provides a water environment control system for erosion corrosion, an erosion corrosion test device comprising the water environment control system and a test method using the erosion corrosion test device. The cooling system is arranged outside the sealed cylinder, and the circulating pump of the cooling system is used to draw part of the flow medium in the sealed cylinder into the heat exchanger, and then the flow medium is introduced into the sealed cylinder from the bottom after heat exchange, so that the problem of temperature rise of the flow medium due to agitation impact during the test process is avoided, and the influence of temperature change on the electrochemical test result is effectively prevented.

[0038] Referring to Figure 1 The first aspect of the application provides a water environment control system for erosion corrosion, which is used for controlling the water environment during the erosion corrosion test process and preventing adverse effects of test environment changes on test results.

[0039] The water environment control system for erosion corrosion comprises a sealed cylinder 100, a sealed cover 110, a rotating mechanism 120 and a cooling system 130, wherein the sealed cylinder 100 is an erosion corrosion test area, the inside of the sealed cylinder 100 is provided with a flow medium, the sealed cover 110 is in sealed connection with the sealed cylinder 100, the sealed cover 110 is used for preventing external air from continuously entering the sealed cylinder 100, the rotating mechanism 120 is used for driving a test sample 102 to rotate, so as to simulate the erosion corrosion behavior of rotating parts such as pump impellers and stirring paddles, and the cooling system 130 is used for cooling the flow medium in the sealed cylinder 100, so as to prevent the flow medium from being agitated and impacted in a limited space, heat is generated to cause temperature rise, and the measurement result is affected.

[0040] Referring to Figure 1 The sealed cylinder 100 is used as a test area for erosion corrosion test, and the structure thereof is not limited, and can be any cavity structure capable of accommodating test medium, test sample, test assembly and the like, for example, can be a cylindrical structure, a square cylindrical structure or the like. In an embodiment, the sealed cylinder 100 is a cylindrical structure, one end of the cylindrical structure is a closed end, and the other end is an open end. The cylinder body of the sealed cylinder 100 needs to have a certain strength, and also needs to be electrically insulated, so that the abrasive particles formed by erosion are not conductive. In the embodiment, the cylinder body of the sealed cylinder 100 is made of glass fiber reinforced polyether ether ketone (PEEK) material, and the composite material has good high temperature resistance, chemical corrosion resistance and excellent mechanical properties. The sealed cylinder 100 is provided with a flow medium (not shown in the figure) for test, and the type of the flow medium can be selected according to the specific test, for example, seawater, electrolyte water containing various atmospheres and silt or the like. The sealed cylinder 100 is also provided with a rotating disc 101, the rotating disc 101 is immersed in the flow medium, is used for mounting the test sample 102, and the rotating disc 101 can drive the test sample 102 to rotate under the driving of the rotating mechanism 120, so as to simulate the erosion corrosion behavior of rotating parts such as pump impellers and stirring paddles.

[0041] Referring to Figure 1The sealing cover 110 is arranged at the opening end of the sealing cylinder 100 to completely seal the sealing cylinder 100 and prevent external air from entering the inside of the sealing cylinder 100. The sealing cover 110 and the sealing cylinder 100 can be connected by any fixing mode such as thread or bolt. In an embodiment, the opening end of the sealing cylinder 100 is provided with an outer edge extending radially outward, the sealing cover 110 includes a cover body and a sealing part protruding from the cover body, the diameter of the sealing part matches the inner diameter of the sealing cylinder 100, and the diameter of the cover body is larger than that of the sealing part. During installation, the sealing part is embedded in the inside of the sealing cylinder 100, the cover body is matched with the outer edge of the sealing cylinder 100, and is fixed by bolts. Further, the contact end of the sealing part and the sealing cylinder 100 is provided with an arc-shaped chamfer, which can further improve the sealing effect.

[0042] In an embodiment, the sealing cover 110 adopts a cover body made of metal material, which can play a role of electromagnetic shielding. Further, the sealing cover 110 is provided with a visual window 111, through which the test condition inside the sealing cylinder 100 can be observed. The visual window 111 is formed by arranging an opening on the sealing cover 110 and sealing the opening by tempered glass. The tempered glass can be fixed on the sealing cover 110 or can be detachably installed on the sealing cover 110, etc.

[0043] Please refer to Figure 1The rotating mechanism 120 is connected with the rotating disc 101 and drives the rotating disc 101 to rotate. In an embodiment, the rotating mechanism 120 comprises a brushless servo motor 121 and a hollow connecting rod 122. The brushless servo motor 121 is arranged outside the sealed cylinder 100 and is fixed by a support (not shown in the figure). One end of the hollow connecting rod 122 is connected with the output end of the brushless servo motor 121, and the other end penetrates the sealing cover 110 into the sealed cylinder 100 and is fixedly connected with the rotating disc 101. Starting the brushless servo motor 121 can drive the hollow connecting rod 122 to rotate, thereby driving the rotating disc 101 to rotate. In this embodiment, the brushless servo motor 121 is used as the driving motor, which can avoid the graphite carbon powder of the brush motor from entering the sealed cylinder 100 and adhering to the sample 102, thereby affecting the test results. The hollow connecting rod 122 is used for transmission because the hollow connecting rod 122 is hollow inside, which is convenient for arranging wires inside to electrically connect the sample 102 fixed on the rotating disc 101 with the electrochemical workstation. In this way, the problem that the wires are wound during the rotation of the hollow connecting rod 122 and the rotating disc 101 and affect the test can be avoided. Further, the hollow connecting rod 122 is sealed and rotated by the magnetic sealing coupling 123 at the sealing cover 110. Specifically, the sealing cover 110 is provided with a mounting hole through which the hollow connecting rod 122 penetrates, and the mounting hole is provided with the magnetic sealing coupling 123. The hollow connecting rod 122 penetrates the magnetic sealing coupling 123 into the sealed cylinder 100 and is connected with the rotating disc 101. The magnetic sealing coupling 123 can completely seal the sealed cylinder 100, so as to prevent the particles in the outside environment or the abrasive particles formed by erosion from entering the sealed cylinder 100 and affecting the test results.

[0044] Please refer to Figure 1The cooling system 130 is used to adjust the temperature of the flowing medium in the sealed cylinder 100. The cooling system 130 in the application comprises a heat exchanger 131, a circulating pump 132, a first heat exchange pipeline 133 and a second heat exchange pipeline 134. The heat exchanger 131 is arranged outside the sealed cylinder 100. One end of the first heat exchange pipeline 133 penetrates the sealed cover 110 and enters the sealed cylinder 100, and the end of the first heat exchange pipeline 133 is immersed in the flowing medium. The other end of the first heat exchange pipeline 133 is connected with the heat exchanger 131 through the circulating pump 132. One end of the second heat exchange pipeline 134 is connected with the heat exchanger 131, and the other end enters the sealed cylinder 100 from the bottom of the sealed cylinder 100. During the test, the flowing medium is stirred and impacted in the limited space, and heat is generated. When the rotating speed exceeds 10 m / s, the temperature rises rapidly, and the temperature can even reach about 50℃, which causes the temperature of the flowing medium to rise rapidly. The arrangement of the cooling system 130 can extract the flowing medium in the sealed cylinder 100 through the circulating pump 132 and the first heat exchange pipeline 133, and then the flowing medium enters the heat exchanger 131. After heat exchange in the heat exchanger 131, the flowing medium enters the sealed cylinder 100 from the bottom of the sealed cylinder 100 through the second heat exchange pipeline 134. In this way, the temperature of the flowing medium during the test can be prevented from rising, and the test result can be affected. At the same time, the flowing medium after heat exchange enters the sealed cylinder 100 from the bottom, can impact the silt deposited at the bottom of the sealed cylinder 100, and can make the silt relatively uniformly distributed in the flowing medium instead of being deposited around the bottom of the sealed cylinder 100. Further, the second heat exchange pipeline 134 is further provided with a control valve 135. The amount of the flowing medium entering the sealed cylinder 100 can be adjusted by using the control valve 135, so that the settlement test research of different silt contents can be carried out.

[0045] Please refer to Figure 1 and Figure 2 In an embodiment, the second heat exchange pipeline 134 comprises a main pipeline 1341, a first branch pipeline 1342, a second branch pipeline 1343 and a converging pipeline 1344. One end of the main pipeline 1341 is connected to the heat exchanger 131, and the other end is divided into the first branch pipeline 1342 and the second branch pipeline 1343 before entering the sealed cylinder 100. The first branch pipeline 1342 and the second branch pipeline 1343 penetrate the bottom of the sealed cylinder 100 and converge to the converging pipeline 1344. The converging pipeline 1344 is in the form of a circular ring and is located in the sealed cylinder 100. A plurality of water inlet holes 1345 are uniformly distributed on the converging pipeline 1344 in the circumferential direction. The flowing medium after heat exchange in the heat exchanger 131 enters the main pipeline 1341, converges to the converging pipeline 1344 through the first branch pipeline 1342 and the second branch pipeline 1343, and is sprayed into the sealed cylinder 100 through the water inlet holes 1345 on the converging pipeline 1344. This structure can make the pressure of the flowing medium sprayed greater and the spraying effect stronger, so that the silt settled in the sealed cylinder 100 is more uniformly distributed.

[0046] Please refer to Figure 1 In an embodiment, the cooling system 130 further comprises a temperature detecting device 136, such as a thermometer, which is installed on the sealing cover 110 and has a temperature detecting end extending into the flowing medium inside the sealing cylinder 100 for real-time monitoring of the temperature of the flowing medium.

[0047] Further, the cooling system 130 further comprises a temperature adjusting device 137 which forms a closed loop with the heat exchanger 131 through a connecting pipeline 1371. When it is needed to adjust the temperature of the flowing medium, the flowing medium inside the sealing cylinder 100 is extracted by the circulating pump 132 into the heat exchanger 131, and then the temperature adjusting device 137 is used to adjust the temperature of the flowing medium in the heat exchanger 131 to the required temperature, and then the adjusted flowing medium is introduced into the sealing cylinder 100 through the second heat exchange pipeline 134. In this way, the temperature of the flowing medium can be adjusted, so that the erosion corrosion test at different temperatures can be realized.

[0048] Please refer to Figure 1 and Figure 3 In an embodiment, the inner wall of the sealing cylinder 100 is provided with a wave reduction and wave elimination device which can eliminate the disturbance of the rotating mechanism 120 in the central area of the sealing cylinder 100 and the echo formed after the impact of the side wall of the cylinder body, so as to affect the accuracy of the test flow rate. The wave reduction and wave elimination device can adopt any structure which can eliminate the echo. As an example, the wave reduction and wave elimination device comprises a wave elimination body 103 and wave elimination blocks 1031 filled in the wave elimination body 103. The wave elimination body 103 is a plate-shaped structure with a certain thickness, and is arranged in a circle along the inner wall of the sealing cylinder 100, and has a containing cavity for accommodating the wave elimination blocks 1031 arranged therein. The surface of the wave elimination body 103 is provided with through holes 1032 which are in communication with the containing cavity. The waves formed by the disturbance of the rotating mechanism 120 will be buffered by the wave elimination blocks 1031 filled in the containing cavity after entering the containing cavity through the through holes 1032, so as to realize wave elimination. The wave elimination blocks 1031 can be any shaped blocks, such as cobblestones.

[0049] Please refer to Figure 1 In an embodiment, the erosion corrosion water environment control system further comprises a flow rate sensor 140 which is installed on the sealing cover 110 and has a detecting end extending into the flowing medium inside the sealing cylinder 100 for detecting the flow rate of the flowing medium. The flow rate sensor 140 can be, for example, a liquid vortex flowmeter, a piezoelectric flowmeter, etc.

[0050] Please refer to Figure 1 and Figure 4In an embodiment, the water environment control system for erosion-corrosion further comprises a dissolved oxygen sensor 150, which is installed on the sealing cover 110 and has a probe end immersed in the flowing medium in the sealing cylinder 100 for detecting the amount of dissolved oxygen in the flowing medium. Further, an oxygen cylinder 160 is arranged outside the sealing cylinder 100 and is in communication with the sealing cylinder 100 through a gas pipeline, for example, an air inlet hole is arranged on the sealing cover 110, one end of the gas pipeline is in communication with the oxygen cylinder 160, and the other end is in communication with the air inlet hole on the sealing cover 110. The oxygen cylinder 160 can be used to supplement oxygen in the sealing cylinder 100 to adjust the amount of dissolved oxygen in the flowing medium, thereby realizing test research under different atmospheres.

[0051] Referring to Figure 1 and Figure 5 , the second aspect of the present application provides an erosion-corrosion test device, which comprises the above-mentioned water environment control system for erosion-corrosion, an electrochemical workstation 200, an electrode assembly, and a wire 230. The electrode assembly comprises a reference electrode 210, an auxiliary electrode 220, and a working electrode (a sample 102). The reference electrode 210 and the auxiliary electrode 220 are installed on the sealing cover 110 of the water environment control system and are immersed in the flowing medium inside the sealing cylinder 100. The reference electrode 210 and the auxiliary electrode 220 are respectively electrically connected to the electrochemical workstation 200 through the wire 230. The working electrode (the sample 102) is fixed on the rotating disc 101. The working electrode is electrically connected to the electrochemical workstation 200 through the wire 230, and the wire 230 between the working electrode and the electrochemical workstation 200 passes through the inside of the hollow connecting rod 122.

[0052] The erosion-corrosion test device of the present application can perform erosion-corrosion tests at different temperatures due to the arrangement of the temperature adjusting device 137, so as to study the influence of temperature on the test results.

[0053] The erosion-corrosion test device of the present application can perform erosion-corrosion tests under different atmospheres due to the arrangement of the air inlet hole and the oxygen cylinder 160, so as to study the influence of different atmospheres (oxygen content) on the test results.

[0054] The erosion-corrosion test device of the present application can also control the return amount of the flowing medium after heat exchange through the control valve 135 on the second heat exchange pipeline 134, so as to control the sediment content in the flowing medium, and further study the erosion-corrosion test under different sediment contents.

[0055] Referring to Figure 1 , Figure 5 and Figure 6 , the third aspect of the present application provides a test method based on the above-mentioned erosion-corrosion test device, which comprises the following steps:

[0056] S1, configure the flow medium injection into the sealed cylinder 100;

[0057] S2, install the test sample 102 on the rotating disc 101 in the sealed cylinder 100, and electrically connect with the electrochemical workstation 200;

[0058] S3, install the electrode assembly on the sealed cover 110, and electrically connect with the electrochemical workstation 200;

[0059] S4, seal the sealed cover 110 with the sealed cylinder 100;

[0060] S5, set the test parameters, and start the electrochemical test after the flow rate and temperature of the flow medium are stable, and record the test data.

[0061] The flow medium in step S1 is configured according to the specific test, for example, it can be electrolyte water containing various atmospheres and silt, and the atmosphere and silt content can be configured according to the test requirements. The injection amount of the flow medium in the sealed cylinder 100 can at least submerge the rotating disc 101.

[0062] The test sample 102 in step S2 can use a conventional rotating erosion corrosion test sample. The test sample 102 is installed on the rotating disc 101, and the lead wire 230 is connected with the test sample 102 through the hollow connecting rod 122 of the rotating mechanism 120, and the other end of the lead wire 230 is connected with the working end of the electrochemical workstation 200.

[0063] The electrode assembly in step S3 includes a reference electrode 210 and an auxiliary electrode 220. First, the reference electrode 210 and the auxiliary electrode 220 are installed on the sealed cover 110 respectively, and after the sealed cover 110 is connected with the sealed cylinder 100, the reference electrode 210 and the auxiliary electrode 220 can be immersed in the flow medium in the sealed cylinder 100 and located at a distance above the test sample 102. Then the reference electrode 210 and the auxiliary electrode 220 are connected with the electrochemical workstation 200 through the lead wire 230 respectively.

[0064] Step S4 is to connect the sealed cover 110 with the sealed cylinder 100 to realize the complete sealing of the sealed cylinder 100, so as to prevent the flow medium from jumping out of the sealed cylinder 100 during the test process.

[0065] Step S5 sets test parameters, including test rotation speed, test temperature and dissolved oxygen amount, the test rotation speed can be set through the rotation speed of the brushless servo motor 121 of the rotating mechanism 120, the test temperature can be monitored in real time through the test measuring device 136, the test temperature can be adjusted through the temperature adjusting device 137, the dissolved oxygen amount can be detected through the dissolved oxygen sensor 150, and the dissolved oxygen amount in the flowing medium is adjusted through the oxygen amount in the oxygen cylinder 160 entering the sealed cylinder body 100. After the test parameters are stable, the electrochemical test is started, and the test data is recorded.

[0066] During the test, the cooling system 130 keeps the starting state, the circulating pump 132 draws the flowing medium in the sealed cylinder body 100 into the heat exchanger 131 through the first heat exchange pipeline 133, and after heat exchange in the heat exchanger 131, the flowing medium flows back to the sealed cylinder body 100 through the second heat exchange pipeline 134, so as to prevent the temperature from rising due to agitation and impact of the flowing medium, thereby affecting the test results.

[0067] The water environment control system for erosion corrosion of the application sets a cooling system outside the sealed cylinder body, uses the circulating pump of the cooling system to draw part of the flowing medium in the sealed cylinder body into the heat exchanger, and after heat exchange in the heat exchanger, the flowing medium enters the sealed cylinder body from the bottom, thereby avoiding the problem that the temperature rises due to agitation and impact of the flowing medium during the test, and effectively preventing the influence of temperature change on the electrochemical test results. Moreover, the flowing medium after heat exchange enters from the bottom of the sealed cylinder body, can impact the silt upward, so that the silt is relatively uniformly distributed in the flowing medium, preventing the silt from settling around the bottom and affecting the test results. Therefore, the application effectively overcomes some practical problems in the prior art, thereby having high utilization value and use significance.

[0068] The above embodiments only exemplarily illustrate the principles and effects of the application, and are not used to limit the application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the application should be covered by the claims of the application.

Claims

1. A water environment control system for scouring and corrosion, characterized in that, include: A sealed cylinder, inside which a flowing medium and a rotating disc immersed in the flowing medium are provided; A sealing cap is disposed at the open end of the sealing cylinder; A rotating mechanism is connected to the turntable and drives the turntable to rotate; A cooling system is used to regulate the temperature of the medium flowing inside the sealed cylinder; The cooling system includes a heat exchanger, a circulating pump, a first heat exchange pipe, and a second heat exchange pipe. One end of the first heat exchange pipe is immersed in the flowing medium through the sealing cover, and the other end is connected to the heat exchanger through the circulating pump. One end of the second heat exchange pipe is connected to the heat exchanger, and the other end enters the sealing cylinder from the bottom of the sealing cylinder. The second heat exchange pipeline includes a main pipeline, a first branch pipe, a second branch pipe, and a manifold. One end of the main pipeline is connected to the heat exchanger, and the other end branches out into the first branch pipe and the second branch pipe before entering the sealing cylinder. Both the first branch pipe and the second branch pipe pass through the bottom of the sealing cylinder. The manifold is located inside the sealing cylinder and communicates with the first branch pipe and the second branch pipe. The manifold is provided with multiple water inlet holes. The inner wall of the sealed cylinder is provided with a wave-damping and wave-dissipating device, which includes a wave-damping body and a wave-damping block. The wave-damping body is provided with a receiving cavity for accommodating the wave-damping block, and the side of the wave-damping body facing the flowing medium is provided with a through hole communicating with the receiving cavity.

2. The erosion corrosion water environment control system according to claim 1, characterized in that, The cooling system also includes a temperature detection device and a temperature regulation device. The probe end of the temperature detection device extends into the flowing medium to detect the temperature of the flowing medium. The temperature regulation device is located outside the sealed cylinder and is connected to the heat exchanger.

3. The scouring and corrosion water environment control system according to claim 1, characterized in that, The rotating mechanism includes a brushless servo motor and a hollow connecting rod. One end of the hollow connecting rod is connected to the output end of the brushless servo motor, and the other end is connected to the turntable.

4. The scouring and corrosion water environment control system according to claim 3, characterized in that, The sealing cover is provided with a mounting hole for the hollow connecting rod to pass through, and a magnetic sealing coupling is provided between the hollow connecting rod and the mounting hole.

5. The scouring and corrosion water environment control system according to claim 1, characterized in that, The sealing cylinder is made of glass fiber reinforced polyetheretherketone, the sealing cap is made of metal, and the sealing cap has a viewing window.

6. The scouring and corrosion water environment control system according to claim 1, characterized in that, The scouring and corrosion water environment control system further includes a flow rate sensor and / or a dissolved oxygen sensor. The flow rate sensor is installed on the sealing cover, and the detection end of the flow rate sensor extends into the flowing medium. The dissolved oxygen sensor is installed on the sealing cover, and the detection end of the dissolved oxygen sensor extends into the flowing medium.

7. A scouring corrosion testing apparatus, characterized in that, The system includes an electrochemical workstation, an electrode assembly, and a water environment control system for scouring and corrosion as described in any one of claims 1-6. The electrode assembly is mounted on a sealing cover of the water environment control system for scouring and corrosion and is electrically connected to the electrochemical workstation.

8. A test method based on the erosion corrosion test apparatus according to claim 7, characterized in that, Includes the following steps: Prepare the test fluid medium and inject it into the sealed cylinder; The test sample is installed on the turntable inside the sealed cylinder and electrically connected to the electrochemical workstation; The electrode assembly is mounted on the sealing cover and electrically connected to the electrochemical workstation. The sealing cap is sealed to the sealing cylinder. Set the test parameters, and start the electrochemical test after the flow rate and temperature of the fluid medium have stabilized, and record the test data. The test method is performed using the erosion corrosion test apparatus described in claim 7.

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