Crack corrosion testing device

Abstract

The invention discloses a crevice corrosion test device, and relates to the technical field of environmental tests.The crevice corrosion test device comprises a test bed, an upper sample assembly, a lower test assembly and a detection assembly, the test bed is provided with a test container, a displayer, a work station and an environmental liquid container, and the environmental liquid container is communicated with the test container through a pipeline; the upper sample assembly comprises an upper sample clamping piece with a function of moving along the direction perpendicular to the test bed and is used for clamping and fixing an upper sample, and the upper sample assembly comprises a lower sample clamping piece with a function of reciprocating along the direction parallel to the test bed and is used for clamping and fixing a lower sample; the detection assembly comprises a thermometer and a pressure meter which are electrically connected with the work station, and at least two acoustic emission sensors arranged on the peripheral side of the lower sample clamping piece, the crevice corrosion conditions under different conditions are accurately monitored, the test device is rich in function, and meanwhile, the simulation experiment result is stable and reliable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of environmental testing, more particularly to a crevice corrosion testing device. BACKGROUND

[0002] Crevice corrosion occurs in narrow gaps, often in sealing gaskets, bolt thread connections. The occurrence of crevice corrosion is relatively concealed, and the incubation period is long and difficult to monitor. Fretting wear is caused by micro-vibration between the contact surfaces, which is often seen in mechanical interfaces such as bolt connections and bearing cooperation. It has the characteristics of strong concealment and difficult detection of initial damage, and is easy to cause sudden accidents. In recent years, the coupling effect of crevice corrosion and fretting wear has attracted widespread attention in the fields of industry and human joint treatment. The coupling effect of crevice corrosion and fretting wear makes the material fail cooperatively in the environment where fretting and corrosion coexist, so it is very important to judge the crevice corrosion in time and fully.

[0003] In summary, how to effectively test the crevice corrosion of different materials and environments is a problem that needs to be solved by the technical personnel in the field. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a crevice corrosion testing device, which can be used for crevice corrosion experiments under different environments, so as to fully judge the corrosion state of different materials in use.

[0005] In order to achieve the above purpose, the present application provides the following technical scheme:

[0006] A crevice corrosion testing device, comprising:

[0007] A test table, wherein a test container, a display, a workstation and an environmental liquid container are arranged on the test table, and the environmental liquid container is in communication with the test container through a pipeline;

[0008] An upper sample assembly, wherein the upper sample assembly comprises an upper sample clamping piece having a moving function perpendicular to the test table, and is used for clamping and fixing an upper sample;

[0009] A lower sample assembly, wherein the upper sample assembly comprises a lower sample clamping piece having a reciprocating moving function parallel to the test table, and is used for clamping and fixing a lower sample;

[0010] A detection assembly, wherein the detection assembly comprises a thermometer, a pressure gauge and at least two acoustic emission sensors arranged on the side of the lower sample clamping piece, and the thermometer and the pressure gauge are electrically connected to the workstation.

[0011] Further, the test container comprises a shell and an upper cover, the upper cover and the shell are detachably and sealingly connected, and the thermometer and the pressure gauge are installed on the upper cover.

[0012] Further, the test container is provided with an inlet pipe and an outlet pipe, the inlet pipe and the outlet pipe are located at opposite sides of the test container respectively, and are communicated with the environment liquid container, and a peristaltic pump is arranged on the inlet pipe.

[0013] Further, the test container is provided with an inlet pipe and an outlet pipe, the inlet pipe and the outlet pipe are located at opposite sides of the test container respectively, and are communicated with the environment liquid container, and a peristaltic pump is arranged on the inlet pipe.

[0014] A gas supply device is communicated with the test container through a pipeline.

[0015] Further, the test container is provided with an inlet pipe and an outlet pipe, the inlet pipe and the outlet pipe are located at opposite sides of the test container respectively, and are communicated with the environment liquid container, and a peristaltic pump is arranged on the inlet pipe.

[0016] A temperature control assembly is arranged on the cover, and the temperature control assembly comprises a heating rod and a semiconductor refrigeration sheet, the heating rod and the semiconductor refrigeration sheet are fixed to the cover and the test container respectively, and the heating rod and the semiconductor refrigeration sheet are electrically connected to the workstation.

[0017] Further, the upper test sample assembly further comprises:

[0018] A push rod is slidingly sealed to the upper cover, and the upper test sample holder is mounted to an end of the push rod located in the test container.

[0019] An upper driving member is mounted to the upper cover, and the upper driving member is used for controlling the push rod to move in a direction perpendicular to the test bench.

[0020] Further, the lower test assembly further comprises:

[0021] A bracket is fixed to the test container, and a sliding groove is arranged on a side of the bracket close to the upper test sample holder, and the lower test sample holder is slidingly arranged in the sliding groove.

[0022] A lower driving member is used for controlling the lower test sample holder to slide in the sliding groove.

[0023] Further, the lower test assembly further comprises:

[0024] A magnetic coupler driving rotor is rotationally mounted to the test bench, and the lower driving member is used for controlling the magnetic coupler driving rotor to rotate.

[0025] A magnetic coupler driven rotor is rotationally mounted to a limiting groove in the test container, the magnetic coupler driven rotor is coaxially arranged with a rotating disc, the rotating disc is arranged with a rotating shaft having a preset interval with the rotating disc, and the rotating shaft is connected with the lower test sample holder.

[0026] Further, the lower test assembly further comprises:

[0027] Two limiting protrusions, two limiting protrusions are arranged on the side of the rotating shaft away from the rotating disc;

[0028] A connecting piece, the connecting piece is slidingly installed in the gap between the two limiting protrusions, so that the connecting piece and the two limiting protrusions are arranged in a cross shape, and the connecting piece is connected with the lower sample clamping piece.

[0029] The application further comprises:

[0030] An electrode assembly, the electrode assembly includes a counter electrode and an auxiliary electrode, the counter electrode and the auxiliary electrode are fixed to the upper cover, and are electrically connected to the workstation through a wire.

[0031] The slit corrosion test device provided by the application has the advantages that when the device is used, the experimental container is fixed on the test table, the test table is also provided with a display, a workstation and an environmental liquid container, the display is used to display the detection results, the workstation is used to control the electrical components of the experimental device, and the electrical signals of the thermometer, the pressure gauge and the at least two acoustic emission sensors arranged on the side of the lower sample clamping piece are received and processed, so that the electrical signal information is displayed through the display, and the environmental liquid container can provide different environmental solutions for different required test environments, which is beneficial to improve the richness of the test object. The upper sample assembly includes an upper sample clamping piece which has a moving function in the direction perpendicular to the test table and is used to clamp and fix the upper sample. The lower sample assembly includes a lower sample clamping piece which has a reciprocating moving function in the direction parallel to the test table and is used to clamp and fix the lower sample. The upper and lower sample clamping pieces can effectively clamp the upper and lower samples and keep a required preset distance between the upper and lower samples, and can also simulate the wear condition between the upper and lower samples in the use environment. The slit corrosion condition under different conditions can be accurately monitored. The test device has rich functions, and the simulation experimental results are stable and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0032] 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 the prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0033] Figure 1 Structure diagram of the front shaft side of the test device provided by the present application;

[0034] Figure 2 Structure diagram of the back shaft side of the test device provided by the present application;

[0035] Figure 3 Structure diagram of the front side of the test device provided by the present application is shown in the figure;

[0036] Figure 4 Structure diagram of the side of the test device provided by the present application is shown in the figure;

[0037] Figure 5 Structure diagram of the style shaft side of the test device provided by the present application is shown in the figure;

[0038] Figure 6 Structure diagram of the local amplification of A provided by the present application is shown in the figure;

[0039] Figure 7 Structure diagram of the upper and lower test sample parts provided by the present application is shown in the figure.

[0040] Figures 1-7 In the figure, the reference signs include:

[0041] 1, test bench; 2, test container; 201, upper cover; 202, shell; 3, display; 4, workstation; 5, environmental liquid container; 501, liquid inlet pipe; 502, liquid outlet pipe; 503, peristaltic pump; 6, upper test sample assembly; 601, push rod; 602, upper driving part; 603, upper test sample clamping part; 7, lower test assembly; 701, lower driving part; 702, magnetic coupler driving rotor; 703, lower test clamping part; 704, bracket; 705, sliding chute; 706, sliding block; 707, limiting protrusion; 708, magnetic coupler driven rotor; 709, rotating shaft; 710, connecting part; 8, detection assembly; 801, thermometer; 802, pressure gauge; 803, acoustic emission sensor; 9, gas supply device; 10, temperature control assembly; 1001, semiconductor refrigerating sheet; 1002, heating rod; 11, electrode assembly; 1101, auxiliary electrode; 1102, counter electrode. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0043] The core of the present application is to provide a crevice corrosion test device, which can be used for experiments on crevice corrosion under different environments, so as to fully judge the corrosion state when different materials are used.

[0044] Please refer to Figure 1The crevice corrosion testing device comprises a testing table 1, an upper sample assembly 6, a lower sample assembly 7 and a detection assembly 8, the testing table 1 is provided with a testing container 2, a display 3, a workstation 4 and an environmental liquid container 5, the environmental liquid container 5 is communicated with the testing container 2 through a pipeline, the upper sample assembly 6 comprises an upper sample clamping piece 603 with a moving function along a direction perpendicular to the testing table 1 and is used for clamping and fixing an upper sample, the upper sample assembly 6 comprises a lower sample clamping piece 703 with a reciprocating moving function along a direction parallel to the testing table 1 and is used for clamping and fixing a lower sample, and the detection assembly 8 comprises a thermometer 801, a pressure gauge 802 and at least two acoustic emission sensors 803 arranged on the periphery of the lower sample clamping piece 703 and electrically connected with the workstation 4.

[0045] It should be noted that the testing table 1 in the embodiment of the present application is a platform structure, specifically, the testing table 1 can adopt a desktop form, and the height of the desktop is adjustable to adapt to the requirements of different use heights.

[0046] In addition, the workstation 4 in the embodiment of the present application can comprise an acoustic emission transmitter workstation 4, a chemical workstation 4 and a controller, the required workstations 4 and the control are integrated and arranged, and are covered by a shell 202 or a protective cover, which is beneficial to improve the integration of the testing device and improve the appearance of the testing device.

[0047] Optionally, in some embodiments, one of the acoustic emission sensors 803 is arranged on the top of the lower sample clamping piece 703 and is in contact with the lower sample, so as to collect high-frequency stress waves generated by the release of residual stress due to the destruction of metal lattice in the corrosion process, a wire harness is connected with an acoustic emission data processing device through the lower sample clamping piece 703 to realize real-time in-situ monitoring of the crevice corrosion, and the other acoustic emission sensor 803 is arranged in the medium beside the upper sample and the lower sample, and the gas generated in the corrosion reaction process is gathered and escapes in the crevice, so that the side acoustic emission sensor 803 realizes the monitoring of the crevice corrosion by collecting low-frequency signals generated when the bubbles are broken, and the side acoustic emission sensor 803 extends into the medium inside from the opening of the testing container 2.

[0048] In the above embodiment, the testing container 2 is provided with a support rod, and the support rod is provided with a clamp, so that the side acoustic emission sensor 803 can be fixed with the clamp, and the position of the side acoustic emission sensor 803 in the testing container can be effectively fixed.

[0049] In the above embodiment, the support rod is rotatably installed on the bottom of the testing container 2 through a ball hinge, and the support rod has a telescopic function, and a telescopic rod can be used instead, so that the specific position of the side acoustic emission sensor 803 can be manually adjusted quickly and conveniently according to different experimental requirements, and a wire harness is connected with an acoustic emission processing device for data analysis.

[0050] In the embodiment of the present application, the experimental container is fixed on the test table 1, and the test table 1 is further provided with a display 3, a workstation 4 and an environmental liquid container 5, wherein the display 3 is used for displaying the detection results, the workstation 4 is used for controlling the electrical components of the experimental device, and the electrical signals of the thermometer 801, the pressure gauge 802 and the at least two acoustic emission sensors 803 arranged on the side of the lower sample clamping piece 703 are received and processed, so that the electrical signal information is displayed through the display 3, and the environmental liquid container 5 can provide different environmental solutions for different required test environments, which is beneficial to improve the richness of the test object. The upper sample assembly 6 includes an upper sample clamping piece 603 having a moving function perpendicular to the test table 1, and is used for clamping and fixing the upper sample. The upper sample assembly 6 includes a lower sample clamping piece 703 having a reciprocating movement function parallel to the test table 1, and is used for clamping and fixing the lower sample. The upper and lower sample clamping pieces 703 can effectively clamp the upper and lower samples, and can keep the required preset distance between the upper and lower samples, and can also simulate the wear condition between the upper and lower samples in the simulated use environment, so as to accurately monitor the crevice corrosion under different conditions. The experimental device has rich functions, and the simulation experimental results are stable and reliable.

[0051] Optionally, in some embodiments, the upper and lower sample clamping pieces 703 can adopt a groove structure, and the upper and lower samples are fixed in the upper and lower sample clamping pieces 703 by interference fit. The material of the upper sample can be selected from metal or non-metal material, and the material of the lower sample is selected from metal material, so that the connecting wire serves as a working electrode, and all samples need to be polished, ultrasonically cleaned and dried before testing.

[0052] In other embodiments, the upper and lower sample clamping pieces 703 each include a support plate, a first clamping plate is fixed on the support plate, a second clamping plate is slidably arranged on the support plate, a screw rod is rotatably installed on the first clamping plate, and the screw rod is threadedly connected with the second clamping plate. Therefore, when the screw rod is rotated, the distance between the first clamping plate and the second clamping plate can be adjusted to clamp the sample.

[0053] Optionally, in some embodiments, the upper and lower sample clamping pieces 703 are made by 3D printing, and use photosensitive resin, ceramic or other insulating materials.

[0054] Optionally, in some embodiments, the lower sample clamping piece 703 is provided with a copper wire hole.

[0055] Please refer to Figure 1In some embodiments, the test container 2 comprises a shell 202 and a cover 201, the cover 201 and the shell 202 are detachably and sealingly connected, the thermometer 801 and the pressure gauge 802 are installed on the cover 201, that is, the shell 202 is connected through the cover 201 to facilitate the replacement of the test sample and the maintenance and repair of the detection components.

[0056] Optionally, in some embodiments, the thermometer 801 and the pressure gauge 802 are fixedly installed on the cover 201 through the reserved installation holes on the cover 201, and the thermometer 801 and the pressure gauge 802 are sealingly connected with the cover 201.

[0057] Optionally, in some embodiments, the cover 201 is detachably connected with the test container 2 through bolts and is sealingly connected with the test container 2 through the combination of metal gaskets and fluorine rubber O-rings.

[0058] In other embodiments, the cover 201 is hingedly connected with the test container 2, specifically, one side of the cover 201 is hingedly connected with the test container 2, and the other side of the cover 201 is provided with a lock catch matched with the test container 2, and the cover 201 is quickly closed with the test container 2 through the lock catch.

[0059] Please refer to Figure 1 In some embodiments, the test container 2 is provided with an inlet pipe 501 and an outlet pipe 502, the inlet pipe 501 and the outlet pipe 502 are respectively located on the opposite sides of the test container 2 and are both connected with the environment liquid container 5, and the inlet pipe 501 is provided with a peristaltic pump 503, that is, the test container and the environment liquid container 5 are connected through the inlet pipe 501 and the outlet pipe 502 connected with the test container 2, and the peristaltic pump 503 is used to realize the flow of the test environment simulation medium.

[0060] Optionally, in some embodiments, the inlet pipe 501 and the outlet pipe 502 are connected with the test container 2 through flanges.

[0061] Optionally, in some embodiments, the environment container is provided with an opening and a liquid outlet, the opening is used to add the environment liquid, and the liquid outlet is used to completely discharge the previous environment liquid before the environment liquid is replaced.

[0062] Optionally, in some embodiments, the test container 2 is provided with a liquid outlet, the liquid outlet is used to completely discharge the previous environment liquid before the environment liquid is replaced, and specifically, the liquid outlet is arranged at the bottom of the test container to facilitate the complete discharge of the environment liquid.

[0063] In the above embodiments, the liquid outlet is a threaded hole, and the liquid outlet is closed through bolts.

[0064] Please refer toFigure 1 In some embodiments, the gas supply device 9 is further included, which is communicated with the test container 2 through a pipeline, and the gas is input into the test container 2 from a gas source through a gas conveying pipeline to simulate the pressure under different working conditions, and a pressure gauge is used to display the pressure value in the test container 2 in real time.

[0065] In the above embodiments, the gas supply device 9 includes a gas source device, a gas pump and a gas conveying pipeline, and in the specific implementation, each interface of the test container 2 is sealed to enable the test container 2 to withstand high pressure.

[0066] Please refer to Figure 1 In some embodiments, the temperature control assembly 10 is further included, which includes a heating rod 1002 fixed to the upper cover 201 and a semiconductor refrigeration sheet 1001 fixed to the upper cover 201, and the heating rod 1002 and the semiconductor refrigeration sheet 1001 are electrically connected to the workstation 4, that is, the heating rod 1002 is used to heat the environmental liquid in the test container 2, and the semiconductor refrigeration sheet 1001 is used to cool the environmental liquid in the test container 2, and through the cooperation of the above two structures and the thermometer 801, the temperature of the environmental liquid in the test container 2 can be quickly controlled and maintained to simulate different temperatures under different use environments and increase the richness of the test.

[0067] Optionally, in some embodiments, to increase the temperature control efficiency of the environmental liquid in the test container 2, a plurality of heating rods 1002 and corresponding semiconductor refrigeration sheets 1001 can be arranged.

[0068] In other embodiments, the heating rod 1002 can be replaced by a heating belt, and specifically, the heating belt is wound outside the liquid inlet pipe 501, and the outside is wrapped with thermal insulation material, so that the heating efficiency of the environmental liquid can be greatly improved.

[0069] Please refer to Figure 1 In some embodiments, the upper sample assembly 6 further includes a push rod 601 and a driving member, the push rod 601 is slidingly sealed to the upper cover 201, the upper sample clamping member 603 is installed at the end of the push rod 601 located in the test container 2, and the driving member is installed on the upper cover 201, and the driving member is used to control the push rod 601 to move in the direction perpendicular to the test bench 1, that is, the driving member is used to control the push rod 601 to move, so as to adjust the distance between the upper sample clamping member 603 and the lower sample clamping member 703 to meet the test requirements of different materials and different gap widths.

[0070] Optionally, in some embodiments, the driving member can be a gas cylinder, and specifically, a bracket 704 is installed on the upper cover 201, the gas cylinder is fixed to the bracket 704, and the push rod 601 is slidingly sealed to the upper cover 201, so that the position of the upper sample clamping member 603 can be quickly adjusted through the gas cylinder.

[0071] In other embodiments, an electric cylinder, a hydraulic cylinder can be used instead of the air cylinder, and the position of the upper sample clamping piece 603 can also be quickly adjusted, or a lead screw is used, specifically, the lead screw is threadedly connected with the upper cover 201, the thread can increase the sealing effect, and a smooth sliding block 706 is arranged on the end of the lead screw extending out of the test container 2, a gear with a relatively long width is in spline connection with the sliding block, a support 704 is arranged on the upper cover 201, a motor reducer is arranged on the support 704, and a driving gear in mesh with the gear is arranged on the output end of the motor reducer, so that when the motor rotates, the lead screw moves up and down, the position of the upper sample clamping piece 603 is quickly adjusted, the locking function of the lead screw reduces damage to the driving part, and the service life of the driving part is prolonged.

[0072] Please refer to Figure 1 In some embodiments, the lower test assembly 7 further comprises a support 704 and a driving part, the support 704 is fixed in the test container 2, a sliding groove 705 is arranged on one side of the support 704 close to the upper sample clamping piece 603, and the lower sample clamping piece 703 is slidingly arranged in the sliding groove 705; the driving part is used to control the sliding of the lower sample clamping piece 703 in the sliding groove 705, that is, through the sliding of the lower sample clamping piece 703 in the sliding groove 705, the lower sample clamping piece 703 has a one-way sliding effect relative to the upper sample, which is beneficial to simulate the fretting corrosion working condition under different conditions and improve the richness of the test.

[0073] Optionally, in some embodiments, a sliding block 706 is slidingly arranged in the sliding groove 705, and the lower sample clamping piece 703 is fixed to the sliding block 706; a bearing combination corresponding to the sliding direction of the sliding block 706 is arranged on the support 704, so as to reduce the resistance of the sliding block 706 during sliding.

[0074] Please refer to Figure 1 In some embodiments, the lower test assembly 7 further comprises a magnetic coupler driving rotor 702 and a magnetic coupler driven rotor 708, the magnetic coupler driving rotor 702 is rotatably arranged on the test bench 1, the driving part is used to control the rotation of the magnetic coupler driving rotor 702, a limiting groove is arranged in the test container 2, the magnetic coupler driven rotor 708 is rotatably arranged in the limiting groove, a rotating disc is coaxially arranged on the magnetic coupler driven rotor 708, a rotating shaft 709 with a preset distance from the rotating disc is arranged on the rotating disc, and the rotating shaft 709 is connected with the lower sample clamping piece 703, that is, through the eccentrically arranged rotating shaft 709, the sliding of the lower sample clamping piece 703 in the sliding groove 705 is controlled, and the magnetic coupler is used to avoid increasing the number of openings of the test container 2, which avoids the risk of increasing the leakage of the test container 2 due to the driving structure of the lower sample clamping piece 703, and improves the accuracy of the test structure.

[0075] Optionally, in some embodiments, the contact positions of the magnetic coupler driving rotor 702 and the magnetic coupler driven rotor 708 with the test bench 1 or the test container 2 are rotatably connected, and the smoothness of rotation can be improved by adding a bearing combination.

[0076] Please refer to Figure 1 In some embodiments, the lower test assembly 7 further comprises two limiting protrusions 707 and a connecting piece 710, the two limiting protrusions 707 are arranged on the side of the rotating shaft 709 away from the rotating disc, and the connecting piece 710 is slidingly installed in the gap between the two limiting protrusions 707, so that the connecting piece 710 and the two limiting protrusions 707 are arranged in a cross shape, the connecting piece 710 is connected with the lower test sample holder 703, and through the cooperation of the connecting piece 710 and the limiting protrusions 707, the connecting piece 710 slides between the limiting protrusions 707, and the connecting piece 710 is connected with the lower test sample holder 703, so as to realize the reciprocating sliding of the lower test sample holder 703 along the sliding direction of the sliding groove 705.

[0077] In the above embodiment, the connecting piece 710 is in a U-shaped structure, and the two ends of the U-shaped structure are fixedly connected with the lower test sample holder 703.

[0078] In the above embodiment, a bearing combination can be added at the contact position of the connecting piece 710 and the two limiting protrusions 707 to improve the smoothness of rotation.

[0079] Optionally, in some embodiments, the frequency adjustment range of the micro-motion of the lower test sample is set to 1-10 Hz, and the amplitude adjustment range is set to 10-1000 μm.

[0080] In the above, the driving rotor is embedded with N / S alternating permanent magnets, the magnetic coupler driven rotor 708 is also a permanent magnet, and the magnetic poles are arranged in mirror symmetry with the driving rotor, the upper and lower parts of the magnetic coupler are separated by the bottom surface of the high-pressure sealed cavity, the sealed cavity is made of non-magnetic material, and when the driving rotor rotates, its magnetic field also rotates, at this time the magnetic poles of the driven rotor are subjected to magnetic pull and rotate with the driving rotor.

[0081] Please refer to Figure 1 In some embodiments, an electrode assembly 11 is further included, the electrode assembly 11 comprises a counter electrode 1102 and an auxiliary electrode 1101, the counter electrode 1102 and the auxiliary electrode 1101 are fixed to the upper cover 201 and are electrically connected with the workstation 4 through wires, that is, the working electrode is the metal test sample on the lower test sample platform, which is connected with the copper wire through soldering, the counter electrode 1102 uses a standard reference electrode, and the auxiliary electrode 1101 is a platinum electrode, the copper wire is led out from the side of the lower test sample platform, passes through the cover plate to connect the electrochemical workstation 4, and the counter electrode 1102 and the auxiliary electrode 1101 are fixed in the corresponding holes of the end cover and are connected with the workstation 4 through wires.

[0082] Optionally, in some embodiments, the electrode material can be selected according to different requirements, such as aluminum nickel cobalt, ferrite, etc.

[0083] The specific test process is as follows:

[0084] In this embodiment, X70 steel is selected as the experimental material, and the X70 steel with a size of 30mm*30mm*40mm is cut as the upper sample, and the X70 steel with a size of 50mm*50mm*5mm is cut as the lower sample.

[0085] The surface of the sample is polished by using sandpaper and mirror polished by using polishing paste. After polishing, the sample is placed in an acetone solution for ultrasonic cleaning to remove oil stains.

[0086] The copper wire is quickly welded to the non-working surface of the lower sample by using tin soldering, and is led out from the lower sample platform. The treated X70 steel sample is packaged in the upper sample clamping piece 603 and the lower sample clamping piece 703.

[0087] In this embodiment, a 3.5% NaCl solution is configured to simulate a seawater environment, the solution needs to immerse the upper and lower samples, the pH value of the solution is adjusted to 8.0 by using HCl and NaOH, and nitrogen gas is introduced for 30 minutes to remove oxygen in the solution to ensure the accuracy of the experiment. The prepared solution is injected into the test container 2, the cover 201 is covered and fixed with bolts, the counter electrode 1102, the auxiliary electrode 1101, the heating rod 1002, the thermometer 801 and the pressure gauge are inserted into the corresponding hole positions of the test container 2, and the sealing rings are used for sealing, the semiconductor cooling sheet is attached to the side wall of the cavity, and after sealing, the temperature of the solution is controlled to 20℃ by the heating rod 1002 and the semiconductor cooling sheet, the gas supply device 9 is opened to introduce nitrogen gas, and the pressure in the cavity is slowly increased to 1.5MPa and kept constant. The peristaltic pump 503 is started to circulate the dynamic simulation medium, and the flow rate is set to 1m / s.

[0088] The lower motor 34 is started, the magnetic coupler driving rotor 702 is rotated by the lower driving part 701, the magnetic coupler driven rotor 708 is placed in a mirror image with the magnetic coupler driving rotor 702, and the magnetic coupler driven rotor 708 drives the lower sample clamping piece 703 to reciprocate through the eccentric structure, and the frequency of the micro-motion is set to 5Hz and the amplitude is 150μm.

[0089] The working electrode, the counter electrode 1102 and the auxiliary electrode 1101 are connected to the lead wire and connected to the workstation 4 to measure the corrosion current density, the crevice corrosion coefficient (rate) and other parameters. The acoustic emission sensor 803 is connected to the acoustic emission workstation 4 through the lead wire to collect acoustic signals.

[0090] After the experiment is completed, the inside of the cavity is depressurized, and various instruments are closed. By analyzing the amplitude-frequency spectrum diagram and event rate-time curve and the polarization curve, electrochemical impedance, cyclic voltammetry curve and other electrochemical related curves collected by the electrochemical workstation 4, and sampling and characterization of the sample, the crevice corrosion under fretting condition is studied.

[0091] That is, the focus of the present application is that the experimental container is fixed on the test table 1, and the test table 1 is also provided with a display 3, a workstation 4 and an environmental liquid container 5, wherein the display 3 is used to display the test results, the workstation 4 is used to control the various electrical components of the experimental device, and the electrical signals of the thermometer 801, the pressure gauge 802 and the at least two acoustic emission sensors 803 arranged on the side of the lower sample holder 703 are received and processed, so that the electrical signal information is displayed through the display 3, and the environmental liquid container 5 can provide different environmental solutions for different required test environments, which is beneficial to improve the richness of the test object, the upper sample assembly 6 includes an upper sample holder 603 having a moving function perpendicular to the test table 1, and is used to clamp and fix the upper sample, the upper sample assembly 6 includes a lower sample holder 703 having a reciprocating moving function parallel to the test table 1, and is used to clamp and fix the lower sample, the upper and lower sample holders 703 are used to effectively clamp the upper and lower samples, and the upper and lower samples can maintain the required preset distance, and the wear condition between the upper and lower samples in the simulated use environment can also be simulated, so that the crevice corrosion under different conditions can be accurately monitored. The experimental device is rich in function, and the simulated experimental results are stable and reliable.

[0092] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.

[0093] The above describes in detail a crevice corrosion test device provided by the present application. The principles and implementation modes of the present application are described by applying specific examples in this paper. The above description of the embodiments is only used to help understand the method of the present application and its core idea. It should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. A crevice corrosion test device characterized by comprising: The utility model relates to a kind of experimental bench, including: Test bench (1), which is provided with test container (2), display (3), workstation (4) and environmental liquid container (5) on the test bench (1), the environmental liquid container (5) is communicated with the test container (2) by pipeline; Upper sample assembly (6), the upper sample assembly (6) includes upper sample holder (603) with the function of moving in the direction perpendicular to the test bench (1), and is used to clamp and fix upper sample; Lower test assembly (7), the upper sample assembly (6) includes lower sample holder (703) with reciprocating movement in the direction parallel to the test bench (1), and is used to clamp and fix lower sample; Detection assembly (8), the detection assembly (8) includes thermometer (801), pressure gauge (802) and at least two acoustic emission sensors (803) arranged on the side of the lower sample holder (703) and electrically connected to the workstation (4).

2. The crevice corrosion test apparatus according to claim 1, characterized by The test container (2) includes a shell (202) and an upper cover (201), the upper cover (201) and the shell (202) are detachably and sealingly connected, the thermometer (801) and the pressure gauge (802) are installed on the upper cover (201).

3. The crevice corrosion test apparatus according to claim 2, characterized by The test container (2) is provided with a liquid inlet pipe (501) and a liquid outlet pipe (502), the liquid inlet pipe (501) and the liquid outlet pipe (502) are respectively located on opposite sides of the test container (2) and are in communication with the environmental liquid container (5), and the liquid inlet pipe (501) is provided with a peristaltic pump (503).

4. The crevice corrosion test apparatus according to claim 2, characterized by Further comprising: Gas supply device (9), which is communicated with the test container (2) by pipeline.

5. The crevice corrosion test apparatus according to claim 2, characterized by Further comprising: Temperature control assembly (10), the temperature control assembly (10) includes a heating rod (1002) fixed to the upper cover (201) and a semiconductor refrigerating sheet (1001) fixed to the test container (2), and the heating rod (1002) and the semiconductor refrigerating sheet (1001) are electrically connected to the workstation (4).

6. The crevice corrosion test apparatus according to claim 2, characterized by The upper sample assembly (6) further comprises: A push rod (601) is slidingly sealed in the upper cover (201), and the upper sample holder (603) is installed on the end of the push rod (601) located in the test container (2); An upper driving member (602) is installed on the upper cover (201), and the upper driving member (602) is used to control the push rod (601) to move in the direction perpendicular to the test bench (1).

7. The crevice corrosion test apparatus according to claim 2, characterized by The lower test assembly (7) further comprises: A bracket (704) is fixed in the test container (2), and a sliding groove (705) is arranged on the side of the bracket (704) close to the upper sample holder (603), and the lower sample holder (703) is slidingly arranged in the sliding groove (705); A lower driving member (701) is used to control the lower sample holder (703) to slide in the sliding groove (705).

8. The crevice corrosion test apparatus according to claim 7, characterized by The lower test assembly (7) further comprises: A magnetic coupling driving rotor (702) is rotatably installed on the test bench (1), and the lower driving member (701) is used for controlling rotation of the magnetic coupling driving rotor (702); A magnetic coupling driven rotor (708) is rotatably installed in a limiting groove in the test container (2), and the magnetic coupling driven rotor (708) is coaxially installed with a rotating disc, the rotating disc is installed with a rotating shaft (709) having a preset interval with the axis of the rotating disc, and the rotating shaft (709) is connected with the lower sample clamping member (703).

9. The crevice corrosion test apparatus according to claim 8, characterized by The lower test assembly (7) further comprises: Two limiting protrusions (707) are arranged on a side of the rotating shaft (709) away from the rotating disc; A connecting member (710) is slidably installed in a gap between the two limiting protrusions (707), so that the connecting member (710) and the two limiting protrusions (707) are arranged in a cross shape, and the connecting member (710) is connected with the lower sample clamping member (703).

10. The crevice corrosion test apparatus according to any one of claims 2 to 9, characterized by Further comprising: An electrode assembly (11) comprises a counter electrode (1102) and an auxiliary electrode (1101), the counter electrode (1102) and the auxiliary electrode (1101) are both fixed to the upper cover (201), and are electrically connected with the workstation (4) through wires.

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