An experimental self-anchored stress electrochemical corrosion device and experimental method

Abstract

An experimental self-anchored stress electrochemical corrosion device and experimental method, comprising a support mechanism, a test piece assembly arranged on the support mechanism, and an electrolysis mechanism arranged on the upper end of the test piece assembly; the support mechanism comprises two bases, and the upper ends of the two bases are respectively provided with support columns for supporting the test piece assembly; the test piece assembly comprises a first test piece arranged above the base and a second test piece arranged above the first test piece. The electrolytic cell is arranged on the upper end of the test piece, and a support is arranged between the test pieces, so that the test piece can be subjected to four-point bending loading, the upper surface of the pure bending section of the test piece reaches a predetermined tensile stress, the preloading is maintained for corrosion characteristic testing, different tensile stresses can be changed to realize the testing of the corrosion characteristics of the test piece under different tensile stresses, the flexibility is high, the testing effect is good, and the device is convenient to use.

Description

Technical Field

[0001] This invention relates to the field of electrochemical corrosion technology, and in particular to a self-anchoring stress electrochemical corrosion apparatus and experimental method for use in experiments. Background Technology

[0002] Metallic materials are often used in stress environments. When studying the corrosion and deterioration mechanisms of metallic materials, stress usually needs to be taken into account, and the durability of materials under the coupled effects of stress and corrosion needs to be studied.

[0003] Most existing stress corrosion apparatuses on the market involve direct contact between the specimen, fixtures, and other components and the corrosive liquid. During the experiment, the relative slippage between the sealing position and the loading device can lead to leakage of the corrosive liquid. Furthermore, it is not convenient to quickly change the stress of the specimen during the corrosion test, making operation inconvenient and requiring improvement. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems of corrosion liquid leakage in the existing stress corrosion apparatus and the inconvenience of quickly changing the stress of the specimen during the test, the present invention is proposed.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an experimental self-anchored stress electrochemical corrosion device, comprising a support mechanism, a specimen assembly disposed on the support mechanism, and an electrolysis mechanism disposed on the upper end of the specimen assembly; the support mechanism includes two bases, each with a support column at its upper end for supporting the specimen assembly; the specimen assembly includes a first specimen disposed on the base and a second specimen disposed on the first specimen; the electrolysis mechanism includes an electrolysis cell disposed on the upper end of the second specimen, a counter electrode disposed inside the electrolysis cell, and a reference electrode disposed inside the electrolysis cell.

[0007] As a preferred embodiment of the experimental self-anchored stress electrochemical corrosion device of the present invention, the first and second specimens are both provided with through holes, and the first and second specimens are both sleeved on the support column through the through holes.

[0008] As a preferred embodiment of the self-anchored stress electrochemical corrosion device for experiments described in this invention, two supports are provided between the first and second specimens, both of which are made of high-strength nylon material to prevent the supports from sliding along the longitudinal direction of the specimen assembly.

[0009] As a preferred embodiment of the experimental self-anchored stress electrochemical corrosion device of the present invention, the electrolytic cell includes a PVC pipe, the PVC pipe is located at the middle of the upper end of the second specimen, and the space between the PVC pipe and the second specimen is filled with sealant.

[0010] As a preferred embodiment of the experimental self-anchored stress electrochemical corrosion device of the present invention, the counter electrode is a platinum mesh electrode and the reference electrode is Ag / AgCl (saturated KCl).

[0011] As a preferred embodiment of the experimental self-anchored stress electrochemical corrosion device of the present invention, the support column includes a column body rotatably mounted on the base, a sleeve is fitted on the column body, a guide groove is provided on the side wall of the sleeve, a locking sleeve is provided at the top of the column body and the sleeve, and a sliding strip matching the guide groove is provided on the inner wall of the locking sleeve.

[0012] As a preferred embodiment of the experimental self-anchored stress electrochemical corrosion device of the present invention, wherein: a support plate for supporting the first specimen is sleeved on the column; a plurality of ratchet teeth are arranged on both sides of the column for limiting the locking sleeve; a sliding rod is slidably arranged inside the column; the top end of the sliding rod passes through the column and the locking sleeve and extends above the locking sleeve; a fixing plate is sleeved on the portion of the sliding rod inside the locking sleeve; a compression spring is provided between the fixing plate and the sliding rod; a plurality of push rods are hinged to the bottom end of the sliding rod; one end of the push rod passes through a through groove opened on the side wall of the column; the push rod is located below the support plate and provides support force to the support plate.

[0013] As a preferred embodiment of the self-anchored stress electrochemical corrosion device for experiments described in this invention, the locking sleeve includes a sleeve body, an upper pressure plate at the top of the sleeve body, a lower pressure ring plate at the bottom of the sleeve body, the lower pressure ring plate abutting against the upper surface of the second specimen, a pawl that matches the ratchet tooth is hinged to the inner wall of the sleeve body, and a limiting block is provided on one side of the pawl.

[0014] As a preferred embodiment of the experimental self-anchored stress electrochemical corrosion device of the present invention, the sliding rod is provided with a plurality of convex toothed racks, the inner wall of the column is provided with toothed grooves that match the convex toothed racks, a cross-shaped fixing member is connected to the portion of the sliding rod extending above the locking sleeve, and a cross-shaped groove that matches the cross-shaped fixing member is provided on the locking sleeve.

[0015] As a preferred embodiment of the experimental self-anchored stress electrochemical corrosion device of the present invention, wherein: an arc-shaped through groove is provided on the side wall of the sleeve, and the ratchet passes through the arc-shaped through groove and engages with the pawl.

[0016] An experimental method for a self-anchored stress electrochemical corrosion apparatus includes the following steps:

[0017] Step 1: Fix the two support mechanisms onto the test bench;

[0018] Step 2: Place the first specimen, the support, and the second specimen onto the support mechanism in sequence, and lock and fix the upper end of the second specimen.

[0019] Step 3: Place the PVC pipe 301a in the weld area at the middle of the upper end of the second specimen 202, and then use sealant 301b to fix it to the upper end of the second specimen 202 to form an electrolytic cell 301;

[0020] Step 4: Fill the electrolytic cell 301 with NaCl solution, and set up a platinum mesh electrode and an Ag / AgCl (saturated KCl) electrode inside the electrolytic cell 301. Connect the electrodes to the electrochemical workstation through wires for parameter measurement.

[0021] The beneficial effects of the present invention are as follows: By placing the electrolytic cell on the upper end of the specimen and setting supports between the specimens, the present invention can apply four-point bending load to the specimen, so that the upper surface of the pure bending section of the specimen reaches the predetermined tensile stress and maintain the preload for corrosion characteristic testing. Furthermore, by changing different tensile stresses, the corrosion characteristics of the specimen can be tested under different tensile stress conditions, which is highly flexible, has good testing effect, and is easy to use. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0023] Figure 1 This is a schematic diagram of the overall structure of the self-anchoring stress electrochemical corrosion device used in the experiment of this invention.

[0024] Figure 2 This is a front view schematic diagram of the self-anchored stress electrochemical corrosion device used in the experiment of this invention.

[0025] Figure 3 This is a schematic diagram of the specimen assembly structure of the self-anchored stress electrochemical corrosion device used in the experiment of this invention.

[0026] Figure 4 This is a schematic diagram of the support column structure of the self-anchored stress electrochemical corrosion device used in the experiment of this invention.

[0027] Figure 5 This is a schematic diagram of the cross-sectional structure of the support column of the self-anchored stress electrochemical corrosion device used in the experiment of this invention.

[0028] Figure 6 This invention relates to a self-anchoring stress electrochemical corrosion apparatus for experimental use. Figure 5 Enlarged structural diagram of section A;

[0029] Figure 7 This is a schematic diagram of the overall structure of the locking sleeve of the self-anchoring stress electrochemical corrosion device used in the experiment of this invention;

[0030] Figure 8 This is a bottom view of the locking sleeve structure of the self-anchoring stress electrochemical corrosion device used in the experiment of this invention;

[0031] Figure 9 This is a schematic diagram of the column structure of the self-anchoring stress electrochemical corrosion device used in the experiment of this invention;

[0032] Figure 10 This is a schematic diagram of the column cross-sectional structure of the self-anchoring stress electrochemical corrosion device used in the experiment of this invention.

[0033] Figure 11 This is a schematic diagram of the sleeve structure of the self-anchoring stress electrochemical corrosion device used in the experiment of this invention;

[0034] Figure 12 This is a schematic diagram of the connection structure between the sliding rod and the column of the self-anchored stress electrochemical corrosion device used in the experiment of this invention. Detailed Implementation

[0035] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0036] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0037] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0038] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0039] Example 1

[0040] Reference Figure 1-3 The first embodiment of the present invention provides an experimental self-anchored stress electrochemical corrosion device and experimental method, including a support mechanism 100, a specimen assembly 200 sleeved on the support mechanism 100, and an electrolysis mechanism 300 provided at the upper end of the specimen assembly 200. The support mechanism 100 can be used to support the specimen assembly 200, and then the electrolysis mechanism 300 at the upper end of the specimen can be used to electrolytically corrode the specimen.

[0041] Specifically, the support mechanism 100 includes two bases 101, each with a suction cup at its bottom. The suction cups can be used to increase or decrease the stability of the base 101 when placed on the workbench. Each of the two bases 101 has a support column 102 at its upper end, which is used to support the specimen assembly 200. The support column 102 can be a screw, and a nut that matches the screw can be fitted on the support column 102 to limit the movement of the specimen assembly 200.

[0042] Furthermore, the specimen assembly 200 includes a first specimen 201 disposed above the base 101, and a second specimen 202 disposed above the first specimen 201. Both the first specimen 201 and the second specimen 202 are provided with through holes 203. The inner diameter of the through holes 203 is larger than the diameter of the support column 102. Both the first specimen 201 and the second specimen 202 are sleeved on the support column 102 through the through holes 203. The first specimen 201 and the second specimen 202 are steel plate specimens containing butt welds or steel specimens containing fillet welds.

[0043] Specifically, the first specimen 201 and the second specimen 202 are two steel plates with dimensions of 200mm×40mm×10mm.

[0044] Furthermore, two supports 204 are provided between the first specimen 201 and the second specimen 202. Both supports 204 are made of high-strength nylon material to prevent the supports 204 from slipping along the longitudinal direction of the specimen assembly 200. The supports 204 are cylindrical in shape, with a diameter of about 2 to 3 times the thickness of the first specimen 201 or the second specimen 202. The two supports 204 are placed at 50 mm and 150 mm along the long side of the specimen assembly 200, so that the 50 to 150 mm section is a pure bending section when pressure is applied.

[0045] Furthermore, the electrolysis mechanism 300 includes an electrolytic cell 301 disposed on the upper end of the second specimen 202. The electrolytic cell 301 includes a PVC pipe 301a, which is located in the weld area at the middle of the upper end of the second specimen 202. The outer diameter of the PVC pipe 301a is slightly smaller than the width of the second specimen 202. Sealant 301b is filled between the PVC pipe 301a and the second specimen 202. The PVC pipe 301a is fixed in the weld area of ​​the second specimen 202 and forms the electrolytic cell 301, so that the weld is in the weld area. Within the area enclosed by PVC pipe 301a, electrolytic cell 301 is filled with NaCl solution. Electrolytic cell 301 contains a platinum mesh electrode and an Ag / AgCl (saturated KCl) electrode. The platinum mesh electrode serves as the counter electrode 302, and the Ag / AgCl (saturated KCl) electrode serves as the reference electrode 303. The second specimen 202, which contains electrolytic cell 301, serves as the working electrode. These three electrodes can be connected to an electrochemical workstation via wires for parameter measurement, allowing electrons to flow in the solution. Furthermore, insulation treatment is required between the first specimen 201, the second specimen 202, and the support column 102. Insulating material can be applied to the through-holes 203 on the first and second specimens 201 and 202.

[0046] During use, the two bases 101 can be fixed to the corresponding test bench using suction cups. The support column 102 can be a screw rod. Bolt tightening force sensors are mounted on the two screw rods and connected to a computer via wires to display the applied force. Nuts matching the screw rods can be fitted onto the screw rods to limit the movement of the specimen assembly 200. First, the first specimen 201 is placed on the screw rod through the through hole 203. Then, two supports 204 are placed on the first specimen 201. Next, the second specimen 202 is placed on the screw rod through the through hole 203, and then the nut is used to lock and fix the second specimen 202. Simultaneously, an insulating coating is applied to the through hole 203, and an insulating washer is placed at the contact point between the nut and the second specimen 202. At this point, PVC pipe 301a can be placed in the weld area at the middle of the upper end of the second specimen 202. The outer diameter of PVC pipe 301a is slightly smaller than the width of the second specimen 202. Then, sealant 301b is used to fix it to the upper end of the second specimen 202 to form an electrolytic cell 301. NaCl solution is filled in the electrolytic cell 301 to keep the working electrode (i.e., the second specimen 202) exposed to the electrolyte solution. A platinum mesh electrode and an Ag / AgCl (saturated KCl) electrode are set inside the electrolytic cell 301. The platinum mesh electrode is the counter electrode 302, and the Ag / AgCl (saturated KCl) electrode is the reference electrode 303. These three electrodes can be connected to an electrochemical workstation through wires for parameter measurement, that is, electrons are allowed to flow in the solution. The electrolytic cell 301 is equipped with a constant-temperature electric heating element, which is connected to a power source via wires to heat the electrolyte solution to meet the temperature requirements under special corrosion conditions. Then, by adjusting the pressure of the nut on the second specimen 202, the support 204 is deformed, so that the 50-150mm section is a pure bending section when pressure is applied. Four-point bending loading can be applied to the specimen, so that the upper surface of the pure bending section of the second specimen 202 reaches the predetermined tensile stress, and the preload is maintained for corrosion characteristic testing. Furthermore, by changing different tensile stresses, the corrosion characteristics of the second specimen 202 can be tested under different tensile stress conditions, which is highly flexible, has good testing results, and is easy to use.

[0047] Example 2

[0048] Reference Figure 4-10 As shown, this is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the support column 102 includes a column body 102a rotatably mounted on the base 101. The bottom end of the column body 102a is rotatably connected to the base 101 through a bearing sleeve. A sleeve 102b is fitted on the column body 102a. The inner diameter of the sleeve 102b is the same as the outer diameter of the column 102a. A protruding edge is provided on the side wall of the column 102a for supporting and limiting the bottom end of the sleeve 102b.

[0049] Specifically, a vertical guide groove 102b-2 is provided on the outer wall of the sleeve 102b, and a locking sleeve 102c is provided at the top of the column 102a and the sleeve 102b. The inner diameter of the locking sleeve 102c is larger than the outer diameter of the sleeve 102b. A slide bar 102c-4 matching the guide groove 102b-2 is provided on the inner wall of the locking sleeve 102c. The locking sleeve 102c can slide along the guide groove 102b-2 in the vertical direction of the main body and the sleeve 102b through the slide bar 102c-4.

[0050] Furthermore, a support plate 102a-1 for supporting the first specimen 201 is sleeved on the column 102a. The support plate 102a-1 is made of insulating material and is slidably sleeved on the column 102a. Several ratchet teeth 102a-2 are arranged and installed on both sides of the column 102a, which are used to limit the locking sleeve 102c.

[0051] Furthermore, the locking sleeve 102c includes a sleeve body 102c-1, with an upper pressure plate 102c-2 at the top of the sleeve body 102c-1. The upper pressure plate 102c-2 is elliptical in shape and is used to close the top of the sleeve body 102c-1. A lower pressure ring plate 102c-3 is provided around the bottom of the sleeve body 102c-1. The diameter of the lower pressure ring plate 102c-3 is larger than the outer diameter of the sleeve 102b. The lower pressure ring plate 102c-3 is made of insulating material and abuts against the upper surface of the second test piece 202. Pawls 102c-5 matching ratchet teeth 102a-2 are symmetrically hinged on the two inner side walls of the sleeve body 102c-1. A limiting block 102c-6 is provided on one side of the pawl 102c-5. The limiting block 102c-6 is used to limit the pawl 102c-5 and prevent it from flipping downward.

[0052] When the locking sleeve 102c is pressed down, the pawl 102c-5 can move down synchronously to below a set of ratchet teeth 102a-2 and engage with them. At the same time, as the locking sleeve 102c moves down, downward pressure can be applied to the second specimen 202 through the lower pressure ring plate 102c-3. A certain pressure can be applied to the second specimen 202 each time it is pressed, so that the corrosion of the second specimen 202 under different tensile stress conditions can be tested.

[0053] Furthermore, a sliding rod 102a-3 is slidably disposed inside the column 102a. The column 102a is hollow. The top end of the sliding rod 102a-3 passes through the column 102a and the locking sleeve 102c and extends above the locking sleeve 102c. The sliding rod 102a-3 can slide up and down inside the column 102a. A fixing plate 102a-4 is fitted on the portion of the sliding rod 102a-3 inside the locking sleeve 102c. 02a-4 is fixedly connected to the sliding sleeve. A compression spring 102a-5 is provided between the fixed plate 102a-4 and the sliding rod 102a-3. The fixed plate 102a-4 is located at the lower end of the upper pressure plate 102c-2 and abuts against the lower surface of the upper pressure plate 102c-2. When the locking sleeve 102c moves down, it can push the fixed plate 102a-4 down and compress it with the compression spring 102a-5. At the same time as the fixed plate 102a-4 moves down, it pushes the sliding sleeve 102a-3. When the movable rod 102a-3 moves downward, several push rods 102a-6 are hinged to the bottom end of the sliding rod 102a-3. One end of each push rod 102a-6 passes through a through slot 102a-7 opened on the side wall of the column 102a. The part of the push rod 102a-6 extending to the outside of the column 102a is located below the support plate 102a-1 and provides support for the support plate 102a-1. When the sliding rod 102a-3 moves downward, it drives the push rods 102a-6. When one end of the column 102a moves downward, the push rod 102a-6, under the limiting action of the through groove 102a-7, lifts the other end of the column 102a-6 upward and pushes the receiving plate 102a-1 upward, thereby pushing the first specimen 201 upward and shortening the distance between the first specimen 201 and the second specimen 202. This allows for rapid adjustment of the tensile stress on the surface of the second specimen 202, and the operation is simple and easy to use.

[0054] The remaining structure is the same as that in Example 1.

[0055] During operation: When it is necessary to adjust the tensile stress on the surface of the second specimen 202, the locking sleeve 102c can be pressed down. The locking sleeve 102c moves down by the distance of a ratchet 102a-2. At this time, the pawl 102c-5 engages with the ratchet 102a-2. The locking sleeve 102c applies pressure to the upper surface of the second specimen 202 through the lower pressure ring plate 102c-3. The lower surface of the lower pressure ring plate 102c-3 is embedded with a pressure sensor 102c-8, which contacts the upper surface of the second specimen 202. The pressure sensor 102c-8 is connected to a computer through a wire, which facilitates the display of the applied force. This allows for different tensile stresses to be applied to the second specimen 202 by applying different magnitudes of force. As the locking sleeve 102c moves down, it can push the fixing plate 102a-4 down and engage with the compression spring 1. 02a-5 is compressed and contracted, and while the fixed plate 102a-4 moves down, it pushes the sliding rod 102a-3 down. When the sliding rod 102a-3 moves down, it drives the end of the push rod 102a-6 located inside the column 102a to move down. At this time, under the limiting action of the through groove 102a-7, the end of the push rod 102a-6 located outside the column 102a is lifted up and pushes the receiving plate 102a-1 to move up, thereby pushing the first specimen 201 to move up, so that the distance between the first specimen 201 and the second specimen 202 is shortened. This allows for rapid adjustment of the tensile stress on the surface of the second specimen 202. The operation is simple and easy to use. Each press of the locking sleeve 102c can achieve short-distance bidirectional movement of the first specimen 201 and the second specimen 202, which facilitates rapid adjustment of the tensile stress on the surface of the specimen and is easy to use.

[0056] Example 3

[0057] Reference Figure 7 , Figure 9 , Figure 11 , Figure 12This is the third embodiment of the present invention, which differs from the second embodiment in that: the sliding rod 102a-3 is provided with a plurality of protruding racks 102a-9, and the inner wall of the column 102a is provided with toothed grooves 102a-8 that match the protruding racks 102a-9. The sliding rod 102a-3 can slide up and down inside the column 102a through the protruding racks 102a-9 along the toothed grooves 102a-8. At the same time, when the sliding rod 102a-3 rotates, it can drive the column 102a to rotate synchronously. The sliding rod 102a-3 extends... A cross-shaped fixing member 102a-3a is connected to the part above the locking sleeve 102c. The cross-shaped fixing member 102a-3a can increase the contact area between the hand and the sliding rod 102a-3, making it easier to rotate the sliding rod 102a-3. The locking sleeve 102c has a cross groove 102c-7 that matches the cross-shaped fixing member 102a-3a. The sliding rod 102a-3 can pass through the cross groove 102c-7 and slide to connect with the locking sleeve 102c. At the same time, the locking sleeve 102c can be disassembled and separated.

[0058] Furthermore, an arc-shaped through groove 102b-1 is provided on the side wall of the sleeve 102b. The area of ​​the arc-shaped through groove 102b-1 is one-eighth of the surface area of ​​the sleeve 102b. The ratchet 102a-2 passes through the arc-shaped through groove 102b-1 and engages with the pawl 102c-5. When it is necessary to separate the ratchet 102a-2 from the pawl 102c-5, the sliding rod 102a-3 can be rotated, causing the sliding rod 102a-3 to rotate and drive the column 102a to rotate. This allows the ratchet 102a-2 to move 45 degrees along the inside of the arc-shaped through groove 102b-1, thereby separating the ratchet 102a-2 from the pawl 102c-5.

[0059] The remaining structure is the same as that in Example 2.

[0060] During operation: When it is necessary to disassemble and separate the first test piece 201 and the second test piece 202, the sliding rod 102a-3 can be rotated by operating the cross fixing part 102a-3a. This causes the sliding rod 102a-3 to rotate and drive the column 102a to rotate, so that the ratchet 102a-2 moves 45 degrees along the inside of the arc-shaped through groove 102b-1, and the ratchet 102a-2 separates from the pawl 102c-5. At this time, under the elastic force of the compression spring 102a-5, the locking sleeve 102c is pushed upward, and then the locking sleeve 102c can be disassembled. Then the first test piece 201 and the second test piece 202 can be disassembled in sequence. The operation is simple and easy to replace the test pieces.

[0061] Example 4

[0062] This is the fourth embodiment of the present invention. Unlike the previous embodiment, this embodiment provides an experimental method for a self-anchoring stress electrochemical corrosion apparatus, comprising the following steps:

[0063] Step 1: Fix the two support mechanisms 100 onto the test bench;

[0064] Step 2: Place the first specimen 201, the support 204, and the second specimen 202 onto the support mechanism 100 in sequence, and lock and fix the upper end of the second specimen 202.

[0065] Step 3: Place the PVC pipe 301a in the weld area at the middle of the upper end of the second specimen 202, and then use sealant 301b to fix it to the upper end of the second specimen 202 to form an electrolytic cell 301;

[0066] Step 4: Fill the electrolytic cell 301 with NaCl solution, and set up a counter electrode 302 and a reference electrode 303 inside the electrolytic cell 301. Connect the counter electrode 302 and the reference electrode 303 to the electrochemical workstation through wires for parameter measurement.

[0067] Specifically, in step one, the two support mechanisms 100 can be fixed to the corresponding test bench by suction cups on the base 101. At this time, the support column 102 can be a screw. Bolt tightening force sensors are installed on the two screws respectively, and they are connected to the computer through wires to facilitate the display of the applied force.

[0068] Furthermore, in step two, the first test piece 201, the support 204, and the second test piece 202 are sequentially fitted onto the screw, and a nut matching the screw is assembled on the screw to limit the second test piece 202. At the same time, an insulating coating is applied to the through holes 203 on the first test piece 201 and the second test piece 202, and an insulating washer is placed at the position where the nut contacts the second test piece 202.

[0069] Furthermore, in step three, the outer diameter of the PVC pipe 301a is slightly smaller than the width of the second specimen 202. Then, sealant 301b is used to fill the outer periphery of the PVC pipe 301a, fixing the PVC pipe 301a to the upper end of the second specimen 202 and forming an electrolytic cell 301.

[0070] Furthermore, in step four, NaCl solution is filled into electrolytic cell 301 to keep the working electrode (i.e., the second specimen 202) exposed to the electrolyte solution. The counter electrode 302 is a platinum mesh electrode, and the reference electrode 303 is an Ag / AgCl (saturated KCl) electrode. These three electrodes can be connected to an electrochemical workstation via wires for parameter measurement, thus allowing electrons to flow in the solution. Electrolytic cell 301 is equipped with a constant-temperature electric heating element, which is connected to a power source via wires to heat the electrolyte solution to meet the temperature requirements under special corrosion conditions.

[0071] Then, by adjusting the pressure of the nut on the second specimen 202, the support 204 is deformed, so that the 50-150mm section is a pure bending section when pressure is applied. The specimen can be subjected to four-point bending loading, so that the upper surface of the pure bending section of the second specimen 202 reaches the predetermined tensile stress, and the corrosion characteristics test is carried out under the preload. Furthermore, by changing different tensile stresses, the corrosion characteristics of the second specimen 202 can be tested under different tensile stress conditions. It is highly flexible, has good test results, and is easy to use.

[0072] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0073] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0074] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An experimental self-anchoring stress electrochemical corrosion device, characterized in that: include, Support mechanism (100), specimen assembly (200) disposed on the support mechanism (100), and electrolysis mechanism (300) disposed on the upper end of the specimen assembly (200). The support mechanism (100) includes two bases (101), and each of the two bases (101) has a support column (102) at its upper end, which is used to support the specimen assembly (200). The support column (102) includes a column (102a) rotatably mounted on the base (101), a sleeve (102b) sleeved on the column (102a), a guide groove (102b-2) on the side wall of the sleeve (102b), a locking sleeve (102c) at the top of the column (102a) and the sleeve (102b), and a slide bar (102c-4) matching the guide groove (102b-2) on the inner wall of the locking sleeve (102c). Several ratchet teeth (102a-2) are arranged on both sides of the column (102a) for limiting the locking sleeve (102c). The locking sleeve (102c) slides along the guide groove (102b-2) in the vertical direction of the main body and the sleeve (102b) via the slide bar (102c-4). The specimen assembly (200) includes a first specimen (201) disposed above the base (101) and a second specimen (202) disposed above the first specimen (201). A support plate (102a-1) for supporting the first specimen (201) is fitted onto the column (102a). A sliding rod (102a-3) is slidably disposed inside the column (102a). The top end of the sliding rod (102a-3) passes through the column (102a) and the locking sleeve (102c) and extends above the locking sleeve (102c). A fixing plate (102a-4) is fitted onto the portion of the sliding rod (102a-3) inside the locking sleeve (102c). A compression spring (102a-5) is provided between the fixed plate (102a-4) and the sliding rod (102a-3). Several push rods (102a-6) are hinged to the bottom end of the sliding rod (102a-3). One end of the push rod (102a-6) passes through a through groove (102a-7) opened on the side wall of the column (102a). The push rod (102a-6) is located below the receiving plate (102a-1) and provides support to the receiving plate (102a-1). The sliding rod (102a-3) is provided with a plurality of protruding toothed racks (102a-9), and the inner wall of the column (102a) is provided with toothed grooves (102a-8) that match the protruding toothed racks (102a-9). A cross-shaped fixing member (102a-3a) is connected to the portion of the sliding rod (102a-3) that extends above the locking sleeve (102c). A cross-shaped groove (102c-7) that matches the cross-shaped fixing member (102a-3a) is provided on the locking sleeve (102c). An arc-shaped through groove (102b-1) is provided on the side wall of the sleeve (102b), and the ratchet (102a-2) passes through the arc-shaped through groove (102b-1) and engages with the pawl (102c-5) on the locking sleeve (102c); Two supports (204) are provided between the first specimen (201) and the second specimen (202). Both supports (204) are made of high-strength nylon material to prevent the supports (204) from sliding along the longitudinal direction of the specimen assembly (200). The electrolysis mechanism (300) includes an electrolytic cell (301) disposed on the upper end of the second specimen (202), a counter electrode (302) disposed inside the electrolytic cell (301), and a reference electrode (303) disposed inside the electrolytic cell (301).

2. The experimental self-anchoring stress electrochemical corrosion device according to claim 1, characterized in that: Both the first specimen (201) and the second specimen (202) have through holes (203), and both the first specimen (201) and the second specimen (202) are fitted onto the support column (102) through the through holes (203).

3. The experimental self-anchoring stress electrochemical corrosion apparatus according to claim 1 or 2, characterized in that: The electrolytic cell (301) includes a PVC pipe (301a), which is located at the upper middle part of the second specimen (202), and the space between the PVC pipe (301a) and the second specimen (202) is filled with sealant (301b).

4. The experimental self-anchoring stress electrochemical corrosion device according to claim 3, characterized in that: The counter electrode (302) is a platinum mesh electrode, and the reference electrode (303) is an Ag / AgCl (saturated KCl) electrode.

5. The experimental self-anchoring stress electrochemical corrosion apparatus according to claim 1 or 4, characterized in that: The locking sleeve (102c) includes a sleeve body (102c-1), an upper pressure plate (102c-2) at the top of the sleeve body (102c-1), a lower pressure ring plate (102c-3) at the bottom of the sleeve body (102c-1), the lower pressure ring plate (102c-3) abutting against the upper surface of the second test piece (202), a pawl (102c-5) matching the ratchet tooth (102a-2) is hinged on the inner wall of the sleeve body (102c-1), and a limiting block (102c-6) is provided on one side of the pawl (102c-5).

6. An experimental method for a self-anchoring stress electrochemical corrosion apparatus, characterized in that, The experimental self-anchoring stress electrochemical corrosion apparatus according to any one of claims 3 to 5 includes the following steps: Step 1: Fix the two support mechanisms (100) onto the test bench; Step 2: Place the first test piece (201), the support (204), and the second test piece (202) onto the support mechanism (100) in sequence, and lock and fix the upper end of the second test piece (202); Step 3: Place the PVC pipe (301a) in the weld area at the middle of the upper end of the second specimen (202), and then use sealant (301b) to fix it to the upper end of the second specimen (202) to form an electrolytic cell (301). Step 4: Fill the electrolytic cell (301) with NaCl solution, and set up a counter electrode (302) and a reference electrode (303) inside the electrolytic cell (301). Connect the counter electrode (302) and the reference electrode (303) to the electrochemical workstation through wires for parameter measurement.

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