Portable local electrochemical accelerated corrosion device for shear span and steel beam corrosion system

Abstract

A portable local electrochemical accelerated corrosion device for shear span sections and a steel beam corrosion system, the device is a rectangular corrosion trough 1, including a plastic trough frame, a short plastic block 7 and a long plastic strip 6. The corrosion trough is a double-layer composite bottom, provided with a rectangular trough into which the short plastic block and the long plastic strip can be inserted; a horizontal baffle 4 is installed on the upper part of the corrosion trough, a door-type plastic plate 2 with hinges 5 is installed at both ends of the corrosion trough, and bolt holes 3 are glued to the middle of the four corners of the corrosion trough, and the bolt holes can be inserted into a threaded slider 9. The system includes a steel beam to be corroded, a DC power supply, a stainless steel plate, a support block for supporting the corroded beam, a rubber basin, a pad for supporting the corrosion device and a corrosion trough. The present invention provides a portable local electrochemical accelerated corrosion device for shear span sections and a steel beam corrosion system for steel beams, and can provide a good anti-leakage effect when local corrosion occurs in the shear span section of the steel beam. When the corrosion length changes, it can be extended to achieve adjustable length and good portability.

Description

Technical Field

[0001] The invention relates to a portable shear span local electrochemical accelerated corrosion device and a steel beam corrosion system, belonging to the technical field of electrochemical corrosion testing. Background Art

[0002] Steel structures in harsh environments such as salt lakes are prone to aging and shedding of anti-corrosion coatings. Under certain conditions, electrochemical corrosion will occur, affecting the service life and safety of the structure. Due to the leakage of rainwater, changes in the environment and position of the structure, local corrosion of the shear span is a typical corrosion condition of steel beams. Therefore, for steel structures with a long service life, the durability problems caused by corrosion problems deserve attention. At present, it is a common method to study the mechanical degradation behavior of corroded steel beams through electrochemical accelerated corrosion tests.

[0003] The existing local corrosion device for shear span section is generally made of multiple wooden boards or plastic boards, which are cut and pasted to form corrosion grooves, and waterproof glue is applied to each edge. However, the integrity of this corrosion device is poor, and the waterproof glue has poor water-stopping effect, which leads to an increase in the frequency of replenishing the corrosion solution during the test. In addition, this corrosion device is disposable and cannot be used when the corrosion length changes, resulting in a waste of materials. Summary of the invention

[0004] The purpose of the present invention is to solve many problems existing in the existing shear span local corrosion devices and to propose a portable shear span local electrochemical accelerated corrosion device and a steel beam corrosion system.

[0005] The technical scheme implemented by the present invention is as follows: a portable local electrochemical accelerated corrosion device for shear span sections, the device is a rectangular corrosion tank, including a plastic tank frame, a short plastic block and a long plastic strip; the plastic tank frame is a U-shaped structure composed of three surfaces; the middle surface of the plastic tank frame is placed on a horizontal plane as the bottom, and the two opposite vertical surfaces are tank frame wall panels; the upper part between the front and rear tank frame wall panels is installed and fixed by a cross baffle; the bottom of the plastic tank frame is a double-layer composite bottom; the double-layer composite bottom is provided with two first rectangular grooves and a plurality of second rectangular grooves that are parallel to each other and penetrate at both ends in the horizontal direction; the two first rectangular grooves are respectively close to each other. The front and rear slot frame wall panels have rectangular slots with the same cross-sectional dimensions as the long plastic strips, and the long plastic strips can be inserted into the first rectangular slots from both ends; a plurality of second rectangular slots are distributed between the two first rectangular slots, and the cross-sectional dimensions of the second rectangular slots are the same as the cross-sectional dimensions of the short plastic blocks; two screw holes are preset at 1 / 3 of the distance from the end in the length direction of the center line of the bottom of the slot, and the short plastic blocks can be inserted into the second rectangular slots from both ends and fixed in the slots with bolts; an openable and closable door-type plastic panel is installed on the slot frame wall panel between the cross baffle and the upper bottom of the double-layer composite bottom; bolt holes are glued in the middle of the four corners of the plastic slot frame, and threaded sliders can be inserted into the bolt holes.

[0006] A buckle ring is arranged in the middle of the door-type plastic plate, and the door-type plastic plate is tightly connected by a nylon rope with a hook.

[0007] The two ends of the transverse baffle at the top of the plastic trough frame are provided with 90° angles, and the angles are provided with bolt holes; the transverse baffle is fastened to the trough frame wall plate of the corrosion trough by bolts.

[0008] The short plastic block is provided with a screw hole at 1 / 3 of its length direction, and its position corresponds to the screw hole at the bottom of the second rectangular groove; after the short plastic block is inserted into the second rectangular groove, it is fixed by bolt connection.

[0009] The invention discloses a steel beam accelerated corrosion test system constructed by a portable shear span section local electrochemical accelerated corrosion device, the system comprises a steel beam to be corroded, a direct current power supply, a stainless steel plate, a support block for supporting the corroded beam, a rubber basin, a pad for supporting the corrosion device and a corrosion tank; a door-type plastic plate of the corrosion tank is opened, and the steel beam to be corroded is inserted from the corrosion tank; both ends of the steel beam are padded with support blocks; a pad and a rubber basin are placed at the bottom of the corrosion tank; the stainless steel plate is inserted into the corrosion tank from above; the positive electrode of the direct current power supply is connected to the steel beam to be corroded through a wire, and the negative electrode is connected to the stainless steel plate immersed in a NaCl solution through a wire; the connection between the corrosion tank and the steel beam is sealed with a waterproof strip; the NaCl solution is injected into the corrosion tank so that the stainless steel plate and the part to be corroded of the steel beam are immersed.

[0010] A portable method for accelerating local electrochemical corrosion of shear span segments, the steps are as follows:

[0011] (1) According to the required shear span length of the newly corroded steel beam, a corrosion trough for extension is made so that the original length plus the new length equals the length of the section to be corroded;

[0012] (2) Loosen the bolts, unscrew the hinges, remove the door-type plastic panels and cross baffles, and install the two corrosion troughs on the shear span section of the newly corroded steel beam;

[0013] (3) Insert the short plastic block into the middle of the two corrosion grooves and the long plastic strip into the ends to achieve the preliminary splicing of the two corrosion grooves;

[0014] (4) Insert the threaded slider into the bolt holes of the two corrosion grooves; tighten the bolts of the short plastic block and the slider, and connect the screw holes of the cross baffle with stainless steel sheet bolts, finally forming a firm corrosion device, thus realizing the extension of the corrosion device;

[0015] (5) Close the door-type plastic plates at both ends of the new corrosion device, and use a nylon rope with a hook to tightly connect the buckles of the door-type plastic plates at both ends. Under the action of water pressure, the nylon rope can also achieve internal force balance, reducing the force on the door-type plastic plates and hinges;

[0016] (6) Seal all joints with waterproof strips to prevent corrosion solution from leaking;

[0017] (7) Place a rectangular rubber basin under the new corrosion tank to hold the corrosion solution that may leak or replace the corrosion solution; place a pad on the rubber basin for support to prevent the shear span section from being subjected to excessive water gravity when the corrosion length is too long;

[0018] (8) Insert the stainless steel plate into the corrosion tank, connect the positive electrode of the DC power supply to the steel beam to be corroded through a wire, and connect the negative electrode of the DC power supply to the stainless steel plate through a wire;

[0019] (9) Inject NaCl solution into the corrosion tank, turn on the power, and conduct a corrosion test.

[0020] The stainless steel plate is placed in the corrosion tank to ensure that the stainless steel plate does not contact the steel beam.

[0021] A 5% NaCl solution was added to the corrosion tank to a height of half the height of the cross baffle.

[0022] The current of the DC power supply is adjusted to 1880 mA, and the duration of the corrosion current is estimated. The corresponding estimation formula is expressed as:

[0023]

[0024] In the formula, e is the electron charge; N is Avogadro's constant; is the initial mass of the steel beam; m The quality of the steel beam after corrosion; I The corrosion current.

[0025] The beneficial effect of the present invention is that the door-type plastic plate of the corrosion trough in the device of the present invention is arranged in the form of a hinge, which is conducive to the placement of the steel beam and has good airtightness; the nylon rope on the hinge realizes self-balancing of force under the action of water pressure and also ensures the tightness of the hinge. When the corrosion length of the shear span section changes, the corrosion system can be made firm and the corrosion length can be changed through the long plastic strip at the bottom of the corrosion trough and the short plastic block that can be tightened, the bolt hole in the middle of the corrosion trough and the tightened slider, and the stainless steel sheet with screw holes at the top of the corrosion trough and the web bolts of the corrosion trough. The rectangular rubber basin at the bottom of the corrosion trough can receive the corrosion solution that may leak and be used to hold the corrosion solution when it is replaced, ensuring the cleanliness of the site and equipment and easy cleaning; the pad in the rubber basin can provide a certain support force, reduce the force on the corrosion trough, and ensure the stability of the corrosion device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of the electrochemical accelerated corrosion device of the present invention;

[0027] Figure 2 This is a schematic diagram of the bottom of the electrochemical accelerated corrosion device of the present invention;

[0028] Figure 3 It is a schematic diagram of the corrosion tank structure;

[0029] Figure 4 It is a structural diagram of a short plastic block;

[0030] Figure 5 This is the structural diagram of the cross baffle and the screw hole steel sheet;

[0031] Figure 6 This is a structural diagram of the portable steel beam shear span local corrosion system of the present invention.

[0032] In the figure: 1 is a corrosion groove; 2 is a door-type plastic plate; 3 is a bolt hole; 4 is a horizontal baffle; 5 is a hinge; 6 is a long plastic strip; 7 is a short plastic block; 8 is a nylon rope; 9 is a slider; 10 is a waterproof strip; 11 is a screw hole steel sheet; 12 is a steel beam; 13 is a DC power supply; 14 is a stainless steel plate; 15 is a wire; 16 is a NaCl solution; 17 is a support block; 18 is a rubber basin; 19 is a cushion block. DETAILED DESCRIPTION

[0033] The specific embodiments of the present invention are as follows Figure 1 and Figure 6 shown.

[0034] This embodiment is a portable shear span local electrochemical accelerated corrosion device, such as Figure 1 and Figure 2 As shown, the device is a rectangular corrosion tank 1, including a plastic tank frame, a short plastic block 7 and a long plastic strip 6. Figure 3 The plastic trough frame is a U-shaped structure consisting of three surfaces; the middle surface of the plastic trough frame is placed on a horizontal plane as the bottom, and the two opposite vertical surfaces are trough frame wall panels; the upper part between the front and rear trough frame wall panels is fixed with a horizontal baffle 4, as shown in FIG. Figure 5 As shown; the bottom of the plastic trough frame is a double-layer composite bottom, such as Figure 3 As shown; the double-layer composite bottom is provided with two first rectangular grooves and a plurality of second rectangular grooves which are parallel to each other and penetrate through both ends in the horizontal direction; the two first rectangular grooves are respectively close to the front and rear groove frame wall panels, and the cross-section of the rectangular grooves is the same as the cross-section size of the long plastic strip 6, and the long plastic strip 6 can be inserted into the first rectangular groove from both ends; the plurality of second rectangular grooves are distributed between the two first rectangular grooves, and the cross-section of the second rectangular groove is the same as the cross-section size of the short plastic block 7, and two screw holes are preset at 1 / 3 of the end in the length direction of the center line of the bottom of the groove, and the short plastic block 7 can be inserted into the second rectangular groove from both ends and fixed in the groove with bolts, as shown in FIG. Figure 4As shown; a door-type plastic plate 2 that can be opened and closed is installed on the groove frame wall plate between the horizontal baffle 4 and the upper bottom of the double-layer composite bottom; bolt holes 3 are glued in the middle of the four corners of the plastic groove frame, and the bolt holes can be inserted into the threaded slider 9. The door-type plastic plate is installed on the groove frame wall plate through hinges, and a buckle is provided in the middle of the door-type plastic plate 2. The door-type plastic plate is tightly connected with a nylon rope 8 with a hook.

[0035] like Figure 6 As shown, the present embodiment is a steel beam accelerated corrosion test system constructed by a portable shear span local electrochemical accelerated corrosion device, comprising a steel beam to be corroded 12, a DC power supply 13, a stainless steel plate 14, a support block 17 for supporting the corroded beam, a rubber basin 18, a pad 19 for supporting the corrosion device and a corrosion tank 1.

[0036] Open the door-type plastic plate of the corrosion tank, and insert the steel beam 12 to be corroded from the corrosion tank; the two ends of the steel beam are raised with support blocks; pads and rubber basins are placed at the bottom of the corrosion tank; the stainless steel plate is inserted into the corrosion tank from above, and the connection between the corrosion tank and the steel beam is sealed with a waterproof strip 10, and NaCl solution 16 is injected into the corrosion tank; the positive electrode of the DC power supply is connected to the steel beam to be corroded through a wire, and the negative electrode is connected to the stainless steel plate immersed in the NaCl solution 16 through a wire.

[0037] This embodiment provides a portable shear span local electrochemical accelerated corrosion method, comprising the following steps:

[0038] (a) According to the required shear span length of the new corroded beam, a corrosion groove is made for extension, so that the length of the original corrosion groove plus the length of the new corrosion groove equals the length of the section to be corroded;

[0039] (b) Loosen the bolts, unscrew the hinges, remove the door-type plastic panels and cross baffles, and install them at both ends of the new corrosion device;

[0040] (c) Insert the short plastic block into the middle of the two corrosion grooves and the long plastic strip into the ends to achieve the preliminary splicing of the two corrosion grooves;

[0041] (d) Insert the threaded slider into the bolt holes of the two corrosion grooves. Tighten the bolts of the short plastic block and the slider, and connect the screw holes of the cross baffle with stainless steel bolts to finally form a firm corrosion device, thus realizing the extension of the corrosion device;

[0042] (e) Close the door-type plastic plates at both ends of the new corrosion device, and use a nylon rope with a hook to tightly connect the buckles of the door-type plastic plates at both ends. Under the action of water pressure, the nylon rope can also achieve internal force balance, reducing the force on the door-type plastic plates and hinges;

[0043] (f) All joints are sealed with waterproof strips to prevent corrosion solution from leaking;

[0044] (g) Place a rectangular rubber basin under the new corrosion trough to hold the corrosion solution that may leak or replace the corrosion solution; place pads on the rubber basin to support the corrosion trough to prevent the corrosion trough from being subjected to excessive water gravity when the shear span corrosion length is too long.

[0045] At the same time, this embodiment also provides a control method for the electrochemical accelerated corrosion system, which is as follows:

[0046] (a) Use a wire to connect the positive electrode of the DC power supply to the steel beam to be corroded, and the negative electrode of the DC power supply to the stainless steel plate;

[0047] (b) Place the stainless steel plate in the corrosion tank, making sure that the stainless steel plate does not contact the steel beam;

[0048] (c) Add 5% NaCl solution to the corrosion tank to half the height of the cross baffle;

[0049] (d) Adjust the current of the DC power supply to 1880mA and apply Faraday's law to estimate the duration of the corrosion current. The corresponding estimation formula can be expressed as:

[0050] (1)

[0051] in: e is the electron charge; N is Avogadro's constant; is the initial mass of the beam; m is the quality of the beam after corrosion; I The corrosion current.

Claims

1. A portable shear span local electrochemical accelerated corrosion method of a portable shear span local electrochemical accelerated corrosion device, characterized in that: The device is a rectangular corrosion tank, including a plastic tank frame, a short plastic block and a long plastic strip; the plastic tank frame is a U-shaped structure composed of three surfaces; the plastic tank frame is placed on a horizontal plane with a middle surface as the bottom, and two opposite vertical surfaces are tank frame wall panels; the upper part between the front and rear tank frame wall panels is fixed by a transverse baffle; the bottom of the plastic tank frame is a double-layer composite bottom; the double-layer composite bottom is provided with two first rectangular grooves and a plurality of second rectangular grooves that are parallel to each other and penetrate at both ends in the horizontal direction; the two first rectangular grooves are respectively close to the front and rear tank frame wall panels, and the cross-section of the rectangular grooves is the same as the cross-section size of the long plastic strip, and the long plastic strip can be inserted into the first rectangular grooves from both ends; A plurality of second rectangular grooves are distributed between the two first rectangular grooves, the cross section of the second rectangular grooves is the same as the cross section of the short plastic block, two screw holes are preset at 1 / 3 of the distance from the end in the length direction of the center line of the bottom of the groove, and the short plastic block can be inserted into the second rectangular groove from both ends and fixed in the groove by bolts; a door-type plastic plate that can be opened and closed is installed on the groove frame wall plate between the cross baffle and the upper bottom of the double-layer composite bottom; bolt holes are glued in the middle of the four corners of the plastic groove frame, and the bolt holes can be inserted into the slider with a thread; The invention also includes a steel beam to be corroded, a direct current power supply, a stainless steel plate, a support block for supporting the corroded beam, a rubber basin, a pad for supporting the corrosion device, and a corrosion tank; a door-type plastic plate of the corrosion tank is opened, and the steel beam to be corroded is inserted into the corrosion tank; both ends of the steel beam are raised with support blocks; pads and a rubber basin are placed at the bottom of the corrosion tank; the stainless steel plate is inserted into the corrosion tank from above; the positive electrode of the direct current power supply is connected to the steel beam to be corroded through a wire, and the negative electrode is connected to the stainless steel plate through a wire; the connection between the corrosion tank and the steel beam is sealed with a waterproof strip; a NaCl solution is injected into the corrosion tank so that the stainless steel plate and the part of the steel beam to be corroded are immersed; The method steps are as follows: (1) According to the required shear span length of the newly corroded steel beam, a corrosion trough for extension is made so that the original length plus the new length equals the length of the section to be corroded; (2) Loosen the bolts, unscrew the hinges, remove the door-type plastic panels and cross baffles, and install the two corrosion troughs on the shear span section of the newly corroded steel beam; (3) Insert the short plastic block into the middle of the two corrosion grooves and the long plastic strip into the ends to achieve the preliminary splicing of the two corrosion grooves; (4) Insert the threaded slider into the bolt holes of the two corrosion grooves; tighten the bolts of the short plastic block and the slider, and connect the screw holes of the cross baffle with stainless steel sheet bolts, finally forming a firm corrosion device, thus realizing the extension of the corrosion device; (5) Close the door-type plastic plates at both ends of the new corrosion device, and use a nylon rope with a hook to tightly connect the buckles of the door-type plastic plates at both ends. Under the action of water pressure, the nylon rope can also achieve internal force balance, reducing the force on the door-type plastic plates and hinges; (6) Seal all joints with waterproof strips to prevent corrosion solution from leaking; (7) Place a rectangular rubber basin under the new corrosion tank to hold the corrosion solution that may leak or replace the corrosion solution; place a pad on the rubber basin for support to prevent the shear span section from being subjected to excessive water gravity when the corrosion length is too long; (8) Insert the stainless steel plate into the corrosion tank, connect the positive electrode of the DC power supply to the steel beam to be corroded through a wire, and connect the negative electrode of the DC power supply to the stainless steel plate through a wire; (9) Inject NaCl solution into the corrosion tank, turn on the power, and conduct a corrosion test.

2. The portable shear span local electrochemical accelerated corrosion method of the portable shear span local electrochemical accelerated corrosion device according to claim 1, characterized in that: The door-type plastic plate is installed on the groove frame wall plate through hinges, a buckle is provided in the middle of the door-type plastic plate, and the door-type plastic plate is tightly connected by a nylon rope with a hook.

3. The portable shear span local electrochemical accelerated corrosion method of the portable shear span local electrochemical accelerated corrosion device according to claim 1, characterized in that: The two ends of the transverse baffle at the top of the plastic trough frame are provided with 90° angles, and the angles are provided with bolt holes; the transverse baffle is fastened to the trough frame wall plate of the corrosion trough by bolts.

4. The portable shear span local electrochemical accelerated corrosion method of the portable shear span local electrochemical accelerated corrosion device according to claim 1, characterized in that: The short plastic block is provided with a screw hole at 1 / 3 of its length direction, and its position corresponds to the screw hole at the bottom of the second rectangular groove; after the short plastic block is inserted into the second rectangular groove, it is fixed by bolt connection.

5. The portable shear span local electrochemical accelerated corrosion method of the portable shear span local electrochemical accelerated corrosion device according to claim 1, characterized in that: The stainless steel plate is placed in the corrosion tank to ensure that the stainless steel plate does not contact the steel beam.

6. The portable shear span local electrochemical accelerated corrosion method of the portable shear span local electrochemical accelerated corrosion device according to claim 1, characterized in that: A 5% NaCl solution was added to the corrosion tank to a height of half the height of the cross baffle.

7. The portable shear span local electrochemical accelerated corrosion method of the portable shear span local electrochemical accelerated corrosion device according to claim 1, characterized in that: The current of the DC power supply is adjusted to 1880 mA, and the duration of the corrosion current is estimated. The corresponding estimation formula is expressed as: ； In the formula, e is the electron charge; N is Avogadro's constant; is the initial mass of the steel beam; m The quality of the steel beam after corrosion; I The corrosion current.

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