Edge sealing device for salt spray test sample and salt spray test method

Abstract

The invention relates to the technical field of metal material tests, in particular to an edge sealing device for a salt spray test sample and a salt spray test method. The device comprises a base, an upper cover and a support, the support is installed on the base and provided with a vertical motor lead screw guide rail, the upper cover is rigidly connected with a guide rail sliding block, and the bottom is provided with a sealing cutting edge, a template is arranged on the base corresponding to the sealing cutting edge, a groove is formed in the top of the template, the opening shape of the groove is matched with the sealing cutting edge, and the outer wall of the sealing cutting edge is attached to the inner wall of the groove when the sealing cutting edge falls to the working position. According to the device, automatic edge sealing driving is achieved through the motor lead screw, four-side edge sealing is completed through one-time action, time is greatly shortened, the cutting edges are tightly attached to the groove body, salt mist is prevented from permeating from the edges, and it is guaranteed that the test result is accurate.

Description

Technical Field

[0001] This invention relates to the field of metal material testing technology, and in particular to a sealing device for salt spray test specimens and a salt spray test method. Background Technology

[0002] The corrosion resistance of automotive steel, appliance panels, various coatings, and paint films is a crucial testing item, frequently employing salt spray test chambers for salt spray corrosion, cyclic corrosion, and damp heat tests. Before testing, samples must be cut to the required size. To prevent the sample edges from affecting the corrosion test, they must be sealed. Common practices involve sealing the samples with tape or paraffin wax. However, paraffin wax requires pre-melting and is difficult to remove after the test; tape requires manual application, which is time-consuming and inefficient for large sample volumes. Therefore, there is an urgent need for a simple, fast-operating sealing device adaptable to different sample sizes to meet the high-throughput testing needs of modern laboratories. Summary of the Invention

[0003] To address the problem of low edge-sealing efficiency in existing technologies, this invention provides an edge-sealing device and a salt spray testing method for salt spray test specimens. Therefore, the present invention provides the following technical solution: A sealing device for salt spray test specimens includes a base, a top cover, and a bracket. The bracket is mounted on the base, and a motor lead screw guide rail is mounted on the bracket along the vertical direction. The top cover is rigidly connected to a slider of the motor lead screw guide rail. A sealing blade is installed at the bottom of the top cover, and the sealing blade forms a rectangular structure on all four sides along the horizontal direction. A template is installed on the base, directly below the rectangular structure formed by the sealing blade. A groove is opened at the top of the template, and the shape of the top opening of the groove matches the rectangular structure formed by the sealing blade. When the sealing blade falls to the working position with the top cover, the outer wall of the sealing blade can fit against the inner wall of the template groove.

[0004] Furthermore, the rectangular structure formed by the sealing blades has a horizontal cross-sectional area that gradually decreases from top to bottom; each sealing blade constituting the rectangular frame is inclined towards the center of the rectangle relative to the vertical direction at an angle of 30°.

[0005] Furthermore, a base plate is fixedly mounted on the base, and a positioning groove is provided on the base plate; the edge of the template extends outward to form an extension, which overlaps the edge of the positioning groove on the base plate and is connected to the base plate by bolts.

[0006] Furthermore, horizontal guide grooves are symmetrically provided on both sides of the upper cover, and limit blocks are slidably assembled in the horizontal guide grooves; a first spring is connected between the limit block and the inner wall of the corresponding side of the upper cover; a housing is symmetrically installed on the base at the positions on both sides of the template, and a pressure rod is hinged to the housing through a pivot, and a second spring is vertically connected between the pressure rod and the lower wall of the housing; one end of the pressure rod extends to the outside of the housing to form an operating end, and the other end is hinged to one end of the first connecting rod through a pivot; the other end of the first connecting rod is hinged to the lower end of the second connecting rod through a pivot; a vertical guide groove is provided on the top of the housing, and the second connecting rod is adapted to pass through the vertical guide groove and can slide up and down along the vertical guide groove; a limit groove is provided on the side wall of the second connecting rod facing the limit block.

[0007] Furthermore, the upper end face of the second connecting rod and the lower end face of the limiting block are respectively provided with matching inclined surfaces.

[0008] Furthermore, the bracket and the base are rotatably connected by a pivot. The sidewalls of the bracket and the base near the connection point are bolted with the same ear plate, which has an angle adjustment hole. Two guide plates are installed on the slider of the motor screw guide rail, and guide strip holes are opened on the same side of the two guide plates facing each other. The same support limiting plate is horizontally installed at the bottom of the two guide plates, and the support limiting plate is located below the upper cover. On the two side walls of the upper cover, corresponding to the guide strip holes, the upper cover pivot is provided. The upper cover pivot is embedded in the guide strip holes and can slide along the length of the holes.

[0009] Furthermore, the substrate is provided with positioning holes, and the template is provided with positioning pins corresponding to the positioning holes.

[0010] A salt spray test method implemented by a sealing device for salt spray test specimens includes the following steps: wiping the device with anhydrous ethanol using a lint-free cloth; immersing the specimen in ethanol with a concentration of 95%-99% for 10-20 minutes. Rinse the soaked sample with deionized water for 2-5 minutes; After cleaning, place the sample in an oven to dry at a temperature of 50-80℃ for 30-60 minutes. Select a template that matches the sample size and install the template on the base plate of the sealing device. Place the dried sample into the template groove, ensuring that the test surface of the sample faces upwards; The upper cover moves vertically downwards via the motor screw guide rail, and the sealing blade presses into the edges around the sample, tightly gripping and wrapping the sample edges and its protective layer, thus completing the sealing. After the edge sealing is completed, the edge sealing device and the sample are moved into the bracket in the salt spray test chamber at the same time to start the salt spray test; After the test, open the salt spray chamber and wait for the sealing device to cool to room temperature before taking out the sample to complete the test.

[0011] Furthermore, if the sample is rusty, before soaking the sample in ethanol, select a 5%-10% dilute hydrochloric acid solution and add 0.5%-1% hexamethylenetetramine to prepare a rust remover; immerse the sample in the rust remover for 5-15 minutes; after immersion, rinse the sample with deionized water for 3-8 minutes.

[0012] Furthermore, the concentration of the NaCl solution in the neutral salt spray chamber is 5%, the pH is 6.5-7.2, the temperature is 33-37℃, and the salt spray deposition rate is 1-2 mL / ( ).

[0013] Advantages and positive effects of the present invention: By using a bracket to assemble a motor screw guide rail, and with the upper cover rigidly connected to the guide rail slider, the edge sealing action is automated. No manual pressing or pasting is required; simply controlling the motor is enough to drive the upper cover and sealing blade to fall precisely. A single edge sealing action can be completed quickly, significantly reducing the edge sealing time for a single sample.

[0014] Compared to the tedious process of traditional tape sealing, which involves "pasting and aligning each side individually," this solution achieves four-sided sealing in a single operation by matching the sealing blade's four-sided enclosed rectangle with the template groove, thus avoiding repetitive manual steps.

[0015] Meanwhile, when the motor drives the upper cover to fall to the working position, the cooperation between the cutting edge and the groove body can ensure that the edge of the sample is fully wrapped and sealed, preventing salt spray and moisture from seeping in from the edge gaps, thereby eliminating the hidden danger of the edge affecting the corrosion test results. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a sealing device for salt spray test specimens provided by the present invention.

[0018] Figure 2 This is a schematic diagram of the upper cover structure of a sealing device for salt spray test specimens provided by the present invention.

[0019] Figure 3This is a schematic diagram of the internal structure of a sealing device for salt spray test specimens provided by the present invention.

[0020] Figure 4 This is a side view of a sealing device for salt spray test specimens provided by the present invention.

[0021] In the diagram: 1. Base; 2. Pressure rod; 3. Template; 4. Ear plate; 5. Housing; 6. Bracket; 7. Top cover; 8. Base plate; 9. Horizontal guide groove; 10. Guide rail; 11. First spring; 12. Sealing edge; 13. Groove; 14. Extension; 15. First connecting rod; 16. Second connecting rod; 17. Limiting block; 18. Second spring; 19. Vertical guide groove; 20. Limiting groove; 21. Inclined surface; 22. Top cover pivot; 23. Support limiting plate; 24. Angle adjustment hole; 25. Guide strip hole; 26. Guide plate. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0023] This invention provides a sealing device for salt spray test specimens, such as... Figure 1 As shown, the system includes a base 1, a top cover 7, and a bracket 6. The bracket 6 is mounted on the base 1, and an ear plate 4 is installed at the connection between the bracket 6 and the base 1, and is fixed by bolts. A motor lead screw guide rail 10 is mounted on the bracket 6 along the vertical direction; the base plate 8 is provided with positioning holes, and the template 3 is provided with positioning pins corresponding to the positioning holes.

[0024] like Figure 4 As shown, the bracket 6 and the base 1 are rotatably connected by a rotating shaft. The sidewalls of the bracket 6 and the base 1 near the connection point are bolted together with the same ear plate 4. The ear plate 4 is provided with an angle adjustment hole 24. Two guide plates 26 are installed on the slider of the motor screw guide rail 10. The two guide plates 26 are provided with guide strip holes 25 on the same side facing each other. The same support limiting plate 23 is horizontally installed at the bottom of the two guide plates 26. The support limiting plate 23 is located below the upper cover 7. Under the support of the support limiting plate 23, the upper cover 7 remains horizontal. On the two side walls of the upper cover 7, corresponding to the guide strip holes 25, the upper cover rotating shafts 22 are respectively provided. The upper cover rotating shafts 22 are embedded in the guide strip holes 25 and can slide along the length of the hole.

[0025] like Figure 1As shown, a sealing blade 12 is installed at the bottom of the top cover 7. The sealing blade 12 forms a rectangular structure by surrounding the four sides in the horizontal direction. On the base 1, and located directly below the rectangle surrounded by the sealing blade 12, a base plate 8 is installed. A positioning groove is provided on the base plate 8. The edge of the template 3 extends outward to form an extension 14. The extension 14 overlaps the edge of the positioning groove on the base plate 8 and is detachably connected to the base plate 8 by bolts.

[0026] The top of the template 3 has a groove 13. The top opening of the groove 13 is shaped to match the rectangular shape of the sealing blade 12. When the sealing blade 12 falls to the working position with the top cover 7, the outer wall of the sealing blade 12 can fit against the inner wall of the groove 13 of the template 3.

[0027] The rectangular structure formed by the sealing blade edges 12 has a horizontal cross-sectional area that gradually decreases from top to bottom. Each sealing blade edge 12 constituting this rectangular frame is inclined towards the center of the rectangle relative to the vertical direction at an angle of 30°. This ensures that the blade edge gradually and tightly adheres to the groove during the descent, preventing seal failure due to instantaneous impact. At the same time, the inclination angle can distribute pressure and ensure uniform sealing on all four sides.

[0028] like Figures 2-3 As shown, horizontal guide grooves 9 are symmetrically provided on both sides of the upper cover 7, and limit blocks 17 are slidably assembled in the horizontal guide grooves 9; a first spring 11 is connected between the limit block 17 and the inner wall of the corresponding side of the upper cover 7; a housing 5 is symmetrically installed on the base 1 at the positions on both sides of the template 3, and a pressure rod 2 is hinged to the housing 5 through a pivot, and a second spring 18 is vertically connected between the pressure rod 2 and the lower wall of the housing 5; one end of the pressure rod 2 extends to the outside of the housing 5 to form an operating end, and the other end is hinged to one end of the first connecting rod 15 through a pivot; the other end of the first connecting rod 15 is hinged to the lower end of the second connecting rod 16 through a pivot; a vertical guide groove 19 is provided on the top of the housing 5, and the second connecting rod 16 is adapted to pass through the vertical guide groove 19 and can slide up and down along the vertical guide groove 19; a limit groove 20 is provided on the side wall of the second connecting rod 16 facing the limit block 17. The upper end surface of the second connecting rod 16 and the lower end surface of the limit block 17 are respectively provided with matching inclined surfaces 21.

[0029] Working principle: Select a matching template 3 according to the sample size. The size of the groove 13 corresponds to the sample. The extension 14 of the template edge overlaps with the positioning groove edge of the substrate 8 and the extension 14 is fixed to the substrate 8 with bolts. The detachable design makes it easy to replace templates of different specifications.

[0030] The sample to be sealed is placed in the groove 13 of the template 3. The shape and size of the groove 13 provide initial positioning for the sample and prevent horizontal displacement of the sample during the sealing process.

[0031] The motor lead screw guide rail 10 is started, and its slider drives the upper cover 7 to move vertically downward. During the process, with the guiding accuracy of the motor lead screw, the upper cover 7 is ensured to fall smoothly in the vertical direction. The support limit plate 23 supports the upper cover 7 to keep it horizontal, ensuring that the sealing blade 12 is precisely aligned with the groove 13 of the template 3.

[0032] When the sealing blade 12 falls to the working position with the upper cover 7, the outer wall of the sealing blade 12 is tightly fitted with the inner wall of the groove 13 of the template 3. During the fall of the upper cover 7, the limiting blocks 17 on both sides of it descend synchronously with the upper cover 7, pressing the operating end of the pressure rod 2. The pressure rod 2 rotates around the pivot and compresses the second spring 18. Through the first connecting rod 15, it drives the second connecting rod 16 to move upward along the vertical guide groove 19. When the limiting block 17 contacts the upper end face of the second connecting rod 16, the inclined surfaces of the two interact with each other, pushing the limiting block 17 to slide inward along the horizontal guide groove 9 and compressing the first spring 11. When the limiting block 17 completely passes the second connecting rod 16, the first spring 11 resets, causing the limiting block 17 to slide outward. Its outer end face is inserted into the limiting groove 20 on the side wall of the second connecting rod 16. The pressure rod 2 is released, and the second spring 18 applies a downward force to the second connecting rod 16 through the pressure rod 2, the first connecting rod 15, and finally locks the upper cover 7 in the working position, preventing the upper cover from lifting due to vibration during the sealing process. This allows the mechanical pressure of the sealing blade 12 to seal the edge of the sample. Sealing material can be placed in the groove 13 in advance, and the sealing is completed by the pressure of the blade.

[0033] After sealing, remove the ear plate 4, rotate the bracket 6 to the position of the angle adjustment hole 24, and then fix it with bolts. During the angle adjustment process, the upper cover shaft 22 of the upper cover 7 rotates and moves within the guide strip hole 25 to ensure that the outer wall of the sealing blade 12 is always in close contact with the inner wall of the template 3 groove 13. Since the internal space of the salt spray test chamber is an irregular rectangular structure with an inclined bottom, by adjusting the angle between the bracket 6 and the base 1, the overall structural shape of the device can match the internal spatial shape of the salt spray test chamber, ensuring that the sample is placed at an inclination in the salt spray test chamber to meet the test requirements.

[0034] The edge sealing device is placed in the salt spray test chamber for testing. After the test, the edge sealing device is taken out and the limiting block 17 is pushed away from the guide groove 19 to separate the limiting block 17 from the guide groove 19 and release the lock. At this time, the motor screw guide rail 10 drives the upper cover 7 to reset upward, completing one edge sealing cycle.

[0035] A salt spray test method based on a sealing device for salt spray test specimens includes the following steps: wiping the device with a lint-free cloth soaked in anhydrous ethanol.

[0036] Observe whether the sample is rusty. If the sample is rusty, prepare a rust remover by adding 0.5%-1% hexamethylenetetramine to a 5%-10% dilute hydrochloric acid solution. Immerse the sample in the rust remover for 5-15 minutes. After immersion, rinse the sample with deionized water for 3-8 minutes to remove the rust. Alternatively, immerse the rust-free sample or the sample that has undergone rust removal treatment in 95%-99% ethanol for 10-20 minutes.

[0037] Rinse the soaked sample with deionized water for 2-5 minutes.

[0038] After cleaning, the sample is placed in an oven for drying at a temperature of 50-80℃ for 30-60 minutes.

[0039] Inspect the sample surface under adequate lighting conditions; it should be free of any defects, contaminants, and water stains. After pretreatment, hold the sample by the edge, avoiding touching the cleaned test surface. Select a template that fits the sample size and install the template on the base plate of the sealing device.

[0040] Place the dried sample into the template groove, ensuring that the test surface of the sample faces upwards.

[0041] The upper cover moves vertically downwards via the motor screw guide rail, and the sealing edge presses into the edges around the sample, tightly gripping and wrapping the sample edges and its protective layer, thus completing the sealing.

[0042] After sealing, the sealing device and the sample are simultaneously moved onto the support in the salt spray test chamber to begin the salt spray test. The neutral salt spray solution in the salt spray chamber has a concentration of 5%, a pH of 6.5-7.2, a temperature of 33-37℃, and a salt spray deposition rate of 1-2 mL / ( ).

[0043] After the test, open the salt spray chamber and wait for the sealing device to cool to room temperature before taking out the sample to complete the test.

[0044] Case 1: Edge sealing of a 100×150mm cold-rolled steel sheet sample.

[0045] Degreased with 95% ethanol for 15 minutes, rinsed with deionized water for 3 minutes, and dried at 60℃ for 45 minutes.

[0046] Select a polytetrafluoroethylene template (size 100×150×6mm) with positioning hole size 95×145mm (tolerance ±0.1mm); place it into the positioning groove of the base, ensuring that the edge of the template fits snugly against the positioning groove.

[0047] The cold-rolled steel plate sample is placed in the template groove, with the edge of the sample naturally extending 0.5mm beyond the groove.

[0048] The top cover moves downwards to seal the edges.

[0049] After the edge sealing is completed, place the device in the salt spray chamber and start the test.

[0050] After the test is completed, remove the device and the sample, replace the template, and the next batch of samples can be processed.

[0051] Test results: After sealing for 2 minutes and salt spray test (5% NaCl solution, 35℃) for 72 hours, there were no corrosion marks in the non-tested areas, and the sealing qualification rate was 100%.

[0052] Example 2: 30 cycles of CCT test on 50×100mm home appliance board.

[0053] Replace with a 50×100mm template (window size 49.5×99.5mm) and repeat the above steps.

[0054] Test results: After cyclic corrosion, there was no blistering or peeling at the edge of the coating, and the adhesion remained at grade 0 (GB / T9286).

[0055] Implementation Case 3: Edge sealing of 150×200mm automotive steel sample.

[0056] Select a template (groove body 149.5×199.5mm) that is suitable for a 150×200mm sample, place it into the positioning groove of the base, and ensure that the edge of the template fits the positioning groove.

[0057] A pretreated 150×200mm automotive steel sample is placed in the template window, with the sample edge naturally extending 0.5mm beyond the window.

[0058] The sealing operation was performed using the device. After the sealing was completed, the item was placed in a salt spray chamber, and the test was started.

[0059] Test results: After approximately 2 minutes of sealing, and 96 hours of salt spray testing (5% NaCl solution, 35℃), the test surface of the sample showed uniform corrosion, while no corrosion penetration was observed in the non-test areas. Subsequent batches of samples could be processed quickly by changing to different sized templates.

[0060] Implementation Case 4: Sealing the edge of an 80×120mm irregularly shaped sample Replace with a custom-made 80×120mm irregular-shaped template (groove body 79.5×119.5mm), place it into the base positioning groove, and ensure that the edge of the template fits snugly against the positioning groove.

[0061] The pre-treated 80×120mm irregular-shaped sample is placed into the template groove, with the edge of the sample naturally extending 0.5mm beyond the window.

[0062] After sealing the edges of the device, place it in the salt spray chamber and start the test.

[0063] Test results: The sealing time was approximately 2 minutes. After a damp heat test (50℃, 95%RH) for 120 hours, the corrosion on the test surface of the irregularly shaped sample was uniform, and there were no traces of corrosion penetration in the non-test areas. The sealing pass rate reached 100%, proving the precise adaptability of the customized template to irregularly shaped samples. Subsequent batches of irregularly shaped samples can be processed quickly after changing the template.

[0064] The guiding significance of this experiment is as follows: The case study of sealing irregularly shaped samples demonstrates that precise sealing of non-standard sized / shaped samples can be achieved by changing the adaptable template, breaking through the limitations of traditional sealing devices on sample shape.

[0065] With a sealing time of only 2 minutes and a sealing pass rate of 100%, the efficiency and sealing of the motor screw drive cutting edge and groove meshing structure in the case of irregular sample scenarios are verified, providing technical support for high-throughput and diversified sample testing.

[0066] The rapid template replacement mechanism enables seamless switching between samples of different specifications, reduces differences in manual operation, ensures consistency of test conditions, and improves the comparability and reliability of corrosion resistance test results for metallic materials.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sealing device for salt spray test specimens, characterized in that, The device includes a base (1), a top cover (7), and a bracket (6). The bracket (6) is mounted on the base (1), and a motor screw guide rail (10) is mounted on the bracket (6) in the vertical direction. The top cover (7) is rigidly connected to the slider of the motor screw guide rail (10). A sealing blade (12) is installed at the bottom of the top cover (7), and the sealing blade (12) is enclosed on all four sides in the horizontal direction to form a rectangular structure. A template (3) is installed on the base (1) and located directly below the rectangular structure enclosed by the sealing blade (12). A groove (13) is opened on the top of the template (3). The top opening of the groove (13) is matched with the rectangular structure enclosed by the sealing blade (12). When the sealing blade (12) falls to the working position with the top cover (7), the outer wall of the sealing blade (12) can fit against the inner wall of the groove (13) of the template (3).

2. The sealing device for salt spray test specimens according to claim 1, characterized in that, The rectangular structure formed by the sealing blade (12) has a horizontal cross-sectional area that gradually decreases from top to bottom; each sealing blade (12) constituting the rectangular frame is inclined towards the center of the rectangle relative to the vertical direction, with an inclination angle of 30°.

3. The sealing device for salt spray test specimens according to claim 1, characterized in that, The base (1) is fixedly mounted on the substrate (8), and the substrate (8) has a positioning groove. The edge of the template (3) extends outward to form an extension (14), which overlaps the edge of the positioning groove of the substrate (8) and is connected to the substrate (8) by bolts.

4. The sealing device for salt spray test specimens according to claim 1, characterized in that, The upper cover (7) has horizontal guide grooves (9) symmetrically provided on both sides, and limit blocks (17) are slidably assembled in the horizontal guide grooves (9); a first spring (11) is connected between the limit block (17) and the inner wall of the corresponding side of the upper cover (7); a housing (5) is symmetrically installed on the base (1) on both sides of the template (3), and a pressure rod (2) is hinged to the housing (5) through a rotating shaft, and a second spring (18) is vertically connected between the pressure rod (2) and the lower wall of the housing (5); the pressure rod ( 2) One end extends to the outside of the housing (5) to form an operating end, and the other end is hinged to one end of the first connecting rod (15) through a rotating shaft; the other end of the first connecting rod (15) is hinged to the lower end of the second connecting rod (16) through a rotating shaft; the top of the housing (5) is provided with a vertical guide groove (19), and the second connecting rod (16) is adapted to pass through the vertical guide groove (19) and can slide up and down along the vertical guide groove (19); the side wall of the second connecting rod (16) facing the limiting block (17) is provided with a limiting groove (20).

5. A sealing device for salt spray test specimens according to claim 4, characterized in that, The upper end face of the second connecting rod (16) and the lower end face of the limiting block (17) are respectively provided with matching inclined surfaces (21).

6. A sealing device for salt spray test specimens according to claim 1, characterized in that, The bracket (6) and the base (1) are rotatably connected by a rotating shaft. The bracket (6) and the base (1) are connected by bolts to the same ear plate (4) on the side wall near the connection point. The ear plate (4) is provided with an angle adjustment hole (24). Two guide plates (26) are installed on the slider of the motor screw guide rail (10). The two guide plates (26) are provided with guide strip holes (25) on the same side facing each other. The same support limiting plate (23) is installed horizontally at the bottom of the two guide plates (26). The support limiting plate (23) is located below the upper cover (7). On the two side walls of the upper cover (7), corresponding to the guide strip holes (25), the upper cover rotating shaft (22) is provided. The upper cover rotating shaft (22) is embedded in the guide strip hole (25) and can slide along the length of the hole.

7. A sealing device for salt spray test specimens according to claim 1, characterized in that, The substrate (8) is provided with positioning holes, and the template (3) is provided with positioning pins corresponding to the positioning holes.

8. A salt spray test method based on the sealing device for salt spray test specimens according to any one of claims 1-7, characterized in that, Includes the following steps: Wipe the device with a lint-free cloth soaked in anhydrous ethanol; immerse the sample in ethanol with a concentration of 95%-99% for 10-20 minutes. Rinse the soaked sample with deionized water for 2-5 minutes; After cleaning, place the sample in an oven to dry at a temperature of 50-80℃ for 30-60 minutes. Select a template that matches the sample size and install the template on the base plate of the sealing device. Place the dried sample into the template groove, ensuring that the test surface of the sample faces upwards; The upper cover moves vertically downwards via the motor screw guide rail, and the sealing blade presses into the edges around the sample, tightly gripping and wrapping the sample edges and its protective layer, thus completing the sealing. After the edge sealing is completed, the angle between the base and the bracket is adjusted by the ear plate to match the edge sealing device with the internal structure of the salt spray test chamber; Move the sealing device and the sample into the bracket in the salt spray test chamber at the same time to start the salt spray test. After the test, open the salt spray chamber and wait for the sealing device to cool to room temperature before taking out the sample to complete the test.

9. A salt spray test method according to claim 8, characterized in that, If the sample is rusty, before soaking the sample in ethanol, prepare a rust remover by adding 0.5%-1% hexamethylenetetramine to a 5%-10% dilute hydrochloric acid solution. Soak the sample in the rust remover for 5-15 minutes. After soaking, rinse the sample with deionized water for 3-8 minutes.

10. A salt spray test method according to claim 8, characterized in that, The neutral salt spray in the salt spray chamber has a NaCl solution concentration of 5%, a pH of 6.5-7.2, a temperature of 33-37℃, and a salt spray deposition rate of 1-2 ml / ( ).

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