A salt spray test chamber for testing the corrosion resistance of a coating

Abstract

This utility model relates to the technical field of salt spray test chambers, specifically a salt spray test chamber for testing the corrosion resistance of coatings. It includes a test chamber mounted on a frame, with an inlet pipe on the back for supplying salt spray into the chamber. The end of the inlet pipe is connected to multiple atomizing nozzles mounted on the inner wall of the test chamber. An air inlet pipe is mounted on the top of the test chamber for supplying air into the chamber. A rotating rod rotatably penetrates the test chamber shell and is mounted on the rotating rod. A movable frame is mounted on the rotating rod. The end of the air inlet pipe is connected to multiple nozzles mounted at the bottom of the movable frame. An air pump is mounted on the frame, with one end of the air inlet pipe installed at the air pump's outlet. This utility model can change the angle at which the salt spray is blown onto the surface of the workpiece coating, simulating an environment with changing wind speed angles to achieve multi-angle salt spray impact. This facilitates the simulation of the non-directional deposition of salt spray from natural wind, improves the consistency of corrosion between the coating edge and center, and enhances the accuracy of test data.

Description

Technical Field

[0001] This utility model relates to the technical field of salt spray test chambers, specifically a salt spray test chamber for testing the corrosion resistance of coatings. Background Technology

[0002] Salt spray test chambers use compressed air to atomize and spray a salt solution (such as 5% NaCl), creating a high-concentration salt spray environment within a sealed chamber. Combined with a constant temperature and humidity control system, this accelerates the corrosion of metal coatings in marine or industrial atmospheric environments. Compared to natural exposure, the test cycle can be shortened from years to hours to hundreds of hours, significantly improving testing efficiency.

[0003] Traditional equipment relies on a single nozzle, resulting in large deviations in the uniformity of salt spray deposition and high dispersion in results for samples from the same batch. This is especially true for large workpieces, where the corrosion rate differs significantly between the coating edge and the center. Furthermore, most current equipment uses fixed spray towers and unidirectional spraying, resulting in a single salt spray diffusion pattern. However, salt spray in the real marine atmosphere is affected by changes in wind speed and direction, exhibiting dynamic deposition characteristics. Existing technologies struggle to simulate such multi-angle salt spray impacts, leading to large deviations in corrosion rates between the coating edge and the center. To address these issues, we provide a salt spray test chamber for coating corrosion resistance testing. Summary of the Invention

[0004] The purpose of this invention is to provide a salt spray test chamber for testing the corrosion resistance of coatings, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A salt spray test chamber for testing the corrosion resistance of a coating includes a test chamber mounted on a frame. A liquid inlet pipe for supplying salt spray into the test chamber is located on the back of the test chamber. The end of the liquid inlet pipe is connected to multiple atomizing nozzles mounted on the inner wall of the test chamber. An air inlet pipe for supplying air into the test chamber is located on the top of the test chamber. A rotating rod rotatably penetrates the test chamber shell and is mounted on the frame. A movable frame is mounted on the rotating rod. The end of the air inlet pipe is connected to multiple nozzles located at the bottom of the movable frame. An air pump is mounted on the frame, and one end of the air inlet pipe is installed at the air outlet of the air pump.

[0007] The air pump includes a main shaft whose output end is connected to an impeller. The main shaft and the rotating rod are connected by a linkage structure. When the main shaft rotates, it drives the rotating rod to rotate clockwise and counterclockwise.

[0008] A salt spray test chamber for coating corrosion resistance testing as described above: the linkage structure includes a secondary shaft rotatably mounted on the frame. The secondary shaft and the main shaft are driven by a gear mechanism. When the main shaft rotates, it drives the secondary shaft to rotate synchronously. The secondary shaft and the rotating rod are driven by a swing mechanism. When the secondary shaft rotates, it drives the rotating rod to rotate clockwise and counterclockwise reciprocatingly.

[0009] A salt spray test chamber for coating corrosion resistance testing as described above: the gear mechanism includes a first gear disposed on the main shaft and a second gear disposed on the secondary shaft, wherein the first gear meshes with the second gear.

[0010] A salt spray test chamber for coating corrosion resistance testing as described above: the swing mechanism includes a turntable disposed at one end of a secondary shaft and a swing arm disposed on a rotating rod. The swing arm has a movable groove, and the turntable has a protruding rod that is movably engaged inside the movable groove.

[0011] A salt spray test chamber for coating corrosion resistance testing as described above: multiple nozzles are evenly distributed at the bottom of the movable frame, and the nozzles are located above the atomizing nozzle.

[0012] A salt spray test chamber for coating corrosion resistance testing as described above: the front of the test chamber is fitted with an inspection door by a hinge, and the inspection door is made of transparent glass or transparent plastic.

[0013] A salt spray test chamber for testing the corrosion resistance of a coating, as described above: the bottom of the test chamber is provided with a waste discharge pipe for discharging the salt spray waste liquid after the test, and a valve is installed on the waste discharge pipe.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: In use, the salt solution is delivered to the inlet pipe by compressed air and sprayed into the test chamber through atomizing nozzles. An air inlet pipe is provided on the top of the test chamber for supplying air into the test chamber. The end of the air inlet pipe is connected to multiple nozzles set at the bottom of the movable frame. The air inlet pipe is installed at the air outlet of the air pump. When the air pump is started, air is supplied to the air inlet pipe and blown evenly into the test chamber through multiple nozzles. This can accelerate the flow of the salt mist sprayed by the atomizing nozzles, making the salt mist blown more evenly onto the coating surface of the workpiece inside the test chamber. This is conducive to improving the coverage of the salt mist spray and enabling the salt mist to impact the center area and edges of the coating.

[0015] Additionally, the air pump includes a main shaft connected to the impeller at its output end. The main shaft and the rotating rod are connected by a linkage structure. When the main shaft rotates, it drives the rotating rod to rotate clockwise and counterclockwise. That is, when the air pump is started to send air into the air inlet pipe, it will simultaneously drive the rotating rod to rotate clockwise and counterclockwise, which in turn drives the movable frame to rotate clockwise and counterclockwise, thereby driving multiple nozzles to rotate clockwise and counterclockwise simultaneously. The reciprocating rotation of the nozzles can change the angle at which the salt spray is blown onto the surface of the workpiece coating, simulating an environment with changing wind speed angles to achieve multi-angle salt spray impact. This is beneficial for simulating the non-directional deposition of natural wind salt spray, improving the consistency of corrosion between the coating edge and center, and improving the accuracy of test data. Attached Figure Description

[0016] Figure 1 This is a first-view schematic diagram of the overall structure of a salt spray test chamber for testing the corrosion resistance of a coating.

[0017] Figure 2 This is a schematic diagram of the overall structure of a salt spray test chamber for testing the corrosion resistance of a coating, viewed from a second perspective.

[0018] Figure 3 A salt spray test chamber for testing the corrosion resistance of coatings. Figure 2 A schematic diagram of the decomposed local structure.

[0019] Figure 4 A salt spray test chamber for testing the corrosion resistance of coatings. Figure 3 A schematic diagram of the decomposed local structure.

[0020] Figure 5 A salt spray test chamber for testing the corrosion resistance of coatings. Figure 4 A structural diagram from another perspective.

[0021] Figure 6 A salt spray test chamber for testing the corrosion resistance of coatings. Figure 4 A schematic diagram of the decomposed local structure.

[0022] In the diagram: 1. Frame; 2. Test chamber; 3. Liquid inlet pipe; 4. Atomizing nozzle; 5. Air inlet pipe; 6. Movable frame; 7. Nozzle; 8. Rotating rod; 9. Air pump; 10. First gear; 11. Countershaft; 12. Second gear; 13. Turntable; 14. Protruding rod; 15. Swing arm; 16. Movable groove; 17. Inspection door; 18. Main shaft. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Please see Figures 1-6As an embodiment of this utility model, a salt spray test chamber for coating corrosion resistance testing includes a test chamber 2 mounted on a frame 1. A liquid inlet pipe 3 for conveying salt spray into the test chamber 2 is provided on the back of the test chamber 2. The end of the liquid inlet pipe 3 is connected to a plurality of atomizing nozzles 4 mounted on the inner wall of the test chamber 2. An air inlet pipe 5 for supplying air into the test chamber 2 is provided on the top of the test chamber 2. A rotating rod 8 is rotatably mounted on the frame 1 and passes through the shell of the test chamber 2. A movable frame 6 is mounted on the rotating rod 8. The end of the air inlet pipe 5 is connected to a plurality of nozzles 7 mounted at the bottom of the movable frame 6. An air pump 9 is mounted on the frame 1. One end of the air inlet pipe 5 is installed at the air outlet of the air pump 9.

[0025] The air pump 9 includes a main shaft 18 connected to the impeller at the output end. The main shaft 18 and the rotating rod 8 are connected by a linkage structure. When the main shaft 18 rotates, it will drive the rotating rod 8 to rotate clockwise and counterclockwise back and forth.

[0026] In this embodiment, during use, the workpiece to be tested is placed inside the test chamber 2. Compressed air is used to deliver a salt solution to the inlet pipe 3, which is then atomized and sprayed into the test chamber 2 through the atomizing nozzle 4. An air inlet pipe 5 is installed at the top of the test chamber 2 to supply air into the chamber. The end of the air inlet pipe 5 is connected to multiple nozzles 7 located at the bottom of the movable frame 6. The air inlet pipe 5 is installed at the air outlet of the air pump 9. The air pump 9 is electrically connected to an external power source via a wire. Starting the air pump 9 supplies air to the air inlet pipe 5, which then passes the air through the multiple nozzles 7. The air is blown evenly into the test chamber 2, thereby accelerating the flow of the salt mist sprayed by the atomizing nozzle 4 and making the salt mist blow more evenly onto the coating surface of the workpiece inside the test chamber 2. In addition, when the air pump 9 is started to send air into the air inlet pipe 5, it will simultaneously drive the rotating rod 8 to rotate clockwise and counterclockwise, which in turn drives the movable frame 6 to rotate clockwise and counterclockwise, thereby driving multiple nozzles 7 to rotate clockwise and counterclockwise simultaneously. The reciprocating rotation of the nozzles 7 can change the angle at which the salt mist is blown onto the coating surface of the workpiece, simulating the environment of changing wind speed and angle to achieve multi-angle salt mist impact.

[0027] As a further embodiment of this utility model, the linkage structure includes a secondary shaft 11 rotatably mounted on the frame 1. The secondary shaft 11 and the main shaft 18 are driven by a gear mechanism. When the main shaft 18 rotates, it will drive the secondary shaft 11 to rotate synchronously. The secondary shaft 11 and the rotating rod 8 are driven by a swing mechanism. When the secondary shaft 11 rotates, it will drive the rotating rod 8 to rotate clockwise and counterclockwise.

[0028] In this embodiment, when the air pump 9 is started, the main shaft 18 rotates. The main shaft 18 is driven by the auxiliary shaft 11 through a gear mechanism. The rotation of the main shaft 18 will drive the auxiliary shaft 11 to rotate synchronously. The auxiliary shaft 11 is driven by the rotating rod 8 through a swing mechanism. The rotation of the auxiliary shaft 11 will drive the rotating rod 8 to rotate clockwise and counterclockwise, thereby driving the nozzle 7 on the movable frame 6 to swing clockwise and counterclockwise.

[0029] As a further embodiment of this utility model, the gear mechanism includes a first gear 10 disposed on the main shaft 18 and a second gear 12 disposed on the secondary shaft 11, wherein the first gear 10 meshes with the second gear 12.

[0030] In this embodiment, when the main shaft 18 rotates, it drives the first gear 10 to rotate. The first gear 10 meshes with the second gear 12 to drive the second gear 12 to rotate. When the second gear 12 rotates, it drives the secondary shaft 11 to rotate synchronously.

[0031] As a further embodiment of this utility model, the swing mechanism includes a turntable 13 disposed at one end of the secondary shaft 11 and a swing arm 15 disposed on the rotating rod 8. The swing arm 15 is provided with a movable groove 16, and the turntable 13 is provided with a protruding rod 14, which is movably engaged inside the movable groove 16.

[0032] In this embodiment, when the secondary shaft 11 rotates, it will drive the turntable 13 to rotate, which in turn drives the protruding rod 14 to rotate. The protruding rod 14 is movably engaged in the movable groove 16, which will drive the swing arm 15 to swing back and forth, thereby driving the rotating rod 8 on the swing arm 15 to rotate clockwise and counterclockwise.

[0033] As a further embodiment of this utility model, multiple nozzles 7 are evenly distributed at the bottom of the movable frame 6, with the nozzles 7 located above the atomizing nozzle 4.

[0034] In this embodiment, multiple nozzles 7 blow air evenly into the test chamber 2, thereby accelerating the flow of salt mist sprayed by the atomizing nozzle 4 and making the salt mist blow more evenly onto the coating surface of the workpiece inside the test chamber 2.

[0035] As a further embodiment of this utility model, the front of the test chamber 2 is hinged with an inspection door 17, which is made of transparent glass or transparent plastic.

[0036] In this embodiment, the inspection door 17 is made of transparent glass or transparent plastic, which facilitates direct observation of the corrosion of the workpiece coating surface inside the test chamber 2.

[0037] As a further embodiment of this utility model, the bottom of the test chamber 2 is provided with a waste discharge pipe for discharging the salt spray waste liquid after the test, and a valve is installed on the waste discharge pipe.

[0038] In this embodiment, after the salt spray test is completed, the valve on the waste discharge pipe is opened, and the salt spray waste liquid after the test is discharged to the outside through the waste discharge pipe.

[0039] In use, the workpiece to be tested is placed inside the test chamber 2. Compressed air is used to deliver the salt solution to the inlet pipe 3, which is then atomized and sprayed into the test chamber 2 through the atomizing nozzle 4. An air inlet pipe 5, located at the top of the test chamber 2, supplies air into the chamber. Multiple nozzles 7, located at the bottom of the movable frame 6, are connected to the end of the air inlet pipe 5. The air inlet pipe 5 is installed at the outlet of an air pump 9, which is electrically connected to an external power source via wires. Activating the air pump 9 supplies air to the air inlet pipe 5 and, through the multiple nozzles 7, blows air evenly into the test chamber 2, thereby accelerating the flow of the salt mist sprayed by the atomizing nozzle 4. The air is blown more evenly onto the coating surface of the workpiece inside the test chamber 2. In addition, when the air pump 9 is started, the main shaft 18 rotates. The main shaft 18 is driven by the auxiliary shaft 11 through a gear mechanism. The rotation of the main shaft 18 will drive the auxiliary shaft 11 to rotate synchronously. The auxiliary shaft 11 is driven by the swing mechanism through the swing mechanism. The rotation of the auxiliary shaft 11 will drive the swing rod 8 to rotate clockwise and counterclockwise. This will drive the nozzle 7 on the movable frame 6 to swing clockwise and counterclockwise. The reciprocating swing of the nozzle 7 can change the angle at which the salt spray is blown onto the coating surface of the workpiece, simulating the environment of changing wind speed and angle to achieve multi-angle salt spray impact.

[0040] The above embodiments are exemplary and not restrictive. Therefore, without departing from the spirit or basic characteristics of this utility model, any technical solutions that can be implemented in other specific forms are included in this utility model.

Claims

1. A salt spray test chamber for plating corrosion resistance testing, comprising a test chamber (2) arranged on a frame (1), characterized in that, The back of the test chamber (2) is provided with an inlet pipe (3) for conveying salt spray into the test chamber (2). The end of the inlet pipe (3) is connected to a plurality of atomizing nozzles (4) set on the inner wall of the test chamber (2). The top of the test chamber (2) is provided with an air inlet pipe (5) for supplying air into the test chamber (2). A rotating rod (8) is rotatably provided on the frame (1) and penetrates the shell of the test chamber (2). A movable frame (6) is provided on the rotating rod (8). The end of the air inlet pipe (5) is connected to a plurality of nozzles (7) set at the bottom of the movable frame (6). An air pump (9) is provided on the frame (1). One end of the air inlet pipe (5) is installed at the air outlet of the air pump (9). The air pump (9) includes a main shaft (18) connected to the impeller at the output end. The main shaft (18) and the rotating rod (8) are connected by a linkage structure. When the main shaft (18) rotates, it will drive the rotating rod (8) to rotate clockwise and counterclockwise.

2. A salt spray test chamber for corrosion testing of plating layers according to claim 1, characterized in that The linkage structure includes a secondary shaft (11) rotatably mounted on the frame (1). The secondary shaft (11) and the main shaft (18) are driven by a gear mechanism. When the main shaft (18) rotates, it will drive the secondary shaft (11) to rotate synchronously. The secondary shaft (11) and the rotating rod (8) are driven by a swing mechanism. When the secondary shaft (11) rotates, it will drive the rotating rod (8) to rotate clockwise and counterclockwise.

3. A salt spray test chamber for corrosion testing of plating layers according to claim 2, characterized in that The gear mechanism includes a first gear (10) disposed on the main shaft (18) and a second gear (12) disposed on the secondary shaft (11), wherein the first gear (10) meshes with the second gear (12).

4. A salt spray test chamber for corrosion testing of plating layers according to claim 2, wherein The swing mechanism includes a turntable (13) at one end of the secondary shaft (11) and a swing arm (15) on the rotating rod (8). The swing arm (15) has a movable groove (16), and the turntable (13) has a protruding rod (14) which is movably engaged inside the movable groove (16).

5. A salt spray test chamber for corrosion testing of plating layers according to claim 1, wherein Multiple nozzles (7) are evenly spaced at the bottom of the movable frame (6), and the nozzles (7) are located above the atomizing nozzle (4).

6. A salt spray test chamber for corrosion testing of plating layers according to claim 1, wherein The test chamber (2) has an inspection door (17) installed on the front by a hinge. The inspection door (17) is made of transparent glass or transparent plastic.

7. A salt spray test chamber for corrosion testing of plating layers according to claim 1, wherein The bottom of the test chamber (2) is provided with a discharge pipe for discharging the salt spray waste liquid after the test, and a valve is installed on the discharge pipe.

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