Salt spray simulation experiment equipment for paint detection

Abstract

The present application relates to paint detection technical field, specifically to a kind of salt fog simulation experiment equipment for paint detection.The salt fog simulation experiment equipment for paint detection includes: bucket and top cover, bucket and top cover combination forms corrosion space, corrosion space is used to hold corrosion liquid in;Heating assembly is arranged in bucket for heating.Fog generator is used to atomize corrosion liquid inside bucket, cavity ring is arranged on the bucket, the inner wall of bucket is provided with nozzle, nozzle is communicated with cavity ring, and fog generator is communicated with the bottom of bucket and cavity ring.Grip frame is provided with a plurality of clamping units for fixing paint sample on it.Rotary drive part is drivingly connected with grip frame, for driving grip frame to rotate.Through paint sample stirring inside bucket, under the action of centrifugal force and air flow, avoid the corrosion uneven caused by liquid drop accumulation on paint sample, improve the uniformity of corrosion experiment and the objectivity of detection.

Description

Technical Field

[0001] This invention relates to the field of coating testing technology, and specifically to a salt spray simulation test device for coating testing. Background Technology

[0002] Paint is a material that, when applied to the surface of an object, forms a tough protective or decorative film. It is widely used for protecting, beautifying, or giving objects special functions. The following is a detailed introduction to paint: 1. Composition of Paint. Paint typically consists of the following components: Film-forming substances (resin / base material): such as acrylic resin, epoxy resin, etc., which determine the paint's adhesion, hardness, and other properties. Pigments: provide color and hiding power (such as titanium dioxide); some pigments also have anti-rust (such as zinc phosphate) and weather-resistant functions. Solvents: adjust the paint's viscosity for easier application (such as water, organic solvents), and form a film after evaporation. Additives: improve performance, such as leveling agents (to make the surface smooth), defoamers (to prevent foaming), and UV absorbers (anti-aging). 2. Main Functions of Paint. Protection: prevents corrosion (such as anti-rust paint for metals), abrasion, and UV erosion. Decoration: provides color and gloss (such as wall latex paint, automotive metallic paint). Special Functions: fireproof (flame-retardant paint), mildew-proof (bathroom paint), heat insulation (building reflective paint), conductive (electronic component paint), etc. 3. Classification of Coatings. By Application: Architectural Coatings: Interior wall paint, exterior wall paint, floor paint. Industrial Coatings: Automotive paint, marine anti-corrosion coatings, machinery and equipment coatings. Specialty Coatings: Fire-retardant coatings, conductive coatings, stealth coatings. By Form: Solvent-based Coatings: Traditional oil paints containing organic solvents (e.g., nitrocellulose lacquer). Water-based Coatings: Water-based (e.g., latex paint), environmentally friendly and low in VOCs. Powder Coatings: Solvent-free, electrostatically sprayed and cured at high temperatures (used in home appliances and metal parts). By Function: Anti-corrosion coatings, heat-insulating coatings, antibacterial coatings, etc. 4. Application Areas. Construction Industry: Interior and exterior wall and roof waterproofing coatings. Industrial Manufacturing: Surface coatings for automobiles, aircraft, and electronic products. Home Decoration: Wood coatings, artistic coatings. Transportation: Ship and bridge anti-corrosion, road marking coatings. Special Scenarios: High-temperature resistant coatings for spacecraft, antibacterial coatings for hospitals. 5. Environmental Trends. With increasing environmental protection requirements, water-based coatings and powder coatings are gradually replacing traditional solvent-based coatings due to their low pollution and low VOC emissions. In addition, research and development directions also include innovative products such as self-healing coatings and photocatalytic air-purifying coatings.

[0003] Salt spray refers to a diffuse system composed of tiny salt droplets in the atmosphere. Salt spray testing is an environmental test that uses artificially simulated salt spray conditions created by salt spray testing equipment to assess the corrosion resistance of products or metal materials. Salt spray testing standards specify the conditions for salt spray testing, such as temperature, humidity, sodium chloride solution concentration, and pH value. In addition, technical requirements are put forward for the performance of salt spray test chambers. Products that need to undergo salt spray testing are mainly metal products, and the corrosion resistance of the products is examined through testing.

[0004] In traditional salt spray testing equipment, droplets tend to accumulate on the surface of the coating sample. Prolonged accumulation of droplets leads to differences between the components within the droplets and the components of the salt spray, resulting in uneven corrosion and distorted detection. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a salt spray simulation test device for coating testing, used to conduct salt spray simulation tests on paint surface samples. The salt spray simulation test device for coating testing includes:

[0006] The barrel and the top cover together form a corrosion space, which is used to hold corrosive liquids; the barrel is equipped with a heating component for heating at a specified temperature; the top cover can be manually installed and secured.

[0007] A mist generator is used to atomize the corrosive liquid inside the barrel. The barrel is provided with a cavity ring, and a nozzle is provided on the inner wall of the barrel. The nozzle is connected to the cavity ring, and the mist generator is connected to the bottom of the barrel and the cavity ring.

[0008] The clamping frame is equipped with multiple clamping units for fixing the paint sample; the clamping frame can be directly rotatably installed inside the barrel.

[0009] A rotation drive component, which is connected to the clamping frame via a transmission, is used to drive the clamping frame to rotate;

[0010] The controller is electrically connected to the fog generator, the rotation drive, and the heating assembly.

[0011] Preferably, the barrel is connected to an inlet pipe, which connects to a liquid pump and a liquid source; a component detection device is used to detect the content of various components in the corrosive liquid.

[0012] Preferably: A support frame is fixedly installed on the barrel body to restrict the rotation of the top cover. A lead screw is rotatably mounted on the support frame, with the lead screw positioned above the barrel body and its bottom end extending into the upper interior of the barrel body. A rotation drive component is connected to the lead screw. The top cover is a disc structure with a through hole in the center. Two first ball bearings are rotatably mounted on the side wall of the through hole, facing each other and engaging with a spiral groove. A connecting sleeve is rotatably mounted coaxially at the bottom of the top cover. The connecting sleeve also has a through hole in the center, with two second ball bearings rotatably mounted on the inner wall of the through hole, facing each other and engaging with the spiral groove. A lower ring groove is formed at the lower part of the lead screw, with the plane of the lower ring groove being consistent with the plane of the top cover. The lower ring groove is located above the bottom of the spiral groove, and the distance between the lower ring groove and the bottom of the spiral groove is the same as the distance between the first and second ball bearings. A top ring groove is formed at the top of the lead screw, connecting to the top of the spiral groove. A circular array of clamping frames is arranged on the connecting sleeve.

[0013] Preferably, the clamping unit includes a connecting rod, an upper clamping rod, and a lower clamping rod. The lower clamping rod is fixedly connected to the connecting rod, and the upper clamping rod is elastically slidable on the connecting rod via an elastic sliding assembly. The upper clamping rod is located above the lower clamping rod.

[0014] Preferred: A connecting plate is fixed on the connecting rod.

[0015] Preferably, the elastic sliding assembly includes a sliding groove, a sliding block, and a spring. The sliding groove is formed on the connecting rod, and the sliding block slides inside the sliding groove. The sliding direction of the sliding block is consistent with the clamping direction. A spring is provided inside the sliding groove, and the spring causes the sliding block to slide downward towards the clamping rod. The upper clamping rod is fixedly connected to the sliding block.

[0016] Preferably, a connecting side plate is fixedly provided on the upper clamping rod, and a connecting hole is provided on the side wall of the connecting side plate. Screws are fixed to the sliding block through the connecting hole, and the connecting side plate covers the outer surface of the sliding groove.

[0017] Preferably, the connecting hole includes a cylindrical portion and a polygonal portion, and the sliding block is provided with an embedded block, which includes circular and polygonal protrusions, and the circular and polygonal protrusions of the embedded block are nested in conjunction with the cylindrical portion and polygonal portion of the connecting hole.

[0018] Preferably, a base frame can be installed at the bottom of the barrel to support the barrel, thereby ensuring the stability of the barrel placement and a specific working height.

[0019] Preferably, the base frame may include a circular placement ring and support legs. The circular placement ring may be a circular ring structure with an L-shaped cross-section, the inner radius of which is the same as or slightly larger than the outer diameter of the bottom of the barrel, so that the barrel can be placed inside the circular placement ring and fixed by screws. The support legs are fixedly connected to the bottom of the circular placement ring. The number of support legs may be set to three, and they are bent outward to increase the stability of placement.

[0020] Preferably, the rotation drive component may include a motor and a pulley. The motor is mounted on a support frame, and the output shaft of the motor is coaxially and fixedly connected to the pulley. The lead screw is also coaxially and fixedly connected to the pulley. The two pulleys are connected by a belt, and the motor power is transmitted through the belt, thereby causing the lead screw to rotate. The motor may be a three-phase motor, which can drive the lead screw to rotate uniformly in both directions.

[0021] Preferred method: The controller's control method includes: the controller controls the rotary drive to drive the lead screw to rotate in the reverse direction, raising the top cover and clamping frame to the top of the lead screw; the lead screw continues to rotate in the reverse direction, causing the clamping frame and clamping unit to rotate, placing the coating sample on the clamping unit. The controller controls the inlet pipe to ensure that the corrosive liquid composition inside the barrel meets the testing requirements. The controller controls the heating component to heat the inside of the barrel to the target temperature. After the sample is placed, the controller controls the rotary drive to drive the lead screw to rotate in the forward direction. When the top cover and connecting sleeve reach their lowest point, the top cover seals the top of the barrel, forming a sealed corrosion space. The controller controls the mist generator to atomize the gas, and the rotary drive drives the lead screw to rotate, which in turn drives the clamping frame to rotate for corrosion.

[0022] Preferred method for liquid inlet: The liquid inlet pipe includes: detecting and obtaining the current concentration C of each component in the corrosive liquid. i Where i is the number of the corrosive liquid component. Obtain the experiment type, and then determine the target component concentration C based on the experiment type. i Then determine the current concentration C of the component. i Has the target component concentration C been achieved? i If yes, then the component with that number will not be injected; if no, then the injection pipe corresponding to that component will be controlled to inject liquid, and then a cycle of detection and judgment will be performed.

[0023] Preferably: the liquid inlet volume Where V0 is the current volume of the corrosive liquid inside the tank, α is the degree of dissociation of the corrosive liquid component numbered i at its current concentration, which can be obtained by looking up the component properties in a table, and C i T The standard concentration of the corrosive liquid component numbered i is the concentration of the liquid source connected to the inlet pipe. This concentration must be greater than or equal to the target component concentration. By combining this inlet method with inlet volume calculation, the concentration of each component can be rapidly fed and judged in real time, forming a progressive, stepped inlet system. As the inlet volume increases, it changes in a gradient, ensuring precise component control and avoiding slow ratio adjustments caused by excessively low dispersion. This improves the accuracy and intelligence of the solution preparation process.

[0024] Preferred: Atomization flow rate of the mist generator Where M is the sedimentation amount in the salt spray experiment, r is the inner wall radius of the barrel, which can be obtained from the equipment parameters, and β is the unit evaporation rate of the corrosive liquid at the target temperature. This method calculates and controls the atomization flow rate precisely, taking into account the influence of equipment parameters and evaporation rate, achieving intelligent control, making the experiment convenient and accurate.

[0025] The technical effects and advantages of this invention are as follows: The agitation of the coating sample within the tank agitates the mist, ensuring uniform distribution. The salt spray can flow across the surface of the coating sample, resulting in a uniform liquid film composition and preventing corrosion hindrance caused by droplet accumulation. This experimental equipment has a simple structure. The agitation of the coating sample within the tank, combined with centrifugal force and airflow, prevents droplet accumulation and uneven corrosion, improving the uniformity and objectivity of the corrosion experiment and facilitating accurate subsequent detection. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of a salt spray simulation test device for coating testing proposed in this invention.

[0027] Figure 2 This is a top view schematic diagram of a salt spray simulation test device for coating testing proposed in this invention.

[0028] Figure 3 The present invention proposes Figure 2 A partial sectional view of the structure at section AA.

[0029] Figure 4 This is a schematic diagram of the clamping unit in a salt spray simulation test device for coating testing proposed in this invention.

[0030] Figure 5 The present invention proposes Figure 4 A magnified schematic diagram of the local structure of element a.

[0031] Figure 6 This is a schematic cross-sectional view of the connecting sleeve in a salt spray simulation test device for coating testing proposed in this invention.

[0032] Figure 7 This is a schematic diagram of the upper part of the lead screw in a salt spray simulation test device for coating testing proposed in this invention.

[0033] Explanation of reference numerals in the attached drawings: 1. Barrel body; 2. Inlet pipe; 3. Base frame; 4. Drain pipe; 5. Mist generator; 6. Cavity ring; 7. Controller; 8. Rotation drive component; 9. Top cover; 10. Clamping frame; 11. Lead screw; 12. Nozzle; 13. Connecting rod; 14. Lower clamping rod; 15. Backing plate; 16. Connecting side plate; 17. Upper clamping rod; 18. Connecting hole; 19. Sliding groove; 20. Sliding block; 21. Optical shaft; 22. Embedded block; 23. Spring; 24. Spiral groove; 25. First ball bearing; 26. Connecting sleeve; 27. Second ball bearing; 28. Lower ring groove; 29. ​​Top ring groove. Detailed Implementation

[0034] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are used only to explain this disclosure, and should not be construed as limiting this disclosure. Rather, embodiments of this disclosure include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0035] Example 1

[0036] refer to Figures 1-3 This embodiment proposes a salt spray simulation test device for coating testing, used to conduct salt spray simulation tests on paint surface samples. The salt spray simulation test device for coating testing may include:

[0037] The barrel 1 has an internal corrosion space. The barrel 1 can be a cylindrical structure with a top cover 9. The bottom of the barrel 1 can be a conical structure, lower in the middle and higher around the edges. A drain pipe 4 is connected to the bottom of the barrel 1, and a control valve is installed on the drain pipe 4. By opening the valve, the corrosive liquid inside the barrel 1 can be discharged. The corrosive liquid is highly corrosive. The barrel 1 can be made of stainless steel with an internal anti-corrosion layer to prevent equipment damage. Alternatively, the barrel 1 can be made of glass, etc., but details are not provided here. A base frame 3 can be installed at the bottom of the barrel 1 to support it, ensuring the stability of the barrel 1 and a specific working height. The base frame 3 may include a circular placement ring and support legs. The circular placement ring may be an L-shaped circular ring structure with an inner radius that is the same as or slightly larger than the outer diameter of the bottom of the barrel 1, allowing the barrel 1 to be placed inside the circular placement ring and then fixed with screws. The support legs are fixedly connected to the bottom of the circular placement ring. Three support legs can be provided, bent outwards to increase stability. A liquid inlet pipe 2 may also be connected to the barrel 1, and the liquid inlet pipe 2 is connected to a control valve. Multiple liquid inlet pipes 2 can be provided, typically one, two, or three. The liquid inlet pipe 2 can connect to a liquid pump and a liquid source. The specific number of liquid inlet pipes 2 can be determined according to the experimental type. If the experimental equipment type is neutral salt spray (NSS) and the corrosive solution is NaCl solution, the number of liquid inlet pipes 2 can be set to one. The liquid inlet pipe 2 can connect to a tank containing NaCl solution, and the liquid can be pumped quantitatively into the barrel 1 via a liquid pump. Specific details are not elaborated here. If the experimental equipment type is acetic acid salt spray (AASS), and the corrosion solution is 5% NaCl + acetic acid, the number of inlet pipes 2 can be set to two. Inlet pipes 2 can be connected to tanks containing sodium chloride solution and acetic acid respectively, and a pump can quantitatively pump the liquid into the tank 1 according to the mixing ratio. Specific details are not elaborated here. If the experimental equipment type is copper accelerated salt spray (CASS), the number of inlet pipes 2 can be set to three. Inlet pipes 2 can be connected to tanks containing sodium chloride solution, acetic acid, and copper chloride respectively, and a pump can quantitatively pump the liquid into the tank 1 according to the mixing ratio. Specific details are not elaborated here. The specific number of inlet pipes 2 can be set according to actual needs. The experimental equipment type can also be cyclic corrosion (CCT), which is not elaborated here.

[0038] A mist generator 5 is installed on the base frame 3 or the barrel 1. The mist generator 5 is used to atomize the corrosive liquid inside the barrel 1. The atomization method can be compressed air atomization or ultrasonic atomization. Therefore, the mist generator 5 can be a compressed liquid pump or an ultrasonic atomizer. A cavity ring 6 is provided on the barrel 1, and nozzles 12 are provided on the inner wall of the barrel 1. The number of nozzles 12 can be set. The nozzles 12 are connected to the cavity ring 6. The mist generator 5 connects the bottom of the barrel 1 and the cavity ring 6. Under the action of the mist generator 5, the corrosive liquid inside the barrel 1 is atomized into gas and sprayed out from the nozzles 12 for corrosion. The size of the atomized particles of the nozzles 12 needs to meet the required standards, which will not be elaborated here. The nozzles 12 can be located on the upper part of the inner wall of the barrel 1, and can also be adjusted according to specific circumstances, which will not be elaborated here. A support frame can be fixedly installed on the barrel body 1 or the base frame 3. A lead screw 11 is rotatably mounted on the support frame. The lead screw 11 can be positioned above the barrel body 1 and at the axis of the barrel body 1, with its bottom end extending into the upper interior of the barrel body 1. A rotation drive 8 is connected to the lead screw 11 for driving its rotation. The rotation drive 8 can include a motor and a pulley. The motor is mounted on the support frame, and the output shaft of the motor is coaxially and fixedly connected to the pulley. The lead screw 11 is also coaxially and fixedly connected to the pulley. The two pulleys are connected by a belt, and the motor power is transmitted through the belt, thereby causing the lead screw 11 to rotate. The motor can be a three-phase motor, capable of driving the lead screw 11 to rotate uniformly in both directions. Two helical grooves 24 can be formed on the lead screw 11. The two helical grooves 24 can be evenly distributed, and the specific details are not elaborated here.

[0039] refer to Figures 6-7The top cover 9 has a disc structure with a through hole in the center. Two first ball bearings 25 are rotatably mounted on the side wall of the through hole. These two first ball bearings 25 can be positioned opposite each other and engage with a spiral groove 24. A connecting sleeve 26 is coaxially rotatably mounted on the bottom of the top cover 9. The connecting sleeve 26 also has a through hole in the center, and two second ball bearings 27 are rotatably mounted on the inner wall of the through hole on the connecting sleeve 26. These two second ball bearings 27 can be positioned opposite each other and engage with the spiral groove 24. The first ball bearings 25 and the second ball bearings 27 are nested inside the spiral groove 24. When the lead screw 11 rotates, a protrusion can be provided on the side wall of the top cover 9. This protrusion can engage with a support frame, which blocks the protrusion, thus restricting the rotation of the top cover 9. As the rotation of the lead screw 11 is restricted, the top cover 9 can be driven to rise and fall. The lower part of the lead screw 11 may have a lower groove 28. The plane of the lower groove 28 is consistent with the plane of the top cover 9, and both can be horizontally set. The lower groove 28 is located above the bottom of the spiral groove 24, and the distance between the lower groove 28 and the bottom of the spiral groove 24 is the same as the distance between the first ball 25 and the second ball 27. The two first balls 25 are on the same horizontal plane. When the lead screw 11 rotates in the forward direction, the top cover 9 is restricted from rotating, thereby driving the top cover 9 to move from top to bottom, and the first ball 25 and the second ball 27 roll in the spiral groove 24. When the top cover 9 and the connecting sleeve 26 are lowered to the lowest point, the second ball 27 is at the bottom position of the spiral groove 24, and the first ball 25 is at the position of the lower groove 28. When the lead screw 11 rotates, it can no longer drive the top cover 9 and connecting sleeve 26 to descend further. At this time, the top cover 9 is at the top of the barrel 1, and the barrel 1 restricts the descent of the top cover 9. As the lead screw 11 continues to rotate, the end of the spiral groove 24 restricts the second ball 27 to roll within it, while the first ball 25 rotates within the lower ring groove 28. The top cover 9 covers the top of the barrel 1, completing the seal of the barrel 1 and thus forming a sealed corrosion space. Continued rotation of the lead screw 11 can drive the connecting sleeve 26 to rotate on the top cover 9. The top of the lead screw 11 has a top ring groove 29, which can be horizontally positioned and connects to the top of the spiral groove 24. When the barrel 1 needs to be opened, the rotating drive 8 drives the lead screw 11 to rotate in the opposite direction. The second ball 27 rolls in the spiral groove 24. Because the spiral groove 24 drives the inclined surface, the connecting sleeve 26 is subjected to an upward reaction force, which causes the first ball 25 to enter the interior of the spiral groove 24. This can drive the top cover 9 and the connecting sleeve 26 to rise. When the top cover 9 and the connecting sleeve 26 move to the top, the first ball 25 is in the top ring groove 29. Because the spiral groove 24 has reached its end, the lead screw 11 continues to rotate, which can continue to drive the connecting sleeve 26 to rotate. At this time, the first ball 25 rolls in the top ring groove 29.To facilitate the lifting of the top cover 9 and allow the first ball bearing 25 to disengage from the lower groove 28 and enter the spiral groove 24 for orientation change, a sealing buffer ring can be installed at the bottom edge of the top cover 9, adapting to the top of the barrel 1. The buffer ring possesses elasticity and sealing properties, allowing for rapid rebound and orientation change under its elastic force, while also enhancing the assembly sealing of the barrel 1. The sealing buffer ring can be made of rubber or resin, details of which are omitted here. A clamping frame 10 is installed on the connecting sleeve 26, with several clamping units mounted on it. These units are used to clamp and fix the paint sample, thus placing the paint sample. Generally, the paint sample needs to be cut into a rectangle; the clamping units can be arranged in a circular array on the connecting sleeve 26 to complete the installation and fixation of the clamping units. The clamping units can be made of glass or fiberglass to avoid corrosion. To increase the number of units that can be placed, multiple clamping frames 10 can be fixed in a circular array on the connecting sleeve 26. The clamping frames 10 are distributed either tilted downwards or vertically downwards. If tilted, the tilt angle is between 15 and 30 degrees, although other values ​​are not excluded. The clamping units are arranged in a linear array on the clamping frames 10; details are not elaborated here. (Reference) Figures 4-5The clamping unit may include a connecting rod 13, an upper clamping rod 17, and a lower clamping rod 14. The connecting rod 13 may be inclined or be part of the clamping frame 10. The lower clamping rod 14 may be fixedly connected to the connecting rod 13. The upper clamping rod 17 is elastically slidable on the connecting rod 13 via an elastic sliding component. The upper clamping rod 17 is located above the lower clamping rod 14 and slides away from the lower clamping rod 14. When a paint sample is placed between the upper clamping rod 17 and the lower clamping rod 14, the upper clamping rod 17 elastically moves closer to the lower clamping rod 14, thereby clamping and fixing the paint sample. A backing plate 15 may be fixedly connected to the connecting rod 13 to increase the stability of the paint sample placement. When the clamping unit rotates with the clamping frame 10, the upper clamping rod 17 rotates with the connecting sleeve 26. This causes the upper clamping rod 17 to be subjected to centrifugal force and move closer to the lower clamping rod 14, thus making the clamping more stable and preventing the paint sample from falling off due to rotational speed. The elastic sliding assembly may include a sliding groove 19, a sliding block 20, and a spring 23. The sliding groove 19 is formed on the connecting rod 13, preferably through-hole in the side wall of the connecting rod 13. The sliding block 20 slides inside the sliding groove 19, and the sliding direction of the sliding block 20 is consistent with the clamping direction. A spring 23 is provided inside the sliding groove 19, causing the sliding block 20 to slide downwards towards the clamping rod 14. The upper clamping rod 17 can be fixedly connected to the sliding block 20. An optical axis 21 is fixedly provided inside the sliding groove 19. The sliding block 20 can be slidably sleeved on the optical axis 21, and the spring 23 is sleeved on the optical axis 21, thus stabilizing the sliding of the sliding block 20. A connecting side plate 16 can be fixedly mounted on the upper clamping rod 17. A connecting hole 18 is provided on the side wall of the connecting side plate 16, through which screws can be fixed to the sliding block 20, thus completing the installation of the upper clamping rod 17. The connecting side plate 16 can cover the outer surface of the sliding groove 19, thereby protecting the internal components of the sliding groove 19 and preventing corrosion. The connecting hole 18 may include a cylindrical portion and a polygonal portion. An embedded block 22 is provided on the sliding block 20, comprising circular and polygonal protrusions. The circular and polygonal protrusions of the embedded block 22 can fit and nest with the cylindrical and polygonal portions of the connecting hole 18, thereby ensuring stable installation of the upper clamping rod 17 and preventing rotation.

[0040] The interior of the barrel 1 can also be equipped with a heating component, which can heat the interior of the barrel 1 to a specified temperature. The heating component is existing technology and will not be described in detail here.

[0041] The interior of the tank 1 can also be equipped with a component detection device, which can detect the content of each component in the corrosive liquid. The component detection device is existing technology and will not be described in detail here.

[0042] The controller 7 can be installed on the barrel 1, the support frame, or remotely controlled. The controller 7 can be electrically connected to the mist generator 5, the rotary drive 8, the heating assembly, and the component detection device. The controller 7 controls the spray flow rate of the mist generator 5 and the driving speed and direction of the rotary drive 8. The controller 7 controls the rotary drive 8 to drive the lead screw 11 in the reverse direction, raising the top cover 9 and the clamping frame 10 to the top of the lead screw 11. At this time, the first ball bearing 25 is in the top groove 29 position. The lead screw 11 continues to rotate in the reverse direction, causing the clamping frame 10 and the clamping unit to rotate. This allows the paint sample to be placed on the clamping unit, avoiding operator rotation and enabling fixed-point operation, making the operation convenient and quick. The controller 7 controls the liquid inlet pipe 2 to ensure that the corrosive liquid components inside the barrel 1 meet the detection requirements. Specifically, it can detect and obtain the current concentration C of each component in the corrosive liquid. i Where i represents the number of the corrosive liquid component, and the numbering order can be NaCl, acetic acid coating, and copper chloride. Then, the experiment type is obtained, which can be selected or set via controller 7. The target component concentration C is then obtained based on the experiment type. i ', target component concentration C i 'This can be preset, details of which will not be elaborated here. Then determine the current concentration C of the component.' i Has the target component concentration C been achieved? i The target concentration here depends on the specific circumstances, such as whether the current concentration of the NaCl solution is equal to, greater than, or equal to the target component concentration C. i 5%. Acetic acid can be determined based on its pH value, specifically whether it is equal to or less than 3.3. Other cases will not be elaborated here. If yes, then the component with that number will not be injected; otherwise, the injection into the corresponding inlet pipe 2 will be controlled, and the injection volume... Where V0 represents the current volume of corrosive liquid inside tank 1. If the initial volume of corrosive liquid inside tank 1 is 0, a base volume of 5% sodium chloride solution can be injected into tank 1. The specific value depends on the equipment parameters of tank 1 and must meet the minimum detection requirements; details will not be elaborated here. α represents the degree of dissociation of corrosive liquid component numbered i at its current concentration, which can be obtained by looking up the component properties in a table. C i TThe standard concentration of the corrosive liquid component numbered i is the concentration of the liquid source connected to inlet pipe 2. This concentration must be greater than or equal to the target component concentration. Then, cyclic detection and judgment are performed. By combining this liquid feeding method with the calculation of the feeding volume, rapid feeding and real-time judgment of the concentration of each component can be achieved, forming a progressive, stepped liquid feeding system. As the feeding volume increases, the volume changes in a gradient, ensuring precise component control and avoiding slow ratio adjustment due to insufficient separation, thus improving the accuracy and intelligence of liquid preparation. Controller 7 controls the heating component to heat the interior of tank 1 to the target temperature. The target temperature can be obtained according to the experimental type. For example, the target temperature for neutral salt spray (NSS) and acetic acid salt spray (AASS) is 35℃, and the target temperature for copper accelerated salt spray (CASS) is 50℃. Of course, staged target temperatures can also be set as needed, but details are not elaborated here. After the sample is placed, the controller 7 controls the rotating drive 8 to drive the lead screw 11 to rotate forward. When the top cover 9 and the connecting sleeve 26 reach their lowest point, the second ball 27 is at the bottom of the spiral groove 24, and the first ball 25 is at the lower ring groove 28. The rotation of the lead screw 11 prevents the top cover 9 and connecting sleeve 26 from descending further. At this point, the top cover 9 is at the top of the barrel 1, and the barrel 1 restricts the descent of the top cover 9. The lead screw 11 continues to rotate, and the end of the spiral groove 24 restricts the second ball 27 from rolling within it. The first ball 25 rotates within the lower ring groove 28. The top cover 9 covers the top of the barrel 1, completing the seal of the barrel 1 and forming a sealed corrosion space. The controller 7 controls the mist generator 5 to atomize the mist, and the atomization flow rate of the mist generator 5... The unit is ml / h. M represents the deposition rate in the salt spray experiment, which can be input via controller 7, and the value is typically 1–2 mL / (h·80cm³). 2 The numerical settings for this component must meet experimental standards, which will not be elaborated here. r is the inner wall radius of barrel 1, which can be obtained from the equipment parameters; its unit is cm, and will not be elaborated here. β is the unit evaporation rate of the corrosive liquid at the target temperature, with units of ml / (h·cm). 2The concentration of salt spray can be obtained through experiments on evaporation reduction at this temperature, details of which will not be elaborated here. This method calculates and controls the atomization flow rate precisely, taking into account the influence of equipment parameters and evaporation rate, achieving intelligent control. The experiment is convenient and accurate. The rotating drive component 8 drives the lead screw 11 to rotate, which in turn drives the clamping frame 10 to rotate. Its rotation speed can be set empirically, details of which will not be elaborated here. The agitation of the coating sample inside the stirring tank 1 agitates the mist, ensuring uniform distribution. The salt spray can flow on the surface of the coating sample, resulting in a uniform liquid film composition and preventing corrosion caused by droplet accumulation. After the experiment, when the barrel 1 needs to be opened, the controller 7 controls the rotating drive 8 to drive the lead screw 11 to rotate in the opposite direction. The second ball 27 rolls in the spiral groove 24. Because the spiral groove 24 drives the inclined surface, the connecting sleeve 26 is subjected to an upward reaction force, which causes the top cover 9 and the connecting sleeve 26 to move upward. This allows the first ball 25 to enter the interior of the spiral groove 24, thus driving the top cover 9 and the connecting sleeve 26 to rise upward. When the top cover 9 and the connecting sleeve 26 move to the top, the first ball 25 is now inside the top ring groove 29. Since the spiral groove 24 has reached its end, the lead screw 11 continues to rotate, which can specifically drive the clamping frame 10 to rotate. At this time, the first ball 25 rolls inside the top ring groove 29. The paint sample on the clamping frame 10 can then be removed for testing. This experimental equipment has a simple structure. By stirring the paint sample inside the barrel 1, the centrifugal force and air flow prevent the accumulation of droplets on the paint sample, which would cause uneven corrosion. This improves the uniformity of the corrosion experiment and the objectivity of the detection, and facilitates accurate detection in the later stages.

[0043] Example 2

[0044] A funnel can be installed inside the barrel 1, and a graduated cylinder is connected to the funnel and located on the outer wall of the barrel 1. The area of ​​the funnel can be 80 square centimeters, but other values ​​are not excluded. By setting the funnel and graduated cylinder, the sedimentation amount can be verified to avoid experimental errors caused by inaccurate control.

[0045] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this disclosure can be achieved, and this is not limited herein.

[0046] The specific embodiments described above do not constitute a limitation on the scope of protection of this disclosure. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A salt spray simulation test device for coating testing, characterized in that, The salt spray simulation test equipment for coating testing includes: The barrel and the top cover together form a corrosion space, which is used to hold corrosive liquids; a heating component for heating at a specified temperature is installed inside the barrel. A mist generator is used to atomize the corrosive liquid inside the barrel. The barrel is provided with a cavity ring, and a nozzle is provided on the inner wall of the barrel. The nozzle is connected to the cavity ring, and the mist generator is connected to the bottom of the barrel and the cavity ring. The clamping frame is equipped with multiple clamping units for fixing the paint sample. A rotation drive component, which is connected to the clamping frame via a transmission, is used to drive the clamping frame to rotate; The controller is electrically connected to the fog generator, the rotary drive, and the heating assembly. A support frame is fixedly installed on the barrel body to restrict the rotation of the top cover. A lead screw is rotatably mounted on the support frame, positioned above the barrel body, with its bottom end extending into the upper interior of the barrel body. A rotation drive is connected to the lead screw. A through hole is opened in the middle of the top cover, and two first ball bearings are rotatably mounted on the side wall of the through hole, with the two first ball bearings facing each other. A connecting sleeve is rotatably mounted coaxially at the bottom of the top cover, and the connecting sleeve also has a through hole in the middle. Two second ball bearings are rotatably mounted on the inner wall of the through hole on the connecting sleeve, with the two second ball bearings facing each other. A lower groove is opened at the lower part of the lead screw, and the plane of the lower groove is consistent with the plane of the top cover. The lower groove is located above the bottom of the spiral groove, and the distance between the lower groove and the bottom of the spiral groove is the same as the distance between the first and second ball bearings. A top groove is opened at the top of the lead screw, and the top groove is connected to the top of the spiral groove. The first ball bearings, second ball bearings, spiral groove, lower groove, and top groove cooperate with each other. A circular array of clamping frames is arranged on the connecting sleeve.

2. The salt spray simulation test equipment for coating testing according to claim 1, characterized in that, The barrel is connected to an inlet pipe, which connects to a liquid pump and a liquid source; a component detection device is used to detect the content of various components in the corrosive liquid.

3. The salt spray simulation test equipment for coating testing according to claim 1, characterized in that, The clamping unit includes a connecting rod, an upper clamping rod, and a lower clamping rod. The lower clamping rod is fixedly connected to the connecting rod, and the upper clamping rod is elastically slidable on the connecting rod via an elastic sliding component. The upper clamping rod is located above the lower clamping rod.

4. The salt spray simulation test equipment for coating testing according to claim 3, characterized in that, A connecting plate is fixed on the connecting rod.

5. The salt spray simulation test equipment for coating testing according to claim 3, characterized in that, The elastic sliding assembly includes a sliding groove, a sliding block, and a spring. The sliding groove is formed on the connecting rod, and the sliding block slides inside the sliding groove. The sliding direction of the sliding block is consistent with the clamping direction. A spring is provided inside the sliding groove, and the spring causes the sliding block to slide downward towards the clamping rod. The upper clamping rod is fixedly connected to the sliding block.

6. The salt spray simulation test equipment for coating testing according to claim 5, characterized in that, A connecting side plate is fixedly installed on the upper clamping rod. A connecting hole is opened on the side wall of the connecting side plate. Screws are fixed to the sliding block through the connecting hole. The connecting side plate covers the outer surface of the sliding groove.

7. The salt spray simulation test equipment for coating testing according to claim 6, characterized in that, The connecting hole includes a cylindrical part and a polygonal part. The sliding block is provided with an embedded block, which includes circular and polygonal protrusions. The circular and polygonal protrusions of the embedded block are nested in conjunction with the cylindrical part and polygonal part of the connecting hole.

8. The salt spray simulation test equipment for coating testing according to claim 3, characterized in that, A sealing buffer ring is installed at the bottom edge of the top cover.

9. The salt spray simulation test equipment for coating testing according to claim 3, characterized in that, The side wall of the top cover is provided with protrusions, which cooperate with the support frame to restrict the rotation of the top cover.

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