Salt spray corrosion testing apparatus for automotive interior composites

Abstract

The present application relates to salt spray corrosion test technical field, specifically, it is a kind of salt spray corrosion test equipment for automobile interior composite material, it includes salt spray chamber, support frame being arranged in the inside of salt spray chamber, liquid storage tank being arranged in the inside of salt spray chamber and salt spray tower being arranged in the inside of salt spray chamber and being communicated with liquid storage tank, the top of support frame is provided with multiple horizontal sliding liquid delivery pipe, the outer wall of liquid delivery pipe is provided with through hole for drop, the inside of liquid delivery pipe is provided with drop control assembly corresponding to the position of through hole, drop control assembly includes arc cover, liquid passage hole being arranged in the side wall of arc cover and flow channel structure being arranged in the inside of arc cover, flow channel structure includes confluence flow channel, throttle flow channel and direction-changing flow channel.This equipment can simulate the local concentrated corrosion scene of automobile interior material under different temperature difference, overcome the defect of single traditional salt spray chamber test mode.

Description

Technical Field

[0001] This invention relates to the field of salt spray corrosion testing technology, and more specifically, to salt spray corrosion testing equipment for automotive interior composite materials. Background Technology

[0002] In the field of new materials-related services, automotive interior composite materials are in long-term contact with liquids containing corrosive media such as human sweat and air conditioning condensate during vehicle service. The salt in these liquids will form a localized wetting and drying environment on the material surface, causing corrosion and aging of the material, which in turn affects the mechanical properties, appearance and service life of the interior parts.

[0003] In the prior art, salt spray testing machines are the most widely used corrosion testing equipment. They simulate the salt spray corrosion of the marine environment through spraying. However, traditional salt spray testing machines have obvious defects. For example, Chinese patent CN206270221U discloses a salt spray machine for testing the salt spray corrosion resistance of automotive paint, including a salt spray chamber. The upper part of the inner cavity of the salt spray chamber is provided with a bracket, which includes several support rods. A salt spray tower is vertically arranged in the middle of the inner cavity of the salt spray chamber. The salt spray chamber is also provided with a clamping device for clamping the test sample.

[0004] The diffuse spray of the aforementioned salt spray machine ensures that salt spray corrosion is evenly distributed across the material surface, while corrosion of real interior components often concentrates in localized weak areas (such as seams, holes, and coating defects). For example, sweat droplets falling onto material seams can accumulate due to capillary action and remain there for a long time, causing the corrosion rate in that area to be much higher than in other parts. Traditional salt spray machines cannot simulate localized concentrated corrosion, resulting in uniform corrosion of the material as a whole during testing. This fails to expose the risk of localized failures in actual service, leading to poor correlation between test results and real service environments. Summary of the Invention

[0005] This invention provides a salt spray corrosion testing device for automotive interior composite materials. By setting a dripping component in the salt spray chamber that can adaptively adjust the dripping frequency according to temperature, it solves the problem mentioned in the background art, namely: traditional salt spray corrosion testing devices simulate a single scenario and cannot simulate the localized concentrated corrosion environment of interior parts, resulting in poor correlation between test results and real service environment.

[0006] To achieve the above objectives, the present invention provides a salt spray corrosion testing device for automotive interior composite materials, comprising a salt spray chamber with a cover, a support frame disposed inside the salt spray chamber, a liquid storage tank disposed inside the salt spray chamber, and a salt spray tower disposed inside the salt spray chamber and connected to the liquid storage tank. Multiple horizontally sliding infusion tubes are disposed above the support frame. The outer wall of each infusion tube has through holes for dripping. A drip control component corresponding to the position of the through holes is disposed inside the infusion tube. The drip control component includes an arc-shaped cover, a liquid passage hole opened on the side wall of the arc-shaped cover, and a flow channel structure disposed inside the arc-shaped cover. The flow channel structure includes a confluence flow channel, a throttling flow channel, and a deflection flow channel.

[0007] In the above technical solution, in the first state, the brine flows out through the confluence channel, the throttling channel and the through hole to form low-frequency large droplets. In the second state, the brine temperature reaches a preset threshold, and the brine flows out through the confluence channel, the deflection channel and the through hole to form high-frequency small droplets.

[0008] Based on the above, an inner shell is fixedly installed inside the salt spray chamber, a first heating mechanism is provided in the space between the salt spray chamber and the inner shell, a second heating mechanism is provided inside the liquid storage tank, and the support frame, liquid storage tank and salt spray tower are fixedly installed inside the inner shell.

[0009] The inner wall of the inner shell is fixedly installed with fixing blocks on both sides. The fixing blocks have slide rails inside, and sliders are slidably installed inside the slide rails. The infusion tube is fixedly installed on the opposite side of the sliders on both sides.

[0010] Adjacent infusion tubes are connected by connecting hoses. One of the outermost infusion tubes is fixedly connected to an inlet hose, and the other outermost infusion tube is fixedly connected to an outlet hose. The end of the inlet hose away from one of the outermost infusion tubes is connected to the inside of the storage tank via a water pump, and the end of the outlet hose away from the other outermost infusion tube is connected to the inside of the storage tank.

[0011] A filter plate is fixedly connected to the inner wall of the inner shell. A suction tube is fixedly installed inside the filter plate, and the top of the suction tube is connected to the end of the inlet hose away from one of the outermost inlet tubes through a three-way valve.

[0012] The drip control assembly also includes a first guide plate and a second guide plate fixedly installed inside the arc-shaped cover. The inner wall of the arc-shaped cover and the first guide plate form a confluence channel, and the first guide plate and the second guide plate form a throttling channel. Multiple staggered baffles are fixedly installed inside the throttling channel. A deflection channel is opened on the outer wall of the second guide plate, and a memory elastic element is fixedly installed on the inner wall of the deflection channel.

[0013] The memory elastic element is a memory metal plate.

[0014] A drip nozzle is fixedly installed on the outer wall of the infusion tube at the corresponding position of the through hole, and a leak head is connected to the bottom end of the drip nozzle by a thread.

[0015] The inside of the dropper is filled with a microporous material.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This salt spray corrosion testing equipment for automotive interior composite materials utilizes a droplet control component with throttling and redirecting channels. It automatically switches channels based on the thermal deformation of a memory elastic element, and, combined with precise temperature control by the first and second heating mechanisms, achieves a dynamic adjustment effect, forming low-frequency large droplets at low temperatures and high-frequency small droplets at high temperatures. This simulates localized concentrated corrosion scenarios of automotive interior materials under different temperature differences, overcoming the limitations of traditional salt spray chamber testing methods and significantly improving the correlation between test results and the actual service environment of the materials.

[0017] 2. This salt spray corrosion testing equipment for automotive interior composite materials utilizes microporous material within the drip nozzle to ensure droplet dispersion through capillary action. Simultaneously, a slide rail and slider move the infusion tube horizontally to adjust the drip position, and a filter plate filters the returning salt solution. This achieves stable droplet formation, precise localization of corrosion points, and clean circulation of the test medium. It organically combines uniform salt spray background corrosion testing with targeted droplet impact testing, improving the equipment's adaptability to different test areas of the material and effectively ensuring the continuity and reliability of the testing process. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the installation of the infusion tube in this invention; Figure 3 This is a schematic diagram of the installation of the support frame in this invention; Figure 4 This is a schematic diagram of the installation of the connecting hose in this invention; Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A; Figure 6 This is a cross-sectional view of the infusion tube in this invention; Figure 7 This is a schematic diagram of the installation of the arc-shaped cover in this invention; Figure 8 This is a cross-sectional view of the arc-shaped cover in this invention; Figure 9 This is a schematic diagram of the first state of the infusion tube in this invention; Figure 10This is a schematic diagram of the second state of the infusion tube in the present invention.

[0019] The meanings of the labels in the diagram are as follows: 100. Salt spray chamber; 101. Chamber cover; 102. Inner shell; 103. Support frame; 104. Liquid storage tank; 105. Salt spray tower; 200. First heating mechanism; 201. Fixing block; 202. Slide rail; 203. Slider; 204. Infusion tube; 205. Inlet hose; 206. Connecting hose; 207. Outlet hose; 208. Through hole; 209. Straw; 210. Three-way valve; 211. Filter plate; 212. Second heating mechanism; 300. Arc-shaped cover; 301. Liquid passage hole; 302. First guide plate; 303. Second guide plate; 304. Converging flow channel; 305. Throttling flow channel; 306. Directional flow channel; 307. Memory elastic element; 308. Baffle; 400. Dropper nozzle; 401. Microporous material; 402. Leak head. Detailed Implementation

[0020] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0021] Therefore, to address the problem that traditional salt spray corrosion testing equipment has a limited simulation scenario and cannot simulate the localized concentrated corrosion environment experienced by interior parts, resulting in poor correlation between test results and real service environments, Example 1, referencing... Figures 1-3 As shown, this invention discloses a salt spray corrosion testing device for automotive interior composite materials, including a salt spray chamber 100 with a cover 101, a support frame 103 disposed inside the salt spray chamber 100, a liquid storage tank 104 disposed inside the salt spray chamber 100, and a salt spray tower 105 disposed inside the salt spray chamber 100 and communicating with the liquid storage tank 104. Multiple horizontally sliding liquid delivery pipes 204 are disposed above the support frame 103. (Combined with...) Figure 7 and Figure 8 The outer wall of the infusion tube 204 is provided with a through hole 208 for dripping. The inside of the infusion tube 204 is provided with a drip control component corresponding to the position of the through hole 208. The drip control component includes an arc-shaped cover 300, a liquid passage hole 301 opened on the side wall of the arc-shaped cover 300, and a flow channel structure provided inside the arc-shaped cover 300. The flow channel structure includes a converging flow channel 304, a throttling flow channel 305, and a deflecting flow channel 306.

[0022] It should be noted that the droplet control component achieves dynamic adjustment of the droplet shape by switching the flow channel structure. For example... Figure 9 As shown, in the first state, the salt solution flows out through the confluence channel 304, the throttling channel 305, and the through-hole 208 to form low-frequency large droplets. For example... Figure 10 As shown, in the second state, the brine temperature reaches a preset threshold, and the brine flows out through the confluence channel 304, the deflection channel 306 and the through hole 208 to form high-frequency small droplets.

[0023] This equipment can combine temperature changes with the changes in large and small droplets to further simulate the localized concentrated corrosion environment encountered by automotive interior composite materials in actual service. That is, large droplets are formed at low temperatures and small droplets are formed at high temperatures, thus more realistically reflecting the corrosion behavior of materials under different environments and improving the correlation between test results and real working conditions.

[0024] Furthermore, returning to Figure 8 As shown, the drip control assembly also includes a first guide plate 302 and a second guide plate 303 fixedly installed inside the arc-shaped cover 300. The inner wall of the arc-shaped cover 300 and the first guide plate 302 form a confluence channel 304. The first guide plate 302 and the second guide plate 303 form a throttling channel 305. Multiple staggered baffles 308 are fixedly installed inside the throttling channel 305. A deflection channel 306 is opened on the outer wall of the second guide plate 303. A memory elastic element 307 is fixedly installed on the inner wall of the deflection channel 306.

[0025] The specific principle of droplet formation is as follows: In the first state, the salt solution needs to flow through the throttling channel 305 with staggered baffles 308 inside. The channel structure is narrow and tortuous, which generates significant throttling resistance to the liquid flow, thereby limiting the flow rate of the salt solution. This makes the salt solution accumulate at the through hole 208 at a slower speed. Before the droplets can overcome the surface tension and detach under the action of gravity, they can converge into a larger volume, thus forming a low-frequency large droplet.

[0026] The shape memory elastic element 307 is preferably a shape memory metal plate. In the second state, when the brine temperature reaches a preset threshold, the shape memory elastic element 307 deforms due to heat, thereby opening the deflection channel 306. This channel has a short path and low flow resistance, allowing the brine to pass through quickly and significantly increasing the flow rate. The high-velocity brine cannot accumulate for a long time at the through hole 208 due to its large momentum, and quickly disperses and detaches with a small volume, thus forming high-frequency small droplets.

[0027] Combination Figure 6 As shown, a drip nozzle 400 is fixedly installed on the outer wall of the infusion tube 204 at the corresponding position of the through hole 208, and a leak head 402 is threadedly connected to the bottom end of the drip nozzle 400. The interior of the drip nozzle 400 is filled with a microporous material 401.

[0028] By incorporating a porous microporous material 401, it is possible to further ensure that the flowing salt solution is converted into discrete droplets. The dense capillary pores within the material can divert and adsorb the salt solution, using capillary forces to uniformly guide the liquid to the various tiny pores at the bottom of the material. When gravity overcomes the surface tension at the pores, the salt solution falls off one by one as individual droplets. Furthermore, the microporous material 401 possesses resistance to salt spray, temperature resistance, and chemical inertness; suitable materials include porous sintered stainless steel, porous titanium, and other porous metal materials.

[0029] Back Figure 3 As shown, an inner shell 102 is fixedly installed inside the salt spray chamber 100. A first heating mechanism 200 is provided in the space between the salt spray chamber 100 and the inner shell 102. A second heating mechanism 212 is provided inside the liquid storage tank 104. The support frame 103, the liquid storage tank 104 and the salt spray tower 105 are fixedly installed inside the inner shell 102.

[0030] The first heating mechanism 200 and the second heating mechanism 212 control the ambient temperature and salt solution temperature inside the salt spray chamber 100, respectively, to ensure the precise triggering of the memory elastic element 307 of the drip control component. Simultaneously, it prevents the memory elastic element 307 from unexpectedly cooling and rebounding during the test due to low ambient temperature, thus ensuring that the equipment can reliably and stably switch between the two drip modes, achieving accurate simulation of corrosion testing under specific temperature conditions.

[0031] Looking again Figure 4 The inner wall of the inner shell 102 is fixedly installed on both sides of the inner wall with a fixing block 201. The fixing block 201 has a slide rail 202 inside, and a slider 203 is slidably installed inside the slide rail 202. The infusion tube 204 is fixedly installed on the opposite side of the slider 203 on both sides.

[0032] By cooperating with the slider 203 and the slide rail 202, multiple infusion tubes 204 can be controlled to slide flexibly horizontally. On the one hand, the material to be tested can be placed on the support 103. On the other hand, it is convenient to adjust the drip position to simulate local corrosion scenarios in different parts of the material to be tested (such as droplet contact at seams and holes).

[0033] Adjacent infusion tubes 204 are connected by connecting hoses 206. One of the outermost infusion tubes 204 is fixedly connected to an inlet hose 205, and the other outermost infusion tube 204 is fixedly connected to an outlet hose 207. The end of the inlet hose 205 furthest from one of the outermost infusion tubes 204 is connected to the interior of the storage tank 104 via a water pump. The end of the outlet hose 207 furthest from the other outermost infusion tube 204 is also connected to the interior of the storage tank 104. The connection of the inlet hose 205 and the outlet hose 207 to the storage tank 104 enables the circulation of the saline solution, ensuring a uniform saline supply to each infusion tube 204.

[0034] Among them, such as Figure 3 As shown, a filter plate 211 is fixedly connected to the inner wall of the inner shell 102. A suction tube 209 is fixedly installed inside the filter plate 211, and the top end of the suction tube 209 is connected to the end of the inlet hose 205 away from one of the outermost inlet tubes 204 through a three-way valve 210.

[0035] It should be noted that a temporary liquid storage chamber is formed between the bottom of the filter plate 211 and the bottom of the inner shell 102. When the brine is sprayed by the salt spray tower 105 and acts on the drip nozzle 400, it flows over the surface of the material to be tested and continues to fall. The filter plate 211 intercepts and filters the debris, fibers, and solid impurities that fall off the material to be tested due to corrosion or aging during the testing process. By controlling the flow direction of the three-way valve 210, after the brine in the storage tank 104 is used up, it can be drawn from the temporary liquid storage chamber through the suction pipe 209 for further use, realizing the further utilization of waste brine.

[0036] Working principle: The salt spray tower 105 serves as the basic environmental construction module, continuously spraying salt spray into the salt spray chamber 100 to provide a uniform and continuous background corrosion environment for the test material placed on the support 103, simulating the overall aging of the test material under long-term exposure to a high-humidity, high-salt atmosphere. Simultaneously, multiple liquid delivery pipes 204 located within the spray tower area do not operate independently but are interspersed within the salt spray field, using a drip control component to perform superimposed, locally enhanced corrosion on the material surface.

[0037] First, the water pump is controlled to operate. Under the coordinated temperature control of the first heating mechanism 200 and the second heating mechanism 212, when the tank and the brine are at a low temperature, the brine is blocked by the throttling channel 305. With the capillary action of the microporous material 401, low-frequency large droplets are dripped onto the surface of the material wetted by the salt spray, simulating the severe corrosion caused by the accumulation of condensate or local leakage under low temperature conditions.

[0038] After the test material is tested at low temperature, multiple infusion tubes 204 are converged towards the salt spray tower 105, allowing the same test material to be replaced from both sides of the tubes 204. Under the same salt spray corrosion environment, the water pump is controlled to operate. When the temperature rises to a preset threshold, the memory elastic element 307 opens the deflection channel 306, and the infusion tubes 204 switch to spraying high-frequency small droplets, simulating the accelerated corrosion caused by water evaporation or splashing under high temperature and high humidity conditions.

[0039] In addition, a batch of test materials can be set up to be subjected only to salt spray corrosion environment, and this batch of test materials can be used as a reference standard that has not been subjected to droplet test.

[0040] At the same time, the infusion tube 204 can move horizontally to perform targeted droplet impact testing on key parts (such as joints) of the material under test, achieving a balance between comprehensive corrosion by salt spray and localized damage by droplets.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A salt spray corrosion testing device for automotive interior composite materials, comprising a salt spray chamber (100) with a cover (101), a support frame (103) disposed inside the salt spray chamber (100), a liquid storage tank (104) disposed inside the salt spray chamber (100), and a salt spray tower (105) disposed inside the salt spray chamber (100) and communicating with the liquid storage tank (104), characterized in that: The support frame (103) is provided with a plurality of horizontally sliding infusion tubes (204). The outer wall of the infusion tubes (204) is provided with through holes (208) for dripping. The infusion tubes (204) are provided with dripping control components corresponding to the positions of the through holes (208). The dripping control components include an arc-shaped cover (300), a liquid passage hole (301) opened on the side wall of the arc-shaped cover (300), and a flow channel structure provided inside the arc-shaped cover (300). The flow channel structure includes a confluence flow channel (304), a throttling flow channel (305), and a deflection flow channel (306). In the first state, the brine flows out through the confluence channel (304), the throttling channel (305), and the through hole (208) to form low-frequency large droplets. In the second state, the brine temperature reaches a preset threshold, and the brine flows out through the confluence channel (304), the deflection channel (306), and the through hole (208) to form high-frequency small droplets. The drip control assembly further includes a first guide plate (302) and a second guide plate (303) fixedly installed inside the arc-shaped cover (300). The inner wall of the arc-shaped cover (300) and the first guide plate (302) form a confluence channel (304), and the first guide plate (302) and the second guide plate (303) form a throttling channel (305). The deflection channel (306) is opened on the outer wall of the second guide plate (303), and a memory elastic element (307) is fixedly installed on the inner wall of the deflection channel (306).

2. The salt spray corrosion testing equipment according to claim 1, characterized in that: The salt spray chamber (100) has an inner shell (102) fixedly installed inside. A first heating mechanism (200) is provided in the interlayer space between the salt spray chamber (100) and the inner shell (102). A second heating mechanism (212) is provided inside the liquid storage tank (104). The support frame (103), the liquid storage tank (104) and the salt spray tower (105) are fixedly installed inside the inner shell (102).

3. The salt spray corrosion testing equipment according to claim 2, characterized in that: The inner wall of the inner shell (102) is fixedly installed on both sides of the inner wall with a fixing block (201). The fixing block (201) has a slide rail (202) inside. The slide rail (202) has a slider (203) slidably installed inside. The infusion tube (204) is fixedly installed on the opposite side of the slider (203) on both sides.

4. The salt spray corrosion testing equipment according to claim 3, characterized in that: The adjacent infusion tubes (204) are connected by connecting hoses (206). One of the outermost infusion tubes (204) is fixedly connected to an inlet hose (205), and the other outermost infusion tube (204) is fixedly connected to an outlet hose (207). The end of the inlet hose (205) away from one of the outermost infusion tubes (204) is connected to the inside of the storage tank (104) through a water pump. The end of the outlet hose (207) away from the other outermost infusion tube (204) is connected to the inside of the storage tank (104).

5. The salt spray corrosion testing equipment according to claim 4, characterized in that: A filter plate (211) is fixedly connected to the inner wall of the inner shell (102). A suction tube (209) is fixedly installed inside the filter plate (211). The top end of the suction tube (209) is connected to the end of the inlet hose (205) away from one of the outermost inlet tubes (204) through a three-way valve (210).

6. The salt spray corrosion testing equipment according to claim 1, characterized in that: The throttling channel (305) is fixedly equipped with a plurality of staggered baffles (308).

7. The salt spray corrosion testing equipment according to claim 6, characterized in that: The memory elastic element (307) is a memory metal plate.

8. The salt spray corrosion testing equipment according to claim 1, characterized in that: A drip nozzle (400) is fixedly installed on the outer wall of the infusion tube (204) at the corresponding position of the through hole (208), and a leak head (402) is connected to the bottom end of the drip nozzle (400) by a thread.

9. The salt spray corrosion testing equipment according to claim 8, characterized in that: The interior of the drip nozzle (400) is filled with a microporous material (401).

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