A neutral salt spray test solution preparation device

Abstract

This utility model belongs to the field of salt spray test solution preparation technology. Specifically, this utility model relates to a neutral salt spray test solution preparation device. The device includes a salt water tank and a pure water preparation structure connected to the salt water tank. A titration structure is provided at the opening of the salt water tank, and a detection device is provided inside the salt water tank. After preparation, pure water enters the salt water tank. A first jog titration valve is activated to release dilute hydrochloric acid as small droplets into the salt water tank. A second jog titration valve is activated to add sodium hydroxide solution as small droplets into the salt water tank, thus preparing a solution that meets the requirements. The use of dedicated equipment for solution preparation saves manpower.

Description

Technical Field

[0001] This utility model belongs to the field of salt spray test solution preparation technology. Specifically, this utility model relates to a neutral salt spray test solution preparation device. Background Technology

[0002] Salt spray testing is a core environmental testing method for evaluating the corrosion resistance of materials and surface treatment layers. Neutral salt spray testing (NSS testing), which simulates neutral corrosive environments such as the marine atmosphere, is explicitly designated as a basic test item by standards such as GB / T10125 "Artificial Atmosphere Corrosion Test Solution Salt Spray Test". The core prerequisite for this test is solution preparation; the purity and parameter stability of the solution directly determine the accuracy of the test results. However, when large quantities of solution are required, manual preparation is time-consuming and labor-intensive.

[0003] Chinese patent (publication number: 110687040A) discloses a salt spray generator and a method for generating salt spray. The generator includes a container with an air inlet and a mist outlet channel. A pulsator driven by a power system is installed inside the container cavity. A reef structure is installed inside the container cavity and around the pulsator, with the reef structure partially or completely exposed above the salt solution surface. The method for generating salt spray includes: injecting a prepared salt solution into the cavity of the salt spray generator, ensuring the salt solution surface is not higher than the center of the reef structure; turning on the power system to rotate the pulsator and fan inside the salt spray generator at a speed of 800-1500 r / min; placing a wire mesh filter with a pore size no larger than 2 μm in the mist outlet channel of the salt spray generator, and introducing the salt spray filtered by the wire mesh filter into a test chamber for later use. However, this salt spray generator cannot meet the needs of large-scale solution preparation. Utility Model Content

[0004] This utility model is designed to solve the above-mentioned problems and aims to provide a neutral salt spray test solution preparation device that can prepare a large number of test solutions and save manpower. To achieve the above objective, the technical solution adopted by this utility model is as follows: a neutral salt spray test solution preparation device, including a salt water tank, including a pure water preparation structure, the pure water preparation structure being connected to the salt water tank, a titration structure being provided at the opening of the salt water tank, and a detection device being provided inside the salt water tank.

[0005] The titration structure includes a fixing plate, which is installed above the brine tank and connected to the wall. A dilute hydrochloric acid storage tank, a sodium hydroxide solution storage tank, and a sodium chloride inlet pipe are connected to the fixing plate. A first jog titration valve is installed at the outlet of the dilute hydrochloric acid storage tank, and a second jog titration valve is installed at the outlet of the sodium hydroxide solution storage tank.

[0006] The pure water preparation structure includes a PP cotton filter element, a granular activated carbon filter element, a reverse osmosis membrane, a purification column, and a booster pump. The inlet of the PP cotton filter element housing is connected to the tap water inlet, the outlet of the PP cotton filter element housing is connected to the inlet of the granular activated carbon filter element housing, the outlet of the granular activated carbon filter element housing is connected to the inlet of the booster pump, the outlet of the booster pump is connected to the inlet of the reverse osmosis membrane housing, the outlet of the reverse osmosis membrane housing is connected to the inlet of the purification column, and the outlet of the purification column is connected to the inlet of the brine tank.

[0007] The detection device includes a water level sensor, which is installed inside a brine tank. The brine tank is also equipped with a salt concentration sensor and a pH sensor.

[0008] A stirring motor is installed on one side of the brine tank. The output shaft of the stirring motor is located inside the brine tank and is connected to a fan.

[0009] The brine tank is connected to a brine outlet pipe.

[0010] The bottom of the brine tank is equipped with a wastewater discharge port.

[0011] The purification column outlet is connected to a pure water outlet pipe.

[0012] The technical effects of this utility model are as follows: When the tap water inlet valve is opened, tap water flows sequentially into the PP cotton filter and the granular activated carbon filter. The PP cotton filter filters out large particles of impurities such as sediment and rust, preventing damage to subsequent filter elements. The granular activated carbon filter adsorbs residual chlorine, organic matter, and odors, further filtering out tiny suspended solids. The pretreated water flows into the booster pump, which increases the water pressure, and the high-pressure water enters the reverse osmosis membrane. The reverse osmosis membrane traps dissolved salts, heavy metals, bacteria, and large organic molecules, allowing only water molecules to pass through. The water then flows into the purification column, where the ion exchange resin removes residual ions and trace organic matter, raising the water quality to laboratory-grade pure water. The valve from the purification column outlet to the brine tank is opened, and pure water is injected into the brine tank. A water level sensor monitors the liquid level in real time. When the water level reaches the preset preparation volume, the valve is closed, stopping the water injection. The operator manually adds sodium chloride to the brine tank through the sodium chloride inlet pipe. Then, the stirring motor is started; the motor's output shaft drives the fan to agitate the settled sodium chloride particles, accelerating their dissolution. Next, the first jog titration valve releases dilute hydrochloric acid as small droplets into the brine tank; the second jog titration valve releases sodium hydroxide solution as small droplets into the brine tank. A pH sensor continuously monitors the solution's acidity and alkalinity, adding dilute hydrochloric acid and sodium hydroxide solution until the pH reaches the target level. After adjustment, the stirring motor is turned off, and the solution is allowed to stand for 1-2 minutes to confirm that the salt concentration and pH are stable and within the target range. The solution preparation is complete. The valve on the salt outlet pipe is opened, and the prepared solution is discharged and collected for subsequent experiments. Attached Figure Description

[0013] This manual includes the following figures, which illustrate the following:

[0014] Figure 1 This is an overall structural diagram of a neutral salt spray test solution preparation device according to this utility model.

[0015] The diagram is labeled as follows: 1. Brine tank; 2. Pure water preparation structure; 201. PP cotton filter element; 202. Granular activated carbon filter element; 203. Reverse osmosis membrane; 204. Purification column; 205. Tap water inlet; 206. Booster pump; 3. Titration structure; 301. Fixing plate; 302. Dilute hydrochloric acid storage tank; 303. Sodium hydroxide solution storage tank; 304. Sodium chloride inlet pipe; 305. First jog titration valve; 306. Second jog titration valve; 4. Detection device; 401. Water level sensor; 402. Salt concentration sensor; 403. pH sensor; 5. Stirring motor; 501. Fan; 6. Brine outlet pipe; 7. Wastewater outlet; 8. Pure water outlet pipe. Detailed Implementation

[0016] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0017] like Figure 1 As shown, a neutral salt spray test solution preparation device includes a salt water tank 1 and a pure water preparation structure 2. The outlet of the pure water preparation structure 2 is connected to the salt water tank 1. A titration structure 3 is installed at the opening of the salt water tank 1, and a detection device 4 is installed inside the salt water tank 1. The salt water tank 1 serves as the preparation container for the salt spray test solution, providing space for the mixing and reaction of pure water and reagents, ultimately yielding a sodium chloride solution with a concentration and pH that meet the standards. The pure water preparation structure 2 performs multi-stage deep filtration of tap water to remove impurities, ions, and organic matter, preparing laboratory-grade pure water to avoid interference from impurities in the salt spray test results. The titration structure 3 adds reagents—sodium chloride, dilute hydrochloric acid, and sodium hydroxide solution—to the salt water tank 1, thereby controlling the salt concentration and pH value of the solution. The detection device 4 monitors the water level, salt concentration, and pH value of the solution in the salt water tank 1 to ensure that the solution meets the standards.

[0018] The titration structure 3 includes a fixing plate 301, which is positioned above the brine tank 1 and connected to the wall. A dilute hydrochloric acid storage tank 302, a sodium hydroxide solution storage tank 303, and a sodium chloride inlet pipe 304 are connected to the fixing plate 301. A first jog titration valve 305 is installed at the outlet of the dilute hydrochloric acid storage tank 302, and a second jog titration valve 306 is installed at the outlet of the sodium hydroxide solution storage tank 303. The fixing plate 301, connected to the wall, serves as a supporting carrier for the titration structure 3, stably fixing the dilute hydrochloric acid storage tank 302, the sodium hydroxide solution storage tank 303, and the sodium chloride inlet pipe 304 above the brine tank 1. The dilute hydrochloric acid storage tank 302 stores dilute hydrochloric acid solution to lower the pH of the solution, providing an acidic adjustment reagent for brine with excessively high pH. A first jog titration valve 305 is located at the outlet of the dilute hydrochloric acid storage tank 302. When the pH needs to be lowered, the first jog titration valve 305 is activated to release dilute hydrochloric acid as small droplets into the brine tank 1. The sodium hydroxide solution storage tank 303 stores sodium hydroxide solution to raise the pH of the solution, providing an alkaline adjustment reagent for brine with excessively low pH. A second jog titration valve 306 is located in the sodium hydroxide solution storage tank 303. When the pH needs to be raised, the second jog titration valve 306 is activated to release sodium hydroxide solution as small droplets into the brine tank 1 until the pH reaches the target value. The sodium chloride inlet pipe 304 is the sodium chloride addition channel, through which sodium chloride is manually added. Sodium chloride is added to the solution in the brine tank 1 to adjust the salt concentration to the standard value required for the salt spray test.

[0019] The pure water preparation structure 2 includes a PP cotton filter element 201, a granular activated carbon filter element 202, a reverse osmosis membrane 203, a purification column 204, and a booster pump 206. The inlet of the PP cotton filter element 201 is connected to the tap water inlet 205, the outlet of the PP cotton filter element 201 is connected to the inlet of the granular activated carbon filter element 202, the outlet of the granular activated carbon filter element 202 is connected to the inlet of the booster pump 206, the outlet of the booster pump 206 is connected to the inlet of the reverse osmosis membrane 203, the outlet of the reverse osmosis membrane 203 is connected to the inlet of the purification column 204, and the outlet of the purification column 204 is connected to the inlet of the brine tank 1. PP cotton filter cartridge 201 filters large particulate impurities in tap water while preventing these impurities from scratching subsequent fine filter cartridges. The coarsely filtered water is then transported to granular activated carbon filter cartridge 202, which further treats the pure water, adsorbing residual chlorine in the tap water, as well as some organic matter, odors, and pigments, improving water quality. It also further filters out tiny suspended solids, providing cleaner water for subsequent reverse osmosis membrane 203 and reducing the risk of contamination to the reverse osmosis membrane 203. The booster pump 206 increases the inlet water pressure, allowing water to pass through the reverse osmosis membrane 203. The reverse osmosis membrane 203 removes dissolved salts, heavy metal ions, bacteria, viruses, and macromolecular organic matter from the water, achieving efficient separation of water and impurities. The water filtered by the reverse osmosis membrane 203 enters the purification column 204 to further remove residual ions and trace organic matter from the primary pure water, raising the water quality to laboratory-grade pure water standards. The water treated by the purification column 204 is then transported through a pipeline to the brine tank 1 for preparing the salt spray test solution. A valve is installed on the pipeline to stop water injection when the required water volume is reached.

[0020] The detection device 4 includes a water level sensor 401, which is installed inside the brine tank 1. The brine tank 1 also contains a salt concentration sensor 402 and a pH sensor 403. The water level sensor 401, salt concentration sensor 402, and pH sensor 403 are connected to an external display panel via wires to display numerical values. The water level sensor 401 monitors the amount of pure water injected into the brine tank 1 to ensure the accuracy of the basic volume of the prepared solution. The salt concentration sensor 402 monitors the sodium chloride concentration in the solution within the brine tank 1 in real time to determine whether sodium chloride needs to be added, avoiding excessively high or low concentrations that could affect the salt spray test results. The pH sensor 403 monitors the acidity or alkalinity of the solution within the brine tank 1 in real time to determine whether dilute hydrochloric acid or sodium hydroxide solution needs to be added, ensuring that the solution's acidity or alkalinity meets the test standards.

[0021] A stirring motor 5 is installed on one side of the brine tank 1. The output shaft of the stirring motor 5 is located inside the brine tank 1 and is connected to a fan 501. When the stirring motor 5 drives the fan 501 to rotate, it stirs up the settled sodium chloride particles and accelerates their dissolution. At the same time, it quickly disperses any locally accumulated acid or alkaline solutions throughout the water body, ultimately achieving uniform solution concentration and pH value throughout the tank and avoiding preparation errors caused by localized unevenness. The output shaft of the stirring motor 5 is connected to the brine tank 1 via a bushing. The inner side of the bushing uses a fluororubber skeleton oil seal, and the bushing is sealed to the brine tank 1 using a fluororubber O-ring.

[0022] The brine tank 1 is connected to a brine outlet pipe 6. A valve is installed on the brine outlet pipe 6. Opening the valve allows the prepared solution to be discharged through the brine outlet pipe 6 and collected for subsequent experiments.

[0023] The brine tank 1 is equipped with a wastewater discharge port 7 at the bottom. When cleaning the brine tank 1, the wastewater can be discharged by opening the sealed cover of the wastewater discharge port 7.

[0024] The outlet of the purification column 204 is connected to a pure water outlet pipe 8. The pure water outlet pipe 8 draws out the laboratory-grade pure water prepared by the purification column 204. In addition to being used for the preparation of saline solution, the pure water can be discharged and stored through the pure water outlet pipe 8.

[0025] The role and effect of the embodiments

[0026] Open the tap water inlet valve 205, and tap water flows sequentially into the PP cotton filter 201 and the granular activated carbon filter 202. The PP cotton filter 201 filters out large particles of impurities such as silt and rust, preventing damage to subsequent filter elements. The granular activated carbon filter 202 adsorbs residual chlorine, organic matter, and odors, further filtering out tiny suspended solids. The pretreated water flows into the booster pump 206, which increases the water pressure. The high-pressure water enters the reverse osmosis membrane 203. The reverse osmosis membrane 203 traps dissolved salts, heavy metals, bacteria, and large organic molecules, allowing only water molecules to pass through. The water then flows into the purification column 204, where the ion exchange resin removes residual ions and trace organic matter, raising the water quality to laboratory-grade pure water. Open the valve from the outlet of the purification column 204 to the brine tank 1, and pure water is injected into the brine tank 1. The water level sensor 401 monitors the liquid level in real time. When the water level reaches the preset preparation volume, close the valve to stop water injection. The operator manually adds sodium chloride to the brine tank 1 through the sodium chloride inlet pipe 304. Then, the stirring motor 5 is started, and the motor output shaft drives the fan 501 to stir up the settled sodium chloride particles, accelerating their dissolution. Next, the first jog titration valve 305 is activated to release dilute hydrochloric acid as small droplets into the brine tank 1; the second jog titration valve 306 is activated to release sodium hydroxide solution as small droplets into the brine tank 1. The pH sensor 403 monitors the solution's acidity and alkalinity in real time, adding dilute hydrochloric acid and sodium hydroxide solution to the brine tank 1 until the pH value reaches the target. After adjustment, the stirring motor 5 is turned off, and the solution is allowed to stand for 1-2 minutes to confirm that the salt concentration and pH value are stable and within the target range. The solution preparation is complete. The valve on the salt outlet pipe 6 is opened, and the prepared solution is discharged and collected through the salt outlet pipe 6 for subsequent experiments.

[0027] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A neutral salt spray test solution preparation device, comprising a saline tank (1), characterized in that, It includes a pure water preparation structure (2), which is connected to a brine tank (1). A titration structure (3) is provided at the opening of the brine tank (1), and a detection device (4) is provided inside the brine tank (1).

2. The neutral salt spray test solution preparation device according to claim 1, characterized in that: The titration structure (3) includes a fixing plate (301), which is set above the brine tank (1) and connected to the wall. A dilute hydrochloric acid storage tank (302), a sodium hydroxide solution storage tank (303), and a sodium chloride inlet pipe (304) are connected to the fixing plate (301). A first point-operated titration valve (305) is provided at the outlet of the dilute hydrochloric acid storage tank (302), and a second point-operated titration valve (306) is provided at the outlet of the sodium hydroxide solution storage tank (303).

3. The neutral salt spray test solution preparation device according to claim 1, characterized in that: The pure water preparation structure (2) includes a PP cotton filter element (201), a granular activated carbon filter element (202), a reverse osmosis membrane (203), a purification column (204), and a booster pump (206). The inlet of the outer shell of the PP cotton filter element (201) is connected to the tap water inlet (205). The outlet of the outer shell of the PP cotton filter element (201) is connected to the inlet of the outer shell of the granular activated carbon filter element (202). The outlet of the outer shell of the granular activated carbon filter element (202) is connected to the inlet of the booster pump (206). The outlet of the booster pump (206) is connected to the inlet of the outer shell of the reverse osmosis membrane (203). The outlet of the outer shell of the reverse osmosis membrane (203) is connected to the inlet of the purification column (204). The outlet of the purification column (204) is connected to the inlet of the brine tank (1).

4. The neutral salt spray test solution preparation device according to claim 1, characterized in that: The detection device (4) includes a water level sensor (401), which is installed inside the brine tank (1). The brine tank (1) is equipped with a salt concentration sensor (402) and a pH sensor (403).

5. The neutral salt spray test solution preparation apparatus according to any one of claims 1 to 4, characterized in that: A stirring motor (5) is provided on one side of the brine tank (1). The output shaft of the stirring motor (5) is located inside the brine tank (1), and the output shaft is connected to a fan (501).

6. The neutral salt spray test solution preparation device according to claim 1, characterized in that: The brine tank (1) is connected to a brine outlet pipe (6).

7. The neutral salt spray test solution preparation device according to claim 1, characterized in that: The bottom of the brine tank (1) is provided with a wastewater discharge port (7).

8. The neutral salt spray test solution preparation device according to claim 3, characterized in that: The outlet of the purification column (204) is connected to a pure water outlet pipe (8).

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