Snow melting salt corrosion test device and test method

Abstract

The invention discloses a snow melting salt corrosion test device and a test method, the snow melting salt corrosion test device comprises a test box, a spherical temperature and humidity test chamber with adjustable temperature and humidity is arranged in the test box, the spherical temperature and humidity test chamber is composed of a lower hemisphere chamber and an upper hemisphere chamber which can be separated, and a sample placing rack is arranged in the lower hemisphere chamber; a rotary spraying mechanism is arranged above the sample placing frame, the rotary spraying mechanism comprises a semi-arc-shaped support capable of rotating and nozzles uniformly arranged on the semi-arc-shaped support, the sample placing frame is installed on a lifting support capable of ascending and descending, and the lifting support is constructed to be a weighing support with a gravity sensing function. And the lower hemisphere chamber is configured to be a soaking water tank connected with a water supply system. According to the invention, the corrosion process of the snow-melting salt test sample in an icing-melting circulation state can be simulated.

Description

Technical Field

[0001] The invention belongs to the field of metal material corrosion, and in particular relates to a deicing salt corrosion test device and a test method. Background Art

[0002] Auto parts such as chassis parts, especially the power system of electric vehicles, are very susceptible to dirt deposition, gravel impact and salt water splash. The corrosion conditions are severe and can easily cause circuit short circuits and even lead to serious consequences. In order to improve the corrosion resistance of products, the industry currently uses salt spray tests, cyclic corrosion tests and road intensive corrosion tests to test the corrosion resistance of products. For corrosion resistance testing of parts and materials, neutral salt spray and cyclic corrosion tests are often used for assessment.

[0003] 1. Neutral salt spray test, through 5% sodium chloride solution, at 35℃ constant conditions, to verify the corrosion resistance of the comparison sample. This method uses a salt spray test chamber to pass the sodium chloride solution through the Cl - The corrosion conditions for metal materials are relatively simple, simulating the "wet atmospheric corrosion" of the natural environment, and the corrosion effect has a poor correlation with the natural exposure corrosion results. Due to the simple equipment and easy operation, it is currently widely used in laboratories to test the corrosion resistance of products or compare similar anti-corrosion processes.

[0004] 2. Cyclic corrosion test (compound salt spray corrosion), the conventional practice is to conduct a test by spraying 5% sodium chloride solution, combining high temperature and high humidity, high humidity and drying, etc., to verify the corrosion resistance of the comparison sample. This method uses a cyclic corrosion test chamber, through a combination of salt spray, high temperature and high humidity, drying and other modes, to simulate the "dry, damp and wet three-stage atmospheric corrosion" of the natural environment, which has a good correlation with natural exposure corrosion and is currently a widely used method in the field of automotive corrosion.

[0005] However, the factors affecting corrosion under natural environmental conditions are diverse and complex, and the above existing methods cannot reflect the corrosion conditions under the freeze-thaw cycle environment of snow-melting salt cover. Summary of the invention

[0006] One of the purposes of the present invention is to provide a deicing salt corrosion test device, which can simulate the corrosion process of deicing salt test samples in the ice-melting cycle state, so that the test is more sufficient and the test results are more authentic, accurate and referenceable.

[0007] The technical solution of the present invention is as follows:

[0008] A deicing salt corrosion test device comprises a test box, wherein a spherical temperature and humidity test chamber with adjustable temperature and humidity is arranged in the test box, the spherical temperature and humidity test chamber consists of a separable lower hemisphere chamber and an upper hemisphere chamber, a sample placement rack is arranged in the lower hemisphere chamber, a rotary spray mechanism is arranged above the sample placement rack, the rotary spray mechanism comprises a rotatable semicircular arc bracket and nozzles uniformly arranged on the semicircular arc bracket, the sample placement rack is installed on a liftable lifting bracket, the lifting bracket is constructed as a weighing bracket with gravity sensing, and the lower hemisphere chamber is constructed as an immersion water tank connected to a water supply system.

[0009] The test box of the present invention can simulate the corrosion intensity of the snow-melting salt environment, realize the ice-melting corrosion cycle of the test sample, and the sample placement rack can be raised and lowered, and the test sample can be subjected to auxiliary immersion test in conjunction with the immersion water tank, thereby realizing the conversion of the test sample to multiple test modes of spraying-immersion, thereby improving the application scope of the test box and simulating the corrosion effects in various real environments.

[0010] The present invention also has the following preferred design:

[0011] The sample placement rack and the lifting bracket of the present invention form a universal connection through a ball joint, which is convenient for adjusting the angle of the test sample and achieving a good spraying effect.

[0012] The upper hemisphere chamber of the present invention is provided with a sample monitoring device facing the sample placement rack so as to monitor the corrosion test process of the test sample.

[0013] As a feasible and preferred implementation, the semicircular arc bracket is rotatably connected to the lower hemispherical chamber via a driven rotating shaft. During the test, the semicircular arc bracket rotates, allowing the nozzle to spray the test sample at various angles.

[0014] The sample placement rack of the present invention is constructed as a multifunctional placement rack with a card slot and / or a clamp, and is used to fix various test samples.

[0015] The test box of the present invention has an observation window facing the sample placement rack, which is convenient for directly observing the test process in the test box from the outside.

[0016] The test box of the present invention is provided with a display component for displaying test box data, which is used to display and control test data such as temperature and humidity control parameters and rotary spray parameters of the rotary spray mechanism.

[0017] A drainage component is arranged at the bottom center of the lower hemispherical chamber of the present invention, and the funnel-shaped drainage component can improve the drainage efficiency.

[0018] A second object of the present invention is to provide a test method using the above-mentioned deicing salt corrosion test device, comprising the steps of:

[0019] S1. Degrease, clean, dry and weigh the test sample;

[0020] S2. Prepare snow-melting salt solution;

[0021] S3. Place the test sample on the sample rack;

[0022] S4. Start the test chamber, pre-treat the prepared snow-melting salt solution to 0°C to 4°C, adjust the temperature in the spherical temperature and humidity test chamber to -10°C to -2°C, and the wind speed is 2m / s to 10m / s. The snow-melting salt solution is sprayed around the test sample through a nozzle. The snow-melting salt solution will sink on the surface of the test sample in the form of raindrops to form an ice layer;

[0023] S5. The weight of the ice is obtained by the gravity sensor of the lifting bracket, and then the thickness of the ice is known. When the ice weight required for the test is reached, the temperature in the annular temperature and humidity test chamber is adjusted to start melting the ice layer, and the test sample is sprayed with clean water to remove the residual salt on the surface;

[0024] S6. Repeat steps S4 and S5 to perform ice coating-thawing cycles on the sample surface until the test is completed.

[0025] The deicing salt solution of the present invention includes reagent solutions of sodium chloride, calcium chloride and sodium bicarbonate. The three reagent solutions cannot be mixed and dissolved in water together. Each reagent solution is dissolved in water separately and then mixed to form a deicing salt solution. It is avoided that the three reagent solutions are mixed together to produce precipitates, which block the brine pipeline during the test process.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The test box of the present invention can simulate the corrosion intensity of the snow-melting salt environment, realize the ice-melting corrosion cycle of the test sample, and the sample placement rack can be raised and lowered, and the spray angle can be adjusted, accurately simulating the corrosion process of the test sample under various ice conditions. The test sample can be subjected to auxiliary immersion test in conjunction with the immersion water tank, realizing the conversion of the test sample to spray-immersion test methods. The test box of the present invention can combine the inherent test characteristics of the temperature and humidity test room to realize the cyclic corrosion combination test functions such as salt water spraying, high temperature and high humidity, drying, immersion, and low temperature ice, thereby improving the scope of application of the test box and simulating the corrosion effects under various real environments.

[0028] 2. The test method of the present invention is to pre-treat the test sample with the deicing salt solution to 0°C to 4°C and then spray it on the test sample, which can reduce the surface temperature of the test sample to about 0°C. Through the test parameters set by the present invention, the solution can simulate the precipitation of raindrops on the surface of the test sample, forming an ice layer in a low temperature environment, simulating the real deicing salt corrosion test process, and the test results are more authentic, accurate and referenceable. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is an appearance diagram of a deicing salt corrosion test device provided by the present invention.

[0030] Figure 2 An exploded view of a deicing salt corrosion test device provided by the present invention;

[0031] Figure 3 A structural principle diagram of a deicing salt corrosion test device provided by the present invention;

[0032] Figure 4 A three-dimensional diagram of a sample placement rack of the present invention;

[0033] Figure 5 for Figure 4 A side view of a sample holder;

[0034] Figure 6 The present invention is a structural diagram of a nozzle.

[0035] Description of reference numerals:

[0036] 1-test chamber; 2-observation window; 3-spherical temperature and humidity test chamber; 3a-lower hemisphere chamber; 3b-upper hemisphere chamber; 4-sample placement rack; 4a-ball joint; 5-semicircular bracket; 5a-rotation axis; 6-nozzle; 7-lifting bracket; 8-monitoring device; 9-immersion tank; 10-water supply system; 11-display component. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present invention more obvious, the exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described herein. Based on the embodiments of the present invention described in the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the protection scope of the present invention.

[0038] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0039] It should be understood that the present invention can be implemented in different forms and should not be interpreted as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to make the disclosure thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0040] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0041] In order to fully understand the present invention, a detailed structure will be proposed in the following description to illustrate the technical solution proposed by the present invention. The optional embodiments of the present invention are described in detail as follows, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0042] A deicing salt corrosion test device, such as Figures 1 to 6 As shown, it includes a test box 1, in which a spherical temperature and humidity test chamber 3 with adjustable temperature and humidity is arranged, the spherical temperature and humidity test chamber 3 is composed of a separable lower hemispherical chamber 3a and an upper hemispherical chamber 3b, a sample placement rack 4 is arranged in the lower hemispherical chamber 3a, a rotary spray mechanism is arranged above the sample placement rack 4, the rotary spray mechanism includes a rotatable semicircular arc bracket 5 and nozzles 6 evenly arranged on the semicircular arc bracket 5, the sample placement rack 4 is installed on a liftable lifting bracket 7, the lifting bracket 7 is constructed as a weighing bracket with gravity sensing, and the lower hemispherical chamber 3a is constructed as an immersion water tank 9 connected to the water supply system 10.

[0043] In one embodiment, the sample placement rack 4 and the lifting bracket 7 form a universal connection through a ball joint 4a, which is convenient for adjusting the angle of the test sample to achieve a good spraying effect.

[0044] In one embodiment, a sample monitoring device 8 facing the sample placement rack 4 is installed inside the upper hemispherical chamber 3b to monitor the corrosion test process of the test sample.

[0045] In one embodiment, the semicircular arc bracket 5 is rotatably connected to the lower hemispherical chamber 3a via a drivable rotating shaft 5a. During the test, the semicircular arc bracket 5 rotates to allow the nozzle 6 to spray the test sample at various angles. The nozzle 6 can be configured as follows: Figure 6 The spherical structure shown has multiple water spray holes evenly distributed.

[0046] In one embodiment, the sample placement rack 4 is constructed as a multifunctional placement rack with a slot and / or a clamp for fixing various test samples.

[0047] In one embodiment, the test box 1 has an observation window 2 facing the sample placement rack 4, so as to facilitate direct observation of the test process in the test box 1 from the outside.

[0048] In one embodiment, the test box 1 is provided with a display component 11 for displaying data of the test box 1, and is used to display and control test data such as temperature and humidity control parameters and rotary spray parameters of the rotary spray mechanism.

[0049] In one embodiment, a drainage component is arranged at the bottom center of the lower hemispherical chamber 3a. The funnel-shaped drainage component can speed up the drainage efficiency. The drainage component is not shown in the figure and can be made of a drainage pipe with a valve in the prior art.

[0050] The test method using the above-mentioned deicing salt corrosion test device includes the following steps:

[0051] S1. Degrease, clean, dry and weigh the test sample. This step is generally for metal test samples;

[0052] S2. Prepare snow-melting salt solution;

[0053] S3. Place the test sample on the sample rack 4;

[0054] S4. Start the test box 1, pre-treat the prepared snow-melting salt solution to 0°C to 4°C, adjust the temperature in the spherical temperature and humidity test chamber 3 to -10°C to -2°C, and the wind speed is 2m / s to 10m / s. The snow-melting salt solution is sprayed around the test sample through the nozzle 6. The snow-melting salt solution will sink on the surface of the test sample in the form of raindrops to form an ice layer. During the spraying process, the rotation angle and rotation speed of the semicircular arc bracket 5 can be set according to the test requirements, such as spraying around the test sample at 90° to 270°, or spraying at a fixed angle;

[0055] S5. The weight of the ice is obtained by the gravity sensor of the lifting bracket 7, and then the thickness of the ice is known. When the weight of the ice required for the test is reached, the temperature in the annular temperature and humidity test chamber 3 is adjusted to start melting the ice layer, and the test sample is sprayed with clean water to remove the residual salt on the surface;

[0056] S6. Repeat steps S4 and S5 to perform ice coating-thawing cycles on the sample surface until the test is completed.

[0057] The above test process can be adaptively adjusted according to experimental requirements. In one embodiment, the deicing salt solution includes reagent solutions of sodium chloride, calcium chloride and sodium bicarbonate. The three reagent solutions cannot be mixed and dissolved in water together. Each reagent solution is dissolved in water separately and then mixed to form a deicing salt solution, wherein the main components of the deicing salt solution are 0.9% sodium chloride, 0.1% calcium chloride and 0.075% sodium bicarbonate.

[0058] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A deicing salt corrosion test device, comprising a test box, characterized in that: The test box is provided with a spherical temperature and humidity test chamber with adjustable temperature and humidity, the spherical temperature and humidity test chamber is composed of a separable lower hemisphere chamber and an upper hemisphere chamber, the lower hemisphere chamber is provided with a sample placement rack, a rotary spray mechanism is provided above the sample placement rack, the rotary spray mechanism comprises a rotatable semicircular arc bracket and nozzles uniformly arranged on the semicircular arc bracket, the sample placement rack is installed on a liftable lifting bracket, the lifting bracket is constructed as a weighing bracket with gravity sensing, and the lower hemisphere chamber is constructed as an immersion water tank connected to a water supply system.

2. The deicing salt corrosion test device according to claim 1, characterized in that: The sample placement rack and the lifting bracket are universally connected via a ball joint.

3. The deicing salt corrosion test device according to claim 1, characterized in that: A sample monitoring device facing the sample placement rack is installed inside the upper hemisphere chamber.

4. The deicing salt corrosion test device according to claim 1, characterized in that: The semicircular arc bracket is rotatably connected to the lower hemispherical chamber via a drivable rotating shaft.

5. The deicing salt corrosion test device according to claim 1, characterized in that: The sample placement rack is configured as a multifunctional placement rack having a card slot and / or a clamp.

6. The deicing salt corrosion test device according to claim 1, characterized in that: The test box has an observation window facing the sample placement rack.

7. The deicing salt corrosion test device according to claim 1, characterized in that: The test box is provided with a display component for displaying test box data.

8. The deicing salt corrosion test device according to claim 1, characterized in that: A drainage component is arranged at the bottom center of the lower hemispherical chamber.

9. A test method using the deicing salt corrosion test device according to any one of claims 1 to 8, characterized in that: Includes steps: S1. Degrease, clean, dry and weigh the test sample; S2. Prepare snow-melting salt solution; S3. Place the test sample on the sample rack; S4. Start the test chamber, pre-treat the prepared snow-melting salt solution to 0°C to 4°C, adjust the temperature in the spherical temperature and humidity test chamber to -10°C to -2°C, and the wind speed is 2m / s to 10m / s. The snow-melting salt solution is sprayed around the test sample through a nozzle. The snow-melting salt solution will sink on the surface of the test sample in the form of raindrops to form an ice layer; S5. The weight of the ice is obtained by the gravity sensor of the lifting bracket, and then the thickness of the ice is known. When the ice weight required for the test is reached, the temperature in the annular temperature and humidity test chamber is adjusted to start melting the ice layer, and the test sample is sprayed with clean water to remove the residual salt on the surface; S6. Repeat steps S4 and S5 to perform ice coating-thawing cycles on the sample surface until the test is completed.

10. The test method of the deicing salt corrosion test device according to claim 9, characterized in that: The deicing salt solution includes reagent solutions of sodium chloride, calcium chloride and sodium bicarbonate. The three reagent solutions cannot be mixed and dissolved in water together. Each reagent solution needs to be dissolved in water separately and then mixed to form the deicing salt solution.

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