A kind of fibreglass corrosion resistance testing device and testing method

Abstract

This invention discloses a testing device for the corrosion resistance of fiberglass, comprising a temperature control component and a testing component. The temperature control component includes a chamber with a cover hinged to the open end. The chamber contains a temperature-controlled liquid and can achieve constant temperature regulation. The testing component includes a test barrel, a sealing cap, and a placement frame. The sealing cap fits onto the open end of the test barrel, which is placed inside the chamber and can be immersed in the temperature-controlled liquid. The test barrel contains a corrosion test solution. The placement frame is detachably installed inside the test barrel and supports the sample to be tested, ensuring that the sample is completely immersed in the test solution. By changing the shape of the fiberglass test and then precisely cutting the sample to strictly control the sample surface area, the core problem of inconsistent sample surface area in traditional testing methods is completely solved. This eliminates the interference of surface area differences on test data from the source, significantly reduces the dispersion of test data, and improves the accuracy of testing.

Description

Technical Field

[0001] This invention relates to the field of glass fiber performance testing technology, specifically to a testing device and method for testing the corrosion resistance of fiberglass. Background Technology

[0002] Glass fiber is a cost-effective inorganic non-metallic composite material with excellent mechanical strength, insulation, and heat resistance. It is widely used in chemical corrosion protection equipment, building composite materials, rail transportation, wind power equipment, and other fields. The acid, alkali, and humid corrosive environments vary greatly in different application scenarios; therefore, the corrosion resistance of glass fiber materials directly determines the service life, stability, and safety of the end product, making it an indispensable core quality control indicator in the glass fiber production process.

[0003] Currently, the corrosion resistance testing of glass fibers mostly employs traditional immersion testing methods. However, these methods have significant drawbacks: they cannot guarantee a uniform surface area of ​​the test samples, leading to inconsistent contact areas between the corrosive medium and the sample during the test. This results in large data dispersion, poor detection accuracy, and an inability to accurately reflect the actual corrosion resistance of glass fibers. Furthermore, traditional testing methods lack standardized procedures in sample preparation, corrosion environment control, and data calculation, further impacting the repeatability and reproducibility of test data and failing to meet the glass fiber industry's demand for precise product quality control. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a testing device and method for testing the corrosion resistance of fiberglass, thereby solving the technical problems in existing glass fiber corrosion resistance testing, such as large data dispersion, poor accuracy, and poor repeatability and reproducibility due to inconsistent sample surface areas.

[0005] To achieve the above objectives, the first aspect of the present invention adopts the following technical solution: a fiberglass corrosion resistance testing device, comprising a constant temperature component and a detection component;

[0006] The thermostatic component includes a chamber, with a cover hinged to the open end of the chamber. The chamber contains a thermostatic liquid and can achieve constant temperature control.

[0007] The testing components include a test barrel, a sealing cap, and a placement frame. The sealing cap fits onto the open end of the test barrel, which is placed inside the housing and can be immersed in a constant-temperature liquid. The inside of the test barrel is used to hold the corrosion test solution. The placement frame is detachably installed inside the test barrel and is used to support the sample to be tested and to completely immerse the sample in the test solution.

[0008] On the other hand, according to embodiments of the present invention, the present invention also provides a testing method for a fiberglass corrosion resistance testing device, comprising the following steps:

[0009] S1. Sample preparation and molding: Molten glass is introduced into a high-temperature resistant mold through a guide structure and cast into shape. After cooling, it is demolded to obtain a complete and defect-free original fiberglass sample.

[0010] S2. Sample finishing: The original sample after demolding is cut to length, polished and ground according to the test standard to ensure that the sample size accuracy and surface roughness meet the corrosion resistance test benchmark requirements;

[0011] S3. Sample cleaning pretreatment: The finished sample is cleaned and cleaned in sequence with pure water and organic solvents that meet national standards to remove surface dust, oil and processing residues.

[0012] S4. Initial constant weight test of sample: After cleaning, the sample is dried to constant weight under a set constant temperature condition. After cooling, the sample is weighed using a high-precision weighing device and the initial mass of the sample is recorded.

[0013] S5. Corrosive medium and water bath system setup: Prepare corrosive test solution, place the test tank in the chamber 10, set up the placement frame and inject the corrosive solution, and at the same time complete the debugging and setting of chamber temperature, water level and preheating parameters.

[0014] S6. Constant temperature corrosion immersion test: After the water tank temperature stabilizes to the set constant temperature range, place multiple sets of test samples on the placement frame, so that the samples are isolated from each other and completely immersed in the corrosion solution. After sealing, carry out long-term constant temperature immersion corrosion.

[0015] S7. Sample post-processing and secondary constant weight test: After the corrosion immersion is completed, the sample is taken out, washed and neutralized with pure water and organic solvent in turn, and dried at constant temperature again until constant weight. After cooling, the final mass of the sample after corrosion is weighed and recorded.

[0016] S8. Test data calculation and result judgment: Based on the mass difference of the sample before and after corrosion and the standard surface area of ​​the sample, calculate the corrosion rate of mass loss per unit surface area according to the national standard; determine the validity of the test by the deviation value of the test data of multiple sets of parallel samples, and re-prepare the sample and retest if the data deviation exceeds the limit.

[0017] Preferably, in step S1, a glass melt guide with an inverted V-shaped flow guiding structure is used below the fiber drawing screen of the fiberglass production line to smoothly guide the high-temperature molten glass into the high-temperature resistant mold. After naturally cooling to room temperature, the glass is demolded to obtain a fiberglass sample without cracks, defects, and a smooth surface.

[0018] Preferably, in step S2, the sample is precisely cut to size after the cutting line is marked by a cutting machine to prepare a cuboid sample with a fixed standard surface area, and the overall cutting error is controlled to be ≤0.05mm; after cutting, the sample is finely ground and mirror polished by a grinding and polishing machine to control the surface roughness Ra≤0.8μm.

[0019] Preferably, in step S3, the polished sample is first cleaned multiple times with pure water, then immersed in anhydrous ethanol at room temperature for 8-12 minutes, and finally cleaned multiple times with secondary pure water to complete the surface cleaning pretreatment.

[0020] Preferably, in step S4, the sample drying temperature is set to 105℃±2℃, and the constant weight determination criterion is that the difference between the two consecutive weight measurements is ≤0.002g. An analytical balance with an accuracy of 0.1mg is used to weigh the sample.

[0021] Preferably, in step S5, an analytical grade reagent is used in combination with secondary purified water to prepare a 0.5 mol / L sulfuric acid solution as the corrosive medium, with a total preparation volume of 2-4 L; after injecting the corrosive solution into the test tank, a safety liquid level space is reserved, and the water bath liquid level is higher than the corrosive liquid level in the test tank; the chamber is set to a preheating temperature of 90℃ and a preheating time of 1 hour.

[0022] Preferably, in step S6, the water bath temperature is maintained at 90℃±1℃, and corrosion-resistant special clamps are used to pick up and place the sample. The sample is placed on the placement frame in a separated state and in point contact with the placement frame. The constant temperature corrosion immersion time is set to 90~100h.

[0023] Preferably, in step S7, the sample after corrosion testing is first washed repeatedly with secondary pure water, then washed repeatedly with anhydrous ethanol for neutralization and purification, and then dried at a constant temperature of 105℃±2℃ to constant weight.

[0024] Preferably, in step S8, the standard surface area of ​​the fixed sample test is 90 cm², and the corrosion rate is calculated according to the formula; three sets of parallel sample tests are set up, and the relative standard deviation of corrosion rate RSD≤5% is used as the criterion for determining the validity of the test data. If the deviation exceeds the standard, the sample is re-prepared and retested.

[0025] Compared with existing technologies, this invention has the following advantages: by changing the shape of the glass fiber test and then strictly controlling the sample surface area through precise cutting steps, the core problem of inconsistent sample surface area in traditional testing methods is completely solved. This eliminates the interference of surface area differences on test data from the source, significantly reduces the dispersion of test data, and improves the accuracy of detection.

[0026] By establishing a standardized testing process, from sample drawing, cooling and demolding, grinding and polishing, to pretreatment cleaning, drying and weighing, corrosion testing, post-treatment and data calculation, each step has clearly defined process parameters and control standards to ensure the repeatability and reproducibility of the testing process. This effectively avoids the randomness of a single test and ensures that the test results can truly reflect the actual corrosion resistance of glass fiber. It provides reliable data support for the selection of glass fiber materials, product design and quality control, meeting the glass fiber industry's demand for precise control of product quality. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention.

[0028] Figure 2 This is a full sectional view of an embodiment of the present invention.

[0029] Figure 3 This is a flowchart illustrating the steps of an embodiment of the present invention.

[0030] Figure 4 This is an operation flowchart of an embodiment of the present invention.

[0031] The reference numerals in the accompanying drawings include:

[0032] 10. Box body; 11. Cover plate; 12. Pipe; 13. Sample body;

[0033] 20. Test container; 21. Sealing cap;

[0034] 30. Placement frame. Detailed Implementation

[0035] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] like Figures 1 to 4 As shown in the figure, an embodiment of the present invention proposes a testing device for the corrosion resistance of fiberglass, which includes a constant temperature component and a detection component;

[0037] The temperature control component includes a chamber 10, with a cover 11 hinged to the open end of the chamber 10. The chamber 10 contains a temperature-controlled liquid and can achieve constant temperature regulation. As the core control unit of the testing environment, the temperature control component integrates multiple functions beyond basic temperature control, including temperature regulation, water level threshold setting, working time timing, and automatic start / stop control. The operating parameters of the water bath can be customized through digital operation, achieving fully automated control of the testing environment. This automated design significantly reduces manual intervention, effectively avoiding errors that may occur during manual temperature adjustment, water level control, and time recording. It ensures that core operating parameters such as temperature, water level, and time remain consistent for each test, guaranteeing the stability, repeatability, and standardization of the corrosion resistance testing process from an environmental control perspective. Simultaneously, it reduces the workload of operators and adapts to the needs of long-term, multi-batch routine testing.

[0038] In this embodiment, a water bath is used as the constant temperature component to achieve basic constant temperature and various control functions. In other embodiments, a suitable constant temperature device can be selected according to actual testing needs and operating conditions to improve the adaptability and flexibility of the solution.

[0039] The testing assembly includes a test container 20, a sealing cap 21, and a placement frame 30. The sealing cap 21 fits snugly to the open end of the test container 20. The entire test container 20 is placed inside the housing 10 and can be immersed in a constant-temperature liquid. The interior of the test container 20 is used to hold the corrosion test solution. The test container 20 is made of transparent material, and its transparent cavity structure allows for real-time observation of the sample's corrosion state. This facilitates operators in tracking the sample's changes in the corrosive medium throughout the process, enabling timely detection of abnormal corrosion phenomena and providing intuitive evidence for the analysis of test data. The sealed design effectively reduces the evaporation of the corrosive solution and prevents external dust from escaping. Dust and impurities falling into the barrel contaminate the corrosive medium, while simultaneously locking in the corrosive atmosphere inside the barrel to prevent interference from changes in ambient airflow, temperature, and humidity, thus ensuring the independence and stability of the corrosion test conditions. The small vent holes added to the sealing cap 21 can flexibly balance the air pressure inside and outside the container, preventing excessive pressure buildup due to temperature changes or gases generated during the corrosion reaction. They also dissipate excess heat, preventing sudden pressure changes from damaging the device or affecting test accuracy. This design balances sealing and safety, making it suitable for long-term immersion tests with various acid and alkali corrosive media, thus improving the device's versatility. The placement frame 30 is detachably installed inside the test barrel 20. The placement frame 30 supports the sample body 13 to be tested, ensuring that the sample body 13 is completely immersed in the test solution. The placement frame 30 adopts a hollow structure design, which minimizes the contact area between the placement frame 30 and the sample body 13, preventing the placement frame 30 from obstructing the sample surface. This ensures that the sample is in full, unobstructed contact with the corrosive medium, fundamentally solving the problem of uneven local corrosion and distorted test data caused by obstruction in traditional placement structures. It makes the corrosion reaction more closely resemble the actual corrosion state of the sample during use, further improving the authenticity and accuracy of the test results. Simultaneously, the placement frame 30 is detachably installed inside the test container 20, facilitating sample handling, batch replacement, and subsequent cleaning and maintenance. It also adapts to the need for simultaneous testing of multiple parallel samples, improving testing efficiency.

[0040] like Figure 2 As shown, a test method for a fiberglass corrosion resistance testing device is also provided, comprising the following steps:

[0041] S1. Sample preparation and molding: Molten glass is introduced into a high-temperature resistant mold through a guide structure and cast into shape. After cooling, it is demolded to obtain a complete and defect-free original fiberglass sample.

[0042] S2. Sample finishing: The original sample after demolding is cut to length, polished and ground according to the test standard to ensure that the sample size accuracy and surface roughness meet the corrosion resistance test benchmark requirements;

[0043] S3. Sample cleaning pretreatment: The finished sample is cleaned and cleaned in sequence with pure water and organic solvents that meet national standards to remove surface dust, oil and processing residues.

[0044] S4. Initial constant weight test of sample: After cleaning, the sample is dried to constant weight under a set constant temperature condition. After cooling, the sample is weighed using a high-precision weighing device and the initial mass of the sample is recorded.

[0045] S5. Corrosive medium and water bath system setup: Prepare corrosive test solution, place test tank 20 in chamber 10, set up placement frame 30 and inject corrosive solution, and at the same time complete the debugging and setting of temperature, water level and preheating parameters of chamber 10.

[0046] S6. Constant temperature corrosion immersion test: After the temperature of the water tank 10 stabilizes to the set constant temperature range, place multiple sets of test samples on the placement frame 30, so that the samples are isolated from each other and completely immersed in the corrosion solution. After sealing, perform long-term constant temperature immersion corrosion.

[0047] S7. Sample post-processing and secondary constant weight test: After the corrosion immersion is completed, the sample is taken out, washed and neutralized with pure water and organic solvent in turn, and dried at constant temperature again until constant weight. After cooling, the final mass of the sample after corrosion is weighed and recorded.

[0048] S8. Test data calculation and result judgment: Based on the mass difference of the sample before and after corrosion and the standard surface area of ​​the sample, calculate the corrosion rate of mass loss per unit surface area according to the national standard; determine the validity of the test by the deviation value of the test data of multiple sets of parallel samples, and re-prepare the sample and retest if the data deviation exceeds the limit.

[0049] like Figure 1 and Figure 2 As shown, in step S1, a glass melt guide with an inverted V-shaped flow structure is used below the fiberglass production line's drawing screen to smoothly guide the high-temperature molten glass into the high-temperature mold. After natural cooling to room temperature, the sample is demolded to obtain a fiberglass sample without cracks, defects, or a smooth surface. By using an inverted V-shaped flow guide below the fiberglass production line's drawing screen, the impact of the high-temperature molten glass can be effectively buffered, avoiding problems such as glass splashing and uneven flow rate. This ensures that the molten glass is smoothly and evenly guided into the high-temperature mold, laying a good foundation for sample forming. At the same time, demolding after natural cooling to room temperature can effectively avoid internal stress caused by sudden temperature changes in the sample, reducing the occurrence of defects such as cracks and defects. Ultimately, a stable fiberglass sample without cracks, defects, or a smooth surface can be obtained, ensuring the consistency and integrity of the samples in subsequent corrosion resistance tests. This avoids interference from the sample's own defects on the test results from the source, providing a reliable guarantee for the accuracy of the test data.

[0050] like Figure 1 and Figure 2 As shown, in step S2, the sample is precisely cut to size using a cutting machine after marking the cutting lines, preparing a cuboid sample with a fixed standard surface area. The overall cutting error is controlled to ≤0.05mm. After cutting, the sample is finely ground and mirror-polished using a grinding and polishing machine, controlling the surface roughness Ra to ≤0.8μm. In the precise sample cutting process, the dimensions are strictly calibrated and precise cutting lines are marked according to the test standards. The sample is then fixed in an inner circle cutting machine for precise processing. This not only prepares cuboid samples with a uniform surface area of ​​90 square centimeters, but also controls the overall cutting error to ≤0.05mm. This completely solves the problem of large data dispersion and poor comparability caused by inconsistent sample surface areas in traditional tests, ensuring that all test samples have the same contact area with the corrosive medium, thus guaranteeing the consistency of test conditions from the source. In the sample grinding and polishing stage, the cut samples are fixed in a grinding and polishing machine for fine grinding and mirror polishing, which effectively removes burrs, edge defects and surface irregularities generated during the cutting process. At the same time, the overall surface roughness of the sample is strictly controlled to Ra≤0.8μm, avoiding the situation where corrosive media accumulate locally and the corrosion reaction is uneven due to sample surface defects. This ensures that the corrosion test process is uniform and stable, further improving the accuracy and reliability of the test data, and laying a good foundation for subsequent sample pretreatment and isothermal corrosion immersion test.

[0051] like Figure 1 and Figure 2 As shown, in step S3, the polished sample is first cleaned multiple times with purified water, then immersed in anhydrous ethanol at room temperature for 8-12 minutes, and finally cleaned multiple times with secondary purified water to complete the surface cleaning pretreatment. This step strictly uses GB / T6682 secondary purified water. The polished sample is first cleaned 10 times to initially remove easily detachable impurities such as dust and processing debris adhering to the surface. Then, the sample is immersed in anhydrous ethanol at room temperature for 10 minutes to thoroughly remove oil stains and other difficult-to-rinse impurities from the sample surface using the solubility of anhydrous ethanol, ensuring thorough removal of impurities. Finally, it is cleaned 5 times with secondary purified water to effectively rinse away residual anhydrous ethanol and dissolved impurities, ensuring a clean and residue-free sample surface. The entire pretreatment process is standardized and the parameters are clearly defined, completely avoiding interference from impurities on the sample surface on the corrosion reaction, preventing side reactions between impurities and the corrosive medium or affecting the contact between the corrosive medium and the sample surface, ensuring that subsequent corrosion tests can truly reflect the corrosion resistance of the fiberglass itself, and further improving the accuracy and reliability of the test data.

[0052] like Figure 1 and Figure 2As shown, in step S4, the sample drying temperature is set to 105℃±2℃. The constant weight criterion is a difference of ≤0.002g between two weighings. An analytical balance with an accuracy of 0.1mg is used for sample weighing. In the sample drying process, the cleaned sample is placed in a drying oven, and the drying temperature is strictly controlled at 105℃±2℃. The constant weight criterion is a difference of ≤0.002g between two weighings. This thoroughly removes residual moisture from the sample surface and interior, avoiding interference from moisture in the sample weight measurement and ensuring that the weighed sample weight accurately reflects its actual mass. After the sample cools naturally to room temperature, it is accurately weighed using an analytical balance with an accuracy of 0.1mg, and the initial weight M1 is recorded. This extremely high weighing accuracy effectively avoids weighing errors and ensures the accuracy of the initial weight data.

[0053] like Figure 1 and Figure 2 As shown, in step S5, analytical grade reagents and secondary purified water are used to prepare a 0.5 mol / L sulfuric acid solution as the corrosion medium, with a total volume of 2-4 L. After injecting the corrosion solution into the test tank 20, a safety margin is reserved, and the water bath level is higher than the corrosion liquid level in the test tank 20. The chamber 10 is set to a preheating temperature of 90℃ and a preheating time of 1 hour. In the corrosion medium preparation step, analytical grade sulfuric acid and GB / T6682 secondary purified water are used to accurately prepare 3 L of 0.5 mol / L sulfuric acid solution as the corrosion medium. Analytical grade reagents can avoid impurities interfering with the corrosion reaction, and secondary purified water ensures the purity of the solution. The fixed concentration and volume ensure the consistency of the corrosion test conditions, providing a unified standard for comparative testing of different samples. During chamber 10 debugging, the test barrel 20 is placed in the center of chamber 10 and a custom-designed hollowed-out placement frame 30 is installed to ensure proper sample placement. When injecting the corrosion solution, an 8cm safety margin is reserved to effectively prevent solution overflow after sample placement, ensuring test safety. Secondary purified water is added to chamber 10 until the liquid level is 2cm above the corrosion solution level to ensure uniform heating of the test barrel 20 and effective temperature control. By setting the 90℃ preheating temperature, 1-hour preheating time, and water level thresholds on the control panel and activating the automatic water replenishment function, the water bath environment can quickly reach and stably maintain the required test temperature, avoiding temperature fluctuations from affecting the corrosion reaction. At the same time, automatic water level control is achieved, reducing manual intervention and human error, laying a stable and safe foundation for subsequent long-term constant-temperature corrosion immersion tests, and further improving the reliability and repeatability of test data.

[0054] like Figure 1 and Figure 2As shown, in step S6, the water bath temperature is maintained stably at 90℃±1℃. A corrosion-resistant clamp is used to handle the sample, which is placed on the placement frame 30 in a separated state with point contact to the frame. The constant-temperature corrosion immersion time is set to 90–100 hours. Before testing, the chamber temperature is strictly maintained at 90℃±1℃ to avoid temperature fluctuations affecting the corrosion reaction rate and to ensure that all samples are in the same constant-temperature corrosion environment, guaranteeing the consistency and repeatability of the test conditions. Using corrosion-resistant clamps for sample handling effectively prevents damage to the clamps from the corrosive medium and contaminates the sample surface or corrosive solution, ensuring the cleanliness of the test. Three sets of pre-treated samples are stably placed on the placement frame 30, ensuring strict separation between samples, point contact between the sample and the support, and complete immersion of the sample in the corrosive solution. Separation prevents uneven corrosion caused by sample contact obstruction, while the point contact design minimizes support obstruction of the sample surface, ensuring comprehensive, no-dead-angle contact with the corrosive medium. Complete immersion ensures the corrosion reaction occurs fully, closely mimicking the actual corrosion conditions of the samples. The sealing cap 21 and water bath lid are tightly closed, and a 96-hour continuous corrosion period is set. This prevents the corrosive solution from evaporating and external impurities from entering, while ensuring the corrosion process continues in a stable, sealed environment, further improving the accuracy and reliability of the test data and truly reflecting the actual corrosion resistance of the fiberglass.

[0055] like Figure 1 and Figure 2 As shown, in step S7, the sample after the corrosion test is first repeatedly washed with secondary purified water, then repeatedly washed with anhydrous ethanol for neutralization and purification, and then dried at a constant temperature of 105℃±2℃ to constant weight. After the corrosion test, the sample is removed using corrosion-resistant clamps and first washed repeatedly with secondary purified water 10 times to thoroughly remove residual sulfuric acid corrosive media adhering to the sample surface, avoiding the residual media from affecting subsequent weight measurement and neutralization effect; then washed with anhydrous ethanol 5 times to complete neutralization and purification, further removing residual corrosive substances and preventing them from continuing to react with the sample, ensuring the sample's stability. Subsequently, the treated sample is placed in a drying oven and dried at a constant temperature of 105℃±2℃ to constant weight, which can thoroughly remove residual moisture on the sample surface and inside, avoiding moisture interference with the weight measurement results. After the sample cools to room temperature, the weight after corrosion M2 is recorded and accurately compared with the previously recorded initial weight M1, providing accurate data for the calculation of corrosion weight loss difference and corrosion rate, effectively avoiding errors in the post-processing stage, and further ensuring the accuracy and reliability of the entire corrosion resistance test results.

[0056] like Figure 1 and Figure 2As shown, in step S8, the standard surface area of ​​the sample is fixed at 90 cm², and the corrosion rate is calculated according to the formula. Three sets of parallel samples are tested, and the relative standard deviation (RSD) of the corrosion rate ≤ 5% is used as the criterion for valid and qualified test data. If the deviation exceeds the standard, the sample is re-prepared and retested. Through standardized calculation methods and strict qualification criteria, the accuracy, reliability, and validity of the entire corrosion resistance test data are ensured. This step fixes the standard surface area of ​​the sample at 90 cm², and strictly follows the specified formula: Mass loss per unit surface area = (Initial mass - Final mass) / Surface area of ​​the sample before corrosion. By calculating the difference in weight loss of a single set of samples due to corrosion (M1 - M2, i.e., the difference between the initial mass and the final mass), the corrosion rate of each set of samples is calculated, and the final conclusion is obtained. The standardized calculation method avoids human error in the calculation process and ensures the accuracy of the corrosion rate calculation results. Meanwhile, three sets of parallel samples were set up for testing. The relative standard deviation of corrosion rate (RSD) ≤ 5% was used as the criterion for valid and qualified test data. This effectively avoids the randomness of a single test and improves the repeatability and reproducibility of the test data. If the deviation exceeds the standard, the sample is re-prepared and retested. This can promptly eliminate invalid data and avoid the influence of random errors in sample preparation, testing operations, etc. on the final results. This further ensures the accuracy and reliability of the test data and ensures that the test results can truly reflect the actual corrosion resistance of fiberglass, providing scientific and effective data support for the quality assessment of fiberglass products.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A device for testing the corrosion resistance of fiberglass, characterized in that, Includes temperature control components and detection components; The constant temperature component includes a box (10), and a cover plate (11) is hinged to the open end of the box (10). The box (10) contains a constant temperature liquid and can achieve constant temperature control. The detection assembly includes a test barrel (20), a sealing cap (21), and a placement frame (30); the sealing cap (21) is adapted to cover the opening end of the test barrel (20), the test barrel (20) is placed inside the box (10) and can be immersed in a constant temperature liquid, the inside of the test barrel (20) is used to hold a corrosion test solution; the placement frame (30) is detachably placed inside the test barrel (20), the placement frame (30) is used to support the sample body (13) to be tested and to completely immerse the sample body (13) in the test solution.

2. The test method of the fiberglass corrosion resistance testing device according to claim 1, characterized in that, It includes the following steps: S1. Sample preparation and molding: Molten glass is introduced into a high-temperature resistant mold through a guide structure and cast into shape. After cooling, it is demolded to obtain a complete and defect-free original fiberglass sample. S2. Sample finishing: The original sample after demolding is cut to length, polished and ground according to the test standard to ensure that the sample size accuracy and surface roughness meet the corrosion resistance test benchmark requirements; S3. Sample cleaning pretreatment: The finished sample is cleaned and cleaned in sequence with pure water and organic solvents that meet national standards to remove surface dust, oil and processing residues. S4. Initial constant weight test of sample: After cleaning, the sample is dried to constant weight under a set constant temperature condition. After cooling, the sample is weighed using a high-precision weighing device and the initial mass of the sample is recorded. S5. Corrosive medium and water bath system setup: Configure the corrosive test solution, place the test tank (20) in the box (10), set up the placement frame (30) and inject the corrosive solution, and at the same time complete the debugging and setting of the temperature, water level and preheating parameters of the box (10); S6. Constant temperature corrosion immersion test: After the temperature of the water tank (10) stabilizes to the set constant temperature range, place multiple sets of test samples on the placement frame (30) so that the samples are isolated from each other and completely immersed in the corrosion solution. After sealing, carry out long-term constant temperature immersion corrosion. S7. Sample post-processing and secondary constant weight test: After the corrosion immersion is completed, the sample is taken out, washed and neutralized with pure water and organic solvent in turn, and dried at constant temperature again until constant weight. After cooling, the final mass of the sample after corrosion is weighed and recorded. S8. Test data calculation and result judgment: Based on the mass difference of the sample before and after corrosion and the standard surface area of ​​the sample, calculate the corrosion rate of mass loss per unit surface area according to the national standard; The validity of the test is determined by the deviation value of the test data of multiple sets of parallel samples. If the data deviation exceeds the limit, the sample is re-prepared and retested.

3. The test method of the fiberglass corrosion resistance testing device according to claim 2, characterized in that, In step S1, a glass liquid guide device with an inverted V-shaped flow guiding structure is used below the fiberglass production line drawing screen to smoothly guide the high-temperature molten glass liquid into the high-temperature resistant mold. After naturally cooling to room temperature, the mold is demolded to obtain a fiberglass sample without cracks, defects, and a smooth surface.

4. The test method of the fiberglass corrosion resistance testing device according to claim 2, characterized in that, In step S2, the sample is precisely cut to size after the cutting line is marked by a cutting machine to prepare a cuboid sample with a fixed standard surface area. The overall cutting error is controlled to be ≤0.05mm. After cutting, the sample is finely polished and mirror polished by a grinding and polishing machine to control the surface roughness Ra≤0.8μm.

5. The test method of the fiberglass corrosion resistance testing device according to claim 2, characterized in that, In step S3, the polished sample is first cleaned multiple times with pure water, then immersed in anhydrous ethanol at room temperature for 8-12 minutes, and finally cleaned multiple times with secondary pure water to complete the surface cleaning pretreatment.

6. The test method of the fiberglass corrosion resistance testing device according to claim 2, characterized in that, In step S4, the sample drying temperature is set to 105℃±2℃. The constant weight criterion is that the difference between the two consecutive weight measurements is ≤0.002g. An analytical balance with an accuracy of 0.1mg is used to weigh the sample.

7. The test method of the fiberglass corrosion resistance testing device according to claim 2, characterized in that, In step S5, an analytical grade reagent is used in combination with secondary purified water to prepare a 0.5 mol / L sulfuric acid solution as the corrosive medium, with a total volume of 2 to 4 L. After injecting the corrosive solution into the test tank (20), a safe liquid level space is reserved, and the water bath liquid level is higher than the corrosive liquid level in the test tank (20). The preheating temperature of the chamber (10) is set to 90℃ and the preheating time is 1 h.

8. The test method of the fiberglass corrosion resistance testing device according to claim 2, characterized in that, In step S6, the water bath temperature is maintained at 90℃±1℃. The sample is picked up and placed using corrosion-resistant special clamps. The sample is placed on the placement frame (30) in a state of separation from each other and in point contact with the placement frame (30). The constant temperature corrosion immersion time is set to 90~100h.

9. The test method of the fiberglass corrosion resistance testing device according to claim 8, characterized in that, In step S7, the sample after corrosion test is first washed repeatedly with secondary pure water, then washed repeatedly with anhydrous ethanol for neutralization and purification, and then dried at a constant temperature of 105℃±2℃ to constant weight.

10. The test method of the fiberglass corrosion resistance testing device according to claim 8, characterized in that, In step S8, the standard surface area of ​​the fixed sample is 90 cm², and the corrosion rate is calculated according to the formula. Three sets of parallel sample tests are set up, and the relative standard deviation of corrosion rate (RSD) ≤ 5% is used as the criterion for determining the validity of the test data. If the deviation exceeds the standard, the sample is re-prepared and retested.

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