Testing device and method for high-flux accurate testing of dynamic erosion corrosion performance of material

Abstract

The invention discloses a high-flux testing device for accurately testing the dynamic erosion corrosion performance of a material, which comprises a testing kettle, a rotating system, a liquid circulating system and a liquid collecting tank, the rotating system comprises a motor and a rotating blade, and the rotating blade is provided with a sample; the invention further discloses a testing method for high-flux accurate testing of the dynamic erosion corrosion performance of the material. The method comprises the step of injecting the corrosion solution to scour a sample. The rotation system is arranged to realize rotation of the sample, the test kettle and the liquid circulation system matched with the test kettle are arranged to realize erosion of the corrosion solution to the sample, the flow rate is controllable, the corrosion solution can be reused, and a plurality of samples can be subjected to long-time erosion corrosion test in the same environment and under different test conditions. The corrosion performance of the material under the same corrosion environment, different operation states and different temperatures is accurately obtained, so that the function of accurately testing the dynamic erosion corrosion performance at high flux is realized, and the testing device has the characteristics of high safety coefficient, convenience in operation and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of corrosion testing devices, and in particular relates to a testing device and method for high-throughput and accurate testing of dynamic erosion and corrosion performance of materials. Background Art

[0002] At present, the mass loss method generally used to evaluate the corrosion rate of materials is often affected by the accuracy of mass weighing and surface area estimation, resulting in errors. It is difficult to effectively evaluate the difference in corrosion resistance for materials with similar corrosion rates. In addition, there is still no unified test device for rapid evaluation of the erosion corrosion resistance of materials, and the devices used in the test room are often developed for the working conditions required for the current test. The test devices generally designed cannot simultaneously meet the requirements of multiple samples in the same environment but under different operating conditions (different linear speeds, centrifugal forces, etc.) for the corresponding dynamic erosion corrosion performance tests. Erosion corrosion test devices have a wide range of application backgrounds in many industrial fields, such as marine engineering, oil and gas production and gathering, petrochemicals, energy, etc. In these fields, it is of great significance to evaluate the erosion corrosion resistance of materials, optimize equipment structure design, and extend the service life of equipment.

[0003] Therefore, based on the above analysis, a method and a testing device that can accurately test the dynamic erosion-corrosion performance of multiple samples are urgently needed. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a high-throughput and accurate test device for dynamic erosion-corrosion performance of materials in view of the deficiencies of the above-mentioned prior art. The device realizes the rotation of the sample by setting a rotating system, and realizes the erosion of the sample by the corrosive solution through the test kettle and the liquid circulation system matched therewith, and the flow rate is controllable, the corrosive solution can be reused, and multiple samples can be subjected to long-term erosion-corrosion tests in the same environment but under different test conditions at the same time, so as to accurately obtain the erosion-corrosion resistance of the material in the same corrosive environment, different operating states and different temperatures.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a test device for high-throughput and accurate testing of the dynamic erosion and corrosion performance of materials, characterized in that the test device includes a test kettle, a rotating system is arranged on the test kettle, the rotating system includes a motor, the output shaft of the motor is connected to a rotating blade extending into the test kettle, the liquid-facing surface of the rotating blade is provided with a mounting assembly for mounting a specimen, the test kettle is equipped with a liquid circulation system, and a liquid collecting tank connected to the liquid circulation system is arranged on the outside of the test kettle.

[0006] The above-mentioned high-throughput and precise testing device for dynamic erosion and corrosion performance of materials is characterized in that a plurality of evenly distributed drainage holes are designed at the upper end of the test kettle, and the distribution area of ​​the drainage holes is from two-thirds of the height of the test kettle to the top of the kettle mouth. A liquid outlet pipe is arranged at the lower part of the test kettle, and the liquid outlet pipe is equipped with a liquid outlet valve.

[0007] The above-mentioned high-throughput and precise testing device for dynamic erosion and corrosion performance of materials is characterized in that the rotating blades are located in the middle of the test kettle, and the rotating blades are three rectangular polytetrafluoroethylene plates, and the angle between adjacent polytetrafluoroethylene plates is 120°; each of the rotating blades is provided with two slide rails, and the sample is mounted on the slide rails through a mounting assembly, and the mounting assembly is a polytetrafluoroethylene bolt and a polytetrafluoroethylene nut.

[0008] The above-mentioned high-throughput and precise testing device for dynamic erosion and corrosion performance of materials is characterized in that the liquid circulation system includes a liquid storage tank equipped with an oil bath heater, the liquid storage tank is equipped with an agitator, the liquid storage tank is connected to a peristaltic pump through a first output pipeline and an output valve, the peristaltic pump is connected to a second output pipeline extending into the test kettle, the second output pipeline is sequentially provided with an electronic flow meter, a control valve and an electric regulating valve, and the first output pipeline and the second output pipeline are both coated with a silicate tube on the outside.

[0009] The above-mentioned high-throughput and precise testing device for dynamic erosion and corrosion performance of materials is characterized in that the liquid circulation system also includes a liquid collector, which is connected to a third output pipeline extending into the test kettle, and the third output pipeline is sequentially provided with a first corrosion-resistant diaphragm pump and a cleaning valve.

[0010] The above-mentioned high-throughput and precise testing device for dynamic erosion and corrosion performance of materials is characterized in that the liquid collecting tank is connected to the liquid storage tank and the liquid collector respectively through a T-shaped pipeline, and is respectively provided with a first input valve and a second input valve, and U-shaped pipelines are provided at both ends of the second input valve on the T-shaped pipeline, and a third input valve, a second corrosion-resistant diaphragm pump, and a fourth input valve are sequentially provided on the U-shaped pipeline.

[0011] In addition, the present invention also provides a method for high-throughput and accurate testing of dynamic erosion and corrosion performance of materials, characterized in that the method comprises the following steps:

[0012] Step 1: Process the metal material to be tested, then polish the surface to make it smooth, obtain a corrosion sample, and measure the mass, surface area and density of the corrosion sample; the corrosion sample is processed with 4 bolt through holes;

[0013] Step 2: The corrosion sample obtained in step 1 is mounted on the rotating blade by using bolts and nuts to obtain a device to be tested;

[0014] Step 3, prepare a corrosive solution and test the ion concentration of the corrosive solution, then close the first input valve, the third input valve, the second corrosion-resistant diaphragm pump, the fourth input valve, the first corrosion-resistant diaphragm pump, the cleaning valve and the liquid outlet valve of the device to be tested obtained in step 2, and then inject the corrosive solution into the liquid storage tank; the corrosive solution is an acid solution, an alkali solution, a salt solution, an organic solvent or an aqueous solution;

[0015] Step 4: Open the oil bath heater, stirrer, output valve, peristaltic pump, electronic flow meter, control valve, electric regulating valve, motor and second input valve of the device to be tested after the corrosion solution is injected in step 3, so that the rotating blade starts to rotate, and inject the corrosion solution into the test kettle to perform the erosion corrosion performance evaluation test;

[0016] Step 5: When the corrosion solution in the liquid storage tank for the erosion corrosion performance evaluation test in step 4 is exhausted, the test is suspended and the test time is recorded;

[0017] Step 6: Open the first corrosion-resistant diaphragm pump, the cleaning valve, and the liquid outlet valve in the device where the test is suspended in step 5, and rinse the test kettle with the corrosion solution in the liquid collector. The corrosion solution after rinsing flows back to the liquid collector;

[0018] Step 7, close the first corrosion-resistant diaphragm pump, the cleaning valve and the second input valve of the device after rinsing in step 6, open the third input valve, the second corrosion-resistant diaphragm pump, the fourth input valve and the first input valve, and use the second corrosion-resistant diaphragm pump to transfer the corrosion solution in the liquid collector to the liquid storage tank;

[0019] Step 8: Repeat steps 4 to 7 for multiple times to perform multiple erosion and corrosion performance evaluation tests, record the total test time, and complete the test;

[0020] Step 9: Weigh the corrosion sample tested in step 8, detect the ion concentration of the corrosion solution after the test, and then calculate to obtain the dynamic erosion corrosion performance.

[0021] The above method is characterized in that the corrosion samples in step 2 are 1 to 3 groups, the number of the corrosion samples in each group is 3, the positions of the corrosion samples in each group on the rotating blades correspond to each other, and when the corrosion samples are 2 or 3 groups, the spacing between adjacent corrosion samples is equal. In the present invention, by controlling the number of corrosion samples and the positions of the corrosion samples, the corrosion samples are simultaneously tested for high-throughput dynamic erosion corrosion performance in the same environment but under different operating conditions (different linear speeds, centrifugal forces, etc.).

[0022] The above method is characterized in that the mass in step 1 and step 9 is weighed by a balance with an accuracy of one hundred thousandth, the surface area in step 1 is modeled and calculated by CREO drawing software, and the ion concentration in step 3 and step 9 is obtained by inductively coupled plasma emission spectrometer analysis.

[0023] The above method is characterized in that the calculation in step nine adopts the following formula:

[0024] The calculation formula for obtaining the corrosion rate based on the mass loss before and after the test is:

[0025] Where:

[0026] R—Corrosion rate calculated by mass loss method, unit: mm / a;

[0027] M—the mass of the corrosion sample before the test, in g;

[0028] N—the mass of the corrosion sample after the test, in g;

[0029] S—total surface area of ​​the corrosion sample, in cm 2 ;

[0030] T—total test time, unit: h;

[0031] D—density of the corrosion sample, unit: kg / m 3 ;

[0032] The calculation formula for obtaining the corrosion rate based on the ion concentration of the corrosion solution before and after the test is:

[0033] Where:

[0034] R c —Corrosion rate calculated by ion concentration method, unit: mm / a;

[0035] C 1 —The ion concentration of the element to be measured in the corrosion solution before the test, in g / L;

[0036] C 2 —The ion concentration of the element to be measured in the corrosion solution after the test, in g / L;

[0037] V—volume of the corrosive solution, unit L;

[0038] S—total surface area of ​​the corrosion sample, in cm 2 ;

[0039] T—total test time, unit: h;

[0040] D—density of the corrosion sample, unit: kg / m 3;

[0041] The mathematical statistics method of the calculation adopts the following formula:

[0042] Assume that the corrosion rates of n corrosion samples are R 1 , R 2 、······R n , which satisfies:

[0043] In the formula is the average corrosion rate of n corrosion samples, P n is the average difference in corrosion rate of n corrosion samples, R m The value reflects the degree of difference between the mass loss values ​​relative to the average mass loss value, and is used to evaluate the stability and reliability of the corrosion rate calculation results obtained by the mass loss method. e The value is the average of the corrosion rates obtained by the mass loss method and the ion concentration detection method, which can accurately reflect the corrosion rate of the measured material under simulated working conditions.

[0044] Compared with the prior art, the present invention has the following advantages:

[0045] 1. The present invention realizes the rotation of the sample by setting a rotating system, realizes the flushing of the sample by the corrosive solution through the test kettle and the liquid circulation system matched therewith, and the flow rate is controllable, the corrosive solution can be reused, and multiple samples can be subjected to long-term flushing corrosion tests in the same environment but under different test conditions at the same time, and the corrosion performance of the material in the same corrosive environment, different operating conditions and different temperatures can be accurately obtained, thereby realizing the test of the dynamic flushing corrosion performance of the sample, with high safety factor and easy operation.

[0046] 2. The testing device of the present invention can realize dynamic erosion-corrosion performance tests of various materials (metals, ceramics, polymer materials, etc.) in different corrosion environments (acids, alkalis, salts, organic solvents, aqueous solutions), different temperatures (25°C to 100°C), and different erosion speeds (0 to 2500rpm) while ensuring stable operation. It can also perform dynamic erosion-corrosion performance tests on materials in the same environment but under different operating conditions (different linear speeds, centrifugal forces, etc.), thereby achieving the purpose of high-throughput testing.

[0047] 3. The present invention adopts a test method that combines mass loss and ion concentration detection, and accurately obtains the material corrosion rate through mathematical statistics. Compared with existing similar test methods, the present test method can accurately obtain the dynamic corrosion rate of the material and is applicable to all material systems.

[0048] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a structural schematic diagram of a testing device for high-throughput and accurate testing of dynamic erosion and corrosion performance of materials according to the present invention.

[0050] Figure 2 It is a structural schematic diagram of the rotating blades in the testing device for high-throughput and accurate testing of dynamic erosion and corrosion performance of materials of the present invention.

[0051] Figure 3 It is a schematic diagram of the connection relationship between the sample and the rotating blade in the testing device for high-throughput and accurate testing of the dynamic erosion and corrosion performance of materials of the present invention.

[0052] Figure 4 It is a schematic diagram of the positional relationship between the sample and the rotating blade in Example 2 of the present invention.

[0053] Figure 5 It is a schematic diagram of the positional relationship between the sample and the rotating blade in Example 3 of the present invention.

[0054] Figure 6 It is a schematic diagram of the positional relationship between the sample and the rotating blade in Example 4 of the present invention.

[0055] Description of reference numerals:

[0056] 1—test kettle; 2—motor; 3—rotating blades;

[0057] 3-1—slide rail; 3-2—mounting assembly;

[0058] 4—liquid collecting tank; 5—liquid drain hole; 6—liquid outlet valve;

[0059] 7—sample; 8—oil bath heater; 9—liquid storage tank;

[0060] 10—agitator; 11—first output pipeline; 12—output valve;

[0061] 13—peristaltic pump; 14—second output pipeline; 15—electronic flow meter;

[0062] 16—control valve; 17—electric regulating valve; 18—silicate pipe;

[0063] 19—liquid collector; 20—third output pipeline; 21—first corrosion-resistant diaphragm pump;

[0064] 22—cleaning valve; 23—T-shaped pipeline; 24—first input valve;

[0065] 25—second input valve; 26—U-shaped pipeline; 27—third input valve;

[0066] 28—second corrosion-resistant diaphragm pump; 29—fourth input valve. DETAILED DESCRIPTION

[0067] A high-throughput and accurate testing device for dynamic erosion-corrosion performance of materials of the present invention is described in detail through Example 1.

[0068] Example 1

[0069] like Figure 1 As shown, the test device for high-throughput and accurate testing of dynamic erosion-corrosion performance of materials in this embodiment includes a test kettle 1, on which a rotating system is arranged, and the rotating system includes a motor 2. The output shaft of the motor 2 is connected to a rotating blade 3 extending into the test kettle 1, and the liquid-facing surface of the rotating blade 3 is provided with a mounting component 3-1 for mounting a sample 7. The test kettle 1 is equipped with a liquid circulation system, and a liquid collecting tank 4 connected to the liquid circulation system is arranged on the outer side of the test kettle 1.

[0070] It should be noted that, in this embodiment, a rotation system is provided to realize the rotation of the sample 7 , and the corrosive solution is flushed on the sample 7 through the test kettle 1 and the liquid circulation system coordinated therewith, thereby realizing the dynamic flushing corrosion performance test of the sample 7 .

[0071] It should be noted that the rotation of the rotating blades 3 causes the corrosive solution and the sample 7 to produce relative motion displacement, thereby realizing the flushing effect of the corrosive medium on the sample 7. The rotation of the rotating blades 3 will throw out the corrosive solution injected into the test kettle 1 by the liquid circulation system. The main purpose is that since the corrosive solution continuously flows into the test kettle 1, the corrosive solution in the test kettle 1 continuously accumulates, and it is difficult for the corrosive solution in the test kettle 1 to reach a dynamic balance, increasing the resistance of the rotating blades 3. Under the action of centrifugal force, the corrosive solution will also move from bottom to top. If the excess corrosive solution is not discharged in time, it will eventually cause the corrosive solution to flow out of the test kettle 1, causing a safety accident.

[0072] It should be noted that, in this embodiment, the rotation speed of the sample 7 is controlled by setting the motor 2 and controlling the rotation speed of the motor 2, so as to test the dynamic erosion corrosion performance under different erosion conditions. By setting the mounting component 3-1, the installation position of the sample 7 is controlled, and the sample 7 is placed in different linear speed environments, so as to test the dynamic erosion corrosion performance under different erosion conditions.

[0073] It should be noted that, in this embodiment, the liquid collecting tank 4 is provided to collect the corrosion solution thrown out of the test kettle 1 to prevent contamination of other components, and the corrosion solution is recycled, thereby improving the accuracy of the test.

[0074] It should be noted that abrasive particles may be introduced into the corrosion solution in this embodiment to achieve the test of corrosion performance under the combined action of scouring and abrasive corrosion.

[0075] It should be noted that the relevant parts in the test device that are in contact with the corrosive solution are coated with polytetrafluoroethylene to prevent corrosion of the relevant parts, and can be applied to various complex corrosive environments such as acid, alkali, salt, organic solvent, aqueous solution, etc.

[0076] like Figure 1 As shown, in this embodiment, a plurality of evenly distributed drainage holes 5 are designed at the upper end of the test kettle 1, and the distribution area of ​​the drainage holes 5 is from two-thirds of the height of the test kettle 1 to the top of the kettle mouth. A liquid outlet pipe is provided at the lower part of the test kettle 1, and the liquid outlet pipe is equipped with a liquid outlet valve 6. By controlling the position of the drainage holes 5, the test kettle 1 can contain a certain amount of corrosive solution for the flushing corrosion performance test of the sample 7, and the excess solution flowing into the test kettle 1 can be discharged in time. By providing the liquid outlet pipe and the liquid outlet valve 6, the corrosive solution in the test kettle 1 can be discharged after the flushing corrosion performance test.

[0077] like Figure 1 to Figure 3 As shown, in this embodiment, the rotating blade 3 is located in the middle of the test kettle 1, and the rotating blade 3 is three rectangular polytetrafluoroethylene plates, and the angle between adjacent polytetrafluoroethylene plates is 120°; each of the rotating blades 3 is provided with two slide rails 3-2, and the sample 7 is mounted on the slide rail 3-2 through a mounting assembly 3-1, and the mounting assembly 3-1 is a polytetrafluoroethylene bolt and a polytetrafluoroethylene nut. By controlling the rotating blade 3 to be located in the middle of the test kettle 1, it is ensured that the corrosion environment of each blade of the rotating blade 3 is the same during rotation, and by controlling the material of the rotating blade 3, the rotating blade 3 is prevented from being corroded, and by controlling the angle of the rotating blade 3, it is ensured that the sample 7 on the rotating blade 3 has a sufficient flushing effect, and by using the slide rail 3-2 and the polytetrafluoroethylene bolt and polytetrafluoroethylene nut to install the sample 7, it is convenient to adjust the position of the sample 7.

[0078] like Figure 1As shown, in this embodiment, the liquid circulation system includes a liquid storage tank 9 equipped with an oil bath heater 8, the liquid storage tank 9 is equipped with a stirrer 10, the liquid storage tank 9 is connected to a peristaltic pump 13 through a first output pipeline 11 and an output valve 12, the peristaltic pump 13 is connected to a second output pipeline 14 extending into the test kettle 1, the second output pipeline 14 is sequentially provided with an electronic flow meter 15, a control valve 16 and an electric regulating valve 17, and the first output pipeline 11 and the second output pipeline 14 are both coated with a silicate tube 18. By adopting a liquid storage tank 9 equipped with an oil bath heater 8, the corrosion solution in the liquid storage tank 9 is heated to achieve the test of thermal erosion corrosion performance, by arranging a stirrer 10 to make the corrosion solution more uniform, by arranging a peristaltic pump 13 to inject the corrosion solution into the test kettle 1, by arranging an electronic flow meter 15 to record the flow of the corrosion solution, it is convenient to control the erosion effect, by arranging an electric regulating valve 17 mainly to cooperate with the feedback of the electronic flow meter 15 to more accurately control the flow of the corrosion solution, by arranging a control valve 16 mainly used when the test kettle 1 fails to operate, even in the case of power failure, the valve can be manually closed to prevent the corrosion solution from flowing into the test kettle 1 in time, and by coating the silicate tube 18, the heated corrosion solution is kept warm to avoid temperature loss.

[0079] like Figure 1 As shown, in this embodiment, the liquid circulation system also includes a liquid collector 19, and the liquid collector 19 is connected to a third output pipeline 20 extending into the test kettle 1, and the third output pipeline 20 is sequentially provided with a first corrosion-resistant diaphragm pump 21 and a cleaning valve 22. The corrosive solution thrown out of the test kettle 1 is collected by setting the liquid collector 19 for subsequent testing, and the remaining corrosive solution of the test kettle 1 is collected after the test is completed. The corrosive solution collected in the liquid collector 19 is re-injected into the test kettle 1 by setting the first corrosion-resistant diaphragm pump 21, the test kettle 1 is rinsed clean, and the corrosive solution is re-collected in the liquid collector 19, thereby improving the test accuracy.

[0080] like Figure 1As shown, in this embodiment, the liquid collecting tank 4 is connected to the liquid storage tank 9 and the liquid collector 19 respectively through a T-shaped pipeline 23, and is respectively provided with a first input valve 24 and a second input valve 25, and a U-shaped pipeline 26 is provided at both ends of the second input valve 25 on the T-shaped pipeline 23, and a third input valve 27, a second corrosion-resistant diaphragm pump 28, and a fourth input valve 29 are sequentially provided on the U-shaped pipeline 26. By setting a T-shaped pipeline 23, the corrosive solution in the liquid collecting tank 4 is input into the liquid collector 19, and the corrosive solution in the liquid collector 19 is input into the liquid storage tank 9. By setting a first input valve 24 and a second input valve 25, the first input valve 24 is closed and the second input valve 25 is opened during testing to allow the corrosive solution in the liquid collecting tank 4 to be input into the liquid collector 19. After the liquid collector 19 collects all the corrosive solutions, a U-shaped pipeline 26, a third input valve 27, a second corrosion-resistant diaphragm pump 28, and a fourth input valve 29 are set and all are opened to allow the corrosive solution in the liquid collector 19 to be input into the liquid storage tank 9.

[0081] A high-throughput and accurate testing method for dynamic erosion-corrosion performance of materials of the present invention is described in detail through Examples 2 to 3.

[0082] Example 2

[0083] This embodiment includes the following steps:

[0084] Step 1: Process the metal material to be tested and then polish the surface to make it smooth to obtain three corrosion samples 7. The mass, surface area and density of each corrosion sample 7 are measured. The masses are M and 1 、M 2 、M 3 The surface areas are S 1 , S 2 , S 3 , the density is D; each of the corrosion samples 7 is processed with 4 bolt through holes;

[0085] Step 2: Check whether the relevant systems of the device are normal, and then install the three corrosion samples 7 obtained in step 1 on the rotating blade 3 using bolts and nuts to obtain the device to be tested. Figure 4 , the hollow arrow in the figure indicates the rotation direction of the rotating blade 3;

[0086] Step 3: Prepare the corrosion solution and test the ion concentration of the corrosion solution to C 1 , then close the first input valve 24, the third input valve 27, the second corrosion-resistant diaphragm pump 28, the fourth input valve 29, the first corrosion-resistant diaphragm pump 21, the cleaning valve 22 and the liquid outlet valve 6 of the device to be tested obtained in step 2, and then inject the corrosive solution into the liquid storage tank 9; the corrosive solution is an acid solution;

[0087] Step 4: Open the oil bath heater 8, agitator 10, output valve 12, peristaltic pump 13, electronic flow meter 15, control valve 16, electric regulating valve 17, motor 2 and second input valve 25 of the device to be tested after the corrosive solution is injected in step 3, so that the rotating blade 3 starts to rotate, and inject the corrosive solution into the test kettle 1 to set the flow parameters through the peristaltic pump 13 to perform the erosion corrosion performance evaluation test;

[0088] Step 5: When the corrosion solution in the liquid storage tank 9 for the erosion corrosion performance evaluation test in step 4 is exhausted, the test is suspended and the test time is recorded;

[0089] Step 6: Open the first corrosion-resistant diaphragm pump 21, the cleaning valve 22, and the liquid outlet valve 6 in the device where the test is suspended in step 5, and rinse the test kettle 1 with the corrosion solution in the liquid collector 19. The corrosion solution after rinsing flows back to the liquid collector 19;

[0090] Step 7, close the first corrosion-resistant diaphragm pump 21, the cleaning valve 22 and the second input valve 25 of the device after rinsing in step 6, open the third input valve 27, the second corrosion-resistant diaphragm pump 28, the fourth input valve 29 and the first input valve 24, and use the second corrosion-resistant diaphragm pump 28 to transfer the corrosive solution in the liquid collector 19 to the liquid storage tank 9;

[0091] Step 8: Repeat steps 4 to 7 for multiple times to perform multiple erosion and corrosion performance evaluation tests, record the total test time T, and complete the test;

[0092] Step 9: Weigh the corrosion test completed in step 8, the mass is N 1 、N 2 、N 3 , and detect the ion concentration C of the corrosion solution after the test 2 , and then the dynamic erosion-corrosion performance is calculated;

[0093] The calculation process is as follows: first, the corrosion rates of the three samples 7 are obtained according to the mass loss:

[0094]

[0095] Then, the stability and reliability of the corrosion rate calculation results obtained by the mass loss method are evaluated:

[0096]

[0097] Get R m After the value is obtained, the reliability of the calculation result is determined according to the accuracy required by the test; after determining that the calculation result of the mass loss method is reliable, the average corrosion rate of the three samples 7 is obtained according to the ion concentration method:

[0098]

[0099] Finally, the mass loss and ion concentration methods are combined to obtain a more accurate average corrosion rate: Get dynamic erosion-corrosion performance.

[0100] The corrosive solution in this embodiment may also be an alkaline solution, a salt solution, an organic solvent or an aqueous solution.

[0101] Example 3

[0102] The difference between this embodiment and embodiment 2 is that six corrosion samples 7 are mounted on the rotating blades 3 by bolts and nuts to obtain a device to be tested. Figure 5 , the hollow arrow in the figure indicates the rotation direction of the rotating blade 3.

[0103] Example 4

[0104] The difference between this embodiment and embodiment 2 is that 9 corrosion samples 7 are installed on the rotating blade 3 by bolts and nuts to obtain a device to be tested. Figure 6 , the hollow arrow in the figure indicates the rotation direction of the rotating blade 3.

[0105] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent change made to the above embodiment according to the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A high-throughput and accurate testing device for dynamic erosion and corrosion performance of materials, characterized in that: The test device comprises a test kettle (1), the test kettle (1) is provided with a rotating system, the rotating system comprises a motor (2), the output shaft of the motor (2) is connected with a rotating blade (3) extending into the test kettle (1), the liquid-facing surface of the rotating blade (3) is provided with a mounting component (3-1) for mounting a sample (7), the test kettle (1) is equipped with a liquid circulation system, and the outer side of the test kettle (1) is provided with a liquid collecting tank (4) connected with the liquid circulation system.

2. A high-throughput and accurate testing device for dynamic erosion and corrosion performance of materials according to claim 1, characterized in that: The upper end of the test kettle (1) is designed with a plurality of evenly distributed drainage holes (5), the distribution area of ​​the drainage holes (5) is from two-thirds of the height of the test kettle (1) to the top of the kettle mouth, and the lower part of the test kettle (1) is provided with a liquid outlet pipe, and the liquid outlet pipe is equipped with a liquid outlet valve (6).

3. A high-throughput and accurate testing device for dynamic erosion and corrosion performance of materials according to claim 1, characterized in that: The rotating blades (3) are located in the middle of the test kettle (1); the rotating blades (3) are three rectangular polytetrafluoroethylene plates, and the angle between adjacent polytetrafluoroethylene plates is 120°; each of the rotating blades (3) is provided with two slide rails (3-2), and the sample (7) is mounted on the slide rails (3-2) via a mounting assembly (3-1), and the mounting assembly (3-1) is a polytetrafluoroethylene bolt and a polytetrafluoroethylene nut.

4. A high-throughput and accurate testing device for dynamic erosion and corrosion performance of materials according to claim 1, characterized in that: The liquid circulation system comprises a liquid storage tank (9) equipped with an oil bath heater (8), the liquid storage tank (9) is equipped with a stirrer (10), the liquid storage tank (9) is connected to a peristaltic pump (13) via a first output pipeline (11) and an output valve (12), the peristaltic pump (13) is connected to a second output pipeline (14) extending into the test kettle (1), the second output pipeline (14) is sequentially provided with an electronic flow meter (15), a control valve (16) and an electric regulating valve (17), and the first output pipeline (11) and the second output pipeline (14) are both coated with a silicate tube (18) on the outside.

5. A high-throughput and accurate testing device for dynamic erosion and corrosion performance of materials according to claim 4, characterized in that: The liquid circulation system further comprises a liquid collector (19), the liquid collector (19) being connected to a third output pipeline (20) extending into the test kettle (1), and a first corrosion-resistant diaphragm pump (21) and a cleaning valve (22) being arranged in sequence on the third output pipeline (20).

6. A high-throughput and accurate testing device for dynamic erosion and corrosion performance of materials according to claim 5, characterized in that: The liquid collecting tank (4) is connected to the liquid storage tank (9) and the liquid collector (19) respectively through a T-shaped pipeline (23), and is respectively provided with a first input valve (24) and a second input valve (25), and a U-shaped pipeline (26) is provided at both ends of the second input valve (25) on the T-shaped pipeline (23), and a third input valve (27), a second corrosion-resistant diaphragm pump (28), and a fourth input valve (29) are sequentially provided on the U-shaped pipeline (26).

7. A method for high-throughput and accurate testing of dynamic erosion-corrosion performance of materials using the testing device as claimed in any one of claims 1 to 6, characterized in that: The method comprises the following steps: Step 1: Processing the metal material to be tested, then polishing the surface to make it smooth, obtaining a corrosion sample (7), and measuring the mass, surface area and density of the corrosion sample (7); the corrosion sample (7) is processed with four bolt through holes; Step 2: The corrosion sample (7) obtained in step 1 is mounted on the rotating blade (3) by using bolts and nuts to obtain a device to be tested; Step 3, preparing a corrosion solution and testing the ion concentration of the corrosion solution, then closing the first input valve (24), the third input valve (27), the second corrosion-resistant diaphragm pump (28), the fourth input valve (29), the first corrosion-resistant diaphragm pump (21), the cleaning valve (22) and the liquid outlet valve (6) of the device to be tested obtained in step 2, and then injecting the corrosion solution into the liquid storage tank (9); the corrosion solution is an acid solution, an alkali solution, a salt solution, an organic solvent or an aqueous solution; Step 4: After the corrosive solution is injected in step 3, the oil bath heater (8), the stirrer (10), the output valve (12), the peristaltic pump (13), the electronic flow meter (15), the control valve (16), the electric regulating valve (17), the motor (2) and the second input valve (25) of the device to be tested are opened to start the rotation of the rotating blade (3), and the corrosive solution is injected into the test kettle (1) to perform an erosion corrosion performance evaluation test; Step 5: When the corrosion solution in the liquid storage tank (9) for the erosion corrosion performance evaluation test in step 4 is exhausted, the test is suspended and the test time is recorded; Step 6: Open the first corrosion-resistant diaphragm pump (21), the cleaning valve (22), and the liquid outlet valve (6) in the device where the test is suspended in step 5, and use the corrosion solution in the liquid collector (19) to rinse the test kettle (1), and the corrosion solution after rinsing flows back to the liquid collector (19); Step 7: close the first corrosion-resistant diaphragm pump (21), the cleaning valve (22) and the second input valve (25) of the device after rinsing in step 6, open the third input valve (27), the second corrosion-resistant diaphragm pump (28), the fourth input valve (29) and the first input valve (24), and use the second corrosion-resistant diaphragm pump (28) to transfer the corrosive solution in the liquid collector (19) to the liquid storage tank (9); Step 8: Repeat steps 4 to 7 for multiple times to perform multiple erosion and corrosion performance evaluation tests, record the total test time, and complete the test; Step 9: Weigh the corrosion sample tested in step 8, detect the ion concentration of the corrosion solution after the test, and then calculate to obtain the dynamic erosion corrosion performance.

8. The method according to claim 7, characterized in that In step 2, the number of corrosion samples (7) is 1 to 3, the number of corrosion samples (7) in each group is 3, the positions of the corrosion samples (7) in each group on the rotating blade (3) correspond to each other, and when the number of corrosion samples (7) is 2 or 3, the spacing between adjacent corrosion samples (7) is equal.

9. The method according to claim 7, characterized in that: The mass in step 1 and step 9 is weighed by a balance with an accuracy of one hundred thousandth, the surface area in step 1 is modeled and calculated by CREO drawing software, and the ion concentration in step 3 and step 9 is obtained by inductively coupled plasma optical emission spectrometer analysis.

10. The method according to claim 7, characterized in that The calculation described in step nine uses the following formula: The calculation formula for obtaining the corrosion rate based on the mass loss before and after the test is: Where: R—Corrosion rate calculated by mass loss method, unit: mm / a; M is the mass of the corrosion specimen (7) before the test, in g; N is the mass of the corrosion specimen (7) after the test, in g; S—total surface area of ​​the corrosion specimen (7), in cm 2 ; T—total test time, unit: h; D—density of the corrosion sample (7), in kg / m 3 ; The calculation formula for obtaining the corrosion rate based on the ion concentration of the corrosion solution before and after the test is: Where: R c —Corrosion rate calculated by ion concentration method, unit: mm / a; C1—The ion concentration of the element to be measured in the corrosion solution before the test, in g / L; C2—Ion concentration of the element to be measured in the corrosion solution after the test, in g / L; V—volume of the corrosive solution, unit L; S—total surface area of ​​the corrosion specimen (7), in cm 2 ; T—total test time, unit: h; D—density of the corrosion specimen (7), in kg / m 3 ; The mathematical statistics method of the calculation adopts the following formula: Assume that the corrosion rates of n corrosion specimens (7) are R1, R2, ······R n , which satisfies: In the formula is the average corrosion rate of n corrosion samples (7), P n is the average difference in corrosion rate of n corrosion samples (7), R m The value reflects the degree of difference between the mass loss values ​​relative to the average mass loss value, and is used to evaluate the stability and reliability of the corrosion rate calculation results obtained by the mass loss method. e The value is the average of the corrosion rates obtained by the mass loss method and the ion concentration detection method, which can accurately reflect the corrosion rate of the measured material under simulated working conditions.

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