Metal pipe erosion corrosion test device and use method

Abstract

The present invention provides a metal pipe scour corrosion test device, including a reactor and a water supply and drainage circulation device; the reactor is provided with an installation port, a water outlet, a water inlet and a sewage outlet from top to bottom, and the water supply and drainage device is connected with the water inlet and the water outlet of the reactor; a test device is provided inside the reactor between the water inlet and the water outlet; the test device includes a circular metal bracket, a test disc, a plastic pipe ring and a metal sample, the outer periphery of the metal bracket is fixed on the inner wall of the reactor, the test disc is placed on the metal bracket, and the inner diameter of the metal bracket is smaller than the outer diameter of the test disc. First, it creatively realizes the simulation of the corrosion of metal materials under the flow conditions of the water medium in the actual working conditions, which is highly consistent with the actual working conditions, and improves the accuracy and precision of the simulation experiment; second, the metal sample is fixed on the plastic pipe ring, which can avoid the potential difference between the metal sample and the test device and the test disc affecting the corrosion rate accuracy, and further improves the accuracy of the simulation experiment.

Description

Technical Field

[0001] The invention provides a metal pipe erosion corrosion test device and a use method, which are particularly suitable for erosion corrosion simulation experiments of multiple groups of metal material samples under the same test conditions. Background Art

[0002] As we all know, metal pipes are widely used in many fields such as municipal water supply and drainage, long-distance water diversion, urban heating, hydropower generation, etc., and have made significant contributions to the sustained, stable and healthy development of my country's economy and society.

[0003] Many domestic researchers have conducted a lot of in-depth research on the corrosion of metal pipes in transportation environments. However, these studies usually only bury metal pipe samples in water transmission media, which cannot simulate the corrosion of metal materials under the flow conditions of water transmission media in actual working conditions. Moreover, it is difficult to ensure that the experimental conditions of multiple groups of metal material samples are exactly the same. The inconsistency of test conditions directly leads to a significant reduction in the accuracy of the test results, and causes different degrees of deviation in the analysis results of metal material corrosion factors, which in turn affects the overall test results and metal pipeline corrosion protection. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings existing in the prior art and provide a metal pipe erosion corrosion test device and a method of use, which can simulate the water medium environment under different flow rate conditions, and multiple groups of test samples can be set in the device, and the test conditions of each group of samples can be guaranteed to be completely consistent, thereby ensuring the precision and accuracy of the test results.

[0005] The technical solution adopted by the present invention is:

[0006] A metal pipe scour corrosion test device comprises a reactor and a water supply and drainage circulation device; the reactor is provided with an installation port, a water outlet, a water inlet and a sewage outlet in sequence from top to bottom, and the water supply and drainage device is connected with the water inlet and the water outlet of the reactor; a test device is arranged inside the reactor between the water inlet and the water outlet; the test device comprises a circular ring-shaped metal bracket, a test disc, a plastic pipe ring and a metal sample, the outer periphery of the metal bracket is fixed on the inner wall of the reactor, the test disc is placed on the metal bracket, and the inner diameter of the metal bracket is smaller than the outer diameter of the test disc; the plastic pipe ring is arranged through the test disc, and the part of the plastic pipe ring protruding from the test disc is provided with two sample holes, the two sample holes are arranged oppositely and pass through the middle of the plastic pipe ring, and the aperture of the sample hole is greater than or equal to the side section length of the metal sample; the diameter of the installation port is greater than the diameter of the test disc.

[0007] Furthermore, the number of the test devices is 2 or more, the 2 or more test devices are vertically distributed, the inner diameters of the 2 or more metal brackets decrease from top to bottom, and the diameters of the test discs decrease from top to bottom; the length of the plastic tube ring is less than the spacing between adjacent metal brackets.

[0008] Furthermore, the number of plastic tube rings in each test disc is 6-18 groups; the through holes of the plastic tube rings in two adjacent layers of the test discs are not visible.

[0009] Furthermore, the test disc is detachably connected to the metal bracket by means of a locking device.

[0010] Furthermore, the locking device comprises a locking hole and a locking hook, wherein the locking hole is arranged on the metal bracket, and the locking hook is arranged on the bottom of the test disc, and the locking hook cooperates with the locking hole.

[0011] Furthermore, the locking hole is an elongated hole, which passes through the metal bracket; the locking hook is L-shaped, and the vertical length of the locking hook is greater than the thickness of the test disc, and the bending length is greater than the length of the elongated hole.

[0012] A method for using a metal pipe erosion corrosion test device comprises the following steps:

[0013] S1 inserts the metal sample into the sample hole of the plastic pipe ring;

[0014] S2 opens the installation port of the reactor, and installs the test discs on the metal bracket in order from small to large, so that the test discs and the plastic pipe ring form a simulated pipeline;

[0015] S3 closes the installation port and sewage outlet of the reactor;

[0016] S4 operates the water supply and drainage circulation device, and the medium is flushed in from the water inlet;

[0017] The S5 medium runs in a simulated pipeline environment with a pressure of 0.5MPA-4MPA in the reactor, and then is discharged from the outlet;

[0018] S6 Close the water supply and drainage circulation device, release the pressure, open the sewage outlet and the installation port, and take out the test disc;

[0019] S7 detects metal specimens in plastic pipe rings.

[0020] The beneficial effects obtained by the present invention are as follows: first, the corrosion of metal materials under the flow conditions of water medium in the actual working conditions is creatively realized, which is highly consistent with the actual working conditions and improves the accuracy and precision of the simulation experiment; second, the metal sample is fixed on the plastic pipe ring, which can avoid the potential difference between the metal sample and the test device and the test disc from affecting the accuracy of the corrosion rate, and further improve the accuracy of the simulation experiment; third, by reducing the test disc from top to bottom and having only one plastic pipe ring in the same vertical direction, it is ensured that each metal sample belongs to an independent test environment and will not be disturbed by the external environment, so that the test device is equivalent to setting up several independent corrosion test devices, and finally achieves the purpose of both improving the test efficiency and reducing the test cost; fourth, the test disc adopts a "self-clamping" connection method, and the quick installation and disassembly functions can be realized only by rotating the test disc forward and backward, which greatly improves the test efficiency, saves the test cost, and reduces the difficulty of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention;

[0022] Figure 2 It is a front view of the metal sample of the present invention on the plastic pipe ring;

[0023] Figure 3 It is a cross-sectional view of the metal sample of the present invention on the plastic pipe ring;

[0024] Figure 4 The figure is a layout diagram of the plastic tube rings on the test disc of the present invention;

[0025] Figure 5 This is a schematic diagram of the test disc structure of the present invention;

[0026] Figure 6 This is a schematic diagram of the metal bracket structure of the present invention;

[0027] Figure 7 This is a schematic diagram of the connection structure between the test disc and the metal bracket of the present invention;

[0028] Among them, 1 represents the reactor, 2 represents the water outlet, 3 represents the water inlet, 4 represents the sewage outlet, 5 represents the metal bracket, 6 represents the test disc, 7 represents the plastic pipe ring, 8 represents the metal sample, 9 represents the locking hole, and 10 represents the locking hook. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] like Figure 1-7As shown, a metal pipe erosion corrosion test device comprises a reactor 1 and a water supply and drainage circulation device; the reactor 1 is provided with an installation port, a water outlet 2, a water inlet 3 and a sewage outlet 4 in sequence from top to bottom, and the water supply and drainage device is connected with the water inlet 3 and the water outlet 2 of the reactor 1; a test device is arranged inside the reactor 1 between the water inlet 3 and the water outlet 2; the test device comprises a circular ring-shaped metal bracket 5, a test disc 6, a plastic pipe ring 7 and a metal sample 8, the outer periphery of the metal bracket 5 is fixed on the inner wall of the reactor 1, the test disc 6 is placed on the metal bracket 5, and the inner diameter of the metal bracket 5 is smaller than the outer diameter of the test disc 6; the plastic pipe ring 7 is arranged through the test disc 6, and the part of the plastic pipe ring 7 protruding from the test disc 6 is provided with two sample holes, the two sample holes are arranged oppositely and pass through the middle of the plastic pipe ring 7, and the aperture of the sample hole is greater than or equal to the side section length of the metal sample 8; the diameter of the installation port is greater than the diameter of the test disc 6.

[0031] The number of the test devices is 2 or more, and the 2 or more test devices are vertically distributed. The inner diameters of the 2 or more metal brackets 5 decrease from top to bottom, and the diameters of the test discs 6 decrease from top to bottom. The length of the plastic tube ring 7 is less than the distance between adjacent metal brackets 5.

[0032] The number of plastic tube rings 7 in each test disc 6 is 6-18 groups; the through holes of the plastic tube rings 7 in two adjacent layers of the test discs 6 are not visible. The test disc 6 is detachably connected to the metal bracket 5 by means of a locking device. The locking device includes a locking hole 9 and a locking hook 10. The locking hole 9 is arranged on the metal bracket 5, and the locking hook 10 is arranged at the bottom of the test disc 6. The locking hook 10 cooperates with the locking hole 9. The locking hole 9 is a long hole, and the locking hole 9 runs through the metal bracket 5; the locking hook 10 is L-shaped, and the vertical length of the locking hook 10 is greater than the thickness of the test disc 6, and the bending length is greater than the length of the locking hole 9.

[0033] A method for using a metal pipe erosion corrosion test device comprises the following steps:

[0034] S1 inserts the metal sample 8 into the sample hole of the plastic tube ring 7;

[0035] S2: Open the installation port of the reactor 1, and install the test discs 6 on the metal bracket 5 in order from small to large, so that the test discs 6 and the plastic pipe ring 7 form a simulated pipeline;

[0036] S3 closes the installation port and the sewage outlet 4 of the reaction kettle 1;

[0037] S4 operates the water supply and drainage circulation device, and the medium is flushed in from the water inlet 3;

[0038] The S5 medium runs in a simulated pipeline environment with a pressure of 0.5MPA-4MPA in the reactor, and then is discharged from the outlet 2;

[0039] S6: Close the water supply and drainage circulation device, release the pressure, open the sewage outlet 4 and the installation port, and take out the test disc 6;

[0040] S7 detects the metal sample 8 in the plastic pipe ring 7.

[0041] During the specific implementation: the water pressure in the area divided by the test disc 6 in the reactor 1 remains exactly the same, and the same number of circular holes ensures the same water flow area, so the water flow speed near all metal samples 8 is basically the same; the test disc 6 decreases from top to bottom, and at the same time ensures that there is only one plastic tube ring 7 in the same vertical direction, the purpose is to ensure that each plastic tube ring 7 is independent and will not interfere with each other; the metal sample 8 is fixed on the plastic tube ring 7, which can ensure that there is no potential difference between the metal samples 8 and between the test disc 6 and the plastic tube ring 7 to cause electrochemical corrosion, affecting the accuracy of the corrosion rate, and the metal samples 8 do not interfere with each other, so as to further ensure the accuracy of the test, and also ensure that the metal sample 8 is not easily displaced by water flow. The water flow speed of the metal sample 8 in the plastic tube ring 7 can truly simulate the influence of the water flow speed in the actual engineering pipeline on the metal sample 8.

[0042] like Figure 4 As shown, the test discs 6 in the test device are of different sizes, decreasing from top to bottom, and there is only one plastic tube ring 7 at the same axial position, which can avoid mutual interference between the plastic tube rings 7 and ensure that each plastic tube ring 7 is independent, thereby ensuring the accuracy and independence of the test.

[0043] like Figure 5-7 As shown, the test disc 6 and the metal bracket 5 are fixed by a "self-clamping" method, and the test disc 6 is provided with a plurality of locking hooks 10, and the number of locking holes 9 and locking hooks 10 is the same. When installing, the test disc 6 is first rotated to make the locking hooks 10 correspond to the long holes, and then the locking hooks 10 are completely embedded in the long holes under the action of the self-weight of the test disc 6, and finally the test disc 6 is continued to be rotated, so that the test disc 6 with the locking hooks 10 can be completely installed in place; when disassembling, the test disc 6 is first rotated in the opposite direction to make the locking hooks 10 correspond to the long holes on the metal bracket 5, and then the test disc 6 can be completely taken out to achieve rapid disassembly.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A metal pipe erosion corrosion test device, characterized in that: The invention comprises a reactor (1) and a water supply and drainage circulation device; the reactor (1) is provided with a mounting port, a water outlet (2), a water inlet (3) and a sewage outlet (4) in order from top to bottom; the water supply and drainage circulation device is connected to the water inlet (3) and the water outlet (2) of the reactor (1); a test device is provided inside the reactor (1) between the water inlet (3) and the water outlet (2); the test device comprises a circular metal bracket (5), a test disc (6), a plastic pipe ring (7) and a metal sample (8); the outer periphery of the metal bracket (5) is The test disc (6) is fixed on the inner wall of the reaction kettle (1), and the test disc (6) is placed on the metal bracket (5). The inner diameter of the metal bracket (5) is smaller than the outer diameter of the test disc (6) placed thereon; the plastic tube ring (7) is arranged through the test disc (6), and the part of the plastic tube ring (7) protruding from the test disc (6) is provided with two sample holes, the two sample holes are arranged opposite to each other and pass through the middle of the plastic tube ring (7), and the diameter of the sample holes is greater than or equal to the side section length of the metal sample (8); the diameter of the mounting opening is greater than the diameter of the test disc (6); The number of the test devices is 2 or more groups, the 2 or more groups of test devices are vertically distributed, the inner diameters of the 2 or more groups of metal brackets (5) decrease from top to bottom, and the diameters of the test discs (6) decrease from top to bottom, and there is only one plastic tube ring (7) in the same vertical direction; the length of the plastic tube ring (7) is less than the spacing between adjacent metal brackets (5); The number of plastic tube rings (7) in each test disc (6) is 6-18 groups; the through holes of the plastic tube rings (7) in two adjacent layers of the test discs (6) are not visible; The test disc (6) is detachably connected to the metal bracket (5) by means of a locking device.

2. A metal pipe erosion corrosion test device according to claim 1, characterized in that: The locking device comprises a locking hole (9) and a locking hook (10); the locking hole (9) is arranged on the metal bracket (5); the locking hook (10) is arranged on the bottom of the test disc (6); the locking hook (10) cooperates with the locking hole (9).

3. A metal pipe erosion corrosion test device according to claim 2, characterized in that: The locking hole (9) is a long hole, and the locking hole (9) passes through the metal bracket (5); the locking hook (10) is L-shaped, and the vertical length of the locking hook (10) is greater than the thickness of the test disc (6), and the bending length is greater than the length of the locking hole (9).

4. A method for using a metal pipe erosion corrosion test device as described in any one of claims 1 to 3, characterized in that: The following steps are involved: S1 Insert the metal sample (8) into the sample hole of the plastic pipe ring (7); S2. Open the installation port of the reactor (1), and install the test discs (6) on the metal bracket (5) in order from small to large, so that the test discs (6) and the plastic pipe ring (7) form a simulated pipeline; S3: a mounting port and a sewage outlet (4) of a closed reactor (1); S4 operates the water supply and drainage circulation device, and the medium is flushed in from the water inlet (3); The S5 medium runs in a simulated pipeline environment with a pressure of 0.5MPA-4MPA in the reactor, and then is discharged from the outlet (2); S6 Close the water supply and drainage circulation device, release the pressure, open the sewage outlet (4) and the installation port, and remove the test disc (6); S7 Testing of the metal sample (8) in the plastic pipe ring (7).

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