A composite impact angle rotary erosion corrosion test device and test method

Abstract

The present invention relates to a composite impact angle rotary erosion corrosion test device, comprising a stirring mechanism, a sample rack, and a connecting piece, wherein the connecting piece is connected to the stirring mechanism, the sample rack is hinged to the connecting piece, the radial angle between the sample rack and the connecting piece can be adjusted, and the sample rack itself has a rotating shaft, which can axially adjust the sample angle. Compared with the prior art, the beneficial effect of the present invention is that the sample assembly in the test device can conveniently adjust the axial angle and radial angle of the sample impact surface, thereby constructing a composite attack angle of the fluid to study the erosion corrosion performance of the material.

Description

Technical Field

[0001] The invention relates to the field of corrosion, and in particular to a composite impact angle rotary erosion corrosion test device and a test method. Background Art

[0002] Erosion corrosion often occurs on various metals and alloys exposed to moving fluids in offshore and marine engineering, oil and gas production and flow-through parts. It is metal damage caused by high-speed relative movement between the metal surface and the corrosive fluid. In the erosion corrosion process, erosion and corrosion are two important factors. The damage caused by the interaction between the two to metal materials is far greater than the impact caused by a single factor. Especially when the fluid contains particles such as sand and gravel, the damage to the metal material is more serious, which greatly shortens its life and easily causes safety accidents and economic losses.

[0003] At present, there are three types of erosion corrosion test devices: pipe flow type, jet type and rotary type. Among them, the pipe flow device uses a circulation system to make the solid particles in the fluid evenly distributed, and makes the fluid impact the material surface in a certain flow shape to study the corrosion behavior of the material under different flow rates and flow conditions. However, the device requires a large space, a large amount of test solution, a long test cycle, high construction and operation costs, an unstable system, and relatively complex operation. The jet device is based on a structure in which a circulating pump and a nozzle generate a high-speed flow medium to impact the sample. It can accurately control the flow rate of the impact liquid flow and change the attack angle of the erosion, but it cannot simulate the actual working conditions well. Its erosion is more serious than the actual situation, and there is a certain gap with the actual erosion and corrosion conditions of pumps and pipelines. The rotary device changes the rotation rate and the diameter of the disc to form a series of different circumferential speeds on the surface of the sample, so as to achieve the study of the corrosion behavior of the material under different flow rates. The rotary test device has the advantages of simple device, small footprint, short test cycle, and small solution consumption (generally less than 4L). Therefore, this type of device is widely selected. However, the problem that the impact angle of the sample is not easy to adjust has always been the shortcoming of this device. The rotary scouring device can only control the axial angle of the fluid impacting the specimen, and cannot simulate the scouring behavior of fluids with compound attack angles (both axial and radial angles) such as propeller blades, elbows, and pipe connectors (tees and crosses). Often, the impact of fluids with compound attack angles on the surface of materials has a more serious impact on the corrosion behavior of the materials. Therefore, it is of great significance to construct an experimental device and test method with compound impact angles.

[0004] The patent "A specimen impact angle adjustment component of a rotary scouring wear test device" with the authorization announcement number CN205941176U can change the axial angle of the specimen, but cannot adjust the radial angle of the specimen, and the independent specimen adjustment component occupies a large space, the volume of the device is bound to increase, and the manufacturing cost and operating cost of the device are correspondingly increased. In the patent "A rotating impeller metal scouring corrosion test device" with the authorization announcement number CN204718938U, the specimen is installed on the inner wall of the solution tank, and the stirring impeller drives the solution to scour the specimen. The impact surface angle of the specimen cannot be changed, and the angle of attack of the solution cannot be changed either. The patent "A rotary experimental device for simulating scouring corrosion of the inner wall of a pipeline" with the authorization announcement number CN201010603782.X uses an annular specimen. The annular specimen can only simulate the scouring corrosion behavior of the fluid on the inner wall of the pipeline, and cannot be used to simulate complex angle of attack conditions such as propeller blades and the inside of a pump body. The document “Effect of Attack Angle on Erosion-Corrosion of Stainless Steel under Liquid-Solid Flow” (Metal Corrosion Control, 2002, 6(3), 22-25) uses a self-made dynamic rotating erosion-corrosion device, which can only adjust three axial angles of the sample (0°, 45° and 90°) but cannot adjust the radial attack angle. Summary of the invention

[0005] The purpose of the present invention is to provide a composite impact angle rotary erosion-corrosion testing device, in which the sample assembly can conveniently adjust the axial angle and radial angle of the sample impact surface, thereby constructing a composite attack angle of the fluid, thereby simulating the erosion behavior of composite attack angle fluids such as propeller blades, elbows, and pipe connectors (tees, crosses), to study the erosion-corrosion performance of materials.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A composite impact angle rotary erosion corrosion test device comprises a stirring mechanism, a sample rack and a connecting piece. The connecting piece is connected to the stirring mechanism, the sample rack is hinged to the connecting piece, the radial angle between the sample rack and the connecting piece can be adjusted, and the sample rack itself has a rotating shaft, which can axially adjust the sample angle.

[0008] The stirring mechanism comprises a motor, a main shaft, a turntable and a stirring wheel. The motor drives the main shaft to rotate. The turntable and the stirring wheel are respectively fixedly connected to the main shaft. The turntable is connected to the connecting piece.

[0009] The connecting piece includes a clamping shaft, a connecting piece connecting arm, a connecting piece adjusting groove, a threaded hole, and a connecting piece fixing hole. The clamping shaft is connected to the turntable by a turntable bolt. The connecting piece connecting arm is fixedly connected to the clamping shaft or is an integrated structure. The connecting piece connecting arm is provided with a connecting piece fixing hole, a connecting piece adjusting groove and a plurality of threaded holes. The connecting piece adjusting groove is arc-shaped. The connecting piece adjusting groove and the plurality of threaded holes are on the same arc with the connecting piece fixing hole as the center. The connecting piece fixing hole is a hinge axis hole between the sample rack and the connecting piece.

[0010] The connecting piece adjustment groove is a 1 / 4 arc, and there are two threaded holes. The central angle of the line connecting one threaded hole and the adjacent end of the connecting piece adjustment groove is 45°, and the central angle of the line connecting the other threaded hole and the adjacent end of the connecting piece adjustment groove is 90°.

[0011] The sample rack comprises a sample groove, a rotating shaft, a sample rack connecting arm, an adjusting piece, and an angle scale. A rotating shaft is provided between the sample groove and the sample rack connecting arm, and the rotating shaft is positioned by tightening a fixing bolt. The sample rack connecting arm is hinged to the connecting piece, the adjusting piece is on the sample rack connecting arm, the angle scale is on the sample rack connecting arm, the angle scale corresponds to the adjusting piece, and the elbow fixing holes are distributed at the four corners of the sample rack, and the elbow fixing holes are symmetrically arranged.

[0012] The adjusting member comprises an adjusting member adjusting groove, an angle fastener, an adjusting groove fastener, and an angle pointer. The adjusting member adjusting groove is an arc, which takes the hinge axis hole between the sample holder and the connecting member as the center and is cocircular with the connecting member adjusting groove on the connecting member. The angle fastener passes through the connecting member adjusting groove and the adjusting member adjusting groove. The adjusting groove fastener passes through the connecting member adjusting groove or the threaded hole on the connecting member and the adjusting member adjusting groove. The angle fastener and the adjusting groove fastener are used for angle adjustment between the sample holder and the connecting member. The angle pointer is fixed on the angle fastener, and the angle pointer corresponds to the angle scale.

[0013] The adjusting groove of the adjusting member is a 1 / 4 arc.

[0014] The stirring mechanism, the sample rack and the connecting piece are in the slurry tank, and a slurry tank cover is arranged at the upper end of the slurry tank.

[0015] The experimental samples used in the composite impact angle rotary erosion corrosion test device include flat samples and bent pipe samples (elbow, pipe fitting connection sample). The flat sample is embedded in the groove of the sample frame, and the bent pipe sample is fixed to the sample frame through the bent pipe fixing hole with a nylon tie.

[0016] A method for conducting a test using a composite impact angle rotary erosion corrosion test device comprises the following steps:

[0017] 1) Pre-treat the sample, then weigh and record the weight before the test m0, measure the surface area of ​​the sample and record it as S, and collect the morphological information of the sample before the test;

[0018] 2) Insert the connecting arm of the connector into the connecting arm of the sample holder, and pass the fixing fastener through the fixing hole of the connector and the fixing hole of the sample holder. According to the radial angle requirements of the test, adjust the radial angle of the sample holder and tighten the fixing fastener, angle fastener and adjustment slot fastener. The angle pointer on the angle fastener points to the center of the fixing fastener, and the pointer points to the angle scale. The read value is the angle value of the sample diameter.

[0019] 3) Fix the sample on the sample holder, use 2 to 3 parallel samples to carry out the test, adjust the rotation axis according to the test axial angle requirements, the angle between the bottom edge of the sample groove and the connecting arm of the sample holder is the axial angle, measure it with a protractor, tighten the fixing bolts to fix the sample and axial angle;

[0020] 4) Insert the sample rack and connecting rack with the sample into the turntable and tighten them with turntable gasket and turntable bolts;

[0021] 5) Select the actual working environment fluid, or configure the corresponding simulation fluid or accelerated test fluid in the laboratory;

[0022] 6) Inject the test fluid into the slurry tank; if there is a solid phase, add sand and gravel into the slurry tank, and control the strength of the sand and gravel to 350μm~400μm;

[0023] 7) Adjust the flow rate, start the motor to rotate the turntable and stirring blades, and record the test start time t1;

[0024] 8) Record the test end time t2, take out the sample, and observe and collect the sample morphology information after the test;

[0025] 9) Clean the sample, weigh it and record the weight m after the test, and use the weight loss method to calculate the corrosion rate of the material.

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

[0027] 1) The sample assembly in the present invention has the function of adjusting the axial and radial impact angles of the sample, constructing a composite impact angle, and has the characteristics of easy control, high precision, and convenient operation. The axial angle can be easily measured, and the radial angle can be determined by the scale line of the angle scale indicated by the angle pointer, which is easy to adjust and easy to measure.

[0028] 2) The sample assembly in the present invention can be directly installed in an existing rotary erosion and corrosion device, which is convenient and replaceable.

[0029] 3) The sample assembly in the present invention can adjust the axial and radial angles of the sample arbitrarily between 0° and 90°, and the angle can be accurate to 1°, with high angle measurement accuracy.

[0030] 4) The 1 / 4 circular design of the connector arm and the sample holder connecting arm in the present invention shortens the arm length when the two rotate relative to each other, reduces the angle adjustment space, and can be installed in the existing rotary erosion and corrosion equipment, thereby expanding the function of the existing equipment and increasing the economic benefits.

[0031] 5) The flat plate specimen and the bent pipe specimen in the present invention can simulate the working conditions of straight pipes, propellers, elbows, pipe connectors, etc., and the test method has higher simulation and scientificity. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the structure of a composite impact angle rotary erosion and corrosion device.

[0033] Figure 2 This is a top view of the interior of the slurry tank of the compound impact angle rotary erosion and corrosion device.

[0034] Figure 3 It is a side view of the sample assembly in the present invention.

[0035] Figure 4 for Figure 3 Top view of the .

[0036] Figure 5 Schematic diagram of the sample side of the sample rack.

[0037] Figure 6 A schematic diagram of the connector structure.

[0038] Figure 7 This is a schematic diagram of the thread position of the core of the rotating shaft of the sample holder.

[0039] Figure 8 It is a schematic diagram of the adjustment part connection when the radial angle of the specimen is 0°.

[0040] Fig. 9 This is a schematic diagram of the adjustment part connection when the radial angle of the specimen is 45°.

[0041] Fig.10 This is a schematic diagram of the adjustment part connection when the radial angle of the specimen is 90°.

[0042] Figure 1In: 1. Motor, 2. Spindle, 3. Slurry tank, 4. Slurry tank cover, 5. Turntable, 6. Stirring wheel, 7. Sample rack, 7-1. Sample groove, 7-2. Rotating shaft, 7-3. Sample rack connecting arm, 7-4. Bend pipe fixing hole, 8. Connector, 8-1. Clamp shaft, 8-2. Connector connecting arm, 8-3. Connector adjustment slot, 8-4. Threaded hole I, 8-5. Threaded hole II, 8-6. Connector fixing hole, 9. Turntable gasket, 10. Turntable bolt, 11. Fixing bolt, 12. Fixing fastener, 13. Adjusting part, 13-1. Adjusting slot of adjusting part, 13-2. Angle fastener, 13-3. Adjusting slot fastener, 13-4. Angle pointer, 13-5. Sample rack fixing hole, 14. Sample, 15. Angle scale. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0044] See Figure 1-Figure 10 A composite impact angle rotary erosion corrosion test device comprises a stirring mechanism, a sample holder 7, and a connecting member 8. The connecting member 8 is connected to the stirring mechanism. The sample holder 7 is hinged to the connecting member 8. The radial angle between the sample holder 7 and the connecting member 8 can be adjusted. The sample holder 7 itself has a rotating shaft 7-2, which can axially adjust the angle of the sample 14.

[0045] The stirring mechanism includes a motor 1 , a main shaft 2 , a turntable 5 , and a stirring wheel 6 . The motor 1 drives the main shaft 2 to rotate. The turntable 5 and the stirring wheel 6 are respectively fixedly connected to the main shaft 2 . The turntable 5 is connected to the connecting member 8 .

[0046] The connecting member 8 includes a clamping shaft 8-1, a connecting member connecting arm 8-2, a connecting member adjusting groove 8-3, a threaded hole, and a connecting member fixing hole 8-6. The clamping shaft 8-1 is connected to the turntable 5 by a turntable bolt 10. The connecting member connecting arm 8-2 is fixedly connected to the clamping shaft 8-1 or is an integrated structure. The connecting member connecting arm 8-2 is provided with a connecting member fixing hole 8-6, a connecting member adjusting groove 8-3 and a plurality of threaded holes. The connecting member adjusting groove 8-3 is arc-shaped. The connecting member adjusting groove 8-3 and the plurality of threaded holes are on the same arc with the connecting member fixing hole 8-6 as the center. The connecting member fixing hole 8-6 is a hinge axis hole for the sample rack 7 and the connecting member 8.

[0047] The connecting member adjusting groove 8-3 is a 1 / 4 arc, and there are two threaded holes. The central angle between one threaded hole (threaded hole I 8-4) and the line connecting the adjacent ends of the connecting member adjusting groove 8-3 is 45°, and the central angle between the other threaded hole (threaded hole II 8-5) and the line connecting the adjacent ends of the connecting member adjusting groove 8-3 is 90°.

[0048] The sample rack 7 includes a sample groove 7-1, a rotating shaft 7-2, a sample rack connecting arm 7-3, a bend pipe fixing hole 7-4, an adjusting piece 13, and an angle scale 15. A rotating shaft 7-2 is arranged between the sample groove 7-1 and the sample rack connecting arm 7-3. The rotating shaft 7-2 is positioned by tightening a fixing bolt 11. The sample rack connecting arm 7-3 is hinged to the connecting piece 8. The adjusting piece 13 is on the sample rack connecting arm 7-3. The angle scale 15 is on the sample rack connecting arm 7-3. The angle scale 15 corresponds to the adjusting piece 13. The bend pipe fixing holes 7-4 are distributed at the four corners of the sample rack 7, and the bend pipe fixing holes 7-4 are symmetrically arranged.

[0049] The adjusting member 13 includes an adjusting member adjusting groove 13-1, an angle fastener 13-4, an adjusting groove fastener 13-3, and an angle pointer 13-4. The adjusting member adjusting groove 13-1 is an arc, which takes the hinge axis hole of the sample holder 7 and the connecting member 8 as the center and is cocircular with the connecting member adjusting groove 8-3 on the connecting member 8. The angle fastener 13-2 passes through the connecting member adjusting groove 8-3 and the adjusting member adjusting groove 13-1. The adjusting groove fastener 13-3 passes through the connecting member adjusting groove 8-3 (or the connecting member threaded hole I 8-4 or the threaded hole II 8-5) and the adjusting member adjusting groove 13-1. The angle fastener 13-2 and the adjusting groove fastener 13-3 are used for angle adjustment between the sample holder 7 and the connecting member 8. The angle pointer 13-4 is fixed on the angle fastener 13-2. The angle pointer 13-4 corresponds to the angle scale 15.

[0050] The adjusting groove 13 - 1 of the adjusting member is a 1 / 4 arc.

[0051] The stirring mechanism, the sample rack 7 and the connecting piece 8 are in the slurry tank 3 , and a slurry tank cover plate 4 is arranged at the upper end of the slurry tank 3 .

[0052] The experimental sample 14 used in the composite impact angle rotary erosion corrosion test device includes a flat sample and a bent pipe sample (elbow, pipe fitting sample). The flat sample is embedded in the sample frame groove 7-1, and the bent pipe sample is fixed to the sample frame 7 through the bent pipe fixing hole 7-4 with a nylon tie. Due to actual engineering needs, the sample 14 that is the same as the actual working condition component is selected to improve the simulation and scientific nature of the test method.

[0053] The sample holder 7 is connected to the turntable 5 through the connecting piece 8, and the turntable gasket 9 and the turntable bolt 10 are tightened and fixed; the sample holder 7 adjusts the axial angle of the impact surface of the sample 14 through the rotating shaft 7-2 (the sample 14 is parallel to the main axis 2), and the sample assembly (sample holder 7 and connecting piece 8) can adjust the radial angle of the impact surface of the sample 14 (the sample 14 is perpendicular to the main axis 2).

[0054] The clamping shaft 8-1 at one end of the connecting piece 8 is embedded in the turntable 5, and the turntable gasket 9 and the turntable bolt 10 are tightened and fixed; the connecting arm 8-2 at the other end is connected to the sample rack connecting arm 7-3.

[0055] The fixing fastener 12 passes through the sample holder fixing hole 13-5 and the connector fixing hole 8-6.

[0056] The adjusting member 13 has an annular adjusting member adjusting groove 13-1, and the connecting member connecting arm 8-2 corresponding to the adjusting member adjusting groove 13-1 has a connecting member adjusting groove 8-3 and a threaded hole.

[0057] An angle pointer 13 - 4 is arranged on the angle fastener 13 - 2 of the adjusting member 13 , and the angle pointer 13 - 4 points to the center of the fixed fastener 12 . The degree of the angle scale 15 indicated by the angle pointer 13 - 4 is the radial angle of the sample 14 .

[0058] The sample holder connecting arm 7-3 is pasted with an angle ruler, the scale range is 0°~90°, the angle can be accurate to 1°, and can be adjusted arbitrarily within the scale range.

[0059] The sample 14 is divided into a flat sample and a bent pipe sample. The flat sample is embedded in the sample groove 7-1, and the bent pipe sample is pre-drilled at the corresponding position and tied to the bent pipe fixing hole 7-4 by a nylon tie. The rotating shaft 7-2 of the sample frame 7 adjusts the axial angle of the sample 14 and is fixed by the fixing bolt 10.

[0060] The core thread of the rotating shaft 7 - 2 matches the fixing bolt 11 .

[0061] The head of the fixing bolt 10 covers the sample 14 and the sample holder connecting arm 7 - 3 .

[0062] The angle between the bottom edge of the sample groove 7-1 and the sample holder connecting arm 7-3 is the axial angle of the sample 14, and the angle range is 0° to 90°.

[0063] The sample rack 7 and the connecting piece 8 are both made of polytetrafluoroethylene. The connecting piece 8 is a solid structure. The wall thickness of the sample rack connecting arm 7-3 is 3mm to 10mm.

[0064] The connecting arm 8-2 of the connecting piece is designed to be 1 / 4 circular.

[0065] The sample rack connecting arm 7-3 is designed to be 1 / 4 circular.

[0066] like Figure 1As shown, the motor 1 drives the stirring impeller 6 through the main shaft 2 to stir the multiphase fluid in the slurry tank 3 to form a high-speed moving fluid. During operation, the slurry tank cover 4 seals the slurry tank 3. The sample assembly of the rotary erosion corrosion test device includes a sample holder 7 and a connector 8. The connecting member 8 has a clamping shaft 8-1 at one end connected to the turntable 5, and the other end connected to the sample holder 7. The axial angle of the impact surface of the sample 14 is adjusted by the sample holder 7 (the sample 14 is parallel to the main shaft 2), and the radial angle of the impact surface of the sample 14 is adjusted by the sample assembly (sample holder 7 and connector 8) (the sample 14 is perpendicular to the main shaft 2).

[0067] like Figure 2-Figure 5 and Figure 7 As shown, the sample 14 is inserted into the sample groove 7-1, and the axial angle of the sample impact surface is adjusted by the rotating shaft 7-2. The axial angle range is 0° to 90°. The angle between the bottom edge of the sample groove 7-1 and the sample holder connecting arm 7-3 is the sample axial angle, which can be measured with a protractor. The protractor reading is 1°. The core thread of the rotating shaft 7-2 matches the screw of the fixing bolt 11. When the axial angle is determined, tighten it with the fixing bolt 11. The head of the fixing bolt 11 covers the sample 14 and the sample holder connecting arm 7-3. On the one hand, it ensures that the sample 14 does not fly off when the device is running; on the other hand, it keeps the axial angle of the impact surface of the sample 14 unchanged.

[0068] like Figure 3 and Figure 6 As shown, the sample holder 7 and the connector 8 adjust the radial angle of the sample 14. The sample holder connecting arm 7-3 and the connector connecting arm 8-2 are nested, and the fixing fastener 12 passes through the connector fixing hole 8-6 and the sample holder fixing hole 13-5 to connect the two. The radial angle of the sample 14 is determined by using the adjusting groove 13-1 of the adjusting member, the adjusting groove 8-3 of the connecting member, the angle fastener 13-2 and the adjusting groove fastener 13-3. When the radial angle is determined, tighten the fixing fastener 12, the angle fastener 13-2 and the adjusting groove fastener 13-3 to fix at three points. The angle pointer 13-4 points to the center of the fixing fastener 12, and the angle pointer 13-4 indicates the scale value of the angle ruler 15.

[0069] Figure 8-Figure 10 The following is a schematic diagram of the connection of the adjustment parts when the radial impact angles of the sample 14 are set to 0°, 45° and 90° respectively. When the radial angle is 0° to 45°, the adjustment groove fastener 13-3 is placed as shown in the following figure. Figure 8 As shown, the angle fastener 13-2 can be adjusted continuously, the angle pointer 11-4 points to the center of the fastener 12, and the scale of the angle scale 15 is the radial angle value; when the radial angle is 45° to 90°, the adjustment slot fastener 13-3 is placed as shown in Fig. 9 When the radial angle is 90°, the adjustment groove fastener 13-3 is placed as shown in Fig.10 As shown, the rest is the same as above.

[0070] The sample rack connecting arm 7-3 and the connecting rack connecting arm 8-2 are both 1 / 4 circles. The relative rotation of the sample rack connecting arm 7-3 and the connecting rack connecting arm 8-2 realizes the construction of a 0° to 90° radial phase angle of the sample. The 1 / 4 circle design makes the relative rotation of the two unobstructed and can save slurry tank space.

[0071] The sample rack 7 and the connecting rack 8 are fastened at three points using a fixing fastener 12, an angle fastener 13-2 and an adjusting groove fastener 13-3. The isosceles triangle method can be used to simply and accurately adjust the radial angle of the sample. Since the fluid has a great impact on the sample 14 during the high-speed rotation of the flushing process, the principle that the triangle has the strongest supporting force is used, and a three-point fixing method is used to achieve the fastening of the two components.

[0072] The stirring mechanism, the sample rack and the connecting piece are in the slurry tank, and a slurry tank cover is arranged at the upper end of the slurry tank.

[0073] A method for conducting a test using a composite impact angle rotary erosion corrosion test device comprises the following steps:

[0074] 1) Pre-treat the sample, then weigh and record the weight before the test m0, measure the surface area of ​​the sample and record it as S, and collect the morphological information of the sample before the test.

[0075] 2) Insert the connector arm 8-2 into the sample holder connector arm 7-3, and pass the fixing fastener 12 through the connector fixing hole 8-6 and the sample holder fixing hole 13-5. Figure 8 to Figure 10 Select the corresponding installation method, where Figure 8 The radial angle is 0°~45°, Fig. 9 The radial angle is 45°~90°, Fig.10 The radial angle is 90°. Adjust the radial angle of the specimen 14 as required and tighten the fixing fastener 12, angle fastener 13-2 and adjustment slot fastener 13-3. The angle pointer 13-4 on the angle fastener 13-3 points to the center of the fixing fastener 12, and the pointer points to the angle scale 15. The read value is the radial angle value of the specimen 14.

[0076] 3) Fix the sample 14 on the sample holder 7, use 2 to 3 parallel samples to carry out the test, adjust the rotating shaft 7-2 according to the test axial angle requirements, the angle between the bottom edge of the sample groove 7-1 and the sample holder connecting arm 7-3 is the axial angle, measure it with a protractor with a precision of 1°, tighten the fixing bolt 11 to fix the sample 14 and the axial angle.

[0077] 4) The sample assembly (sample rack 7 and connecting rack 8) carrying the sample 14 is embedded in the turntable 5, and the turntable gasket 9 and turntable bolts 10 are tightened to fix the sample assembly.

[0078] 5) Select the actual working environment fluid, or configure the corresponding simulation fluid or accelerated test fluid in the laboratory;

[0079] 6) Inject the test fluid into the slurry tank 3; if there is a solid phase, add sand and gravel into the slurry tank 3, and control the strength of the sand and gravel to 350μm~400μm.

[0080] 7) Adjust the flow rate, start the motor 1 to rotate the turntable 5 and the stirring blade 6, and record the test start time t1.

[0081] 8) Record the test end time t2, take out the sample 14, and observe and collect the morphological information of the sample after the test.

[0082] 9) Clean the sample, weigh it and record the weight m after the test, and use the weight loss method to calculate the corrosion rate of the material.

[0083] Embodiment 1:

[0084] See also Figure 1-Figure 8 Taking a flat plate sample with an axial angle of 45° and a radial angle of 0° as an example, a test method of a composite impact angle rotary erosion corrosion test device of the present invention is described, comprising the following steps:

[0085] (1) The flat specimen with the size of 20 mm × 20 mm × 5 mm was machined to make the working surface smoothness reach Grade 8, degreased with acetone, dried with cold air, and then weighed and the weight before the test m0 was recorded. The surface area of ​​the specimen was measured and recorded as S, and the morphology of the specimen before the test was collected;

[0086] (2) Insert the connector arm 8-2 into the sample rack connector arm 7-3, pass the fixing fastener 12 through the connector fixing hole 8-6 and the sample rack fixing hole 13-5, and adjust the slot fastener 13-3 as shown in FIG. Figure 8 Position installation, the angle fastener 13-2 is fixed when the angle pointer 13-4 points to the center of the fixed fastener 12 and the angle scale 15 is at 0°, and the three components are tightened.

[0087] (3) Install the three parallel plate specimens in the specimen groove 7-1, adjust the rotating shaft 7-2 so that the angle between the bottom edge of the specimen groove 7-1 and the specimen holder connecting arm 7-3 reaches 45°, and calibrate with a protractor. Tighten the fixing bolt 11.

[0088] (4) The sample assembly carrying the flat sample is inserted into the turntable 5, the clamping shaft 8-1 is completely immersed, and the turntable gasket 9 and the turntable bolt 10 are tightened to further fix the sample assembly.

[0089] (5) Select the actual working environment fluid, or configure the corresponding simulation fluid or accelerated test fluid in the laboratory;

[0090] (6) Adjust the flow rate, start the motor 1 to rotate the turntable 5 and the stirring blade 6, and record the test start time t1.

[0091] (7) Record the test end time t2, take out the flat sample 14, and observe and collect the sample morphology information after the test.

[0092] (8) Clean the sample 14, weigh it and record the weight m after the test, and calculate the corrosion rate of the material using the weight loss method.

[0093] Embodiment 2:

[0094] See also Figure 1-Figure 8 Taking the bent pipe sample with an axial angle of 45° and a radial angle of 45° as an example, the test method of the composite impact angle rotary erosion corrosion test device of the present invention is described, comprising the following steps:

[0095] (1) The bent pipe sample is prepared by cutting the elbow or pipe fitting along the center line. The target research position on the inner side of the bent pipe is on the longitudinal center axis of the bent pipe fixing hole. A pre-drilled hole is made on the bent pipe sample relative to the bent pipe fixing hole position 7-4 of the sample holder 7. The bent pipe sample is processed to a length of 20 mm and a width that is the cross-sectional width of the bent pipe. It is degreased with acetone and dried with cold air. Then, it is weighed and the weight before the test is recorded as m0. The surface area of ​​the sample is measured and recorded as S. The morphology of the sample before the test is collected.

[0096] (2) Insert the connector arm 8-2 into the sample rack connector arm 7-3, pass the fixing fastener 12 through the connector fixing hole 8-6 and the sample rack fixing hole 13-5, and adjust the slot fastener 13-3 as shown in FIG. Fig. 9 Position installation, the angle fastener 13-2 is fixed at the 45° position when the angle pointer 13-4 points to the center of the fixed fastener 12 and the angle scale 15, and the three components are tightened.

[0097] (3) Use nylon tie to pass through the corresponding drilled hole of the bent pipe specimen and the bent pipe fixing hole 7-4, tie it tightly, and fix it at four points. Install the three parallel bent pipe specimens on the specimen groove 7-1, adjust the rotating shaft 7-2 so that the angle between the bottom edge of the specimen groove 7-1 and the specimen holder connecting arm 7-3 reaches 45°, calibrate it with a protractor, and tighten the fixing bolt 11.

[0098] (4) The sample assembly carrying the sample is inserted into the turntable 5, the clamping shaft 8-1 is completely immersed, and the turntable gasket 9 and the turntable bolt 10 are tightened to further fix the sample assembly.

[0099] (5) Select the actual working environment fluid, or configure the corresponding simulation fluid or accelerated test fluid in the laboratory;

[0100] (6) Adjust the flow rate, start the motor 1 to rotate the turntable 5 and the stirring blade 6, and record the test start time t1.

[0101] (7) Record the test end time t2, take out the bent pipe sample, and observe and collect the sample morphology information after the test.

[0102] (8) Clean the sample, weigh it and record the weight m after the test, and use the weight loss method to calculate the corrosion rate of the material.

[0103] See also Figure 1-Figure 7 and Fig. 9 , Fig.10 , other composite impact angle adjustment methods are the same as those in the embodiment.

Claims

1. A composite impact angle rotary erosion corrosion test device, characterized in that: It includes a stirring mechanism, a sample rack and a connecting piece, wherein the connecting piece is connected to the stirring mechanism, the sample rack is hinged to the connecting piece, the radial angle between the sample rack and the connecting piece can be adjusted, and the sample rack itself has a rotating shaft, which can axially adjust the sample angle; The connecting piece comprises a clamping shaft, a connecting piece connecting arm, a connecting piece adjusting groove, a threaded hole and a connecting piece fixing hole. The clamping shaft is connected to the turntable by a turntable bolt. The connecting piece connecting arm is fixedly connected to the clamping shaft as an integral structure. The connecting piece connecting arm is provided with a connecting piece fixing hole, a connecting piece adjusting groove and a plurality of threaded holes. The connecting piece adjusting groove is arc-shaped. The connecting piece adjusting groove and the plurality of threaded holes are on the same arc with the connecting piece fixing hole as the center. The connecting piece fixing hole is a hinged shaft hole between the sample holder and the connecting piece. The sample rack comprises a sample groove, a rotating shaft, a sample rack connecting arm, a bend pipe fixing hole, an adjusting piece and an angle scale. A rotating shaft is arranged between the sample groove and the sample rack connecting arm, and the rotating shaft is positioned by tightening a fixing bolt. The sample rack connecting arm is hinged to the connecting piece, the adjusting piece is on the sample rack connecting arm, the angle scale is on the sample rack connecting arm, the angle scale corresponds to the adjusting piece, and the bend pipe fixing holes are distributed at the four corners of the sample rack, and the bend pipe fixing holes are symmetrically arranged. The adjusting member comprises an adjusting member adjusting groove, an angle fastener, an adjusting groove fastener and an angle pointer. The adjusting member adjusting groove is an arc. The arc of the adjusting member adjusting groove takes the hinge shaft hole between the sample holder and the connecting member as the center and is cocircular with the connecting member adjusting groove on the connecting member. The angle fastener passes through the connecting member adjusting groove and the adjusting member adjusting groove. The adjusting groove fastener passes through the connecting member adjusting groove or the threaded hole on the connecting member and the adjusting member adjusting groove. The angle fastener and the adjusting groove fastener are used for angle adjustment between the sample holder and the connecting member. The angle pointer is fixed on the angle fastener. The angle pointer corresponds to the angle scale.

2. A composite impact angle rotary erosion corrosion test device according to claim 1, characterized in that: The stirring mechanism comprises a motor, a main shaft, a turntable and a stirring wheel. The motor drives the main shaft to rotate. The turntable and the stirring wheel are respectively fixedly connected to the main shaft. The turntable is connected to the connecting piece.

3. The composite impact angle rotary erosion corrosion test device according to claim 1, characterized in that: The connecting piece adjustment groove is a 1 / 4 arc, and there are two threaded holes. The center angle of the line connecting one threaded hole and the adjacent end of the connecting piece adjustment groove is 45°, and the center angle of the line connecting the other threaded hole and the adjacent end of the connecting piece adjustment groove is 90°.

4. The composite impact angle rotary erosion corrosion test device according to claim 1, characterized in that: The adjusting groove of the adjusting member is a 1 / 4 arc.

5. The composite impact angle rotary erosion corrosion test device according to claim 1, characterized in that: The stirring mechanism, the sample rack and the connecting piece are in the slurry tank, and a slurry tank cover is arranged at the upper end of the slurry tank.

6. A method for conducting a test using the composite impact angle rotary erosion corrosion test device as described in any one of claims 1 to 5, characterized in that: The steps include: 1) Pre-treat the sample, then weigh and record the weight before the test m0, measure the surface area of ​​the sample and record it as S, and collect the morphological information of the sample before the test; 2) Insert the connecting arm of the connector into the connecting arm of the specimen holder, and pass the fixing fastener through the fixing hole of the connector and the fixing hole of the specimen holder. According to the radial angle requirements of the test, adjust the radial angle of the specimen holder and tighten the fixing fastener, angle fastener and adjustment slot fastener. The angle pointer on the angle fastener points to the center of the fixing fastener, and the pointer points to the angle scale. The read value is the angle value of the specimen diameter. 3) Fix the specimen on the specimen holder, use 2 to 3 parallel specimens to carry out the test, adjust the rotation axis according to the test axial angle requirements, the angle between the bottom edge of the specimen groove and the connecting arm of the specimen holder is the axial angle, measure it with a protractor, tighten the fixing bolts to fix the specimen and axial angle; 4) Insert the sample rack and connectors carrying the sample into the turntable and tighten them with turntable gaskets and turntable bolts; 5) Select the actual working environment fluid, or configure the corresponding simulated fluid in the laboratory; 6) Inject the test fluid into the slurry tank; if there is a solid phase, add sand and gravel into the slurry tank, and the sand and gravel particle size is controlled at 350μm~400μm; 7) Adjust the flow rate, start the motor to rotate the turntable and stirring blades, and record the test start time t1; 8) Record the test end time t2, take out the sample, observe and collect the sample morphology information after the test; 9) Clean the sample, weigh it and record the weight m after the test, and use the weight loss method to calculate the corrosion rate of the sample material.

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