Integrated monitoring device for service state of material in pipeline under working condition of high-pressure flow velocity

Abstract

The invention relates to an integrated monitoring device for the service state of a material in a pipeline under the working condition of high-pressure flow velocity, which comprises an electrochemical in-situ monitoring system and a placing system for a weightlessness sample and an adhesive force test sample, and in order to achieve safety, a pipeline external protective sleeve is additionally arranged outside the three systems. The electrochemical in-situ monitoring system mainly comprises a solid-state temperature-resistant and pressure-resistant reference electrode, a pressure sealing gasket, a counter electrode and an electrochemical pipeline main body; the weightless sample placing system mainly comprises a lock tenon part, an additional lock ring and a lock pipe; the adhesive force test sample placing system mainly comprises an adhesive force sealing cover and an adhesive force pipeline main body; the morphology sample placing system mainly comprises a morphology observation sealing cover and a morphology observation pipeline main body; the pipeline external protective sleeve system mainly comprises an external protective sleeve pipeline main body and a sealing screw. According to the invention, electrochemical in-situ measurement, material weightlessness measurement and measurement of material interlayer binding force and adhesive force in a high-flow-velocity and high-pressure environment can be met.

Description

Technical Field

[0001] The present invention belongs to the technical field of integrated monitoring of the service state of metal systems or metal coating systems under pressure environments in marine and chemical industries, and specifically relates to an integrated monitoring device for the service state of materials in pipelines under high-pressure flow rate working conditions. Background Art

[0002] Corrosion is one of the basic forms of material failure. There are many types of corrosion, which can be divided into atmospheric corrosion, marine corrosion, soil corrosion, etc. according to different environments. The economic losses caused by corrosion are high, and the most important type of corrosion is marine corrosion. The marine environment is complex and diverse. Environmental factors such as temperature, humidity, pH value, pressure, and flow rate are important factors causing material corrosion. Studying the corrosion mechanism of materials in the marine environment is of great significance for material protection, material selection, and alloy design.

[0003] Under the current economic development conditions, the study of material failure mechanisms under marine environmental conditions is the key to solving ocean-related problems. Real-time marine environmental monitoring is a reliable research method; however, monitoring under natural conditions is very labor-intensive and resource-intensive, and it usually takes several months to several years to monitor the failure of materials; therefore, by simulating marine environmental conditions indoors, monitoring material performance is better than real-time monitoring.

[0004] In the process of studying and monitoring material failure, electrochemical measurement is one of the most important means. The corrosion mechanism of the material can be studied and inferred through the relevant electrochemical measurement data. In the current research progress, the in-situ monitoring of the electrochemical changes of the material can more accurately determine the failure mechanism of the material. In addition, monitoring the weight loss of the sample can obtain important data for determining the failure of the material. It is the most reliable method for determining metal corrosion or material damage in the experiment. In order to meet the current research environment and fix the material system, the system structure needs to be adjusted accordingly.

[0005] When studying metal coating systems, real-time monitoring of adhesion is also the main means of measuring coating failure. The time and failure mechanism of coating failure can be inferred by monitoring the changes in adhesion. In the current research progress, real-time monitoring of changes in adhesion can more accurately analyze the failure of the coating. In order to match the experimental equipment, the structure of the adhesion test sample placement system should be adjusted. Summary of the invention

[0006] The present invention provides an integrated monitoring device for the service state of materials in a pipeline under high-pressure flow rate working conditions. The specific technical scheme is as follows:

[0007] An integrated monitoring device for the service state of materials in a pipeline under high-pressure flow rate working conditions, comprising an electrochemical in-situ monitoring system, a weightlessness sample placement system, an adhesion test sample placement system and a pipeline external protective cover system;

[0008] The electrochemical in-situ monitoring system comprises a working electrode, a counter electrode, a counter electrode compression gasket, an electrochemical internal pipeline, an external pipeline and an external locking cover; the external pipeline is divided into an external sealing pipeline a and an external sealing pipeline b, the external pipeline is spliced ​​and sleeved on the outside of the electrochemical internal pipeline, and the three are combined into one pipeline by an external locking cover;

[0009] The weightlessness sample placement system comprises a weightlessness sample, a weightlessness pipe locking tenon part a, a weightlessness pipe locking tenon part b and a weightlessness pipe external locking ring; the weightlessness sample is a long strip structure, connected with the weightlessness pipe locking tenon part a and the weightlessness pipe locking tenon part b on the left and right to form a ring structure, and the weightlessness pipe external locking rings are reinforced at the front and rear ends to form a pipe;

[0010] The adhesion test sample placement system comprises an adhesion sample, an adhesion placement main pipe and an adhesion pipe cover; a groove is provided on the inner wall of the adhesion placement main pipe, and the adhesion sample a and the adhesion sample b are plate-like structures, which are inserted into the adhesion placement main pipe along the groove, and the adhesion pipe cover is reinforced at both ends of the adhesion placement main pipe with screws to form a tubular structure;

[0011] The pipeline external protection cover system comprises an external pipeline protection cover body, an external pipeline protection cover cover, a working electrode sealing plate and a counter electrode sealing plate; the external pipeline protection cover body is an external cylindrical structure, and the working electrode placement place and the reference electrode placement place are correspondingly arranged on the outer wall of the opening on one side of the external pipeline protection cover body; the counter electrode placement place is arranged on the same side as the working electrode placement place;

[0012] The electrochemical in-situ monitoring device system, the weightlessness sample placement system, and the adhesion sample placement system are sequentially connected and inserted into the external pipe protection sleeve body; and external pipe protection sleeve covers are provided at both ends of the external pipe protection sleeve body, and connected to other pipes through screws and washers;

[0013] The working electrode is fixed at the working electrode placement, the counter electrode is fixed at the counter electrode placement, and the reference electrode placement is used to place the reference electrode. The working electrode, the counter electrode, and the reference electrode are electrically connected to the outside world through leads;

[0014] The working electrode sealing plate and the counter electrode sealing plate are installed on the working electrode placement position and the counter electrode placement position respectively.

[0015] The integrated monitoring device for the service status of materials in a pipeline under high-pressure flow rate working conditions has a preferred embodiment in which the number of working electrodes and weightlessness samples placed is set according to the size of the pipeline.

[0016] The integrated monitoring device for the service status of materials in a pipeline under high-pressure flow rate working conditions is preferably configured such that the working electrode in the electrochemical in-situ monitoring system is the material to be monitored, and the material to be monitored is a metal or a coating material; the counter electrode is a semicircular platinum sheet as the material; and the reference electrode is an Ag / AgCl withstand voltage electrode.

[0017] The integrated monitoring device for the service status of materials in pipelines under high-pressure flow rate working conditions is preferably configured such that the integrated monitoring device can ensure that the sample is fixed within any adjustable parameter range of 0MPa-10MPa liquid pressure / gas pressure and 0m / s-15m / s flow rate and ensure the simulation of the fluid pressure working environment.

[0018] The integrated monitoring device for the service status of materials in a pipeline under high-pressure flow rate conditions is preferably configured such that the working electrode in the electrochemical in-situ monitoring system can realize in-situ electrochemical measurement through an external electrochemical workstation; the weightlessness sample placement system is constructed with a mortise and tenon structure, which is convenient for installation and disassembly to measure the weightlessness of materials.

[0019] The integrated monitoring device for the service status of materials in pipelines under high-pressure flow rate conditions is preferably designed such that the adhesion test sample placement system meets the fluid flushing environment conditions, and the adhesion pipeline cover end is designed as a trapezoidal structure, which can quickly disperse and bundle the water flow at the front and rear ends of the external pipeline protective cover body to achieve a state in which the fluid completely flushes the surface.

[0020] The integrated monitoring device for the service status of materials in a pipeline under high-pressure flow rate working conditions has a preferred embodiment in which the number of the adhesion samples a and the adhesion samples b is set according to the size of the pipeline body in the adhesion test sample placement system.

[0021] The integrated monitoring device for the service status of materials in a pipeline under high-pressure flow rate working conditions is preferably configured such that the external pipeline protection sleeve main body, the external pipeline protection sleeve cover, the working electrode sealing plate, and the counter electrode sealing plate are all made of 316L stainless steel; the weightless pipeline locking tenon part a, the weightless pipeline external locking ring, and the weightless pipeline locking tenon part b are all made of nylon; the weightless sample can be made of any material, and the rest are made of polytetrafluoroethylene.

[0022] The integrated monitoring device for the service status of materials in a pipeline under high-pressure flow rate conditions is preferably configured such that the counter electrode is a platinum sheet with a platinum wire welded near the center of the platinum sheet, the platinum sheet is bent into a semicircle, and the welded platinum wire is completely covered by a heat shrink tube.

[0023] The specific use and construction operations of an integrated monitoring device for the service status of materials in a pipeline under high-pressure flow rate conditions are as follows:

[0024] First, three types of samples need to be prepared, namely the working electrode, weightlessness sample, and adhesion sample. Their structures are inconsistent and need to be prepared accordingly.

[0025] The diameter of the current equipment pipeline in service environment is 25mm. To meet the experimental conditions, the following size samples are designed.

[0026] Preparation of working electrode: To ensure that the sample can meet the fluid pressure coupling environment and be well sealed when placed in the pipeline, the electrochemical sample is designed as a convex structure with a bottom circular diameter of 12mm and a height of 1mm, and an upper circular diameter of 15mm and a height of 1mm. A working electrode material with a certain diameter and a thickness of 1mm is selected, and a copper wire with a diameter of 1mm and a length greater than 100mm is used for welding at the center point. A 2mm heat shrink tube with a length greater than 50mm is used to completely cover the welding copper wire, and AB glue is used to encapsulate it into the required working electrode;

[0027] Preparation of weight loss samples: When measuring the weight loss of materials, the surface of the materials should be washed by the fluid but not washed away, and the sealing should be good. Metal materials or non-materials can be cut into thin slice weight loss samples of 70mm×9mm×0.2mm;

[0028] Preparation of adhesion samples: When the coating material is tested for adhesion, a 10mm aluminum ingot needs to be adhered to the surface of the material, and the surface fluid scouring and pressure environment needs to be met. A metal material with a certain size and thickness of 1mm is selected as the substrate, and AB glue is used to encapsulate it into an adhesion sample. The sizes of the two encapsulated samples are 50mm×30mm×1mm adhesion sample a and 50mm×26mm×1mm adhesion sample b;

[0029] The counter electrode needs to be prepared in advance for installation. The counter electrode is made of platinum sheet and can be used for a long time without replacement. A platinum wire with a diameter of 0.8mm and a length greater than 100mm is welded near the center of the 530mm×3mm×1mm platinum sheet. The platinum sheet is bent into a semicircle and a heat shrink tube with a length greater than 50mm and a diameter of 1.2mm is used to completely cover the welded platinum wire.

[0030] Assemble three sample systems: first assemble the weightlessness sample placement system and the adhesion test sample placement system, and finally assemble the electrochemical in-situ monitoring system and the overall system.

[0031] Assemble the weightlessness sample placement system: insert the prepared weightlessness sample into the weightlessness pipe locking tenon part a and the weightlessness pipe locking tenon part b, intersect and fix them in a circular order, and buckle the weightlessness pipe with a locking ring in front and behind the pipe;

[0032] Assemble the adhesion test sample placement system: insert the prepared adhesion sample a and adhesion sample b into the adhesion placement main pipe, cover the two ends with adhesion covers, and tighten the M5 hexagon socket screws at the eight holes.

[0033] Preassemble the electrochemical in-situ monitoring system: first, buckle the prepared counter electrode on one side of the electrochemical internal pipe, pass the coated platinum wire through the counter electrode pressure sealing gasket and the external sealing pipe b on the counter electrode side in turn and buckle it on one side of the surface of the electrochemical internal pipe, buckle the external sealing pipe a on the working electrode and reference electrode sides on the other side of the electrochemical internal pipe surface and align it with the external sealing pipe b, and then seal the front and back sides of the electrochemical external pipe with the electrochemical external locking cover.

[0034] Assemble the overall system: insert the pre-assembled electrochemical in-situ monitoring system into the predetermined position on one side of the external pipe protective cover, then pass the counter electrode sealing plate through the coated platinum wire and tighten it at the two holes with M5 hexagon socket screws, then place the previously assembled weightlessness sample placement system and adhesion test sample placement system into the pipe external protective cover in turn, finally cover the front and rear sides of the pipe with the external pipe protective cover and tighten it at the eight front and rear holes with M10 hexagon socket screws.

[0035] Post-assembly of the electrochemical measurement system: first, place the prepared working electrode in the working electrode placement position, then pass the welded and coated copper wire through the working electrode sealing gasket and the working electrode sealing plate in turn and fix and compress the electrochemical sample, then tighten the M5 hexagon socket screws at the four holes on the working electrode sealing plate, and finally fix the Ag / AgCl withstand voltage electrode in the high-voltage and high-temperature reference electrode placement position.

[0036] Beneficial Effects

[0037] The present invention has a simple structure, convenient installation, and good sealing performance. It can be used in circulation simulation equipment, petrochemical pipelines and other devices to monitor the coating system or material system in an integrated manner, and has strong versatility. The design of the three-electrode system in the electrochemical in-situ monitoring system can be well adapted to the simulation and in-situ electrochemical measurement in the deep-sea high-velocity and high-pressure environment. The measurement data is more accurate and more in line with the rules of electrochemical measurement; the design of the weightlessness sample placement system can be well fixed in the equipment system, and the design of the mortise and tenon structure can facilitate the disassembly of the parts in the weightlessness measurement system, and it is very convenient to measure the weightlessness of the material; the design of the adhesion sample placement system can well meet the deep-sea high-velocity and high-pressure environment, and can measure more adhesion data at one time, and the design structure can be better adapted to the experimental conditions. The present invention meets the requirements of testing the sealing performance of the high-pressure and high-velocity environment and the resolution of the electrochemical test, and can also meet the material weightlessness test and coating adhesion measurement in the high-pressure and high-velocity environment. It can be used for the study of coating failure mechanism and the service state detection and evaluation of metal materials and the study of failure mechanism in the deep-sea high-velocity and high-pressure environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is the overall structure of the pipeline monitoring system;

[0039] Figure 2 Assemble the structure diagram for the electrochemical in-situ monitoring system;

[0040] Figure 3 Assemble the structure diagram for the weightless sample placement system;

[0041] Figure 4 Assembly diagram of the system for placing samples for adhesion testing;

[0042] Figure 5 Assembling structure diagram of pipe protection cover system;

[0043] Figure 6 It is the left side cross-sectional view of the weightlessness sample placement system;

[0044] Figure 7 It is a schematic diagram of the funnel-shaped structure of the adhesion pipeline cover;

[0045] Figure 8 The Nyquist plots of the electrochemical impedance spectroscopy of Q235 steel coated with epoxy coating at different times under the conditions of pressure 5MPa and flow rate 3m / s;

[0046] Fig. 9 The Bode graph of the electrochemical impedance spectroscopy of Q235 steel coated with epoxy coating at different times under the conditions of pressure 5MPa and flow rate 3m / s;

[0047] Fig.10Comparison curve of the adhesion of the coating on the Q235 surface after three days of service at different flow rates of 1m / s, 3m / s, 6m / s and 8m / s under a pressure of 5MPa;

[0048] Fig.11 This is the water absorption curve of pure epoxy resin free film under pressure of 5MPa and different flow rates of 1m / s, 3m / s, 6m / s and 8m / s.

[0049] Among them, 1 is the electrochemical in-situ monitoring system, 2 is the weightlessness sample placement system, 3 is the adhesion pipeline, 4 is the pipeline external protective sleeve system, 5 is the counter electrode, 6 is the counter electrode pressure sealing gasket, 7 is the working electrode pressure sealing gasket, 8 is the external sealing pipeline a, 9 is the external sealing pipeline b, 10 is the electrochemical internal pipeline, 11 is the external locking cover, 12 is the working electrode, 13 is the weightlessness pipeline lock tenon part a, 14 is the weightlessness sample, 15 is the weightlessness pipeline external locking ring, 16 is the weightlessness pipeline lock tenon part b, 17 is the adhesion placement main pipeline, 18 is the adhesion sample a, 19 is the adhesion pipeline sealing cover; 20 is the external pipeline protective sleeve body, 21 is the external pipeline protective sleeve sealing cover, 22 is the working electrode sealing plate, 23 is the counter electrode sealing plate, 24 is the working electrode placement, 25 is the reference electrode placement, 26 is the counter electrode placement, and 27 is the adhesion sample b. DETAILED DESCRIPTION

[0050] The invention is further described below in conjunction with the accompanying drawings of the present invention, but it should not be understood that the above subject scope of the present invention is limited to the following embodiments. Without departing from the above ideas of the present invention, various substitutions and changes are made according to common technical knowledge and customary means in the art, which should all be included in the protection scope of the present invention.

[0051] like Figure 1-11 As shown, an integrated monitoring device for the service state of materials in a pipeline under high-pressure flow rate working conditions comprises an electrochemical in-situ monitoring system 1, a weightlessness sample placement system 2, an adhesion test sample placement system 3 and a pipeline external protective cover system 4;

[0052] The electrochemical in-situ monitoring system 1 comprises a working electrode 12, a counter electrode 5, a counter electrode compression gasket 6, an electrochemical internal pipeline 10, an external pipeline and an external locking cover 11; the external pipeline is divided into an external sealing pipeline a8 and an external sealing pipeline b9, and the external pipeline is spliced ​​and sleeved on the outside of the electrochemical internal pipeline 10, and the three are combined into one pipeline by the external locking cover 11;

[0053] The weightlessness sample placement system 2 includes a weightlessness sample 14, a weightlessness pipe locking tenon part a13, a weightlessness pipe locking tenon part b16 and a weightlessness pipe external locking ring 15; the weightlessness sample 14 is a long strip structure, connected with the weightlessness pipe locking tenon part a13 and the weightlessness pipe locking tenon part b16 on the left and right to form a ring structure, and the weightlessness pipe external locking ring 15 is reinforced at the front and rear ends to form a pipe;

[0054] The adhesion test sample placement system 3 includes an adhesion sample a18, an adhesion sample b27, an adhesion placement main pipe 17 and an adhesion pipe cover 19; a groove is provided on the inner wall of the adhesion placement main pipe 17, and the adhesion samples a18 and the adhesion samples b27 are both plate-like structures, which are inserted into the adhesion placement main pipe 17 along the groove, and the adhesion pipe cover 19 is reinforced at both ends of the adhesion placement main pipe 17 with screws to form a tubular structure;

[0055] The pipeline external protection cover system 4 includes an external pipeline protection cover body 20, an external pipeline protection cover cover 21, a working electrode sealing plate 22 and a counter electrode sealing plate 23; the external pipeline protection cover body 20 is an external cylindrical structure, and the working electrode placement 24 and the reference electrode placement 25 are correspondingly arranged on the outer wall of the opening on one side of the external pipeline protection cover body 20; the counter electrode placement 26 is arranged on the same side as the working electrode placement 24;

[0056] The electrochemical in-situ monitoring device system 1, the weightlessness sample placement system 2, and the adhesion sample placement system 3 are sequentially connected and inserted into the external pipe protection cover body 20; and the external pipe protection cover covers 21 are arranged at both ends of the external pipe protection cover body 20 and connected to other pipes through screws and washers;

[0057] The working electrode 12 is fixed at the working electrode placement 24, the counter electrode 5 is fixed at the counter electrode placement 26, and the reference electrode placement 25 is used to place the reference electrode. The working electrode 12, the counter electrode 5, and the reference electrode are electrically connected to the outside world through leads;

[0058] The working electrode sealing plate 22 and the counter electrode sealing plate 23 are installed on the working electrode placement location 24 and the counter electrode placement location 26 respectively.

[0059] The number of the working electrodes 12 and the weightlessness samples 14 placed is set according to the different sizes of the pipelines.

[0060] The working electrode 12 in the electrochemical in-situ monitoring system 1 is the material to be monitored, which is a metal or a coating material; the counter electrode 5 is made of a semicircular platinum sheet; and the reference electrode is a Ag / AgCl withstand voltage electrode.

[0061] The integrated monitoring device can ensure that the sample is fixed within any adjustable parameter range under the conditions of 0MPa-10MPa liquid pressure / gas pressure and 0m / s-15m / s flow rate and ensure the simulated fluid pressure working environment.

[0062] The working electrode 12 in the electrochemical in-situ monitoring system 1 can realize in-situ electrochemical measurement through an external electrochemical workstation; the weightlessness sample placement system 2 is constructed with a mortise and tenon structure, which is convenient for installation and disassembly to measure the weightlessness of materials.

[0063] In order to meet the fluid flushing environment conditions, the adhesion test sample placement system 3 has a trapezoidal structure at the end of the adhesion pipe cover 19, which can quickly disperse and bundle the water flow at the front and rear ends of the external pipe protection cover body 20 to achieve a state where the fluid completely flushes the surface.

[0064] The number of the adhesion samples a18 and the adhesion samples b27 is set according to the size of the pipe body in the adhesion test sample placement system 3 .

[0065] The external pipe protection sleeve body 20, the external pipe protection sleeve cover 21, the working electrode sealing plate 22, and the counter electrode sealing plate 23 are all made of 316L stainless steel; the weightless pipe locking tenon part a13, the weightless pipe external locking ring 15, and the weightless pipe locking tenon part b16 are all made of nylon; the weightless sample 14 can be made of any material, and the rest are made of polytetrafluoroethylene.

[0066] The counter electrode 5 is made of a platinum sheet, with a platinum wire welded near the center of the platinum sheet. The platinum sheet is bent into a semicircular shape, and the welded platinum wire is completely covered with a heat shrink tube.

[0067] The working electrode used in the following examples is a metal material coated with a 200 μm coating, and the experiments were carried out in simulated seawater containing 3.5 wt % NaCl.

[0068] Example 1

[0069] In this example, Q235 steel with a diameter of 10 mm is used as the base material and epoxy resin is used as the coating material. The electrochemical sample is first welded and packaged. Figure 2 As shown, the corresponding working electrode 12 is prepared, the surface of Q235 steel is polished with 240# sandpaper, the surface is cleaned with deionized water and anhydrous ethanol and dried, and then epoxy resin is prepared to brush a 200μm thick coating, which is cured at 40°C for 2h, 60°C for 12h, and room temperature for 7d. The test solution is simulated seawater with 3.5wt% NaCl, the test temperature is 20°C, the test pressure is 5MPa, the flow rate is 3m / s, and a deep sea simulation is carried out for 96h, and electrochemical impedance is measured at the corresponding time nodes 0h, 24h, 72h, and 96h.

[0070] The test results are as follows Figure 2 As shown, from Figure 8 It can be seen that under the conditions of pressure 5MPa and flow rate 3m / s, the Nyquist plot of the electrochemical impedance spectrum of Q235 steel coated with epoxy resin shows that the impedance value gradually decreases with the passage of time, indicating that the surface of the sample is damaged during service; the capacitive reactance arc gradually decreases, indicating that water is rapidly immersing into the coating, which is consistent with the experimental law. Fig. 9 It can be seen that the Bode diagram of the electrochemical impedance spectrum of Q235 steel coated with epoxy resin coating at different times also shows that the impedance modulus gradually decreases with the extension of the test time, indicating that with the extension of service time, the surface of the material is damaged, and the decline is slow in the early stage, and the damage is relatively light; the decline is rapid in the later stage, and the damage is more serious.

[0071] Implementation Case 2

[0072] In this example, 46mm×26mm×1mm and 46mm×24mm×1mm Q235 steel are used as the base material, and epoxy resin is used as the coating material. First, prepare the corresponding service samples and perform the corresponding sample packaging, such as Figure 2 As shown, the adhesion samples a18 and b27 were polished on both sides of the Q235 steel with 240# sandpaper, cleaned and dried with deionized water and anhydrous ethanol, and coated with a 200μm thick epoxy resin, which was cured at 40℃ for 2h, 60℃ for 12h, and room temperature for 7d; the epoxy resin was coated on a silicone plate with a thickness of 200μm, cured at 40℃ for 2h, 60℃ for 12h, and room temperature for 7d, and after complete curing, it was cut into free film samples of 70mm×9mm×0.2mm, as shown in FIG. Figure 2 As shown, the test solution of the weightless sample 14 is 3.5wt% NaCl simulated seawater, the test temperature is 20°C, the test pressure is 5MPa, the flow rates are 1m / s, 3m / s, 6m / s, and 8m / s, respectively, and a 10d water absorption test and a 3d adhesion test are performed.

[0073] The results are as follows: Fig.11 As shown, from Fig.10 It can be seen that the adhesion of Q235 steel coated with epoxy resin coating under the same pressure and different flow rate conditions is lower than that before immersion. This is because the coating on the surface of the material is damaged by the combined effect of pressure and fluid, allowing the solution to quickly enter the coating. At the same time, it can also be observed that the adhesion decreases with the increase of flow rate, indicating that under the pressure and flow rate coupling conditions, water is accelerated to penetrate into the coating, causing the interface between the coating and the substrate to peel off. Fig.11It can be seen that under the conditions of the same pressure and different flow rates, the saturated water absorption rate of the epoxy resin free film increases with the increase of flow rate, indicating that the degradation rate of the coating itself due to water is accelerated; and the initial growth rate gradually accelerates with the increase of flow rate, indicating that as the flow rate increases, the speed at which the solution enters the resin itself is accelerated, causing higher damage to the coating itself.

Claims

1. An integrated monitoring device for the service status of materials in a pipeline under high pressure and flow rate conditions, characterized in that: It includes an electrochemical in-situ monitoring system (1), a weightlessness sample placement system (2), an adhesion test sample placement system (3) and a pipeline external protection cover system (4); The electrochemical in-situ monitoring system (1) comprises a working electrode (12), a counter electrode (5), a counter electrode compression gasket (6), an electrochemical internal pipeline (10), an external pipeline and an external locking cover (11); the external pipeline is divided into an external sealing pipeline a (8) and an external sealing pipeline b (9); the external pipeline is spliced ​​and sleeved on the outside of the electrochemical internal pipeline (10), and the three are combined into one pipeline by the external locking cover (11); The weightlessness sample placement system (2) comprises a weightlessness sample (14), a weightlessness pipe locking tenon part a (13), a weightlessness pipe locking tenon part b (16) and a weightlessness pipe external locking ring (15); the weightlessness sample (14) is a long strip structure, connected with the weightlessness pipe locking tenon part a (13) and the weightlessness pipe locking tenon part b (16) on the left and right to form a ring structure, and the weightlessness pipe external locking ring (15) is reinforced at the front and rear ends to form a pipe; The adhesion test sample placement system (3) comprises an adhesion sample (18), an adhesion placement main pipe (17) and an adhesion pipe cover (19); a groove is provided on the inner wall of the adhesion placement main pipe (17); the adhesion sample (18) is a plate-like structure and is inserted into the adhesion placement main pipe (17) along the groove, and the adhesion pipe cover (19) is reinforced at both ends of the adhesion placement main pipe (17) using screws to form a tubular structure; The pipeline external protection cover system (4) comprises an external pipeline protection cover body (20), an external pipeline protection cover cover (21), a working electrode sealing plate (22) and a counter electrode sealing plate (23); the external pipeline protection cover body (20) is an external cylindrical structure, and the working electrode placement (24) and the reference electrode placement (25) are correspondingly arranged on the outer wall of the opening on one side of the external pipeline protection cover body (20); the counter electrode placement (26) is arranged on the same side as the working electrode placement (24); The electrochemical in-situ monitoring device system (1), the weightlessness sample placement system (2), and the adhesion sample placement system (3) are sequentially connected and inserted into the interior of the external pipe protection cover body (20); and external pipe protection cover covers (21) are provided at both ends of the external pipe protection cover body (20) and connected to other pipes via screws and washers; The working electrode (12) is fixed at the working electrode placement (24), the counter electrode (5) is fixed at the counter electrode placement (26), and the reference electrode placement (25) is used to place the reference electrode. The working electrode (12), the counter electrode (5), and the reference electrode are electrically connected to the outside world through leads. The working electrode sealing plate (22) and the counter electrode sealing plate (23) are installed on the working electrode placement location (24) and the counter electrode placement location (26) respectively.

2. The integrated monitoring device for material service status in a pipeline under high pressure flow rate conditions according to claim 1 is characterized in that: The number of the working electrodes (12) and the weightlessness samples (14) placed is set according to the size of the pipeline.

3. The integrated monitoring device for the service state of materials in a pipeline under high pressure and flow rate conditions as claimed in claim 1, characterized in that: The working electrode (12) in the electrochemical in-situ monitoring system (1) is the material to be monitored, which is a metal or a coating material; the counter electrode (5) is a semicircular platinum sheet as material; and the reference electrode is an Ag / AgCl withstand voltage electrode.

4. An integrated monitoring device for the service status of materials in a pipeline under high-pressure flow rate conditions as described in claim 1, the integrated monitoring device can ensure that the sample is fixed under any adjustable parameter range of 0MPa-10MPa liquid pressure / gas pressure and 0m / s-15m / s flow rate and ensure the simulation of the fluid pressure working environment.

5. The integrated monitoring device for the service state of materials in a pipeline under high pressure and flow rate conditions as claimed in claim 1, characterized in that: The working electrode (12) in the electrochemical in-situ monitoring system (1) can realize in-situ electrochemical measurement by being connected to an external electrochemical workstation; the weightlessness sample placement system (2) is constructed using a mortise and tenon structure, which is convenient for installation and disassembly to measure the weightlessness of the material.

6. The integrated monitoring device for the service state of materials in a pipeline under high pressure and flow rate conditions as claimed in claim 1, characterized in that: In order to meet the fluid flushing environment conditions, the adhesion test sample placement system (3) has a trapezoidal structure at the end of the adhesion pipe cover (19), which can quickly disperse and bundle water flow at the front and rear ends of the external pipe protection cover body (20) to achieve a state in which the fluid completely flushes the surface.

7. The integrated monitoring device for material service status in a pipeline under high pressure flow rate conditions as claimed in claim 1, characterized in that: The number of the adhesion samples (18) is set according to the size of the pipe body in the adhesion test sample placement system (3).

8. The integrated monitoring device for material service status in a pipeline under high pressure and flow rate conditions as claimed in claim 1, characterized in that: The external pipe protection sleeve body (20), the external pipe protection sleeve cover (21), the working electrode sealing plate (22), and the counter electrode sealing plate (23) are all made of 316L stainless steel; the weightless pipe locking tenon part a (13), the weightless pipe external locking ring (15), and the weightless pipe locking tenon part b (16) are all made of nylon; the weightless sample (14) can be made of any material, and the rest are made of polytetrafluoroethylene.

9. The integrated monitoring device for the service state of materials in a pipeline under high pressure and flow rate conditions as claimed in claim 1, characterized in that: The counter electrode (5) is made of a platinum sheet, with a platinum wire welded near the center of the platinum sheet. The platinum sheet is bent into a semicircular shape, and the welded platinum wire is completely covered with a heat shrink tube.

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