68 results about "Erosion corrosion" patented technology

The invention relates to the technical field of high-corrosion-resistance stainless steel pipe processing, and discloses a high-corrosion-resistance high-molybdenum stainless steel pipe processing technology based on gradient carbide design, which comprises the following steps: applying an axial gradient magnetic field in a stainless steel pipe rolling process, and combining with dynamic strain rate matching rolling to promote molybdenum atom grain boundary migration and inhibit carbide coarsening, so as to obtain a high-molybdenum-resistance stainless steel pipe. Nano carbide smaller than or equal to 50 nm is formed on the surface layer, and submicron carbide of 200-500 nm is formed on the core part; after rolling, micro-arc oxidation and phosphonic acid group silane dipping are immediately carried out to form a self-repairing passivation film; and finally, an alternating magnetic field and pulse current are adopted for cooperative annealing, and a grain boundary molybdenum-poor region and residual stress are eliminated. Through magnetic field-chemical-thermal multi-field coupling, the material has erosion corrosion resistance of a gradient carbide structure, dynamic passive film self-repairing and low-temperature high toughness, and is suitable for long-acting protection of deep sea oil and gas pipelines.

The invention belongs to the technical field of surface engineering, and particularly relates to a laser cladding iron-based corrosion-resistant and wear-resistant coating and a preparation method thereof. The invention relates to a laser cladding iron-based corrosion-resistant and wear-resistant coating which comprises the following iron-based alloy powder components in percentage by mass: 0.2-0.4% of C; 2.0 to 3.0% of B; the content of Cr is 12.0 to 16.0 percent; 0.5 to 1.0 percent of Ti; 0.5 to 1.5 percent of Si; 0.5 to 1.0 percent of Ni; 0.3 to 0.7% of Ce; s is less than 0.03%; p is less than 0.045%; and the balance of Fe. The coating has the beneficial effects that the coating takes the iron-based alloy powder as a raw material, and the iron-based alloy powder is uniformly cladded on the surface of the H13 steel by utilizing a laser directional energy deposition technology, so that a compact and uniform corrosion-wear-resistant cladding layer is formed, and the service life of the material under the working condition of erosion corrosion of molten aluminum is remarkably prolonged.

The invention discloses a planar short-wave infrared detector and a preparation method and application thereof. The preparation method comprises the following steps: S1, sequentially growing the buffer layer, the N-type contact layer, the absorption layer, the undoped P-type layer and the cap layer on the substrate; s2, growing a layer of dielectric film on the surface of the cap layer; corroding the exposed cap layer by adopting a wet etching process; s3, removing the dielectric film after corrosion is finished; p-doped Al < 1-w > InwAs is grown in the corrosion area; s4, removing the cap layer and the P-doped Al < 1-w > InwAs on the upper surface of the undoped P-type layer; s5, growing a layer of passivation film on all the exposed upper surfaces; and forming a pattern of a metal contact layer on the surface of the passive film by photoetching to form a P electrode and an N electrode. According to the invention, the problem of high Zn diffusion process difficulty caused by large lattice mismatch between the epitaxial layer with high In component and the substrate is solved, and the performance of the device is improved.

The invention belongs to the technical field of erosion corrosion experiment testing, and particularly discloses an erosion corrosion experiment device and method for liquid-solid two-phase flow immersion jet flow, a cooling system is designed for solving the problem that the temperature of an erosion corrosion solution is increased due to the throttling effect, the heat dissipation area of a circulating erosion system is increased through finned tubes, and the heat dissipation efficiency is improved. And the erosion corrosion solution flowing through the finned tube can transfer heat to the liquid in the heat exchange groove, so that the temperature of a fluid medium of the erosion corrosion solution in the circulating erosion system is reduced. According to the invention, the included angle between the sample and the nozzle can be changed through the angle adjusting mechanism so as to test the material damage condition under the impact of different angles and different flow velocities, so that the real-time monitoring of the electrochemical process of the liquid-solid two-phase flow damaged material is realized; the erosion corrosion damage process and mechanism of a material in a multiphase flow environment can be researched conveniently, and gas can be injected into the immersion jet tank through the gas storage bottle and the gas injection pipe so as to realize an under-pressure experiment for dissolving acid gas.

The invention relates to the technical field of heat exchangers, and discloses a variable-angle guide plate structure for a fluorine-coated steel heat exchanger, which comprises a shell, end sockets are mounted at the left and right ends of the shell, tube plates are mounted at the left and right ends of the inner wall of the shell, and a plurality of tube bundles are jointly mounted on the tube plates on the left and right sides in a penetrating manner; and a plurality of baffle plates which are uniformly distributed from left to right are mounted on the inner wall of the shell in a sliding manner. The variable-angle guide plate structure for the fluorine-coated steel heat exchanger can effectively solve the problems that in the prior art, a traditional fixed guide plate structure cannot optimize flow field distribution in real time, local retention of media in a shell pass can be caused to form a dead zone, or turbulent flow impact is caused by too high flow speed, heat exchange efficiency is reduced, erosion corrosion to a heat exchange pipe can be aggravated, and the service life of the heat exchange pipe is prolonged. The service life of equipment is shortened; the problems that a heat exchanger shell needs to be disassembled during angle adjustment, the industrial production continuity is seriously affected, a fluorine coating is likely to be scratched and fall off due to external force collision, and the anti-corrosion protection function of the heat exchanger shell is greatly attenuated are solved.

The invention belongs to the technical field of metal material stress corrosion test, and relates to a deep sea simulation test device for dynamic and static loading process, the main structure of the deep sea simulation test device comprises a pressure-resistant test cabin, and a loading sample piece, a pressure-resistant reference electrode and an annular auxiliary electrode arranged in the pressure-resistant test cabin, the loading sample piece is completely arranged in the pressure-resistant test cabin, and the annular auxiliary electrode is arranged in the pressure-resistant reference electrode. An adapter is connected with a dynamic and static loading system after penetrating through a cabin to perform static or dynamic stress loading, a pressure-resistant electrochemical test system is adopted to perform electrochemical characterization, test or polarization potential application, and a multi-factor control system is adopted to control main deep sea environmental factors such as temperature, pressure and dissolved oxygen content. High-precision and high-reliability test data can be quickly obtained, and corrosion electrochemical behaviors in stress corrosion and corrosion fatigue processes of metal materials in a deep sea simulation environment can be more truly reflected; the method provides support for metal material in-situ slow strain rate stress corrosion and corrosion fatigue test in a deep sea simulation environment and electrochemical test and characterization in the process.

The utility model discloses a coast subgrade framework in the field of coast subgrades, which aims to solve the problem that a concrete wall is easy to corrode and crack under long-time erosion corrosion of seawater in the prior art, and comprises a stainless steel plate, a wave dissipation plate for buffering sea wave impact and a buffering component, the stainless steel plate is mounted on a coastal surface of a coast subgrade, and the buffering component is mounted on the coastal surface of the coast subgrade. The wave dissipation plates are arranged on the stainless steel plate, the buffering assembly is arranged between the stainless steel plate and the wave dissipation plates, the wave dissipation plates are sequentially arranged on the stainless steel plate, and the ends of every two adjacent wave dissipation plates are arranged in an overlapped mode. The wave dissipation plates are sequentially arranged on the adjacent sea surface of the coast roadbed, the ends of every two adjacent wave dissipation plates are overlapped, the hinge pieces are arranged, when the wave dissipation plates are impacted by sea water, the wave dissipation plates can rotate by a certain angle, the wave dissipation plates rotate to the overlapped parts close to the upper ends, the impact of the sea water is buffered through the two wave dissipation plates at the same time, and the wave dissipation effect is improved. The buffering effect is improved, and the service life of the wave dissipation plate can be prolonged.

This invention discloses a method, equipment, medium, and product for quantitatively assessing the risk of erosion damage to pressure equipment, relating to the safety of pressure equipment in the petrochemical and chemical industries. The method includes: determining the damage form of the equipment; calculating a local / uniform thinning factor based on the damage form; calculating an equipment correction coefficient based on the local / uniform thinning factor, a general condition factor, a mechanical factor, and a process factor; calculating the probability of erosion corrosion failure based on the equipment correction coefficient, a management system evaluation coefficient, the average failure probability of similar equipment, and an impact coefficient for defects exceeding standards; calculating the leakage consequence area; determining the consequences of erosion corrosion failure based on the leakage consequence area; and establishing a two-dimensional risk matrix based on the probability of erosion corrosion failure and the consequences of erosion corrosion failure. The two-dimensional risk matrix is ​​used for real-time quantitative assessment of erosion risk. This invention can effectively guide the prevention and control of erosion corrosion risks in the petrochemical and chemical industries.

This utility model relates to the field of biogas hydrogen sulfide pipeline technology and discloses a protective structure for biogas hydrogen sulfide pipeline corrosion, including a transmission pipeline and a fixing sleeve. A spraying mechanism is fixedly installed on the side of the transmission pipeline, and a flow rate regulating mechanism is fixedly installed on the inner wall of the fixing sleeve. The flow rate regulating mechanism includes a bend, and a connecting block is fixedly installed on the inner wall of the bend. First, the speed of the drive motor is adjusted by the controller, thereby adjusting the flow rate generated when the fan blades rotate. Then, the drive motor is turned on, and the rotation of the drive motor drives the fan blades to rotate, thereby drawing air from outside the bend into the bend. The air is then diverted through the bend and split into eight transmission pipes, and then transmitted through a filter plate to the inside of the transmission pipeline. This adjustment of the flow rate inside the transmission pipeline helps to reduce the corrosiveness of hydrogen sulfide to the transmission pipeline. By controlling the upper limit of the flow rate, erosion corrosion is minimized, thus improving the protection of the transmission pipeline.

The application discloses a kind of test device and method for general erosion corrosion in fast reactor coolant environment, it is related to nuclear power material testing technical field, including corrosion kettle, heating device, stirring device and object table, heating device is used to heat corrosion kettle, stirring device includes rotary drive device and stirring assembly, the fixed end of rotary drive device is fixedly arranged on corrosion kettle, the driving end of rotary drive device is fixedly connected with stirring assembly, stirring assembly is inserted into corrosion kettle, for stirring the cooling medium in corrosion kettle, object table is arranged in corrosion kettle for carrying corrosion sample, gas inlet is provided on corrosion kettle, gas inlet is used to pass into hydrogen gas or oxygen gas mixture, to adjust the oxygen concentration in corrosion kettle.The application can truly reproduce the environment of flow medium erosion, corrosion deterioration and oxygen concentration synergistic effect under actual working condition.

The invention discloses a screening method and application of a liquid lead bismuth corrosion resistant material based on a sandwich structure. The outer layer of the sandwich structure is a target component film, and the interlayer is a lead-bismuth alloy film. The screening method comprises the following steps: S1, preparing a sandwich structure composite film material; s2, in-situ corrosion of liquid lead and bismuth of the composite film material; and S3, characterizing the corroded composite film material, and judging the liquid lead and bismuth corrosion resistance of the target component in the composite film material according to the characterization result. A sandwich structure film sample is prepared by utilizing a magnetron sputtering technology, the oxygen content of sandwich lead bismuth alloy is regulated and controlled by controlling the atmosphere in the deposition process, a corrosion interface of liquid lead bismuth and a test material is explored by adopting in-situ heating, and the problems that oxygen atoms are adsorbed on the surface of the sample, the oxygen content in the liquid lead bismuth cannot be precisely regulated and controlled and the like are solved. The corrosion performance of the material in oxygen-controlled liquid lead bismuth can be rapidly and efficiently obtained, and the method has important significance on rapid screening of novel lead bismuth corrosion resistant materials.

The invention relates to the field of oil and gas well drilling and production, and discloses experimental equipment for simulating erosion corrosion of an oil and gas well at high temperature and high pressure and a use method thereof. The experimental equipment comprises an erosion corrosion fluid module, a corrosion fluid module, a reaction kettle and a damage analysis module. The erosion corrosion fluid module is used for manufacturing an erosion corrosion fluid material; the corrosive fluid module is used for manufacturing corrosive fluid materials. The reaction kettle is provided with a reaction chamber for mounting an experimental object, and the experimental object is a combined body comprising an oil pipe, a sleeve and a cement sheath; the experimental object and the reaction chamber act together to form a first chamber in the oil pipe and communicated with the erosion corrosion fluid module, a second chamber located between the oil pipe and the casing pipe and communicated with the erosion corrosion fluid module, and a third chamber located between the casing pipe and the cement sheath and communicated with the erosion corrosion fluid module. And the damage analysis module is used for analyzing the experimental object and obtaining an erosion-corrosion analysis result of the experimental object, so that the erosion-corrosion resistance test experiment of the material under the complex underground working condition is completed.

The invention belongs to the technical field of material corrosion resistance testing, and discloses a liquid lead-bismuth high-speed erosion-corrosion device and method with controllable flow rate, comprising a liquid lead-bismuth environment module, an air supply module, a control module and a loading module; a liftable liquid-cooled sealing section is constructed by a KF flange water-cooled sealing lower connecting pipe and a KF flange water-cooled sealing upper connecting pipe, and a method combining a ferrule connection and a KF vacuum seal is used to achieve a telescopic lifting effect of the water-cooled section; in conjunction with a lifting platform, the accuracy of the erosion-corrosion test results can be guaranteed to the maximum extent, and the static oxidation corrosion influence of the liquid metal on the sample during the oxygen reduction process in the early stage of the test can be prevented; at the same time, a baffle plate is added to the inner wall of the test kettle to limit the relative flow caused by the viscosity of the liquid metal during the rotation of the re-corrosion test stand, thereby greatly reducing the error between the erosion speed calculated by the motor speed and the actual erosion speed.

The invention discloses an erosion corrosion early warning method, device and equipment for a tail gas pipeline of a reduction furnace. The method comprises the following steps: firstly, acquiring multi-source real-time data of a target monitoring point in the tail gas pipeline of the reduction furnace; based on the multi-source real-time data, obtaining a future silicon powder mass concentration prediction sequence and a future airflow velocity prediction sequence; inputting the data into a pre-constructed dynamic wear rate model and an effective impact energy accumulation model, and respectively calculating to obtain a first future pipe wall residual thickness sequence and a second future pipe wall residual thickness sequence; comparing the predicted pipe wall residual thickness at each future moment in the future pipe wall residual thickness sequence with a preset pipe wall residual thickness safety threshold, and determining a first predicted residual life and a second predicted residual life; and finally, based on the first predicted residual life and the second predicted residual life, generating early warning information of the pipeline eroded and corroded by the silicon powder. According to the invention, high-precision and foresight early warning of the erosion corrosion risk of the tail gas pipeline of the reduction furnace can be realized.

The invention belongs to the technical field of pipeline transportation, and particularly relates to a pipeline joint. The pipeline joint comprises a second pipeline and a first pipeline communicated to the pipe wall of the second pipeline, an arc-shaped piece is arranged in the connecting position of the second pipeline and the first pipeline, and fluid flows to the second pipeline from the first pipeline. According to the invention, erosion corrosion can be greatly reduced, the use safety and reliability of the sewage gathering and transportation pipeline are improved, and the maintenance and use cost is reduced.

The invention discloses seawater mortar erosion corrosion resistant steel and a preparation method thereof, belongs to the technical field of alloy steel, and solves the problems that wear-resistant steel in the prior art is high in high-cost element content and high in cost; and the erosion corrosion resistance of the existing wear-resistant steel is limited to be improved. The seawater mortar erosion corrosion resistant steel comprises the following components in percentage by mass: 0.12%-0.24% of C, 0.1%-0.6% of Si, 0.2%-1.17% of Mn, 2.0%-5.0% of Cr, 0.2%-1.0% of Al, 0.001%-0.003% of B, 0.01%-0.1% of Nb, less than or equal to 0.02% of P, less than or equal to 0.005% of S and the balance of Fe and inevitable impurities, and Cr / Al is more than or equal to 2 and less than or equal to 10. The seawater mortar erosion corrosion resistant steel is low in cost and excellent in mechanical property, welding property and seawater mortar erosion corrosion resistance.

The invention provides duplex stainless steel for a concentrated sulfuric acid environment and a preparation method and application of the duplex stainless steel, and the duplex stainless steel comprises the following components in percentage by weight: less than or equal to 0.03 wt% of C, less than or equal to 1.50 wt% of Mn, less than or equal to 2.0 wt% of Si, less than or equal to 0.03 wt% of P, less than or equal to 0.02 wt% of S, 24.5-27.0 wt% of Cr, 7.0-9.0 wt% of Ni, 3.5-4.5 wt% of Mo, 3.0-4.0 wt% of Cu, 0.50-1.0 wt% of W, 0.20-0.30 wt% of N and the balance of Fe and inevitable impurities. Through alloying of low carbon, high chromium, added nickel, copper, tungsten, nitrogen and other elements and coordination of all the components, the duplex stainless steel has good obdurability, sulfuric acid uniform corrosion resistance, erosion corrosion resistance, cavitation corrosion resistance and the like. The prepared duplex stainless steel can serve as an equipment material which is subjected to concentrated sulfuric acid and long-term scouring of fluid, the service time of the material can be remarkably prolonged, the maintenance cost and the construction period of the material are reduced, and the safety reliability and the production efficiency of fluid equipment operation are improved.

The invention provides a method and a device for accurately controlling and detecting sand content in an erosion experiment, and relates to the technical field of pipeline multiphase flow erosion corrosion, the device comprises a sand amount control part used for adjusting the sand adding amount of solid sand, so that a medium solution and the solid sand are uniformly mixed to obtain a sand-containing solution; and the sand amount detection part is used for detecting the sand content of the sand-containing solution. The invention provides the method and the device for controlling and detecting the sand content, which are simple, accurate and easy to realize. When the method and the device are applied to the pipe flow test, the problems of sand deposition, uneven sand distribution in a solution medium and the like are solved, the real flowing and scouring conditions of the pipeline are accurately reduced, and a foundation is laid for accurately analyzing the scouring corrosion mechanism.

An internal combustion engine lubricating oil composition for reducing corrosion of an engine of a hybrid vehicle is disclosed. The reduction in corrosion may be determined by the JIS K2246 test method. A method for reducing corrosion of an engine of a hybrid vehicle using the lubricating oil composition is also disclosed.

The invention discloses corrosion-resistant wear-resistant steel and a manufacturing method thereof, and belongs to the technical field of wear-resistant steel and preparation thereof, the wear-resistant steel comprises the following chemical components in percentage by weight: less than or equal to 0.22% of C, less than or equal to 0.50% of Si, less than or equal to 0.50% of Mn, less than or equal to 0.025% of P, less than or equal to 0.010% of S, less than or equal to 0.25% of Ni, less than or equal to 5.00% of Cr, less than or equal to 0.10% of Mo, less than or equal to 0.1% of rare earth + Nb and the balance of Fe, and the sum of the components is 100%. According to the wear-resistant steel produced by adopting a new process of specific alloy design of Cr + rare earth La and Ce + low-defect continuous casting + high-permeability rolling + multi-beam array jet flow constrained roller quenching, the alloy content is less than or equal to 6 wt%, the thickness is 8-40 mm, the surface hardness is 430-470 HBW, the corrosion and wear resistance is improved by more than two times compared with that of conventional NM450 under the acidic condition that the Ph value is 4-7, and the corrosion and wear resistance of the wear-resistant steel is greatly improved. And meanwhile, good machinability and welding performance are achieved.

The present invention discloses a rotary coupon corrosion experiment device, which includes a reaction kettle and a crucible. A sample is suspended by a connecting rod above the crucible. An upper condenser plate, a heat shield plate, a lower condenser plate and a graphite felt are arranged on the connecting rod. A gas supply component and a lifting and rotating component are also arranged on the connecting rod. At the same time, the present invention also discloses a method for rotary coupon corrosion experiment, in which the sample is extended into the corrosion medium in the crucible for rotation to conduct the erosion corrosion experiment of the sample and obtain the erosion corrosion performance of the sample. The present invention provides a sealed reaction environment through the reaction kettle to prevent the volatilization and leakage of the corrosion medium during the experiment. A connecting rod is arranged to suspend the sample, and the connecting rod extends out of the reaction kettle and is connected to the lifting and rotating component to drive the connecting rod to lift and rotate, thereby driving the sample to lift and rotate, realizing the entry and exit of the sample from the corrosion medium, and realizing the rotation of the sample in the corrosion medium for erosion corrosion.

The invention discloses a preparation method of a heterogeneous bimetal metallurgical composite casing pipe for seabed transportation. The preparation method comprises the following steps: S1, pretreatment of a base pipe; s2, material preparation, wherein 80-99.99 wt.% of Ni-based alloy powder and 0.01-20 wt.% of nano ceramic particles are subjected to ball milling to be evenly mixed, and mixed powder is obtained; s3, laser cladding is conducted, specifically, a coaxial powder feeding mode is adopted, and the mixed powder is subjected to laser cladding on the surface of the base tube; and S4, a composite layer is formed, specifically, under the action of a laser heat source, the Ni-based alloy is molten and metallurgically bonded with the base tube, the nano ceramic particles are not molten and are evenly dispersed and distributed in a cladding layer, and the wear-resistant and corrosion-resistant composite layer with the thickness being 0.2-3 mm is formed. Nano-scale ceramic particles and Ni-based alloy powder are compounded, and the nano-scale ceramic particles are uniformly dispersed and distributed in a cladding layer matrix by utilizing the high-temperature stability and non-melting characteristic of the nano-particles in the laser cladding process, so that the wear resistance of the composite layer is remarkably improved, and the material loss in the erosion corrosion process is inhibited.

The application discloses a safety measurement method, device and equipment of a multiphase flow pipeline and a medium, relates to the technical field of oil exploitation, and comprises the following steps: applying an alternating excitation signal to different electrode systems arranged on a target pipeline to obtain first electric impedance spectrum data and second electric impedance spectrum data of the target pipeline in a multiphase flow state. The first electric impedance spectrum data is converted into a complex dielectric constant, and a relaxation frequency is determined from the complex dielectric constant; according to the relationship between the relaxation frequency and the particle size, the crystal particle size is determined. According to the crystal particle size and the erosion time, the erosion loss is determined. The equivalent circuit model matched with the second electric impedance spectrum data is fitted to determine the corrosion characteristics. Based on the electric impedance spectrum technology, the accurate measurement of the particle size and the erosion corrosion of two scenes is realized, the method has the characteristics of simple operation, non-invasiveness and high measurement precision, and the safety transportation of the two-phase flow pipeline is ensured.

The invention belongs to the technical field of indirect air cooling system equipment protection, and relates to a preparation method of an SCAL type indirect air cooling system aluminum heat exchange pipe orifice and an aluminum heat exchange pipe. According to the invention, the aluminum heat exchange pipe orifice is designed into the horn mouth with a certain taper, so that the fluid dynamic condition of the pipe orifice is changed, and the flow erosion corrosion rate of the pipe orifice part is favorably reduced. The horn mouth length is obtained according to the original pipe diameter and the horn mouth taper, the horn mouth length is reasonably determined, and it is guaranteed that the horn mouth shape can fully play a role in reducing the flow erosion corrosion rate. And carrying out laser cladding on the horn mouth of the aluminum pipe orifice by adopting nickel-based alloy powder. And a nickel-based alloy coating is formed on the surface of the horn mouth of the aluminum pipe orifice, so that the wear resistance and corrosion resistance of the surface of the pipe orifice are enhanced. Through innovative design of the pipe orifice structure and strengthening treatment of the surface, the flow erosion corrosion rate of the pipe orifice part is remarkably reduced, and long-term protection of flow erosion corrosion of the aluminum heat exchange pipe orifice is facilitated.

The application discloses a tungsten steel metallographic analysis method cooperating with super-precision pretreatment and a novel corrosion system, and comprises the following steps: a, tungsten steel blank line cutting processing; b, nanoscale processing through a super-precision grinding machine; c, grinding and polishing treatment through a superfine diamond suspension to obtain a tungsten steel sample with a surface roughness Ra of a metallographic corrosion surface of less than or equal to 1 nm and parallelism of less than or equal to 0.1 microns; d, constructing a novel corrosion system: mixing a hydrogen peroxide solution with a mass fraction of 50% and a hydrofluoric acid solution with a mass fraction of 10% according to a volume ratio of 1:1 to obtain an HF-H2O2 corrosion liquid; e, metallographic corrosion of the tungsten steel sample through the HF-H2O2 corrosion liquid; f, cleaning and drying treatment after corrosion; and g, metallographic observation. The application can effectively balance high machining precision, efficient corrosion effect and environmental friendliness, and can effectively improve the analysis efficiency and result accuracy of tungsten steel metallographic analysis.

The present application relates to the technical field of metal material corrosion and protection, and particularly relates to a non-passivated metal material erosion corrosion evaluation method based on time-performance coupling, comprising setting test conditions and data collection schemes; synchronously collecting time-performance data; quantitatively determining three critical time nodes for dividing the whole erosion corrosion cycle into stages of different failure risk levels as the quantitative demarcation points of time-performance coupling; dividing the whole erosion corrosion cycle into risk stages; and performing comprehensive evaluation. The present application has the following advantages: based on the nonlinear evolution characteristics of the erosion corrosion damage mechanism, a dynamic evaluation system of time-performance coupling is established, the whole erosion corrosion cycle is divided into stages of different risk levels by quantitatively determining three critical time nodes, the precise mapping of the time dimension and the material performance attenuation process is realized, and the key problem that the traditional method cannot reflect the whole process behavior of the material from the initial damage to the final failure is solved.

The invention provides a method and a system for detecting corrosion characteristics of an oil and gas production and transportation pipe in a hypersalinity CO2 environment. The method comprises the following steps: acquiring apparent velocity and mineralization parameters of the oil and gas production and transportation pipe in a working state; determining bubble stability characteristics of the oil and gas production and transportation pipe according to the apparent velocity, and determining a transition interval of conversion from the bubble to the slug flow according to the bubble stability characteristics and the mineralization parameters; according to the pressure fluctuation data and the mineralization parameters, slippage analysis is conducted on the flowing state of the bubbles, a collapse hot spot area during bubble slippage collapse is obtained, and the collapse pressure gradient of the collapse hot spot area is determined; superposing concentrated breakout of the bubbles in the breakout hot spot area through the breakout pressure gradient and the distribution characteristics of the bubbles to obtain breakout impact strength; and determining the erosion corrosion area of the bubbles to the pipe wall based on the collapse impact strength and vortex distribution of the oil and gas production and transportation pipe. By the adoption of the scheme, the corrosion area can be determined by combining the scouring effect of bubble groups and vortexes on the pipe wall in the process of converting the bubble-shaped flow to the slug flow.

The utility model discloses an erosion corrosion resistant throttle valve, which relates to the technical field of throttle valves and comprises a throttle valve body, one side of the throttle valve body is fixedly connected with a water inlet pipe, one side of the throttle valve body is fixedly connected with a water outlet pipe, and the inside of the water inlet pipe is fixedly connected with a second slow flow pipe. One side of the second flow slowing pipe is fixedly connected with a first flow slowing pipe, and the flow slowing device has the advantages that through mutual matching of the first flow slowing pipe and the first flow slowing plate, flowing media can be preliminarily buffered, so that the certain flow speed is reduced, the impact force on the third flow slowing plate is reduced, and the flow slowing effect is improved. And through mutual cooperation of a second flow slowing pipe, a flow slowing groove and a second flow slowing plate, a flowing medium can be further shunted and buffered, so that the impact force of the medium on the inner walls of the water inlet pipe, the throttling valve body and the water outlet pipe is reduced, and the service life of the erosion-corrosion-resistant throttling valve is prolonged.

The invention belongs to the technical field of alloy materials, and particularly relates to a high-strength erosion-corrosion-resistant copper-nickel alloy and a preparation method and application thereof. The high-strength erosion-corrosion-resistant copper-nickel alloy comprises 26%-29% of Ni element, 1%-2% of Fe element, 2%-4% of Mn element, 1.5%-2.5% of Al element, 0.3%-0.5% of Cr element, 0.6%-1% of Nb element and the balance Cu element and inevitable impurities. The copper-nickel alloy material obtained by optimizing the types and contents of elements in the nickel-copper alloy and optimizing the matched thermomechanical treatment process and aging process has excellent comprehensive performance, and particularly has relatively high strength and high-flow-rate sediment seawater erosion corrosion resistance.

The application discloses a liquid lead and bismuth erosion corrosion resistant composite coating and a preparation method and application thereof, and relates to the technical field of surface protection. The method comprises the following steps: spraying a FeCrAlY coating on the surface of a substrate, performing remelting treatment and light finishing treatment on the FeCrAlY coating, and pre-oxidizing the coating. The FeCrAlY coating is sprayed on the surface of the substrate, and then the FeCrAlY coating is subjected to remelting treatment, so that the interlayer interface between the particles in the FeCrAlY coating disappears, and the effect of hole sealing is achieved. The light finishing treatment can polish the coating on the surface of the substrate to be flat. When the liquid lead and bismuth eutectic alloy flows, circulates and cools, the erosion corrosion effect of the liquid lead and bismuth eutectic alloy on the coating is reduced, and the service life of the coating is prolonged. Finally, the pre-oxidation treatment is performed on the surface of the coating, a continuous and dense thermal growth oxide layer is generated in situ on the surface of the coating, the wettability of the liquid lead and bismuth alloy is effectively reduced, and the long-time service stability is improved.