75 results about "Aqueous corrosion" patented technology

The invention discloses a seawater corrosion environment biaxial test system and method based on Raman spectrum. The seawater corrosion environment biaxial test system comprises a biaxial in-situ loading device, a seawater corrosion environment simulation box and a Raman spectrum measuring instrument. According to the biaxial in-situ loading system coupled with the seawater corrosion environment and used for Raman spectrum measurement, simulation of a complex stress state and the seawater corrosion environment is achieved by coupling the biaxial in-situ loading equipment and the seawater corrosion environment simulation box, and meanwhile, based on the Raman spectrum measurement instrument, the measurement accuracy is further improved through data analysis. Key information such as chemical product evolution laws in the stress corrosion process is obtained in situ, and a technical foundation is laid for clarification of a corrosion failure mechanism of a material under a real deep-sea service condition.

The invention belongs to the technical field of simulation calculation, and particularly relates to a metal grounding body underground water corrosion characteristic simulation calculation method, which comprises the following steps: preparing a metal grounding body sample, and preparing an electrolyte; carrying out a polarization curve and electrochemical impedance spectroscopy test, and carrying out data fitting and corrosion kinetic parameter extraction on a test result; establishing a three-dimensional finite element model of the metal grounding body under an actual environment condition based on a polarization fitting curve obtained by data fitting and the extracted corrosion kinetic parameters; and performing grid division, performing simulation calculation on corrosion rates of the metal grounding body under different environmental conditions, and further calculating corrosion rate distribution, thereby realizing corrosion rate prediction of the metal grounding body under the actual environmental condition. According to the method, electrochemical experiment testing and finite element simulation modeling are fused, and the method is suitable for conducting quantitative prediction and material comparison evaluation on the corrosion rate of the metal grounding body in the groundwater environment where different pH values and multiple corrosive anions coexist.

The invention discloses a corrosion-resistant insulating aerial cable which sequentially comprises a conductor layer, an insulating layer, a shielding layer, a corrosion-resistant layer and an outer sheath from inside to outside. The conductor layer is an aluminum alloy stranded wire of which the surface is coated with an anti-oxidation coating; the insulating layer is made of crosslinked polyethylene doped with 3-5% of nano silicon dioxide; the corrosion-resistant layer is a fluoroplastic or polyurethane coating; and the outer sheath is polyvinyl chloride added with an antioxidant and an ultraviolet light absorber. The fluoroplastic coating is formed through electrostatic spraying, and the surface of the copper wire shielding layer is subjected to phosphating pretreatment; the doped nano material enhances the mechanical strength and ultraviolet resistance of the insulating layer; the spiral groove design accelerates drainage and reduces accumulated water corrosion.

The invention discloses an alkaline coal-water corrosion-resistant wear-resistant steel and a preparation method thereof. By reasonably adding elements such as Cr, Cu, Ni, and Sb, the self-corrosion potential and hardness a of the steel plate are improved, and at the same time, a wear-resistant steel with a structure of lower bainite + martensite + retained austenite is obtained; and through process design, the occurrence of cracks in the Sb-containing wear-resistant steel during the production process is effectively suppressed, and a large amount of Ti precipitated phases are retained inside the structure as hydrogen traps, thereby reducing the risk of delayed cracking of the Sb-containing wear-resistant steel plate during use; and through the composite addition of Ti and Mo, in conjunction with a slow cooling process and a heat treatment process design, a large amount of Ti and Mo composite carbides are retained in the quenched steel plate, and these carbides serve as hydrogen traps, thereby greatly improving the hydrogen-induced crack resistance of the Sb-containing wear-resistant steel during service, and finally obtaining alkaline coal-water corrosion-resistant wear-resistant steel with excellent mechanical properties and resistance to hydrogen-induced cracks.

The invention discloses a corrosion-resistant high-entropy alloy surfacing layer for the surface of marine structural steel and a preparation method of the corrosion-resistant high-entropy alloy surfacing layer, and belongs to the technical field of structural steel. The preparation method comprises the following steps: (1) Co powder, Cr powder, Fe powder, Ni powder and Mo powder are mixed and then subjected to ball milling, and CoCrFeNiMo powder is obtained; (2) the metal matrix plate to be treated is subjected to alkali washing and then subjected to surface sand blasting roughening treatment till rough silver gray metal luster appears on the surface; and (3) a CoCrFeNiMo powder material serves as a raw material, plasma arc powder surfacing is conducted on the surface of the metal matrix plate subjected to sand blasting roughening, and the corrosion-resistant high-entropy alloy surfacing layer is obtained. The high-entropy alloy surfacing layer is high in bonding strength with a matrix, high in density, extremely low in porosity, excellent in corrosion resistance and capable of spontaneously resisting seawater corrosion, a passive film has high stability and pitting corrosion resistance, and the whole surfacing layer has good comprehensive corrosion resistance.

The invention belongs to the technical field of gas field water flow meter measurement, and particularly discloses a two-phase flow measuring device and method resistant to oil and gas field water corrosion. The device is used for measuring gas field water in a pipeline and is matched with a flow totalizer. Comprising a first differential pressure flowmeter used for measuring the mass flow of gas in a pipeline, a second differential pressure flowmeter used for measuring the mass flow of liquid in the pipeline, a temperature sensor used for measuring the temperature of the gas in the pipeline, and a liquid level differential pressure transmitter used for measuring the liquid level in the pipeline. The temperature sensor, the first differential pressure flow meter, the second differential pressure flow meter and the liquid level differential pressure transmitter are respectively connected with the flow totalizer. According to the invention, the problems of gas and liquid two-phase flow measurement, accurate sulfur-containing gas field water measurement and the like can be solved under the condition that gas field water components contain corrosive (especially sulfur-containing components), non-full pipe flow and liquid phase flow velocity.

The present invention belongs to the technical field of heat exchange equipment, and discloses a heat exchanger using a combined liquid dispersion device and an absorption unit to which the heat exchanger is applied. The absorption unit includes an absorber, a regenerator, an evaporator, and a condenser. The evaporator and the absorber are arranged vertically in the same cylinder body, and the condenser and the regenerator are arranged vertically in the same cylinder body. The absorber, the regenerator, and the evaporator adopt a heat exchanger structure of a combined liquid dispersion device of a liquid drip device and a liquid spray device, and the liquid is collected in a conical liquid collecting tank, so that problems such as liquid flooding of pipes and cavitation of the liquid delivery pump caused by liquid sloshing due to the inclination or sway of the unit can be avoided. The heat transfer tubes and the tube sheets adopt special materials and an expanding and welding processing technology, so that the liquid can be evenly distributed and dispersed under the inclined or swaying state of the marine lithium bromide absorption unit, and problems such as refrigerant pollution and seawater corrosion of the unit are solved, the stability of the unit operation is ensured, and the effective utilization of energy is realized.

The utility model provides a split type rotary joint supporting device which comprises a first supporting sleeve and a second supporting sleeve, the first supporting sleeve is connected with the second supporting sleeve in a sleeved mode, the upper portion of the second supporting sleeve extends into the inner side of the first supporting sleeve, and the lower portion of the second supporting sleeve is connected with the first supporting sleeve in a sleeved mode. A first drainage structure is formed between the upper part of the second supporting sleeve and the inner side of the first supporting sleeve, and a second drainage structure is formed between the inner side of the second supporting sleeve and the shell of the motor, so that the drainage effect is enhanced due to the arrangement of the double-layer independent drainage structure; and water stored on the spindle motor on the lower layer is reduced to a great extent, so that the phenomenon of corrosion caused by the water stored on the spindle motor is reduced.

The utility model discloses a hot-rolled U-shaped steel sheet pile acute-angle notch accelerated fatigue test medium system device, which belongs to the technical field of fatigue test devices and comprises a hot-rolled U-shaped steel sheet pile, a low-temperature fatigue test system, a seawater corrosion medium system and a rubber soft sealing cover system. The low-temperature fatigue test system comprises a condenser, an evaporator, a refrigeration compressor, an expansion valve and a circulating fan; the seawater corrosion medium system comprises a corrosion medium storage box, a filter, a corrosion-resistant pump and a steam heat exchanger. According to the medium system device for the accelerated fatigue test of the acute-angle notch of the hot-rolled U-shaped steel sheet pile, cold air generated by the low-temperature fatigue test system can be conveyed into the rubber soft sealing cover system by the circulating fan so as to simulate a low-temperature test on the hot-rolled U-shaped steel sheet pile; and a corrosion medium can be introduced into the rubber soft sealing cover so as to simulate a seawater corrosion test on the hot-rolled U-shaped steel sheet pile.

The application relates to the coating technical field and discloses a composite coating as well as a preparation method and application of the composite coating. The composite coating comprises an inner layer, an outer layer and a bonding layer arranged between the inner layer and the outer layer; the outer layer is a basalt fiber cloth; and the preparation raw materials of the inner layer comprise 100 parts by weight of a first epoxy resin, 10-40 parts by weight of chopped basalt fibers, 5-30 parts by weight of hexagonal boron nitride, 0.5-5 parts by weight of a coupling agent, 1-3 parts by weight of a surfactant, 0.5-2.5 parts by weight of an antioxidant and 1-15 parts by weight of a curing agent. The composite coating provided in the application can significantly enhance the bonding strength between the composite coating and a base body through the interaction between the various components, can avoid the falling-off of the composite coating, can significantly improve the acid resistance and halogen water corrosion resistance of the composite coating, and is suitable for industrial popularization.

The invention discloses marine atmosphere corrosion-resistant high-toughness steel and a preparation method thereof, and relates to the technical field of steel production, and the marine atmosphere corrosion-resistant high-toughness steel comprises the following chemical components in percentage by mass: 0.025-0.035% of C, 1.29-1.51% of Si, less than or equal to 0.010% of P, less than or equal to 0.0010% of S, 1.6-2.9% of Cr, 0.41-0.65% of Cu, 0.15-0.45% of Al and 0.95-2.25% of Ti. And the balance of Fe and inevitable impurities. The high-toughness steel resistant to marine atmosphere corrosion has good seawater corrosion resistance and marine organism corrosion resistance, the safety of sailors, ships, transported goods and marine ecology is guaranteed, and the service life of the whole steel structure engineering is prolonged.

The utility model relates to a roof anti-seepage structure, and belongs to the technical field of roof anti-seepage, the roof anti-seepage structure comprises a roof main body, a waterproof structure used for reducing cracking at the joint of the roof main body is fixed at the top end of the inner side of the roof main body, a drainage pipe is fixed in the roof main body, and an anti-seepage drainage assembly is arranged at the top end of the waterproof structure. The anti-leakage drainage assembly comprises a drainage ditch, an insertion block, a check block fixedly installed at the top end of the insertion block and a sealing structure fixedly installed on the outer surface of the check block and used for enhancing the sealing performance of the check block. According to the roof anti-seepage structure, by arranging the anti-seepage drainage assembly, water can be prevented from being accumulated at the joint of the roof body wall gap, the anti-seepage effect of the joint of the roof cavity gap can be further improved, the combination end of the drainage pipe and the waterproof structure can be sealed and blocked, and the phenomenon of seepage at the combination end is reduced; and the phenomenon of damage caused by water corrosion is avoided.

The seawater corrosion detection device for the stainless steel pipe comprises a test pool, the test pool comprises a pool body, one side of the upper part of the pool body is fixedly connected with a synchronous clamping assembly, the synchronous clamping assembly is used for clamping a detected workpiece, and the inner wall of one end of the pool body is provided with a sea wave simulation assembly; the sea wave simulation assembly comprises a turning plate mechanism and a sea wave driving mechanism, the turning plate mechanism comprises at least one turning plate, a rotating shaft of the turning plate is hinged between mounting plates on the two sides of the turning plate, and each mounting plate is fixedly connected with the inner wall of one end of the pool body; the sea wave driving mechanism is connected with the overturning plate and can provide driving force for rotation of the overturning plate relative to a rotating shaft of the overturning plate. Compared with the prior art, the device has the technical effects that the device is provided with the turning plate mechanism, the movement of sea waves can be simulated, vivid detection working conditions can be given, and the test accuracy can be improved.

The present application relates to a kind of copper anchoring silicon defect montmorillonite-based anticorrosive material preparation method, by trace hydrofluoric acid etching montmorillonite, peeling off interlayer silicon atom to manufacture surface vacancy, with inorganic montmorillonite as carrier, interlayer silicon vacancy anchors copper ion to capture conductive polymer, realize in montmorillonite interlayer stable in situ polymerization.Polymer-montmorillonite is used as filler, and montmorillonite-based composite anticorrosive coating is prepared by coating method.Adding layered montmorillonite in coating matrix not only can provide physical barrier, prevent water, corrosive ion in environment from diffusing into substrate, but also can make conductive polymer maintain good dispersibility and long-term service stability in coating matrix, play the role of electrochemical shielding, thereby avoid the possibility of electrochemical reaction between corrosive substance and substrate, increase the corrosion resistance of coating.Preparation method, process is simple, reaction condition is mild;Raw material and equipment are cheap and easy to obtain, low cost;Synthesis efficiency is high, suitable for large-scale production.

The application discloses a phosphide nanometer array catalyst for seawater hydrogen evolution and a preparation method and application thereof. The catalyst takes foamed nickel as a carrier to provide support and conductive effect for the catalyst; the catalyst is composed of a composite material of nickel, molybdenum, phosphorus and cobalt, and a nanorod array structure of the catalyst main body is formed on the base. The cobalt-doped nickel molybdenum phosphide nanorod array catalyst provides high active sites, the phosphide layer is in-situ oxidized into an active phase of Ni(OH)2 to accelerate reaction kinetics, and granular phosphide (P-Metal bond) on the surface of the nanorod blocks Cl ‑ erosion, and a three-dimensional porous structure promotes bubble detachment to resist seawater corrosion; the catalyst can simultaneously serve as a cathode (HER) and an anode (OER) to realize dual-function integration, realizes full-hydrolysis voltage ≤1.60 V (10 mA cm ‑2 ) in 1 M KOH solution, and stably operates for ≥88 h (current density attenuation rate ≤10%) under a cell voltage of 1.90 V.

The invention belongs to the field of nuclear materials, and particularly relates to a nuclear fuel and a preparation method thereof and a reactor, the nuclear fuel comprises a nitride matrix and an MAX phase material distributed in the nitride matrix; the chemical formula of the MAX phase material is Mn + 1AXn, M is selected from at least one of Ti and Cr, A is selected from at least one of Si and Al, X is selected from C, and n is 1 or 2. According to the nuclear fuel disclosed by the invention, the MAX phase material is introduced into the nitride matrix, and a corrosion-resistant oxide layer is generated in situ by utilizing the MAX phase material to block water permeation, so that the nuclear fuel has the properties of high thermal conductivity, relatively strong water corrosion resistance, steam oxidation resistance and radiation resistance, and can be applied to a light water reactor; the application risk of the existing uranium nitride fuel in the light-water reactor is reduced, and the safety and economy of the reactor are improved.

A composition for corrosion control in aqueous systems, the composition providing a formulation of a concentrated aluminum corrosion inhibitor; and (i) a polycarboxylic acid polymer, (ii) a sulfonic acid polymer, (iii) a combination of a polycarboxylic acid and a polysulfonic acid, (iv) an organic phosphonate, (v) a combination of a phosphonate and a polycarboxylic acid, or (vi) a combination of a phosphonate and a polysulfonic acid. A method for corrosion control in aqueous systems, the method providing a concentrated formulation, the concentrated formulation having an aluminum corrosion inhibitor and (i) a polycarboxylic acid polymer, (ii) a sulfonic acid polymer, (iii) a combination of a polycarboxylic acid and a polysulfonic acid, (iv) an organic phosphonate, (v) a combination of a phosphonate and a polycarboxylic acid, or (vi) a combination of a phosphonate and a polysulfonic acid; and delivering the concentrated formulation to an aqueous stream.

The utility model discloses an automatic stainless steel plate machining device which comprises a machining table, electric sliding rails are symmetrically and fixedly installed on the two sides of the machining table, rail blocks are connected to the outer ends of the two electric sliding rails in a sliding mode, a blower is fixedly installed at the top of one rail block, and a motor is fixedly installed at the top of the other rail block. An electric heater is fixedly installed on one side of the air blower, protective nets are symmetrically and fixedly installed on one side of the electric heater, and a spraying assembly is arranged on the top of the other rail block. According to the scheme, the electric sliding rail, the rail block, the air blower, the electric heater and the protective net are arranged, the electric sliding rail and the rail block are matched to adjust the position of the air blower, the electric heater can heat air sucked by the air blower, the protective net blows the air to the surface of a stainless steel plate, and water of a cleaning acid solution on the surface of the stainless steel plate is conveniently dried; and hands of workers are prevented from being corroded by residual water of the cleaning acid solution on the surface of the stainless steel plate during unloading, and the workers are protected conveniently.

The invention discloses a metal environment fatigue correction factor prediction method considering a load retention effect. The method comprises the following steps: preparing a tubular fatigue sample and a high-temperature and high-pressure water corrosion fatigue test simulation device; after a plurality of factors such as the loading strain rate, the loading strain amplitude, the temperature, the oxygen concentration and the load keeping are controlled to be fixed, a fatigue test is carried out on the austenitic stainless steel material, so that the influence of each factor on the fatigue life of the austenitic stainless steel is researched; based on a fatigue life curve of the austenitic stainless steel in ASME room temperature air, according to a fatigue test result in a high-temperature and high-pressure water environment, an austenitic stainless steel environment fatigue correction factor prediction model is established by combining the influence of factors such as a loading strain rate, a loading strain amplitude, temperature and oxygen concentration on the fatigue life; and establishing an austenitic stainless steel environmental fatigue correction factor prediction model considering the load retention effect by introducing the influence of a load type and retention time.

The invention provides a seawater corrosion fatigue test system and method.The seawater corrosion fatigue test system comprises an upper fixing base, a lower fixing base and a salt bath assembly, the upper end and the lower end of a to-be-tested workpiece are clamped by the upper fixing base and the lower fixing base, the salt bath assembly is arranged between the upper fixing base and the lower fixing base, a salt bath solution is injected into the salt bath assembly, and the to-be-tested workpiece is placed in the salt bath assembly; and the workpiece to be detected passes through the salt bath solution of the salt bath assembly. According to the seawater corrosion fatigue test system and method provided by the invention, the salt bath barrel is additionally arranged between the two fixed seats, and the to-be-tested workpiece and the salt bath barrel are elastically sealed in a multi-sealing manner, so that the sealing problem caused by vibration deformation of the to-be-tested workpiece under a fatigue test condition can be solved; the salt bath solution environment is applied to the to-be-tested workpiece, but the fatigue test of the to-be-tested workpiece is not influenced, so that the fatigue test of the to-be-tested workpiece in the salt bath environment is realized, and a fatigue test result under a seawater condition can be obtained.

The application relates to the field of low-temperature seawater corrosion tests, in particular to a seawater-ice crystal two-phase flow rotating scouring corrosion test device. A low-temperature condensate water pipe is arranged on the periphery of an ice storage water mixture container, an ice storage screen cylinder is arranged in the inner cavity of the ice storage water mixture container, and a transmission shaft extends into the inner cavity of the ice storage screen cylinder in the vertical direction; a rotating disc is arranged at the lower end of the transmission shaft, a horizontal bottom tray is arranged at the bottom of the rotating disc, and the rotating disc and the bottom tray are connected through a working electrode; a transmission gear one and a brush slip ring are arranged on the upper part of the transmission shaft, the transmission gear one is fixedly connected with the transmission shaft, and the brush slip ring is tightly connected with the transmission shaft; one end of an electrochemical test lead is connected with the working electrode, the other end of the electrochemical test lead extends into the inner hole of the transmission shaft and is connected with the transmission shaft, and the brush slip ring is connected with an electrochemical test system and the electrochemical test lead respectively. The temperature control operation of the ice storage water mixture container is convenient, and low-temperature seawater simulation test can be realized.

The application discloses a coal mining machine electric control box provided with a serpentine three-dimensional heat dissipation water channel, and relates to the field of heat dissipation of coal mining machine equipment. The electric control box comprises a water-cooled bottom plate one, a water-cooled bottom plate two, a water-cooled vertical plate one, a water-cooled vertical plate two and a water-cooled vertical plate three which are contained in the electric control box body. The water-cooled vertical plate one and the water-cooled vertical plate two are left and right vertical plates of a frequency converter cavity, the water-cooled vertical plate three is located between the frequency converter cavity and a transformer cavity, and the water-cooled bottom plate is mounted at the rear half of the electric control box. The serpentine three-dimensional heat dissipation water channel structure of the electric control box is good in material, the shell body will not be broken, an anticorrosive layer is brushed in the water channel, the water corrosion resistance of the shell body is greatly increased, the water channel is in a serpentine shape, the heat dissipation performance of the water channel is increased, and the heat emitted by part of cavities can be effectively relieved. The serpentine three-dimensional heat dissipation water channel structure of the electric control box is hiddenly mounted, the shell body is neat and beautiful in appearance, the structure design is reasonable, and the water flow heat dissipation capacity is enhanced.

The invention provides an underground water corrosion water sample collection spacing optimization method and system, and relates to the technical field of hydrogeology and engineering safety crossing, and the method comprises the following steps: constructing a three-dimensional partition model; identifying corrosion high-risk change points by adopting a density clustering algorithm and generating an encrypted monitoring area; the economic cost, the interpolation precision and the high-risk coverage rate are balanced through a multi-objective optimization algorithm, and the partition reference spacing is determined; the sampling density is dynamically adjusted in combination with the corrosion factor exceeding multiple, and seasonal factors are introduced. Through coupling of the three-dimensional zoning model and the intelligent algorithm, accurate optimization of the sampling spacing is realized, sampling points are reduced by more than 40% compared with a traditional method, the coverage rate of a high-risk area is improved to 93%, the interpolation error is reduced by 4.8%, the monitoring cost is remarkably reduced, and the method is suitable for large-scale popularization and application. And a dynamic and low-cost technical scheme is provided for underground water corrosion prevention and control of linear engineering.

The utility model discloses a junction box used for a photovoltaic assembly and the photovoltaic assembly. The junction box used for the photovoltaic assembly comprises a housing, a control element and a sealing assembly. The control element is arranged in the shell; the sealing assembly is arranged in the shell and comprises a first sealing piece and a second sealing piece, the first sealing piece and the second sealing piece are sequentially arranged between the control element and the side wall of the shell, and the first sealing piece and the second sealing piece are different in water vapor transmittance. By arranging the first sealing element and the second sealing element in the shell, the first sealing element and the second sealing element form dual protection in the marine high-humidity, high-salt-mist and seawater corrosion environment, water vapor can be effectively prevented from permeating into the shell and the control element, the air tightness of the junction box is improved, the working environment of the junction box is improved, and the service life of the junction box is prolonged. The service life of the junction box is prolonged, the maintenance cost of the junction box is reduced, and the reliability and safety of the junction box are improved.

The utility model relates to the technical field of crown block grab buckets, and discloses an anti-corrosion crown block grab bucket. The anti-corrosion crown block grab bucket comprises a hanging ring, a connecting shaft is installed on the lower portion of the hanging ring in a penetrating mode, a connecting frame is installed on the lower portion of the connecting shaft in a penetrating mode, a hydraulic piston is installed on the lower portion of the connecting frame in a penetrating mode, and fixing frames are fixedly installed on the front side and the rear side of the connecting frame; a connecting block is movably installed in the center of the fixing frame, a connecting column is fixedly installed at the lower end of a hydraulic piston, the bottom end of the connecting column is fixedly connected with a movable block, the connecting column is made of stainless steel, and after the hydraulic piston extends to adjust the position of the movable block and enable the grab bucket to be opened, the crown block adjusts the position of the grab bucket to enable the grab bucket to be submerged in water. The connecting column can prevent the lower end of the hydraulic piston from being immersed in water and being corroded by slag flushing water, meanwhile, the connecting pipe and the grab bucket are made of stainless steel, and the service life of the grab bucket and the connecting pipe can be prolonged.

The invention discloses a condensation shell-and-tube heat exchanger. A condensation heat exchange module of the heat exchanger is installed in a box body, the condensation heat exchange module comprises an enhanced heat exchange tube array and a flow guide assembly, the enhanced heat exchange tube array is located between cellular tube plates of the flow guide assembly, and a spiral turbulent flow structure is arranged in the enhanced heat exchange tube array. Flue gas spoilers are also obliquely arranged on the cellular tube plate and are distributed in the enhanced heat exchange tube array in a staggered manner to form a continuous wave-shaped flow channel and a periodic contraction-expansion flow channel; a water collector below the box body collects and discharges liquefied flue gas through a gradually-shrunk condensate water collecting cavity. A laminar flow boundary layer is broken through a spiral-fin composite heat transfer structure, and the heat exchange uniformity is improved in combination with a multi-pass turn-back water flow channel. Through the synergistic effect of the V-shaped turbulent flow and the gradually-shrinking flow channel, the flue gas temperature is obviously reduced. The double-protection system effectively blocks the corrosion of acidic condensate water, and the modular design reduces the manufacturing cost while cancelling an additional protection cavity.

The application discloses a waterproof and corrosion-resistant fluorine-containing ferroelectric electret and a preparation method thereof, and belongs to the technical field of cross technology of functional polymer materials and flexible electronics. The fluorine-containing ferroelectric electret is prepared by edge fusion encapsulation of upper and lower dense polymer films and an intermediate layer, and then subjected to corona polarization treatment, and the intermediate layer is a single-layer structure of a porous polymer film or an alternating arrangement structure of a porous polymer film and a dense polymer film. The application provides structural regulation and edge fusion composite process innovation for the open-pore fluorine-containing multilayer polymer film, so that the prepared fluorine-containing ferroelectric electret not only has flexibility, high-temperature resistance and excellent piezoelectricity (greater than or equal to 400 pC / N), but also has waterproof and corrosion-resistant capability. After electrodes are connected to the opposite sides of the electret, the fluorine-containing ferroelectric electret is suitable for sensing, acoustics and energy collection scenes in harsh environments such as high temperature and salt water corrosion.

A seawater pipeline dynamic water corrosion online monitoring device is arranged on a connecting pipeline and comprises a coupon monitoring module, a resistance probe monitoring module and an ultrasonic monitoring module, an integrated monitoring system flange is arranged on the connecting pipeline, and the coupon monitoring module, the resistance probe monitoring module and the ultrasonic monitoring module are all arranged on the integrated monitoring system flange. The coupon monitoring module is used for providing long-term corrosion rate data, a coupon is prepared from a material for connecting a pipeline, and the long-term corrosion rate is calibrated through the combination of mass loss and electrochemical impedance spectroscopy, and the resistance probe monitoring module can improve the acquisition precision of the dynamic water environment enhanced data and perform real-time online monitoring of the corrosion rate. And the ultrasonic monitoring module adopts a distributed array sensor layout and is used for monitoring the corrosion thinning condition and local corrosion characteristics of the pipeline, so that the system has the advantages of comprehensive monitoring dimensions, capability of performing real-time monitoring, high monitoring result precision and suitability for long-term use.

The invention belongs to the technical field of nuclear fuel development, and particularly relates to a preparation method of a large-grain UO2 fuel pellet. The preparation method comprises the following steps: (1) uniformly mixing a grain growth substance and an acid-deficient uranyl nitrate solution, adding saturated ammonium carbonate or introducing reaction gas for precipitation reaction to generate an AUC precipitate; the reaction gas is a mixture of NH3 and CO2; (2) filtering the AUC precipitate to obtain a filter cake, and washing, filtering, drying and calcining to obtain powder; (3) granulating the powder, and forming to obtain a green fuel pellet; and (4) sintering the green fuel pellet to obtain the large-grain UO2 fuel pellet. The average grain size of the prepared large-grain UO2 fuel pellet is larger than or equal to 40 micrometers, and the large-grain UO2 fuel pellet has the high melting point, good water corrosion performance and irradiation stability of traditional UO2 fuel and further has the low fission gas release rate and the high heat conductivity.

The invention provides a flexible magnetic sheet and a preparation method thereof and false eyelashes, and the flexible magnetic sheet comprises the following components in percentage by weight: 88-94 parts of samarium-iron-nitrogen magnetic powder, 6-10 parts of a binder, 0.7-1.5 parts of a coupling agent, 0.2-0.8 part of a lubricant and 0.2-0.8 part of a heat stabilizer; wherein the samarium iron nitrogen magnetic powder is granular, and the average particle size of the samarium iron nitrogen magnetic powder is 2-50 microns. The false eyelashes prepared by the method have better flexibility and stability and strong sweat corrosion resistance, and the flexible magnetic sheet has better flexibility, light weight, better suitability with the false eyelash body and longer service life, and has wide industrial application prospects.