50 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 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 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 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.

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 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 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.

The utility model relates to a cabinet and an energy storage system, and belongs to the technical field of energy storage. The cabinet body is provided with a cabinet top face, and a sinking groove penetrating through the cabinet top face is formed in the side, located on the cabinet top face, of the cabinet body. The hoisting unit is embedded in the sinking groove and comprises a base body and a plurality of hoisting parts arranged on the base body, the base body is fixedly connected with the cabinet body, a drainage flow channel is formed in a groove opening, facing the sinking groove, of the base body, the hoisting parts are distributed in the drainage flow channel, and the cabinet body is provided with a drainage port communicated with the drainage flow channel. The hoisting unit can be prevented from being repeatedly disassembled, assembled and installed, the occupation of the hoisting unit on the cabinet body placement space is reduced, the cabinet body hoisting efficiency is improved, and the problem that the cabinet body and the hoisting unit are corroded by accumulated water is solved.

The invention discloses a deep sea gate valve parameter optimization and performance detection method based on multi-physics field coupling, and relates to the field of gate valve health management, and the method comprises the steps: building a multi-physics field coupling model comprising a deep sea pressure field, an ocean current impact flow field, a seawater corrosion chemical field and a structural mechanics field; for the multi-physics field coupling model, inputting deep sea related parameters, namely valve body related parameters, performing optimization design on a valve body structure, a sealing assembly, a valve rod structure and a valve core shape of the gate valve, and determining a value combination of each parameter to generate a plurality of groups of candidate parameter schemes; according to the method, a multi-physics field coupling model covering deep sea pressure, ocean current impact, seawater corrosion and structural mechanics is established, the comprehensive effect of the deep sea complex environment on the gate valve can be accurately mapped, and a multi-performance index weight optimization function is combined with constraint conditions by inputting key parameters; scientific design of key parameters of the valve body, the sealing assembly, the valve rod and the valve element is achieved.

This invention provides an experimental method for simulating high-pressure seawater corrosion inside pipes. The apparatus includes a seawater circulation system and a temperature control system. The seawater circulation system includes a seawater tank. Seawater in the tank is partially driven by a centrifugal pump through an isolation valve and returns to the seawater tank via a bypass valve to mix the seawater inside. The remaining seawater passes through a main line resistance regulating valve and enters a branch test pipeline. In the branch test pipeline, the seawater sequentially passes through a branch line resistance regulating valve, a branch flow meter, and the test tank before converging into the main line return water pipeline and flowing back to the seawater tank via a return water resistance regulating valve. The seawater tank is connected to a pressure control device. This experimental apparatus simulates the corrosion of pipes in a deep-sea environment. Long-term simulation and observation of corrosion behavior are achieved through this apparatus, enabling precise temperature control over a wide temperature range. It can simulate the temperature difference environment inside and outside the pipe, reproducing the corrosion conditions under real heat exchange conditions.

The invention relates to the technical field of blockage prevention of a sewage discharge pump at the bottom of a heating furnace, in particular to a method for preventing the sewage discharge pump at the bottom of the heating furnace from being blocked, which comprises the following steps: optimizing and diverting vaporization sewage discharge of the heating furnace, connecting a sewage discharge port of a vaporization system with a pipeline, and directly discharging the vaporization sewage discharge to a final discharge point through the pipeline. Vaporized sewage does not flow to the furnace bottom wastewater collecting well any more; for a pollution discharge point which cannot be subjected to diversion treatment, a sedimentation tank is arranged in the middle from vaporized pollution discharge water to a water collecting well, salt in the sewage is firstly settled in the sedimentation tank, and crystals in the sedimentation tank are regularly cleaned. The problems that an impeller of an existing sewage pump for the water collecting well at the bottom of the furnace is often stuck, water in a furnace pit rises, a flue steel structure is corroded, and a heat preservation material is damaged are solved.

In the field of lure technology, we provide lures that are manufactured using ceramic craftsmanship. [Solution] The fish-shaped object comprises a integrally molded ceramic fish-shaped body 1, and the surface of the ceramic fish-shaped body is covered with a glazed protective layer 2 having a biomimetic pattern structure. The ceramic material of the fish-shaped body has superior chemical stability compared to metal and plastic, effectively suppressing seawater corrosion and physical abrasion, and maintaining the integrity of the painted color even after long-term use. The biomimetic pattern structure is designed using various methods such as batch transfer decals and hand-painting, and after firing, the glazed protective layer is formed, enabling functions such as scale pattern imitation, fluorescence effect, and reflective treatment. The glaze on the surface mimics the shimmer of fish scales under different lighting conditions, enhancing its attractive effect to carnivorous fish.

A novel reinforced waterproof device for bolt joints of a steel structure roof comprises the steel structure roof, a device body is arranged at each bolt connecting joint of the steel structure roof, the device body comprises a bottom plate and a side plate, a bolt opening is formed in the bottom plate, a bolt is arranged in the bolt opening, and the bottom plate is fixedly connected with the steel structure roof on the lower portion through the bolt; the device main body is connected with the upper cover through a hinge, the upper cover comprises a cover plate and a side cover, a buckle is arranged on a bottom plate of the device main body, and the device main body is connected with the side cover through the buckle. Compared with the prior art, the utility model has the following beneficial effects: the bolt node is not directly exposed in the air, so that the corrosion of the node can be effectively slowed down. Bolts are not in direct contact with rainwater, and node water leakage and corrosion can be effectively prevented.

The utility model provides a reinforcing system for preventing an anchor rod and an anchor cable from being corroded by sulphide ore leaching water, which comprises an unstable side slope, an anchor hole is arranged on the unstable side slope, the anchor rod is arranged in the anchor hole, and concrete is grouted between the anchor hole and the anchor rod; an anti-flushing concrete boss used for protecting the anchor rod is arranged on the slope surface of the unstable slope, an anti-flushing water stop belt is arranged on the upper portion of the anti-flushing concrete boss, one end of the anti-flushing water stop belt is located in the anti-flushing concrete boss, and the other end of the anti-flushing water stop belt is located outside the anchor rod. According to the reinforcing system, corrosion and aging of sulfide ore leaching water on the unstable side slope of the sulfide ore mine to the anchor rods and the anchor cables can be avoided to the maximum extent, the service life of the anchor rods and the service life of the anchor cables are prolonged, and the technical problem that in the prior art, the anchor rods and the anchor cables on the unstable side slope of the sulfide ore mine are corroded by the sulfide ore leaching water is solved. If the active protective net is damaged, original anchor rods and anchor cables can be used for binding and reinforcing, and the utilization rate of the original anchor rods and anchor cables is increased.

The invention belongs to the field of stainless steel welded pipe production, and particularly discloses a manufacturing process of a duplex stainless steel welded pipe for ocean engineering, which is characterized in that the spot corrosion performance of a finished product welded pipe reaches the advanced level of international similar products by controlling the welding speed, the welding current, the welding voltage and the welding gas; the method puts forward higher requirements on the welding heat input quantity and the welding gas, and a final spot corrosion test (corrosion data is less than 1g / m < 2 >, and no spot corrosion is found under 20 times) is carried out. The duplex stainless steel welded pipe for ocean engineering meets the working condition requirements of sea water corrosion, and is also suitable for stainless steel welded pipes with different specifications.

The application relates to the technical field of cables, and discloses a waterproof and corrosion-resistant bus cable and a preparation method.The polyethylene, PET copolyester, dicumyl peroxide and the like are mixed, extruded through a screw extruder, and granulated to obtain a sheath material layer.The compatibility and interface bonding performance of the PET copolyester and the polyethylene are good, which is beneficial to improving the mechanical properties of the PET / PE composite sheath material layer and the cable, the PET copolyester and the PE are chemically crosslinked, the crosslinking degree of the molecular chains is increased, the heat resistance is improved, and the entry of corrosion media such as water and salt into the composite sheath material layer is inhibited, which is beneficial to improving the high-temperature salt water corrosion resistance of the sheath material layer and the cable, and the prepared bus cable, submarine cable and the like have better practical application in a high-salt and high-humidity environment.

The invention discloses a waterproof and anti-corrosion fluorine-containing ferroelectret and a preparation method thereof, and belongs to the cross technical field of functional polymer materials and flexible electronic technologies. The fluorine-containing ferroelectret is prepared by carrying out edge fusion packaging on an upper dense polymer film, a lower dense polymer film and a middle layer and then carrying out corona polarization treatment, and the middle layer is of a porous polymer film single-layer structure or a porous polymer film and dense polymer film alternate arrangement structure. The fluorine-containing ferroelectret and the preparation method thereof have the advantages that the structure regulation and the edge melting composite process of the porous fluorine-containing multilayer polymer film are innovated, so that the prepared fluorine-containing ferroelectret not only has flexibility, high temperature resistance and excellent piezoelectricity (greater than or equal to 400pC / N), but also has waterproof and anti-corrosion capabilities, and after electrodes are connected to the two opposite sides of the electret, the performance of the electret is greatly improved. The sensor is suitable for sensing, acoustics and energy collection scenes in harsh environments such as high temperature and brine corrosion.

The utility model provides an anti-corrosion catalytic protective layer structure for the inner wall of a hydrogen peroxide vacuum flash tank, which relates to the technical field of protection of the inner wall of the hydrogen peroxide vacuum flash tank and comprises a hydrogen peroxide vacuum flash tank body, a tank wall lining layer is arranged at the inner side end of the hydrogen peroxide vacuum flash tank body, and the inner wall of the tank wall lining layer is provided with an anti-corrosion catalytic protective layer. An anti-corrosion lining surface layer is arranged on the outer surface of the tank wall lining layer, a polyketone resin lining interlayer is tightly attached to the inner side of the anti-corrosion lining surface layer through a PVDF polymerization layer, the inner side face of the polyketone resin lining interlayer is seamlessly connected with an anti-corrosion lining layer, and the anti-corrosion lining layer comprises a stainless steel layer and a corrosion inhibition blocking layer. The utility model solves the problem that the stainless steel single-layer inner wall of the existing vacuum flash tank is difficult to resist the corrosion of evaporated and concentrated high-concentration hydrogen peroxide for a long time.