232results about How to "Solving Corrosion Problems" patented technology

The utility model discloses a battery monomer, a battery device and an electric device, and belongs to the technical field of batteries. Wherein the battery monomer comprises a shell, an electrode component and a pole component, the electrode component is arranged in the shell, the shell comprises a first shell wall, the pole component is arranged on the first shell wall and comprises a pole and a clamping structure, the pole is connected with the electrode component, and the clamping structure is connected with the first shell wall; the clamping structure surrounds the pole and is insulated and hermetically matched with the pole through the insulated sealing structure, the clamping structure comprises a first clamping piece and a second clamping piece which are connected, the first clamping piece is bent towards the pole, the first clamping piece and the second clamping piece form a clamping groove for clamping the pole together, the first clamping piece comprises a first clamping part bent towards the pole, and the second clamping piece comprises a second clamping part bent towards the pole. The plurality of first clamping parts are arranged along the circumferential direction of the pole, and a discontinuous opening is formed between at least two adjacent first clamping parts, so that the problems of wrinkles, material stacking and the like after the first clamping parts are bent are favorably solved, and the reliability of the battery monomer is improved.

The invention discloses a flue gas emission continuous monitoring device and a monitoring method, and relates to the technical field of flue gas emission, the device realizes gas inlet detection and multidirectional gas inlet and gas exhaust of cleaning pipelines and parts through a U-shaped gas inlet pipe, a preheating pipe, a first gas return pipe, a first gas inlet pipe, a gas collection chamber, a condensation pipe, a liquid collection chamber and a second gas return pipe; preheating and heat preservation are achieved through air inlet and air outlet, heat preservation measurement is achieved in the heat preservation shell, pipelines and parts, interference of temperature, oil and particulate matter is effectively reduced, and the monitoring precision is improved; the laser scattering sensor is used for measuring the concentration and the particle size of particulate matters, the optical fiber measuring unit is used for monitoring other components in flue gas, and real-time monitoring and emission component analysis of the flue gas are realized by collecting released liquid and measuring substances dissolved in the liquid; the problems that smoke monitoring is easy to interfere, detection data are easy to fluctuate, and a multi-operation-mode switching technology of a detection device is lacked, so that the smoke monitoring precision is low are solved.

The invention relates to the technical field of sulfur-iodine circulating hydrogen production, in particular to a thermochemical iodine-sulfur-barium circulating hydrogen production process and a thermochemical iodine-sulfur-barium circulating hydrogen production system, which comprises the following steps: reacting excessive Ba < 2 + > with sulfuric acid in a Bunsen reaction product to obtain barium sulfate so as to obtain a first reaction mixed solution containing HI, BaSO4, H2O, BaI2 and a small amount of unreacted I2; sequentially carrying out cyclone separation, liquid removal and filter pressing to obtain a barium sulfate filter cake and a second mixed solution containing HI, H2O and BaI2; the method comprises the following steps: crushing a barium sulfate filter cake, performing high-temperature decomposition, returning gas generated by decomposition to participate in Bunsen reaction, and dissolving BaO generated by decomposition into Ba < 2 + >; and reboiling the second mixed solution to obtain hydrogen iodide steam, cooling a product obtained by decomposing the hydrogen iodide steam, carrying out gas-liquid separation to obtain hydrogen, and returning liquid obtained by gas-liquid separation to participate in the Bunsen reaction of the next cycle. Barium circulation is introduced, the process is simplified, the dosage of elemental iodine is reduced, and the cost is low.

The invention relates to the field of tubular column life dynamic prediction, in particular to a tubular column life dynamic prediction method based on corrosion logging detection, which comprises the following steps of: constructing target parameters influencing the corrosion rate of a test tubular column by utilizing a single parameter change test, and calculating the acid gas partial pressure, the liquid holdup and the fluid flow state of each monitoring point; the corrosion rate corresponding to the monitoring point is determined by adopting electromagnetic flaw detection logging, a corrosion rate prediction model is established by adopting a neural network prediction method, and future target prediction parameters are determined by predicting the gas production rate, the water production rate and the formation pressure of each year in the future; therefore, the corrosion rate of each year in the future is determined; calculating the residual wall thickness of the future year, determining an internal pressure resistance safety coefficient and an external extrusion resistance safety coefficient, determining the residual life of the to-be-predicted tubular column, and timely sending out early warning information; and transmitting the early warning information and the collected data to a terminal by using a wireless communication technology to monitor the tubular column in real time. Therefore, the dynamic performance of gas well life prediction is realized.

The invention discloses a method for regenerating a lithium iron phosphate positive electrode material from waste lithium iron phosphate battery black powder, and belongs to the technical field of waste lithium ion battery recovery. According to the method, the black powder of the waste lithium iron phosphate battery is subjected to wet leaching, a lithium iron phosphate precursor is prepared through a one-step hydrothermal method after deep impurity removal of a leaching solution, and finally modified lithium iron phosphate is prepared through high-temperature roasting. According to the method disclosed by the invention, the lithium iron phosphate positive electrode material can be regenerated only through a hydrothermal method, and lithium iron phosphate and carbon are uniformly compounded after carbonization roasting. The modified lithium iron phosphate is used as a lithium ion battery positive electrode material, the electrical property is excellent, the 0.1 C discharge specific capacity is 159.21 mAh / g, and the 1 C discharge specific capacity can reach 145.33 mAh / g. The main raw material involved in the invention comes from the waste lithium iron phosphate battery, so that the production cost of lithium iron phosphate can be effectively reduced, and waste battery resource circulation and environment-friendly utilization are realized.

The invention discloses a method for preparing a nanometer aluminum oxide coating on the surface of 310S stainless steel, belongs to the technical field of inert nanometer coating preparation, solves the technical problem of preparing a nanometer Al2O3 coating on the surface of the 310S stainless steel, and comprises the following steps: S1, pretreating a base material; s2, preparing hydroxyl active sites on the surface of the base material; s3, ALD atomic layer deposition is carried out; s4, preparing an aluminum precursor layer on the surface of the base material; s5, preparing an aluminum oxide coating on the surface of the base material; s6, the steps S4-S5 are repeated, the Al2O3 coating is prepared layer by layer, and the thickness of the Al2O3 coating is accurately controlled; and S7, high-temperature heat treatment is conducted, and the 310S stainless steel covered with the nanometer aluminum oxide coating is prepared. The uniform and compact nano Al2O3 film can be obtained on the surface of the 310S stainless steel through one-step deposition, the process is simple and efficient, the thickness of the nano Al2O3 coating is accurately controlled, the adhesive force is high, and the requirements of 310S high-temperature corrosion-resistant use working conditions are met.

The present invention provides a battery protection base plate, comprising an upper fiber reinforced resin layer, a metal plate and a lower fiber reinforced resin layer, wherein the metal plate is located between the upper fiber reinforced resin layer and the lower fiber reinforced resin layer; and the following conditions are met:. At the same time, the present invention also discloses a battery pack composite protection structure comprising the above-mentioned battery protection base plate. The battery protection base plate provided by the present invention has good impact resistance and reduces the risk of connection failure of the battery protection base plate under long-term vibration conditions.

The invention belongs to the technical field of polyurethane foam materials, and particularly relates to a modified China-hemp core powder composite polyurethane foam material which comprises the following components in parts by mass: 30-50 parts of polymer polyol, 10-40 parts of modified China-hemp core powder, 20-30 parts of a flame retardant, 1-2 parts of a catalyst, 3-4 parts of a foaming agent, 1-2 parts of a foam stabilizer, 65-80 parts of organic polyisocyanate and 0.5-1 part of white oil. The modified China-hemp core powder adopts titanium oxide modified China-hemp core powder; the invention also provides a preparation method of the foaming material. The problem of antibacterial durability of the China-hemp modified polyurethane foaming body is solved, an organic-inorganic composite antibacterial and bacteriostatic system can be formed by the titanium oxide material and the antibacterial material in the China-hemp core by utilizing the wrapping property, antibacterial and bacteriostatic properties and restorability of the titanium oxide material, and the antibacterial material is wrapped by the silica material, so that the problem of loss of the antibacterial material is effectively solved.

The invention discloses a system and method for achieving automatic temperature control of a marine urea cabin, and the system comprises a heat exchange pipe, a heating medium source, a refrigerant source, a temperature sensor and a controller. Two ends of the heat exchange pipe are respectively connected with a first header pipe and a second header pipe; the first refrigerant branch pipe and the first heating medium branch pipe are connected to the first header pipe, and the second refrigerant branch pipe and the second heating medium branch pipe are connected to the second header pipe. The first refrigerant branch pipe, the first heating medium branch pipe, the second refrigerant branch pipe and the second heating medium branch pipe are each provided with an electric valve. The temperature sensor and the electric valve are both connected to the controller. Automatic switching between heating water and cooling water is achieved, manual operation is not needed, temperature adjustment is flexible, it is ensured that the temperature of the urea cabin is controlled within the normal storage temperature range, and the operation and maintenance cost is reduced.

The invention discloses an air-water cooling heat dissipation transformer for an offshore platform, which comprises a shell and is characterized in that the transformer is arranged in the shell, a plurality of air passages are arranged in a coil of the transformer, a backpack radiator and a water cooling assembly are fixedly mounted on the outer wall of the shell, the water cooling assembly is positioned below the backpack radiator, and the top ends of the air passages are communicated with the backpack radiator; the air outlet end of the backpack radiator communicates with the bottom end of the air channel, and the water cooling assembly is arranged at the air outlet end of the backpack radiator and used for cooling hot air flowing out of the air outlet end of the backpack radiator. According to the air-water cooling heat dissipation transformer for the offshore platform, the closed circulating water path and air circulation in the transformer are adopted, the heat dissipation problem of the transformer is effectively solved, in the heat dissipation process, the transformer does not make contact with external environment air, and therefore the problem that the transformer is corroded by salt mist is solved.

The invention discloses a method for condensing and cooling ammonia gas of an ammonia still, which comprises the following steps of: 1, replacing an existing tubular ammonia dephlegmator with a double-helix plate heat exchanger, and enabling the temperature of the ammonia gas passing through the ammonia dephlegmator to reach 92 DEG C or below; 2, replacing a shell and tube ammonia condensation cooler with a double-helix plate heat exchanger, and enabling the temperature of ammonia gas passing through the ammonia condensation cooler to reach 40 DEG C or below; step 3, installing a service valve behind the two ammonia dephlegmators, communicating a pipeline behind the valve to enter two ammonia condensation coolers which are connected in parallel, and enabling the ammonia condensation coolers to be standby for each other; and step 4, changing a strong ammonia water pipeline entering the desulfurizing tower from a phi 50 316L stainless steel pipe to a phi 65 TA2 pipeline, and ensuring a gradient of 1%, so that condensed strong ammonia water and non-condensable gas can smoothly enter the desulfurizing tower. The invention relates to the field of ammonia still ammonia gas treatment, in particular to an ammonia still ammonia gas condensing and cooling method.

The invention discloses an assembly type FRP profile-concrete continuous composite beam which is mainly composed of an FRP profile main beam, a sagging moment area prefabricated concrete slab and a hogging moment area prefabricated laminated slab. Wherein the upper part of the hogging moment area prefabricated laminated plate is a large-strain FRP grid reinforced EGC top plate, the lower part of the hogging moment area prefabricated laminated plate is an FRP rib reinforced concrete bottom plate, and shear-resistant short steel bars are vertically arranged on the two; the beam sections of the FRP profile main beam are connected through FRP lap joint plates, U-shaped formwork-free comb-tooth-shaped wet joints are arranged between the plates, and the FRP profile main beam is connected with the upper prefabricated concrete slab and the laminated slab through detachable high-strength bolts. According to the structure, the characteristics of ultrahigh ductility, multi-seam steady-state cracking and higher tensile strength of a large-strain FRP grid reinforced EGC material are fully utilized, and meanwhile, the advantages of light dead weight, high strength and high elasticity of an FRP profile and the advantages of large rigidity, good stability, low construction cost and the like of a concrete wing plate are exerted; and the reliable and durable assembly type functional gradient composite beam is formed.

The invention discloses a sacrificial anode state monitoring and service life prediction method for ship cathode protection, belongs to the technical field of sacrificial anode state monitoring and service life prediction, and solves the problems that the anode protection current generated by a sacrificial anode can be reduced to a pA level at the initial stage of corrosion, and the service life of the sacrificial anode cannot be predicted under the condition that strong interference exists in an actual environment. The performance of an existing sacrificial anode detection technology cannot meet the high-precision detection requirement, so that the requirement for predicting the service life of a sacrificial anode cannot be met, and the requirement for judging the early corrosion trend cannot be met. The method comprises the steps that a plurality of node monitoring detection boxes are used for detecting the anode potential of a sacrificial anode connected with a cathode, and protection current between the cathode and the sacrificial anode is detected in a multi-range mode and stored; and the monitoring substation is used for monitoring the state of the sacrificial anode and predicting the service life of the sacrificial anode based on the anode potential and the protection current detected by the plurality of node monitoring detection boxes. The method is used for sacrificial anode state monitoring and life prediction.

The utility model provides a seamless splicing type aluminum ceiling moistureproof structure which comprises a ceiling body, the ceiling body comprises a substrate layer, a first functional layer and a second functional layer, the first functional layer comprises an epoxy resin coating and a polyurethane coating, the second functional layer comprises a fluorocarbon coating and a nanometer waterproof coating, and the nanometer waterproof coating is a polyurethane coating. By arranging the first functional layer comprising the epoxy resin coating and the polyurethane coating, the epoxy resin coating has excellent waterproof and moisture-proof performance, can effectively prevent water from permeating, further has good adhesive force and chemical corrosion resistance, and can protect the surface of the aluminum material from being damaged by oxidation and chemical corrosion; the epoxy resin coating is smooth in surface and easy to clean and maintain, and the polyurethane coating has excellent moisture-proof and waterproof performance, has elasticity and wear resistance, can adapt to thermal expansion and cold contraction changes of the aluminum ceiling body and is not prone to cracking and falling off.

The invention provides a method and a system for energy-saving and efficient production of concentrated ammonia water from coking residual ammonia water. The system comprises an ammonia still (1), an ammonia washing tower (2), a desorption tower (3), a vapor compressor (4), a wastewater evaporator (5), a division evaporator (6), a condensation evaporator (7), an ammonia still wastewater pump (8), an ammonium phosphate circulating pump (9), an ammonium phosphate feeding pump (10), a wastewater circulating pump (11), an ammonium phosphate circulating liquid cooler (12), an ammonium phosphate pregnant solution heat exchanger (13), an ammonia still wastewater heat exchanger (14) and a stronger ammonia water cooler (15). And a heater (16). The invention also discloses a method for energy-saving and efficient production of stronger ammonia water from coking residual ammonia water. The energy-saving and efficient concentrated ammonia water production system for coking residual ammonia water is simple, energy-saving and efficient, and a concentrated ammonia water product prepared by adopting the system can meet related standard requirements.

The invention provides a water pan assembly, an air duct type indoor unit and an air duct machine, the water pan assembly at least comprises a first water pan and a second water pan, a supporting protrusion used for placing an evaporator is arranged in the first water pan, the supporting protrusion is in a shape with the middle higher than the two sides gradually lowered, and at least the supporting protrusion is provided with a drainage seam; the second water pan is used for supporting the first water pan and collecting condensate water dripping from the drainage seam; the evaporator can be placed at a high position, and meanwhile the problem that the evaporator is corroded due to being soaked by accumulated water is effectively solved.

The invention discloses a preparation method of a membrane electrode for preparing synthesis gas through electrolyte-free CO2 electroreduction. The preparation method comprises the following steps: uniformly mixing transition metal salt, a hydroxyl-rich carbon material and a nitrogen-rich material to obtain an atomic-scale dispersed transition metal catalyst; adding the transition metal catalyst into an electrode slurry dispersing agent to obtain mixed slurry, and spraying the mixed slurry on carbon paper to obtain the gas diffusion electrode, placing a polymer film on the gas diffusion electrode, performing hot press molding to obtain a composite material, and laminating the composite material with a proton exchange membrane to obtain the membrane electrode. The membrane electrode prepared by the preparation method can be used for efficiently electrically reducing CO2 in an electrolyte-free ultrapure water electrolyte.

The invention discloses a butt welding connection structure of a steel-plastic composite pipe and a connection method of the butt welding connection structure, relates to the technical field of composite pipe butt joint structures, and is mainly used for solving the problem that leakage risks exist in common steel-plastic composite pipe connection modes. According to the main structure, adjacent outer-layer steel pipes are connected in a butt welding mode through radial flaring sections which are arranged at the ends of the outer-layer steel pipes and are of an integrated structure with the outer-layer steel pipes; the end parts of the adjacent inner-layer plastic pipes are connected, a filler cavity is formed between the end parts of the adjacent inner-layer plastic pipes and the radial flaring sections which are in butt welding connection, and threaded holes communicated with the filler cavity are formed in the radial flaring sections. The invention provides a butt welding connection structure of a steel-plastic composite pipe and a connection method of the butt welding connection structure, which can ensure the loading capacity and the connection reliability of a connection part while completely preventing a medium in an inner-layer plastic pipe from being in contact with an outer-layer steel pipe, and increase the applicable working condition range of the product while avoiding the leakage of the medium.

The utility model discloses a butyl acrylate reaction system with a spraying function, and belongs to the technical field of butyl acrylate preparation. According to the technical scheme, the device comprises a dehydrating tower, a first esterification reactor and a second esterification reactor which are connected through pipelines, the dehydrating tower is provided with a raw material butanol feeding pipeline, a catalyst reflux pipeline, a tower top discharging pipeline, a first evaporator feeding pipeline and a second evaporator feeding pipeline, one end, far away from the dehydrating tower, of the tower top discharging pipeline is connected with a tower top liquid receiving tank, and a tower top reflux pipeline is further arranged between the dehydrating tower and the tower top liquid receiving tank; a dehydrating tower washing liquid reflux pipeline is also arranged between the dehydrating tower and the first esterification reactor; the tower top liquid receiving tank is connected with a liquid receiving tank water phase water outlet pipeline; and the first esterification reactor is communicated with the second esterification reactor through a first reactor discharge pipeline. According to the utility model, the recycling of the catalyst is realized, low-temperature water entering the esterification reactor is reduced, and the steam consumption is reduced.

The utility model discloses an assembly tool of a blanking cap, the assembly tool comprises a first installation rod and a second installation rod, one end of the first installation rod is provided with a first insertion end, and the first insertion end is suitable for being inserted into an assembly hole of the blanking cap so as to enable the blanking cap to be assembled into a process hole of a vehicle body; one end of the second mounting rod is provided with a second insertion end, the peripheral wall of the second mounting rod is provided with a pressing plate, the second insertion end is suitable for being inserted into the assembly hole, and the pressing plate is suitable for pressing and abutting against the blanking cap so that the blanking cap can be attached to the automobile body. According to the assembly tool, the first mounting rod and the second mounting rod are arranged, so that the problems that the blanking cap is difficult to assemble and not in place in the assembly process can be solved, the vehicle corrosion problem caused by water leakage and gas leakage is effectively prevented, and the NVH problem can also be effectively solved.

The utility model discloses a driving assembly for grinding and cleaning small parts, which belongs to the technical field of small part conveying and comprises a rotating shaft rotationally connected to the outer wall of a box. The rotating shaft is fixedly connected with a driving magnetic wheel; one end, close to the rotating shaft, of the conveying shaft extends out of the box body and is fixedly connected with a driven magnetic wheel; the driving assemblies such as the rotating shaft, the driving magnetic wheel and the driven magnetic wheel are designed on the outer side of the box body, so that during later maintenance, the driving assemblies do not need to enter the box body, a worker can perform maintenance directly on the outer side of the box body quickly and conveniently, meanwhile, the driving assemblies are designed on the outer side of the box body, and it is avoided that during grinding and cleaning, the grinding efficiency is greatly improved. Liquid is splashed to the surface of the driving assembly, the corrosion problem is avoided, and the working life is ensured.

The utility model provides a spraying and humidifying device of chemical supply equipment, which comprises a high-pressure spray head, a pure water inlet for feeding pure water, a nitrogen inlet for feeding high-pressure nitrogen and a water outlet for discharging excessive water, wherein the side surface of the high-pressure spray head is provided with a pure water inlet for feeding pure water, the side surface of the high-pressure spray head is provided with a nitrogen inlet for feeding high-pressure nitrogen, and the side surface of the high-pressure spray head is provided with a water outlet for discharging excessive water; a nozzle is formed in the top of the high-pressure spray head, an upper shell is arranged at the top of the high-pressure spray head, and a spray joint is arranged on the upper shell. The device improves the humidity control effect.

The application discloses a kind of laser cutting equipment and method for metal processing, including base, the outside of the base is provided with wheel rotation mechanism, the wheel rotation mechanism includes rotating roller, the shaft end of the rotating roller is connected with support plate, the outer surface of the support plate is fixedly connected with the outer surface of base, the outer camber surface of the rotating roller is opened with clamping groove at equal angle, the outer surface of the rotating roller is fixedly connected with telescopic link on both sides, the output end of telescopic link on both sides is fixedly connected with connecting plate, the body of the connecting plate is rotatably connected with two rotating rods, one end of one rotating rod is fixedly connected with circular platform, relate to cutting equipment technical field, solve the problem that actual processing efficiency is reduced, power consumption is increased when existing laser cutting equipment is used, since only single metal pipe can be carried during cutting process, metal pipe cannot be accurately blanked due to not being provided with guiding and buffering measures, and metal pipe cannot be avoided to be damaged by collision.

The embodiment of the invention discloses an earphone charging box control method and device, a charging box and a storage medium, and is used for controlling whether the charging box and an earphone are in a power-on state or not according to the state that the earphone enters and exits the charging box, so that the charging box cannot be in a power-on state for a long time, the power consumption of the charging box can be reduced, and the charging efficiency is improved. The problem of corrosion caused by long-term electrification of the charging box can be solved to a certain extent. The method is applied to the charging box. The method comprises the steps that the current magnetic induction intensity of the charging box is detected; according to a preset magnetic induction intensity threshold value and the current magnetic induction intensity, determining a charging box access state of the earphone; and controlling whether the charging box and the earphone are in a power-on state or not according to the state of the earphone entering and exiting the charging box.

The application discloses a water pan structure and a heat pump swimming pool equipment. The water pan structure comprises a first water pan, at least two limiting pieces and a fixing piece. The first water pan can be used for mounting two finned heat exchangers. Two limiting pieces are arranged on one side of the first water pan, and the two limiting pieces are respectively located at two end corners of the first water pan. The limiting pieces are used for limiting one side of end plates of the finned heat exchangers. The fixing piece is arranged on the other side of the first water pan, and the fixing piece is located on the center line of the first water pan. The fixing piece can be fixed with the other side of the end plates of the two finned heat exchangers. The application cancels the traditional positioning slot design, completely eliminates the condensate leakage channel caused by the slot gap, and can accurately position and fix the finned heat exchanger, thereby improving the assembly efficiency.

The invention relates to the technical field of waste heat utilization, in particular to a hazardous waste incineration waste heat power generation system which comprises a shell, an air bag and a power generation unit and further comprises a drainage pipe, a water pump, a lower flow pipe, a flow guide pipe, an upper flow pipe, a heat exchange pipe, a flow adjusting assembly and a constant pressure assembly. The lower flow pipe is connected to the other end of the drainage pipe, the flow guide pipe array is connected to the lower side of the air bag, the multiple upper flow pipes are connected with the multiple flow guide pipes correspondingly, the heat exchange pipe array is connected to the lower sides of the upper flow pipes, the flow adjusting assembly is connected with the heat exchange pipes, and the constant pressure assembly is connected with the flow adjusting assembly. A water inlet is formed in the lower side of the heat exchange pipe, a water outlet is formed in the upper side of the heat exchange pipe, the flow of water flow at the water inlet and the water outlet in the heat exchange pipe is changed, then the pipeline is twisted within a limited range, and then the purpose of removing acidic condensate water is achieved.

The invention provides a chlorine compressor intercooler cooling device which comprises an intercooler and further comprises a pure water circulating pipeline, the pure water circulating pipeline exchanges heat with an intercooler cooling pipeline, and after the pure water circulating pipeline exchanges heat with the intercooler cooling pipeline, pure water is cooled through a closed cooler and then returns to be recycled. According to the invention, the energy consumption is reduced, and the safety is improved.

The invention provides an electrolyte and a secondary battery. The electrolyte comprises an organic solvent, a lithium salt, a film-forming additive and a metal corrosion inhibitor, the mass ratio of the metal corrosion inhibitor in the electrolyte is 0.001-2%; the metal corrosion inhibitor is a benzotriazole compound and / or a sulfonate compound; the chemical formula of the sulfonate compound is R-SO3M, R is C1-C16 straight-chain alkyl or phenyl-substituted C1-C12 straight-chain alkyl, and M is selected from any one of Li, Na and K. The invention further discloses a preparation method of the sulfonate compound. By adding the metal corrosion inhibitor according to the type and the mass ratio into the electrolyte, a protective layer can be formed on the surface of the steel shell of the cylindrical battery, so that the contact between acidic byproducts in the battery and the surface of the steel shell is isolated, the corrosion of the steel shell is inhibited, and the storage performance, the cycle life and the safety of the battery are further improved.

The invention relates to the technical field of hydrogen-resistant coatings, and provides a surface treatment method of a threaded connecting piece and the threaded connecting piece. The threaded connecting piece comprises a pipe body and a coupling which are matched with each other, and the surface treatment method comprises the steps that the pipe body and the coupling are placed into a tubular furnace, a hydrogen-resistant material is deposited on the thread surface of an internal thread of the coupling and the thread surface of an external thread of the pipe body, and the surfaces of the internal thread and the external thread are provided with hydrogen-resistant coatings; and depositing a self-lubricating material on the surface of the hydrogen-resistant coating to obtain the threaded connecting piece with the hydrogen-resistant self-lubricating composite coating. The hydrogen-resistant self-lubricating composite coating not only solves the problem of corrosion of a special threaded pipe in a hydrogen environment, but also effectively meets the requirements of thread gluing resistance and shaft sealing integrity, and the coating is low in production cost, high in controllability, suitable for industrial production and suitable for the working condition environment of an underground hydrogen storage library.

The invention belongs to the field of chemical industry, and relates to an anti-corrosion process and device for hydrolysis of methyl acetate and refining of acetic acid in the process of recovering polyvinyl alcohol mother liquor. The anti-corrosion device comprises a methyl acetate concentration device, a methyl acetate dealdehyde device, a methyl acetate hydrolysis device, a hydrolyzate separation device, an acetic acid refining device and an isopropyl acetate recovery device. The methyl acetate hydrolysis and acetic acid refining process mainly comprises methyl acetate concentration, methyl acetate dealdehyde, methyl acetate hydrolysis, hydrolyzate separation, acetic acid refining and isopropyl acetate recovery. The ability to remove halogen-containing impurities is enhanced by arranging a mass transfer unit (i.e., a packing section) on the upper part of the side sampling port of the hydrolysis tower; by adding a precision filter, the broken resin entrained in the hydrolyzate is filtered, and the broken resin with sulfonic acid groups is prevented from entering the acetic acid refining system. The corrosion problem of acetic acid refining equipment is fundamentally solved, the problem of equipment corrosion in the acetic acid refining process is significantly solved, and the life of key equipment is extended by 1 to 5 times.