261 results about "Hydrogen permeation" patented technology

Provided is a fuel cell aging prediction method, a system thereof and a medium. The method includes the following steps: acquiring operation parameters and calculation parameters of a fuel cell corresponding to each historical moment in a historical time period, where the calculation parameters include a stack voltage, active area and a hydrogen permeation current; carrying out calculation based on the calculation parameters corresponding to the historical moment to obtain a mixed aging index corresponding to the historical moment; taking the operation parameters and the mixed aging index corresponding to each historical moment in the historical time period as inputs, and predicting the mixed aging index corresponding to the prediction moment by a mixed aging index prediction model.

The invention relates to the technical field of computer-aided engineering, in particular to an integrated design method for a three-dimensional simulation model of spare and accessory parts. The method comprises the following steps: obtaining a part structure drawing, and carrying out part interference analysis to obtain part interference data; reconstructing an assembly path according to the part interference data to obtain assembly path data; constructing a part three-dimensional simulation model according to the assembly path data; performing fatigue simulation according to the three-dimensional simulation model of the spare part to obtain fatigue life data; performing fracture area analysis based on the fatigue life data to obtain part fracture area data; performing grain boundary cracking detection according to the part fracture area data to obtain grain boundary cracking data; and performing grain boundary hydrogen permeation detection according to the grain boundary cracking data to obtain grain boundary hydrogen permeation data. Based on the computer-aided engineering technology, the accuracy of part structure design and the reliability of service life prediction are improved.

The invention belongs to the technical field of petroleum refining, and relates to a high-purity hydrogen recovery process for improving denitrification efficiency based on a PSA (Pressure Swing Adsorption) device, which comprises the following steps: carrying out primary adsorption impurity removal after pretreatment and pressure regulation on raw material gas, carrying out gas-liquid separation, pretreatment and pressure regulation on the obtained hydrogen-rich gas, and then carrying out membrane separation; the generated hydrogen-rich permeated gas is subjected to pressure regulation and then is sequentially input into a second-stage PSA device and a third-stage PSA device for further adsorption and purification, and finally finished hydrogen with the purity not lower than 99.9% is obtained. The membrane separation technology is adopted for selective separation of hydrogen and nitrogen, the membrane separation unit is arranged at the outlet of the first-stage PSA device, nitrogen is removed from the source, meanwhile, desorbed gas of the third-stage PSA device and retention gas of the membrane separation unit are combined for combustion, nitrogen accumulation in the system is avoided, the nitrogen circulation amount in the system is reduced, and the energy consumption of the system is reduced. The hydrogen recovery rate can be effectively improved while the adsorption efficiency is improved, the process is simple, the investment cost is low, the implementation period is short, and remarkable economic benefits and process advantages are achieved.

The invention relates to the technical field of hydrogen energy conveying and material performance testing, in particular to a testing structure for hydrogen permeation testing in a high-pressure gas-phase hydrogen environment and an installation method and application of the testing structure. The testing structure comprises a sample body and an insulation sealing assembly, and the sample body is of a double-step disc structure; the uppermost edge of the first sealing insulation assembly is flush with the upper end face of the cylindrical platform, the sample body is installed on the inner side of the first sealing insulation assembly in a matched mode, the second sealing insulation assembly is in a shape with an upward opening, and the first sealing insulation assembly is installed in the second sealing insulation assembly in a matched mode. The test surface of the sample body of the test structure and the gas main flow keep a consistent flow velocity field, and when the test structure is used for testing, the permeation behavior of the hydrogen flow on the material surface can be truly reflected; all the clamping and conducting structures are arranged outside the pipe wall of the test pipeline or at the left part of the sample body, so that flow field disturbance is prevented from being introduced into a main airflow path.

The invention belongs to the technical field of metal material and coating performance detection, and particularly relates to a high-pressure hydrogen permeation testing device and method.The testing device comprises a gas phase system and an electrochemical testing system, and the gas phase system comprises a high-pressure kettle, a hydrogen cylinder, a nitrogen cylinder and a vacuum treatment device; the autoclave is sealed and communicated with the hydrogen cylinder, the nitrogen cylinder and the vacuum treatment device; a first test port is formed in the upper part of the autoclave; the electrochemical testing system comprises an electrochemical workstation and an electrolytic tank; the electrolytic tank is connected to the upper part of the autoclave; the electrolytic tank is provided with a reference electrode and an auxiliary electrode, the lower part of the electrolytic tank is provided with a second test port, and the first test port and the second test port are connected with closed rubber rings and jointly clamp a sample to be tested through the closed rubber rings; the electrochemical workstation is electrically connected with the auxiliary electrode, the reference electrode and the to-be-tested sample, so that the service condition of the to-be-tested sample can be accurately simulated, the hydrogen permeation process in the actual working condition can be more truly reflected, and the accuracy of a hydrogen permeation test experiment is improved.

According to the efficient and powerful cleaning system and method for the stainless steel cold-rolled steel strip, through cooperation of an electrolytic cleaning unit (the current density is 18-200 A / dm < 2 >), a multi-stage coupling unit (alkali spraying, electrolysis, high-pressure water scrubbing and air purging) and a dynamic control unit (current self-adaption based on roughness Rz), the efficient and powerful cleaning of the stainless steel cold-rolled steel strip is achieved; the oil stain stripping rate is not less than 99%, the hydrogen permeation amount is reduced by 67%, the residual alkali liquor is not more than 0.5 g / m < 2 >, and Ra is not more than 0.5 mu m. And the current efficiency is improved to 85% by adopting a bipolar electrode and a vertical injection design, the surface quality is strengthened by combining a hydrophobic roller and passivating treatment, and the device is suitable for high-speed continuous production.

The invention belongs to the technical field of hydrogen sulfide stress corrosion resistance detection of oil well pipes, and particularly relates to a method for testing the influence of anodic dissolution in saturated hydrogen sulfide on stress corrosion fracture of an oil well pipe, which comprises the following steps: respectively carrying out slow strain rate tensile tests in a saturated hydrogen sulfide environment and a nitrogen environment to obtain a stress-strain curve of an oil well pipe sample; measuring a hydrogen permeation curve of the oil well pipe sample in the saturated hydrogen sulfide environment; carrying out fast and slow sweep potential polarization curve test and hydrogen permeation curve test on the oil well pipe, and carrying out hydrogen charging-slow stretching test on the oil well pipe under the cathode hydrogen charging potential corresponding to the steady-state hydrogen permeation current density; and according to the damage degree of the saturated hydrogen sulfide environment to the mechanical properties of the oil well pipe, the minimum influence degree of hydrogen in the saturated hydrogen sulfide environment to the stress corrosion fracture of the oil well pipe is determined by combining the damage degree of hydrogen separated out from the cathode reaction to the mechanical properties of the oil well pipe. The device has the advantages of simplicity in operation and accurate measurement result.

The invention relates to the technical field of natural gas transportation safety, in particular to a hydrogen embrittlement risk online monitoring system and method for a hydrogen-doped natural gas pipeline based on multi-parameter fusion, and the system comprises a sentry sensing unit which adopts a metal short pipe which is the same as a to-be-monitored hydrogen-doped natural gas main pipeline in property, material, process, wall thickness and service history, an internal circulating medium is kept consistent with the main pipeline; the risk sensor is provided with a multi-parameter sensor to obtain risk sensing parameters including hydrogen permeation current, pipe wall micro-strain and temperature signal parameters; the signal processing unit is connected with the sentry sensing unit, receives the risk sensing parameters and analyzes and generates hydrogen embrittlement risk indexes through a risk analysis model; and the risk warning unit is connected with the signal processing unit, and triggers a danger prompt signal when the hydrogen embrittlement risk index is greater than a preset safety index. The method has the effect of meeting the danger monitoring effectiveness of safe operation of the hydrogen-doped natural gas pipeline.

The invention belongs to the technical field of PEM water electrolysis hydrogen production, and provides a control method and system of PEM water electrolysis hydrogen production equipment. The method comprises the following steps: extracting a differential pressure oscillation signal and analyzing to obtain a differential pressure unbalance area; through associated risk modeling of the pressure difference and the permeability, outputting a risk level for predicting hydrogen permeation; executing a differential intervention strategy, extracting effective inhibition characteristics, and constructing a two-dimensional evaluation domain to judge whether hydrogen permeation is completely inhibited or not; and if the hydrogen is not completely inhibited, extracting and screening a hydrogen reverse migration path to obtain a response isolation path and a permeation duration coefficient, and triggering equipment safety isolation and inerting response control according to the permeation duration coefficient. The control system comprises an unbalance analysis module, a penetration analysis module, an inhibition judgment module, a path extraction module and a response control module. According to the invention, risk assessment and efficient safety control of the PEM water electrolysis hydrogen production equipment can be realized, and the safety and stability of equipment operation are improved.

The application relates to the technical field of hydrogen energy transportation and material performance testing, and relates to a test structure for hydrogen permeation testing under a high-pressure gaseous hydrogen environment, a mounting method and application thereof. The test structure comprises a sample body and an insulating sealing assembly, and the sample body is in a double-stage disc structure. The uppermost edge of the first sealing insulating assembly is flush with the upper end surface of the cylindrical platform, and the sample body is matched with the inner side of the first sealing insulating assembly for installation. The second sealing insulating assembly is in an open-upward shape, and the first sealing insulating assembly is matched with the second sealing insulating assembly for installation. The test surface of the sample body of the test structure is kept consistent with the flow field of the gas main stream, and when the test structure is used for testing, the permeation behavior of the hydrogen flow to the material surface can be truly reflected. All clamping and conducting structures are arranged on the outer part of the pipe wall of the test pipeline or the left part of the sample body, so that flow field disturbance is avoided in the main path of the gas flow.

The invention discloses a hydrogen brittleness performance evaluation method for a hydrogen transport pipeline, which comprises the following steps: obtaining the average hydrogen concentration in a sample through a high-pressure hydrogen permeation test of a wafer sample, and obtaining the hydrogen concentration and hydrogen diffusion coefficient of the surface of the sample under a specific electrochemical hydrogen charging condition through an electrochemical hydrogen charging test of the wafer sample; a finite element analysis model of a target sample is established to simulate the change relation of the total amount of hydrogen atoms in the target sample along with time under the electrochemical hydrogen charging condition, and the electrochemical hydrogen charging time equivalent to the high-pressure gaseous hydrogen charging is obtained by comparing the high-pressure gaseous hydrogen charging with the electrochemical hydrogen charging. The target sample is charged with hydrogen through an electrochemical hydrogen charging method, and finally the hydrogen embrittlement performance of the target sample is obtained through a hydrogen embrittlement performance test. According to the method, simple finite element simulation and electrochemical hydrogen charging are combined, high-pressure gaseous hydrogen charging which is complex, low in efficiency and high in danger is replaced, and the detection time of the hydrogen embrittlement performance test of the hydrogen charging pipe is shortened.

The invention belongs to the technical field of hydrogen-resistant coatings, and particularly relates to a hydrogen-resistant coating as well as a preparation method and application thereof. The hydrogen-resistant coating comprises an alpha-Al-based solid solution layer on the substrate, Al2O3 micro-nano particles and SiO2 micro-nano particles which are dispersed and distributed in the alpha-Al-based solid solution layer, and an Al2O3 thin film layer covering the surface of the alpha-Al-based solid solution layer. The compact structure of the alpha-Al-based solid solution can block the permeation of hydrogen atoms, enhance the interface between phase particles and a matrix, prolong the diffusion path of the hydrogen atoms in the material, increase the diffusion barrier and serve as a trap for capturing hydrogen, and the composite coating has the dual effects of capturing and blocking hydrogen, so that the hydrogen permeability is further reduced. When the coating is slightly damaged, the damaged surface can be oxidized again to form Al2O3, and the self-repairing capacity is achieved. The composite coating is prepared by adopting a braze coating method, and has the advantages of simple preparation method, low cost, capability of realizing industrial batch production and the like.

The invention provides a quantitative detection method for the average pressure of hydrogen in a PEM electrolyzed water cathode catalyst layer, and relates to the technical field of hydrogen production by electrolyzed water. The quantitative detection method comprises the following steps: carrying out a hydrolysis reaction in a PEM electrolytic cell, and calculating a hydrogen permeation flux N1 and a corresponding back pressure P1 under an electrolysis working condition; in another PEM electrolytic cell with the same structure, hydrogen is introduced into the cathode side, back pressure is applied to a cathode opening, meanwhile, inert gas is introduced into the anode side, an anode product channel is continuously purged, and the hydrogen permeation flux N2 under the hydrogen introduction working condition is calculated; gradually adjusting the back pressure under the hydrogen feeding working condition, repeating the step of testing the permeation flux under the hydrogen feeding working condition to obtain the hydrogen permeation flux under different back pressures, and drawing an N2-P2 curve; and determining a corresponding hydrogen back pressure value P2 when N1 is equal to N2, and calculating according to a formula deltaP = P2-P1 to obtain the average hydrogen pressure deltaP.

The invention relates to the technical field of fuel cell monitoring and life prediction, in particular to a fuel cell life prediction method combining mechanism and data driving, which comprises the following steps: calculating reversible potential of a fuel cell through a Nernst equation, and establishing a theoretical output voltage model by combining three voltage losses of activation, concentration difference and ohm; acquiring historical data of voltage attenuation under actual operation conditions, and determining a life end voltage threshold value; training historical data by using a time sequence algorithm, identifying an aging rule function of key parameters (ohmic impedance, hydrogen permeation current density, exchange current density and limiting current density), and evaluating parameter identification precision through RMSE; and substituting the parameter aging function into the voltage model to predict future voltage, and when a predicted value is lower than a life end threshold for the first time, calculating the remaining service life. According to the method, the electrochemical mechanism and the data driving technology are fused, and the prediction accuracy is remarkably improved.

The invention provides a method and a device for testing hydrogen doping of a buried steel pipe under a cathode protection condition. The method and the device solve the technical problem that an internal hydrogen permeation-external hydrogen adsorption synergistic effect mechanism faced by a buried pipeline cannot be reflected in an existing test. The method comprises the following steps: establishing a dual test environment under a cathode protection condition, forming a control group and an experimental group of a corrosion test piece to be tested, deploying the control group in a single soil environment, and deploying the experimental group in internal and external hydrogen environments; the power-on potential and the power-off potential are continuously monitored in the dual test process; quantitative comparison of key parameters of the control group and the experimental group is formed according to the double test periods; and constructing a multiple regression model according to the key parameters in combination with potential correction data to quantify the correlation between the corrosion rate and the hydrogen embrittlement sensitivity. The double-environment coupling effect in the actual operation of the pipeline is synchronously simulated, and the diffusion path difference of hydrogen atoms in metal lattices and the influence of double-environment superposition on the corrosion rate are more truly reflected.

The utility model relates to the field of electrolyzed water, and provides a catalyst coated membrane structure, a membrane electrode and a device for producing hydrogen by electrolyzing water, the catalyst coated membrane structure comprises a proton exchange membrane, a cathode catalyst layer and an anode catalyst layer, the cathode catalyst layer and the anode catalyst layer are respectively arranged on two sides of the proton exchange membrane, and the anode catalyst layer is arranged on the proton exchange membrane. And a hydrophobic hydrogen-resistant layer is arranged between the proton exchange membrane and the cathode catalyst layer. The method has the advantages that the hydrogen transmittance is reduced, so that the concentration of hydrogen in anode side oxygen is reduced, the explosion risk is reduced, and the safety coefficient during operation of the electrolytic cell is improved. In addition, expensive metal and metal oxide catalysts are not used in the scheme, so that the cost of the catalyst coating film is reduced while the hydrogen resistance effect is achieved. And when the hydrogen passing ability is reduced, normal proceeding of other mass transfer is guaranteed, the water electrolysis hydrogen production device still has high performance under the condition that the hydrogen content in the anode side oxygen is low, and the safety of an electrolytic cell during operation is improved.

Provided are: a hydrogen separation filter which has a high hydrogen permeation rate and which prevents or reduces separation between layers; and a method for producing the hydrogen separation filter. The hydrogen separation filter includes a porous substrate and a palladium layer provided on the porous substrate. The grain boundary number density observed in a cross-sectional secondary electron image of the palladium layer is 1-5 grains / [mu] m. A method for manufacturing a hydrogen separation filter includes forming a palladium layer on a porous base material by a sputtering method while keeping the temperature of the porous base material at 300-600 DEG C.

The presently disclosed methods provide for preparing a stable hydrophobic self-assembled monolayer (SAM) coating, that includes preparing a SAM solution by combining a SAM compound with an initial solvent and an additional solvent and mixing, in a sealed container, the SAM solution at a first fixed temperature at a constant rotational speed for a first fixed time interval. The SAM coating is then prepared by treating a substrate to achieve pristine state, and heating the substrate at a second fixed temperature for a second fixed time interval. Then within a sealed container, immersing the substrate in the SAM solution for a third fixed time interval. Following the completion of the third fixed time interval, the substrate is removed from the sealed container and treated with the initial solvent and the additional solvent to remove excess SAM material, and heated at a third fixed temperature.

The invention relates to the technical field of electrochemical hydrogen permeation devices, in particular to a thermodynamic coupling electrochemical hydrogen permeation device and a use method thereof.The thermodynamic coupling electrochemical hydrogen permeation device comprises a device body, a sample, an electrochemical workstation, a galvanostat and a data collection unit, and one side face of the sample is plated with nickel; the device body is internally provided with a cavity body, the sample is detachably mounted on the device body, the sample divides the cavity body into a cathode chamber and an anode chamber which are horizontally and oppositely arranged and mutually closed, the cathode chamber contains a 0.1 mol / L hydrogen chloride solution, and when the device is used, the sample is arranged between the cathode chamber and the anode chamber; under the action of a constant-temperature water circulation system, the solution in the anode chamber is circularly heated, then the solution in the cathode chamber is pressurized, so that the solution in the anode chamber is in a constant-temperature state, sample data are measured through an electrochemical workstation and a galvanostat, and the metal hydrogen permeation test at high temperature and high pressure is realized.

The invention provides a hydrogen-containing normal saline high-tightness vacuum hydrogen locking packaging preparation method, which belongs to the technical field of medical liquid packaging, and comprises the following steps: pressurizing prepared hydrogen by using a hydrogen booster pump so as to store high-pressure hydrogen; high-pressure hydrogen is rapidly filled into the high-pressure pressure tank to permeate into the single bottle of normal saline, the residual hydrogen is recycled for cyclic utilization, bottled hydrogen-containing normal saline is obtained and put into a composite aluminum foil bag to be subjected to vacuumizing treatment and heat sealing treatment, a high-sealing-performance vacuum hydrogen locking aluminum foil bag packaging piece is obtained, and a finished product is detected. And quickly freezing qualified products, and refrigerating and storing the qualified products to complete hydrogen locking preparation. High-pressure hydrogen permeates into a single bottle of normal saline, the traditional hydrogen permeation period of several hours is shortened to dozens of seconds, the composite aluminum foil bag is vacuumized and subjected to heat sealing treatment, hydrogen escape is effectively inhibited, the quality guarantee effect is remarkable, the process operation is simple, the hydrogen is recycled, the cost is saved, and the method is suitable for mass production.

A multilayer coating (100) for a metal piece (10), in particular a turbomachine component, more particularly a turbomachine impeller, comprises: a first layer (20) applied on at least a portion of the metal piece (10) and having a hydrogen diffusion coefficient (measured by a hydrogen permeation test) of less than 10 <-7 > m2 / s even when subjected to stress; and a second layer (30) applied on top of the first layer (20) and exposed to a process fluid comprising hydrogen. The second layer (30) includes an oxide selected between aluminum oxide (Al2O3), titanium dioxide (TiO2), and silicon dioxide (SiO2). The first layer (20) and the second layer (30) may be applied at temperatures less than 500 DEG C according to various deposition process techniques.

The application discloses a modified nitrile rubber sealing material resistant to hydrogen permeation damage and a preparation method, and belongs to the field of high polymer rubber sealing materials.The material comprises, in terms of weight parts, nitrile rubber 100 parts, composite nylon 20-35 parts, exfoliated organic montmorillonite 5-15 parts, nano hydrogen-resistant filler 3-8 parts and the like.By introducing the composite nylon as an "inlaid frame", cooperating with the "labyrinth" barrier effect of the exfoliated montmorillonite and the adsorption / quenching effect of the nano filler, a "lamellar barrier-interface anchoring" trinity protection network is constructed, hydrogen permeation and damage are inhibited from the dual mechanisms of physical barrier and chemical adsorption.The preparation adopts a two-stage low-temperature mixing process, the nylon is first blended with the rubber at low temperature, and then the remaining fillers are added at high temperature to ensure dispersion.The material prepared by the method has low hydrogen permeation rate and excellent mechanical properties, and is suitable for sealing elements of hydrogen conveying pipelines.

Provided is a method for evaluating the delayed fracture characteristics of a metal material, the method being capable of accurately evaluating delayed fracture characteristics caused by hydrogen entering the inside of a metal material due to atmospheric corrosion in which a chloride is a dominant factor of corrosion.　This method for evaluating the delayed fracture characteristics of a metal material carries out, at least one time, a process involving: a chloride adhesion step (A) in which droplets of a chloride-containing aqueous solution are adhered to an evaluation surface of a metal material so as to achieve a predetermined adhesion amount of a chloride; and a corrosion step (B) in which a cycle having a predetermined drying step (b1), a wetting step (b2), a transition step (b3), and a transition step (b4) is regarded as one cycle, and the cycle is performed at least one time, wherein, regarding the distribution of the droplets on the evaluation surface of the metal material in at least the first chloride adhesion step (A), the average contact area of the droplets is at least 0.1 mm2 and less than 3.0 mm2, the area ratio of the total contact area of the droplets to the area of the evaluation surface is 40-80%, and the standard deviation of the contact area of the droplets is at most 3.0 mm2.

The present application discloses a composite coating for hydrogen pipelines and a preparation method thereof. The composite coating for hydrogen pipelines includes a hydrogen barrier base layer; the components of the hydrogen barrier base layer include a nano-micron multi-scale flaky filler with a crystalline phase and a semi-crystalline polymer; the multi-scale flaky filler is the hydrothermal reaction product of an inorganic flaky filler and hydrotalcite; and the composite coating effectively solves the problem that current organic or inorganic hydrogen barrier coatings cannot provide long-term protection or have poor hydrogen permeation resistance.

The invention relates to the technical field of solar heat utilization, and discloses a solar methanol reforming and hydrogen separation integrated spiral hydrogen production system which comprises a reaction tube, a spiral hydrogen selective permeable membrane, a feeding system, a sweeping pipeline and the like. The temperature and flow of the feeding system and the sweeping system can be adjusted in real time according to the solar irradiation change, the reaction tube outlet exhaust temperature, the hydrogen yield and the catalyst bed temperature, optimal energy flow matching is achieved, and the energy utilization rate of the system is increased. Meanwhile, by adopting the reaction area and the sweeping area which are designed spirally, on one hand, the temperature uniformity of a reaction tube catalyst bed can be improved, and the sintering risk of a catalyst is reduced; on the other hand, by means of the rotational flow effect of the spiral structure, the hydrogen concentration polarization phenomenon can be effectively relieved, the hydrogen permeation amount is increased while hydrogen in-situ separation is achieved, and the pure hydrogen yield of the system is increased. The device has the characteristics of wide working condition application range, high methanol conversion rate, low hydrogen separation cost, compact structure and the like.

The invention provides a high-temperature rotational molding controlled-release cross-linked composition as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The high-temperature rotational molding controllable slow-release cross-linked composition disclosed by the invention is prepared from the following components in parts by weight: 100 parts of high-density polyethylene resin, 0.05 to 0.5 part of free radical slow-release initiator, 0.05 to 2 parts of allyl assistant cross-linking agent, 0.05 to 0.2 part of main antioxidant and 0.1 to 0.5 part of auxiliary antioxidant. Through a two-stage rotational molding process, crosslinking is slowly released and controllably initiated at a high temperature, so that the influence on a high-density polyethylene crystalline region is reduced while the ESCR performance is greatly improved, and relatively low hydrogen permeability is kept. The high-temperature rotational molding controllable slow-release cross-linked composition can be applied to a compressed hydrogen plastic inner container for a vehicle.

Disclosed is a metal part (100) comprising a surface (112) with low hydrogen permeability. Also disclosed is a method for structuring such a part (100) by femtosecond laser irradiation.

The invention discloses a hydrogen resistance and anti-oxidation method for the inner walls of a pressure container, a bottle, a pipeline and a valve, which comprises the following steps of: (1) performing sand blasting or internal grinding treatment on the surface of the inner wall of a high-pressure hydrogen storage container, and removing oxide skin; (2) vacuumizing the treated container to 0.1-1.0 MPa or replacing with N2, and introducing a mixed gas composed of 75-85% by volume of fluorine and 15-25% by volume of nitrogen; (3) rotating the container at a constant speed of 5-20 revolutions per minute for 30-120 minutes, so that the mixed gas is uniformly attached to the surface of the inner wall to form a fluoride protective film; and (4) standing for 24 hours, exhausting gas, and introducing the exhausted gas into a calcium hydroxide solution at 20-60 DEG C to react to generate marble. According to the 30CrMo steel treated through the method, after a 72-hour hydrogen permeation test, the corrosion rate is reduced to 0.01 mm / a or below, and the hydrogen permeability is reduced by 92%; the tensile strength retention rate of the substrate is greater than or equal to 95% and is superior to that of a high- The friction coefficient of the fluoride film is less than or equal to 0.1 and is obviously reduced compared with nickel-plated Marble generated from tail gas can be recycled, and fluorine-free gas is directly discharged.

The utility model relates to the technical field of hydrogen energy storage, and discloses a hydrogen storage bottle for hydrogen energy, which comprises a base, a bottle body and the like. The bottle body is of a multi-layer composite structure and comprises an inner container layer, a buffer layer and a shell layer, a first bottle mouth and a second bottle mouth are arranged at an upper-end bottle opening, a pressure sensor, a temperature sensor and a hydrogen leakage sensor are installed inside and at the joint respectively, and a fireproof heat insulation layer is sleeved on the outer side. The multi-layer structure has the advantages that in the multi-layer structure, the inner container prevents hydrogen permeation, the buffer layer absorbs energy, the shell provides high-strength protection, and the impact resistance and the safety performance are improved; the manual valve and the automatic valve are arranged, so that hydrogen storage safety is guaranteed; the pressure, temperature and leakage conditions in the bottle can be comprehensively monitored in real time, and abnormity disposal is facilitated; the bottle is protected when the fireproof heat insulation layer has an accident, and the safety of the hydrogen storage bottle in different environments is enhanced by a reliable protection structure.

The invention belongs to the technical field of hydrogen energy resources, and particularly relates to an oxide composite coating as well as a preparation method and application thereof. The oxide composite coating provided by the invention comprises a chromium layer, a chromium / chromium oxide composite layer, a chromium oxide layer, a chromium oxide / aluminum oxide composite layer, an aluminum oxide layer, an aluminum oxide / erbium oxide composite layer and an erbium oxide layer which are sequentially stacked, the mass percentage content of chromium in the chromium / chromium oxide composite layer is reduced in a gradient manner; the mass percentage content of chromium oxide in the chromium oxide / aluminum oxide composite layer is reduced in a gradient manner; the mass percentage content of aluminum oxide in the aluminum oxide / erbium oxide composite layer is reduced in a gradient manner. A composite transition layer with gradient composition change is introduced into the interface of the substrate / oxide layer and the interface of the oxide layer / oxide layer, so that the obvious interface is eliminated, and the interlayer bonding force is greatly improved. Chromium oxide, aluminum oxide and erbium oxide are all excellent hydrogen barrier materials, the multilayer structure and the interface thereof can effectively prolong the permeation path of hydrogen, and the hydrogen permeation barrier coefficient is improved.