1245 results about "Corrosive substance" patented technology

The invention relates to the technical field of wind power blade material testing, and discloses a testing device and method for a salt spray corrosion test of a wind power blade composite material layer. According to the method, wind power blade composite material coating preparation parameters are obtained, and coating basic information is provided for subsequent performance evaluation; based on preset salt spray test environment control parameters, dynamic salt spray environment simulation conditions are generated so as to better fit the actual outdoor environment; then, a multi-sensor coupling monitoring network is constructed, real-time data acquisition is conducted on the corrosion process of the composite material coating, and comprehensive tracking of the corrosion process is achieved; processing real-time data by utilizing a corrosion characteristic analysis algorithm, generating a multi-dimensional corrosion characteristic index, and quantitatively representing the corrosion condition of the coating; and finally, evaluating the anti-corrosion stability of the new material coating in combination with the coating characteristic parameters and the multi-dimensional corrosion characteristic indexes. According to the method, the corrosion resistance of the coating in the actual environment can be more accurately reflected, and support is provided for research, development and application of the composite coating of the wind power blade.

The invention belongs to the field of corrosion and protection, and discloses a preparation method of an intelligent coating with multistage self-repairing capability. According to the method, a core-shell structure nano container with a metal organic framework (MOF) compound as a core and layered double hydroxide (LDH) as a shell is prepared, different functional objects are respectively loaded in the core and the shell by adopting a step-by-step in-situ loading method, and graded release of the functional objects is realized by utilizing pH responsiveness of the MOF and corrosive ion responsiveness of the LDH; the nano container is added into an organic coating as a filler to construct an intelligent coating with multi-stage self-repairing capability. The problems of passive protection and uncontrollable corrosion inhibitor release of a traditional anti-corrosion coating are solved, the coating can repair corrosion defects in time according to needs, the long-acting corrosion resistance is remarkably improved, the preparation process is simple, the condition is mild, and the coating is suitable for metal protection of high-end equipment and other complex service environments.

The invention relates to the technical field of molten salt, in particular to nitro binary molten salt and a preparation method thereof. The preparation method comprises the following steps: mixing sodium carbonate and a potassium hydroxide solution, and then adding a starch-based grafted crystal inhibitor to inhibit crystallization; adding a nitric acid aqueous solution in two stages, and introducing eutectic seed crystals to guide nucleation at the end of the first stage; crystal distribution is optimized through falling film evaporation and concentration and setting of partial reflux; and after spraying granulation, carrying out short-time melting reforming and controlled cooling in an inert atmosphere. According to the method, the composition uniformity and the structural stability of the molten salt are remarkably improved, so that the product has a melting point close to a theoretical eutectic point, low supercooling degree, high melting latent heat and excellent thermal cycling stability and corrosion resistance, and is suitable for an industrial heat storage system running for a long time.

The invention discloses an electrolytic solution of a platinum-rhodium alloy, a preparation method and a preparation method of a plating layer of the platinum-rhodium alloy, and belongs to the technical field of precise electroplating. The electrolytic solution comprises a platinum salt, a rhodium salt, a first additive, a second additive, a first complexing agent, a second complexing agent, a first stabilizer and a second stabilizer, the first additive is a sulfamic acid compound containing 3-4 hydroxyalkyl groups, the second additive is sulfamic acid salt containing 3-4 hydroxyalkyl groups, and the first complexing agent and the second complexing agent are a platinum salt and a rhodium salt. The first complexing agent is a mixture of dicarboxylic acid and dicarboxylic acid containing amino or hydroxyl, the second complexing agent is a salt corresponding to the dicarboxylic acid, and the first stabilizer is a mixture of alkyl sulfonic acid and alkyl sulfonate. Through the synergistic effect of the additive, the complexing agent and the stabilizer, the additive, the complexing agent and the stabilizer form a five-membered to seven-membered heterocyclic coupling structure with platinum ions and rhodium ions, and the stability of the electrolytic solution is remarkably improved. And the obtained platinum-rhodium alloy coating is compact and uniform, and has excellent nitric acid steam and mixed gas corrosion resistance.

The invention discloses an immersed heat dissipation composite phase change cooling liquid, which is prepared from the following components in parts by weight: 97.0 to 99.7 parts of basic liquid, 0.1 to 1.5 parts of antioxidant and heat stabilizer, 0.1 to 0.8 part of corrosion inhibitor and 0.1 to 0.5 part of state monitoring tracer agent, the invention has the advantages of high-efficiency phase change heat dissipation capability, excellent electrical insulating property, long-term chemical stability, corrosion resistance and leakage monitoring property.

The invention relates to the technical field of cables, and provides a high-toughness corrosion-resistant medium-voltage power cable, which comprises a conductor, and an insulating layer, a shielding layer, an armor layer and a sheath layer which are sequentially arranged outside the conductor, the sheath layer comprises the following components in parts by weight: 70-100 parts of polyvinyl chloride, 30-40 parts of nitrile rubber, 10-15 parts of a flame retardant, 15-20 parts of a plasticizer, 1-3 parts of an antioxidant, 5-10 parts of a filler, 2-4 parts of a heat stabilizer, 1-3 parts of a compatilizer and 0.5-2 parts of a cross-linking agent; the filler is prepared from the following raw materials in parts by weight: 100 parts of calcium carbonate, 20 to 24 parts of 2-ethylhexyl acrylate and 6 to 10 parts of acrylic acid. According to the technical scheme, the problem of poor corrosion resistance of the medium-voltage power cable in the prior art is solved.

This invention belongs to the field of catalytic material preparation technology, specifically relating to a method for preparing high specific surface area pure phase α-type molybdenum carbide by hydrogen intercalation modification of MoO3 and its application, including the following steps: (1) adding MoO3 powder to hydrochloric acid and dispersing it to prepare a mixture of MoO3 and hydrochloric acid; (2) adding metal powder to the mixture in step (1) and performing pre-reduction treatment by in-situ hydrogenation of the metal and hydrochloric acid to prepare H x MoO3 precursor; (3) H prepared in step (2) x The MoO3 precursor is carbonized under a carbon source gas to obtain a pure α-type molybdenum carbide with a high specific surface area. This method is simple and effective, avoids the use of corrosive NH3 gas during carbonization, and does not require a metal as a medium, thus solving the current problem of not being able to prepare metal-free modified pure α-MoC in one step.

The invention relates to the technical field of cables, and provides a corrosion-resistant control cable and a preparation method thereof. The corrosion-resistant control cable sequentially comprises a conductor, an insulating layer, a shielding layer and a sheath layer from inside to outside, wherein the sheath layer comprises the following components in parts by weight: 50-70 parts of polyvinyl chloride, 15-25 parts of ethylene propylene diene monomer, 10-20 parts of modified graphene oxide, 0.5-1.5 parts of an antioxidant, 3-5 parts of a plasticizer, 15-20 parts of a flame retardant, 2-4 parts of a compatilizer, 4-5 parts of an active agent, 1-3 parts of an assistant crosslinking agent and 1-3 parts of a crosslinking agent; wherein the modified graphene oxide is obtained by modifying graphene oxide with dimethyl 5-hydroxyisophthalate and N-hydroxymethyl acrylamide. According to the technical scheme, the problem of insufficient corrosion resistance of the control cable in the prior art is solved.

The invention discloses oxidation corrosion resistant die steel which comprises the following components in percentage by weight: 0.36-0.47% of C, 0.81-0.89% of Si, 0.83-1.21% of Mn, 19.41-22.51% of Cr, 4.75-5.25% of Al, 0.50-0.75% of Ni, Mo, W, Cu, Mg, Zn, Ca, B, rare earth elements La and Ce, and the balance of Fe and impurities, and Zn / (Mg + La + Ce) is more than or equal to 0.75 and less than or equal to 2.50, and B / (Zn + Ca) is more than or equal to 0.09 and less than or equal to 0.31. The die steel has excellent oxidation corrosion resistance and good comprehensive mechanical properties and surface properties, and is suitable for manufacturing large-size dies or parts.

The invention relates to a high-solid-content epoxy glass flake heavy anti-corrosion coating for an offshore wind power foundation, which consists of a component A and a component B, the component A is prepared from raw materials in percentage by weight as follows: 10%-20% of bisphenol A epoxy resin, 20%-40% of modified hydrogenated epoxy resin, 5%-10% of liquid petroleum resin, 1%-2% of a rheological aid, 0.1%-1% of a dispersant, 0.1%-1% of a defoaming agent, 1%-3% of a silane coupling agent, 5%-10% of modified glass flakes, 20%-40% of functional filler and 0-10% of a composite environment-friendly solvent; and the component B is a mixed amine epoxy curing agent. The epoxy glass flake coating disclosed by the invention can be thickly coated at one time, has excellent adhesive force, hardness, wear resistance and impact resistance, is high in drying speed, excellent in chemical corrosion resistance, seawater soaking resistance and cathodic disbonding resistance, and meets the performance requirements of NORSOK M-501: 2022 (edition VII) Surface Treatment and Protective Coating.

The application discloses a nodular cast iron pipe with a composite coating and belongs to the technical field of metal corrosion prevention, comprising a nodular cast iron pipe base body, a composite outer coating coated on the outer surface of the nodular cast iron pipe base body and an inner coating closely attached to the inner surface of the nodular cast iron pipe base body, characterized in that the composite outer coating comprises an alkali-activated gel layer and a zinc-based coating, the zinc-based coating is arranged between the outer surface of the nodular cast iron pipe base body and the alkali-activated gel layer, the alkali-activated gel layer is an alkali-activated slag fly ash corrosion-resistant gel material, and the zinc-based coating is one or more of a pure zinc coating, a zinc-aluminum alloy coating or a zinc-rich coating layer. The alkali-activated gel layer provided by the application is coated on the inner or outer surface of the pipe and provides further corrosion protection for the nodular cast iron pipe, so that the pipe can be used in extremely harsh construction environments, and has extremely strong weather resistance in acidic soil and overhead fields.

The invention discloses a preparation method of a high-strength corrosion-resistant PVDF-based composite material, and belongs to the technical field of composite materials. The method mainly comprises the following steps: (1) preparing surface nanocrystallization carbon fibers with SiO2 nano layers on the surfaces through alkali liquor activation, silanization and in-situ growth processes; (2) preparing fluorine-containing modified graphene oxide; (3) mixing the filler with PVDF resin, introducing a VDF monomer for in-situ polymerization, and constructing a chemical bonding interface; (4) respectively preparing outer layer slurry rich in nano TiO2, middle layer slurry rich in surface nanocrystallization carbon fibers and inner layer slurry rich in SiO2 coated Al2O3 core-shell nanoparticles by quantitatively supplementing specific filler; and (5) carrying out gradient tape casting, segmented drying, hot press molding and annealing treatment to prepare the composite material. The problems that a traditional PVDF material is weak in interface bonding and corrosion resistance and strength are difficult to consider at the same time are solved, and the prepared material has excellent mechanical strength and strong acid corrosion resistance.

The invention provides a treatment method for synergistically enhancing the comprehensive performance of a neodymium-iron-boron magnet, and belongs to the technical field of magnetic materials. According to the method, a heavy rare earth layer and a corrosion-resistant metal layer such as copper, nickel and cobalt for promoting grain boundary diffusion of heavy rare earth are respectively deposited on the surface of the neodymium-iron-boron magnet by adopting a multi-layer electroplating method, the coercivity of the neodymium-iron-boron magnet is enhanced through grain boundary diffusion, and the corrosion resistance of the magnet is enhanced through a nickel-cobalt coating. The treatment method comprises the following steps: carrying out electrochemical deposition on the neodymium-iron-boron magnet in a heavy rare earth metal plating solution, and then respectively electroplating a copper plating layer and a nickel-cobalt plating layer to obtain a heavy rare earth-containing plating layer with strong corrosion resistance and good plating film binding force; the neodymium-iron-boron magnet containing the heavy rare earth coating is subjected to heat treatment, and the coercive force of the magnet is improved through heavy rare earth grain boundary diffusion. The neodymium iron boron grain boundary diffusion process and the surface corrosion prevention process are subjected to integrated treatment, the technological process of high-performance neodymium iron boron industrial preparation is shortened, and the coercive force and the corrosion resistance of the magnet are comprehensively enhanced.

The invention provides a high-strength corrosion-resistant CPVC plate and a preparation method thereof, and belongs to the technical field of high polymer materials, the preparation method comprises the following steps: S1, preparing Si-MBS; s2, mixing CPVC resin powder, Si-MBS, chlorinated polyethylene, a stabilizer, a processing aid, a lubricant and a coupling agent-hollow microsphere, melting, plasticizing, extruding, calendaring to form a plate, and cooling and shaping to obtain a CPVC base material; and S3, spraying the coating slurry containing ZIF-67 / GO-coated BTA / PEI powder on the surface of the CPVC base material, vacuumizing, and curing to obtain the high-strength corrosion-resistant CPVC plate. The overall strength and impact resistance can be improved, and meanwhile the overall corrosion resistance is improved.

The invention discloses an environment-friendly anti-icing and deicing coating as well as a preparation method and application thereof, and aims to solve the problems of low efficiency, high corrosivity, serious environmental pollution and the like in the traditional anti-icing and deicing technology. The coating material is prepared from the following components: deionized water, polyvinylpyrrolidone, propylene glycol, glycerol, fumed silica, granular silica, ethanol, potassium acetate and a waterborne polyurethane coating. The invention further provides a preparation method of the coating material, and the coating material is applied to anti-icing of metal and plastic substrates and has dual functions of preventing icing and rapidly removing ice. The coating has the advantages of being good in durability, environmentally friendly, free of corrosion to base materials and the like, is particularly suitable for anti-icing protection of equipment such as rails, wind power blades and cables, remarkably improves the operation and maintenance efficiency of key facilities and equipment, reduces the maintenance cost and has important economic and social benefits.

The application provides a low yield ratio heavy industrial atmospheric corrosion resistant bridge steel plate and a manufacturing method thereof. The steel plate comprises the following components in percentage by weight: C: 0.07% to 0.10%, Si: 0.10% to 0.30%, Mn: 0.60% to 1.00%, P: less than or equal to 0.010%, S: less than or equal to 0.003%, Nb: 0.02% to 0.04%, Ni: 0.15% to 0.35%, Cu: 0.10% to 0.40%, Mo: 0.20% to 0.50%, Cr: 1.50% to 2.40%, Ti: 0.01% to 0.030%, Sb: 0.03 to 0.10%, Al: 0.015% to 0.040%, and the balance of iron and inevitable impurities. The production method of the steel plate comprises the following steps: molten iron pretreatment, smelting, continuous casting, slab heating, rolling and straightening. The steel plate has the following properties: yield strength is greater than or equal to 345 MPa, tensile strength is greater than or equal to 510 MPa, elongation after fracture is greater than or equal to 30%, yield ratio is less than or equal to 0.75, thickness direction section shrinkage is greater than or equal to 70%, and low temperature impact energy at-40 DEG C is greater than or equal to 300 J. The annual corrosion rate of the steel plate in a simulated heavy industrial atmospheric environment is less than or equal to 0.05 mm / a, and the corrosion performance is 4 to 8 times higher than that of common Q345qE.

A coated steel sheet providing cathodic protection and suitable for manufacturing a press hardened part with good powdering resistance during press-hardening and good corrosion performance. A method for the manufacture of hardened parts starting from a steel sheet coated with a metallic coating. The part has good characteristics with respect to corrosion and powdering resistance. The present disclosure is particularly well suited for the manufacture of automotive vehicles.

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 invention provides a high-strength corrosion-resistant steel strand and a preparation process thereof, and belongs to the technical field of steel strand manufacturing. The steel strand raw material wire rod comprises the following chemical components in percentage by weight: 0.95%-1.08% of C, 1.00%-2.20% of Si, 0.60%-1.45% of Mn, 0.28%-0.38% of Cr, 0.05%-0.09% of V, 0.20%-0.27% of Ni, 0.24%-0.30% of Cu and 0.020%-0.030% of Alt, and (Si + 1.2 * Mn) / (8 * V) is more than or equal to 4.0 and less than or equal to 6.2. The preparation process comprises the key steps of converter smelting, LF furnace refining, RH vacuum degassing composite refining, diffusion annealing, two-section type controlled cooling, multi-pass drawing, intermediate destressing treatment and the like. The tensile strength of a finished product is larger than or equal to 2400 MPa, the corrosion rate of a 5% NaCl solution for 96 h is reduced by 75% or above compared with a traditional 82B wire rod, and the drawing wire breakage rate is smaller than or equal to 0.1%.

The invention relates to the field of automobile oil-water transmission systems, in particular to an anti-aging and anti-oxidation oil-water transmission pipe for an automobile and a preparation method of the anti-aging and anti-oxidation oil-water transmission pipe, and aims to solve the problems that an existing oil-water transmission pipe is poor in anti-aging and anti-oxidation performance and anti-corrosion performance, so that the oil-water transmission pipe is often aged, oxidized and corroded; and the performance of the oil-water transmission pipe is reduced. According to the oil-water transmission pipe, the multi-hindered phenol compound and the multi-fluorine compound are used as additives, so that the aging oxidation resistance and the oil corrosion resistance of the oil-water transmission pipe are remarkably enhanced, the aging and corrosion of materials can be effectively prevented, and the service life of the oil-water transmission pipe is greatly prolonged; the maintenance cost and the replacement frequency caused by aging and corrosion of the oil-water transmission pipe are reduced, so that the long-term stable operation of the oil-water transmission system is ensured.

The invention relates to the field of regenerated magnetic materials, in particular to a process for recycling a regenerated neodymium iron boron magnet from waste neodymium iron boron. The invention discloses a process for recycling and regenerating a neodymium iron boron magnet from waste neodymium iron boron. The process comprises the following steps: preparing Tb-HoBiO3 powder; pretreating the waste neodymium iron boron; pretreating the waste neodymium iron boron to prepare a blank body; and carrying out low-temperature supergravity sintering impurity removal and tempering treatment on the blank. According to the method, the Tb-HoBiO3 powder is prepared, and the Tb-HoBiO3 powder can better promote the uniform transformation of a blocky grain boundary phase into a strip shape and wrap the periphery of a grain main phase in the blank sintering process, so that local stray fields in the main phase grains and the magnet can be isolated, the demagnetization resistance of the regenerated neodymium-iron-boron magnet is remarkably improved, and the service life of the regenerated neodymium-iron-boron magnet is prolonged. Therefore, the magnetic performance of the regenerated neodymium-iron-boron magnet is improved, main phase crystal grains can be effectively prevented from falling off, the density of the regenerated neodymium-iron-boron magnet is improved, microdefects are reduced, the corrosion resistance of the regenerated neodymium-iron-boron magnet is remarkably improved, and the service life of the regenerated neodymium-iron-boron magnet can be prolonged.

The invention relates to special-corrosion-resistant martensitic heat-resistant steel and a preparation method thereof, belongs to the technical field of nuclear heat-resistant steel, and solves the problems of poor oxidation corrosion resistance, low strength and poor impact toughness and plasticity of ferrite / martensitic steel in high-temperature liquid lead bismuth in the prior art. The heat-resistant steel comprises the following chemical components in percentage by mass: 0.10-0.13% of C; 0.9 to 1.4 percent of Si; mn: 0.5 to 0.7%; 8.5 to 9.0 percent of Cr; 0.4 to 0.6 percent of W; 0.7 to 0.8 percent of Mo; 0.25 to 0.40 percent of Ni; 0.15% to 0.20% of V; 0.05 to 0.07 percent of Nb; the content of N is 0.045 to 0.065 percent; compared with the prior art, the heat-resistant steel disclosed by the invention has the advantages that a compact Si-rich oxide layer is ensured to exist in the heat-resistant steel by increasing the content of Si, so that the high-temperature liquid lead / lead bismuth corrosion resistance of the material is improved; by adjusting the content of Mn, Cr, Ni, W, Mo and other elements, it is ensured that the material has a single martensite structure, the heat-resistant steel has good room-temperature and high-temperature mechanical properties at the same time, and the heat-resistant steel is suitable for lead-cooled fast reactor structural materials.

The application belongs to the technical field of methane coupling photocatalysts, and particularly discloses a preparation method and application of a catalyst modified by MgO and Au / TiO2(Br). The Au / MgO / TiO2(Br) catalyst prepared by the method is used for methane coupling catalysis, the catalytic reaction conditions are optimized, high catalytic efficiency is ensured, the selectivity of the target product C 2+ is up to 90% at a reaction temperature of 120 DEG C, and the yield is as high as 38.7 mmol / g / h. In addition, the process for preparing the Au / MgO / TiO2(Br) catalyst is simple, the preparation conditions of the catalyst are optimized, and no corrosive substance needs to be added in the catalyst reaction process, and no acid-base substance and toxic substance by-product are generated in the whole process, the harm of the reaction to the reaction operator is small, the environmental pollution is negligible.

The application discloses a method for monitoring and controlling corrosion environment of an underwater concrete structure in a brackish water area, and the method comprises the following steps: laying a monitoring system, monitoring the concentration of chloride ions, analyzing data of the distribution of the concentration of chloride ions, dividing the area according to the concentration of chloride ions, adjusting an impressed current, and giving a warning of the corrosion environment; the brackish water area is divided into a constant saltwater area, a constant freshwater area and a brackish water interface change area by continuously collecting data of the concentration of chloride ions and constructing a concentration field and a gradient field model, so that the risk degree of the corrosion environment can be directly reflected, and the cathodic protection parameters can be dynamically adjusted according to the real-time corrected chloride ion concentration field model, thereby realizing the intelligent monitoring, early warning and control of the corrosion environment of the underwater concrete structure in the brackish water area.

The invention relates to the technical field of coatings, and discloses an acid and alkali resistant UV curing coating and a preparation method thereof. The prepared UV curing coating is prepared from the following raw materials in parts by weight: 40 to 60 parts of acrylic resin, 3 to 8 parts of pentaerythritol tetraacrylate, 3 to 7 parts of silicon dioxide, 3 to 5 parts of a photoinitiator, 6 to 12 parts of a composite reinforcing agent, 0.2 to 0.6 part of a flatting agent, 1 to 2 parts of a dispersing agent, 0.5 to 1.5 parts of a de-foaming agent and 15 to 25 parts of water. A coating film obtained after the coating is subjected to ultraviolet curing has excellent acid and alkali resistance, salt spray resistance and adhesive force and can be widely applied to the surface of a metal base material, and the metal base material is protected against corrosion of corrosive media such as acid, alkali and salt.

The utility model discloses a kind of side slope anchor cable anchor cap, including the anchor cap component assembled on anchor cable assembly, anchor cap component includes anchor cap and anchor backing plate, more than two fixed screw holes are opened on anchor backing plate, anchor backing plate and anchor cap are fixed together by screw;Anchor cap is combined by cap body, oiling pipe and annular fixed wing plate, cap body and annular fixed wing plate are integrally formed, cap body is cylindrical cavity structure, oiling pipe is arranged on cap body one side top, oiling pipe is communicated with cap body interior, annular fixed wing plate is provided with multiple fixed holes corresponding with fixed screw hole. Anchor cap and anchor backing plate are closely connected by screw, and sealing rubber ring is set, greatly improve the connection stability and sealing property, can realize storage anticorrosive oil function, effectively prevent outside moisture and corrosive substance invasion, prolong the service life of working anchor, anchor cable clamping piece, improve the durability of anchoring structure.

The utility model discloses a special flow meter device for acid industry chromatography, which comprises a connecting pipeline, and flange connecting ends are mounted at two ends of the connecting pipeline; a sealing assembly is arranged in the flange connecting end and comprises a sealing sleeve, one end of the sealing sleeve is inserted into the flange connecting end, and the other end of the sealing sleeve is inserted into an external pipeline; the sealing pieces are arranged in the middle and at the two ends of the sealing sleeve, the sealing pieces abut against the flange connecting end and an external pipeline respectively, an annular groove is formed in an opening of the flange connecting end, and a connecting protrusion is formed on the outer surface of the middle of the sealing sleeve; by means of the designed sealing assembly, continuous and multi-layer sealing barriers are formed in the flange connecting end, the barriers can effectively resist corrosion of corrosive media and can keep excellent sealing performance under the extreme working conditions of high pressure, high temperature and the like, and therefore long-term stable operation of the flowmeter is guaranteed, and the service life of the flowmeter is prolonged. Meanwhile, practicability and convenience of an industrial site are fully considered in design of the sealing assembly.

The application provides a low-oxygen PMZ4020Nb ferritic stainless steel water atomization powder and a preparation method thereof, and belongs to the technical field of powder metallurgy. According to the weight percentage, the chemical components of the powder include C≤0.02%, Cr 16.5-17.5%, Mo 0.9-1.1%, Nb 0.4-0.6%, Si 0.7-2.2%, Mn≤0.3%, P≤0.03%, S≤0.02%, and the balance of Fe and inevitable impurities. The oxygen content of the powder is ≤1200ppm, wherein the free oxygen content is ≤300ppm, and the combined oxygen content is ≤900ppm. The particle size distribution of the powder is that the proportion of particles with a size of-200 mesh is ≥90%, and the proportion of particles with a size of-300 mesh is ≥65%. The loose bulk density of the powder is 2.9-3.1g / cm3, and the flowability is ≥25s / 50g. The micro-morphology of the powder is spherical, and the sphericity is ≥0.85. The low-oxygen PMZ4020Nb ferritic stainless steel water atomization powder and the preparation method thereof have excellent corrosion resistance, low oxygen content, excellent comprehensive powder performance, process stability and scalability.

The present application belongs to the technical field of cleaning products, and particularly relates to a high-temperature oil stain removing stove cleaner as well as a preparation method and application thereof. The high-temperature oil stain removing stove cleaner provided by the present application comprises the following components and mass fractions: 11-33 parts of an alkaline additive, 1-2 parts of hydroxyethylidene diphosphonic acid, 3-6 parts of a non-ionic surfactant, 4-8 parts of a solvent, 1-3 parts of a solubilizer, 1-3 parts of sodium xylene sulfonate, and 45-79 parts of water; the solvent comprises ethylene glycol monobutyl ether and diethylene glycol ethyl ether. The high-temperature oil stain removing stove cleaner provided by the present application has the advantages of simple cleaning method, high-temperature oil removing effect, good stain removing and oil scale removing effect on commercial kitchen utensils, high safety, no corrosion to metal, simple raw material composition, and no need to add a defoaming agent.

The present application relates to the field of high-speed spraying technology, in particular to a supersonic flame spraying process for steam turbine blades. The present application overcomes the problems of insufficient coating bonding strength and poor corrosion resistance of the supersonic flame spraying. The present application uses nickel-coated alumina composite sand for sandblasting pretreatment of the blades to achieve micro-implantation of active nickel; adjusts the ratio of NiCr and Cr3C2-NiCr powders by using double powder feeders to build a gradient structure coating with continuous component change; uses a modified sealing agent containing nano-alumina for vacuum impregnation sealing; and finally obtains finished blades through graded vacuum diffusion annealing. Through surface nickel implantation, gradient structure design and diffusion annealing, the present application realizes metallurgical bonding and thermal stress matching between the coating and the substrate, greatly improving the bonding strength; at the same time, the in-situ ceramicization reaction of the sealing agent eliminates micro-pores, significantly enhancing the corrosion resistance of the coating.