95 results about "Ammonium bifluoride" patented technology

The invention belongs to the technical field of oil and gas development, and particularly relates to an oil and gas well blocking remover and a preparation method thereof. The blocking remover comprises the following components: 5-8% of low-carbon composite organic acid, 5-7% of fluoboric acid, 6-9% of ammonium bifluoride, 4-6% of an anti-acid sludge mutual solvent, 2-4% of a corrosion inhibitor, 2-4% of polyoxypropylene polyoxyethylene propylene glycol ether, 8-12% of a permeation dispersion surfactant, 2-5% of a sulfur dissolving agent, 2-5% of a stable chlorine dioxide solution and the balance of water. The preparation method comprises the following steps: adding the low-carbon composite organic acid, the fluoboric acid and the ammonium bifluoride into water and stirring; adding an acid sludge resisting mutual solvent and a sulfur dissolving agent, and stirring; adding the corrosion inhibitor, the polyoxypropylene polyoxyethylene propylene glycol ether and the permeation dispersion surfactant, and stirring; and finally, reducing the stirring speed, adding the stable chlorine dioxide solution, and stirring to uniformly mix. The blocking remover provided by the invention is comprehensive in blocking removal function, very good in dissolving and dispersing performance on complex blocking substances, very small in corrosion damage to a shaft pipe wall and wide in applicability.

The invention discloses an efficient thermal cycle drying device for producing flaky ammonium bifluoride, and relates to the technical field of ammonium bifluoride production. Comprising a machine body, an exhaust pipe and an air inlet sleeve, a first shell and a second shell are sequentially mounted at the upper end of the machine body from left to right, an air inlet cavity is formed in the bottom of the inner side of the machine body, and a mounting cylinder is connected to the upper end of the air inlet cavity through a spring; through cooperation of a mounting cylinder, a movable cylinder, a scraping plate and a first adjusting assembly, when materials are subjected to traditional one-way vibration blowing heat exchange, the materials are thrown and turned in the other direction to increase the drying uniformity, meanwhile, the air flow pressure of an exhaust hole is correspondingly adjusted, and the heat exchange drying effect is improved; and through cooperation of the movable barrel and the second adjusting assembly, when materials with the large water content and the large feeding amount are dried, the moving speed of the materials is increased, meanwhile, the air flow pressure of the exhaust holes is correspondingly adjusted, and the heat exchange drying effect is improved.

The invention discloses a graphene quantum dot material as well as a preparation method and application thereof, and belongs to the technical field of biomedical materials. The preparation method comprises the following steps: S1, carrying out hydrothermal reaction on a mixed solution of mesoporous SiO2 and a carbon source to obtain a product I; s2, the product I and a fluoride solution are mixed to remove SiO2, and a product II is obtained; and S3, refining the product II to obtain the graphene quantum dot material. The carbon source is selected from at least one of triammonium citrate, diammonium hydrogen citrate, citric acid, folic acid, urea, thiourea and dicyanodiamine; the fluoride is selected from ammonium bifluoride and / or hydrogen fluoride. The particle size of the graphene quantum dot material provided by the invention is 15-30nm, the distribution is controllable, and the raw materials are easy to obtain; the prepared platinum nanoparticle / graphene quantum dot composite nanomaterial is high in solubility, stable in physical and chemical properties and remarkable in chemotherapy effect.

The invention relates to the technical field of surface strengthening treatment and coating preparation, in particular to a micro-arc oxidation electrolyte, a preparation method of the micro-arc oxidation electrolyte and a preparation method of an oxide ceramic coating on the surface of a magnesium-copper dissimilar metal material component. The invention provides a micro-arc oxidation electrolyte. The micro-arc oxidation electrolyte comprises a main film-forming agent, an arcing aid, a pH regulator, a corrosion inhibitor and water, the main film-forming agent comprises ammonium fluozirconate and / or potassium fluozirconate; the arcing aid comprises one or more of disodium hydrogen phosphate, sodium dihydrogen phosphate, ammonium dihydrogen phosphate and diammonium hydrogen phosphate; the corrosion inhibitor comprises one or more of hexamethylenetetramine, ammonium bifluoride and triethanolamine. The micro-arc oxidation electrolyte breaks through the problem that valve metal and non-valve metal cannot be subjected to arc discharge at the same time for micro-arc oxidation treatment in the micro-arc oxidation process.

The invention provides a method for preparing high-purity flaky alumina based on a hydrolysis method, and belongs to the field of high-purity flaky alumina powder. The method comprises the steps that metal aluminum scraps are pretreated; the method comprises the following steps: putting metal aluminum scraps, an alkaline organic matter catalyst and a morphology control agent into water, and carrying out a hydrolysis reaction at a set temperature for a set time to obtain a reaction mixed solution; carrying out solid-liquid separation, washing and drying on the reaction mixed solution to obtain flaky aluminum hydroxide; and roasting the flaky aluminum hydroxide to remove crystal water so as to obtain high-purity flaky aluminum oxide, wherein the alkaline organic matter catalyst comprises at least one of the following components: tetraethylammonium hydroxide, tetramethylammonium hydroxide, tetrapropylammonium hydroxide and tetrabutylammonium hydroxide; the morphology control agent comprises at least one of ammonium bifluoride and ammonium fluoride. The preparation method disclosed by the invention is simple in process flow, free of an impurity removal process, mild in reaction condition, short in reaction time and free of environmental pollution, and the product is regular in shape and high in purity.

The invention provides a nitrogen-fluorine double-element doped porous carbon material, a silicon-carbon negative electrode material and a preparation method thereof, and the preparation method of the porous carbon material comprises the following steps: mixing porous carbon with ammonium fluoride and / or ammonium bifluoride, and carrying out vapor deposition coating or liquid phase coating; and calcining the coated porous carbon material in a closed environment in an inert atmosphere to obtain the nitrogen-fluorine double-element doped porous carbon material. According to the invention, by utilizing the characteristics of nano-scale micropores and super-large specific surface of porous carbon and the properties of low melting point and low boiling point of ammonium fluoride and ammonium bifluoride, a uniformly coated ammonium fluoride and ammonium bifluoride coating layer is obtained by adopting a vapor deposition or liquid phase coating method, and then the porous carbon material is obtained by utilizing high-temperature calcination treatment. According to the present invention, the characteristics of high specific surface and nano-scale micropores can be simultaneously retained, and after the silicon-carbon negative electrode material is prepared, the expansion of the silicon-carbon negative electrode material is substantially reduced, the cycle performance of the material is ensured, and the rate capability of the obtained silicon-carbon negative electrode material is improved.

The utility model relates to the technical field of anhydrous ammonium hydrogen fluoride preparation, and discloses a micro-channel reaction device for preparing anhydrous ammonium hydrogen fluoride, which comprises a raw material tank, a vaporizer, a micro-channel reactor and a shell-and-tube heat exchanger, two driving motors are mounted at the upper end of the micro-channel reactor, stirring rods are mounted at the lower ends of the driving motors through motor shafts, a plurality of stirring blades are arranged on the stirring rods, a micro-channel groove is formed in the middle in the micro-channel reactor, a plurality of channels are uniformly distributed in the micro-channel groove, and two catalysts are mounted at the bottom end in the micro-channel reactor. Two driving motors are started, the driving motors drive stirring rods to rotate through motor shafts, the flow speed of ammonium bifluoride gas is increased, multiple channels are formed in the micro-channel groove, the contact area and the retention time of reaction gas can be increased through the channels, the reaction efficiency is improved, the reaction gas reacts with other reactants under the action of a catalyst, and the reaction efficiency is improved. Anhydrous ammonium bifluoride and other byproducts are generated, so that the reaction is sufficient.

The invention discloses an electrolyte containing ammonium hydrogen fluoride, which takes pure water as a solvent, and each liter of the electrolyte contains 6.1 to 10.3 g of ammonium hydrogen fluoride, 2.2 to 4.2 g of ammonium fluoride, 2.9 to 4.9 g of sodium fluoride and 0.22 to 0.42 g of 2, 5, 8, 11-tetramethyl-6-dodecyne-5, 8-diol; the method is used for treating the beryllium copper surface and comprises the following steps: (1) putting the electrolyte containing ammonium hydrogen fluoride into an electrolytic bath of electrolysis equipment; (2) putting a beryllium copper piece to be treated into the electrolyte in the step (1) as an anode, taking a stainless steel plate as a cathode, and electrolyzing under the action of direct current; (3) the beryllium copper piece subjected to electrolysis treatment is washed with pure water, and then the beryllium copper piece is placed in electroplating liquid for nickel plating; and (4) the beryllium copper piece subjected to nickel plating treatment is washed with pure water and dried to remove surface moisture, and the beryllium copper piece subjected to surface treatment is obtained. The method is safe and reliable to operate, clean and environment-friendly.

The present application relates to a method for reducing the content of sulfur in aluminum fluoride, which comprises the following steps: uniformly mixing crude aluminum fluoride powder containing sulfate impurities with ammonium hydrogen fluoride powder to obtain a mixture; placing the mixture in a reactor and performing programmed temperature calcination under a protective atmosphere; discharging the sulfur and fluorine-containing volatile gas generated by calcination after treatment by an absorption system; cooling the calcined material to room temperature; washing the cooled material with water or blowing inert gas to remove residual ammonium salt or dust, and then drying to obtain a low-sulfur aluminum fluoride product. The in-situ HF generated by the decomposition of NH4HF2 is used for gas-solid reaction, which can effectively attack and convert stable sulfate impurities existing in various forms, has high desulfurization efficiency and is deep and thorough; the reaction conditions are mild, the main phase of the product is stable, the process flow is simple, and the energy consumption is low.

The invention belongs to the technical field of wafer processing, and particularly relates to an organic etching solution for etching a groove of a quartz wafer and application of the organic etching solution. The organic etching liquid comprises 10%-20% of hydrogen fluoride, 20%-30% of ammonium bifluoride, 40% of pure water, 10%-12% of trisodium phosphate, 4%-8% of sodium chromate and 2% of polyethylene glycol. According to the organic etching solution prepared by the invention, the stability of the tuning fork quartz frequency chip is improved, the electrical property of the tuning fork quartz frequency chip is improved, the corrosion shape of the groove can be controlled by changing the corrosion rate of different crystal faces, and the effect of improving the performance is achieved.

The invention provides a process for purifying nickel from electrolytic waste for preparing nitrogen trifluoride, which comprises the following steps: after a nitrogen trifluoride electrolytic cell stops electrolysis, transferring the electrolytic waste into a first batching kettle, adding anhydrous hydrogen fluoride, dissolving ammonium bifluoride mixed in the electrolytic waste into a molten state, and adding a second batching kettle; then solid-liquid separation is achieved in a centrifugal mode, and the liquid part is molten liquid to be reused as electrolyte; ammonia water is added into a second batching kettle to adjust the pH value, solid-liquid separation is achieved in a centrifugal mode, the liquid part is transferred into an intermediate tank, potassium hydroxide is added to continue to adjust the pH value, nickel in the solution is precipitated out, ammonia escapes and is prepared into dilute ammonia water in a falling film absorption mode, and the dilute ammonia water can return to a system to be reused; the solid part directly enters a smelting furnace, the temperature is gradually increased until nickel is smelted into a liquid state, then cooling is conducted, and the nickel purity can reach 99% or above. According to the method, the nickel in the electrolytic waste mixed with the sediments in the nitrogen trifluoride electrolytic cell is purified, and appreciation is achieved.

The invention discloses marble rust removal gel, and relates to the technical field of marble surface processing treatment. The rust removal gel for marble comprises the following components in percentage by weight: 5-20% of ammonium bifluoride; 3-20% of organic acid; and 0.2 to 1% of xanthan gum. The marble rust removal gel provided by the invention is gel-like liquid, can be well attached to the surface of marble, and has the advantages of good rust removal effect and no corrosion to the surface of the marble.

The application discloses a method and system for preparing ammonium bifluoride from hydrofluoric acid waste liquid, which comprises the following steps: (1) adding the hydrofluoric acid waste liquid into an electrolytic cell, transporting the electrolytic cell to a first reaction kettle after electrodepositing treatment, adding silicon dioxide, then stirring and reacting, and returning the generated silicon tetrafluoride and hydrofluoric acid into a spray tower to react and then return to the first reaction kettle, and then adding ammonia water to perform neutralization reaction; (2) filtering the solid-liquid mixture I, evaporating and drying the obtained filtrate I to obtain an ammonium nitrate product, and returning the obtained filter cake I to a second reaction kettle, adding ammonia water to adjust the pH value, and then stirring and reacting; (3) filtering the solid-liquid mixture II, returning the obtained filter cake II to the first reaction kettle for reuse, transporting the obtained filtrate II to a reactor, adding hydrofluoric acid to perform reaction, and then performing evaporation and drying treatment to obtain an ammonium bifluoride product. The method is simple in process, low in energy consumption, convenient to operate and convenient for industrialized production and application.

The invention relates to the field of material surface treatment, in particular to a chemical polishing solution and a polishing method. The chemical polishing solution is suitable for the ferro-nickel alloy with the nickel content of 20-60% and the doped element content of less than 1%, and comprises an accelerant, a first acidic agent, a second acidic agent, a corrosion inhibitor, a brightener and a solvent. The first acidic agent comprises at least one of sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid and hydrofluoric acid, and the content is greater than or equal to 5%. The second acidic agent comprises at least one of ammonium bifluoride, ammonium fluoride, formic acid, benzoic acid, acetic acid, propionic acid, butyric acid, lactic acid, oxalic acid, malonic acid, tartaric acid, malic acid and citric acid, and the content of the second acidic agent is 1%-50%. The total content of the first acidic agent and the second acidic agent is 6-60%. The accelerant is used for oxidizing metal nickel and metal iron, and the content of the accelerant is 0.01%-5%. And the content of the corrosion inhibitor is 0.1-5%. By combining the accelerant, the first acid agent, the second acid agent and the corrosion inhibitor, the dissolving speed of the nickel phase and the iron phase is balanced, the surface flatness is improved through the brightening agent, and the polishing effect is improved.

This invention relates to the field of galvanized steel wire technology, and proposes a high-strength galvanized steel wire and its preparation method. The preparation method of high-strength galvanized steel wire includes the following steps: activating the steel wire, then subjecting it to fluxing to obtain a pretreated steel wire; hot-dip galvanizing the pretreated steel wire, followed by passivation, to obtain high-strength galvanized steel wire; during fluxing, the flux consists of the following components by mass percentage: 20%~25% zinc chloride, 16%~20% ammonium chloride, 1.0%~2.0% additives, 1%~2% nickel chloride, 1%~2% lanthanum nitrate, 0.2%~0.5% ammonium bifluoride, with the balance being water; the additives are palmitamide propyl betaine and disodium lauryl sulfosuccinate. Through the above technical solution, the problem of insufficient wear resistance of galvanized steel wire in related technologies is solved.

The utility model relates to the technical field of environmental protection, in particular to a system for treating ammonia-containing waste gas of a PEVCD process by utilizing low-quality fluorine-containing waste water in the photovoltaic industry. Comprising a wastewater conveying pipe for fluorine-containing wastewater, an ammonia-containing waste gas absorption device, a membrane type solid-liquid concentration and separation device, an electrodialyzer, a wastewater storage tank for high-concentration fluorine-containing wastewater, a crystallization part, a drying part and a wastewater station, a set of system for treating the ammonia-containing waste gas generated by the PEVCD process by utilizing the low-quality fluorine-containing waste water generated in the photovoltaic industry is provided for the waste water and waste gas treatment industry, the ammonium bifluoride product can be prepared while the fluorine-containing waste water and the ammonia-containing waste gas are treated by utilizing the treatment system disclosed by the invention, and the treatment system has relatively good environmental protection property and also can be used for treating the ammonia-containing waste gas generated by the PEVCD process. Good economic benefits can be generated, and high practicability is achieved.

This invention belongs to the field of ammonium bifluoride purification technology, and specifically relates to a multi-stage filtration mechanism for ammonium bifluoride purification. The mechanism includes a tank with protective components on its outer surface, a discharge port at the bottom, a feed port on one side of the top, a motor in the center of the top, a rotating shaft at the motor's output end, a centrifugal drum at the bottom of the shaft, a flow guide platform below the centrifugal drum, and a bag filter at the bottom of the flow guide platform. This invention, through the cooperation of the motor, centrifugal drum, flow guide platform, bag filter, and activated carbon adsorption plate, enables the filtration mechanism to perform multi-stage filtration, avoiding the problem of poor impurity separation when filtration and purification of ammonium bifluoride in the liquid phase. Furthermore, the cooperation of the protective frame, rubber damping plate, rotating rod, and pressure relief cylinder prevents the surface of the device from easily denting or cracking after external impact.

The invention discloses porous ferric fluoride, a preparation method and application of the porous ferric fluoride in a lithium ion battery, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: stirring Lewis alkali and iron-containing Lewis acid under a heating condition to form a clear solution, adding a carbon source into the clear solution, and stirring to form uniform slurry; adding ammonium bifluoride, continuously stirring, alternately washing the obtained precipitate with ethanol and acetone, centrifuging until the supernatant is colorless and transparent, and drying to obtain a precursor; and finally, uniformly grinding the precursor, performing heat treatment, naturally cooling to room temperature, and fully grinding to obtain the porous ferric fluoride. The preparation process is simple and safe, the cost is low, the use of dangerous chemicals hydrofluoric acid and nitrogen fluoride is avoided, and large-scale synthesis can be realized; the prepared ferric fluoride has a porous morphology, is beneficial to electrolyte infiltration, ensures that the electrical contact between active particles is not influenced while the active material is in full contact with the electrolyte, and improves the electrochemical performance.

The application discloses a recycling method of NF3 electrolysis residual solution and relates to the technical field of electrolysis residual solution recycling treatment. The method comprises the following steps: step 1: removing Fe ions in the electrolysis residual solution; first, hydrogen peroxide or oxygen is added into the electrolysis residual solution to oxidize the divalent iron ions into trivalent iron ions, and then ammonia water and sodium hydroxide or ammonium hydrogen carbonate and sodium hydroxide are added into the solution to react, so that the trivalent iron ions are precipitated in the form of iron hydroxide; step 2: the electrolyte solution after the removal of iron is adjusted to a pH of 3-12 by adding hydrofluoric acid, enters an extraction system, extracts the nickel element in the ammonium hydrogen fluoride, and purifies the ammonium hydrogen fluoride; and step 3: the nickel element separated from the electrolyte solution enters a second extraction to synthesize a nickel sulfate product.

This invention discloses a radiation-resistant glass, its preparation method, and its application. The radiation-resistant glass comprises the following components in weight percentage: silicon dioxide 60%-70%; sodium oxide 13%-18%; zinc oxide 3%-6%; aluminum oxide 2%-6%; boron trioxide 1%-6%; strontium oxide 1%-3%; cerium dioxide 4.7%-5.5%; lanthanum trioxide / hafnium dioxide 1%-3%; and ammonium difluoride 0.3%-1%. The technical problem to be solved is to significantly improve the high-energy particle radiation protection and light transmittance of the glass by selecting a specific formulation.

The invention discloses a steel pipe cleaning mixed solution, a preparation method thereof and a method for cleaning pollutants on the surface of a steel pipe, and belongs to the field of metal surface treatment. The invention aims to solve the problems of low cleaning efficiency, non-uniform surface treatment effect, poor system stability and the like due to the adoption of a single acidic medium or a simple compound system in the traditional steel pipe cleaning method. According to the method, a mixed solution composed of nitric acid, ammonium bifluoride, sodium sulfate, 1-hydroxyethylidene-1, 1-diphosphonic acid, pyridinium propane sulfonate, a brightener, an emulsifier and water is adopted as a steel pipe cleaning medium. The steel pipe cleaning agent is scientific in formula component matching, high in cleaning efficiency, capable of effectively improving the surface state of a steel pipe, simple, convenient and feasible in operation process, environmentally friendly, suitable for batch cleaning treatment of related steel pipes and good in practicability and economical efficiency.

This invention provides a MoTi film composite etchant composition, relating to the field of metal film etching technology. The composite etchant composition comprises hydrogen peroxide, ammonium hydrogen fluoride, a weak organic acid, a corrosion inhibitor, cis-1,4-cyclohexanedicarboxylic acid, 3-amino-1,2,4-triazole, a complexing agent, iminodiacetic acid, an organic alcohol, and water; and the ratio of ammonium hydrogen fluoride to cis-1,4-cyclohexanedicarboxylic acid is ≥0.2. This invention overcomes the shortcomings of existing technologies, effectively improving the etching efficiency of MoTi films while reducing erosion of adjacent metal layers, achieving precise control of the etching rate, ensuring etching stability, and significantly improving product yield.

The invention discloses a preparation method of lithium difluoro (oxalato) borate. Lithium hydroxide, trimethyl borate, dimethyl oxalate and anhydrous ammonium bifluoride steam are used as raw materials to react in an ionic liquid medium. The method adopts a plasma activation technology, can be efficiently carried out in a low-temperature environment without traditional heating, not only shortens the reaction period, but also can inhibit fluorine source decomposition, oxalate hydrolysis and other side reactions, improves the selectivity of a target product, and uses the ionic liquid as a reaction medium, and the high polarity and low volatility of the ionic liquid can ensure the uniform dispersion of raw materials. Meanwhile, supercritical carbon dioxide extraction replaces traditional recrystallization, one-step purification is achieved by means of the selective dissolution characteristic of supercritical carbon dioxide extraction, the process steps are simplified, and solvent residues are reduced.

The invention is applicable to the technical field of titanium alloy surface treatment, and provides a titanium alloy nitric-acid-free chemical polishing solution and a preparation method thereof, and every 1L of the polishing solution comprises the following components: 100-150g of ammonium bifluoride, 150-250g of hydrogen peroxide with the concentration of 50%, 200-350g of phosphoric acid with the concentration of 85%, 60-120g of modified ethylene glycol, 10-20g of a compound stabilizer, 5-10g of a modified corrosion inhibitor and the balance of water. The modified ethylene glycol is ethylene glycol modified by a silane coupling agent KH550, and the modified corrosion inhibitor is a modified product of thiourea grafted maleic anhydride; through raw material modification and component synergy, the titanium alloy surface treatment effect can be improved, generation of nitric oxide toxic gas can be completely eradicated, decomposition of hydrogen peroxide and excessive corrosion of titanium alloy are avoided, and the polishing solution is suitable for efficient and environment-friendly polishing of titanium alloy parts in complex shapes.

The application relates to the technical field of battery recycling, and particularly discloses a recycling method of waste lithium ion battery negative electrode material and a lithium ion secondary battery. The recycling method comprises the following steps: discharging and disassembling and separating the waste lithium ion battery to obtain a waste shell, waste positive electrode material, waste negative electrode material and waste diaphragm material; crushing and screening the waste negative electrode material to obtain waste negative electrode powder; mixing the waste negative electrode powder with ammonium hydrogen fluoride, and baking the mixture in an inert gas atmosphere at 100-500 DEG C for a preset time; performing water immersion treatment on the baking product, and performing solid-liquid separation on the obtained slurry to obtain a first leaching solution and regenerated negative electrode material; mixing and reacting the first leaching solution with a reducing agent, and performing solid-liquid separation to obtain a second leaching solution and copper residue; mixing and reacting the second leaching solution with alkali, and performing solid-liquid separation to obtain a third leaching solution and positive electrode precursor residue; and concentrating the third leaching solution to obtain recycled ammonium hydrogen fluoride. According to the application, green closed-loop recycling of various materials can be realized, and the energy consumption is low.

The invention relates to the technical field of electrochemical polishing solutions, in particular to a nickel-titanium alloy electrochemical polishing solution and a preparation method thereof.The nickel-titanium alloy electrochemical polishing solution is prepared from, by mass, 20-25 parts of sulfamic acid, 10-15 parts of citric acid, 2.5-3.5 parts of ammonium bifluoride, 0.5-1.2 parts of sodium fluoborate, 0.8-1.5 parts of molybdenum-vanadium composite passivator, 1.5-2.5 parts of 1-hydroxyethylidene-1, 1-diphosphonic acid and 0.2-0.4 part of polyaspartic acid. 0.1-0.3 part of a nonionic surfactant, 15-20 parts of a hydrophilic organic solvent and 35-45 parts of deionized water. Through the synergistic effect of the sulfamic acid-citric acid polybasic acid system and the molybdenum-vanadium composite passivating agent and the assistance of the specific non-ionic surface active agent, synchronous optimization of surface roughness and glossiness is achieved, and the corrosion resistance of the polished nickel-titanium alloy surface is remarkably improved.

The invention relates to the technical field of metal coating, in particular to a metal surface coating process and a production line. The coating process comprises the following steps that the metal surface of a workpiece is sequentially subjected to polishing, degreasing, corrosion and coating treatment; a degreasing fluid used in the degreasing treatment comprises 5 wt%-10 wt% of sodium carbonate, 1 wt%-3 wt% of sodium silicate, 2 wt%-4 wt% of sodium gluconate, 0.5 wt%-2 wt% of a functional auxiliary agent, 1 wt%-2 wt% of a surfactant and the balance of water. An etching solution used in the etching treatment comprises 8 wt%-12 wt% of phosphoric acid, 3 wt%-5 wt% of citric acid, 0.05 wt%-0.3 wt% of ammonium bifluoride, 2 wt%-5 wt% of a functional auxiliary agent, 0.1 wt%-0.3 wt% of alkynol and the balance of water; the functional auxiliary agent comprises a first group which can be ionized under an alkaline condition, a second group which can be protonized under an acidic condition, and a third group with metal coordination capability. The formula of the degreasing liquid and the corrosion liquid is adjusted, so that the method is more suitable for metal surface treatment of light metal such as aluminum and magnesium alloy.

The invention provides a silicon dioxide and amorphous indium tin oxide selective etching solution. The silicon dioxide and amorphous indium tin oxide selective etching solution comprises an alcohol substance, a fluorine-containing substance, a corrosion inhibitor, a surfactant and the balance of water. The alcohol is one or a combination of more of ethylene glycol, polyethylene glycol, glycerol, isooctanol or isopropanol. The fluorine-containing substance is one or a combination of more of hydrofluoric acid, ammonium fluoride or ammonium bifluoride. The etching inhibitor is one or a combination of more of N, N-diisopropylethylamine, 2-hexylbenzimidazole, hydroxyethylidene-1, 1-diphosphonic acid, 5-oxo-4, 5-dihydropyrazolo [1, 5-a] pyrimidine-3-formonitrile or 5-chloro-[1, 2, 4] triazolo [1, 5-a] pyrimidine. The surfactant is one or a combination of more of polyethylene glycol mono-p-tert-octylphenyl ether, polyethylene glycol-propylene glycol monobutyl ether or coconut oil fatty acid diethanolamide. The etching solution can quickly remove a silicon dioxide deposition layer on the premise that the etching rate of amorphous indium tin oxide is smaller than or equal to 0.03 nm / min, the etched surface of silicon dioxide is smooth after etching, and etching of silicon dioxide and amorphous indium tin oxide has a high selection ratio.

The invention relates to the field of thermal batteries, and discloses a FeF3 / FeOF composite positive electrode material with a heterostructure and a preparation method of the FeF3 / FeOF composite positive electrode material. The preparation method comprises the following steps: dissolving ferric salt in an alcohol reagent added with an additive, then dropwise adding an ammonium fluoride or ammonium bifluoride aqueous solution to prepare an iron trifluoride hydrate compound, and further preparing the FeF3 / FeOF thermal battery positive electrode material with a heterostructure through a roasting method. Wherein the appearance of FeOF can introduce out-phase energy level, the FeOF and FeF3 form a Schottky heterojunction, a built-in electric field of a compound interface is formed, the migration rate of electrons and ions in a material body phase is promoted, and the instantaneous discharge power is improved. In addition, the interface of the FeF3 / FeOF compound is also an important active site for storing ions, so that the specific capacity of the material is improved.

The invention discloses a safety management method and system under preparation of flaky ammonium bifluoride based on Internet of Things, relates to the field of product process management, and solves the problem of insufficient safety of existing flaky ammonium bifluoride preparation. The method comprises the following steps: S1, monitoring the preparation process of flaky ammonium bifluoride to obtain preparation process information; s2, environmental parameters in the preparation process are obtained, and threshold judgment is conducted on the environmental parameters; chemical substances in the preparation process are obtained, and the consumption amount and the generation amount of different chemical substances are calculated to obtain a preparation proportion; s3, analyzing the environment parameters and an environment threshold value, and constructing an environment model; analyzing the preparation proportion and the chemical substance information, and constructing a substance safety model; combining the environment model with the material safety model to obtain a preparation safety model; s4, setting multi-stage early warning for the prepared security model; the preparation method can effectively improve the preparation safety of the flaky ammonium bifluoride.