20 results about "CHROMIC NITRATE" patented technology

The invention relates to the technical field of preparation methods of nano precursor powder, in particular to a synthesis method of Cr < 3 + > doped magnesium aluminum oxide nano powder, which comprises the following steps: weighing magnesium nitrate, aluminum nitrate and chromic nitrate according to the stoichiometric ratio of MgAl2-xO4: xCr < 3 + >; stirring and mixing the prepared magnesium nitrate solution, aluminum nitrate solution and chromic nitrate solution together to prepare a mixed solution I; ammonia water is dripped into the first mixed solution, then the first mixed solution dripped with the ammonia water is stirred and mixed, and a second mixed solution is prepared; pouring the mixed solution II into a high-pressure reaction kettle, and putting the high-pressure reaction kettle into a constant-temperature box for reaction to prepare a white precipitate; adding deionized water into the white precipitate for washing and precipitating, and centrifuging to obtain white precipitate powder; drying the white precipitate powder at a constant temperature; calcining the dried white precipitate powder to prepare nano precursor powder; the prepared nanometer precursor powder has the advantages of being high in purity and small in particle size.

The invention discloses a catalyst Cr, Co-Ni (OH) 2 (at) NF based on a nickel base. The catalyst is prepared by taking foamed nickel (NF) as a carrier and doping Cr and Co elements, has efficient urea oxidation reaction (UOR) performance, and can be used for hydrogen production by electrolysis of water and urea pollution treatment. The preparation method comprises the following steps: soaking nickel foam in an HCl solution, soaking the nickel foam in a nickel salt solution with a specific concentration for reaction to generate nickel-based hydroxide, and soaking the nickel-based hydroxide in a solution containing chromic nitrate and cobalt potassium cyanide for reaction to finally generate the catalyst doped with Cr and Co. The catalyst shows low overpotential and good stability in a 1M KOH + 0.33 M urea solution, the overpotential of an anode for hydrogen production through electrolysis of water is remarkably reduced, and meanwhile efficient degradation of urea is achieved.

The invention relates to an electroplated coating protective agent and a preparation method thereof, and belongs to the technical field of electroplated coating protective agents, and the protective agent comprises the following raw materials: main salt, auxiliary salt, a composite complexing agent, 1-docosanethiol, a sealing agent, absolute ethyl alcohol and deionized water. The succinic acid, the N-sodium lauroyl sarcosinate and the citrazinic acid are used as the composite complexing agent, and starting from different aspects of activating the surface of the coating, accelerating the growth of the protective film layer and increasing the compactness of the protective film layer, the prepared protective agent can effectively improve the corrosion resistance effect of the coating; and the added 1-docosanethiol is used for reducing the defect area of the protective film layer and further effectively improving the corrosion resistance of the protective film. Besides, chromic nitrate is used as a main salt, cerous sulfate and sodium molybdate are used as auxiliary salts, and sodium silicate is used as a sealing agent, so that the prepared protective agent can effectively have remarkable salt spray resistance, and meanwhile, the appearance quality of a formed film layer can also be improved.

The invention relates to the field of ceramic ink, and discloses a black pigment, ceramic ink prepared from the black pigment and a preparation method of the ceramic ink. The high-tinting-strength cobalt black pigment is prepared by adopting cobalt nitrate, nickel nitrate, chromic nitrate and ferric nitrate according to the molar ratio of 38: 6: 31: 25, co-precipitating, drying to obtain powder, and calcining at the temperature of 1100-1200 DEG C to obtain the high-tinting-strength cobalt black pigment. The ink prepared from the high-tinting-strength cobalt black pigment prepared by the preparation method disclosed by the invention is pure in hue and strong in tinting strength, is particularly suitable for producing dark-color ceramic tile layout products such as black golden flowers and the like, and can well solve the problem that the black color is not pure enough.

The invention discloses a graphene-doped high-entropy Prussian blue analogue material as well as a preparation method and application thereof, and belongs to the technical field of materials. The preparation method comprises the following steps: preparing a high-entropy Prussian blue analogue from nickel nitrate hexahydrate, iron nitrate nonahydrate, cobalt nitrate hexahydrate, chromium nitrate nonahydrate, zinc nitrate hexahydrate, potassium ferricyanide and graphene to form a turbid liquid, collecting a solid material in the turbid liquid by using a centrifugal method, cleaning with ethanol and deionized water, and drying to obtain the high-entropy Prussian blue analogue. And drying and grinding to obtain the high-entropy prussian blue analogue material which can effectively perform electro-catalytic oxygen evolution under an alkaline condition. The graphene-doped high-entropy Prussian blue analogue is prepared by a coprecipitation method, and the method has the characteristics of simplicity in operation, short preparation period, low cost and the like, and is beneficial to popularization and application.

The invention relates to the field of passivation solutions, and particularly discloses a trivalent chromium black zinc passivation solution free of fluorine, nickel and phosphorus and a preparation process of the trivalent chromium black zinc passivation solution. The passivation solution comprises the following components: 400-600 g of pure water, 10-15 g of chromic nitrate, 1-3 g of maleic acid, 2-4 g of tartaric acid, 3-5 g of citric acid, 1.5-3 g of borax, 3-5 g of sulfosalicylic acid, 5-8 g of ferrous sulfate, 4-6 g of sodium nitrate, 2-4 g of a corrosion inhibitor, 1-1.5 g of a membrane surface conditioning agent, 1-3 g of an antioxidant and 2-5 g of a blackening enhancer. A complexing system is adopted to stabilize release of trivalent chromium ions, a passivation film layer is compact, uniform and not prone to floating, stable generation of the passivation film is facilitated, the passivation time range is wide, and the corrosion inhibitor is added for efficient corrosion inhibition; the blackening effect of the combined action of the blackening enhancer containing the molybdenum element and ferrous ions is adopted, and through the synergistic effect of the corrosion inhibitor, the blackening enhancer and other raw materials, the existing technical problems that an existing passivation solution is poor in appearance texture, high in equipment corrosion, insufficient in environmental protection property, low in film forming stability, high in blackening system cost, large in pollution and the like are solved.

The invention provides a preparation method of a hole sealing coating for a plasma spraying thermal barrier coating, and relates to the technical field of high-temperature thermal insulation materials. The hole sealing coating comprises the following raw materials in parts by weight: 40-50 parts of ammonia water (with the concentration of 25%), 30-50 parts of enamel powder, 30-50 parts of functional powder, 20-30 parts of zirconium oxychloride, 20-30 parts of yttrium chloride, 5-10 parts of ytterbium nitrate, 5-10 parts of gadolinium nitrate, 5-10 parts of dysprosium nitrate, 5-10 parts of chromic nitrate, 5-10 parts of tantalum pentoxide, 5-10 parts of niobium pentoxide, 3-5 parts of titanium dioxide, 3-5 parts of silicon dioxide, 3-5 parts of a binder, 60-90 parts of absolute ethyl alcohol and 40-60 parts of a solvent. The nano ceramic powder is prepared by using a hydrothermal reaction method, then the enamel powder, the nano ceramic powder and the like are mixed, wet grinding, drying, tabletting and calcining are performed to prepare a ceramic block which is applied to film plating, and the hole sealing coating is high in density and bonding strength, and can slow down the transmittance of oxygen, improve the oxidation resistance, improve the radiation coefficient of the coating and prolong the service life.

The invention discloses a high-wear-resistance and corrosion-resistance sintering machine grate and a preparation method thereof, and belongs to the technical field of metallurgical materials. The method comprises the following steps: selecting polystyrene foam plastic to prepare a foam model; the preparation method comprises the following steps: preparing high-entropy oxide nano powder from ferric nitrate, chromic nitrate, nickel nitrate, manganous nitrate and ammonium molybdate according to a mass ratio, stirring, precipitating, drying, calcining and ball-milling to obtain powder; preparing a water-based binder from polyvinyl alcohol, hydroxypropyl methyl cellulose, lauryl sodium sulfate, p-benzoquinone imine and deionized water according to a mass ratio; preparing an inner-layer coating solution from high-entropy oxide nano powder and a binder in proportion, dip-coating the foam model, and drying to form an inner layer; preparing an outer layer coating solution from nano chromium powder and a binder according to a ratio, and performing dip-coating and drying to form an outer layer; filling refractory sand, pouring high-chromium cast iron alloy melt, and demolding; and tempering at low temperature and strengthening the nano permeation layer. The grate substrate and the double-layer nano coating are cooperated, so that the service life is prolonged, and the cost is reduced.

The invention belongs to the technical field of metal surface treatment, and discloses an efficient and low-corrosivity ash removal agent as well as a preparation method and application thereof. The ash removal agent comprises the following components: organic acid, an oxidizing agent, organic amine ester TPP, methylbenzotriazole, polyaspartic acid, a complexing agent, a nonionic surfactant and water. The ash removal agent is high in ash removal efficiency and small in corrosion to an aluminum (alloy) matrix, and meanwhile, the ash removal agent does not contain nitric acid, chromic anhydride and other ammonia nitride components which severely pollute the environment.

The present invention discloses a surface treatment method for an aluminum foil current collector and a battery electrode. The surface treatment method comprises the following steps: S1, preparing a first treatment liquid of phosphoric acid or nitric acid with a mass concentration of 1 to 10%, immersing the aluminum foil in the first treatment liquid, and ultrasonically cleaning the aluminum foil for 0.1 to 10 minutes; S2, adding a chromium-containing compound, a polyacrylic resin, and a fluoride to deionized water to prepare a second treatment liquid, wherein the chromium-containing compound is chromium phosphate or chromium nitrate, and the fluoride is one or more of chromium fluoride, magnesium fluoride, ammonium fluoride, and hydrofluoric acid; rolling the second treatment liquid onto the surface of the aluminum foil obtained in step S1, and drying the liquid to obtain the aluminum foil current collector. The first and second treatment liquids of the present invention have simple formulations and a simple process. The prepared aluminum foil can achieve a dyne value of 55 or above, significantly improves corrosion resistance in electrolyte, and enhances adhesion to the carbon coating layer.

The application discloses a camouflage coating simulating spectral reflection characteristics of green vegetation and a preparation method thereof. The camouflage coating is prepared by adopting a solution casting method after a mixed solution is configured according to a mass ratio of 1:(0.5-2):(0.01-0.1) of chromium modified molecular sieve, a film forming agent and a defoaming agent. The chromium modified molecular sieve is obtained by ion exchange of X-type molecular sieve and a chromium nitrate solution. The spectral similarity of the camouflage coating prepared by the application to green vegetation can reach 0.947, and the camouflage coating has similar spectral reflection characteristics of green vegetation leaves. Meanwhile, the camouflage coating overcomes the defects of traditional camouflage, such as not having a "water absorption valley" spectral characteristic in a near-infrared spectral band.

The invention relates to the field of metal surface treatment, and particularly discloses a gray passivation solution for zinc alloy and a passivation method. The gray passivation solution for the zinc alloy comprises the following components: 60-85 g / L of nickel chloride hexahydrate, 60-75 g / L of sodium thiocyanate, 5-10 g / L of ammonium chloride, 20-30 g / L of chromic nitrate nonahydrate, 10-15 g / L of cobalt chloride hexahydrate, 15-20 g / L of monopotassium phosphate, 40-60 g / L of zinc dihydrogen phosphate, 80-110 mL / L of a zinc nitrate solution, 20-30 g / L of manganese dihydrogen phosphate and 0.05-0.2 g / L of a surfactant, and a solvent of the gray passivation solution for the zinc alloy is pure water. The content of zinc nitrate in the zinc nitrate solution is 300g / L. The gray passivation solution for the zinc alloy has the advantages of being uniform in coating film surface, high in binding force and resistant to abrasion and corrosion.

The application discloses a kind of near-infrared long afterglow luminescent nano probes, its preparation method and application, belong to near-infrared long afterglow material field. With mesoporous silica as template, with zinc acetate, gallium nitrate, tin chloride, chromium acetate, chromium nitrate and yttrium nitrate as doped metal raw materials, long afterglow luminescent core is obtained by reaction and calcination;The outer layer of long afterglow luminescent core is coated with manganese dioxide, to obtain pre-product;Pre-product is surface modified, and coupling target molecule plerixafor, i.e. near-infrared long afterglow luminescent nano probe. The near-infrared long afterglow luminescent nano probe has good biological safety, can be effectively enriched in the tumor area in vivo after mouse tail vein injection, can realize high-sensitivity imaging of multiple small tumors in vivo under red light LED irradiation, and the imaging time is short, suitable for intraoperative imaging, can be used for the imaging of breast cancer tumor model to guide tumor resection.

An insulating coating composition for an electrical steel sheet, according to an embodiment of the present invention, comprises: 100 parts by weight of a metal phosphate; 30 to 350 parts by weight of silica; 30 to 350 parts by weight of chromium nitrate; 30 to 350 parts by weight of at least one shielding agent among dolomite, talc, carbonate, and feldspar; and 1 to 100 parts by weight of a carbon structure.

The invention provides a preparation method of an antibiotic adsorption material, and relates to the technical field of antibiotic treatment.The preparation method comprises the following steps that chromic nitrate nonahydrate, terephthalic acid, deionized water and hydrofluoric acid react to obtain a metal organic framework, and the metal organic framework is doped with activated carbon and then activated with urea to obtain the antibiotic adsorption material. The prepared antibiotic adsorption material has the advantages of large antibiotic adsorption capacity and excellent reproducibility.

The application discloses a preparation method and application of a binary oxide supported metal catalyst, and the preparation method comprises the following steps: mixing a metal salt solution, an organic ligand and an additive, or mixing a metal salt solution and an alkali solution, aging, drying and calcining to obtain the binary oxide supported metal catalyst; the metal salt solution is selected from at least two of magnesium nitrate, chromium nitrate, manganese nitrate, iron nitrate, cobalt nitrate, nickel nitrate, copper nitrate, zinc nitrate, gallium nitrate, silver nitrate, indium nitrate and stannous chloride. The application is matched with a continuous reactor-fixed bed, and the production efficiency of 2-methylpropenol is greatly improved. Under the condition that hydrogen is used as a reducing agent and without a solvent, the conversion rate of methylpropenal on the catalyst reaches 83%, the selectivity of 2-methylpropenol is 90%, and the catalyst can be stably operated for a long time.

The invention relates to the technical field of NTC thermistor ceramics, in particular to a composite ceramic preparation method and a composite ceramic. The preparation method of the composite ceramic comprises the following steps: preparation of a spinel phase raw material: weighing oxides of Mn, Cr, Y, Ni, La and Co in proportion, and carrying out ball milling, drying and pre-sintering to prepare primarily densified spinel phase powder; the preparation method comprises the following steps: preparing perovskite phase raw materials: weighing lanthanum nitrate, chromic nitrate and yttrium nitrate in proportion, dissolving in water, adding citric acid, stirring until the mixture is transparent, and preparing a La-Y-Cr mixed solution; formation of a core-shell structure: dispersing the spinel phase powder in water, heating after dispersion, slowly dropwise adding the La-Y-Cr mixed solution and ammonia water, and controlling the pH value to be 8-9 to form a core-shell structure precipitate with spinel as a core and La-Y-Cr hydroxide and citrate as a shell; and after centrifugal washing, drying and high-temperature calcination, the shell in the form of La-Y-Cr hydroxide and citrate is converted into a perovskite type coating layer.

The application discloses a preparation method, device and application of an iron-cobalt-nickel-chromium oxide catalyst. The preparation method of the iron-cobalt-nickel-chromium oxide material comprises the following steps: preparing an iron-cobalt-nickel layered hydroxide intermediate through electrodeposition under a certain current density condition, further passivating through a chromium nitrate solution and high-temperature treatment, and obtaining the iron-cobalt-nickel-chromium oxide catalyst material. The iron-cobalt-nickel-chromium oxide material can be applied to an electrocatalytic process as an anode catalyst and a cathode catalyst respectively, the Faraday efficiencies of anode oxygen evolution and cathode hydrogen evolution reactions can both reach and maintain above 90%, the device constructed by the application can maintain a stable cell voltage within 600 hours, and the high-efficiency effects of cathode hydrogen evolution and anode oxidation can be used in multiple fields such as removal of organic pollutants in water through anode oxidation and hydrogen production from seawater through cathodes, and have a relatively wide application prospect.

The present application relates to a kind of preparation methods of pure tantalum standard sample for trace element analysis, belong to the field of chemical standard sample preparation.The design ratio is added in potassium fluotantalate Quantitative aluminum nitrate, calcium nitrate, chromium nitrate, copper nitrate, iron nitrate, manganese nitrate, ammonium molybdate, niobium pentachloride, nickel nitrate, tin tetrachloride, ammonium hexafluorotitanate, ammonium paratungstate, and potassium chloride is added in proportion, after being mixed uniformly, potassium fluotantalate is reduced using sodium heat reduction process, the obtained tantalum metal particles are coarsely crushed by jaw crusher, purified in rotary pickling tank, then high-temperature heat treatment is carried out in vacuum induction furnace, and then hydrogenation, crushing, dehydrogenation, purification, grinding, homogenization treatment and tabletting are carried out to obtain pure tantalum standard sample candidate material.Classical chemical method and instrument method are used to carry out uniformity test, stability test and value determination on each value element in pure tantalum.

The invention provides a composite wave-absorbing material and a preparation method thereof.The preparation method comprises the steps that lanthanum nitrate, manganese acetate, calcium carbonate and chromic nitrate are dissolved in ethylene glycol monomethyl ether and stirred to be completely dissolved, a mixed solution is obtained, and the molar ratio of lanthanum nitrate to manganese acetate to calcium carbonate to chromic nitrate is 9: 9: 1: 1; drying the mixed solution to obtain dry gel; grinding the xerogel, and presintering at a first temperature to obtain first powder; sintering the first powder at a second temperature higher than the first temperature to obtain second powder; the second powder and ZnO are mixed according to a preset proportion and ground, and third powder is obtained; mixing and grinding the third powder and polyvinyl alcohol to obtain fourth powder; tabletting the fourth powder to obtain a ceramic wafer; and sintering the ceramic wafer at a third temperature. The preparation process is simple, industrial production is easy, and the prepared material has excellent electromagnetic wave absorption performance and mechanical performance.