8 results about "CHROMIC NITRATE" patented technology

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 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 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 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.