13 results about "Chromic sulfate" patented technology

The application provides a weathering steel surface rust layer stabilizing treatment agent for industrial atmospheric environment, and the chemical composition of the weathering steel surface rust layer stabilizing treatment agent is as follows in terms of mass fraction: 25-45% of acrylic resin, 2.0-6.0% of chromium sulfate, 3.0-8.0% of ferrous oxide, 2.0-6.0% of ferric oxide, 0.5-3.5% of copper sulfate, 0.3-1.5% of sodium bisulfite, 1.0-6.0% of sodium molybdate, 0.5-3.5% of nickel sulfate, 2.0-5.0% of potassium phosphate, 0.05-0.5% of surfactant, 0.05-0.5% of defoaming agent, 0.05-0.5% of dispersing agent, 0.05-0.5% of thickening agent, and the balance is water, wherein the amount of plasticizer added is 2-5% of the resin. The stabilizing treatment agent in the application can promote the weathering steel surface to form a stable and dense rust layer within 0.5-1 year after the surface of the weathering steel is treated before use.

The invention discloses an additive for enhancing corrosion resistance of trivalent chromium oxidation liquid and a preparation method of the additive, and belongs to the technical field of chemical oxidation treatment.The additive is prepared from chromium sulfate, rare earth salt, a complexing agent, a corrosion inhibitor, gamma-mercaptopropyltriethoxysilane, tetraethoxysilane and water. Two kinds of silane which is insoluble or slightly soluble in water are compounded into an additive for enhancing the corrosion resistance, the additive is added into a trivalent chromium aqueous solution, and after corresponding process treatment, the corrosion resistance of trivalent chromium chemical oxidation treatment can be improved from less than 96 h to more than 336 h. The additive prepared by the invention can effectively improve the pitting corrosion resistance of the trivalent chromium oxide film, and the neutral salt mist resistance of the trivalent chromium oxide film is greatly improved.

The invention relates to the technical field of well cementation engineering, in particular to a multi-element micromolecule compounded high-temperature-resistant oil well cement retarder and application thereof. The multi-element micromolecule compounded high-temperature-resistant oil well cement retarder is prepared from the following raw materials in parts by weight: 20 to 30 parts of disodium 1-hydroxyethylidene-1, 1-diphosphonate, 5 to 10 parts of sodium tetraborate, 5 to 10 parts of sodium gluconate, 2 to 5 parts of chromium sulfate and 65 to 130 parts of water. The invention can effectively solve the problem of performance failure of the traditional oil well cement retarder caused by a large temperature difference environment with a bottom hole circulation temperature of more than 220 DEG C and more than 90 DEG C.

The valve comprises a valve body, a convex ring is arranged outside the valve body, the part, located at the bottom of the convex ring, of the valve body is wedge-shaped, a plurality of L-shaped locking blocks are arranged on the convex ring, one side of each locking block is in sliding connection with the convex ring, a magnetizer is fixed to the other side of each locking block, and the magnetizers and the locking blocks form a U-shaped structure. The valve electroplating process comprises the following steps: step 1, immersing a product into a cleaning furnace in which a deoiling agent is mixed with water, and leaching with clear water; 2, immersing in a nitric acid solution, and leaching with clear water; step 3, immersing into a cyanogen copper cylinder containing cuprous cyanide, sodium cyanide and potassium sodium tartrate, and rinsing with clear water; step 4, immersing into an acid copper cylinder containing copper sulfate, sulfuric acid and chloride ions, and rinsing with clear water; step 5, immersing into a bright nickel cylinder containing nickel sulfate, nickel chloride and boric acid, and rinsing with clear water; step 6, immersing in a cylinder containing chromic acid and chromium sulfate, and rinsing with clear water; and 7, the electroplating quality is inspected. The valve has the beneficial effect that the surface of the valve is not easy to corrode and rust.

The application provides a trivalent chromium passivation solution for maintaining the original color of aluminum alloy, which is prepared from basic chromium sulfate, zirconium salt, fluoride salt, corrosion inhibitor, organic acid complexing agent and water. The application also provides a preparation method of the trivalent chromium passivation solution for maintaining the original color of aluminum alloy, which comprises the following steps: heating water to 75-85 DEG C, then adding basic chromium sulfate, stirring while adding until completely dissolved, then adding zirconium salt, fluoride salt, corrosion inhibitor, organic acid complexing agent, silane coupling agent, water-soluble resin and nano silicon dioxide in sequence, and stirring for 1-2 h; using a pH regulator to adjust the pH value to 3.8-4.2, and the trivalent chromium passivation solution for maintaining the original color of aluminum alloy is obtained. The application also provides a passivation method for maintaining the original color of aluminum alloy. The application has the advantages of saving raw material cost, simple preparation method, and the like, and the passivated aluminum alloy part has a dense and uniform passivation film, the appearance color is maintained as the original color, the corrosion resistance exceeds 300 hours after neutral salt spray test, and the corrosion resistance is good.

The invention discloses an alloy and ceramic composite coating and a preparation method thereof. The preparation method comprises the following steps: adding raw materials including chromium sulfate, sodium tungstate, sodium molybdate, nickel sulfate, sodium sulfate, sodium citrate, boric acid and ceramic powder into a solvent to prepare an electroplating solution; after the surface of a base material is subjected to mechanical polishing, alkali washing oil removal, acid pickling activation and nickel pre-plating, the base material serves as a cathode and an anode electrode to be put into electroplating liquid together, a direct-current power source is adopted for electroplating, the electroplating voltage is selected to range from 10 V to 12 V, the current density is selected to range from 12 A / dm to 20 A / dm, electroplating deposition is conducted for 30 min to 70 min, and the alloy and ceramic composite coating is obtained. According to the preparation method disclosed by the invention, various metal alloys are electroplated on the surface of the diamond cutter by adjusting the electroplating potentials according to different electroplating potentials of different metals, so that the hardness, wear resistance and high-temperature stability of the diamond cutter are remarkably enhanced.

The invention discloses a high-temperature type trivalent chromium plating solution for high-speed chromium plating, which comprises the following active ingredients: 30-120 g / L of trivalent chromium main salt; the trivalent chromium main salt comprises at least one of basic chromium sulfate, chromium sulfate and chromium potassium sulfate; the content of the complexing agent is 90 to 150g / L; the complexing agent comprises at least two of formate, glycine, citric acid, citrate and urea; the content of the conducting salt is 100 to 200g / L; the content of the buffering agent is 30 to 50g / L; the content of the brightening agent is 1.5 to 3g / L; the content of the surfactant is 0.4 to 0.9 g / L; the content of the stabilizer is 4-8 g / L; the pH value of the trivalent chromium plating solution ranges from 1.5 to 4.5. According to the trivalent chromium plating solution, the deposition rate of the sulfate system trivalent chromium plating solution can be effectively increased, and a uniformly-distributed plating layer can be obtained within a short time.

The invention belongs to the technical field of electrolytic copper foil preparation, and discloses a low-chromium washing-free anti-oxidation liquid for an electrolytic copper foil, a preparation method of the low-chromium washing-free anti-oxidation liquid and a washing-free anti-oxidation process. The anti-oxidation liquid comprises the following components: chromium sulfate, ammonium molybdate, gamma-aminopropyltriethoxysilane, phytic acid, nano silicon dioxide, sodium tartrate, citric acid, a pH value regulator and water. According to the invention, the synergistic ratio of chromium sulfate, ammonium molybdate and gamma-aminopropyltriethoxysilane is limited, and nano silicon dioxide is introduced to enhance the compactness of the film layer, so that the chromium content is remarkably reduced, and meanwhile, efficient anti-oxidation protection under a washing-free condition is realized. The matched stepped hot air drying process further avoids the problem of copper foil warping caused by traditional high-temperature drying, and a more environment-friendly and more reliable surface treatment solution is provided for the electrolytic copper foil for the lithium ion battery.

The invention discloses a trivalent chromium plating solution for medium-temperature type high-speed chromium plating, which comprises the following active ingredients: 30-120 g / L of trivalent chromium main salt; the trivalent chromium main salt comprises at least one of basic chromium sulfate, chromium sulfate and chromium potassium sulfate; the content of the complexing agent is 70 to 135 g / L; the complexing agent comprises at least two of acetate, tartaric acid, oxalic acid, oxalate and malic acid; the content of the conducting salt is 80 to 150g / L; the content of the buffering agent is 20 to 40g / L; the content of the brightening agent is 0.1 to 1.2 g / L; the content of the surfactant is 0.01 to 0.25 g / L; the content of the stabilizer is 1-3g / L; and the pH value of the trivalent chromium plating solution is 3-6. The invention further discloses a preparation method and an electroplating method of the trivalent chromium plating solution.

The invention provides a method for preparing basic chromium sulfate from sodium-modified vanadium extraction wastewater, which comprises the following steps: sequentially mixing the sodium-modified vanadium extraction wastewater with a reducing agent and alkali liquor, and carrying out solid-liquid separation to obtain wet-based chromium hydroxide; mixing the first wet-based chromic hydroxide with sulfuric acid, stirring after standing, and adding the second wet-based chromic hydroxide while stirring to obtain an intermediate solution; and sequentially and circularly adding sulfuric acid and wet-based chromium hydroxide into the intermediate solution until the charging is finished, thereby obtaining the liquid basic chromium sulfate. According to the method provided by the invention, the sodium-modified vanadium extraction wastewater is converted into the wet-based chromium hydroxide with a certain water content, and the basic chromium sulfate is prepared through the process design of the reaction of the wet-based chromium hydroxide and the sulfuric acid, so that the product purity and the raw material utilization rate are improved, the energy consumption is remarkably reduced, and the method has a great industrial value.

The invention belongs to the technical field of extraction of vanadium oxide from vanadium slag, and relates to a method and a system for removing impurity silicon in sodium vanadium solution. The method comprises the following steps: S100, adjusting the pH value of the sodium vanadium solution, and maintaining the pH value of a solution system at 8.0-10.0 to obtain a pretreated sodium vanadium solution; s200, heating the pretreated sodium vanadium solution, and sequentially adding aluminum sulfate and chromium sulfate for deep removal reaction of Si to obtain reaction slurry; and S300, the reaction slurry is subjected to standing sedimentation and solid-liquid separation in sequence, and purified vanadium liquid is obtained. According to the method disclosed by the invention, low-dosage aluminum sulfate which is lower than the theoretical dosage of Al < 3 + > salt for silicon removal can be added into a sodium vanadium solution system, so that Si in the solution is precipitated and removed in the double hydrolysis reaction of Al < 3 + > and SiO3 < 2->, and Al is not brought into the solution.

The application discloses a kind of stabilizing treatment liquid, for 690MPa grade weathering bridge steel component each component mass percentage content: the content of ferric chloride is 3~7%; The content of sodium bisulfite is 1~2%; The content of chromium sulfate is 3~6%; The content of potassium permanganate is 1~4%; The content of polypropylene glycol is 1~2%; The content of sodium carboxymethyl cellulose is 2~5%; The rest is deionized water.This application also provides the treatment process of stabilizing treatment liquid and its application.The application can realize the rust layer stabilization treatment of 690MPa grade weathering bridge steel component, and the surface of 690MPa grade weathering bridge steel component after treatment forms the brown rust layer of uniform color, no rust liquid flow.

The utility model belongs to the technical field of chromic sulfate production equipment, especially relates to a feeding device for base type chromic sulfate production, including feeding device body, the feeding device body includes feeding mechanism, one side of feeding mechanism is provided with the mechanism of containing material, the output of auger conveyor is provided with the isolation subassembly, the below of isolation subassembly is provided with the material storage subassembly, the below of material storage subassembly is provided with the material discharge subassembly that gathers and divides the function in one, the mechanism of containing material includes the frame, the inside of frame is provided with the casing of U shape design, be provided with stirring subassembly in the casing, the utility model discloses reasonable in design, simple structure, processing is convenient and can realize the acceptance of production material on one hand, guarantees the smooth development of conveying work, can realize the quantitative export of conveying material on the other hand, prevents the material from piling up, ensures its subsequent dispersion effect, guarantees the smooth development of processing work, improves work progress, satisfies the use demand.