8 results about "Phosphate conversion coating" patented technology

This invention provides a method for preparing a lithium-rich manganese-based cathode material modified with red phosphorus, a cathode sheet, and a lithium-ion battery, comprising: mixing the lithium-rich manganese-based cathode material with red phosphorus at a mass ratio of 1:0.001 to 0.01, and calcining it at 300 to 600°C for 1 to 6 hours under vacuum to obtain the red phosphorus-modified lithium-rich manganese-based cathode material; the general chemical formula of the lithium-rich manganese-based cathode material is: Li 1+x Mn 1‑x1 Ni 1‑x2 Co 1‑ x3 O2. This method uses inexpensive raw materials and involves a simple reaction process. After red phosphorus is sublimated by high-temperature heating, it undergoes a gas-solid interface reaction with lithium-rich manganese-based cathode materials, forming a phosphate coating on the cathode surface. Simultaneously, spinel and oxygen vacancies are formed, achieving phosphorus doping inside the cathode. This effectively improves the reversibility and structural stability of the anion redox reaction of lithium-rich manganese-based cathode materials, enhancing the material's initial coulombic efficiency, reversible specific capacity, and long-term cycle stability.

A hot-stamped steel includes a base material that is made of steel, a plated layer that is formed on a surface of the base material, and a phosphate coating that is formed on a surface of the plated layer; The chemical composition of the plated layer contains 20.00 to 45.00% by mass of Al, 10.00 to 45.00% by mass of Fe, 4.50 to 15.00% by mass of Mg, 0.10 to 3.00% by mass of Si, 0.05 to 3.00% by mass of Ca, 0 to 0.50% by mass of Sb, 0 to 0.50% by mass of Pb, 0 to 1.00% by mass of Cu, 0 to 1.00% by mass of Sn, 0 to 1.00% by mass of Ti, 0 to 0.50% by mass of Sr, 0 to 1.00% by mass of Cr, 0 to 1.00% by mass of Ni, and 0 to 1.00% by mass of Mn with a remainder of Zn and impurities; The phosphate coating consists of zinc phosphate crystals containing 5.0 to 50.0% by mass of Mg and 0.5 to 5.0% by mass of Ca; and the amount of adhesion of the phosphate coating per surface is in the range of 0.1 to 10.0 g / m2.

The invention relates to a method for the recovery of valuable metals from anode sludge generated as a result of electroplating and / or electrochemical reactions, and the production of phosphate coating chemicals from the recovered valuable metals.

The invention relates to a self-repairing microcapsule which is characterized by being prepared by the following steps: (1) stirring and mixing melamine, formaldehyde and deionized water, and carrying out addition reaction under an alkaline condition to form a water-soluble transparent prepolymer A; (2) dissolving diethyl aluminum hypophosphite and lauryl sodium sulfate in deionized water, adding organosilane and toluene, emulsifying to form a stable emulsion B, slowly pushing the emulsion B into the prepolymer A to obtain a polymerization solution, and completing polycondensation coating; and washing to remove the excessive prepolymer A, and drying to obtain the self-repairing microcapsule. The self-repairing microcapsule synthesized in the invention is biodegradable, green and environment-friendly, conforms to the current thought of green development, and can also be used as a repairing agent for other porous materials. According to the inorganic phosphate coating disclosed by the invention, the self-repairing microcapsules and the passivated aluminum particles are added into the phosphate coating, so that an effect of physically resisting a corrosive medium can be achieved.

Provided is a grain oriented electrical steel sheet including a base metal steel sheet, an intermediate layer and an insulation coating, wherein: the intermediate layer is an oxide film; an average thickness of the oxide film is 2-500 nm; the insulation coating is a phosphate coating; an average thickness of the insulation coating is 0.1-10 μm. When grazing incidence X-ray diffraction is performed on the phosphate coating using a Co-Kα excitation source, the X-ray diffraction pattern has a diffraction peak originating from cristobalite-type aluminum phosphate at a diffraction angle of 2θ=24.8°; a half value width FWHM0.5 of the diffraction peak under a diffraction condition with an X-ray incident angle ω=0.5° and a half value width FWHM1.0 of the diffraction peak under a diffraction condition with an X-ray incident angle ω=1.0° satisfy 0.20°≤FWHM0.5≤2.00°, 0.20°≤FWHM1.0≤2.00°, and 0°≤|FWHM0.5−FWHM1.0|≤1.00°.

A method for applying phosphate coatings, comprising the following steps: - providing a phosphatizing bath containing zinc Zn; - electrodepositing at least part of the metals contained in the bath on a workpiece to be treated by means of current pulses.

The present invention relates to a process for preparing a metallic workpiece for cold forming by contacting at least one metallic surface thereof with an aqueous acidic phosphating solution to form at least one phosphate coating, comprising step 1 to step 6, wherein 1) a roughness value of the metallic workpiece is determined, 2) a surface A of the metallic workpiece is determined, 3) a current density is determined from a surface A of the metallic workpiece, 4) a factor FS is determined, using the current density determined in step 3, 5) phosphating is carried out electrolytically, whereby FS ≤ 200 A s / dm2 and 6) coating weight and optionally coating adhesion are determined, to a metallic workpiece, which has been coated with at least one phosphate coating according to the aforementioned process or to a metallic workpiece, which has been coated with at least one phosphate coating according to the aforementioned process and additionally with at least one lubricant layer, to a use of the metallic workpiece, which has been coated with at least one phosphate coating or with at least one such phosphate coating and additionally with at least one lubricant layer for cold forming or in sliding friction and to a metallic workpiece, which has been formed or forged by using the aforementioned metallic workpiece.

The present invention discloses a method for preparing a porous hydrophobic phosphate coating using titanium dioxide / urea-formaldehyde resin microcapsules. The method comprises: stirring a formaldehyde solution and urea at 50-70°C and a pH of 8-9 for 1 hour to react and generate a prepolymer; after the prepolymer is cooled to room temperature, titanium dioxide, an emulsifier, and an auxiliary agent are added, and stirring is performed at 50-70°C for 0.5 hour to acidify the pH of the system to 2-4; heating the prepolymer to 50-70°C and maintaining the temperature for 2-3 hours, filtering the prepolymer after cooling, washing the prepolymer with distilled water, and drying the prepolymer. During the heating and curing process of the phosphate coating, the capsule wall of the microcapsules in the present invention is thermally decomposed, leaving micron-sized circular holes on the surface of the coating, which facilitates the subsequent construction of micro-nanostructures to improve hydrophobic properties. The core titanium dioxide remains inside the coating, improving the wear resistance of the coating.