24 results about "Electrochemical anodization" patented technology

The invention provides an anodic oxidation passivation method of a neodymium-iron-boron permanent magnet zinc coating, which comprises the following steps of: performing electrochemical anodic oxidation by taking a neodymium-iron-boron permanent magnet with a zinc coating on the surface as an anode, a Pt sheet as a cathode and a passivation solution as an electrolyte, forming a passivation layer on the surface of the neodymium-iron-boron permanent magnet with the zinc coating on the surface, and cleaning and drying to obtain the neodymium-iron-boron permanent magnet with the zinc coating on the surface. A chromium-free passivation film is formed on the neodymium-iron-boron permanent magnet zinc coating, and passivation of the neodymium-iron-boron permanent magnet zinc coating is completed; the passivation solution is prepared from 10 g / L to 20 g / L of molybdate, 10 g / L to 15 g / L of ammonium fluozirconate, 1 g / L to 10 g / L of etidronic acid, 1 g / L to 10 g / L of sodium dihydrogen phosphate, 1 g / L to 10 g / L of nitric acid, 1 g / L to 10 g / L of phosphoric acid and the balance distilled water. According to the method disclosed by the invention, a complete, uniform and compact passivation film is formed on the surface of the zinc coating after passivation, the corrosion potential is improved while the corrosion current is effectively reduced, and the time for generating a rust spot in a salt spray test exceeds 72 hours.

The invention discloses a ternary alloy hydrogen production electrode which is prepared by the following steps: 1) carrying out electrochemical anodic oxidation treatment on a Ni-Cr-Fe ternary alloy foil to obtain an initial state foil; 2) carrying out carbonitriding treatment on the initial-state foil to obtain an intermediate-state foil; and 3) carrying out CV activation treatment on the intermediate-state foil to obtain the ternary alloy hydrogen production electrode. According to the preparation method, after the foil is subjected to carbon-boron co-permeation treatment and CV activation treatment, the obtained alloy foil has excellent performance in the subsequent electrocatalytic water oxidation process, and B atoms can accelerate electrochemical self-optimization to generate more high-activity Ni < 3 + > and Fe < 3 + > catalytic sites; c atoms can stabilize related active sites through metal carbon bonds, efficient and stable water electrolysis oxygen evolution catalytic performance can be achieved through the synergistic effect of the two, and the catalyst is suitable for being used and popularized in the field of catalysis.

The invention discloses a low-platinum-loaded Pt / NiFe (CN) 5NO self-supporting electrode as well as a preparation method and application of the low-platinum-loaded Pt / NiFe (CN) 5NO self-supporting electrode. A platinum sheet is used as an anode, a hydrochloric acid aqueous solution of nickel chloride and potassium ferricyanide is used as an electrolyte, and a Pt / NiFe (CN) 5NO self-supporting electrode is obtained by deposition at a cathode through an electrochemical anodic oxidation coupling electrodeposition reaction; the electrode has excellent oxygen evolution performance, self-supporting electrodes with different structures and compositions are obtained on the metal surface by controlling electrolyte components, reaction temperature, reaction voltage and reaction time, and the electrocatalytic activity and stability of the composite self-supporting electrode are improved; while the deposition amount of platinum is controlled, nickel and iron elements are compounded, the oxygen evolution performance of the self-supporting catalyst is improved by utilizing a synergistic effect, the problem of agglomeration or falling of the catalyst is avoided, the catalytic activity is enhanced, and the self-supporting catalyst has a wide application prospect in the aspect of industrial production.

The invention relates to a method for preparing 2-aryl-3-difluoromethyl benzothiophene by utilizing an electrochemical reaction. Specifically, the invention provides an electrochemical anodic oxidation cathode reduction characteristic instead of a traditional chemical oxidation reducing agent, sodium difluoromethanesulfinate is used as a difluoromethyl donor, and a difluoromethyl free radical is excited through electrochemical anodic oxidation, so that the difluoromethyl free radical is synthesized. The preparation of the target molecule 2-aryl-3-difluoromethyl benzothiophene is realized through intramolecular cyclization initiated by addition of free radicals to active alkyne. The method does not need to add an additional transition metal catalyst and a super-stoichiometric redox agent, has the advantages of mild reaction conditions, high product yield, good chemical selectivity and the like, better conforms to the purpose of green and sustainable development of the current society, and has a good industrial application prospect.

The invention relates to a preparation method of a low-temperature deposited silicon dioxide passivation layer, which comprises the following steps of: firstly, selecting an n-type silicon wafer etched with a pyramid structure, and cleaning to remove pollutants on the surface of the n-type silicon wafer; h2SO4 and H2O in a volume ratio of 2: 50 are mixed to form a 5% dilute sulphuric acid aqueous solution; secondly, taking the pretreated n-type silicon wafer as a working electrode and platinum as a counter electrode, connecting an electrochemical workstation and setting a constant potential mode; applying 0.8 V voltage to the counter electrode at the normal temperature of 20-27 DEG C, and growing a 2-5nm silicon dioxide passivation layer on the substrate n-type silicon wafer; and finally, after deposition of the silicon dioxide passivation layer is completed, washing the silicon wafer with deionized water, and carrying out nitrogen blow-drying or normal-temperature airing. The method is realized through electrochemical anodic oxidation: the working temperature is the normal temperature of 23-27 DEG C, spontaneous heating is performed to 80 DEG C, the energy consumption is only 3-5% of that of a thermal oxidation method, the equipment requirement is low, and the method can be realized through a standard electrochemical workstation.

Corrosion-inhibiting coating for metallic substrates comprising a brittle aluminum alloy and a binder. Composition of a corrosion-inhibiting coating for a metallic substrate, the coating composition comprising a film-forming binder and powdered aluminum alloy particles. The aluminum alloy comprises silicon in an amount of 1% to 30% by weight, as well as one or more elements, selected from a first group, which includes an element enhancing embrittlement and / or an element enhancing electrochemical anodizing.

The invention provides a double-layer nano-pore structure on the surface of an aluminum material, a preparation method of the double-layer nano-pore structure and application of the double-layer nano-pore structure in an aluminum stranded conductor, and the method comprises the following steps: performing electrochemical anodic oxidation in electrolyte by taking the aluminum material to be treated as an anode strip to form a nano-pore structure on the surface of the aluminum material; the voltage of electrochemical anodic oxidation is square wave voltage. According to the method, the aluminum material serves as the anode, the square wave voltage is adopted for electrochemical anodic oxidation, the double-layer nanopore structure sequentially comprising the first nanopore layer and the second nanopore layer from the surface to the inner core is formed on the surface of the aluminum material, and the structure is good in binding force with the surface of the aluminum material and high in stability; the aluminum stranded wire has the characteristics of high porosity, uniform distribution, good continuity of upper and lower layers, no defect and the like, can significantly increase the storage amount of lubricating oil and prolong the service life of the super-lubricated surface, thereby greatly enhancing the anti-icing performance of the aluminum stranded wire, and improving the application prospect in the field of power transmission.

This invention relates to a method for esterifying alkyl aromatics and amides via benzylic radical polarity reversal, belonging to the field of compound preparation technology. This invention leverages the advantages of electrochemical anodic oxidation to anolylate benzylic C(sp) groups. 3 The amide attacks the carbocation to form an imine intermediate, which is then hydrolyzed to break the C–N bond, thus achieving the synthesis of benzyl esters. This invention avoids the use of transition metals, high temperatures, high pressures, and stoichiometric amounts of hazardous oxidizing and reducing agents, and establishes good functional group tolerance, expanding the range of substrates and providing a supplementary approach for the synthesis of benzyl esters under mild conditions.

The application relates to the technical field of zinc ion batteries, and discloses a composite negative electrode for a water-based zinc ion battery and a preparation method and application thereof, the method is simple in process, low in cost and easy to mass produce, and specifically comprises the following steps: in-situ growth of copper hydroxide nanorod arrays on the surface of a copper foil current collector through electrochemical anodic oxidation, dehydration conversion into copper oxide nanowires through air atmosphere annealing, and then electrodepositing a zinc layer to obtain the target composite negative electrode. The copper oxide nanowires are distributed in a three-dimensional staggered mode, have a large specific surface area and abundant zinc-philic sites, can induce uniform deposition of zinc ions, and do not need to add traditional adhesives, thus avoiding problems such as interface impedance rise, poor electronic conduction and active material falling caused by the adhesives. When the composite negative electrode is applied to a water-based zinc ion battery, zinc dendrite growth can be significantly inhibited, side reactions can be relieved, and the cycle stability and service life of the battery can be improved.

Corrosion-inhibiting coating for metallic substrates comprising a brittle aluminum alloy and a binder. Composition of a corrosion-inhibiting coating for a metallic substrate, the coating composition comprising a film-forming binder and powdered aluminum alloy particles. The aluminum alloy comprises silicon in an amount of 1% to 30% by weight, as well as one or more elements, selected from a first group, which includes an element enhancing embrittlement and / or an element enhancing electrochemical anodizing.

Embodiments of the present invention provide a method for removing a barrier layer of a metal interconnection on a wafer, which remove a single-layer metal ruthenium barrier layer. A method comprises: oxidizing step, is to oxidize the single-layer metal ruthenium barrier layer into a ruthenium oxide layer by electrochemical anodic oxidation process; oxide layer etching step, is to etch the ruthenium oxide layer with etching liquid to remove the ruthenium oxide layer. The present invention also provides a method for removing a barrier layer of a metal interconnection on a wafer, using in a structure of a process node of 10 nm and below, wherein the structure comprises a substrate, a dielectric layer, a barrier layer and a metal layer, the dielectric layer is deposited on the substrate and recessed areas are formed on the dielectric layer, the barrier layer is deposited on the dielectric layer, the metal layer is deposited on the barrier layer, wherein the metal layer is a copper layer, the barrier layer is a single-layer metal ruthenium layer, and the method comprises: thinning step, is to thin the metal layer; removing step, is to remove the metal layer; oxidizing step, is to oxidize the barrier layer, and the oxidizing step uses an electrochemical anodic oxidation process; oxide layer etching step, is to etch the oxidized barrier layer.

The present invention relates to a method for preparing a flexible oxide memristor array using electrochemical anodization technology, which belongs to the intersection of flexible semiconductor devices and electrochemistry. A plurality of mutually independent inert bottom electrodes are deposited on a flexible substrate using a mask; active metal layers are deposited on the obtained inert bottom electrodes using a mask; connecting rods are added to each inert bottom electrode to connect all the inert bottom electrodes into a whole to ensure uniformity and integrity during current conduction; the connecting rods are connected to the positive pole of the power supply, and all the active metal layers are completely immersed in an electrolyte for anodization, so that the active metal layers are oxidized into an oxide intermediate layer; a top electrode is deposited on the oxide intermediate layer, and then the connecting rods are removed to obtain a flexible oxide memristor array. The present invention adopts a fast and convenient process to prepare a flexible memristor array, which improves the efficiency and uniformity of preparing the memristor array by anodization.

The present invention discloses a titanium dioxide-molybdenum disulfide ultrasonically triggered antibacterial coating and its preparation method and application. The preparation method comprises the following steps: using a titanium sheet as a working electrode, forming an electrochemical anodizing system with a working electrode, a counter electrode and an electrolyte, electrochemically anodizing for 5 to 60 minutes at 10 to 50V to obtain a titanium sheet loaded with titanium dioxide nanotubes, and keeping the titanium sheet loaded with titanium dioxide nanotubes at 400 to 500°C for 0.5 to 1 hour under a nitrogen or inert gas atmosphere, cooling to room temperature to obtain a first substance; using molybdenum disulfide as a target material, magnetron sputtering the first substance for 0.5 to 4 minutes under an inert gas atmosphere to obtain a titanium dioxide-molybdenum disulfide ultrasonically triggered antibacterial coating on the titanium sheet. The titanium dioxide-molybdenum disulfide ultrasonically triggered antibacterial coating of the present invention can generate heat and active oxygen under the triggering of ultrasonic waves. Through the combined action of active oxygen and heat, bacterial growth can be inhibited and bacterial death can be caused, thereby improving the antibacterial effect.

This invention is related to the fabrication method of Cu2O / TiO2 nanotube arrays (Cu2O / TNA) composite based on green synthesis using kepok banana peel extract (Musa paradisiaca L.) as a source of polyphenol compounds that act as reducing agents, stabilizers, and crystal growth controllers. This method begins with the formation of TNA through an electrochemical anodization process on a titanium substrate in an ethylene glycol-based electrolyte containing NH4F, followed by a calcination process to obtain anatase TiO2 structure. Furthermore, a Cu2O layer is deposited on the TNA surface through the electrodeposition method using Cu(CH3COO)2·H2O solution added with kepok banana peel extract with varying polyphenol concentrations of 0, 2, and 3 g Lâ€'1. The characterization results show that the formed Cuâ‚‚O / TNA composite has anatase TiO2 and cubic Cu2O phases without CuO or metallic Cu impurity phases.Variations in polyphenol concentration significantly affect the crystallite size, morphology, and optical properties of the material, where increasing polyphenol concentration results in smaller crystallite size, more uniform truncated octahedral Cu2O morphology, and a decrease in band gap energy from 2.68 to 2.66 eV which increases the visible light absorption capacity. The resulting composite has the potential to be applied as a photoelectrochemical material.

The invention provides a low platinum-nickel iron nitrogen composite self-supporting electrode, which is prepared by the following method: taking a platinum sheet as an anode, taking a nickel sheet as a cathode, taking a distance between the anode and the cathode as 2-3 cm, taking a hydrochloric acid aqueous solution containing ferric trichloride and melamine as an electrolyte, and reacting at the constant voltage of 10-30 V and the temperature of 40-60 DEG C for 1-2 hours to obtain the low platinum-nickel iron nitrogen composite self-supporting electrode. And carrying out electrochemical anodic oxidation and cathode electrodeposition coupling reaction for 1-5 hours, and carrying out cathode deposition to obtain the low platinum-nickel iron nitrogen composite self-supporting electrode. According to the method, nickel, iron and nitrogen elements are compounded while the deposition amount of low platinum is controlled, so that the dual functionality of the self-supporting catalyst is increased, the problem of agglomeration or falling of the catalyst is avoided, the catalytic activity is enhanced, and the method has a wide application prospect in the aspect of industrial application.

The invention provides a back contact cell, a preparation method thereof and a photovoltaic module, and relates to the technical field of solar cells, and the preparation method of the back contact cell comprises the following steps: carrying out electrochemical anodic oxidation treatment on a silicon substrate after laser film opening, and then preparing a metal electrode to obtain the back contact cell. According to the invention, an electrochemical anodic oxidation process is adopted to preferentially act on a high-activity damaged region caused by laser, the influence on a complete crystalline silicon region is extremely small, meanwhile, the defect density causing carrier recombination is reduced, the minority carrier lifetime in the cell is prolonged, an ideal and low-damage contact interface is provided for subsequent selective electroplating, and the performance of the cell is improved. And the filling factor of the BC battery can be improved.

The invention discloses a micro-nano gradient porous Ti-Ta-Cu material as well as a preparation method and application thereof. The method comprises the following steps: 1, preparing a Ti-Ta-Cu alloy with uniformly distributed components through electric arc melting; and secondly, a sample is pretreated, then electrochemical gradient dealloying is conducted in an electrolyte containing HF and HNO3, and the micro-nano porous Ti-Ta-Cu material is obtained. According to the method, the Ti-Ta-Cu material with the micro-nano porous surface is prepared through an electrochemical dealloying and oxidation synchronization strategy, and the surface micro-nano porous composite structure is formed through electrochemical anodic oxidation and dealloying process treatment. The structure is formed by interweaving nano-scale pores and micron-scale pores, and the surface layer is covered with a CuO / Ta2O5 composite oxide layer. According to the method, the corrosion resistance of the material is remarkably improved, the surface biological activity of the material is improved, meanwhile, high biocompatibility is reserved, and the method is suitable for severe environments such as ocean engineering and biomedical implants.

The invention provides a platinum-nickel-based oxide-tungsten carbide composite self-supporting electrode, which is characterized in that a tungsten sheet and a platinum sheet which are connected in parallel are used as an anode, a nickel sheet is used as a cathode, the distance between the anode and the cathode is 2-3cm, a hydrochloric acid aqueous solution is used as an electrolyte, electrochemical anodic oxidation and cathode electrodeposition coupling reaction is carried out for 3-5 hours under the conditions that the constant voltage is 15-25V and the temperature is 40-60 DEG C, and the platinum-nickel-based oxide-tungsten carbide composite self-supporting electrode is obtained. A precursor of the platinum-nickel-based oxide-tungsten carbide composite self-supporting electrode is obtained through cathode deposition, the precursor is placed in a mixed gas atmosphere of hydrogen and methane, a high-temperature reduction carbonization reaction is carried out for 0.5-5 h at the temperature of 500-800 DEG C, and the platinum-nickel-based oxide-tungsten carbide composite self-supporting electrode is obtained; the preparation process is simple, the operation is safe, the platinum loading capacity is low, the economic benefit is high, and the structure, composition and particle size of the catalyst can be easily regulated and controlled by controlling electrochemical reaction conditions and furnace burning conditions, so that the electrocatalytic activity and stability of the composite self-supporting electrode are improved, and the composite self-supporting electrode has a wide industrial application prospect.

The invention provides a dendritic nanopore structure on the surface of an aluminum material, a preparation method of the dendritic nanopore structure and application of the dendritic nanopore structure in an aluminum-clad steel ground wire, and the preparation method provided by the invention comprises the following steps: carrying out electrochemical anodic oxidation in an electrolyte by taking the aluminum material to be treated as an anode strip to form a nanopore structure on the surface of the aluminum material; the voltage of electrochemical anodic oxidation is stepping voltage. According to the method, the aluminum material is used as an anode, the stepping voltage is adopted for electrochemical anodic oxidation, the multi-stage aluminum dioxide nano-pores with the pore diameters gradually increased from the surface to the inner core are formed in the surface of the aluminum material, the nano-pores communicate with one another, the structure can be regarded as a dendritic nano-porous structure, the binding force between the structure and the surface of the aluminum material is good, and the stability is high; the porous structure has the characteristics of high porosity, uniform distribution, good coherence of the transition layer, no defect and the like, the specific surface area of the porous structure is greatly increased, and the application is facilitated. In addition, the method provided by the invention is simple in preparation process and relatively low in cost.

The invention discloses a lauryl sodium sulfate modified platinum-nickel hydroxide composite electrode and an electrochemical preparation method and application thereof. The method comprises the following steps: by taking a platinum sheet as an anode and a nickel sheet as a cathode, carrying out electrochemical anodic oxidation coupled cathode electrodeposition reaction in an electrolyte containing hydrochloric acid and lauryl sodium sulfate to obtain the lauryl sodium sulfate modified platinum-nickel hydroxide composite electrode which is uniform in size and regular in structure and is recorded as Pt / Ni (OH) 2-SDS; the electrode has the dual-function activity of electrochemical hydrogen evolution and amine micromolecule electrocatalytic oxidation, and the loading capacity of platinum is 10-100 [mu] g / cm < 2 >; the composition and the microstructure of the catalyst are regulated and controlled by controlling the reaction voltage, the reaction temperature, the electrolyte composition and the reaction time; the method is simple in preparation process, simple and convenient to operate, low in reaction equipment requirement, low in price, high in efficiency and easy to industrialize.

Multi-part rail wheel with a wheel rim (8), with a wheel body (9) made of a light metal material, which has a hub opening (14) in which a contact surface (20, 21) is provided, on which in use an outer ring (17, 18) of a rolling bearing (15, 16) is supported or which in use is connected to the outer surface of a shaft or a shaft stub, and with at least one elastic body (10) arranged between the wheel rim (8) and the wheel body (9), via which the wheel rim (8) is elastically supported on the wheel body (9), characterized in that at least the contact surface (20, 21) in the hub opening (14) of the wheel body (9) is covered with an oxide layer (OX) produced by electrochemical anodizing.

This invention relates to an anion ionomer-modified silver-based electrode, its preparation method, and its application. The preparation method includes the following steps: (1) using a titanium substrate as the working electrode, a titanium dioxide nanotube array electrode is obtained by electrochemical anodic oxidation, denoted as a TNT electrode substrate; (2) using the TNT electrode substrate obtained in step (1) as the working electrode, silver is deposited by electrodeposition to obtain a TNT composite electrode with deposited Ag, denoted as an Ag / TNT electrode; (3) an anion ionomer solution is sprayed onto the surface of the Ag / TNT electrode obtained in step (2) to complete the preparation of the anion ionomer-modified silver-based electrode. The electrode provided by this invention has excellent CO2 electroreduction performance and high selectivity for CO, enabling the control of the syngas ratio over a wide range, thereby meeting the needs of syngas preparation.

The invention discloses a synthesis method of a [1, 2, 4]-triazolone fused purine nucleoside compound, and belongs to the field of organic chemistry. The [1, 2, 4]-triazolone purine nucleoside compound is obtained by taking a 6-hydrazino purine derivative as a raw material and reacting in an undivided electrolytic tank in the presence of a catalyst and an organic solvent. According to the triazolone fused N-heteroaromatic compound and the preparation method of the triazolone fused N-heteroaromatic compound, electrochemical anodic oxidation is combined with aminooxy catalysis, and the conversion can convert a hydrazino heterocycle into various triazolone fused N-heteroaromatic compounds through tandem NH-NH oxidative dehydrogenation, intramolecular cyclization and 1, 2-carbon migration reaction, so that a huge potential is provided for developing a new tricyclic purine core lead compound.

The present invention discloses a method for preparing low-voltage chemically formed foil for solid-state aluminum electrolytic capacitors. The preparation method comprises first immersing the low-voltage chemically formed foil in a liquid containing a hydroxylamine organic compound, then treating it under inert gas protection to increase its electrostatic capacitance by 2% to 8% compared to before treatment; then employing a three-stage electrochemical anodization process, with each stage of the anodization process employing a lower current density. The low-voltage chemically formed foil prepared by the improved process has higher electrostatic capacitance, more stable performance, and longer lifespan. Solid-state aluminum electrolytic capacitors prepared using the low-voltage chemically formed foil have improved electrostatic capacitance and lifespan (especially high-temperature lifespan), better meeting the requirements of solid-state aluminum electrolytic capacitors.