359results about "Electrolytic coatings" patented technology

The invention discloses a terminal and a terminal manufacturing method. The terminal comprises a terminal body which is provided with a matching part used for being matched with a matching terminal. A first bottom plating layer and a first silver graphite plating layer formed on the first bottom plating layer are formed on the contact surface of the matching part of the terminal body. Graphite particles are uniformly dispersed in the first silver graphite plating layer, so that the wear resistance and the conductivity of the matching part of the terminal body are improved. According to the invention, the silver graphite plating layer has excellent wear resistance and conductivity, can greatly improve the matching times of the terminal and the matching terminal, and can reduce the plugging resistance between the terminal and the matching terminal.

The invention discloses an electroplated part, an electroplated part manufacturing method and a connector. The electroplated part comprises a base material; a nickel plating layer formed on the surface of the base material; the tin-graphite composite plating layer is formed on the nickel plating layer; the nickel plating layer is formed on the base material, the tin-graphite composite plating layer is formed on the nickel plating layer, the tin plating layer is formed on the tin-graphite composite plating layer, the nickel plating layer serves as a bottom plating layer of the base material, the tin plating layer serves as an outer plating layer of the base material, and the tin-graphite composite plating layer serves as a middle plating layer of the base material. According to the invention, the graphite particles exposed from the tin-graphite composite coating are partially or completely wrapped by the outermost tin coating, so that the graphite particles are not easy to fall off, the wear resistance and corrosion resistance of the electroplated part are improved, and the service life of the electroplated part is prolonged. In addition, the plating layer structure also has a relatively low friction coefficient, so that the insertion and extraction force of the electroplated part in the use process can be greatly reduced.

The present invention relates to a method of preparing a composite material, in particular one useful as a catalyst in an electrolytic hydrogen evolution reaction and / or the oxygen evolution reaction and / or urea oxidation-assisted water electrolysis. Provided is a method of preparing a composite material, the method comprising the steps of: (i) electrochemically depositing material onto a substrate from a deposition solution comprising a nickel (II) salt and graphene oxide, to obtain a nickel-reduced graphene oxide composite material comprising nickel dispersed on reduced graphene oxide, said composite material being deposited on the substrate; (ii) after step (i), placing the substrate, having the nickel-reduced graphene oxide composite deposited thereon, in an alkaline solution along with a counter electrode; and (iii) after step (ii), partially electrochemically oxidising the nickel, to obtain a partially oxidised nickel-reduced graphene oxide composite material comprising partially oxidised nickel dispersed on reduced graphene oxide, said composite material being deposited on the substrate. The composite of the invention demonstrates high catalytic activity for electrolytic hydrogen production under alkaline water electrolysis conditions (for example, a hydrogen evolution current of up to 500 mA cm-2 at -1.35 V against a Reversible Hydrogen Electrode). High activity is demonstrated even when the substrate (on which the composite is deposited) does not contain any, or at most trace amounts, of nickel. Thus, the electrode of the invention (that is, the combination of composite material and substrate) demonstrates higher catalytic activity per unit mass of nickel compared to previous electrodes based on nickel foam. The invention also provides a composite material, an electrode, a method of electrolytic hydrogen and / or production under alkaline electrolysis conditions, and a method of electrolytic urea oxidation under urea oxidation-assisted water electrolysis conditions, thereof.

The invention provides a pulse-direct current electrochemistry composite deposition process of a nickel-tungsten-phosphorus alloy coating, and belongs to the technical field of coating preparation, and the pulse-direct current electrochemistry composite deposition process comprises the following steps: carrying out silane coupling agent modification treatment on alpha-aluminum oxide; carrying out modification treatment on the hexagonal boron nitride nanosheet by adopting hexadecyl trimethyl ammonium bromide; carrying out polyacrylic acid modification treatment on the nano silicon dioxide; nickel salt, tungsten salt, phosphorus salt, a complexing agent, a buffering agent, a primary brightener, a secondary brightener, a wetting agent, modified aluminum oxide, modified boron nitride, modified silicon dioxide and deionized water are mixed, stirred and heated, and a composite plating solution is obtained; the substrate serves as a cathode, pulse current is applied to the substrate for pulse electroplating, then the current density of the pulse current is continuously and linearly reduced to a target value, and finally direct current electroplating is conducted under the target value; by optimizing the formula of the composite plating solution and the pulse-direct current composite electroplating process, the nickel-tungsten-phosphorus alloy composite plating layer with high hardness, low friction, high wear resistance and corrosion resistance is finally obtained.

The invention relates to the technical field of new energy material and electrochemical device manufacturing, and discloses a graphene-based functional nano-composite electrode preparation system based on AI parameter optimization, which integrates physical modules such as intelligent material supply, synthesis modification, slurry forming, post-treatment and the like with online characterization equipment into a whole. And closed-loop control is realized through the central AI optimization unit. And the central AI unit establishes a prediction model of process parameters and electrode performance by utilizing a deep neural network, reversely optimizes the process parameters according to performance requirements by adopting a multi-target optimization algorithm, and drives a system to iteratively execute a'preparation-test-optimization 'cycle until a high-performance electrode meeting a target is obtained. According to the method, automatic, accurate and efficient reverse design from performance requirements to process parameters is achieved, the problems that a traditional preparation method depends on experience and is low in efficiency and poor in repeatability are solved, and the research and development efficiency and the product performance limit of the electrode material are remarkably improved.

The invention belongs to the technical field of metal material plating, and particularly relates to a connector surface composite coating and a preparation process thereof, and the preparation process comprises the following steps: adding modified carbon black and sodium molybdate into deionized water, stirring to obtain a corrosion inhibition material, and mixing with modified zinc oxide to obtain a mixed filler; the preparation method comprises the following steps: adding dibutyltin dilaurate and toluene diisocynate into polypropylene glycol to obtain a core material; adding hexadecyl trimethyl ammonium bromide and the mixed filler into a 93-96 wt% ethanol solution, adding the core material for emulsification, adding an isophorone diisocyanate solution, and stirring to obtain a microcapsule; nickel sulfate hexahydrate, nickel chloride hexahydrate, sodium citrate, boric acid, a surface dispersant, a sodium hydroxide solution and microcapsules are added into deionized water to be mixed, and an electroplating solution is obtained; and putting the connector into the electroplating solution for electroplating to obtain the composite coating. The expansion of pitting corrosion can be inhibited, and the long-term use reliability and stability of the connector in a marine environment are improved.

The invention relates to a forming method for composite electroplating of an MEMS (Micro Electro Mechanical System) probe. Structural patterns of a needle tip or / and a needle body are / is photoetched through a micro-electro-mechanical process, the needle tip or / and the needle body is / are formed through electroplating of a composite plating solution after pretreatment, the composite plating solution is obtained by mixing a metal base solution and a turbid liquid, the metal base solution is a nickel base solution and / or a rhodium base solution, and the turbid liquid is a nickel base solution and / or a rhodium base solution. The suspension is formed by suspending nano-powder in water through a dispersing agent. Compared with the prior art, the technology provided by the invention has the following advantages that the MEMS process technology is combined with the composite plating solution to be used for various probe structures, and the performance of the prepared material is greatly improved compared with that of a pure metal coating; the composite plating solution prepared from the plating solution and the second-phase particles is high in stability, and the electroplating process is easy to operate; the nickel-based composite plating solution can be used for obtaining a main body material with higher hardness, better wear resistance and better flexural property; the rhodium-based composite plating solution is used for preparing a needle point material, has higher hardness and wear resistance, and improves the brittle fracture problem.

The utility model belongs to the technical field of diamond fretsaw machining, and particularly relates to electroplating equipment for diamond fretsaw machining, which comprises a bottom plate, a cleaning box, an electroplating device, an electroplating device and an electroplating device. The electroplating box is fixedly mounted at the top of the bottom plate, inlets and outlets are formed in the inner walls of the tops of the cleaning box and the electroplating box, and liquid outlets fixedly communicate with the rear sides of the cleaning box and the electroplating box; the number of the stand columns is two, and the bottom ends of the two stand columns are fixedly installed on the top of the bottom plate; the left end and the right end of the electric sliding rail are fixedly installed between the two stand columns respectively, switching between cleaning and electroplating of the diamond wire is achieved through a simple structure, manual operation transposition of personnel is not needed, meanwhile, drying operation after cleaning and electroplating of the diamond wire can be achieved, the drying efficiency is improved, and the working efficiency is improved. The machining process is high in automation degree, time-saving and labor-saving, and the electroplating efficiency and effect are greatly improved.

A blade (20) has an airfoil (22) having a tip (26). The blade (20) has a metallic substrate (80) and a coating system atop the substrate (80) at the tip (26). The coating system has: a first layer (110) of at least 99.0% weight nickel; an abrasive layer (114) having a matrix (118) and an abrasive (116) at least partially embedded in the matrix (118); and a second layer (112) between the first layer (110) and the matrix (118). The second layer (112) is tougher or more ductile than at least one of the first layer (110) and the matrix (118).

The invention belongs to the technical field of microbial protection and functional metal coating preparation, and particularly relates to a preparation method of a metal-based graphene oxide and zirconium oxide composite antibacterial coating on a flexible metal foil through magnetic field assisted jet electrodeposition. According to the method, a metal ion electroplating solution containing graphene oxide and zirconium oxide serves as a raw material on a flexible metal substrate, ferromagnetic particles are introduced to serve as a carrier, one-time forming is carried out under the action of a magnetic field through the scanning jet electrodeposition technology, and efficient fixing and uniform distribution of graphene oxide and zirconium oxide in a metal coating are achieved. The prepared coating is compact in structure and high in binding force, after the coating is in contact culture with escherichia coli and staphylococcus aureus for half an hour, the antibacterial rate reaches 94% or above, the antibacterial rate reaches 97% or above, and the coating has excellent stability and reliability. The method disclosed by the invention is simple and convenient in process and high in adaptability, can form a high-performance antibacterial coating on a flexible substrate, is suitable for the antifouling and anticorrosion fields of public health facilities, marine protection and engineering equipment, and has a wide industrial application prospect.

The application discloses a surface strengthening method suitable for low-temperature steel friction pairs of polar ship with complex configuration, and aims at solving the problems of insufficient surface wear resistance of the friction pairs and difficulty in surface strengthening in the existing polar ship with complex configuration.The surface strengthening method of the low-temperature steel friction pairs comprises the following steps: firstly, polishing and ultrasonic cleaning are conducted on the low-temperature steel friction pair materials; secondly, nano-diamond particle powder and spherical hard ceramic particles are mixed by ball milling; thirdly, a nickel-based plating solution is prepared; fourthly, supersonic particle bombardment treatment is conducted on the surface of the clean friction pair materials; fifthly, a nickel-based plating layer is prepared by adopting a chemical plating or brush plating process; sixthly, the step four and the step five are repeated for multiple times; seventhly, a composite plating solution is prepared; and eighthly, a self-lubricating coating is prepared.The application prepares a multilayer composite structure coating comprising a hardening layer, an alloy layer and a self-lubricating layer, the coating has good combination performance, high hardness and wear resistance, and is suitable for the low-temperature steel friction pairs of the polar ship with complex configuration.

The invention relates to the field of corrosion-resistant fasteners, in particular to a corrosion-resistant fastener and a preparation method thereof. The anti-corrosion fastener comprises a fastener body and an anti-corrosion layer, wherein the surface of the fastener body is sequentially coated with the anti-corrosion layer from inside to outside, and the anti-corrosion layer is a zinc-nickel alloy doped nanometer silicon carbide particle coating layer. The anti-corrosion layer is formed by doping zinc-nickel alloy with nano silicon carbide particles. As the zinc-nickel alloy is used as an electrochemical active material, through a cathode protection mechanism of a sacrificial anode, an oxidation reaction is carried out prior to a matrix metal, so that matrix corrosion is inhibited. Nano silicon carbide particles are introduced, the grain boundary defect of an alloy layer is filled through the physical dispersion strengthening effect, the porosity of the coating is reduced, and a compact physical barrier is formed to block corrosion medium permeation. Active protection of cathode protection and passive protection of physical barrier are combined to a single anticorrosive coating, and the function limitation of a traditional single coating is broken through.

Provided is a roughened copper foil capable of achieving both high adhesiveness with respect to a thermoplastic resin and exceptional high-frequency characteristics. The roughened copper foil has a roughened surface on at least one side thereof. In the roughened surface, the surface texture aspect ratio Str is 0.02-0.24, and the load area ratio Smr1 separating protruding peaks from a core portion is 1.0-15.0%. Str and Smr1 are values measured in compliance with ISO 25178 at a cutoff wavelength of 0.251 μm using an S-filter and at a cutoff wavelength of 4.5 μm using an L-filter.

The present invention relates to a metallic bipolar plate comprising a metal substrate and at least one layer of non-hydrogenated transition metal-doped diamond-like carbon (DLC) disposed on the metal substrate. The non-hydrogenated DLC comprises at least one transition metal selected from groups 4d, 5d, and 6d of the periodic table of elements, with a portion of the at least one transition metal present in the non-hydrogenated DLC in the form of a carbide of the at least one transition metal as a matrix. The non-hydrogenated transition metal-doped DLC has an indentation hardness of 35 GPa or more, preferably 40 GPa or more. Metal-doped DLC used as a coating for metallic bipolar plates in fuel cells and electrolyzers exhibits a longer life (>10,000 hours) and high corrosion resistance and low interfacial contact resistance even under severe operating conditions. Therefore, the present invention also relates to such uses, and to fuel cells, particularly proton exchange membrane fuel cells, and electrolyzers comprising such coated metallic bipolar plates. The present invention further provides a cathodic arc discharge deposition method for depositing a coating of non-hydrogenated DLC, preferably non-hydrogenated transition metal doped DLC, comprising at least one of the transition metals listed above.

The invention provides an online temperature control coordinated regulation and control method and system for diamond fretsaw electroplating baths, and relates to the technical field of process control over the temperature of the electroplating baths, and the method comprises the steps that the temperature of each electroplating bath and the flow rate of a plating solution are collected through a sensor, and the heat conduction strength is calculated in combination with the distance between the baths; determining a risk slot position according to the heat conduction intensity, marking the priority, and expanding to obtain an interfered slot position; packaging interference risk data through an instant sharing protocol, and transmitting and acquiring feedback information through a high-speed communication bus; correcting abnormal data, marking risk attributes to generate a temperature fluctuation vector, extracting peak value characteristics to obtain a production line wave and trend, and generating a linkage adjustment instruction sequence; kalman filtering is adopted to optimize instructions and distribute the instructions, and response delay is monitored; and if the delay exceeds the threshold value, classifying abnormal modes through a support vector machine to obtain a defect prediction label, and iteratively adjusting the current density and the pH value of the plating solution. The process defects caused by temperature fluctuation and delay are effectively avoided, and the stability of the electroplating process is guaranteed.

The present application mainly relates to the technical field of metal surface treatment, and particularly relates to a tin plating solution containing a matte tin plating additive and a preparation method thereof, which comprises 180ml / L of methyl sulfonic acid, 70ml / L of methyl sulfonic stannous acid and the matte tin plating additive, the matte tin plating additive comprises components with mass-volume concentrations as follows: 30-100g / L of a dispersant, 100-300g / L of an organic solvent, 0-10g / L of a grain refiner, 50-100g / L of a complexing agent, 5-10g / L of an antioxidant and water. The preparation of the matte tin plating additive comprises the following steps: step 100, adding water and the organic solvent into a reaction kettle and stirring; step 200, sequentially adding the dispersant, the grain refiner, the complexing agent and the antioxidant, and stirring for 2-5 hours to obtain the matte tin plating additive. In the present application, the combination of the dispersant and the refiner increases the gloss of the plating layer and improves the bonding force between the plating layer and the grain, and between the grains.

The invention provides a marine self-repairing anti-corrosion coating, and belongs to the technical field of anti-corrosion coatings, and the anti-corrosion coating is a nano composite coating formed in situ through an electrochemical co-deposition method; the anticorrosive coating comprises a continuous phase formed by polyaniline as a matrix material, polydopamine uniformly dispersed in the matrix material as an interface reinforcement phase, and a layered molybdenum disulfide-based functional nano material also dispersed in the matrix material as a functional filler, the layered molybdenum disulfide-based functional nano material is a molybdenum disulfide nanosheet with a 1T / 2H heterojunction structure, and the surface of the nanosheet is loaded with nanoscale cerium oxide particles or a molecular benzotriazole corrosion inhibitor through chemical modification. According to the invention, the problems of environmental pollution and insufficient stability of the existing anticorrosive coating and environmental problems caused by excessive addition of iron in the conventional Fenton reaction are solved.

The design of the present invention belongs to the technical field of metal surface anti-corrosion coatings, and specifically discloses a method for preparing a hydrogen-barrier coating and an anti-corrosion hydrogen-barrier composite coating at room temperature. The method adopts a room-temperature electric-assisted method to prepare a black oxide hydrogen-barrier coating, and then an organic resin is coated on the hydrogen-barrier coating to construct a double-layer composite coating. This composite coating has excellent hydrogen barrier properties and adhesion, and has long-term corrosion resistance. It can solve the problem that traditional single organic resin coatings do not have hydrogen barrier function and cannot provide long-term corrosion protection in hydrogen-related environments.

To provide a composite material with excellent abrasion resistance and heat resistance, in which a composite coating including carbon particles in a silver layer is formed on a raw material.SOLUTION: A composite material comprises a composite coating composed of a silver layer including carbon particles, which is formed on a raw material. The content of Sb in the composite coating is 1 mass% or less. A crystallite size of silver of the composite coating is 40 nm or less.SELECTED DRAWING: None

To provide a novel catalyst layer (CL) composition and a structure that provide excellent durability and sustained catalyst performance for contemplated large vehicle applications.SOLUTION: A CL composition and a structure include: an internal composition composed of binder-coated nanoparticles, binder-free catalyst nanoparticles, and regular electrical, ionic, gas, and liquid pathways; a multilayer structure with different packing densities between multiple sub-layers; and an external pattern of an outer surface of the CL. An improvement in CL durability and catalyst performance is achieved, and by using the CL of the present invention, a novel solid electrolytic plating process is demonstrated and a novel thin film coating catalyst product is obtained. The binder-coated nanoparticles function as interconnecting substrates or sites to which nanoparticles that are not coated on their binder-coated surface are adhesively attached, and achieve a regular structure in which the binder-free catalyst nanoparticles are consistently interspersed between the binder-coated nanoparticles and their aggregates.SELECTED DRAWING: Figure 2

A biomimetic desert beetle self-transporting bone microgrinding head and a preparation process thereof, and relates to the field of medical instruments. The microgrinding head includes a hydrophobic matrix or a matrix having a hydrophobic plating layer. The matrix has a hydrophobic surface on which several hydrophilic abrasive particles are uniformly distributed. A process for preparing the microgrinding head is: selecting diamond abrasive particles and conducting oxidization treatment of the diamond abrasive particles; forming a hydrophobic matrix by scanning a surface of the matrix with a laser; or alternatively obtaining a hydrophobic plating layer by a chemical modification method; and combining the oxidized diamond abrasive particles with the hydrophobic matrix or the hydrophobic plating layer by electroplating to obtain a microgrinding head. The microgrinding head utilizes to achieve an effect of being capable of cooling rapidly and capturing cooling medium droplets and effectively transporting the droplets to a grinding arc region.

To provide a base metal plating bath useful for manufacturing a base metal plating film with high glossiness and oxidation resistance.SOLUTION: A base metal plating bath contains base metal ions and hydrophilic nano-diamond particles. The concentration of hydrophilic nano-diamond particles is 0.001 to 1 g / L.SELECTED DRAWING: None

This invention relates to the technical field of graphene composite material preparation, specifically to a method for preparing a graphene-nanotwinned copper composite material, which is prepared using a pulsed composite electrodeposition process, including the following steps: (1) preparing a copper sulfate electroplating solution containing a brightener, a leveling agent, and a dispersant, and uniformly dispersing graphene in the electroplating solution to form the final composite plating solution; (2) using an inert electrode as the cathode and a copper-phosphorus plate as the anode, placing the cathode and anode in the composite plating solution, and performing pulsed electrodeposition to obtain a composite material with a gradient structure of copper grains as the matrix and graphene as the reinforcing phase. The graphene / gradient nanotwinned copper composite material prepared by the method of this invention has the characteristics of good graphene dispersion, fine matrix twin layers, and excellent composite material hardness and thermal conductivity. This method is suitable for large-scale industrial applications.

The utility model provides a carborundum line sand plating device which comprises an electroplating bath, a group of electrode plates are fixedly arranged in the electroplating bath, and a limiting component is arranged in the electroplating bath; a stirring assembly; the stirring assembly comprises two groups of mutually symmetrical stirring structures, each stirring structure comprises two mutually symmetrical rotating rods I rotationally connected in the electroplating bath, one end of each rotating rod I rotationally penetrates through the electroplating bath, and one end of each rotating rod I is fixedly sleeved with a belt pulley; the outer walls of the two belt wheels are jointly and rotationally sleeved with a belt body, and spiral blades are fixedly installed at one ends of the two first rotating rods. According to the device, carborundum can be quickly and uniformly mixed with electroplating liquid when being added, so that the uniformity of sand plating is improved, and meanwhile, sand lines with different specifications can be limited, so that the sand lines do not deviate during electroplating, and a worker can take up the lines conveniently.

In a sliding member, a hard material is dispersed in a soft metal matrix to form a surface layer to improve its fatigue resistance. The sliding member has a substrate layer and a surface layer, wherein the surface layer has a metal matrix and a hard material dispersed in the matrix and which is harder than the matrix, the hard material having a slope in its hardness, the slope of which gradually decreases from the inside of the hard material to the surface.

The utility model relates to the technical field of electroplated diamond fretsaw processing, and discloses a wire rod protection device for electroplated diamond fretsaw equipment, which comprises a screw rod and a base body, the base body is sleeved on the screw rod and is in threaded connection with the screw rod, a branching comb is arranged on the upper surface of the base body, and the branching comb is arranged on the lower surface of the base body. The wire separating comb is provided with a plurality of separating grooves for wire bodies to penetrate through, and the separating grooves are arranged in the transverse direction. According to the scheme provided by the invention, doubling during production of the electroplated diamond fretsaw can be prevented.

To reduce the insertion / removal resistance between the terminal and the mating terminal. [Solution] The present invention discloses a terminal and a method for manufacturing a terminal. The terminal comprises a terminal body 10 having a mating portion 11 for mating with a mating terminal. A first bottom plating layer 11a is formed on the contact surface of the mating portion 11 of the terminal body 10, and a first silver-graphite plating layer 11c is formed on the first bottom plating layer 11a. Graphite particles are uniformly dispersed in the first silver-graphite plating layer 11c to improve the wear resistance and conductivity of the mating portion 11 of the terminal body 10. In the present invention, the silver-graphite plating layer has excellent wear resistance and conductivity, can significantly increase the number of mating cycles between the terminal and the mating terminal, and can reduce the insertion and removal resistance between the terminal and the mating terminal.

The invention discloses a traction wheel for manufacturing a diamond fretsaw and a manufacturing method, and relates to the technical field of electroplating, the traction wheel comprises a rack, a conveying mechanism, a traction wheel mechanism and a take-up mechanism, the rack is provided with the conveying mechanism, the traction wheel mechanism and the take-up mechanism; by arranging the conveying mechanism, wires can be automatically conveyed, base lines can be limited, and wire jumping is prevented; the conductive impeller and the traction wheel are designed in a split mode so that the conductive impeller can be replaced and overhauled conveniently, conductive liquid can be stirred through rotation of the conductive impeller, components in the conductive liquid can be effectively and evenly dispersed, and the precipitation and layering phenomena are prevented; the universal traction wheel mechanism is matched with the take-up mechanism, so that electroplated wires can be automatically wound.

The invention relates to the technical field of electro-deposition equipment, and provides a radioactive source auxiliary electro-deposition pressure stand and device.The pressure stand comprises a rack, a source table is arranged on the rack, and a supporting face used for supporting a radioactive source sheet is formed on the source table; the pressure mechanism is connected to the rack, and a pressing end facing the supporting surface is formed on the pressure mechanism; the pressure mechanism is slidably connected with the rack. The pressing end can get close to or get away from the supporting face along with sliding of the pressure mechanism. The pressure mechanism is connected with the driving mechanism through the transmission mechanism, and the transmission mechanism is used for converting driving of the driving mechanism into sliding of the pressure mechanism, so that the pressing end is close to or away from the supporting face. By means of the arrangement, a traditional connection mode of fastening through multiple screws is replaced, operation is easy and convenient, sealing reliability is high, operation efficiency can be further improved, in addition, the risk that workers make contact with electrolyte or an electro-deposition tank can be reduced, and safety is high.