64 results about "Sodium hypophosphite" patented technology

The invention relates to the field of metal surface treatment, and discloses an efficient electroplating process for a cotton picker spindle and an electroplating liquid formula, the efficient electroplating process comprises the following steps: step 1, substrate pretreatment: sequentially carrying out alkali washing, acid washing and plasma activation on the spindle; step 2, preparing an electroplating solution: dissolving nickel sulfate, sodium hypophosphite, a composite nano additive and a complexing agent in water, and adjusting the pH value to 4.8-5.3; step 3, gradient pulse electroplating: carrying out pulse electroplating in three stages, including bottom layer deposition, transition layer deposition and composite layer deposition; 4, post-treatment is conducted, specifically, silane sealing and curing are conducted on the plating layer; the base body pretreatment in the first step comprises the following sub-steps of alkali washing and oil removal, wherein the picking ingot is soaked in a NaOH solution with the concentration being 45-55 g / L. According to the method, high-density hydroxyl active sites are constructed on the surface of the metal base material through a plasma activation process, strong chemical bonding is formed between a plating layer and the base material, and the interface bonding strength is remarkably improved.

The invention provides a sea urchin-shaped FeP-coated NC composite material and a preparation method and application thereof, the composite material is formed by wrapping internal FeP nanoparticles with an external nitrogen-doped carbon layer, and presents a unique sea urchin-shaped structure; the preparation method comprises the following steps: preparing a FeOOH precursor by a hydrothermal method, adding the FeOOH precursor into a Tris buffer solution for ultrasonic dispersion, adding dopamine into the solution, stirring for a long time at normal temperature, separating, washing, and drying to obtain FeOOH (at) PDA; carrying out phosphating treatment on FeOOH-coated PDA and sodium hypophosphite at two ends of a porcelain boat according to a certain mass ratio in an atmosphere full of Ar to obtain a FeP-coated NC composite material; as a sodium ion battery negative electrode material, the composite material shows excellent electrochemical performance, and the specific capacity of 174.5 mAh g <-1 > can still be kept after 200 times of circulation under the current density of 2A g <-1 >, so that the material has the electrochemical performance with higher application potential.

The invention relates to the technical field of new energy chemical catalysis, in particular to a catalyst for preparing formaldehyde through photo-thermal catalysis of methane under gas-solid continuous flow as well as a preparation method and application of the catalyst. The preparation method comprises the following steps: S1, preparing a pretreatment carrier; s2, preparing a precursor solution: S201, adding a palladium chloride solution into the zinc oxide suspension, stirring at room temperature, carrying out vacuum suction filtration, washing and drying to obtain a Pd / ZnO precursor; s202, dispersing the Pd / ZnO precursor in deionized water, adding rare earth metal salt, dropwise adding triethylene tetramine, stirring, and adding sodium hypophosphite to obtain a precursor solution; s3, preparing a composite precursor; and S4, carrying out post-treatment. The invention provides a catalyst for preparing formaldehyde through photo-thermal catalysis of methane under gas-solid continuous flow as well as a preparation method and application of the catalyst, and aims at solving the problems that in related technologies, the activation difficulty of methane C-H bonds is high, formaldehyde is prone to deep oxidation, and the operation efficiency of the catalyst in a gas-solid continuous flow system is low.

The invention provides a MnOx modified NiCoP nanosheet array material and a preparation method of the MnOx modified NiCoP nanosheet array material. The invention provides a MnOx modified NiCoP nanosheet array material and a preparation method thereof, and the preparation method comprises the following steps: dissolving cobalt salt and 2-methylimidazole in deionized water, adding foamed nickel, and reacting at room temperature to obtain a Co-MOF precursor; then adding the precursor into a nickel source solution, and standing at room temperature to obtain NiCo-LDH; the preparation method comprises the following steps: placing anhydrous sodium hypophosphite and NiCo-LDH in an argon atmosphere together, and heating to obtain a NiCoP nanosheet array; and finally, the NiCoP nanosheet array is placed in a uniform solution containing a manganese source, and the MnOx modified NiCoP nanosheet array material is finally obtained through electro-deposition. The three-dimensional structure of the nanosheet array can fully expose active sites, and MnOx modification can improve the conductivity of the material and regulate and control the electronic structure, thereby improving the intrinsic activity of electrolyzed water. Practice shows that the material shows excellent overpotential and stability when being used as an electrolytic water electrode material.

The invention discloses an iron-doped nickel-cobalt metaphosphate electrode material based on an oxide intermediate and a preparation method and application thereof, and relates to the technical field of supercapacitors, the preparation method comprises the following steps: preparing an electrolyte containing a nickel salt, a cobalt salt and an iron salt, and carrying out electro-deposition on a conductive substrate to obtain the iron-doped nickel-cobalt metaphosphate electrode material. A nickel-cobalt-iron layered double hydroxide precursor is obtained; sintering the nickel-cobalt-iron layered double hydroxide precursor to prepare an intermediate; and phosphating the intermediate by taking sodium hypophosphite as a phosphorus source to finish the preparation. The invention also discloses the iron-doped nickel-cobalt metaphosphate electrode material based on the oxide intermediate prepared by the method and an application of the iron-doped nickel-cobalt metaphosphate electrode material in preparation of a supercapacitor. Through a unique pre-oxidation process and substrate optimization, the electrochemical performance of the electrode material is remarkably improved, and the problems that an existing metaphosphate material is poor in conductivity and insufficient in active site are solved.

The invention relates to the field of chemical plating, in particular to a high-phosphorus chemical nickel-phosphorus plating process and a super-corrosion-resistant and wear-resistant valve prepared through the high-phosphorus chemical nickel-phosphorus plating process. The process comprises the following steps that 1, a workpiece is polished, and the polished workpiece is obtained; 2, the polished workpiece is pretreated, and the pretreated workpiece is obtained; 3, a plating solution for high-phosphorus chemical nickel-phosphorus plating is prepared; 4, the pretreated workpiece is immersed in a high-phosphorus chemical nickel-phosphorus plating solution, and chemical plating is completed on the surface of the workpiece; and 5, sequentially carrying out post-treatment and heat treatment on the product obtained in the step 4 to obtain a finished product. Wherein a plating solution for high-phosphorus chemical nickel-phosphorus plating is a water-in-oil emulsion; the composition comprises a water phase and an oil phase; the water phase contains nickel salt, sodium hypophosphite and at least one organic acid; the oil phase comprises kerosene, isoparaffin or synthetic ester.

The invention discloses a preparation method and application of a composite electrode for removing chlorinated PPCPs in water through electro-catalytic hydrodechlorination, and the preparation method of an electrochemical cathode comprises the following steps: placing foamed nickel in a mixed solution of nickel nitrate hexahydrate and manganese sulfate for electro-deposition, and after the reaction is finished, drying the foamed nickel to obtain a NiMn-LDH / NF electrode, and placing the NiMn-LDH / NF electrode and anhydrous sodium hypophosphite in a tubular furnace, carrying out calcination phosphorization in a nitrogen atmosphere, placing the electrode in a mixed solution of palladium chloride and sodium chloride, and carrying out electro-deposition palladium loading to finally obtain the Pd / NiMn-LDH-Ov / NF composite electrode. The Pd / NiMn-LDH-Ov / NF composite electrode prepared by the method has good electro-catalytic performance, the removal rate of losartan potassium can reach 96.45%, meanwhile, the Pd / NiMn-LDH-Ov / NF composite electrode has excellent recycling performance, and secondary pollution is avoided.

This invention discloses a method for low-resistivity thin-film deposition, comprising the following steps: Step 1, the ceramic substrate is first pickled with 2% hydrochloric acid for 1-2 hours. After pickling, it undergoes initial treatment and activation to obtain an activated ceramic substrate; Step 2, preparation of the nickel plating solution: 7-12 g / L nickel sulfate, 15 g / L sodium tungstate, 31.5 g / L sodium hypophosphite, 35 g / L sodium citrate, 2 ml / L ammonia, and 5 g / L thiourea are stirred and mixed thoroughly to obtain the nickel plating solution. This invention enhances the contact effect between the activation solution and the substrate through the synergistic effect of the raw materials, thereby improving the performance of the product. Simultaneously, tungsten metal in the electroplating process possesses characteristics such as high temperature resistance, corrosion resistance, low temperature coefficient of resistance (TCR), and good thermal stability. Furthermore, the synergistic effect of the raw materials significantly improves the product's performance.

The application relates to a tungsten alloy material wire cutting technical field, in particular to a preparation method of a high-strength tungsten wire composite material for cutting. The preparation method of the high-strength tungsten wire composite material for cutting comprises the following steps: preparing a base tungsten wire, preparing surface plated diamond, preparing modified plated diamond and preparing the high-strength tungsten wire composite material. In the application, the diamond micro powder is pretreated and activated, then is added into a plating solution of nickel sulfate, sodium molybdate and sodium hypophosphite dihydrogen, and is chemically plated to prepare a Ni-Mo-P plating layer on the surface of the diamond, and after the surface plated diamond is obtained, when the diamond is embedded into the base tungsten wire, a mechanical interlocking structure can be formed between the diamond and the base tungsten wire to resist the shearing stress during cutting, therefore, the preparation of the Ni-Mo-P plating layer on the surface of the diamond can effectively improve the bonding force between the diamond and the base tungsten wire and reduce the falling amount of the diamond during cutting.

The invention discloses a process method for improving diffusion barrier performance and corrosion resistance of an amorphous Ni-P coating, and the process method comprises the following steps: step 1, pretreatment: grinding, polishing, cleaning and blow-drying a substrate to obtain a substrate to be plated; step 2, preparing a plating solution: dissolving nickel sulfate hexahydrate, nickel acetate tetrahydrate, trisodium citrate dehydrate, potassium sodium tartrate tetrahydrate, lauryl sodium sulfate, ammonium acetate and sodium hypophosphite into water, mixing to form a mixed solution, and adjusting the pH value of the mixed solution to 6-7 to obtain the plating solution; and 3, chemical plating is conducted, specifically, the to-be-plated substrate obtained in the step 1 serves as a cathode, a Ni sheet serves as an anode, the cathode and the anode are put into the plating solution obtained in the step 2, power-on activation is conducted, after plating is started, chemical plating is conducted spontaneously, and a chemical plating Ni-P plating layer is obtained. The plating layer prepared through the process method is smooth and compact in surface and free of air holes, has a mirror surface effect macroscopically, and has good corrosion resistance and diffusion barrier performance.

The invention relates to the technical field of copper powder preparation, and provides a preparation method of liquid-phase in-situ self-assembly nano-shell-coated micron-core composite copper powder, a specific inducer is introduced into a liquid-phase reduction system, copper sulfate is adopted as a copper salt, and sodium hypophosphite or VC is adopted as a reducing agent, so that one-time forming of a micron-core-nano-shell composite structure is realized; the problems of non-uniform particle size distribution, high energy consumption, low yield and the like in a traditional copper powder preparation method are effectively solved; according to the prepared composite copper powder, the low-temperature sintering driving force brought by the nanometer shell layer is obtained while the process-friendly characteristics of being easy to filter, easy to wash, easy to dry and the like of micron powder are reserved, the initial sintering temperature can be reduced to about 150 DEG C, and the machining performance of the copper powder under the low-temperature condition is remarkably improved.

The invention relates to the field of electrocatalyst catalytic energy conversion, and particularly discloses an oxygen-vacancy-enriched chromium ion doped nickel phosphate nanoflower as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, dissolving nickel nitrate hexahydrate, chromic nitrate nonahydrate, urea, sodium tartrate and polyethylene glycol into water, and then carrying out heating reaction; s2, mixing the chromium ion doped nickel hydroxide nanoflowers prepared in the step S1 with sodium hypophosphite, uniformly dispersing the mixture in water, and then performing freeze drying and sealed calcination; and S3, carrying out plasma reaction on the chromium ion doped nickel phosphate nanoflower prepared in the step S2 under the condition of introducing inert discharge gas to obtain the oxygen vacancy-enriched chromium ion doped nickel phosphate nanoflower. The oxygen-vacancy-rich chromium ion doped nickel phosphate nanoflower has relatively high conductivity and surface activity, and can reduce overpotential, promote the kinetic process of water decomposition reaction, reduce energy loss and improve the efficiency of hydrogen production by electrolysis of water.

The invention provides a method for improving the corrosion resistance of an amorphous Ni-Cu-P coating, which comprises the following steps: polishing, grinding, cleaning and drying a metal substrate to obtain a metal substrate to be coated; mixing nickel sulfate hexahydrate, nickel acetate tetrahydrate, copper sulfate pentahydrate, trisodium citrate dihydrate, potassium sodium tartrate tetrahydrate, lauryl sodium sulfate, ammonium acetate and sodium hypophosphite, and adjusting the pH value to obtain a plating solution; and the plating solution is put into a constant-temperature heater, a to-be-plated metal substrate serves as a cathode, a Ni sheet serves as an anode, the to-be-plated metal substrate and the Ni sheet are put into the plating solution, the voltage of a power source is adjusted, energization activation and chemical plating are conducted, and the metal substrate with the amorphous Ni-Cu-P plating layer is obtained. The amorphous Ni-Cu-P plating layer has an obvious passivation phenomenon in a 3.5% NaCl solution, and is excellent in corrosion resistance.

The application discloses a cobalt-phosphorus-cobalt oxide composite electrode material and application thereof as an anode of a direct borohydride fuel cell. First, a conductive substrate is placed in an aqueous solution containing a cobalt source, ammonium fluoride and urea to perform a hydrothermal reaction; after being reduced to room temperature, the conductive substrate is repeatedly cleaned with deionized water, and then is placed in a solution containing sodium hypophosphite to perform immersion; finally, the conductive substrate is calcined at high temperature in a vacuum environment to obtain the cobalt-phosphorus-cobalt oxide loaded on the conductive substrate in situ. The electrode material preparation method provided by the application converts the original contact between a carrier gas and an electrode surface in a phosphorization process into the in-situ adhesion of a phosphorus solution on the electrode surface, realizes a uniform phosphorization process, is low in cost and easy to be industrialized, and the material can be used as an anode material of the direct borohydride fuel cell.

The invention relates to the technical field of electronic equipment protection structures, in particular to a lightweight foamed aluminum-based integrated structural part for an electronic equipment case. The lightweight foamed aluminum-based integrated structural part comprises a gradient foamed aluminum matrix, a bionic ventilation channel and a surface conducting layer. The silicon dioxide coating layer in the modified foaming agent can isolate water vapor to reduce the moisture absorption rate, and the coating layer is gradually decomposed at high temperature, so that the initial decomposition temperature of titanium hydride is increased, the gas production time is prolonged, and pore collapse caused by concentrated gas production is avoided; interface bonding among the modified binder, the reinforced phase and the aluminum powder is converted into chemical bonding from physical adsorption, so that the bonding force of the interface is stronger, and local fracture caused by stress concentration is avoided; a polyvinyl alcohol coating layer of microencapsulated sodium borohydride in the modified reducing agent isolates direct contact with a plating solution, so that the hydrolysis rate is reduced, the effective effect is prolonged, and doped sodium hypophosphite fills lattice defects through rare earth ions, so that the fluctuation range of the reduction rate is reduced.

The application discloses a kind of vanadium doped nickel phosphide material of spherical micrometer flower structure and its preparation method and application, belong to electrolytic water hydrogen production material technical field.Method includes the following steps: (1) foam nickel is ultrasonically cleaned, dry;(2) deionized water, isopropanol, urea, NH4F, VCl3, Ni (NO3) 2·6H2O and the foam nickel treated in step (1) are placed in reaction vessel, heated reaction using hydrothermal method, obtain nickel vanadium oxide grown on foam nickel matrix;(3) nickel vanadium oxide obtained in step (2) and sodium hypophosphite are respectively loaded into porcelain boat, calcine in inert gas atmosphere, obtain vanadium doped nickel phosphide material of spherical micrometer flower structure.Afficient: the vanadium doped nickel phosphide material prepared in the application, according to electrochemical test results, vanadium doped nickel phosphide electrode of spherical micrometer flower structure shows excellent electrocatalytic performance, when current density is 10mA·cm ‑2 , overpotential is only 85mV;It has broad application prospect.

The invention relates to the technical field of high-performance copper material surface treatment, in particular to a stranding machine copper induction rod and a preparation method thereof.The stranding machine copper induction rod comprises a copper core body and a tin coating formed on the outer surface layer of the copper core body, and the tin coating is formed by electroplating of a methyl sulfonate tin plating solution. The tin plating solution comprises main salt, conductive acid and a composite additive composed of a stress relieving agent, a stabilizer and a surfactant. Wherein the stress relieving agent is a cobalt-nickel-molybdenum ternary metal composite additive, the stabilizer is a synergistic system of sodium hypophosphite and acrylamide, through a unique plating solution formula and process, a compact and uniform tin plating protective layer with high binding force and good toughness is formed on the surface of a copper bar, contact between a copper matrix and air is effectively isolated, and the corrosion resistance of the copper bar is improved. The problem of inductance detection function failure caused by copper oxidation is thoroughly solved, the service life and the detection reliability of the induction bar are remarkably improved, and the induction bar has industrial popularization and application value.

The present invention relates to a transesterification process comprising reacting an alkyl ester (a) of a carboxylic acid of formula 1a or 1b (R1-C (O) O-R2 (formula 1a) R2-O (O) C-R3-C (O) O-R2 (formula 1b) wherein R1 and R3 are saturated or unsaturated, branched or linear aliphatic or aromatic or alkoxylated residues, and R2 is selected from the group consisting of methyl, ethyl, propyl, isopropyl and n-butyl) with a monofunctional alcohol (b1) having formula 2 (R4-OH (formula 2) wherein R4 is a linear or branched, saturated or unsaturated alkyl group) or a monofunctional alcohol (b2) selected from the group consisting of glycerol, 1, 3-propanediol, 1, 2-propanediol, ethylene glycol, 1, 2-butanediol, 1, 4-butanediol, 2, 4-butanediol, 1, 3-propanediol, 1, 3-propanediol, 1, 4-butanediol, 1, 3-propanediol, 1, 3-propanediol, 1, 3-propanediol, 1, 3-propanediol, 1, 3-propanediol, 1, 3-propanediol, 1, 3-propanediol, 1, 3-propanediol, 1, 3-propanediol, 1, 3- A polyfunctional alcohol (b2) comprising 1, 3-butanediol is treated in the presence of catalysts lithium hydroxide and magnesium oxide (MgO) and optionally sodium hypophosphite. The use of specific catalyst compositions enables a more efficient energy saving process compared to standard prior art transesterification processes.

The invention discloses a non-magnetic chemical nickel plating solution and a deposition process, and relates to the technical field of metal surface plating treatment. A non-magnetic chemical nickel plating solution comprises water-soluble nickel salt, a reducing agent, a composite complexing agent, a stabilizing agent, a buffering agent, a brightening agent and the balance water, the water-soluble nickel salt is selected from at least one of nickel sulfate, nickel acetate and nickel aminosulfonate, and the reducing agent comprises sodium hypophosphite. The composite complexing agent comprises at least one of lactic acid, citric acid, glycine and aspartic acid. According to the technical scheme, iron, cobalt and other magnetic metal impurity ions are not directly introduced into the plating solution, nickel ions and phosphorus ions in the plating solution can be stably deposited, and the hardness and thickness uniformity of a plating layer can be improved while non-magnetic chemical nickel plating is achieved.

The invention discloses a bifunctional electrocatalyst and a preparation method and application thereof, and belongs to the technical field of electrocatalytic water decomposition, the preparation method comprises the following steps: adding pretreated foamed nickel into an aqueous solution containing a cerium source for hydrothermal reaction, and then sequentially cooling, washing and drying to obtain a NiCeOH precursor composite material; wherein the pH value of the mixed solution in the hydrothermal reaction process is 1-7; and carrying out heat treatment on the NiCeOH precursor composite material and sodium hypophosphite, and cooling to obtain the difunctional electrocatalyst. The release amount of the substrate nickel source is controlled by accurately adjusting the pH value of the solution, and a new technical thought is provided for catalyst synthesis. The characterization result shows that the catalyst has excellent charge transfer performance especially when the pH value is 2. Under the alkaline condition, the catalyst shows excellent bifunctional electrocatalytic activity and super-strong stability.

This invention relates to a bifunctional electrocatalytic self-supporting electrode based on filter paper and its preparation method, belonging to the field of electrocatalysis technology. The preparation method consists of the following steps: (1) weighing nickel sulfate and cobalt sulfate and dissolving them in deionized water; (2) dissolving sodium citrate and sodium hypophosphite in deionized water respectively, and then adding them sequentially to the solution obtained in step (1); (3) adjusting the pH of the solution obtained in step (2); (4) cutting the filter paper; (5) preparing a sodium hydroxide solution; (6) placing the cut filter paper in a water bath in the solution prepared in step (5); (7) weighing palladium chloride and sodium borohydride and dissolving them in deionized water at room temperature; (8) activating and then reducing the filter paper in step (6); (9) placing the filter paper obtained in step (8) in a water bath in the solution obtained in step (3) and drying it. This invention reduces overpotential, decreases relative energy consumption, increases catalytic activity, and improves catalyst stability.

This invention discloses a method for preparing a cobalt-based composite metal material and its application in electrocatalytic urea oxidation. The method involves a hydrothermal reaction of zinc acetate, cobalt acetate, hexadecyltrimethylammonium bromide, and 2-methylimidazole to obtain a ZnCo-ZIF precursor. The ZnCo-ZIF precursor is then dissolved in methanol with ferrous chloride and stirred for a certain period. After centrifugation, washing, and drying, FeZnCo-OH material is obtained. Finally, FeZnCo-OH material and sodium hypophosphite are placed separately in a tube furnace, nitrogen gas is introduced, and the reaction is heated. After cooling to room temperature, P-Fe2O3 / ZnCo2O4 material is obtained. Based on this, the cobalt-based composite metal material can be applied to electrocatalytic urea oxidation in 1.0 M KOH and 0.33 M urea solutions with a current density of 10 mA cm⁻¹. ‑2 The potential at which it is applied is 1.3353V, and it exhibits excellent catalytic activity for urea oxidation.

The invention relates to the field of metal surface treatment, and particularly discloses a non-magnetic chemical nickel plating solution and a deposition process. The non-magnetic chemical nickel plating solution comprises the following components: 20-30 g / L of nickel sulfate, 20-30 g / L of sodium hypophosphite, 10-20 g / L of a complexing agent, 0.5-2 ml / L of a brightening agent, 1-3 g / L of a stabilizing agent and the balance of water. The deposition process comprises the following steps: adding a plating solution into a plating tank, stirring, adjusting the pH value of the plating solution to 4.5-5.5, and heating the plating solution to 80-90 DEG C; a workpiece to be plated is put into the plating tank, the plating solution is stirred at the speed of 100-300 r / min, and the condition is kept for 1-3 h; and after plating is completed, the workpiece is taken out of the plating tank and cleaned, the cleaned workpiece is put into a heat treatment furnace to be subjected to heat treatment twice, and the workpiece subjected to heat treatment is passivated and dried. The non-magnetic chemical nickel plating solution and the deposition process have the advantages that a plating layer is uniform and non-magnetic.

The invention relates to the technical field of preparation of Ni-P coatings, in particular to a plating solution for preparing a Ni-P coating and a preparation method of the Ni-P coating. The invention provides a plating solution for preparing a Ni-P plating layer. The plating solution comprises 30-35 g / L of nickel sulfate, 25-30 g / L of sodium hypophosphite, 15 g / L of sodium acetate, 20 g / L of trisodium citrate, 10 g / L of lactic acid, 5 g / L of propionic acid, 2 g / L of dicarboxylic acid, 2 mg / L of thiourea, 0.1 g / L of an anionic surfactant, 20-80 mL / L of an additive and water. The additive comprises a rare earth metal salt solution, and the concentration of the rare earth metal salt solution is 120 g / L. According to the plating solution, a Ni-P plating layer can have excellent corrosion resistance, impact resistance and wear resistance at the same time.

The invention relates to the technical field of alloys, in particular to a magnesium alloy high-phosphorus chemical nickel plating process. The process sequentially comprises the steps of alkaline oil removal, first-stage activation, calcium ion bridging, zirconium ion curing and chemical nickel plating. Wherein the first-stage activating solution contains diammonium hydrogen phosphate, sodium fluoride and a directional hydrophobic HEDP (1-hydroxyethylidene-1, 1-diphosphonic acid) derivative; the chemical nickel plating solution contains nickel sulfate, lactic acid, succinic acid, sodium hypophosphite, sodium fluoride, thiourea and cerous nitrate. Through cooperation of multi-section interface treatment and plating solution components, magnesium alloy activation over-corrosion is effectively inhibited, the binding force and corrosion resistance of a high-phosphorus plating layer are remarkably improved, the technical problem that a plating layer in a chromium-free process is prone to blistering and stripping is solved, and the method is suitable for protection of high-reliability magnesium alloy parts.

Disclosed is a post-plating treatment method for a one-step brass-electroplated steel wire, comprising the following steps: electroplating the surface of the steel wire with a brass alloy; immediately washing the electroplated steel wire with cold water, removing residues from the surface of the steel wire, and blow-drying the steel wire with cold air; immersing the blow-dried steel wire in a water-based coating solution; and taking the immersed steel wire out, blow-drying the steel wire with natural air, and taking the steel wire up. The water-based coating solution comprises a polyoxyethylene organic salt, sodium hypophosphite and the balance of pure water, the polyoxyethylene organic salt comprising a salt of alkyl polyoxyethylene ether phosphate and polyoxyethylene alkylamine.

A method of preparing a metallic nickel / nickel-iron hydroxide catalytic layer-modified copper iodide-bismuth composite electrode is disclosed. The method comprises steps of: preparing a plating solution containing 0.25 M ammonium chloride, 0.067 M to 0.133 M nickel chloride, 0.067 M to 0.133 M ferrous sulfate, and 0.04 M to 2 M sodium hypophosphite; placing a copper iodide-bismuth composite electrode in the plating solution for electrodepositing metallic nickel / nickel-iron hydroxide catalytic layer onto the copper iodide-bismuth composite electrode to obtain the metallic nickel / nickel-iron hydroxide catalytic layer-modified copper iodide-bismuth composite electrode, CuI—Bi / Ni—NiFe(OH)x(r), wherein r is a molar ratio of nickel chloride to ferrous sulfate. A metallic nickel / nickel-iron hydroxide catalytic layer modified copper iodide-bismuth composite electrode and a method of preparing adiponitrile using the metallic nickel / nickel-iron hydroxide catalytic layer modified copper iodide-bismuth composite electrode are further disclosed.

The processing method of the diamond powder comprises the following steps: cleaning the diamond powder; carrying out surface sensitization treatment and activation treatment on the diamond powder; the diamond powder is subjected to chemical electroplating, and a nickel layer is plated on the surface of the diamond powder; wherein electroplating liquid in chemical electroplating comprises nickel sulfate, sodium hypophosphite, sodium tartrate, ammonium chloride and ammonium bifluoride. According to the method, damaged diamond powder can be repaired, burrs on the surface of the diamond powder are passivated, scratches are repaired, and therefore the use efficiency of the diamond powder is improved, and the service life of the diamond powder is prolonged.

The present invention discloses a nickel hydroxide microsphere coated and injected with Ni-P alloy, a preparation method and application thereof, and belongs to the technical field of energy storage batteries. By adopting an in-situ chemical reduction method with sodium hypophosphite as a reducing agent, the Ni-P alloy is not only coated on the outer surface of the nickel hydroxide secondary particles, but also injected into the interior of the nickel hydroxide primary particles, thereby improving the overall conductivity of the nickel hydroxide microspheres. The voltage efficiency of the alkaline zinc-nickel liquid flow battery assembled with the nickel hydroxide microsphere is significantly improved, and at the same time, the formation of γ-hydroxy nickel oxide is suppressed during the cycle process, and the nickel ball is prevented from fragmenting, and the battery has excellent battery performance and cycle stability. The preparation method of the nickel hydroxide microspheres of the present invention is simple and convenient, easy to scale up, and is expected to achieve large-scale commercial production.

The invention belongs to the technical field of hydrogen evolution electrodes, and discloses a hydrogen evolution electrode material with high catalytic activity and a preparation method and application thereof, and the preparation method comprises the following steps: step 1, cleaning foamed nickel; step 2, preparing a tungsten-iron-chromium co-doped hydroxyl cobalt fluoride / foamed nickel precursor WFeCrCo (OH) F / NF on the foamed nickel through a hydrothermal method; 3, the WFeCrCo (OH) F / NF obtained in the step 2 and sodium hypophosphite powder are placed at two different positions of a ceramic boat respectively, the sodium hypophosphite powder is located on the upstream side of a tubular furnace, heat preservation is conducted in a protective gas environment, then the temperature is naturally cooled to the room temperature, and the tungsten-iron-chromium co-doped cobalt phosphide composite electrode material WFeCr-CoP / NF is obtained. Through synergistic doping of three elements of tungsten, iron and chromium, the catalytic activity of the nickel-based hydrogen evolution electrode material is improved.