58 results about "Nickel sulfate hydrate" patented technology

The invention relates to a nickel-phosphorus chemical precipitation plating layer of an aluminium alloy, mainly containing the following components in content by weight: 20-30 grams/litre of hexahydrated nickel sulphate, 20-30 grams/litre of sodium hypophosphite, 15-20 grams/litre of sodium acetate, 6-10 grams/litre of butane diacid, 30-50 grams/litre of complexing agents, 20-60 PPM of stabilizingagent and 30-100 PPM of plating midbodies. The nickel-phosphorus chemical precipitation plating layer has the advantages of fast precipitation, well combining force of a plating layer, brightness andcompactness of the plating layer, excellent stable property of tank liquor, long service life, easy maintenance, and the like.

The invention discloses a nickel sulfate hexahydrate crystal and cobalt sulfate heptahydrate crystal continuous-crystallizing process which comprises the following steps: firstly carrying out MVR evaporation concentration on a high-purity solution produced through an extraction procedure to 30%-39%, and secondly continuously cooling and crystallizing through an improved cooling type internal-circulating continuous crystallizer; continuously discharging crystal slurry from the bottom of the crystallizer for centrifugal solid-liquid separation; and continuously drying a crystal product at low temperature to produce product crystals with large granularity and uniform size distribution, and recovering a mother solution to an evaporation process. Compared with the traditional periodic crystallization process, the nickel sulfate hexahydrate crystal and cobalt sulfate heptahydrate crystal continuous-crystallizing process disclosed by the invention has the advantages of low evaporation energy consumption, fewer crystallization control process parameters, stability in operation, high automation degree, high production efficiency and the like and is easy to control, and operators are reduced.

The invention relates to an efficient Ni/Ni(OH)2 hydrogen evolution electrode, which is characterized in that nickel sulfate hexahydrate and nickel chloride are adopted as sources of nickel elements,and nickel and hydroxide nanoparticles thereof are uniformly doped into a catalyst layer through a direct-current electrodeposition method in combination with subsequent oxidation-reduction treatment,so that the efficient Ni/Ni(OH)2 hydrogen evolution electrode is prepared. The invention also relates to a preparation method of the high-efficiency Ni/Ni(OH)2 hydrogen evolution electrode, which comprises the following steps: (1) pretreating the conductive substrate; (2) carrying out DC electrodeposition to prepare a catalyst layer formed by stacking nano flaky nickel and hydroxide thereof; and(3) carrying out anodic oxidation treatment to obtain the Ni/Ni(OH)2 hydrogen evolution electrode. The Ni/Ni(OH)2 hydrogen evolution electrode is scientific and reasonable in design and has the advantages of being high in catalytic hydrogen evolution activity, low in cost, low in energy consumption, stable in use, good in electrical conductivity and the like. The invention provides the Ni/Ni(OH)2hydrogen evolution electrode and the preparation method thereof with relatively high innovativeness.

The method of manufacturing nickel hypophosphite from a solution of hexahydrated nickel sulfate and a solution of monohydrated sodium hypophosphite by an electro-membrane technique, consists:a) in introducing respectively the hexahydrated nickel sulfate solution and the monohydrated sodium hypophosphite solution into each of two dilution circuits of four-compartment electrodialysis cells formed by alternating stacks of cationic and anionic homopolar membranes in an electrodialysis apparatus having an anode and a cathode that are insoluble;b) in applying an electrical current from the anode to the cathode without regulating the pH of the solutions contained in the dilution and concentration circuits but regulating the electricity supply, either in voltage or in current; andc) in recovering a hexahydrated nickel hypophosphite solution from one of the concentration circuits.

The invention discloses a visible light driven NiSe-based heterojunction photocatalyst for performing efficient photocatalysis on water to perform pyrolysis to produce hydrogen. The heterojunction photocatalyst is prepared by the following steps: preparing Cd0.5Zn0.5S sosoloid by taking cadmium acetate, zinc acetate and thioacetamide as cadmium, zinc and sulfur sources correspondingly and adoptinga precipitation-hydrothermal method; and taking nickel sulfate hexahydrate, sodium selenite and the synthesized Cd0.5Zn0.5S sosoloid as substrates, taking glycol as a solvent and a reducing agent, and synthesizing a NiSe/Cd0.5Zn0.5S heterojunction photocatalyst through a one-step solvent-thermal method. The maximum hydrogen production rate of the heterojunction photocatalyst under visible light reaches 70.3 mmol/h/g, and the activity of the heterojunction photocatalyst is 2.35 times that of pure Cd0.5Zn0.5S sosoloid; furthermore, the preparation method is green, environmentally-friendly, simple to operate and stable in activity, the utilization rate of sunlight, particularly visible light by the photocatalyst is greatly increased, and higher economic benefit can be achieved.

The invention relates to a microprism, in particular to a method for making a high-reflectance microprism reflecting film working mould with ultrasound-pulse electroforming. Electroforming liquid is prepared, namely hot water is added into an electroforming groove, then nickel sulfate hexahydrate and nickel chloride are added in sequence, hot water is added into a container, then boric acid is added, boiling is carried out, then lauryl sodium sulfate is added, after dissolution, liquid is poured into the electroforming groove, saccharin and 2-butyne-1,4-diol are added into the electroforming groove, then water is injected until the electroforming groove is full, pH is adjusted to 4.2; an anode nickel plate is placed into an anode basket and is connected to a positive electrode, a nickel master mould is connected to a negative electrode, ultrasound power is adjusted to 210-300W, frequency is adjusted to 30-50kHz, pulse current density is adjusted to 1-6A/dm<2>, current frequency is adjusted to 1000Hz, working time ratio of forward currents and backward currents is adjusted to 5:1, duty ratio is adjusted to 10%-30%, electroforming is carried out, and the high-reflectance microprism reflecting film working mould is obtained after cathode demoulding.

The invention discloses a preparing method of an environment-friendly type stainless steel welding wire not plated with copper and belongs to the technical field of welding wire machining. A degreasing solution is prepared by using sodium hydroxide, sodium carbonate, sodium phosphate dodecahydrate and sodium silicate as raw materials, a low-carbon steel wire is soaked in the degreasing solution for ultrasonic washing after being polished, and the low-carbon steel wire is connected with a power supply with a pure nickel bar, placed in an electroplating solution prepared by mixing nickel sulfate hexahydrate, nickel chloride, titanium dioxide and the like for electroplating, and dried after being fully electroplated so as to obtain the environment-friendly type stainless steel welding wire not plated with copper. The preparing method obviously improves the ductility, toughness and high temperature resistance of the welding wire by electroplating one layer of nickel and titanium dioxide on the surface of the low-carbon steel wire, avoids the problems of environment pollution and physical health hazards, caused in an original welding wire copper plating production process, improves the safety of a welding wire preparing process, and has wide application prospects.

The invention discloses a device and a method for making a high-reflectance microprism working mold and relates to a microprism. An electroforming groove, an anode, a cathode, a bracket device and an ultrasonic system are arranged on the device, wherein a frame body, an anode, a cathode and a flange fixing rod are arranged on the bracket device; the anode, the cathode and the flange fixing rod are fixedly connected to the top of the frame body; a tool head, a flange, an amplitude-change pole and an ultrasonic power supply are arranged on the ultrasonic system; the front end of the tool head is arranged on the outer side of the cathode; the back end of the tool head is connected with the front end of the amplitude-change pole by virtue of the flange; the back end of the amplitude-change pole is connected with the ultrasonic power supply. The method comprises the following steps: adding water into the electroforming groove, and adding nickel sulfate hexahydrate and nickel chloride in sequence; adding boric acid into hot water, boiling, adding dodecyl sodium sulfate, dissolving, pouring into the electroforming groove, adding saccharin and 1,4-butynediol into the electroforming groove, and filling the electroforming groove with water to obtain an electroforming liquid; putting the anode into an anode basket, connecting a positive pole, connecting a nickel master mold with the cathode, and connecting the upper end of the cathode with the foremost end of the tool head; electroforming, and demolding to obtain the working mold.

The invention relates to the technical field of adhesives, particularly to a high-strength moisture-proof starch glue and a preparation method and application method thereof. The high-strength moisture-proof starch glue is composed of the raw materials including, by weight part, 100 parts of corn starch, 4-20 parts of phenolic oligomer, 2-10 parts of polylactic acid, 0.5-3 parts of borax, 0.5-5 parts of nickel sulfate hexahydrate, 2-15 parts of sodium peroxide, 1-5 parts of tributyl phosphate and 200-300 parts of water. The h high-strength moisture-proof starch glue is high in bonding strength in humid environments, product bonding stability and moisture-proofness, has anti-mildew effects and avoids environmental pollution when degraded. The preparation method of the h high-strength moisture-proof starch glue is simple and convenient to apply.

A preparation method for a steel strip covered by a nickel-iron/nickel-cobalt double coating, comprising the following steps: Step 1: mixing sodium carbonate, sodium phosphate dodecahydrate, sodium silicate and sodium hydroxide, and placing the steel strip in the first mixture , the steel strip is soaked in sulfuric acid to activate and remove impurities; step 2: nickel sulfate hexahydrate, nickel chloride hexahydrate, boric acid, and sodium lauryl sulfate are mixed, and the steel strip body is placed in the second mixture for the first electroplating; Step 3: heat-treat the steel strip with the nickel-plated layer, mix sodium hydroxide, sodium carbonate, sodium phosphate dodecahydrate and sodium silicate, soak the steel strip with the nickel-plated layer in the third mixture, wash with water and perform cathodic activation process Removing the oxide film of the steel strip with the nickel-plated layer; step 4: mixing cobalt sulfate heptahydrate, nickel sulfate hexahydrate, sodium citrate dihydrate, boric acid, sodium dodecylsulfonate, sodium saccharin and butynediol , the steel strip substrate with the nickel-plated layer is put into the fourth mixture for the second electroplating, and is successively washed and dried.

The invention provides a method for preparing nano nickel selenide with an octahedral structure, and belongs to the technical field of preparation of nano materials. The method is characterized by comprising the following steps of: adding 0.1314 gram of nickel sulfate hexahydrate and 0.0866 gram of sodium selenite into a 25-milliliter high-pressure reaction kettle with a polytetrafluoroethylene lining, adding 20 milliliters of ethylene glycol, stirring for 20 minutes, closing the reaction kettle, putting into a digital display temperature control furnace, and reacting for 24 hours at the temperature of 180 DEG C; and performing three times of centrifugal washing on the obtained sample, drying, and thus obtaining the product. An organic template and a surfactant are not required in the method, and the nano nickel selenide is synthesized in one step and has high yield and the octahedral structure; the method is simple, energy-saving and suitable for industrialized production; and the obtained octahedral nickel selenide has a good catalytic effect on decomposition of hydrazine hydrate.

The invention discloses a preparation method for cobalt-manganese-nickel oxides. The preparation method comprises steps of separately dissolving industrial products including manganese sulfate monohydrate, cobaltous sulfate heptahydrate and nickel sulfate hexahydrate by hot water, gradually adding a NH4HCO3 solution for performing a neutralization reaction and a precipitation reaction, then continuing to add a KOH solution to react, discharging, filtering, washing by water until SO42-ions disappear, drying, roasting by a high-temperature furnace at the temperature of 820 DEG C for 2-3 hours, ball milling and smashing, stirring and washing by hot water, then filtering, washing, drying and smashing to obtain the cobalt-manganese-nickel oxides. The preparation method is simple, easy to operate, and low in production cost; and the prepared cobalt-manganese-nickel oxides are excellent in product uniformity, stability and electric property, and low in production cost, and can be used for industrial production.

The invention discloses a preparation method of a ferronickel catalyst for hydrogen production by electrolysis of water, which comprises the following steps: (1) adding nickel sulfate hexahydrate and ferrous sulfate heptahydrate into water for dissolving to obtain a dissolved solution; (2) selecting sodium chloride, boric acid, sodium citrate, a benzenesulfinic acid agent, lauryl sodium sulfate and saccharin as regulator raw materials, sequentially adding the regulator raw materials into the dissolved solution, and uniformly mixing to obtain a dark green transparent mixed solution; (3) adjusting the pH value of the mixed solution to 3-3.5 to obtain an electroplating solution; (4) transferring the electroplating solution into an electroplating bath, and raising the temperature to 45-55 DEG C; and (5) selecting a nickel net as a carrier, using an electrochemical workstation, and carrying out electrodeposition by adopting a chronoamperometry to obtain the nickel-iron alloy catalyst. According to the invention, the electrodeposition conditions are controlled, and the composition and morphology structure of the plating layer are regulated and controlled by changing the composition of the plating solution, so that the electrocatalytic performance of the nickel-iron catalyst is accurately controlled, and the catalyst has good catalytic performance and stable performance.

The invention discloses electrodeposit nickel plating solution for a deformation zinc alloy and an electrodeposit nickel plating method thereof. The solvent of the electrodeposit nickel plating solution is deionized water, and a solute comprises nickel sulfate hexahydrate (110-130g/L), sodium chloride (10-15g/L), boric acid (30-35g/L) and sodium citrate (80-170g/L). In the electrodeposit nickel plating method, before electrodepositing, the pH value of the electrodeposit nickel plating solution is regulated to 4.8-6.9, the temperature of the electrodeposit nickel plating solution is kept at 20-30 DEG C, and the cathode current density is 0.8-1.5 amperes/dm<2>. The electrodeposit nickel plating solution does not contain prussiates and has the advantages of no pollution and good stability. The cladding surface made by the electrodeposit nickel plating method has no fringes, no cracks when being observed by a metalloscope, and no bubbling or stripping in case of thermal shock at 150 DEG C; and the discolored area on the paste surface does not exceed 10%.

The invention provides a method for preparing a high-reflectance working mould of microprism reflecting films by utilizing ultrasonic electroforming, and relates to microprisms. The method comprises the following steps of preparing electroforming solution, namely adding hot water into an electroforming tank, then adding nickel sulfate hexahydrate and nickel chloride in sequence, adding hot water into a container, then adding boric acid, then boiling the mixture, then adding lauryl sodium sulfate, pouring the solution into the electroforming tank after lauryl sodium sulfate is dissolved, adding saccharin and 2-butyne-1,4-diol into the electroforming tank, then injecting water to fully fill the electroforming tank and regulating the pH value to be 4.2; putting an anode nickel sheet into an anode basket, connecting the anode nickel sheet to an anode and connecting a nickel master mould to a cathode to carry out electroforming, and carrying out cathode demoulding to obtain the high-reflectance working mould of the microprism reflecting films. The method has the advantages that the ultrasonic parameters can be conveniently regulated by utilizing an ultrasonic washing machine during production; the coefficient of retroreflection of the microsized working mould of the microprism reflecting films can be controlled by regulating the ultrasonic parameters and the electroforming solution formula.

The invention relates to a preparing method of nano-nickel phosphide. The preparing method comprises the steps of adopting nickel sulfate hexahydrate and yellow phosphorous and adding dipotassium phosphate to conduct liquid phase reduction reaction to prepare nano-nickel phosphide sol; conducting microwave heating reaction, centrifugation, ethyl alcohol rinsing and drying to obtain the nano-nickel phosphide. According to the preparing method of the nano-nickel phosphide, the prepared nano-nickel phosphide has an uniform particle size, good dispersibility, and the particle diameter is smaller than 10 nm; meanwhile, a microwave-hydrothermal method is adopted to replace a traditional hydrothermal method so as to obtain the nano-nickel phosphide, and the preparing method of the nano-nickel phosphide is characterized by having a simple technology, a short production cycle, energy conversation and environment protection property, a good safety property and the like.

The invention discloses a chromium-nickel alloy electroplating solution and an electroplating method. The chromium-nickel alloy electroplating solution includes: 90-120g/L chromium chloride hexahydrate, 25-50g/L nickel sulfate hexahydrate, 50-70g/L ammonium bromide, 130-140g/L citric acid, 55-70g/L formic acid, 0.3-0.5g/L an emulsifier and the balance a solvent. The solvent is a mixed solution of DMF and water in a volume ratio of (0.8-1.05):1. The chromium-nickel alloy electroplating solution provided by the invention adopts the mixed solution of DMF and water as the solvent of the electroplating solution, citric acid and formic acid are taken as the compound complexing agent, citric acid and formic acid are selected as the buffering agent to replace boric acid, thus simplifying the formula, enhancing the hardness and corrosion resistance of the coating, and improving the dispersion ability and deep plating ability of the electroplating solution.

The invention relates to a method for preparing V2O5-adding NiCuZn ferrites, which is characterized in that a ferrite precursor is synthesized in a four-mouth flask under the conditions of water bath, electric heating, stirring, water-cycling condensation and argon protection by using nickel sulfate hydrate, copper sulfate hydrate, zinc sulfate hydrate and ferrous sulphate hydrate as raw materials, using ammonium oxalate as precipitating agent, using polyvinyl alcohol as dispersant, using ethanol as detergent, using vanadium oxide as sintering agent and using argon as protective gas. The particular steps are as follows: preparing blended solution firstly; filtering, washing and drying so as to obtain precursor powder; calcining the precursor powder at a temperature of 800 DEG C; then adding vanadium oxide as sintering agent and deionized water into the precursor powder; carrying out ball-milling on the obtained mixture; pressing the mixture subjected to ball-milling into circular cake-shaped products; finally, carrying out low-temperature sintering on the circular cake-shaped products at a temperature of 870 DEG C so as to obtain the final product. The preparation method is advanced, and grains are uniform and stable in chemical and physical properties, therefore, the preparation method is an ideal method for preparing the NiCuZn ferrites.

The invention discloses a wide-temperature-range reversibly thermochromic coordination polymer material and a preparation method and application thereof. The molecular formula of the coordination polymer material is {[Ni2(SO4)2(H3tpb)2(H2O)2].2H2O}n, wherein H3tpb is 1,3,5-(pyrazolyl)benzene. The coordination polymer material is prepared by adopting a solvothermal method. The specific preparationmethod comprises the following steps: dissolving nickel sulfate heptahydrate and 1,3,5-(pyrazolyl)benzene in a mixed solution of methanol and water, carrying out a solvothermal reaction at 120-180 DEGC for 2-5 days, and carrying out heat treatment on the obtained product to obtain the thermochromic material. According to the preparation method, synthesis steps are simple, and yield is high; and the prepared thermochromic material is good in thermal stability and chemical stability, wide in discoloration temperature range, short in color compounding time, obvious in color change and good in reversibility and can be used for temperature detection.