Showing papers on "Sodium hypophosphite published in 2014"
TL;DR: In this article, a simple and inexpensive in-situ synthesis of copper nanoparticles on cotton fabric is carried out by using a chemical reduction method using copper sulfate as a precursor, citric acid as a stabilizing and protective agent against aggregation and oxidation of nanoparticles, and sodium hypophosphite as a reducing agent.
Abstract: Here, a simple and inexpensive in situ synthesis of copper nanoparticles on cotton fabric is carried out by using a chemical reduction method. Copper sulfate as a precursor, citric acid as a stabilizing and protective agent against aggregation and oxidation of nanoparticles, and sodium hypophosphite as a reducing agent were used. The treated cotton fabric was characterized by X-ray diffraction analysis, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and Fourier-transform infrared spectroscopy. The hydrophobicity, mechanical properties, and antibacterial efficiency of the samples were also studied. The excellent antibacterial behavior of fabrics containing copper nanoparticles even after 30 washing cycles confirms their potential for use in textile and medical products and demonstrates the high stability of the nanotreated fabric. Also, the nanocopper-treated fabrics indicated reasonable hydrophobicity.
74 citations
TL;DR: In this paper, an experimental study on the formation, characteristics and properties of electroless nickel phosphorous (Ni-P) coatings and Ni-P-Al 2 O 3 ) coating with varying reducing agent concentration was conducted.
71 citations
01 Jan 2014
TL;DR: In this paper, a study on mechanical and fracture properties, through the experimentation techniques has been carried out on a Al 7075-T6 and it coated with an Electroless Nickel deposits of 10-20μm in coating thickness.
Abstract: A study on mechanical and fracture properties, through the experimentation techniques has been carried out on a Al 7075-T6 and it coated with an Electroless Nickel deposits of 10–20 μm in coating thickness. In the recent years there has been considerable interest in the Electroless Nickel plating due to its extensive use in electronics, automobiles, aerospace and other industries. Electroless Nickel plating is a controlled autocatalytic reduction of nickel ions using suitable reducing agent such as sodium hypophosphite. ASTM Standard – E 399 for plane strain fracture toughness determination was adhered in this investigation. The results obtained, show that the EN coating can give rise to a significant improvement in the fracture behavior (performance) of the substrate and also it has shown that EN coating exhibit a very good adhesive property to the alloy material when the tensile stresses exceeding the yield strength are applied to the system and performance of these pretreatments was studied by SEM analysis.
45 citations
TL;DR: In this article, poplar wood (Populus adenopoda Maxim) was treated with citric acid to various weight percent gains (WPGs) and the effect of SHP on the resulting properties of treated wood was investigated.
Abstract: Sodium hypophosphite (SHP) has been recog- nized as the most efficient catalyst in the esterification reaction of cellulosic fabrics with citric acid (CA), but both the high cost and the environmentally harmful property of SHP call for optimization of its application. In this study poplar wood (Populus adenopoda Maxim.) was treated with CA to various weight percent gains (WPGs) and the effect of SHP on the resulting properties of treated wood was inves- tigated. Esterification with CA can occur also in the absence of SHP, as evidenced by the resistance to water leaching of CA. Wood treated with CA alone to 36% WPG exhibited 7% bulking, 50% anti-swelling efficiency, 30% reductions of the modulus of rupture, and 50% lower impact strength. Treatments with CA in the presence of SHP provided wood properties comparable to wood treated with CA alone. Thus the application of SHP can be questioned from the point of view of an economic production and environmental protection.
40 citations
TL;DR: In this article, the influence of coating process parameters on the microhardness of electroless Ni-P-Al 2 O 3 composite coating with the help ofTaguchi analysis was investigated.
37 citations
TL;DR: In this paper, the effects of hypophosphite on morphology, composition, deposition rate, and corrosion behavior of chromium coatings were investigated, and the results indicated that the addition of (0.0-0.75 m) sodium hypophophosphate to the electrolyte resulted in increased micro-cracks and porosity.
Abstract: Chromium coatings were electrodeposited from trivalent chromium sulfate based electrolyte, containing sodium hypophosphite as a complexing agent. The effects of this agent on morphology, composition, deposition rate, and corrosion behavior of coatings were investigated. Results indicated that, the addition of (0.0–0.75 M) sodium hypophosphite to the electrolyte: 1) resulted in co-deposition of chromium with (12.0–17.4 wt.%) phosphorus; 2) decreased the deposition rate from 17.0 μm/h for Cr–C to 7.8 μm/h for Cr–17.2 wt.% P coatings; 3) deteriorated the corrosion performance of the coatings due to an increase in micro-crack density and porosity. However, the addition of (0.45 M) sodium hypophosphite to the trivalent chromium chloride based electrolyte, decreased corrosion current density of electrodeposited coatings from 2.8 to 1.4 μA/cm2.
26 citations
21 Sep 2014
TL;DR: In this article, the effects of hard surface polishing grits and activation on electroless-nickel (EN) plating on cast aluminium alloy substrates in sodium hypophosphite baths were examined.
Abstract: This work examined effects of hard surface polishing grits and activation on electroless-nickel (EN) plating on cast aluminium alloy substrates in sodium hypophosphite baths As-received aluminium alloy sample sourced from automobile hydraulic brake master cylinder piston was melted in electric furnace and sand cast into rod The cast samples were polished using different grits (60 μm–1200 μm) before plating The effects on adhesion, appearance, and quantity of EN deposits on substrates were studied Observation shows that the quantity of EN deposit is partly dependent on the alloy type and roughness of the surface of the substrates, whereas the adhesion and brightness are not solely controlled by the degree of surface polishing The best yield in terms of adhesion and appearance was obtained from the activation in zincate and palladium chloride solutions Higher plating rates (g/mm2/min) of , , and were obtained from chromate, zincate, and chloride than , , and as obtained from HCl etched, NaOH, and H2O activated surfaces, respectively
17 citations
TL;DR: In this paper, the Fourier transform infrared (FTIR) spectrometry technique was used to verify the ability of two polycarboxylic acids (PCAs) to form ester functions between the fibers.
Abstract: The use of two polycarboxylic acids (PCAs), such as 1,2,3,4-butanetetracarboxylic acid (BTCA) and citric acid (CA), was employed to esterify handsheets prepared from thermomechanical pulp (TMP) fibers. Sodium hypophosphite was used as a catalyst. The Fourier transform infrared (FTIR) spectrometry technique was utilized to verify the ability of these PCAs to form ester functions between the fibers. The modifications of both the temperature and the mass amount of the PCA were investigated. Finally, the wet breaking length of the prefabricated and cured handsheets was measured and an improvement was observed in both cases. The raise of the mass amount increased the wet breaking length for the two cases. On the other hand, a comparison between the two PCAs was carried out. For the same mass amount, BTCA was more effective to cross-link the TMP fibers at high temperature while CA showed slightly better results at low temperature.
16 citations
TL;DR: In this paper, the effect of sodium hypophosphite (NaH 2 PO 2 ) on the electrodeposition of graphite powders (graphite@Cu) was investigated.
15 citations
TL;DR: In this article, the authors used polyamino carboxylic acids (PACAs) and their combination with sodium hypophosphite (NaH2PO2) as a flame-retardant finishing system for cotton fabrics.
Abstract: SUMMARY
The purpose of this research was to use polyamino carboxylic acids (PACAs) and their combination with sodium hypophosphite (NaH2PO2) as a flame-retardant finishing system for cotton fabrics. Flammability of cotton fabric was evaluated by 45° flammability test, differential scanning calorimetry and measuring the char yield. The combination of polyamino carboxylic acids and sodium hypophosphite as a phosphorus-containing catalyst reduces the flammability of cotton. The pyrolysis properties and the results of char yield of the finished cotton show that with increasing amount of catalyst, the flame retardancy increases. Fastness against multiple laundering, whiteness and tensile strength of the cotton finished with PACAs/NaH2PO2 to multiple standard laundering have been studied, too. The flame retardancy effect has an acceptable washing fastness. Whiteness and tensile strength of the finished cotton do not change significantly. Copyright © 2012 John Wiley & Sons, Ltd.
13 citations
TL;DR: A plating test was carried out with changes in the concentration of nickel sulfate (NiSO4) and sodium hypophosphite (NaH2PO2) to analyze the plating characteristics depending on the balance of the electroless Ni-P plating solution as discussed by the authors.
Patent•
05 Mar 2014
TL;DR: In this paper, a sonochemistry preparation method allowing the surface of copper powder to be coated with a nickel and phosphorus alloy layer is presented. But the method is characterized in that high energy ultrasonic agitation is effectively added into a traditional process of chemical plating, and the cavitation effect, the oscillation effect and other effects of the high-energy ultrasonic agating are utilized, so that the preparation efficiency of composite copper powder coated with nickel is improved, and problems of powder accumulating and the like are solved.
Abstract: The invention relates to metal-coated composite powder, in particular to a sonochemistry preparation method allowing the surface of copper powder to be coated with a nickel and phosphorus alloy layer. The method is characterized in that high-energy ultrasonic agitation is effectively added into a traditional process of chemical plating, and the cavitation effect, the oscillation effect and other effects of the high-energy ultrasonic agitation are utilized, so that the preparation efficiency of composite copper powder coated with nickel is improved, and the problems of powder accumulating and the like are solved. In addition, when the copper powder coated with the nickel and phosphorus is prepared, sodium hypophosphite is used as a reducing agent of an acidic chemical plating solution, and the plating solution is easy to prepare and high in stability; due to the fact that activating treatment is carried out on the copper powder through hydrochloric acid before plating, the defect that traditionally, when salt activation and sensibilization are carried out on the surface of the copper powder, precious metal palladium salt is brought into the plating solution, so that the plating solution is decomposed is overcome, and also the activation processes of the powder are simplified. Meanwhile, because the high-energy ultrasonic agitation is kept in the whole plating process, the prepared composite powder is excellent in dispersity, the coating layer of the powder is complete and uniform, the plating of the powder is compact, and the powder is in an amorphous state.
Patent•
17 Dec 2014
TL;DR: In this article, a Ni/Zn/P-particle composite chemical plating solution was provided, which has better corrosion resistance and wear resistance, high zinc content and can carry out plating on the surface of a copper matrix directly.
Abstract: The invention provides a Ni/Zn/P-particle composite chemical plating layer, which is obtained by preparing a Ni/Zn/P-particle composite chemical plating solution. The Ni/Zn/P-particle composite chemical plating solution comprises nickel salt, zinc salt, particles, sodium hypophosphite, sodium borohydride, citrate, triethanolamine, quinoline-2-carboxylate, cationic surfactant, rare-earth salt and an alkaline compound, wherein the particles comprise one or more of oxide particles, carbide particles, nitride particles, sulfide particles, polymer particles and carbon particles, and the particle size of the particles is 10 nanometers to 45 micrometers. The invention provides a preparation method of the Ni/Zn/P-particle composite chemical plating layer. The preparation method comprises the step of immersing a substrate into the Ni/Zn/P-particle composite chemical plating solution to carry out plating to obtain the Ni/Zn/P-particle composite chemical plating layer. The Ni/Zn/P-particle composite chemical plating layer provided by the invention has better corrosion resistance and wear resistance, is high in zinc content and can carry out plating on the surface of a copper matrix directly.
TL;DR: In this paper, the influence of process parameters on the surface roughness of Ni-P-TiO 2 composite coatings with the help of Grey analysis and the Taguchi method is investigated.
01 Jan 2014
TL;DR: In this paper, a pad-dry-cure process was used to prepare Wool/PET fabric for enhanced deposition of titanium dioxide nanoparticles using citric acid as crosslinking agent in the presence of sodium hypophosphite.
Abstract: In this study, plasma treatment as an environmentally friendly process, was used to prepare Wool/PET fabric for enhanced deposition of titanium dioxide nanoparticles. TiO2 nanoparticles were stabilized on the fabric using citric acid as crosslinking agent in the presence of sodium hypophosphite by a pad-dry-cure process. SEM images confirmed the improved deposition of nanoparticles after plasma treatment. To investigate the self-cleaning property of the coated fabric, methylene blue staining test was employed. The changes in color differences of samples showed that an appropriate discoloration was achieved on the fabric samples treated with TiO2 after UV radiation.
Patent•
23 Apr 2014
TL;DR: In this paper, a preparation method of a graphene/copper composite material is described, which includes the following steps: step 1, weighing copper sulfate pentahydrate, nickel sulfate, citric acid and boric acid; step 2, placing the mixed solution A in a magnetic stirring water bath kettle for heating the mixed mixture A, then adding graphene oxide solution into the mixture B, stirring, and preparing B; step 3, adding sodium hypophosphite solution into B, and finally, performing an accelerated reaction and ultrasound dispersion treatment so as to obtain
Abstract: The invention discloses a preparation method of a graphene/copper composite material. The preparation method includes the following steps: step 1, weighing copper sulfate pentahydrate, nickel sulfate, citric acid and boric acid so as to prepare a mixed solution A, and stirring the mixed solution A; step 2, placing the mixed solution A in a magnetic stirring water bath kettle for heating the mixed solution A, then adding graphene oxide solution into the mixed solution A, stirring, and preparing a mixed solution B; step 3, adding sodium hypophosphite solution into the mixed solution B, stirring, and performing an accelerated reaction and ultrasound dispersion treatment so as to obtain a solution of the graphene/copper composite material which is evenly dispersed; step 4, performing repeated suction filtration on the solution by using a microfiltration membrane, repeatedly washing filter residues until PH (potential of hydrogen) value of the filter residues is neutral, performing vacuum drying, and performing reduction so as to obtain the composite graphene/copper composite material. The preparation method of the graphene/copper composite material is simple, convenient to operate, and low in cost, and has good application prospect.
Patent•
03 Dec 2014
TL;DR: In this article, the formation of electroless Ni-B-P alloy coatings and structural and morphological characterization of various coatings with different boron and phosphorous content were studied.
Abstract: The aim of the present investigation is to study the formation of electroless Ni-B-P alloy coatings and structural and morphological characterization of various coatings with different boron and phosphorous content. An alkaline plating bath with nickel chloride hexahydrate as the source of nickel ions and sodium borohydride and sodium hypophosphite as reducing agents were used for the formation of electroless Ni-B-P alloy coatings. The influence of changes in the concentrations of the reducing agents in the electroless plating bath on the chemical composition, structural and morphological characteristics of the coatings were studied. Scanning electron microscopic studies revealed that the surface morphology of Ni-B-P alloy coatings changed from corn cob-like structure to cauliflower-like structure with increasing borohydride concentration in electroless plating bath, whereas increase in hypophosphite concentration favoured sideway growth, thereby decreased the surface roughness of the Ni-B-P alloy coatings. The peak broadening in the X-Ray Diffraction profiles indicates the large reduction in the crystallite size of the electroless Ni-B-P alloy coatings with increasing boron content in the coating (i.e. for higher borohydride concentration in the plating bath).
Patent•
03 Dec 2014
TL;DR: In this paper, the sodium hypophosphite liquid phase reduction method was used to prepare nano or sub-micron silver particle powder, which can be applied to the fields of conductive slurry, conductive glue, electric contact material, catalyzing and the like.
Abstract: The invention relates to a preparation method of nano or sub-micron silver particle powder The preparation method is based on the sodium hypophosphite liquid phase reduction method to prepare the nano or sub-micron silver particle powder The preparation method is characterized in that water is used as solvent, inorganic acid, organic acid or salts are used as a main shape and size modifying agent, organic solvent is used as a dispersive agent or an auxiliary shape and size modifying agent, and sodium hypophosphite is used as a reduction agent The preparation method has the advantages that any surface active agent is not used, so the washing of products is easy, and the purity is high; nano similar-spherical silver particle powder, nano flaky agglomeration silver particle powder or sub-micron similar-spherical silver particle powder can be obtained; the shape and size uniformity of the silver particle powder prepared by the method is good, the purity of the silver powder is high, the yield rate and unit output of silver are high, and the preparation method can be applied to the fields of conductive slurry, conductive glue, electric contact material, catalyzing and the like
TL;DR: An experimental investigation for optimum tribological behavior (wear depth and coefficient of friction) of electroless Ni-P-Cu coatings based on four process parameters using artificial bee colony algorithm finds that, within the operating range, a lower value of nickel concentration, medium value of hypophosphite concentration, higher value of copper concentration, and highervalue of heat treatment temperature are suitable for having minimum wear.
Abstract: This paper aims to present an experimental investigation for optimum tribological behavior (wear depth and coefficient of friction) of electroless Ni-P-Cu coatings based on four process parameters using artificial bee colony algorithm. Experiments are carried out by utilizing the combination of three coating process parameters, namely, nickel sulphate, sodium hypophosphite, and copper sulphate, and the fourth parameter is postdeposition heat treatment temperature. The design of experiment is based on the Taguchi L27 experimental design. After coating, measurement of wear and coefficient of friction of each heat-treated sample is done using a multitribotester apparatus with block-on-roller arrangement. Both friction and wear are found to increase with increase of source of nickel concentration and decrease with increase of source of copper concentration. Artificial bee colony algorithm is successfully employed to optimize the multiresponse objective function for both wear depth and coefficient of friction. It is found that, within the operating range, a lower value of nickel concentration, medium value of hypophosphite concentration, higher value of copper concentration, and higher value of heat treatment temperature are suitable for having minimum wear and coefficient of friction. The surface morphology, phase transformation behavior, and composition of coatings are also studied with the help of scanning electron microscopy, X-ray diffraction analysis, and energy dispersed X-ray analysis, respectively.
Patent•
19 Nov 2014
TL;DR: In this paper, a printed wiring board chemical copper plating solution which is prepared from the following raw materials in parts by mass: 10-15 parts of chalcanthite, 30-35 parts of sodium hypophosphite, 10- 15 parts of boric acid, 12-18 parts of complexing agent, 0.05-0.1 part of stabilizer and 0.5-1.5 parts of catalyst.
Abstract: The invention discloses a printed wiring board chemical copper plating solution which is prepared from the following raw materials in parts by mass: 10-15 parts of chalcanthite, 30-35 parts of sodium hypophosphite, 10-15 parts of boric acid, 12-18 parts of complexing agent, 0.05-0.1 part of stabilizer, 0.5-1.5 parts of catalyst, 0.05-0.1 part of surfactant, 15-18 parts of sodium hydroxide and 300-320 parts of deionized water. By using the sodium hypophosphite as the main reducer, the chalcanthite, boric acid, complexing agent, stabilizer, catalyst, surfactant and sodium hydroxide are added to prepare the chemical copper plating solution; and the chemical copper plating solution is diluted to be used for chemical copper plating on the printed wiring board, thereby achieving the effects of the metallization of the non-conductor surface of the activated printed wiring board and the metallization in the printed wiring board holes. The printed wiring board chemical copper plating solution has the advantages of wide technological parameter range, long service life and no harmful formaldehyde vapor.
Patent•
04 Jun 2014
TL;DR: In this paper, a piece of glass with a graphene oxide nickel-phosphorus composite coating and a preparation method of the glass was shown. But the preparation method was not described.
Abstract: The invention discloses a piece of glass with a graphene oxide nickel-phosphorus composite coating and a preparation method of the glass. The glass with the graphene oxide nickel-phosphorus composite coating comprises a glass matrix and the graphene oxide nickel-phosphorus composite coating plated on the surface of the glass matrix, wherein the graphene oxide nickel-phosphorus composite coating is prepared by processing the glass matrix by oil removing, defouling, coarsening and activating, then soaking the glass matrix into a graphene oxide nickel-phosphorus chemical plating solution for 20 to 30 minutes, and finally completely cleaning with distilled water and drying; the graphene oxide nickel-phosphorus composite coating can be combined with the glass matrix well and shows high abrasive resistance, corrosion resistance and electric property; the graphene oxide nickel-phosphorus chemical plating solution per liter comprises 0.1 to 1g of graphene oxide, 25 to 35g of nickel sulfate, 25 to 35g of sodium hypophosphite, 15g of sodium acetate, 10 to 15g of phytic acid, 8g of sodium citrate, 10 to 15g of lactic acid, and 0.05g of compound sterilizer.
Patent•
19 Nov 2014
TL;DR: In this article, a hollow nanometer nickel sphere preparing method is described. But the method is not suitable for the use in the manufacturing process and it is not adaptive to industrial production.
Abstract: The invention relates to a hollow nanometer nickel sphere preparing method. The method includes on the condition of temperature ranging from 85 to 100 DEG C, dissolving nickel salt in the eutectic solvent and stirring; on the condition of temperature ranging from 110 to 150 DEG C, stirring for 20 to 50 min; adding water to the solution during stirring drip by drip, and stirring for 15 to 30 min at the temperature ranging from 110 to 150 DEG C; during stirring, retaining the temperature ranging from 85 to 100 DEG C, adding sodium hypophosphite aqueous solution in the mixture drop by drop, then heating 0.5 to 2 hours, and obtaining hollow nanometer nickel spheres. The method is simple and controllable in preparation, raw materials are easy to obtain, the method is safe and environment-friendly, cost is low, organic solvent is omitted during reaction, toxic substance emission is eliminated, and the method is adaptive to industrial production.
Patent•
23 Apr 2014
TL;DR: In this article, an electroless nickel plating solution treatment method was proposed, which includes steps: using spent bath of EN plating to produce powder; in a powder coating process, continually stirring the spent bath with powder added, heating and replenishing solution containing sodium hypophosphite, stirring and heating after the EN turned from nickel-rich blue solution into transparent solution; performing advanced oxidation, filtering out produced white precipitate of nickel hydroxide, and adding the white precipitates into a next batch of spent bath for dissolving and recycling; subjecting the
Abstract: The invention provides an electroless nickel plating solution treatment method. The method includes steps: using spent bath of electroless nickel plating to produce powder; in a powder coating process, continually stirring the spent bath of electroless nickel plating with powder added, heating and replenishing solution containing sodium hypophosphite, stirring and heating after the spent bath of electroless nickel plating turns from nickel-rich blue solution into transparent solution; performing advanced oxidation, filtering out produced white precipitate of nickel hydroxide, and adding the white precipitate into a next batch of spent bath of electroless nickel plating for dissolving and recycling; subjecting the solution treated at the last step to advanced oxidation. Nickel in the spent bath can be reduced below 1mg/L after the spent bath is treated by the method, recycling of 99.9% of nickel is realized while functional powder materials with high added value can be produced, and further, pollution of nickel to the environment is eliminated.
Patent•
23 Jul 2014
TL;DR: In this article, an environment-friendly high-phosphorus chemical nickel plating solution for an airtight glass-sealed binding terminal is presented. But, no nickel nuclear generated on sintered glass can be guaranteed, and the difficulty in keeping the smoothness and cleanness of the surface of glass can not be solved.
Abstract: The invention discloses an environment-friendly high-phosphorus chemical nickel plating solution for an airtight glass-sealed binding terminal. The environment-friendly high-phosphorus chemical nickel plating solution comprises the following active ingredients according to concentration: 25-27g/L nickel sulfate, 19-22g/L sodium hypophosphite, 20-23g/L sodium hydroxide, 41-44g/L lactic acid, 1.5-2.3g/L trisodium citrate, 13-15g/L malic acid, 8-12g/L glycine, 0.2-0.4ml/L OP-10, 0.26-0.3g/L stannous chloride, 0.26-0.34g/L maleic anhydride and 3-5mg/L N,N-diethylaminopropyne. The invention discloses a method for performing chemical plating by adopting the chemical nickel plating solution. A stainless steel needle and an iron cover can be simultaneously subjected to chemical nickel plating and be evenly plated, no nickel nuclear generated on sintered glass can be guaranteed, and the difficulty in keeping the smoothness and cleanness of the surface of glass can be solved.
Patent•
24 Dec 2014
TL;DR: In this paper, a method for preparing all-solid waste high-strength glass ceramics from a major material coke residue is presented, which can be used for the production of a building decoration material, an industrial wear-resistant and anticorrosive material and artware.
Abstract: The invention provides a method for preparing all-solid waste high-strength glass ceramics from a major material coke residue. The method is used for preparing the high-strength glass ceramics from such raw materials as 50-95% of coke residue, 0-45% of magnesium slag, 0-15% of white mud, 2-10% of titanium slag and 3-10% of sodium hypophosphite waste residue by use of high-temperature melting, molding by casting and primary crystallization. The method is simple in preparation process; besides, the utilization rate of solid waste is 100%, and the problem of pollution of such solid waste as coke residue, magnesium slag, white mud, titanium slag and sodium hypophosphite waste residue on the environment is solved. The prepared glass ceramics have the rupture strength of more than 300MPa, are wear-resistant, good in corrosion resistance, soft in color and luster, good in texture and high in value added and can be applied to the production of a building decoration material, an industrial wear-resistant and anticorrosive material and artware; as a result, the glass ceramics have wide market prospect.
Patent•
17 Dec 2014
TL;DR: In this paper, a method of nickel, ferrum and phosphorus ternary alloy chemical plating on the wood surface was proposed, which solved the technical problems that matarials obtained by the existing methods of nickel and phosphorus alloy plating are poor in corrosion resistance and magnetic property.
Abstract: The invention provides a method of nickel, ferrum and phosphorus ternary alloy chemical plating on the wood surface and relates to methods of the chemical plating on the wood surface The method aims at solving the technical problems that matarials obtained by the existing method of nickel and phosphorus alloy plating on the wood surface is poor in corrosion resistance and magnetic property The method comprises step 1, preparing a reducing agent through a potassium borohydride solution and a sodium hydroxide solution; step 2, preparing a plating solution through a nickel sulfate, ammonium ferrous sulfate, sodium hypophosphite, sodium potassium tartrate and ammonium sulfate solution in a mixing mode; step 3, enabling the wood to be dipped in the reducing agent and then to be dipped in the plating solution to obtain the wood, wherein the nickel, ferrum and phosphorus ternary alloy chemical plating is performed on the surface of the wood According to a plating layer which is produced by the method of the nickel, ferrum and phosphorus ternary alloy chemical plating on the wood surface, the magnetic property and the corrosion resistance are excellent, the saturation magnetization of the plating layer reaches 01737 emu, the corrosion resistance reaches above 41609 ohms, and the method can be widely applied to the electronic, aerospace and medical fields
TL;DR: In this paper, the influence of coating process parameters on the surface roughness of electroless Ni-P-Al2O3 composite coating with the help of Taguchi analysis is investigated.
Patent•
05 Mar 2014
TL;DR: In this paper, a preparation method of spherical aluminum hypophosphite was described, in which the mixture reacts with aluminum sulfate and melamine cyanurate seed crystal in the earlier stage of reaction, and different dispersants are added to improve the dispersion effect.
Abstract: The invention discloses a preparation method of spherical aluminum hypophosphite. In the method disclosed by the invention, sodium hypophosphite reacts with aluminum sulfate; meanwhile, melamine cyanurate is added as a seed crystal in the earlier stage of reaction, and different dispersants are added to improve the dispersion effect. The spherical aluminum hypophosphite prepared by the method disclosed by the invention has the characteristics of small particle size, regular crystal form and the like, thus the drop of mechanical properties of plastics after the addition of a flame retardant is reduced. Meanwhile, by adopting the melamine cyanurate seed crystal as a synergist in the flame retardant, the flame retardance effect of aluminum hypophosphite after plastic addition is remarkably improved.
Patent•
24 Sep 2014
TL;DR: In this article, a copper wire nickel-plating electrolyte and a preparation method for nickel plating is described, which includes the following materials: 300-350 g/L of nickel sulfate, 10-15 g/l of sodium hypophosphite, 32-40 g/ l of boric acid, 3-5 g/dL of hydrogen peroxide and active carbon, and the balance of deionized water.
Abstract: The invention relates to the technical field of copper wire nickel plating and discloses copper wire nickel-plating electrolyte and a preparation method thereof The copper wire nickel-plating electrolyte comprises the following materials: 300-350 g/L of nickel sulfate, 10-15 g/L of sodium hypophosphite, 32-40 g/L of boric acid, 3-5 g/L of hydrogen peroxide, 3-5 g/L of active carbon, 005-015 g/L of a surfactant, 05-2 g/L of a rear-earth additive, and the balance of deionized water The nickel plating electrolyte disclosed by the invention is reasonable in formula, not too low in pH value, capable of avoiding separating out much hydrogen on a cathode, high in cathode efficiency, and free of needle holes on the coating; the copper wire nickel-plating electrolyte disclosed by the invention is added with the rear-earth additive, so that dispersion capacity of the nickel-plating liquor is remarkably improved; the rear earth elements have a certain effect on inhibiting hydrogen evolution reaction and can improve current density of the nickel-plating liquor