Topic
Sodium hypophosphite
About: Sodium hypophosphite is a research topic. Over the lifetime, 1695 publications have been published within this topic receiving 15932 citations.
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Patent•
01 May 2013
TL;DR: In this article, a method for modifying an electrochemical performance of a hydrogen storing alloy by applying nickel/polyaniline was proposed, which mainly consisted of the following steps: nickel sulfate, sodium hypophosphite, succinic acid, aniline, sulfuric acid and cement are prepared to mixed solution; hydrogen stored alloy powder with meshes of 100-400 is dipped in the mixed solution, and is stirred for 5-20 minutes under the condition of stirring speed of 120-300 r/min.
Abstract: The invention relates to a method for modifying an electrochemical performance of a hydrogen storing alloy by applying nickel/polyaniline. The method mainly comprises the following steps: nickel sulfate, sodium hypophosphite, succinic acid, aniline, sulfuric acid and cement are prepared to mixed solution; hydrogen storing alloy powder with meshes of 100-400 is dipped in the mixed solution, and is stirred for 5-20 minutes under the condition of stirring speed of 120-300 r/min; the hydrogen storing alloy powder after the reaction is washed by water, is filtered, is dried in vacuum in a vacuum drying box; and a conductive nickel/polyaniline compound layer is formed through attaching on the surface of the hydrogen storing alloy powder. The method has the advantages of simple process and technique, no need of adding organic solvent in the polyaniline generation process and low production cost, and improves the high-rate discharge performance and the circulating stability of the hydrogen storing alloy.
2 citations
Patent•
06 Jun 2012
TL;DR: In this paper, a chemical nickel plating method of an Mg-Gd-Y-Zr (wt%) magnesium alloy was proposed, where the pre-plating pretreatment process comprises five steps of removing oil, activating, acid-washing, reactivating and zinc galvanizing; the chemical nickel solution takes basic nickel carbonate as main salt, sodium hypophosphite as reducing agent, hydrofluoric acid as a corrosion inhibitor, lactic acid as complex agent and mixed liquor of cadmium sulfate and potassium iodate as a brightening agent;
Abstract: The invention relates to a chemical nickel plating method of an Mg-Gd-Y-Zr (wt%) magnesium alloy The method comprises pre-plating pretreatment of a magnesium alloy matrix and deposition of a chemical nickel plating layer through chemical nickel plating, wherein the pre-plating pretreatment process comprises five steps of removing oil, activating, acid-washing, reactivating and zinc galvanizing; chemical nickel plating solution takes basic nickel carbonate as main salt, sodium hypophosphite as a reducing agent, hydrofluoric acid as a corrosion inhibitor, lactic acid as a complex agent and mixed liquor of cadmium sulfate and potassium iodate as a brightening agent; and a plating component is subject to zinc galvanizing and then electroless plating at the temperature about 85 DEG C to obtain the bright, flat, uniform and compact nickel plating layer The chemical nickel plating method is applicable to chemical nickel plating on the surface of the Mg-Gd-Y-Zr magnesium alloy, thus achieving the purpose of protecting the magnesium alloy The chemical nickel plating method has the advantages of fast plating speed, good protectiveness, simple operation and easy control
2 citations
Patent•
10 May 2001
TL;DR: In this article, the extraction of metallic nickel from spent acid hypophosphite solutions of chemical nickel plating has been studied, where finely dispersed nickel powder is added as catalyst to spent solution, and stepwise treatment is then carried out with dry sodium carbonate at temperatures from 55 to 65 C and pH of 6-7.
Abstract: extraction of metallic nickel from spent acid hypophosphite solutions of chemical nickel plating. SUBSTANCE: finely dispersed nickel powder is added as catalyst to spent solution, and stepwise treatment is then carried out with dry sodium carbonate at temperatures from 55 to 65 C and pH of 6-7. Nickel is extracted in the form of finely dispersed power containing 99.5% of nickel. In this case no additional amount of hypophosphite is required, increased extraction of nickel is attained from solution at molar ratio of sodium hypophosphite to nickel ions of 1:1. EFFECT: more efficient extraction method. 1 ex
2 citations
Patent•
22 Sep 2017
TL;DR: In this paper, a preparation method for an Fe-Cu-Ni-P alloy and a method for its preparation in powder metallurgy has been proposed, which is more uniform in component and performance distribution and has good mechanical performance and quality stability; and besides, the method is simple in preparation process.
Abstract: The invention relates to an Fe-Cu-Ni-P alloy and a preparation method thereof and belongs to the technical field of powder metallurgy. The Fe-Cu-Ni-P alloy is prepared according to the preparation method of the Fe-Cu-Ni-P alloy. The preparation method comprises the steps that carbonyl iron powder is subjected to chemical copper plating and surface activating treatment in a copper plating solutionwith copper sulfate as the main component, the carbonyl iron powder is subjected to chemical nickel and phosphorus plating in a plating solution of nickel sulfate and sodium hypophosphite after copperplating, and Fe-Cu-(Ni-P) compound powder is obtained, wherein the Fe-Cu-(Ni-P) compound powder mainly comprises, by mass, 63-88.5% of Fe, 0.5-5% of Cu, 10-30% of Ni and 1-2% of P; and the Fe-Cu-(Ni-P) compound powder is sintered after being subjected to pre-pressing formation. The Fe-Cu-Ni-P alloy prepared according to the method is more uniform in component and performance distribution and hasgood mechanical performance and quality stability; and besides, the method is simple in preparation process, low in cost and has high industrial prospects.
2 citations
Patent•
06 Apr 1993
TL;DR: In this paper, the subject composition improved in heat stability, prevented in coloring of a molded body and useful as a characteristics improver of a large-sized molded product by mixing a chlorinated polyethylene with a phosphorus based reducing agent.
Abstract: PURPOSE:To obtain the subject composition improved in heat stability, prevented in coloring of a molded body and useful as a characteristics improver of a large-sized molded product by mixing a chlorinated polyethylene with a phosphorus based reducing agent. CONSTITUTION:The objective composition obtained by mixing (A) 100 pts.wt. chlorinated polyethylene having 15-50wt.%, preferably 20-40wt.% chlorine content with (B) 0.01-5 pts.wt., preferably 0.05-4 pts.wt. phosphorus based reducing agent (e.g. ammonium hypophosphite or sodium hypophosphite). The composition is prepared by e.g. a method by adding the component B to the component A in an aqueous solution in the production process of the component A, method by dry-mixing the powdery component B with powder of the component A using a Henshel mixer, etc., and method melting and kneading the component A with the component B using a kneader, etc. Furthermore, melting, kneading and molding of the composition are preferably carried out at <=220 deg.C.
2 citations