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•
05 Apr 1979
TL;DR: In this article, the initial density is pref. 1.075-1.116 g/cm3, which remains at this value during plating, achieved by adding Na2SO4 as a dummy salt, and part of the bath is automatically and periodically removed at short time intervals and replaced by a replenishing soln.
Abstract: The bath contains nickel salt, sodium citrate, NH4Cl, NH4OH, sodium hypophosphite, a water-soluble polyhydroxy benzene, and a copper salt, with an initial density of 1.075-1.116 g/cm3, esp. 1.099 g/cm3 which remains at this value during plating. The initial density is pref. achieved by adding Na2SO4 as a dummy salt, and during plating, part of the bath is automatically and periodically removed at short time intervals and replaced by a replenishing soln. (R) and water to keep the density at 1.099. For Ni coating of a metal substrate, the latter is pref. first exposed as a cathode to a voltage of 8-12V for 2-10 seconds. Used e.g. for small or large relay poles made of metal sheet, or for substrates with a complex shape.
3 citations
16 Oct 2009
TL;DR: In this paper, four kinds of dispersing agents are selected and compared in this paper, and then isopropyl alcohol and activated carbon are selected to be better conformable.
Abstract: Phosphorus sludge is one kind of harmful waste from the yellow phosphorus industrial production. It can cause serious pollution to the environment. It was used to be a kind of raw material to produce sodium hypophosphite. However, phosphorus sludge is hard to decompose, so dispersing agent has to be added to increase the productive rate of sodium hypophosphite. Four kinds of dispersing agents are selected and compared in this paper, and then isopropyl alcohol and activated carbon are selected to be better conformable. The following results can be concluded as the optimum reaction condition of isopropyl alcohol and activated carbon: the most appropriate addition of isopropyl alcohol is 10mL/20g and the activated carbon is 6g/20g, the temperature is 85?, the ratio of water to phosphorus is 110:1 and the ratio of alkali to phosphorus is 4.0:1.
3 citations
TL;DR: In this paper, supported bimetal phosphide (NiCoP/SiO 2 ) catalysts with variable Ni/Co mole ratios at low temperature were synthesized by a novel route using sodium hypophosphite (NaH 2 PO 2 ·H 2 O), nickel acetate (Ni(AC) 2 ·4H 2O) and cobalt acetate(Co(AC), as materials.
3 citations
DOI•
01 Jun 1997TL;DR: In this article, cyclic voltametric investigations have been made to understand the electrochemical behaviour of sodium hypophosphite in electroless plating bath solution, and possible reaction steps at the anode and cathode have been identified.
Abstract: Cyclic voltametric investigations have been made to understand the electrochemical behaviour of sodium hypophosphite in electroless plating bath solution. The possible reaction steps at the anode and cathode have been identified. An ECE type of mechanism appears to be operative in the overall reaction during electroless plating. Both organic and inorganic species in the bath solution influence the voltammetric pattern of the hypophosphite. Temperature enhances the peak currents and changes the reaction mechanism. The oxidation potentials of the reaction steps vary with temperature and also the presence of organic components in the both solution.
3 citations
Patent•
09 Oct 1990
TL;DR: In this paper, the objective polyhexamethylene terephthalamide having high polymerization degree is produced by adding 0.05 to 5wt.% of sodium hypophosphite, etc., in the form of a solution of water, alcohol, etc.
Abstract: PURPOSE:To polymerize the subject polyhexamethylene terephthalamide while preventing the formation of gel by polymerizing a prepolymer composed mainly of a specific polyhexamethylene terephthalamide in the presence of a hypophosphorous acid metal salt under specific condition. CONSTITUTION:The objective polyhexamethylene terephthalamide having high polymerization degree is produced by adding 0.05 to 5wt.% (preferably 0.1 to 2wt.%) of preferably sodium hypophosphite, etc., in the form of a solution of water, alcohol, etc., to a prepolymer composed mainly of a polyhexamethylene terephthalamide having an intrinsic viscosity of >=0.1dl/g (preferably >=0.2dl/g) and polymerizing the prepolymer at a temperature above 150 deg.C and below the melting point (preferably 240 to 300 deg.C) under reduced pressure or in an inert gas stream.
3 citations