Sodium hypophosphite

About: Sodium hypophosphite is a research topic. Over the lifetime, 1695 publications have been published within this topic receiving 15932 citations.

Magnesium alloy fluoride-free hydrazine chemical nickel plating solution and nickel plating process thereof

Abstract: The invention discloses a magnesium alloy fluoride-free hydrazine chemical nickel plating solution and a nickel plating process thereof. The nickel plating solution comprises an alkaline fluoride-free hydrazine chemical nickel plating solution and an acidic fluoride-free hydrazine chemical nickel plating solution; the pH value of the alkaline fluoride-free hydrazine chemical nickel plating solution is greater than or equal to 13, and the alkaline fluoride-free hydrazine chemical nickel plating solution consists of nickel chloride, hydrazine, a complexing agent, sodium hydroxide or potassium hydroxide, boric acid or thiourea; the pH value of the acid fluoride-free hydrazine chemical nickel plating solution is 4-6, and the acidic fluoride-free hydrazine chemical nickel plating solution consists of a nickel salt, sodium hypophosphite, citric acid and thiourea. The nickel plating process comprises the following steps: polishing, removing oil and grease, carrying out alkaline washing, pickling, activating, carrying out alkaline fluoride-free hydrazine chemical nickel plating, carrying out acidic fluoride-free hydrazine chemical nickel plating, and passivating. The plating solution is free of fluorine in component, safe in composition, and does not pollute the environment; the service life of the alkaline fluoride-free hydrazine chemical nickel plating solution is long; an outer layer of a composite coating obtained by nickel plating is an amorphous-state nickel phosphorus alloy; and the compact coating is high in compactness, relatively good in corrosion resistance and high in binding force, and has a good industrial application prospect.

Anti-corrosion anti-dirt heat transfer surface and preparation method thereof

Abstract: The invention relates to an anti-corrosion anti-dirt heat transfer surface and a preparation method thereof, and belongs to surface treatment and preparation methods. The heat transfer surface is prepared by adding cupric sulfate main salt, PTFE emulsion, carbon-fluorine cationic surface active agent, and sodium citrate complexing agent and ammonium acetate buffering agent into nickel sulfate main salt and sodium hypophosphite (reducing agent). The preparation method is as follows: dissolving nickel sulfate main salt and cupric sulfate main salt by deionized water, stirring, respectively adding sodium citrate complexing agent and ammonium acetate buffering agent dissolved by deionized water, mixing the two obtained solutions uniformly, adding sodium hypophosphite (reducing agent) dissolved by deionized water, adding PTFE emulsion dispersed uniformly by carbon-fluorine cationic surface active agent, mixing completely and uniformly, regulating the pH value of the mixed solution to 8.8-9.2 by sodium hydroxide, and finally forming a Ni-Cu-P-PTFE amorphous alloy anti-corrosion anti-dirt heat transfer surface on an activated workpiece surface at the temperature of 80-90 DEG C. The method is simple, convenient to operate and good in use effect.

Synthesis of energy saving integrated flowsheet for sodium hypophosphite production

Abstract: The significant potential for energy saving in sodium hypophosphite production using pinch technology is shown. Economy due to application of heat recovery system is 1 200 000 USD. Installation of new recuperative heat exchangers will cost about 1 400 000 USD and payback period is 14 months.

Preparation method of cellulose fabric having antibacterial and inflaming-retarding functions

Abstract: The invention relates to a preparation method of a cellulose fabric having antibacterial and inflaming-retarding functions, belonging to the field of production of textiles. The preparation method comprises the following steps: dissolving chitosan phosphate into a butanetetracarboxylic acid solution, adding sodium hypophosphite having catalytic amount into the solution to prepare fabric treatment fluid, and dipping the cellulose fabric into the fabric treatment fluid, taking out and rolling for drying the fabric. According to the technical scheme, sodium hypophosphite is used as a catalyst, chitosan phosphate is dissolved into butanetetracarboxylic acid to be prepared into the fabric treatment fluid, and the cellulose fabric is dipped into the fabric treatment fluid, is taken out and is rolled to be dried, thus, the cellulose fabric has antibacterial and inflaming-retarding functions and has remarkable beneficial effects.

Electroless plating method and apparatus therefor

Abstract: PROBLEM TO BE SOLVED: To easily reutilize produced waste at a low cost. SOLUTION: The electroless nickel plating method is performed with a plating solution 100 using nickel hypophosphite as a nickel source 101, and using at least two kinds selected from nickel hypophosphite, sodium hypophosphite and hypophosphorous acid as a reducing agent. In this method, a part of the plating solution 100 in a plating tank 20 is extracted into a first treatment tank 11, and at least one kind selected from calcium hydroxide and calcium carbonate is added to the inside of the first treatment tank 11. The produced precipitated calcium phosphite 105 is separated and removed from the plating solution 100 by a solid-liquid separator 14. After that, the plating solution 100 is controlled by a second treatment tank 15, and is then returned to the inside of the plating tank 20, so that the concentration of phosphorous ions produced in the plating solution 100 within the plating tank 20 is held within a fixed range.