Sodium hypophosphite

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

Production method for forming function gradient composite coating and its plating liquid

Abstract: The invention relates to a preparation method for forming functionally graded composite coating and plating bath thereof. Solid particles are made to be distributed in continuous gradient in the coating through controlling the content of the solid particles in the plating bath in the process of plating. The plating bath comprises the following components: 15 to 40g/L of nickel sulphate, 10 to 40 ml/L of lactic acid, 1 to 10ml/L of propionic acid, 10 to 40 g/L of sodium acetate, 10 to 40g/L of sodium hypophosphite, and 0.1 to 5mg/L of stabilizer. The preparation method belongs to a wet type method without high temperature and pressure; the temperature is usually lower than 100 DEG C, thereby having good effects on maintaining the good performance and structure of the solid particles and the property of the interface between the particles and the metal. No liquid phase metal exists in the preparation process, so the accuracy of the material is correctly controlled and processing cost is saved. The device used is simpler; the operation parameters are easily controlled; and the complex work pieces are easily processed. The method is suitable for automated production, and has higher economical efficiency compared with other methods.

Preparation method of highly dispersed supported nickel phosphide catalyst

Abstract: The invention provides a preparation method of a supported nickel phosphide catalyst for catalyzing hydrodeoxygenation of phenol and a derivative thereof. The catalyst is supported nickel phosphide. The preparation method comprises the following steps: 1, taking nickel nitrate hexahydrate and dissolving nickel nitrate hexahydrate in deionized water to form a solution; 2, adding a carrier, and performing continuous stirring and heating; 3, weighing urea and adding urea into the obtained solution, and adding concentrated nitric acid; 4, dropwise adding the solution obtained in the step 3 into the suspension solution in the step 2, performing heating after the drop addition is completed, and continuously carrying out a reaction; 5, performing vacuum filtration, performing washing with deionized water until a filtrate is neutral, and performing drying in an oven overnight to obtain a gray-black solid; 6, preparing an acetic acid-sodium acetate buffer solution, then adding sodium hypophosphite and performing continuous stirring and heating, and slowly adding a precursor compound; and 7, performing vacuum filtration after a reaction, performing washing with deionized water until a filtrate is neutral, performing drying in an oven overnight, performing heat treatment in a chemical atmosphere, and then performing cooling annealing to obtain the supported nickel phosphide catalyst. Thecatalyst obtained by the method has good dispersity, small particle size and good HDO activity.

Preparation method for tazobactam intermediate

Abstract: The invention discloses a preparation method for a tazobactam intermediate. The method comprises the following steps of: under the action of peracetic acid, enabling 6-APA to react with diphenyl hydrazone to generate a compound 4; under the action of sulfuric acid and sodium nitrite, enabling the compound 4 to generate diazonium salt, and adding sodium hypophosphite to remove an amino to generatea compound 5. Compared with an existing preparation method, the preparation method is moderate in reaction condition, short in process, high in yield and simple in post-treatment, and easier to industrial production. The compounds are shown in the description.

An investigation over the effect of the reducing agent on the properties of the ZnO-reinforced Ni–P coatings

Abstract: Electroless ZnO-reinforced Ni–P coatings are developed on mild steel substrates in the Electroless bath, which contains an optimum concentration of ZnO nanoparticles. This work focuses on the characteristics and properties of the Ni–P–ZnO coatings developed at different concentrations of reducing agent (sodium hypophosphite). Results confirm that the reducing agent greatly influences the deposition rate, surface roughness, hardness, and corrosion resistance of the coating. Reducing agent concentration influences the phosphorus present in the coating. An increase in the amorphous nature of the coating with an increase in reducing agent concentration improves the resistance to corrosion of the coating, but at the same time, it decreases the microhardness of the coating. High phosphorus deposition at the maximum amount of reducing agent concentration lowers the microhardness of the coating. The Hard Ni3P crystalline phase formed at 400 °C enhances the resistance to corrosion and microhardness of the coating. Scanning electron microscopy and X-ray diffraction studies are used to characterize the Ni–P–ZnO coating. The microhardness and corrosion resistance of the coating were evaluated using a Vickers microhardness tester and potentiodynamic polarization studies.

Volumetric Properties and Ion Interactions for Sodium Hypophosphite Aqueous Solution from 283.15 to 363.15 K at 101.325 kPa

Abstract: Densities of sodium hypophosphite aqueous solution (NaH2PO2) with the molality varied from 1.019143 to 10.43887 mol kg–1 at temperature intervals of 5 K range from 283.15 to 363.15 K at 101.325 kPa were measured by a precise Anton Paar Digital vibrating-tube densimeter. From the density data, the thermal expansion coefficients, apparent volume and partial molar volumes were obtained. According to the Pitzer ion-interaction equation of the apparent molar volumes, the Pitzer single-salt parameters and their temperature-dependent correlation for NaH2PO2 were firstly obtained by the least-squares method. The model shown that apparent molar volumes agree well with the experimental values, which indicated the single salt parameters and the temperature-dependent formula are reliable.