Sodium hypophosphite

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

Nickel-phosphorus electrodeposits

Abstract: Nickel-phosphorus deposits produced chemically from solutions containing nickel salts and sodium hypophosphite are used extensively because they are normally uniform in thickness, but also because ...

Effects of Hard Surface Grinding and Activation on Electroless-Nickel Plating on Cast Aluminium Alloy Substrates

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

Cobalt-Molybdenum-Phosphorus Alloys: Electroplating and Corrosion Properties

Abstract: The relation between the composition, morphology, and corrosion resistance of the electrolytic CoMoP coatings plated at various current densities from citrate baths containing ammonia or hydrazine and various amounts of sodium hypophosphite is studied. Phosphorus was included in the coatings as a result of the electrochemical reduction of hypophosphite ions. Ternary Co-Mo-P alloys containing up to 26 at % Mo and up to 3 at % P were electroplated. Coatings of the highest quality were obtained from a bath containing hydrazine admixture at a temperature of 50°C. Corrosion resistance of CoMoP coatings increases with an increase in the Mo content and a certain decrease in the phosphorus amount in the deposit. The best protective properties were demonstrated by coatings obtained at higher concentrations of sodium hypophosphite and high deposition current densities when CoMoP alloys containing 23 ± 2 at % Mo and up to 1.5 at % P were formed.

Spherical amorphous nickel-phosphorus alloy particles with uniform size prepared at room temperature

Abstract: A new chemical method for preparing ultrafine amorphous Ni85P15 alloy particles with uniform size and spherical shape is reported. The particles were prepared by reduction of nickel chloride with sodium hypophosphite initiated with a drop of potassium borohydride solution at room temperature. The preparation mechanism, which consists of primary nucleation of NiB followed by autocatalytic deposition of the components, is discussed. The amorphous structure of the particles was identified by X-ray diffraction and selected area electron diffraction. X-ray photoelectron spectroscopy indicated that nickel and phosphorus are present as an alloy. Transmission election microscopy revealed that the particles are uniform and spherical with a diameter of about 100 nm.