Sodium hypophosphite

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

Process for preparing polycarbonate

Abstract: An improved process for preparing an aromatic polycarbonate, which improvement comprises carrying out the reaction in the presence of a minor amount of a particular hypophosphite such as alkali earth metal or alkali metal hypophosphite and, in particular, sodium hypophosphite. The mere employing of the particular additive in the reaction medium results in a polycarbonate having improved resistance to thermal degradation.

Production technology of fine bronzing plate with high precision and hardness

Abstract: The invention discloses a production technology of a fine bronzing plate with high precision and hardness. The production technology comprises the following steps : (1) loading materials; (2) chemical oil removal; (3) recycling washing; (4) electrolytic activation; (5) double cleaning; (6) nickel plating: carrying out chemical nickel plating by using a plating liquid containing 28 g / L nickel sulfate, 30 g / L sodium hypophosphite, 18 mL / L lactic acid (W = 85%), 13 g / L sodium acetate, 8 mg / L potassium iodate and purified water, adjusting the pH value of the plating liquid to 4.6-4.9, stirring at 85-91 DEG C for 3-5 min; (7) double cleaning; (8) drying; and (9) rolling. The invention employs electrolytic activation in advance and nickel preplating to substantially enhance firm combination degree of a nickel coating and a copper base and prolong service life of the bronzing plate.

Graphite nickel plating method

Abstract: The invention provides a graphite nickel plating method. The graphite nickel plating method comprises the steps of adding a graphite matrix into a nickel plating solution, and carrying out a reactionso as to obtain nickel plated graphite, wherein the nickel plating solution comprises the following components by content: 20 g/L to 35 g/L of nickel sulfate hexahydrate, 8 g/L to 30 g/L of lactic acid, 2 g/L to 18 g/L of triethanolamine, 20 g/L to 45 g/L of sodium citrate, 10 g/L to 35 g/L of ammonium chloride, 30 g/L to 45 g/L of sodium hypophosphite, 0.01 mg/L to 0.2 mg/L of L-arginine and 0.1mg/L to 10 mg/L of potassium ferrocyanide, pH is adjusted to be 8 to 9 through aqueous ammonia, and the temperature of the nickel plating solution is 30 DEG C to 45 DEG C. According to the graphite nickel plating method, complex technologies like surface degreasing, sensitization, metal palladium activation and peptization are eliminated, so that production efficiency is greatly improved; preciousmetal catalysis is not utilized, so that cost is reduced; and further, graphite powder is firstly subjected to copper plating and then is subjected to nickel plating, so that graphite powder has better electrical conductivity and tensile strength.

Method for chemically plating Ni-P-graphene composite coating on surface of red copper

Abstract: The invention provides a method for chemically plating a Ni-P-graphene composite coating on the surface of red copper The method comprises the steps of removing oil by adopting chemical degreasing liquid which is prepared from the following components: 10 to 30 g/L of sodium hydroxide, 5 to 20 g/L of sodium silicate, 10 to 30 g/L of sodium carbonate and 10 to 30 g/L of trisodium phosphate; then chemically plating by adopting composite plating liquid which is prepared from the following components: 20 to 50 g/L of nickel salt, 20 to 50 g/L sodium hypophosphite, 10 to 40 g/L of sodium acetate,1 to 10 g/L of malic acid, 5 to 20 ml/L of lactic acid, 01 to 10 g/L of surfactant, 1 to 10 mg/L of potassium iodate and 01 to 20 g/L of oxidized graphene in the step (A) The Ni-P-graphene composite coating formed on the surface of the red copper has the advantages of excellent corrosion resistance and high rigidity

Amorphous state iron phosphorus alloy electroplate liquid and preparation method

Abstract: The invention discloses an amorphous state iron phosphorus alloy electroplate liquid and a preparation method. Each L of electroplate liquid comprises 110-200g of ferrous sulfate, 15-50g of sodium hypophosphite, 15-30g of sodium citrate or 10.5-21g of citric acid, 30g of boric acid, 10g of sodium chloride, 20g of aluminum sulfate, 2g of ascorbic acid and water in balance amount. The preparation of 1 L of electroplate liquid is realizes by the following scheme: dissolving 15-30g of the sodium citrate or 10.5-21g of the citric acid into about 700mL of water; preparing sodium citrate water solution or citric acid water solution; sequentially adding 2g of the ascorbic acid, 30g of the boric acid, 110-200g of the ferrous sulfate, 10g of the sodium chloride and 20g of the aluminum sulfate; completely stirring and dissolving; adding 15-50g of the sodium hypophosphite; completely dissolving in a stirring way; and adding the water in balance amount till than the total volume is 1L. The plated film surface of the amorphous state iron phosphorus alloy which is electroplated with the electroplate liquid has less defects, has silvery white appearance, has no crack, is smooth and compact, and has strong bond with the base body.