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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TL;DR: In this paper, X-ray diffraction patterns and TEM analysis show that the alloy is amorphous and small oxide particles (5-20 nm) are dispersed in the amorphus structure.
Abstract: Iron-chromium-phosphorus (Fe–Cr–P) alloys were prepared by electrodeposition from an acidic citrate electrolyte using sodium hypophosphite as the source of phosphorus. These alloys form a passive oxide layer when exposed to air and are useful as protective coatings on steel. The current efficiency of the plating process reaches a maximum of 20% at a current density of 100 mA/cm2 where the alloy has 10% Cr and 19% P. X-ray diffraction patterns and TEM analysis show that the alloy is amorphous. TEM results also indicate that small oxide particles (5–20 nm) are dispersed in the amorphous structure. Besides Fe, Cr, and P, the alloys contain a low level of oxygen (4–7%) in the form of mixed iron and chromium oxides, as confirmed by AES analysis. When heated, the amorphous structure transforms into a mixture of Fe3P and Cr3P, along with α–Fe–Cr grains. This phase transformation occurs in the temperature range of 450–460 °C for alloys with 19% P.
12 citations
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21 Jan 2009
TL;DR: In this article, the authors provided a formulation of medium-temperature acidic electroless nickel-phosphorus alloy, which is characterized in that the formulation is as follows: 25 to 30 grams of nickel sulfate per liter, 25 to 35 grams of sodium hypophosphite per liter.
Abstract: The invention provides a formulation of medium-temperature acidic electroless nickel-phosphorus alloy, which is characterized in that the formulation is as follows: 25 to 30 grams of nickel sulfate per liter, 25 to 35 grams of sodium hypophosphite per liter, 12 to 18 grams of sodium acetate per liter, 05-13 milligrams of thiourea per liter, 7 to 13 milliliters of lactic acid per liter, 7 to 13 milliliters of acetic acid per liter, 4-10 grams of organic acid per liter, 5-16 milligrams of potassium iodide or potassium iodate per liter, and the loadage is between 05 and 15 dm /L The invention has the advantages that: the formulation improves the stability of a plating solution, obviously improves plating rate, has good corrosion resistance and the comprehensive properties of plating; the stability of the plating solution can reach over 1800 s; the stability of periodic experiments is more than ten periods; the corrosion resistance of the plating reaches over 130 s; and the hardness of the plating reaches 480 HV
12 citations
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11 Apr 2012
TL;DR: In this article, an electroplating pretreatment method for an acrylonitrile butadiene styrene (ABS) plastic surface was proposed, in which metal palladium activation is not used.
Abstract: The invention relates to an electroplating pretreatment method for an acrylonitrile butadiene styrene (ABS) plastic surface The electroplating pretreatment method comprises the following process steps of: eliminating stress, performing alkali washing for oil removal, pickling, roughening, performing neutralizing treatment, performing chemical activation, and performing the conventional electroplating, wherein in the chemical activation process, plastic base materials are put in to an activation solution and are subjected to hyperthermic treatment in a water bath for a certain period of time, each liter of the activation solution comprises 10 to 12g of nickel sulfate, 20 to 25g of sodium hypophosphite and 5 to 8g of sodium citrate, the pH is 9 to 11, and the temperature is between 70 and 75 DEG C In the invention, a novel method in which metal palladium activation is not used is provided, can be used for replacing a sodium borohydride and methanol activation process and contributes to environment friendliness; and on the basis of pretreatment, the plastic surface can be directly electroplated, so that the problems of complicated treating processes, high PdCl2 prices, high pollution possibility of a plating solution and the like are solved
12 citations
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TL;DR: In this paper, the effects of the amount of sodium hypophosphite, 1,2,3,4-butanetetracarboxylic acid and citric acid, curing temperature and curing time were examined.
Abstract: In this paper, the nonformaldehyde agent 1,2,3,4-butanetetracarboxylic acid was used for durable press finishing of silk fabric. To optimize the finishing, the effects of the amount of sodium hypophosphite, 1,2,3,4-butanetetracarboxylic acid and citric acid, curing temperature and curing time were examined. It was found that the wet wrinkle recovery angle had an obvious improvement from 179° to 273°, and that the finishing had a very small effect to the breaking strength.
12 citations
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26 Jul 1952TL;DR: A body consisting of molybdenum, titanium or zirconium or an alloy comprising at least 50 per cent thereof, is coated with a phosphide of at least one of the metals nickel and cobalt and heated in a non-oxidizing atmosphere to melt the coating and render it imperforate as discussed by the authors.
Abstract: A body consisting of molybdenum, titanium or zirconium or an alloy comprising at least 50 per cent thereof, is coated with a phosphide of at least one of the metals nickel and cobalt and heated in a non-oxidizing atmosphere to melt the coating and render it imperforate. The nickel or cobalt phosphide is said to be not a true compound with a fixed composition, but contains a major proportion, e.g. over 85 per cent of nickel or cobalt. Nickel phosphide may be prepared by reacting nickel (85 per cent) and phosphorus (15 per cent) and deposited on a body in an evacuated furnace chamber from a crucible heated to 1200 DEG C. Nickel phosphide may also be deposited by immersing the body in a solution of nickel chloride, ammonium chloride, sodium citrate, ammonium hydroxide and sodium hypophosphite. The coated body is heat-treated at a temperature from 600 to 1100 DEG C.
12 citations