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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2 citations
TL;DR: In this article, ternary NiWP alloy coatings were prepared by electrodeposition, and the effects of NaH2PO2 concentration on the properties of the coatings, including the deposition rate, current efficiency, composition, surface morphology, corrosion resistance, and microhardness, were investigated.
Abstract: In this paper, ternary NiWP alloy coatings were prepared by electrodeposition, and the effects of sodium hypophosphite (NaH2PO2) concentration on the properties of the coatings, including the deposition rate, current efficiency, composition, surface morphology, corrosion resistance, and microhardness, were investigated. Results reveal that the deposition rate and current efficiency are mainly dependent on the NaH2PO2 concentration in the plating bath. The deposition rate reaches a maximum value of 8.70 μm/h with a NaH2PO2 concentration of 10 g/L, whereas the total current efficiency decreases from 33.10 to 27.80%. As the concentration of NaH2PO2 increases, the grain size of the obtained coatings gradually decreases. Moreover, when the NaH2PO2 concentration is 6 g/L, the NiWP alloy coatings possess a microhardness value of 663.7 HV.
2 citations
Patent•
21 Jan 2009
TL;DR: In this paper, a preparation method and a plating solution for forming functional gradient composite plating is presented. But the preparation method is not suitable for high temperature and the plating process is not scalable.
Abstract: The invention provides a preparation method and a plating solution for forming functional gradient composite plating. By controlling the solid particle content of the plating solution in plating process, the preparation method ensures that solid particles in plating are distributed in a continuous gradient. The preparation method has the following concrete steps that: a workpiece is continuously plated in three or more than three plating solutions with different solid particle content, so as to ensure that the solid particles in the plating are distributed in the continuous gradient from a matrix to the surface of the plating; when plating is carried, the pH value is between 3.5 and 5.4, and the temperature is between 70 and 92 DEG C; and the components of the plating solution adopted by the preparation method for forming the functional gradient composite plating are: 15 to 40 grams of nickel sulfate per liter, 10 to 40 milliliters of lactic acid per liter, 1 to 10 milliliters of propionic acid per liter, 10 to 40 grams of sodium acetate per liter, 10 to 40 grams of sodium hypophosphite per liter, 0.1 to 5 milligrams of stabilizer per liter.
2 citations
01 Jan 2019
TL;DR: In this article, the influence of bath composition, which included nickel sulphate, sodium hypophosphite, and glycine on the deposition rate, coating roughness, and final coating microhardness with using of Taguchi techniqe was investigated.
Abstract: Electroless Ni-P coatings use in engineering applications due to its ability to alter and improve the surface properties of the steel substrate. The present study investigates the influence of bath composition, which included nickel sulphate, sodium hypophosphite, and glycine on the deposition rate, coating roughness, and final coating microhardness with using of Taguchi techniqe. The results reveal that final coating roughness and hardness can be optimized by controlling bath composition. The achieved minimum average surface roughness (Ra) was 80.7 nm and the highest coating hardness was 1145 HV.
2 citations
Patent•
16 Apr 1988
TL;DR: In this article, the authors describe a process for electroless chemically reductive deposition of ternary, nickel and phosphorus-containing alloys from aqueous, nickel ions and containing sodium hypophosphite or other reducing agent in the presence of organic compounds.
Abstract: The invention relates to a process for electroless chemically reductive deposition of ternary, nickel and phosphorus-containing alloys from aqueous, nickel ions and containing sodium hypophosphite or other reducing agent aqueous solutions in the presence of organic compounds, which is characterized ge that one metallic or nichtme-metallic materials after appropriate pretreatment ternary for depositing Ni-WP alloys lung at a pH value in the range from 4.5 to 9.5 immersed in an aq membered solution containing nickel ions, tungstate ions and sodium hypophosphite or other reducing agent and optionally buffer substances, or deposition of ternary Ni-Co-P alloys appeared at a pH in the range of 4.5 to 9.5 into an aqueous solution containing nickel ions, cobalt ions and sodium hypochlorite phosphite or other reducing agent and, where appropriate, buffer substances containing membered the respective aq solutions in addition organ to sets ic carboxylic acids as complexing agents, stabilizers and accelerators and, optionally, organic carboxylic acids or 8-hydroxyquinoline as a wetting agent and a brightener, and the materials then optionally heat treated.
2 citations