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Examining the effect of electrosynthesis conditions on the Ni-P alloy composition

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TLDR
In this article, the influence of electrolysis parameters on the Ni-P alloy composition, obtained from the methanesulfonate and sulfate electrolytes, has been examined and it is shown that an increase in the concentration of sodium hypophosphite, acidity and temperature of the electrolyte increases phosphorus content in the alloy.
Abstract
The Ni–P alloys are widely used as catalysts, magnetic and wear resistant materials. Properties of the nickel-phosphorous alloys are defined by the composition. A highly regulated technique to obtain the alloys with specified composition is the electrosynthesis. It is a relevant task to establish dependences of the alloy composition on the process conditions. In the present work we examined the influence of electrolysis parameters on the Ni–P alloy composition, obtained from the methanesulfonate and sulfate electrolytes. It is shown that an increase in the concentration of sodium hypophosphite, acidity and temperature of the electrolyte increases phosphorus content in the alloy. It was established that when carrying out the electrosynthesis under galvanostatic mode, a change in the alloy composition is predetermined by the rate of phosphorus formation. Atomic phosphorus is formed as a result of the course of two reactions. There occurs the electroreduction and disproportionation of hypophosphite-anion involving hydrogen ions. An increase in the concentration of hydrogen ions in the near-electrode layer contributes to an increase in the rate of phosphorus formation and growing phosphorus content in the alloy. That is why the alloys with a higher content of phosphorus are formed at lower pH indices of the electrolyte and at higher temperature. It was established that weak buffer properties of the methanesulfonate electrolyte are responsible for the lowered phosphorus content in the synthesized alloy. High pH index in the near-electrode layer reduces the rate of phosphorus formation. Established regularities might prove very useful when designing new technologies of the Ni–P alloy electrosynthesis of specified composition from the methanesulfonate electrolyte.

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Citations
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Journal ArticleDOI

Electrodeposition of Ni-P alloy coatings: a review

TL;DR: In this article, a general survey of research on the electrodeposition of Ni P binary alloy coatings is provided, as well as the key process variables influencing the phosphorus content of deposits and the roles of the major electrolytic bath constituents.

Contact fracture mechanism of electroplated Ni-P coating on stainless steel substrate

TL;DR: In this article, the contact fracture property and mechanism of electroplated Ni-P coating on stainless steel substrate were investigated using ball indentation testing, through a comprehensive experimental and numerical approach.
Posted Content

Ni-P coatings electroplating - A review, Part I: Pure Ni-P alloy

TL;DR: In this article, the authors provide a general survey of the research work dealing with the electrodeposition of Ni-P binary alloy coatings, including proposed phosphorus incorporation mechanisms, NiP alloy microstructure before and after thermal treatment, its mechanical, tribological, corrosion, catalytic and magnetic properties are considered, so are the key process variables influencing phosphorus content in the deposits and the main electrolytic bath constituents.
References
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Journal ArticleDOI

Pulse electrodeposition of Ni–P matrix composite coatings reinforced by SiC particles

TL;DR: In this paper, it was revealed that increased micron-SiC codeposition percentage resulted in decrease of P content in the amorphous matrix and increase of the deposits' hardness values.
Journal ArticleDOI

Electrodeposition of high corrosion resistance Cu/Ni–P coating on AZ91D magnesium alloy

TL;DR: In this paper, high corrosion resistance Cu/Ni-P coatings were electrodeposited on AZ91D magnesium alloy via suitable pretreatments, such as one-step acid pickling activation, once zinc immersion and environment-friendly electroplated copper as the protective under-layer, which made Ni-P deposit on AZ 91D Mg alloy in acid plating baths successfully.
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Electrochemical study on Ni–P electrodeposition☆

TL;DR: In this article, the kinetics of P incorporation during Ni-P electrodeposition were investigated by means of interfacial pH measurements, cathodic polarization curves and electrochemical impedance spectroscopy.
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Study of hydrogen evolution reaction on Ni–P amorphous alloy in the light of experimental and quantum chemistry

TL;DR: In this paper, the hydrogen evolution reaction (HER) on Ni-P alloys was investigated experimentally and theoretically and the best catalysis to the HER was found on the Ni-p alloys with P content of 6.0 wt% (10.8 at%).
Journal ArticleDOI

Electrochemical deposition and characterization of Ni-P alloy thin films

TL;DR: In this article, the effects of phosphorus concentration on the crystal structure, composition and morphology of Ni-P alloy thin films were studied and discussed, and the effect of high phosphorus concentrations on crystal structure and composition was discussed.
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