Excellent Properties of Ni-15 wt.% W Alloy Electrodeposited from a Low-Temperature Pyrophosphate System

Su, Changwei; Sa, Zhaoyao; Liu, Yangyang; Zhao, L.; Wu, Feifei; Bai, Wei

doi:10.3390/coatings11101262

Cited by 7 publications

(10 citation statements)

References 38 publications

(50 reference statements)

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“…In order to investigate the thermal stability of the A3 laser-generated nanostructures, the samples were thermally annealed in a furnace at 523 K, 723 K and 973 K for 60 min in argon atmosphere in order to reduce tape oxidation that takes place at temperatures above 773 K [ 46 ]. Figure 13 compares SEM micrographs of an initial tape surface where self-ordered A3 nanostructures were generated and their aspect after the different annealing cycles applied.…”

Section: Resultsmentioning

confidence: 99%

Highly Regular Hexagonally-Arranged Nanostructures on Ni-W Alloy Tapes upon Irradiation with Ultrashort UV Laser Pulses

et al. 2022

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Nickel tungsten alloy tapes (Ni—5 at% W, 10 mm wide, 80 µm thick, biaxially textured) used in second-generation high temperature superconductor (2G-HTS) technology were laser-processed in air with ultraviolet ps-laser pulses (355 nm wavelength, 300 ps pulse duration, 250–800 kHz pulse repetition frequency). By employing optimized surface scan-processing strategies, various laser-generated periodic surface structures were generated on the tapes. Particularly, distinct surface microstructures and nanostructures were formed. These included sub-wavelength-sized highly-regular hexagonally-arranged nano-protrusions, wavelength-sized line-grating-like laser-induced periodic surface structures (LIPSS, ripples), and larger irregular pyramidal microstructures. The induced surface morphology was characterized in depth by electron-based techniques, including scanning electron microscopy (SEM), electron back scatter diffraction (EBSD), cross-sectional transmission electron microscopy (STEM/TEM) and energy dispersive X-ray spectrometry (EDS). The in-depth EBSD crystallographic analyses indicated a significant impact of the material initial grain orientation on the type of surface nanostructure and microstructure formed upon laser irradiation. Special emphasis was laid on high-resolution material analysis of the hexagonally-arranged nano-protrusions. Their formation mechanism is discussed on the basis of the interplay between electromagnetic scattering effects followed by hydrodynamic matter re-organization after the laser exposure. The temperature stability of the hexagonally-arranged nano-protrusion was explored in post-irradiation thermal annealing experiments, in order to qualify their suitability in 2G-HTS fabrication technology with initial steps deposition temperatures in the range of 773–873 K.

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Section: Resultsmentioning

confidence: 99%

Highly Regular Hexagonally-Arranged Nanostructures on Ni-W Alloy Tapes upon Irradiation with Ultrashort UV Laser Pulses

et al. 2022

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“…The various particles co-deposited along with the Ni-based alloy during the electrodeposition process tend to reinforce the base alloy matrix with an enhanced hardness, corrosion resistance, wear and abrasion resistance, as compared to the as-plated Ni-alloy and, in turn prove to be a viable replacement for the various mechanical properties offered by the hard chrome coatings [3][4][5][6][7][8][9][10][11][12][13][14]. The reported studies demonstrate that the hardness for the as plated Ni-W alloy varies roughly from 450-750 Hv [15], while the hardness can be enhanced by the incorporation of certain particles, such as diamond, alumina, boron, tungsten carbide, silicon carbide and BN, up to a considerable extent.…”

Section: Introductionmentioning

confidence: 91%

Influence of Annealing on the Microstructure and Mechanical Properties of Ni-W/Boron Composite Coatings

et al. 2022

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Ni-W/boron composite coatings are deposited from an ammonia citrate bath with a boron particle suspension. The effect of the boron incorporation into the Ni-W alloy coating and subsequent heat treatment of the deposits on the microstructure and properties of the Ni-W/boron coatings have been investigated. The boron particles can be uniformly dispersed in the Ni-W alloy, which can lead to an enhancement in the wear performance and hardness of the coatings. The XRD results show that a new Ni4W phase can be formed, especially at heat treatment temperatures beyond 400 °C. The grain size of the deposits is smaller than 10 nm with heat treatment temperatures lower than 600 °C and increases with the heat treatment temperature increasing. The higher temperature will significantly cause the grain coarsening (25.8 nm at 700 °C). Furthermore, the hardness and wear resistance increase with the formation of the Ni4W phase and the inverse Hall–Petch relationship at the lower heat treatment temperatures (<600 °C). While the grain coarsening causes the hardness of the deposits to decrease at the temperature of 700 °C.

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“…As a non-cyanide complexant, pyrophosphate is not easily decomposed and consequently presents a longer lifespan. Ni-W crack-free coatings have been prepared from pyrophosphate baths [13,14].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of Textured Ni–W Coatings Electrodeposited on the Steel Surface from a Pyrophosphate Bath

Deng,

Li,

et al. 2023

Coatings

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Ni–W alloys with a (2 2 0) or (1 1 1) preferred orientation growth and amorphous structure were prepared from a pyrophosphate bath using the electrodeposition method. Structure transformation can be the result of the bath temperature (Tb) and the concentration of sodium tungstate (CW) in the bath. Increasing the Tb and CW can change the crystal growth from (2 2 0) to (1 1 1). At a higher Tb and CW, an amorphous Ni–W alloy can be obtained. The tungsten content in the coatings should be responsible for the structure change. The three textured Ni–W alloys with a (2 2 0) texture, (1 1 1) texture and amorphous structure were annealed at different temperatures ranging from 200 to 700 °C. The microhardness, corrosion resistance and HER of the as-deposited and annealed Ni–W alloys were comparatively studied. The results show that the microhardness of the amorphous Ni–W alloy is the highest and reaches 1028 HV after annealing at 400 °C. The (2 2 0)-textured Ni–W alloy has the best corrosion resistance, which is further improved after annealing, while the HER activity of the (1 1 1) textured Ni-W alloy is superior.

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Excellent Properties of Ni-15 wt.% W Alloy Electrodeposited from a Low-Temperature Pyrophosphate System

Cited by 7 publications

References 38 publications

Highly Regular Hexagonally-Arranged Nanostructures on Ni-W Alloy Tapes upon Irradiation with Ultrashort UV Laser Pulses

Highly Regular Hexagonally-Arranged Nanostructures on Ni-W Alloy Tapes upon Irradiation with Ultrashort UV Laser Pulses

Influence of Annealing on the Microstructure and Mechanical Properties of Ni-W/Boron Composite Coatings

Preparation and Properties of Textured Ni–W Coatings Electrodeposited on the Steel Surface from a Pyrophosphate Bath

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