Effect of phosphorus on magnetic property of Ni–P alloy synthesized using pulsed electrodeposition

Dhanapal, K.; Narayanan, Vijaykrishnan; Stephen, A.

doi:10.1016/j.matchemphys.2015.09.039

Cited by 41 publications

(14 citation statements)

References 36 publications

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“…3, b, d, e) it shows a fissured area of the Ni-P deposit coatings. This fissured area may be attributed to the internal stresses caused by the hydrogen reaction intensification, it is noted that the morphology of these coatings is similar to those obtained by T. Mahalingam and K. Dhanapal [16,17].…”

Section: Surface Morphologysupporting

confidence: 78%

“…The physical and mechanical properties of the coatings can be modified within a certain range using the opportunity to work generally at ambient temperature, the uniform, and controllable deposition rate, the possibility to form multilayer, the ability to coat large surfaces in almost any shape and geometry, and the low cost [2][3][4]. Ni-P coatings can be deposited effectively on steel [5,6], aluminium alloys [7], copper [8][9][10][11]. The electrodeposition process plays a crucial role in the formation of thin films on materials, occurring through the electrochemical reduction of metal ions in the electrolytic solutions.…”

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confidence: 99%

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Effects of Current Density on Ni–P Coating Obtained by Electrodeposition

Lekmine¹,

Digheche²,

Naoun³

et al. 2021

Metallofiz. Noveishie Tekhnol.

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In this work, Ni-P coatings are deposited on the steel substrate by electrodeposition from a solution containing nickel sulfate and sodium hypophosphite (NaH 2 PO 2 ). The effect of the current density on the morphology, phase structure, microhardness, and corrosion performance of the Ni-P coatings are studied. Scanning electron microscopy and energy dispersive X-ray analysis and X-ray diffraction are used to study the morphological, composition and phase structure. The corrosion performance of the coatings is evaluated by weight loss, electrochemical impedance spectroscopy and Tafel polarization. Results showed that the morphology of the electrodeposited Ni-P alloys coatings has spherical grains for all the samples, and the Ni 3 P phases are formed all over the microstructure of the coatings. It is observed that the phosphorus content and microhardness are dependent on the current density. The corrosion tests show that 5 A⋅dm −2 current density is the optimal value which gives the best protective coating against corrosion. It also exhibits superior microhardness originated from the higher Ni 3 P amount.

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Section: Surface Morphologysupporting

confidence: 78%

mentioning

confidence: 99%

Effects of Current Density on Ni–P Coating Obtained by Electrodeposition

Lekmine¹,

Digheche²,

Naoun³

et al. 2021

Metallofiz. Noveishie Tekhnol.

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“…The precipitations were indexed to be body-centered tetragonal structured Ni 3 P according to the HRTEM image in Figure 3 b. Annealing for 4 h resulted in a larger volume fraction of Ni 3 P (volume fraction of ~15% with average grain size of ~40 ± 10 nm), as shown in Figure 3 c. Although a large amount of Ni 3 P was precipitated after a longer annealing time, the saturation magnetization of Ni-7.1%P alloy was not significantly changed. The saturation magnetization was in agreement with the same P content after annealing at 400 °C with a large amount of Ni 3 P [ 36 ]. As revealed in Figure 3 d, the saturation magnetization value only increased from 14.05 A·m 2 /kg after being annealed for 0.5 h, to 15.66 A·m 2 /kg after being annealed for 4 h, confirming that the second phase Ni 3 P had little effect on the improved saturation magnetization in the present NC Ni-P alloys.…”

Section: Resultsmentioning

confidence: 56%

Simultaneous Enhancement of Mechanical and Magnetic Properties in Extremely-Fine Nanograined Ni-P Alloys

Zhu

et al. 2018

Nanomaterials

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Exploring structural effects that influence both the mechanics and magnetism in nanocrystalline materials, particularly extremely-fine nanograined ones with grain sizes down to several nanometers, is of high interest for developing multifunctional materials combining superior mechanical and magnetic performances. We found in this work that electrodeposited extremely-fine nanograined Ni-P alloys exhibit a significant enhancement of magnetization, simultaneously along with an increase in hardness, after low-temperature annealing. The relaxation of non-equilibrium structures, precipitation of the second phase and the segregation of P atoms to grain boundaries (GBs) during annealing have then been sequentially evidenced. By systematically comparing the variations in macroscopic and microstructural investigation results among several Ni-P alloys with different P contents, we suggest that the second phase has little effect on magnetization enhancement, and essentially both the structural relaxation and GB segregation can play important roles in hardening by governing GB stability, and in the improvement of magnetization by enhancing Ni–Ni atom exchange interactions.

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“…I is the applied current (A), t is the deposition duration (s), and F is the Faraday's constant (96,485 coulombs). 37,38 Selected samples were annealed at 400°C with a heating rate of 10°C min −1 for 1 h in air to study the effect of heat treatment on their microhardness.…”

Section: Sample Preparation and Electrodepositionmentioning

confidence: 99%

Study of the effect of pulse plating parameters on the electrodeposition of NiP and NiP/SiC coatings and their microhardness values

Ahmadkhaniha

Tsongas

Tzetzis

et al. 2021

Transactions of the IMF

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This study is focused on finding optimised conditions for electrodeposition of NiP and NiP/SiC coatings, which enhance the coatings' microhardness. Both the effect of particles and the effect of heat treatment at 400°C for 1 h on the microhardness of the coating were studied. The effects of pulse electrodeposition parameters including duty cycle, frequency, and peak current density on the composition of NiP and NiP/SiC composite coatings were examined, and the results were compared with those from direct current plating. Pulse plating increased the current efficiency of NiP deposition while decreasing the phosphorus content of these coatings in comparison to direct plating, resulting in higher microhardness values. It was also shown that wt.%P in NiP coating depends not only on peak current density but also on bath charge of pulse plating. Pulse plating parameters (duty cycle and frequency) and the low incorporation of SiC particles did not affect microstructure or the microhardness of the coatings, while heat treatment was the main factor that increased microhardness.

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Effect of phosphorus on magnetic property of Ni–P alloy synthesized using pulsed electrodeposition

Cited by 41 publications

References 36 publications

Effects of Current Density on Ni–P Coating Obtained by Electrodeposition

Effects of Current Density on Ni–P Coating Obtained by Electrodeposition

Simultaneous Enhancement of Mechanical and Magnetic Properties in Extremely-Fine Nanograined Ni-P Alloys

Study of the effect of pulse plating parameters on the electrodeposition of NiP and NiP/SiC coatings and their microhardness values

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