Comparison of the Structure and Chemical Composition of Crystalline and Amorphous Electroless Ni-W-P Coatings

Valova, E.; Armyanov, S.; Franquet, Alexis; Petrov, Κ.; Kovacheva, D.; Dille, Jean; Delplancke, Jean‐Luc; Hubin, Annick; Steenhaut, Oscar; Vereecken, Jean

doi:10.1149/1.1705661

Cited by 27 publications

(16 citation statements)

References 26 publications

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“…3), which matches up with selected diffraction peaks of nickel powder. Valova et al [14] have reported similar findings that NiWP possesses almost identical diffraction peaks as nickel. According to the diffraction pattern shown in Fig.…”

Section: Article In Pressmentioning

confidence: 57%

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Fabrication of magnetic nickel–tungsten–phosphorus particles by electroless deposition

Chang

Chen

2006

Journal of Magnetism and Magnetic Materials

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Section: Article In Pressmentioning

confidence: 57%

“…However, there are only few reports available in open literature discussing physicochemical properties of bulky NiWP deposits [7,[11][12][13][14]. None of them has embraced the magnetic properties of NiWP particles in submicron and nanometer scale.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of magnetic nickel–tungsten–phosphorus particles by electroless deposition

Chang

Chen

2006

Journal of Magnetism and Magnetic Materials

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“…Recent researches show that the presence of phosphorus in iron alloys influences on tribological properties and its corrosion resistance [12]. The amorphous Ni-W-P alloy with high strength properties was obtained [13,14]. Introduction of phosphorous into the alloys, for example Co-W, eliminates the cracks even at higher current densities applied for electrodeposition [15].…”

Section: Introductionmentioning

confidence: 99%

Tribological and Corrosion Properties of Iron-Based Alloys

Vernickaite

Antar

Nicolenco

et al. 2015

Proceedings of the 8th International Scientific Conference "BALTTRIB 2015"

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Corrosion is responsible for industrial maintenance and industrial accidents costs. A helpful way to prevent corrosion is to develop advanced materials with highly anti-corrosive properties. The electrodeposition is one of the most attractive methods for obtaining these materials. This work deals with evaluation of the tribological and corrosion behaviour of electrodeposited Fe-W and Fe-W-P alloys. Electrodeposits were obtained from 4 different baths and were characterized by means of scanning electron microscopy; X-ray dispersive energy spectroscopy; X-ray diffraction spectroscopy. The hardness was determined by Micro-indentation carried out at normal forces varying from 98 mN up to 980 mN with a loading rate of 1961 mN/min. A ball-disc tribometer was used to study the tribological properties at 90 °C. A diamond indenter, having a radius of 100 µm, was used to carry the scratch test. Corrosion behaviour was studied using polarization and electrochemical impedance spectroscopy technique. It was investigated that in all cases Fe-W and Fe-W-P alloy coatings exhibit greater micro-hardness than the stainless steel substrate. The amorphous-like ternary Fe-W-P alloy coatings demonstrate higher wear and corrosion resistance and lower friction coefficient compared to binary Fe-W alloy coating.

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“…[25][26][27] This suggests that the codeposition of Re is possibly going in two different ways. One of them is probably similar to the cases mentioned above: the reduction of Re ions proceeds on the surface of the nanograins during the film growth.…”

Section: D454mentioning

confidence: 99%

Electroless Deposited Co–Re–P and Co–Re–Ni–P Coatings: Elemental State of the Alloy Components and Their Localization

Valova

Armyanov

Dille

et al. 2008

J. Electrochem. Soc.

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The effect of Re on the composition distribution and structure of Co-Re-P and Co-Re-Ni-P electroless coatings is studied. The participation of disproportionation reactions during perrhenate reduction to the elemental state, coupled with the two-electron reduction of Re͑VII͒ to Re͑VI͒ by hypophosphite, is proposed as an explanation for the mechanism of Re codeposition. This also gives an explication of the increased efficiency of hypophosphite in the presence of perrhenate, and the observed extremely low P percentage in the coatings. The deposits have a hexagonal close-packed ͑hcp͒ lattice with a texture ͗1010͘. Uniform cross sections of the films, prepared by the focused ion beam technique, are used to characterize the nanocrystalline columnar structure in relation to the composition distribution by applying high-resolution analytical electron microscopy. Besides the partial localization of Re at the grain boundaries, it is alloyed with Co and Ni within the crystalline grains. This could be considered as evidence of two possible ways of Re inclusion in the alloys. The parameters of the hcp lattice increase with the Re content in the alloys. The impact of Re and its distribution in the nanocrystalline structure on the magnetic properties of the coatings is demonstrated.During the last two decades of the 20th century, Co-Ni-Re-Pbased alloys have been intensively investigated because of their possible application as perpendicular recording media. 1-7 The search logically started in the direction of the improvement of electroless deposited Co-P with fiber texture ͗0001͘. Ni has been added to reduce the magnetization, and Mn to enhance the ͗0001͘ texture. 1-3 Later, the addition of Re to a Co-Ni-Mn-P alloy ensured further diminution of the magnetization. 4-6 In addition, Re having a hexagonal close-packed ͑hcp͒ lattice should increase the Co-Ni concentration interval with the hcp structure.Using a selective chemical etching method, it has been clarified that electroless deposited Co 32 -Ni 55 -Re 6 -P 7 films have a segregated structure: Co-rich, ferromagnetic parts with a high crystallinity are dispersed in a Ni-P-based nonmagnetic medium with a low crystallinity. 7 The segregation occurs from the nucleation stage and is preserved during the film growth up to 200 nm. Above this thickness, the film consists of highly crystallized particles with a mean diameter of 20 nm, forming a columnar structure, which is segregated in the nonmagnetic region with a low crystallinity. The microstructure of this nonmagnetic matrix is stable to heat-treatment of up to 500°C. 7 The expanding of the interplanar spacing of hcp ͑0001͒ planes has only been observed for Re codeposition, owing to the large diameter of the Re atom in contrast with the diameters of Ni and P. A linear increase of this spacing with Re content has been found. 8,9 Recently, the research interest has been raised in corrosion protective and barrier properties of Ni-P and Co-P-based alloys with refractory metals including Re, and their electroless deposition regained...

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Comparison of the Structure and Chemical Composition of Crystalline and Amorphous Electroless Ni-W-P Coatings

Cited by 27 publications

References 26 publications

Fabrication of magnetic nickel–tungsten–phosphorus particles by electroless deposition

Fabrication of magnetic nickel–tungsten–phosphorus particles by electroless deposition

Tribological and Corrosion Properties of Iron-Based Alloys

Electroless Deposited Co–Re–P and Co–Re–Ni–P Coatings: Elemental State of the Alloy Components and Their Localization

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