Establishing relationships between bath chemistry, electrodeposition and microstructure of Co–W alloy coatings produced from a gluconate bath

Weston, David; Harris, S.J.; Shipway, P.H.; Weston, Nicola; Yap, G.N.

doi:10.1016/j.electacta.2010.05.005

Cited by 82 publications

(33 citation statements)

References 38 publications

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“…Figure 2 shows the X-ray diffraction profiles obtained from electrodeposited pure Ni, Ni7at.%W, and Ni-15at.%W alloys. In the diffraction profile obtained from electrodeposited pure Ni, it is apparent that Ni (111) [23]. However, in the present work, the segregation of W atoms in the grain boundaries of electrodeposited Ni-15at.%W alloys were not observed.…”

contrasting

confidence: 45%

Isotropic magnetization response of electrodeposited nanocrystalline Ni–W alloy nanowire arrays

2013

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Isotropic magnetization response was demonstrated in electrodeposited nanocrystalline Ni-15%W alloy nanowire arrays, which can be applied to nanoscale magnetic field sensors. The Ni-W alloy nanowire arrays were electrochemically synthesized on a nanochannel template electrode from an aqueous electrolytic solution. X-ray and electron diffraction patterns revealed that Ni-15%W alloy deposits were composed of ultrafine crystal grains with a supersaturated solid solution phase. The magnetization of the Ni-15%W alloy thin films reached saturation at around 2.5 kOe in a perpendicular direction to the film plane, whereas the pure Ni thin films hardly magnetized in the perpendicular direction. On the contrary, Ni-15%W alloy nanowire arrays were easily magnetized, and reach saturation at around 1.0 kOe, even in a perpendicular direction to the array film plane that corresponds to the long axis direction of the alloy nanowires.

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contrasting

confidence: 45%

Isotropic magnetization response of electrodeposited nanocrystalline Ni–W alloy nanowire arrays

2013

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“…Weston et al . have used gluconate baths to electrodeposite Co−W coatings and extensively investigated different aspects of electrolyte formulations and plating conditions, microstructure, corrosion and wear behaviors . However, comprehensive X‐ray photoelectron spectroscopy (XPS) studies on the influence of different electrodeposition parameters such as pH, plating mode and bath composition lack in the literature.…”

Section: Introductionmentioning

confidence: 99%

Characterization and microhardness of Co−W coatings electrodeposited at different pH using gluconate bath: A comparative study

Bera

Seenivasan

Rajam

et al. 2013

Surface & Interface Analysis

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Electrodeposition of Co–W alloy coatings has been carried out with DC and PC using gluconate bath at different pH. These coatings are characterized for their structure, morphology and chemical composition by X‐ray diffraction, field emission scanning electron microscopy, differential scanning calorimetry and X‐ray photoelectron spectroscopy (XPS). Alloy coatings plated at pH8 are crystalline, whereas coatings electrodeposited at pH5 are nanocrystalline in nature. XPS studies have demonstrated that as‐deposited alloy plated at pH8 with DC contain only Co2+ and W6+ species, whereas that alloy plated at pH5 has significant amount of Co0 and W0 along with Co2+ and W6+ species. Again, Co2+ and W6+ are main species in all as‐deposited PC plated alloys in both pH. Co0 concentration increases upon successive sputtering of all alloy coatings. In contrast, mainly W6+ species is detected in the following layers of all alloys plated with PC. Alloys plated at pH5 show higher microhardness compared to their pH8 counterparts. Copyright © 2013 John Wiley & Sons, Ltd.

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“…The amorphous character of an electrodeposited coating is usually achieved by the codeposition of the elements of the iron group (Fe, Ni and Co) with an element, that can be a metal such as Mo and W or a metalloid such as P or B, which provokes defects in the crystal lattice of the coating, leading to the absence of a crystallographic structure in the electrodeposited coating. 8,10,12,[17][18][19][20][21][22] Among them, P is the more usual element to be codeposited with the elements of the iron group because it improves the corrosion-resistance properties of the electrodeposited coatings due to the fact that in aqueous medium this element produces a protective surface film formed by the phosphate anion, which kinetically limits the dissolution of the amorphous coatings such as Ni−P and Co−P electrodeposits. 22 Another important requirement to obtain amorphous electrodeposits is the composition of coating.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of electrodeposited and heat-treated Ni−Mo−P coatings

Melo¹,

Casciano²,

Correia³

et al. 2012

J. Braz. Chem. Soc.

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A eletrodeposição e as propriedades de dureza e resistência à corrosão de eletrodepósitos de Ni−Mo−P foram estudadas. A caracterização das camadas foi feita por microscopia eletrônica de varredura, difração de raios X e energia dispersiva de raios X. Os ensaios de corrosão foram feitos à temperatura ambiente em NaCl 10 -1 mol dm -3 e por polarização linear potenciodinâmica. Camadas amorfas de Ni−Mo−P foram obtidas e a composição destas mostrou ser dependente da composição do banho, da densidade de corrente aplicada e da temperatura do banho. A dureza das camadas de Ni−Mo−P mostrou ser dependente dos teores de Mo e P e que a ausência de trincas é um requerimento necessário para obter eletrodepósitos de Ni−Mo−P com boas propriedades de dureza. A dureza das camadas tratadas termicamente aumentou com a temperatura de tratamento térmico devido à precipitação das fases Ni, Ni 3 P e NiMo durante o tratamento térmico. A resistência à corrosão dos eletrodepósitos de Ni−Mo−P aumentou com o teor de P na camada. A camada Ni 78 Mo 10 P 12 apresentou os maiores valores de dureza a a maior resistência à corrosão. A adição de P mostrou ser benéfica para as propriedades de dureza e resistência à corrosão de eletrodepósitos de Ni−Mo.The electrodeposition, hardness and corrosion resistance properties of Ni−Mo−P coatings were investigated. Characterisations of the electrodeposited coatings were carried out using scanning electron microscopy, X-ray diffraction and energy dispersive X-ray analysis techniques. Corrosion tests were performed at room temperature in 10 -1 mol dm -3 NaCl solutions and by potentiodynamic linear polarisation. Amorphous Ni−Mo−P coatings were successfully obtained by electrodeposition using direct current. The coating composition showed to be dependent on the bath composition, current density and bath temperature. Both P and Mo contents contribute for the hardness properties of the Ni−Mo−P coatings and the absence of cracks is a requirement to produce electrodeposited Ni−Mo−P coatings with good hardness properties. The hardness values increase with heat-treatment temperature due to the precipitation of Ni, Ni 3 P and NiMo phases during the heat treatment. The corrosion resistance of the electrodeposited Ni−Mo−P amorphous coatings increases with P content in the layer. Among the electrodeposited Ni−Mo−P amorphous coatings, Ni 78 Mo 10 P 12 presented the best hardness and corrosion-resistance properties. The results showed that the addition of P is beneficial for the hardness and corrosion resistance properties of the Ni−Mo-based coatings.

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Establishing relationships between bath chemistry, electrodeposition and microstructure of Co–W alloy coatings produced from a gluconate bath

Cited by 82 publications

References 38 publications

Isotropic magnetization response of electrodeposited nanocrystalline Ni–W alloy nanowire arrays

Isotropic magnetization response of electrodeposited nanocrystalline Ni–W alloy nanowire arrays

Characterization and microhardness of Co−W coatings electrodeposited at different pH using gluconate bath: A comparative study

Characterisation of electrodeposited and heat-treated Ni−Mo−P coatings

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