Electrodeposition of Nickel-Tungsten Alloys from an Acid Plating Bath

Holt, M. L.; Nielsen, Mads

doi:10.1149/1.3071407

Cited by 6 publications

(2 citation statements)

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“…However, electrodeposition of these metals from nonaqueous media can be done 9 . Although pure metals of W, Mo and V have not been electrodeposited from aqueous media, electrodeposition of alloys of W and Mo with the iron group metals (Ni, Fe, Co) have been readily done for over 60 years 10,11 , IG-V binary and ternary magnetic thin film alloys by electrodeposition from aqueous solutions have been reported recently 12 .…”

Section: Introductionmentioning

confidence: 99%

Parametric Aqueous Electrodeposition Studies of Co-Sm Alloys

2006

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Electrodeposition of SmCo alloys from an aqueous solutions has been studied at various current densities, temperatures and bath compositions. Magnetic properties, such as both parallel and perpendicular coercivities, and magnetic saturation, have been measured. Higher bath temperatures lead to metallic deposits at higher current densities resulting in larger deposit Sm content. 33 at% Sm have been obtained at 500 mA/cm2 from bath temperatures of 60oC. The absence of the conducting salt (NH4 sulfamate) leads to higher deposit Sm content. XRD of these deposits shows the presence of Sm2Co17 (200) and SmCo5 (201) phases. Current efficiencies were below 20%. Magnetic saturation of SmCo electrodeposits were close to those obtained by sputtering. Heat treatment of the deposits should increase the perpendicular coercivities to the 2-10 kOe range.

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Section: Introductionmentioning

confidence: 99%

Parametric Aqueous Electrodeposition Studies of Co-Sm Alloys

2006

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“…Yet, W (and Mo) cannot be electrodeposited in a pure state from aqueous solutions; the presence of another metal is required for induced codeposition [8,21]. Tungsten codeposition with iron-group metals occurs far more readily than with other metals; hence, its codeposition with Ni, Fe and Co has been most widely studied since the 1930s [17,[21][22][23][24][25][26][27][28][29][30][31][32][33]. These alloys have been reported to have attractive mechanical, tribological, magnetic, electrical and electrochemical and corrosion resistance properties [9,[21][22][23][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Induced Codeposition of Tungsten with Zinc from Aqueous Citrate Electrolytes

Kazimierczak,

Eliaz

2023

Coatings

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Zinc–tungsten coatings have been considered as environmentally friendly, and corrosion- and wear-resistant coatings. Here, Zn–W coatings were successfully electrodeposited from an aqueous solution. Citrate-based electrolytes with pH in the range of 3.0 to 5.7 were used as plating baths. The kinetics of co-reduction in the Zn(II)–W(VI)–Cit system was studied on the basis of partial polarization curves. The effects of applied potential, electrolyte composition, pH, hydrodynamic conditions and passed charge on the electrodeposition of Zn–W layers were determined. X-ray photoelectron spectroscopy confirmed the presence of metallic tungsten co-deposited with zinc. X-ray diffraction analysis revealed the formation of hexagonal Zn–W phase resulting from a substitution of Zn atoms by W atoms in the Zn crystal lattice. The formation of the proper stable and electroactive W(VI) and Zn(II) complexes is the first crucial factor enabling the induced codeposition of Zn–W alloys. The tungsten content in the Zn–W deposit is closely related to the concentration of electroactive tungstate–citrate species and its ratio relative to the zinc–citrate electroactive species in the electrolytic bath. The oxidation state of tungsten in the electrodeposited Zn–W layers can be controlled mainly by the applied deposition potential and by the bath pH, which determines the type of W(VI)–Cit species that can be reduced.

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Effect of Carbon Nanotubes on Corrosion and Tribological Properties of Pulse-Electrodeposited Co-W Composite Coatings

Anand

Natarajan

2014

J. of Materi Eng and Perform

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Cobalt-Tungsten (Co-W) alloy coatings possessing high hardness and wear/corrosion resistance, due to their ecofriendly processing, have been of interest to the researchers owing to its various industrial applications in automobile, aerospace, and machine parts. This technical paper reports Co-W alloy coatings dispersed with multiwalled carbon nanotubes (MWCNTs) produced by pulse electrodeposition from aqueous bath involving cobalt sulfate, sodium tungstate, and citric acid on stainless steel substrate (SS316). Studies on surface morphology through SEM, microhardness by Vickers method, microwear by pin-on-disk method, and corrosion behavior through potentiodynamic polarization method for the Co-W-CNT coatings were reported. Characterization studies were done by SEM and EDX analysis. The results showed that the corrosion and tribological properties of the pulse-electrodeposited Co-W-CNT alloy coatings were greatly influenced by its morphology, microhardness, %W, and MWCNT content in the coatings.

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Electrodeposition of Nickel-Tungsten Alloys from an Acid Plating Bath

Cited by 6 publications

References 0 publications

Parametric Aqueous Electrodeposition Studies of Co-Sm Alloys

Parametric Aqueous Electrodeposition Studies of Co-Sm Alloys

Induced Codeposition of Tungsten with Zinc from Aqueous Citrate Electrolytes

Effect of Carbon Nanotubes on Corrosion and Tribological Properties of Pulse-Electrodeposited Co-W Composite Coatings

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