Corrosion properties of electrodeposited nanocrystalline and amorphous patterned Ni–W alloy

Alimadadi, Hossein; Ahmadi, Majid; Aliofkhazraei, M.; Younesi, Reza

doi:10.1016/j.matdes.2008.06.036

Cited by 127 publications

(53 citation statements)

References 17 publications

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“…The composition of the Ni-W bath and the conditions of electrodeposition were selected similar to our previous work [12]. An electrolyte was prepared with pure 0.14 mol⋅L −1 nickel sulfate (NiSO 4 ⋅6H 2 O), 0.44 mol⋅L −1 tri-sodium citrate (Na 3 C 6 H 5 O 7 ) as the complexing agent, 0.1-0.3 mol⋅L −1 sodium tungstate (Na 2 WO 4 ⋅2H 2 O) with 0.01 g/L saccharin (C 7 H 5 NO 3 S), 0.01 g/L SDS (C 12 H 25 NaO 4 S) (MERCK analytical grade material), and 50 g/L multi-walled carbon nanotube (MWCNT or CNT in this paper) (with an average diameter of less than 90 nm and length of up to 20 µm and purchased from PlasmaChem Company (Germany)).…”

Section: Nanocomposite Layer Formationmentioning

confidence: 99%

Effect of the duty cycle of pulsed current on nanocomposite layers formed by pulsed electrodeposition

2010

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Nickel-tungsten/carbon nanotube nanocomposite layers with high content and uniform dispersion of carbon nanotubes were fabricated using pulsed electrodeposition technique. Nanocomposite layers were analyzed by scanning electron microscopy, atomic force microscopy, microhardness, and Tafel polarization tests. The effect of the duty cycle of pulsed current or concentration of carbon nanotubes in the metallic matrix on electrochemical and mechanical properties of obtained layers has been investigated. It has been shown that both the electrochemical and mechanical properties of nanocomposite layers that formed by pulsed current were improved significantly with respect to un-composed Ni-W layer. The results were not only concerned by the concentration of carbon nanotubes in the layer but also influenced by the distribution of nanoparticulates in the metallic matrix.

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Section: Nanocomposite Layer Formationmentioning

confidence: 99%

Effect of the duty cycle of pulsed current on nanocomposite layers formed by pulsed electrodeposition

2010

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“…Nowadays, many coating techniques have been used to produce tungsten coatings on graphite substrates, i.e., physical vapor deposition (PVD), chemical vapor deposition (CVD), plasma spray (PS), combined magnetron sputtering and ion implantation (CMSII) and electrodeposition [5][6][7]. Among these kinds of coating technologies, electrodeposition method has unique advantages to fabricate tungsten coatings due to its simplicity, low cost and the satisfied properties of the obtained tungsten coatings [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Properties of Electrodeposited Tungsten Coatings on Graphite Substrates for Plasma Facing Components

et al. 2016

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Tungsten coating on graphite substrate is considered as one of promising candidate materials of plasma facing components. In this study, tungsten coatings on graphite substrate were successfully prepared by direct current (DC) and pulse current (PC) electrodeposition methods in Na 2 WO 4 -WO 3 molten salt under the air atmosphere. Pores were found on the surfaces of the tungsten coatings produced by DC electrodeposition method. For the coatings fabricated by PC method, compact and smooth tungsten coatings were successfully obtained. The crystal structure, morphology, density, microhardness, adhesive strength, oxygen content and the thermal conductivity of the coatings fabricated by PC method were investigated. The obtained tungsten coatings had a body centered cubic structure. After electro-deposition for 100 h, the thickness of the tungsten coating reached 810.02 ± 10.40 lm and the oxygen content was 0.03 wt%. The thermal conductivity of the tungsten coating was 134.29 W m -1 K -1 . The density of the tungsten coating was 18.83 g cm -3 . The hardness of the coating was 492.0 ± 7.8 HV. After deuterium plasma irradiation, the tungsten coatings were prone to blistering.

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“…Ni-W alloys have been predicted to become the alternative materials in micro-mold injectors, computers, and polymeric components [8]. Because of their properties, these alloys have also been considered as an alternative to hard chromium plating [9]. The mechanism of the induced codeposition of tungsten in the nickel matrix from its ternary complex is well known [10].…”

Section: Introductionmentioning

confidence: 99%

Effect of benzaldehyde on the electrodeposition and corrosion properties of Ni–W alloys

Kumar

Kennady

2015

Int J Miner Metall Mater

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The effect of different concentrations of benzaldehyde on the electrodeposition of Ni-W alloy coatings on a mild steel substrate from a citrate electrolyte was investigated in this study. The electrolytic alkaline bath (pH 8.0) contained stoichiometric amounts of nickel sulfate, sodium tungstate, and trisodium citrate as precursors. The corrosion resistance of the Ni-W-alloy-coated specimens in 0.2 mol/L H 2 SO 4 was studied using various electrochemical techniques. Tafel polarization studies reveal that the alloy coatings obtained from the bath containing 50 ppm benzaldehyde exhibit a protection efficiency of 95.33%. The corrosion rate also decreases by 21.5 times compared with that of the blank. A higher charge-transfer resistance of 1159.40 Ω·cm 2 and a lower double-layer capacitance of 29.4 µF·cm −2 further confirm the better corrosion resistance of the alloy coating. X-ray diffraction studies reveal that the deposits on the mild steel surface are consisted of nanocrystals. A lower surface roughness value (R max ) of the deposits is confirmed by atomic force microscopy.

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Corrosion properties of electrodeposited nanocrystalline and amorphous patterned Ni–W alloy

Cited by 127 publications

References 17 publications

Effect of the duty cycle of pulsed current on nanocomposite layers formed by pulsed electrodeposition

Effect of the duty cycle of pulsed current on nanocomposite layers formed by pulsed electrodeposition

Properties of Electrodeposited Tungsten Coatings on Graphite Substrates for Plasma Facing Components

Effect of benzaldehyde on the electrodeposition and corrosion properties of Ni–W alloys

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