scholarly journals Reuse of Expired Cefort Drug in Nickel Electrodeposition From Watts Bath

2017 ◽  
Vol 12 (1) ◽  
pp. 87-94 ◽  
Author(s):  
Delia-Andrada Duca ◽  
Mircea Laurentiu Dan ◽  
Nicolae Vaszilcsin
Keyword(s):  
Nickel Electrodeposition ◽  
Watts Bath

Nickel Electrodeposition over Powder Compact for Irradiation Target

2012 ◽  
Vol 727-728 ◽  
pp. 14-19
Author(s):  
Adonis M. Saliba-Silva ◽  
R.H.L. Garcia ◽  
I.C. Martins ◽  
E.F. Urano de Carvalho ◽  
M. Durazzo
Keyword(s):  
Electrical Resistance ◽  
Powder Compact ◽  
Nuclear Reactors ◽  
Nickel Layer ◽  
Planar Layer ◽  
Current Frequency ◽  
Physical Strength ◽  
Nickel Electrodeposition ◽  
Watts Bath ◽  
Enriched Uranium

rradiation targets with 20% of 235U (Low Enriched Uranium - LEU) have been studied to replace HEU (Highly Enriched Uranium) targets in future nuclear reactors. These are used to produce the pair of radionuclides 99Mo / 99mTc, used for diagnostics in nuclear medicine. This work aims to develop an alternative route to produce LEU targets. It consists in hydrogenating and powdering metallic uranium and compacting the produced powder, followed by sealing it with nickel by electrodeposition. The deposited nickel should suppress the release of fission gases, and avoid a reactive contact of uranium with aluminum from the enclosure. In order to obtain the best conditions for deposition over uranium, in this work iron powder was compacted into small discs, with a diameter of 22mm and weight of 14g, simulating an equivalent volume of 10g of LEU uranium powder. As well, aluminum discs were used to ensure adhesion and uniformity of the nickel layer. Pulsed nickel electrodeposition was carried out over the compacts, employing current frequency of 900Hz, -0.84A/cm2 of peak current and duty cycle of 0.5 in Watts Bath. The electrical resistance of pulse Ni-plated layer was checked by experiments with impedance spectroscopy in plated samples using aluminum substrate, held in KCl (pH=6), giving EIS results after resting the discs in solution for 0h, 4h and 24h. The physical strength was evaluated qualitatively by treating the Ni covered compact at 600°C, developing a bump deformation on the original planar layer, up to the point to open the Ni-layer for gas relief. These results suggest an adequate mechanical strength of the Ni-layer for using under neutronic irradiation, sealing the radioactive gases, mainly 140Xe, produced during fission of 235U.

Effect of a Natural Brightener, Daphne gnidium L. on the Quality of Nickel Electroplating from Watts Bath

2016 ◽  
Vol 19 (2) ◽  
pp. 097-102 ◽  
Author(s):  
H. Belbah ◽  
H. Amira-Guebailia ◽  
A. M. Affoune ◽  
I. Djaghout ◽  
O. Houache ◽  
...  
Keyword(s):  
Nickel Electrodeposition ◽  
Daphne Gnidium ◽  
Naturally Occurring ◽  
Micro Cracks ◽  
Watts Bath ◽  
Nickel Deposits ◽  
Nickel Electroplating ◽  
Direct Immersion

Daphne gnidium L. (DGL), a plant known to be rich source of polyphenols, a naturally occurring class of antioxidants, was tested for its ability to play the role of primary and secondary brighteners for electrodeposition of nickel, as a replacement for synthetic brighteners such as glycerol and formaldehyde. A simple and convenient approach was adapted consisting in adding an accurate amount of powdered leaves of Daphne gnidium L. (DGLP) or Daphne gnidium L. leaves extract (DGLE), to the Watts bath, to play the role of brightening agents. Cyclic voltammetry studies revealed that DGLP could inhibit the reaction of nickel reduction and improve the quality of the deposits as efficiently as glycerol and formaldehyde. SEM analyses showed that the micro-cracks decreased and sometimes disappeared from nickel deposits prepared in the presence of DGLP as a brightener. The results of this study show that DGL can be used satisfactorily, with minimum operations as a brightening agent for nickel electrodeposition. The key idea of direct immersion of DGLP in the Watts bath, aimed to the replacement of synthetic brighteners and the reduction of the overall cost of nickel electrodeposition.

Influence of the Zinc Sublayer Method Production and Heat Treatment on the Microhardness of the Composite Ni-Al2O3 Coating Deposited on the 5754 Aluminium Alloy

2014 ◽  
Vol 59 (1) ◽  
pp. 355-358
Author(s):  
M. Karaś ◽  
M. Nowak ◽  
M. Opyrchał ◽  
M. Bigaj ◽  
A. Najder
Keyword(s):  
Heat Treatment ◽  
Aluminium Alloy ◽  
Thermal Shock ◽  
Nickel Coating ◽  
Nickel Sulphate ◽  
Al2o3 Coating ◽  
Nickel Coatings ◽  
Watts Bath ◽  
Before And After ◽  
Zinc Interlayer

Abstract In this study, the effect of zinc interlayer on the adhesion of nickel coatings reinforced with micrometric Al2O3 particles was examined. Nickel coating was applied by electroplating on EN AW - 5754 aluminium alloy using Watts bath at a concentration of 150 g/l of nickel sulphate with the addition of 50 g/l of Al2O3. The influence of zinc intermediate coating deposited in single, double and triple layers on the adhesion of nickel coating to aluminium substrate was also studied. The adhesion was measured by the thermal shock technique in accordance with PN-EN ISO 2819. The microhardness of nickel coating before and after heat treatment was additionally tested. It was observed that the number of zinc interlayers applied does not significantly affect the adhesion of nickel which is determined by thermal shock. No defect that occurs after the test, such as delamination, blistering or peeling of the coating was registered. Microhardness of the nickel coatings depends on the heat treatment and the amount of zinc in the interlayer. For both single and double zinc interlayer, the microhardness of the nickel coating containing Al2O3 particles increased after heat treatment, but decreased when a triple zinc interlayer was applied.

Preparation of Electrodeposited Ni-CNTs Nanocomposite Coatings with Highly Wear and Corrosion Resistance Properties

2012 ◽  
Vol 548 ◽  
pp. 101-104 ◽  
Author(s):  
W. Shao ◽  
D. Nabb ◽  
N. Renevier ◽  
I. Sherrington ◽  
J.K. Luo
Keyword(s):  
Mechanical Property ◽  
Carbon Nanotubes ◽  
Corrosion Resistance ◽  
Surface Morphology ◽  
Corrosion Property ◽  
Nanocomposite Coatings ◽  
Sem Images ◽  
Wear And Corrosion ◽  
Watts Bath ◽  
Wear And Corrosion Resistance

Ni-carbon nanotubes nanocomposite coatings were obtained from a Watts bath containing uniformly dispersed carbon nanotubes (CNTs). The surface morphology was investigated by the SEM images of coatings. The mechanical property and corrosion resistance of the nanocomposite coatings were investigated. This study revealed these CNTs reinforced Ni nanocoatings have improved mechanical and corrosion property.

Direct nickel electrodeposition on magnesium alloy in pyrophosphate electrolyte

2011 ◽  
Vol 205 (16) ◽  
pp. 4018-4023 ◽  
Author(s):  
Junghoon Lee ◽  
Wonsub Chung ◽  
Uoochang Jung ◽  
Yonghwan Kim
Keyword(s):  
Magnesium Alloy ◽  
Nickel Electrodeposition

Surface modification of spherical NdFeB magnetic powders by a fluid-bed nickel electrodeposition

2008 ◽  
Vol 62 (28) ◽  
pp. 4407-4409 ◽  
Author(s):  
Jingwu Zheng ◽  
Meiyan Jiang ◽  
Liang Qiao ◽  
Jiawei Sheng ◽  
Juan Li ◽  
...  
Keyword(s):  
Surface Modification ◽  
Nickel Electrodeposition ◽  
Fluid Bed
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