Preparation of Ni-Co Alloy by Electrodeposition

2014 ◽  
Vol 525 ◽  
pp. 58-61
Author(s):  
Yusrini Marita ◽  
Ridwan ◽  
Satri Nanda ◽  
Nurdin
Keyword(s):  
Current Density ◽  
Low Cost ◽  
Alloy Coating ◽  
Grain Structure ◽  
Cobalt Alloy ◽  
Nickel Cobalt ◽  
Structure Morphology ◽  
Ni Alloy ◽  
Current Densities ◽  
Composition Structure

Nickel-cobalt alloy coatings were prepared on copper substrates by electrochemical deposition at various deposition current densities of 10, 20, 30, 40 and 50 mA cm-2. Ni-Co alloy coating have been prepared by elecrodeposition technique due its low cost, easily maintainable equipment, easy control of film thickness and the method is also environmentally friendly. The effect of current density on deposit composition, structure, morphology and microhardness of electrodeposited Co-Ni alloy deposits were studied and discussed. The values of the current efficiency obtained are in the range of 68 95 %. From surface morphology obtained the current density increasing promotes the formation colony structure. Increasing the current density led to finer grain structure in Ni-Co deposit. The microhardness of electrodeposited Ni-Co coatings are in the range 482-610 HV.

Super-hydrophobic nickel–cobalt alloy coating with micro-nano flower-like structure

2015 ◽  
Vol 273 ◽  
pp. 638-646 ◽  
Author(s):  
S. Khorsand ◽  
K. Raeissi ◽  
F. Ashrafizadeh ◽  
M.A. Arenas
Keyword(s):  
Alloy Coating ◽  
Cobalt Alloy ◽  
Nickel Cobalt

scholarly journals Novel, Simple and Low-Cost Preparation of Ba-Modified TiO2 Nanotubes for Diclofenac Degradation under UV/Vis Radiation

Nanomaterials ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2714
Author(s):  
Mario Bohač ◽  
Tihana Čižmar ◽  
Vedran Kojić ◽  
Jan Marčec ◽  
Krunoslav Juraić ◽  
...  
Keyword(s):  
Tio2 Nanotubes ◽  
Low Cost ◽  
Electrochemical Anodization ◽  
Oh Radicals ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure Morphology ◽  
Titanium Thin Films ◽  
Current Densities ◽  
Photogenerated Charge Separation

A novel low-cost synthesis of barium-modified TiO2 nanotube (TNT) arrays was used to obtain an immobilized photocatalyst for degradation of diclofenac. TNT arrays were prepared by electrochemical anodization of titanium thin films deposited on fluorine-doped tin oxide (FTO) coated glass by magnetron sputtering, ensuring transparency and immobilization of the nanotubes. The Ba-modifications were obtained by annealing solutions of Ba(OH)2 spin coated on top of TNT. Three different concentrations of Ba(OH)2 were used (12.5 mM, 25 mM and 50 mM). The crystalline structure, morphology and presence of Ba were characterized by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy, respectively. Ba-modified TiO2 nanotubes (BTNT) were tested for photocatalytic degradation of diclofenac under UV/Vis radiation and it was proven that all of the Ba-modified samples showed an increase in photocatalytic activity with respect to the unmodified TNTs. The most efficient photocatalyst was the sample prepared with 25 mM Ba(OH)2 which showed 90% diclofenac degradation after 60 min. This result was in agreement with cyclic voltammetry measurements that showed the largest increase in photo-oxidation current densities for the same sample due to the increased generation of •OH radicals obtained by a more efficient photogenerated charge separation.

High-Jc YBCO coatings on reel-to-reel dip-coated Gd2O3 seed buffer layers epitaxially fabricated on biaxially textured Ni and Ni-(3at%W-1.7at%Fe) alloy tapes

2001 ◽  
Vol 689 ◽  
Author(s):  
Tolga Aytug ◽  
M. Paranthaman ◽  
S. Sathyamurthy ◽  
B. W. Kang ◽  
D. B. Beach ◽  
...  
Keyword(s):  
Low Cost ◽  
Dip Coating ◽  
Buffer Layers ◽  
Ex Situ ◽  
X Ray Diffraction ◽  
Ybco Films ◽  
Ni Alloy ◽  
Current Densities ◽  
Alloy Metal

ABSTRACTA low-cost, non-vacuum reel-to reel dip-coating system has been used to continuously fabricate epitaxial Gd2O3 buffer layers on mechanically strengthened, biaxially textured Ni- (3at.%W-1.7at%Fe), defined as Ni-alloy, metal tapes. X-ray diffraction analysis of the seed Gd2O3 layers indicated that well textured films can be obtained at processing temperatures (Tp) between 1100 and 1175°C. Processing speed did not significantly affect the crystalline quality of the Gd2O3. Scanning electron microscopy revealed a continuous, dense and crack-free surface morphology for these dip-coated buffers. The Gd2O3 layer thickness led to remarkable differences in the growth characteristics of the subsequent YSZ and CeO2 layers deposited by rfmagnetron sputtering. Epitaxial YBCO films grown by pulsed laser deposition on the short prototype CeO2/YSZ/Gd2O3/Ni-(3at%W-1.7at%Fe) conductors yielded self-field critical current densities (Jc) as high as 1.2×106 A/cm2 at 77 K. Pure Ni tapes were used to asses the viability of dip-coated buffers for long length coated conductor fabrication. The YBCO films, grown on 80 cm long and 1 cm wide CeO2/YSZ/Gd2O3 buffered Ni tapes by the industrially scalable ex-situ BaF2 precursor process, exhibited end-to-end self-field Jc of 6.25×105 A/cm2 at 77 K.

scholarly journals Effect of Current Density on the Wear Resistance of Ni–P Alloy Coating Prepared through Immersion-Assisted Jet-Electrodeposition

Coatings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 527
Author(s):  
Jieyu Xian ◽  
Zhenyu Shen ◽  
Zhengwei Zhang ◽  
Hongbin Wu ◽  
Meifu Jin ◽  
...  
Keyword(s):  
Grain Size ◽  
Wear Resistance ◽  
Surface Quality ◽  
Current Density ◽  
Coating Thickness ◽  
Cell Structure ◽  
Alloy Coating ◽  
Ni Content ◽  
Jet Electrodeposition ◽  
Composition Structure

To improve the wear resistance of 45 steel surfaces, a Ni−P alloy coating was prepared on the surface of 45 steel with an immersion-assisted jet-electrodeposition technology. Scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction and confocal microscopy were used in testing the surface morphology, composition, structure, grain size, and wear scar parameters of the coating. The effect of immersion-assisted jet-electrodeposition on the wear resistance of Ni−P alloy coating at current densities of 20–60 A·cm−2 were explored and analyzed. Results showed that the surface quality, microhardness, and wear resistance of Ni−P alloy coatings prepared through immersion-assisted jet-electrodeposition were improved compared with those of the coatings prepared through traditional jet-electrodeposition. With the increase in the current density, the surface cell structure of the alloy coating was refined, the flatness was improved, the surface Ni content was increased, the grain size was refined, and the coating thickness, the microhardness, and wear resistance showed a trend of first increasing and then decreasing. The best surface quality of the coating was observed at a current density of 50 A·cm−2. Moreover, the unit cell structure was obvious, the surface was flat and dense, the coating thickness was the largest, reaching 21.42 μm, the highest Ni content was obtained (98.25 wt.%), the smallest grain size (6.6 nm) was obtained, the microhardness of the coating reached a maximum value (725.58 HV0.1), and the best wear resistance was observed.

scholarly journals Effects of bath composition and current density on the electrodeposition of Fe-Ni alloy on copper substrate and the property of deposited alloy

2013 ◽  
Vol 47 (4) ◽  
pp. 379-386
Author(s):  
Md. Moniruzzaman ◽  
Md. Aminul Islam
Keyword(s):  
Current Density ◽  
Copper Substrate ◽  
Alloy Coating ◽  
Coarse Grained ◽  
Constant Current ◽  
Constant Current Density ◽  
Alloy Electrodeposition ◽  
Current Density Range ◽  
Ni Alloy ◽  
Anomalous Nature

One simple and six complex baths are used to electrodeposit Fe-Ni alloy coating on copper substrate. All baths contain the same 1.04 Ni/Fe ratio. In addition to NiSO4.7H2O, FeSO4.7H2O, H3BO3 used in simple bath, the complex baths contain Ascorbic acid, Saccharin and Citric acid in different ratios. Electrodepositions have been carried out in the bath pH and constant current density range of 1 - 2.6 and 20 - 140 mA/cm2, respectively. Anomalous nature of Fe-Ni alloy electrodeposition is suppressed in the complex baths. Microhardness as well as corrosion resistance of coating increased with increasing %Ni content in the deposit. The morphology of the Fe-Ni films obtained from simple baths is characterized by coarse-grained, non-smooth surface with presence of microcracks onto it. Coatings from complex baths are finegrained with smooth surfaces. Bangladesh J. Sci. Ind. Res. 47(4), 379-386, 2012 DOI: http://dx.doi.org/10.3329/bjsir.v47i4.8699

Preparation and Characterization of High-Density Li0.99W0.01FePO4/C Composite Cathodes

2012 ◽  
Vol 554-556 ◽  
pp. 399-403
Author(s):  
Mei E Zhong
Keyword(s):  
Low Cost ◽  
Specific Capacity ◽  
Rate Capability ◽  
Bimodal Distribution ◽  
Cycle Performance ◽  
Structure Morphology ◽  
Composite Cathodes ◽  
Tap Density ◽  
Current Densities

High tap-density Li0.99W0.01FePO4/C composite have been synthesized via a simple and low-cost solid state-carbothermal reduction method, using Fe2O3and citrate ferric as the Fe3+precursors and citric radical containing in citrate ferric as both carbon source and reducing agent. The structure, morphology, and physicochemical properties of Li0.99W0.01FePO4/C composite were characterized by XRD, SEM, laser diffraction and scattering measurement, and tap-density testing. It is observed the particle distribution of the Li0.99W0.01FePO4/C composite is bimodal distribution. Because of the smaller particles filling in the space between the larger particles, the Li0.99W0.01FePO4/C composite exhibits less vacancy, which resulted in a high tap density of 1.50 g•cm-3. The Li0.99W0.01FePO4/C composite also shows good rate capability and cycle performance. At current densities of 0.2, 0.5, 1.0 and 1.5 C, the composite material has initial discharge specific capacity of 141, 133, 130 and 125 mAh•g-1, respectively.

Synthesis and Magnetic Properties of Fe–Ni Alloy Nanoparticles Obtained by Hydrothermal Reaction

2011 ◽  
Vol 239-242 ◽  
pp. 748-753 ◽  
Author(s):  
Ming Liang Yuan ◽  
Jia Hua Tao ◽  
Liang Yu ◽  
Cong Song ◽  
Guan Zhou Qiu ◽  
...  
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Hydrothermal Reaction ◽  
Low Cost ◽  
Particle Morphology ◽  
Alkaline Media ◽  
Alloy Nanoparticles ◽  
Important Relationship ◽  
Structure Morphology ◽  
Ni Alloy

The magnetic properties of Fe-Ni alloy nanoparticles with particle size in the range 35-45 nm were prepared by almost simultaneously reducing Fe(II) and Ni(II) solution using hydrazine hydrate as a reducing agent in strong alkaline media for two hours at 80 °C. Chemical composition, crystal structure, morphology, thermal stability and magnetic properties of as synthesized Fe-Ni alloy nanoparticles were systematically characterized by means of XRD, TEM, TG-DSC and VSM. These results indicate that there is a vitally important relationship among particle size, particle morphology, and different mol ratio of FeSO4to NiSO4. The saturation magnetization (Ms). and coercivity (Hc) strongly affected by the composition of Fe-Ni alloy nanoparticles. The hydrothermal reaction is a simple, effective, and low-cost synthetic method to prepare FeNi3alloy nanoparticles.

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