Study on Electrodeposition of Ni-Graphite Composite Coatings in Sulfamate Bath

2010 ◽  
Vol 150-151 ◽  
pp. 1546-1550 ◽  
Author(s):  
Xiang Zhu He ◽  
Xiao Wei Zhang ◽  
Xin Li Zhou ◽  
Zhi Hong Fu
Keyword(s):  
Surface Morphology ◽  
Process Parameters ◽  
Current Density ◽  
Graphite Particle ◽  
Particle Concentration ◽  
Composite Coatings ◽  
Nickel Matrix ◽  
Graphite Composite ◽  
Surface Morphologies ◽  
Sulfamate Bath

This paper presented the composite coatings of nickel with graphite particle on the aluminum substrate using a nickel sulfamate bath. Effects of graphite particle concentration on the surface morphologies of the composite coatings were investigated. The inclusion of graphite particle into metal deposits was dependent on many process parameters, including particle concentration, current density, pH and temperature. Results of SEM and XRD demonstrated that graphite particle had successfully deposited on that nickel matrix; besides, the surface morphology of coatings obtained from sulfamate bath containing 2g/L graphite particle dispersed more uniformly than the ones with higher concentration.

Improvement of microstructure and properties of Ni–Al2O3 composite coating via jet electrodeposition

2020 ◽  
Vol 34 (27) ◽  
pp. 2050243
Author(s):  
Hui Fan ◽  
Jie Jiang ◽  
Yangpei Zhao ◽  
Shankui Wang ◽  
Zhijing Li
Keyword(s):  
Wear Rate ◽  
Surface Morphology ◽  
Composite Coating ◽  
Process Parameters ◽  
Current Density ◽  
Composite Coatings ◽  
Coating Structure ◽  
Mechanical And Tribological Properties ◽  
Al2o3 Composite ◽  
Jet Electrodeposition

Ni–Al2O3 composite coatings were prepared with a modified Watt’s bath by using jet electrodeposition method. As the key process parameter, current density and the addition of Al2O3 nanoparticles in electrolyte were studied about the effect on the surface morphology and co-deposition of Al2O3 nanoparticles of composite coating. The mechanical and tribological properties of the composite coating were also tested. The results show that properly increasing the current density and Al2O3 addition can increase the co-deposition of nanoparticles in the coating and promote the formation of a dense and refined coating structure. Using the optimized process parameters of current density (300 A/dm2) and Al2O3 addition (30 g/L), the co-deposition of Al2O3 in the composite coating can reach a maximum of 13.1 at.%. The hardness of the coating reaches the peak at 623 HV. The wear rate of the composite coating is also greatly reduced with optimized parameters.

Ni-TiN Composite Coatings Prepared by Ultrasonic-Magnetic-Electrodeposition

2012 ◽  
Vol 562-564 ◽  
pp. 246-249
Author(s):  
Chun Yang Ma ◽  
Chun Hua Ma ◽  
Zhan Fa Yang
Keyword(s):  
Wear Resistance ◽  
Current Density ◽  
Particle Concentration ◽  
Composite Coatings ◽  
Ultrasonic Power ◽  
Magnetic Intensity ◽  
Technical Parameters ◽  
Tin Coatings ◽  
Optimum Parameters ◽  
Grinding Machine

Ni-TiN; Composite coating; Ultrasonic-magnetic-electrodeposition Abstract: In this paper, Ni-TiN composite coatings were prepared by ultrasonic-magnetic- electrodeposition. The optimum parameters were achieved by experiments and analysis. The structure of Ni-TiN coatings was observed using HRTEM. And the wear resistance was tested by the grinding machine. The results illuminated that the optimum technical parameters prepared Ni-TiN coatings are TiN particle concentration 4g/L, ultrasonic power 200W, magnetic intensity 0.6T, current density 5A/dm2, temperature of the electrolyte 50°C, pH 4.5. The HRTEM showed that the diameter of Ni grains and TiN particle in Ni-TiN coatings were about 60nm and less than 40nm, respectively.

Preparation and Property of Electrodeposited Zn-Fe-SiO2 Composite Coating

2008 ◽  
Vol 373-374 ◽  
pp. 212-215 ◽  
Author(s):  
Yun Ying Fan ◽  
Ying Jie Zhang ◽  
Peng Dong
Keyword(s):  
Corrosion Resistance ◽  
Hydrogen Embrittlement ◽  
Surface Morphology ◽  
Composite Coating ◽  
Hydrogen Content ◽  
Particle Concentration ◽  
Composite Coatings ◽  
Particle Content ◽  
Sulfate Bath ◽  
Sio2 Particles

Electrodeposited Zn and Zn-Fe alloy have been applied widely to protect steel from corrosion, but the property of coating still needs to be improved. In this paper, Zn-Fe-SiO2 composite coatings are electrodeposited from Zn-Fe alloy electrolyte containing SiO2 particles. Zinc based coatings with Fe% >1%(mass) are deposited from sulfate bath, and coatings with Fe% <1%(mass) are deposited from chloride bath. Particle content in the composite coating generally increases with particle concentration under an adequate agitation and then tends to saturation. The optimum particle content in the composite coating is 0.5%(mass). Corrosion resistance, porosity, hydrogen embrittlement and surface morphology of Zn-Fe-SiO2 composite coatings have been tested and compared with electrodeposited Zn and Zn-Fe alloy. The data implies that Zn-Fe-SiO2 composite coating has the best corrosion resistance, lowest porosity, lowest hydrogen content and the finest crystal. All the results show that Zn-Fe-SiO2 composite coating is satisfactory to be used as anti-corrosion material for steel and has a great future in application.

scholarly journals Effect of Current Density on Electrodeposition of Nickel-Organic Microcapsules Composite Coatings

2014 ◽  
Vol 16 (4) ◽  
Author(s):  
O. Kholkin ◽  
A. Kurbatov ◽  
Gary W. Beall ◽  
T. Djenizian ◽  
A.K. Galeyeva ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Current Density ◽  
Mass Fraction ◽  
Composite Coatings ◽  
Particle Sizes ◽  
Nickel Matrix ◽  
Properties Of Coatings ◽  
Polymer Shell ◽  
Deposition Parameters ◽  
Electrodeposition Of Nickel

<p>A formation of protective composite coatings based on nickel and organic substance of inert nature, containing a corrosion inhibitor, encapsulated in a polymer shell, was studied. The microcapsules were synthesized in an aqueous-organic emulsion using the method of formation of shell of the modified gelatine on the surface of microdroplets. Composite coatings were obtained by electrochemical codeposition of nickel matrix and microcapsules, suspended in the electrolyte. Changes of surface morphology, microhardness and corrosive properties of coatings with respect to changes of deposition parameters of coatings were investigated.  The distribution of particle sizes in coatings depending on the current density was studied. It was shown that an increase in the mass fraction of the microcapsules in the coating leads to an increase in its corrosion resistance.</p>

scholarly journals The Influence of Surface Morphology of Buffer Layer on the Critical Current Density in YBCO Coated Conductors

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Jie Xiong ◽  
Yudong Xia ◽  
Fei Zhang ◽  
Yan Xue ◽  
Kai Hu ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Critical Current Density ◽  
Buffer Layer ◽  
Critical Current ◽  
Current Density ◽  
Coated Conductors ◽  
Buffer Layers ◽  
X Ray Diffraction ◽  
Ybco Films ◽  
Surface Morphologies

1 μm-thickYBa2Cu3O7-δ(YBCO) films were grown on the Y2O3/yttria stabilized zirconia (YSZ)/CeO2buffer layers with different surface morphologies using direct-current sputtering. The critical current density (Jc) value of YBCO was 1.1 MA/cm2when the root mean square surface roughness (Rrms) of the buffer layer was 2.5 nm. As theRrmsof the buffer layer increased to 15 nm, theJcdecreased to 0.3 MA/cm2. X-ray diffraction and scanning electron microscopy showed the strong relevance of the evolution of the structure and surface morphologies of YBCO films with the buffer layer of differentRrms. A model was proposed to explain the influence of surface morphology on the superconducting properties of YBCO films.

Effects of the Additives and Current Density on the Electrodeposition Behavior and Mechanical Properties of the Ni-SiC Composite Coatings

2007 ◽  
Vol 345-346 ◽  
pp. 1533-1536 ◽  
Author(s):  
Teck Su Oh ◽  
Jae Ho Lee ◽  
Ji Young Byun ◽  
Tae Sung Oh
Keyword(s):  
Mechanical Properties ◽  
Sulfuric Acid ◽  
Composite Coating ◽  
Surface Properties ◽  
Current Density ◽  
Composite Coatings ◽  
Cross Sectional ◽  
Sic Particles ◽  
Current Densities ◽  
Sulfamate Bath

In Ni-SiC composite coating, the SiC content is dependent on the surface properties of SiC particles. As sulfuric acid has a strong dehydration force, addition of sulfuric acid in the Ni sulfamate bath changed the surface properties of SiC particles, affecting the codeposition behavior of SiC particles. Also the additives such as SDS affect the electrodeposition behavior of the Ni-SiC composite coating. In this study, effects of the HSO4 ‾ and the current density on the electrodeposition behavior of the Ni-SiC composite coating have been investigated. The Ni-SiC composite coatings were electrodeposited at current densities of 50~200mA/cm2. The surface and cross-sectional morphologies of the Ni-SiC composite coatings were observed using SEM, and their mechanical properties were characterized with micro-Vikers hardness.

scholarly journals Effects of Process Parameters and CrCl3 Concentration on the Structure, Surface Morphology, Composition and Corrosion Resistance of Electrodeposited NiCrP Amorphous Alloy Coatings

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 795
Author(s):  
Jingjing Xiao ◽  
Jinku Yu ◽  
Fuyu Guo ◽  
Qi Qiao ◽  
Haibo Yang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Amorphous Alloy ◽  
Surface Morphology ◽  
Process Parameters ◽  
Current Density ◽  
Electrochemical Impedance ◽  
Sodium Dodecyl ◽  
Alloy Coating ◽  
Corrosion Current ◽  
Structure Surface

Herein, NiCrP amorphous alloy coatings were prepared on copper substrates by electrodeposition. The aim of this paper is to replace Cr6+ with Cr3+ to prepare NiCrP amorphous alloy coating, which can reduce environmental pollution. By studying the influence of pH, temperature (T), current density (DK), and CrCl3 concentration on the structure, surface morphology, composition, and corrosion resistance of the alloy coatings, the optimum bath formulation and process parameters were determined as follows: 25 g·L−1 NiSO4·6H2O, 100 g·L−1 CrCl3·6H2O, 20 g·L−1 NaH2PO2·H2O, 80 g·L−1 Na3C6H5O7·2H2O (sodium citrate), 40 g·L−1 H3BO3, 50 g·L−1 NH4Cl, 1 g·L−1 KF, 5 g·L−1 C7H5O3NS (saccharin), 0.05 g·L−1 C12H25SO4Na (sodium dodecyl sulfate), and 40 mL·L−1 HCOOH and T: 30 °C, DK: 15 A·dm−2, and pH: 3.5, respectively. NiCrP amorphous alloy coatings with high corrosion resistance were prepared under the abovementioned conditions. The crystal cells of the coating surface are uniform and fine. The corrosion resistance of the NiCrP amorphous alloy coatings was characterized by polarization curves, electrochemical impedance spectroscopy, and an immersion corrosion test and compared with that of the NiP amorphous alloy coating. The results show that Ni91.9P8.1 and Ni83.5Cr8.3P8.2 corrosion potential and corrosion current density are −0.68, −0.44 V, and 36, 7 μA·cm−2 in 3.5 wt.% NaCl, respectively. With Ni91.9P8.1 and Ni83.5Cr8.3P8.2, the maximum weight loss is 61.67 and 15.42 mg·dm−2 in a 1 mol·L−1 HCl, respectively. The corrosion resistance of the NiCrP amorphous alloy coatings in 3.5 wt.% NaCl and 1 mol·L−1 HCl solutions is better than that of the NiP alloy coating.

KINETIC STUDY OF WC PARTICLES INCORPORATION IN NICKEL COMPOSITE PLATING

2010 ◽  
Vol 17 (03) ◽  
pp. 359-362
Author(s):  
DAE-GEUN KIM ◽  
JAE-HO LEE
Keyword(s):  
Current Density ◽  
Particle Concentration ◽  
Film Surface ◽  
Experimental Results ◽  
Particle Diffusion ◽  
Electrode Geometry ◽  
Nickel Matrix ◽  
Electrode Rotation ◽  
Composite Plating ◽  
The Matrix

The particles, suspended in the electrolyte, can be co-deposited with metal. The co-deposition behaviors of WC and Co-coated WC particles on nickel matrix were investigated. Many operating parameters that influence on the quantity of incorporated particles, including current density, bath agitation and electrolyte composition were investigated. The co-deposition of particles during electroplating depends on the rate of metal deposition and on the flux of particles to the film surface. The growth rate of the metal film is determined by the current density, whereas the flux of particles to the electrode surface is dependent on the particle size, particle concentration in solution, the electrode rotation rate, the particle diffusion coefficient, and the electrode geometry. The kinetic parameters in the co-deposition were calculated from the experimental results. Co-coated WC particles were easily incorporated in the matrix than WC particles from the calculated and experimental results.

Defect morphology in thick relaxed layers of InGaAs on GaAs

1990 ◽  
Vol 48 (4) ◽  
pp. 668-669
Author(s):  
R H Dixon ◽  
P Kidd ◽  
P J Goodhew
Keyword(s):  
Electron Microscopy ◽  
Surface Morphology ◽  
Growth Conditions ◽  
X Ray Diffraction ◽  
Double Crystal ◽  
Strained Layers ◽  
Good Surface ◽  
Transmission Electron ◽  
Device Structures ◽  
Surface Morphologies

Thick relaxed InGaAs layers grown epitaxially on GaAs are potentially useful substrates for growing high indium percentage strained layers. It is important that these relaxed layers are defect free and have a good surface morphology for the subsequent growth of device structures.3μm relaxed layers of InxGa1-xAs were grown on semi - insulating GaAs substrates by Molecular Beam Epitaxy (MBE), where the indium composition ranged from x=0.1 to 1.0. The interface, bulk and surface of the layers have been examined in planar view and cross-section by Transmission Electron Microscopy (TEM). The surface morphologies have been characterised by Scanning Electron Microscopy (SEM), and the bulk lattice perfection of the layers assessed using Double Crystal X-ray Diffraction (DCXRD).The surface morphology has been found to correlate with the growth conditions, with the type of defects grown-in to the layer (e.g. stacking faults, microtwins), and with the nature and density of dislocations in the interface.

Studies and Research on the Corrosion Behavior of Ni-Al2O3 Compound Coatings Obtained by Electrochemical Methods

2020 ◽  
Vol 43 (3) ◽  
pp. 21-25
Author(s):  
Simona BOICIUC ◽  
◽  
◽  
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Corrosion Behaviour ◽  
Composite Coatings ◽  
Point Of View ◽  
Electrochemical Methods ◽  
Dispersed Phase ◽  
Nickel Matrix ◽  
Technical Alumina ◽  
Compound Coatings

The undertaken research which is described in this paper aims at the corrosion behaviour of composite coatings in nickel matrix using as dispersed phase technical alumina with dimensions of 5 μm and their characterization from a microstructural point of view. The corrosion resistance in the saline fog of the coatings is influenced by the microstructure, the stresses developed in the layer and the roughness.

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