Influence of Nano Al2O3 Particles on Morphology and Microstructure of Cu-Al2O3 Composite Coating by Jet Electrodeposition

2018 ◽  
Vol 764 ◽  
pp. 164-173 ◽  
Author(s):  
Hui Fan ◽  
Man Liu ◽  
Yang Pei Zhao ◽  
Shan Kui Wang
Keyword(s):  
Surface Morphology ◽  
Composite Coating ◽  
Current Density ◽  
Steel Substrate ◽  
Metal Layer ◽  
Xrd Analysis ◽  
304 Stainless Steel ◽  
Al2o3 Nanoparticles ◽  
Jet Electrodeposition ◽  
Al2o3 Particles

Jet electrodeposition process is a very promising method in fabricating metal matrix composites reinforced with ceramic particles. In use of this method, insoluble particles suspended in an electrolytic bath are impinged onto and embedded in a growing metal layer. This paper is focused on the investigations of the copper matrix nanocomposite coatings with hard Al2O3 nanoparticles, electrochemically deposited from jet-circulated baths on 304 stainless steel substrate. The Cu-Al2O3 composite coating was characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis. The effects of electrolyte jet velocity, current density, addition amount of Al2O3 in the electrolyte were analyzed on the microstructure change, surface morphology change as well as codeposited content of Al2O3 particles in the composite coating. It was found that increasing content of Al2O3 particles in electrolyte may improve composite coating surface morphology and increase the practical current density by exerting impingement effect on the cathode deposit surface, till excessive Al2O3 e.g.20g/L particles was added. Besides, appropriate amount of nanoparticles in the electrolyte also could offer grain refinement by providing nanocrystalline sized between 30~60 nm with current density in the range of 100~500 A/dm2.

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.

A Study on the Electrodeposited Cu-Al2O3 Composites Coating With Laser Treatment

2007 ◽  
Author(s):  
Hui Fan ◽  
Yinhui Huang ◽  
Zongjun Tian ◽  
Zhidong Liu ◽  
Jinsong Chen
Keyword(s):  
Laser Treatment ◽  
Current Density ◽  
Steel Substrate ◽  
Compound Layer ◽  
Tensile Tests ◽  
Small Current ◽  
Electro Deposition ◽  
Weight Percentage ◽  
Jet Electrodeposition ◽  
Al2o3 Particles

One kind of jet electrodeposition machine with multi-spindle function has been successfully designed and launched. With the jet electro-deposition device, Al2O3 particles of average size 30 nm were co-deposited with Copper on a steel substrate using a Watts bath at 50°C and the compound layer was processed by laser in order to make the layer clad on the substrate in a well binding force. The compound layer’s microstructure was examined by scanning electron microscopy (SEM), the mechanical properties of the coated steels were examined with hardness and tensile tests. The effects exerted by the current density, weight percentage of Al2O3 in electrolyte and the presence of laser treatment was investigated respectively. It shows a relatively small current density and a certain of Al2O3 particles have a positive effect on both surface morphology and coated material’s mechanical behavior. In addition, result also shows the coating processed by laser, attained a hardness up to 820 HV, which is considerably increased than substrate.

Commensurability of the Structures of Boride Layers

2011 ◽  
Vol 495 ◽  
pp. 181-184 ◽  
Author(s):  
E.M. Pechlivani ◽  
F. Stergioudis
Keyword(s):  
Surface Morphology ◽  
Base Metal ◽  
Low Temperatures ◽  
Steel Substrate ◽  
Xrd Analysis ◽  
Steel Substrates

The interaction of solid NH4HCO3 with iron, where the ammonia product has been adsorbed nondissociatively to iron surfaces at low temperatures [1] was investigated. The nitride clusters formed on steel substrates modified the surface morphology and characteristics of the substrate and influenced their adhesion during subsequent procedure of coating. In our case, efforts were made to decorate the steel substrate in order to influence the base metal reactivity towards boron and its ability to react and form stable compounds with boron [2]. Boride layers on steel are examined by means of SEM and XRD analysis. The decorated surface was observed by FTIR method.

Effect of Current Density on Composition and Microstructure of Boronized Layer by Electrodeposition

2011 ◽  
Vol 338 ◽  
pp. 589-593
Author(s):  
Guo Zhang Tang ◽  
Yun Gang Li ◽  
Ning He ◽  
Yu Zhu Zhang ◽  
Hai Li Yang
Keyword(s):  
Glow Discharge ◽  
Current Density ◽  
Molten Salts ◽  
Steel Substrate ◽  
Xrd Analysis ◽  
Silicon Steel ◽  
X Ray Diffraction ◽  
Cross Sectional ◽  
X Ray ◽  
Compositional Depth Profile

Boronized layer was prepared on silicon steel substrate by pulse electrodeposition in KCl-NaCl-NaF-Na2B4O7 molten salts with different current density. The effect of current density on composition and microstructure of boronized layer was studied. The phase, the cross-sectional morphology and the compositional depth profile of the layer were studied by X-ray diffraction analysis (XRD), optical microscopy (OM) and glow discharge spectrometry (GDS). The presence of FeB on the surface of the boronizied steel was confirmed by XRD analysis. Cross sectional observation revealed that the boronized layer consisted of the outer layer FeB and the sublayer Fe2B. In addition, the low current density produced more proportion of Fe2B and bigger saw-tooth grains.

scholarly journals Enhanced Wear Performance of Cu-Carbon Nanotubes Composite Coatings Prepared by Jet Electrodeposition

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 392 ◽  
Author(s):  
Dongdong Ning ◽  
Ao Zhang ◽  
Hui Wu
Keyword(s):  
Carbon Nanotubes ◽  
Surface Morphology ◽  
Composite Coating ◽  
Composite Coatings ◽  
Sodium Dodecyl ◽  
Wear Test ◽  
Uniform Electric Field ◽  
Wear Performance ◽  
Jet Electrodeposition ◽  
Pure Cu

Cu-carbon nanotubes (CNTs) composite coatings with high CNT content and uniformly distributed CNTs were successfully prepared via jet electrodeposition. Pristine CNTs, without any treatment like acid functionalization, were used. Anionic surfactant sodium dodecyl sulfate (SDS) was used to increase the wettability of the CNTs and improve the content of incorporated CNTs. With an appropriate SDS concentration (300 mg/L) in the electrolyte, the incorporated CNT content is as high as 2.84 wt %, much higher than the values reported using conventional electrodeposition (0.42–1.05 wt %). The high-content CNTs were uniformly distributed in the composite coating. The surface morphology of this composite coating (2.84 wt % CNTs) was flat due to the uniform electric field in jet electrodeposition. In the wear test a with load of 1 N and sliding speed of 0.02 m/s, the wear rate of this composite coating was 1.3 × 10−2 mg/Nm, 85.4% lower than that of pure Cu. The enhanced wear performance of Cu-CNTs composite coatings can be attributed to high CNT content and flat surface morphology.

Effects of Current Density on the Microstructure and Properties of Electrodeposited Black Cr-C Nano-Composite Coatings on Steel Substrate

2011 ◽  
Vol 687 ◽  
pp. 641-646 ◽  
Author(s):  
Xue Song Li ◽  
Yue Yang ◽  
You Yang ◽  
Hua Wu
Keyword(s):  
Composite Coating ◽  
Current Density ◽  
Steel Substrate ◽  
Composite Coatings ◽  
Scanning Electronic Microscopy ◽  
Electronic Microscopy ◽  
Particle Content ◽  
Nano Composite ◽  
X Ray ◽  
Nano Composite Coating

Eelectrodeposited black Cr-C nano-composite coating was prepared on the steel substrate and the effects of current density on the properties of the composite coating were studied in the present paper. The surface morphology and phase composition of the composite coatings were analyzed by means of scanning electronic microscopy (SEM) and X-ray diffractometer (XRD). Microhardness was determined by micrometer and the wear resistance of the coatings was evaluated by CETR using a universal materials tester (UMT). The results showed that formed under the condition of current density of 100A/dm2, temperature of 15°C, and the optimum particle content in electrolyte was 10g/l. The maximum microhardness of black Cr-C nano-composite coating was 10.8 Gpa, simutaneously, the wearing resistance of the coating improved significantly compared to the steel substrate.

Preparation and Characterization of Nanocomposite Ni-Al2O3 Thin Films by Ultrasonic-Electrodeposition Technology

2011 ◽  
Vol 130-134 ◽  
pp. 994-997
Author(s):  
Jin Dong Wang ◽  
Fa Feng Xia
Keyword(s):  
Thin Films ◽  
Electron Microscope ◽  
Steel Substrate ◽  
Al2o3 Nanoparticles ◽  
X Ray Diffraction ◽  
Technological Parameters ◽  
Transmission Electron ◽  
Metallurgical Structure ◽  
Al2o3 Particles

Nanocomposite Ni-Al2O3 thin film containing nanosized Al2O3 particles had been grown on steel substrate by ultrasonic-electrodeposited technology. The optimum technological parameters of nanocomposite Ni-Al2O3 thin films were obtained by experiments and analysis. X-ray diffraction analysis was utilized to detect the crystalline and amorphous characteristics of Ni-Al2O3 thin films. The surface morphology and metallurgical structure were analysed by high resolution transmission electron microscope, and scanning electron microscope. The test results showed that nanocomposite Ni-Al2O3 thin films prepared by proper ultrasonic-electrodeposited method consist of nanometer-sized Al2O3 particles and nickel grains. And the Al2O3 nanoparticles and Ni grains diameters in thin films are about 40nm and 80nm, respectively.

scholarly journals Efficient Preparation of Nanoparticle-Reinforced Nickel-based Composite Coating with Highly Preferred (220) Orientation

2020 ◽  
Vol 33 (1) ◽  
Author(s):  
Renjie Ji ◽  
Hui Jin ◽  
Yonghong Liu ◽  
Tiancong Dong ◽  
Fan Zhang ◽  
...  
Keyword(s):  
Composite Coating ◽  
Current Density ◽  
Corrosion Potential ◽  
Composite Coatings ◽  
Corrosion Current ◽  
Part Surface ◽  
Strong Adhesion ◽  
Jet Electrodeposition ◽  
Corrosion Pits ◽  
Deposition Current Density

AbstractNanoparticle-reinforced metal matrix composite coatings have significant potential in mechanical part surface strengthening owing their excellent mechanical properties. This paper reports a phenomenon in which the grain orientation gradually evolves to (220) as the deposition current density increases when preparing nanoparticle-reinforced nickel-based composite coatings through jet electrodeposition (JED). During the preparation of the Ni-SiC composite coatings, the deposition current density increased from 180 A/dm2 to 220 A/dm2, and TC(220) gradually increase from 41.4% to 97.7%. With an increase of TC(220), the self-corrosion potential increases from −0.575 to −0.477 V, the corrosion current density decreases from 9.52 μA/cm2 to 2.76 μA/cm2, the diameter of the corrosion pits that after 10 days of immersion in a 3.5 wt% NaCl solution decreases from 278–944 nm to 153–260 nm, and the adhesion of the coating increases from 24.9 N to 61.6 N. Compared a conventional electrodeposition (CED), the Ni-SiC composite coating using JED has the advantages of a smooth surface morphology, high corrosion resistance, and strong adhesion, which are more obvious with an increase in TC(220).

scholarly journals Effect of Electrodeposition Parameters on the Composition and Surface Topography of Nanostructured Coatings by Tungsten with Iron and Cobalt

2020 ◽  
Vol 22 (1) ◽  
pp. 19
Author(s):  
G. Yar-Mukhamedova ◽  
M. Ved’ ◽  
I. Yermolenko ◽  
N. Sakhnenko ◽  
A. Karakurkchi ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Current Density ◽  
Steel Substrate ◽  
Structural Features ◽  
Refractory Component ◽  
Reduction Of Iron ◽  
Citrate Electrolyte ◽  
Spherical Agglomerates ◽  
Competitive Reduction ◽  
Off Time

The electrodeposition of binary and ternary coatings Fe-W and Fe-Co-W from mono ligand citrate electrolyte has been investigated. The Fe-Co-W coatings were formed from electrolytes, which composition differs in the ratio of the concentrations of the alloying components and the ligand content. The investigation results indicate a competitive reduction of iron, cobalt and tungsten, the nature of which depends both on the ratio of electrolyte components, and electrolysis parameters. The effect of both current density amplitude and pulse on off time on quality, composition and surface morphology of the galvanic alloys was determined. Coatings deposited on a direct current with a density of more than 6.5 A/dm2, crack and peel off from the substrate due to the inclusion of Fe (III) compounds containing hydroxide anions. The use of non-stationary electrolysis allows us to extend the working range of current density to 8.0 A/dm2 and form electrolytic coatings of sufficient quality with significant current efficiency and the content of the refractory component. The presence of the Co7W6, Fe7W6, α-Fe, and Fe3C phases detected in the Fe-Co-W deposits reflects the competition between the alloying metals reducing from hetero-nuclear complexes. The surface of binary and ternary coatings is characterized by the presence of spherical agglomerates and is more developed in comparison with steel substrate. The parameters Ra and Rq for electrolytic alloy Fe-W are of 0.1, for Fe-Co-W are 0.3, which exceeds the performance of a polished steel substrate (Ra = 0.007 and Rq = 0.010). These properties prospect such alloys as a multifunctional layer are associated with structural features, surface morphology, and phase composition.

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