Preparation of Ni-Nd2O3 Nanocomposite Coatings by Electrodeposition under Dual-Frequency Ultrasound

2012 ◽  
Vol 591-593 ◽  
pp. 1001-1005 ◽  
Author(s):  
Zheng Hong Ao ◽  
Yu Jun Xue ◽  
Xian Hui Li ◽  
Ji Shun Li
Keyword(s):  
Smooth Surface ◽  
Cathode Current Density ◽  
Nanocomposite Coating ◽  
Nanocomposite Coatings ◽  
Probe Type ◽  
Dual Frequency ◽  
High Quality ◽  
Cathode Current ◽  
Surface Morphologies ◽  
Frequency Ultrasound

The Ni-Nd2O3 nanocomposite coatings were prepared by electrodeposition under dual-frequency ultrasound(DU). The Nd2O3 content and surface morphology of Ni-Nd2O3 nanocomposite coatings were analyzed by scanning electron microscopy (SEM). The results showed that the Nd2O3 content of the nanocomposite coating prepared by electrodeposition using DU was high at 3.48% and the surface morphologies of DU nanocomposite coating showed better smooth surface, finer grain and more compact microstructure. A kind of method to prepare high quality Ni-Nd2O3 nanocomposite coating was obtained, which was: 40 g/L Nd2O3 nanoparticles, 45°C the temperature of electrolyte, 4A/dm2 cathode current density, 240W the power of bath-type ultrasound(BU), 100kHz the frequency of BU, 30W the power of probe-type ultrasound(PU), 20kHz the frequency of PU, and 1000r/min the stirring speed.

Effect of Ultrasound Power on Ni-Nd2O3 Nanocomposite Coatings Prepared by Electrodeposition in Combination Ultrasonic Field

2014 ◽  
Vol 678 ◽  
pp. 597-600 ◽  
Author(s):  
Zheng Hong Ao ◽  
Yu Jun Xue ◽  
Xian Hui Li ◽  
De Ying Zhang
Keyword(s):  
Smooth Surface ◽  
Great Influence ◽  
Ultrasonic Field ◽  
Nanocomposite Coating ◽  
Nanocomposite Coatings ◽  
Probe Type ◽  
Ultrasound Field ◽  
Surface Morphologies ◽  
Scanning Electron ◽  
Ultrasound Power

The Ni-Nd2O3 nanocomposite coatings were prepared by electrodeposition under combination ultrasound field. The Nd2O3 content and surface morphology of coatings were analyzed by scanning electron microscopy (SEM). And the microhardness of coatings was tested. The results showed that ultrasound power is a great influence on Nd2O3 content in coatings. The Nd2O3 content of the nanocomposite coating prepared by electrodeposition using combination ultrasound was high at 3.48%, when bath-type ultrasound power was 240W and probe-type ultrasound power was 30W. And the surface morphologies of nanocomposite coating showed better smooth surface, finer grain and more compact microstructure.

Preparation of Ni-ZrO2-CeO2 Nanocomposite Coatings by Pulse Electrodeposition

2013 ◽  
Vol 395-396 ◽  
pp. 174-178 ◽  
Author(s):  
Yang Yang Xu ◽  
Yu Jun Xue ◽  
Fang Yang ◽  
Chun Yang Liu ◽  
Ji Shun Li
Keyword(s):  
Current Density ◽  
Smooth Surface ◽  
Pulse Current ◽  
Nanocomposite Coating ◽  
Pulse Electrodeposition ◽  
Nanocomposite Coatings ◽  
Duty Ratio ◽  
Average Current Density ◽  
Average Current ◽  
Surface Morphologies

Ni-ZrO2-CeO2nanocomposite coatings were prepared by pulse electrodeposition. The effect additions of ZrO2and CeO2nanoparticles, average current density, duty ratio and frequency of pulse current on nanoparticle contents of Ni-ZrO2-CeO2nanocomposites were studied. The surface morphologies and microhardness of different nanocomposite coatings (Ni-ZrO2, Ni-CeO2, Ni-ZrO2-CeO2) were analyzed. The results show that, with the average current density, duty ratio and frequency increased, the nanoparticle contents increased at first and then decreased. Compared with Ni-ZrO2and Ni-CeO2, the surface morphology of Ni-ZrO2-CeO2nanocomposite coating showed better smooth surface and more compact microstructure, the microhardness was also higher.

Effect of Ultrasound Action Modes on the Oxidation Resistance of Ni-Nd2O3 Nanocomposite Coatings

2011 ◽  
Vol 120 ◽  
pp. 280-283 ◽  
Author(s):  
Xian Hui Li ◽  
Yu Jun Xue ◽  
De Ying Zhang ◽  
Ji Shun Li
Keyword(s):  
Electron Microscopy ◽  
Oxidation Resistance ◽  
Nanocomposite Coating ◽  
The Other ◽  
Nanocomposite Coatings ◽  
Dual Frequency ◽  
Action Modes ◽  
Ultrasound Action ◽  
Scanning Electron ◽  
Frequency Ultrasound

The Ni-Nd2O3nanocomposite coatings were prepared by electrodeposition with different modes of ultrasound action. The surface morphology and co-deposited Nd2O3content of Ni-Nd2O3nanocomposite coatings were analyzed by scanning electron microscopy (SEM). The microstructure of Ni-Nd2O3nanocomposite coatings after oxidation was examined. The oxidation resistance of the coatings prepared by different electrodeposition methods was comparatively investigated. The results show that the content of Nd2O3nanoparticles greatly influences the oxidation resistance of nanocomposite coatings. The nanocomposite coating has an excellent oxidation resistance with the increased content of Nd2O3nanoparticles. Meanwhile, Nd2O3nanoparticles and ultrasound can significantly affect the microstructure and the oxidation resistance of Ni-Nd2O3nanocomposite coatings. The Ni-Nd2O3coating prepared by electrodeposition with dual-frequency ultrasound action has finer grains and denser structure and exhibits a superior oxidation resistance compared with the other coatings.

Electroforming Technology of Ni-CeO2 Nanocomposites Using Rotating Cylindrical Cathode in Ultrasonic Field

2014 ◽  
Vol 678 ◽  
pp. 606-611
Author(s):  
De Ying Zhang ◽  
Yu Jun Xue ◽  
Xian Hui Li ◽  
Zheng Hong Ao
Keyword(s):  
Smooth Surface ◽  
Ultrasonic Field ◽  
Cathode Current Density ◽  
Ultrasonic Power ◽  
Rotating Speed ◽  
High Microhardness ◽  
Cathode Current ◽  
Speed Effect ◽  
Surface Morphologies ◽  
Energy Disperse Spectroscopy

Ni-CeO2nanocomposites were electrodeposited using rotating cylindrical cathode in ultrasonic field. The surface morphologies and the CeO2contents in the nanocomposite were examined by the Scanning Electron Microscopy and the Energy Disperse Spectroscopy. The microhardness of nanocomposites were also evaluated by digital microscopical Weis Sclerometer. The effect of ultrasonic power and cathode rotating speed on the CeO2nanoparticles contents and the distribution condition of the nanocomposites were investigated. The results indicate that both the ultrasonic power and cathode rotating speed effect the microstructure and property of the nanocomposites remarkably. Prepared under the technology parameters of cathode current density 4A/dm2, cathode rotating speed 1200rpm, CeO2nanoparticles addition 40g/L and ultrasonic power 300W, the Ni-CeO2nanocomposites present refined crystal grains, compact microstructure, smooth surface morphology and high microhardness.

Optimization of Process Parameters of Ni-TiN-CeO2 Binary Nanocomposite Coatings by Ultrasound-Pulse Electrodeposition

2012 ◽  
Vol 217-219 ◽  
pp. 1331-1335
Author(s):  
Na Na Liu ◽  
Meng Hua Wu ◽  
Zhi Li
Keyword(s):  
Process Parameters ◽  
Current Density ◽  
Duty Cycle ◽  
Steel Substrate ◽  
Cathode Current Density ◽  
Pulse Electrodeposition ◽  
Nanocomposite Coatings ◽  
Ultrasonic Power ◽  
Cathode Current ◽  
Ultrasound Pulse

Ni-TiN-CeO2 nanocomposite coatings on 45 steel substrate were prepared by ultrasound-pulse electrodeposition. The effects of process parameters, such as CeO2 and TiN nanoparticles addition, cathode current density, positive pulse duty cycle and ultrasonic power on the Ni-TiN-CeO2 nanocomposite electrodeposition process were studied by orthogonal experiments. The nanoparticles contents in the coating were determined, and the surface morphology of the coating was analyzed. The results show that the optimized process parameters are: the CeO2 particles addition of 40g/l, the TiN particles addition of 15g/l, cathode current density of 4A/dm2, positive duty cycle of 20%, and the ultrasonic power of 180W. Under the optimum condition, the desirable Ni-TiN-CeO2 nanocomposite coatings are prepared with higher particle content and better surface quality.

Improved mechanical properties of Cu–Sn–Zn–TiO2 coatings

2019 ◽  
Vol 34 (01n03) ◽  
pp. 2040039
Author(s):  
Yuxin Wang ◽  
Weidong Gao ◽  
Zhen He ◽  
Shengping Zhang ◽  
Li Yin
Keyword(s):  
Mechanical Properties ◽  
Mechanical Performance ◽  
Nanocomposite Coating ◽  
Pulse Electrodeposition ◽  
Nanocomposite Coatings ◽  
Cross Sectional ◽  
Coating Surface ◽  
Tio2 Coatings ◽  
Surface Morphologies ◽  
Wear Tests

This study applied the pulse electrodeposition and duplex electrodeposition techniques to improve the mechanical properties of Cu–Sn–Zn–TiO2 nanocomposite coatings. The phase constituents and surface morphologies of prepared coatings were characterized. The cross-sectional information was recorded. The mechanical properties were determined by microhardness and wear tests. All the prepared coatings presented a nodular surface. Both the addition of TiO2 particles and nickel inner layer refined the coating surface. The pulse electrodeposition led to increased microhardness, while the addition of nickel inner layer further increased the mechanical performance. The best mechanical performance was achieved for the duplex Cu–Sn–Zn–TiO2/Ni nanocomposite coating prepared via pulse electrodeposition.

Ultrasound-Pulse Electrodeposition Preparation of Fe-Nano ZrO2 Functional Gradient Coating

2014 ◽  
Vol 556-562 ◽  
pp. 222-227
Author(s):  
Shuai Yan ◽  
Meng Hua Wu ◽  
Zhi Ning ◽  
Yuan Gang Wang
Keyword(s):  
Current Density ◽  
Duty Cycle ◽  
Cathode Current Density ◽  
Nanocomposite Coating ◽  
Ultrasonic Frequency ◽  
Optimization Of Process Parameters ◽  
Cathodic Pulse ◽  
Nanoparticles Concentration ◽  
Cathode Current ◽  
Orthogonal Optimization

Objective On the basis of the experimental investigation of Fe-ZrO2nanocomposite coating, nanoZrO2particles were added to the bath to prepare the nanocomposite coating of Fe-ZrO2with electroplating methods and laser cladding. Methods Study the effects of nanocontent, cathodic pulse current density, duty cycle, the ultrasonic frequency content of the coating surface Nano, orthogonal optimization of process parameters. Results The results show that nanoparticles concentration 10 g/l, the cathode current density pulse 4A/dm2, the duty cycle 20%, ultrasonic frequency 180W, nanocomposite coating capacity of up to 5.5wt%. Conclusion Fe-ZrO2nanocomposite coating improved abrasion and Corrosion of the binary composite coating.

Studies on the electrodeposition and characterization of PTFE polymer inclusion in Ni–W–BN nanocomposite coatings for industrial applications

RSC Advances ◽  
2015 ◽  
Vol 5 (90) ◽  
pp. 74115-74125 ◽  
Author(s):  
S. Sangeetha ◽  
G. Paruthimal Kalaignan
Keyword(s):  
Smooth Surface ◽  
Nanocomposite Coating ◽  
Industrial Applications ◽  
Nanocomposite Coatings ◽  
Friction Resistance

A Ni–W–BN–PTFE nanocomposite coating with excellent corrosion and friction resistance alongside hardness and a smooth surface was developed.

Bituminous Insulations Durability of Underground Metallic Pipelines I Field investigations

2017 ◽  
Vol 68 (3) ◽  
pp. 581-585 ◽  
Author(s):  
Gabriela Oprina ◽  
Ladislau Radermacher ◽  
Daniel Lingvay ◽  
Dorian Marin ◽  
Andreea Voina ◽  
...  
Keyword(s):  
Cathode Current Density ◽  
Induced Voltage ◽  
Cathodic Current ◽  
Field Investigations ◽  
Operation Period ◽  
Cathode Current ◽  
Protection Potential ◽  
Cathodic Protection System ◽  
Corrosion State ◽  
Good Agreement

The corrosion state of an underground metallic pipeline of �161 mm and 565 m length was assessed by specific electrical and electrochemical measurements. The investigated pipe, buried in 1997, was protected against corrosion by successive layers of bituminous material with a total thickness of 1 to 1.2 mm. The pipeline crosses three electrified railway lines (50 Hz - 28 kV), and then its route is approximately parallel to these lines; thus, the induced AC voltages between line and ground were calculated obtaining values between 4.05 and 7.1 Vrms, in good agreement with the values measured in the accessible points. The measurements regarding the insulation capacity against corrosion of the bituminous insulation, performed at one month and after 19 years of burial, showed an increase of the average cathode current density needed for obtaining the protection potential in the range �1.00 � �1.28 VCu/CuSO4 of approx. three times (from 6.65 up to 19.96 mA/m2), in good agreement with the evolution of the insulation resistance measured between the steel pipe (having a contact area with the ground of 270.5 m2) and a ground socket of 4 W, which decreased from 995 to 315 kW. Following the analysis and processing of the field collected data, it is considered that, by implementing a cheap cathodic protection system (without cathodic current power supply), based on the rectification of the AC induced voltage, the safe operation period of the investigated pipeline may be extended by at least 50 years.

RESTORATION OF MACHINE PARTS WITH GALVANIZED ZINC COATINGS

2020 ◽  
Vol 4 (141) ◽  
pp. 140-147
Author(s):  
MIKHAIL VIKHAREV ◽  
◽  
VLADIMIR YUDIN ◽  
VESELOVSKIY NIKOLAY ◽  
◽  
...  
Keyword(s):  
Current Density ◽  
Cathode Surface ◽  
Zinc Coating ◽  
Cathode Current Density ◽  
Research Purpose ◽  
Cathode Layer ◽  
Properties Of Coatings ◽  
Chemical Polarization ◽  
Cathode Current ◽  
Zinc Coatings

The article shows the role of electroplating in the restoration of parts, indicates the advantages of restoring parts with electroplating over other methods, and gives the characteristics and properties of coatings obtained by electroplating. (Research purpose) The research purpose is in increasing the speed of application of zinc electroplating when restoring parts. (Materials and methods) The cathode current density has a decisive influence on the coating speed. The main reason for limiting the cathode current density during galvanizing from sulfuric acid electrolytes is the chemical polarization of the cathode. The article presents a study on the designed installation for the application of galvanic coatings. When applying coatings to the internal surfaces of parts, there was used a device with activating elements having an electromechanical rotation drive. This device prevents depletion of the near-cathode layer of the electrolyte and reduces the chemical polarization of the cathode. Elements made of moisture-resistant skin were used as activators. (Results and discussion) The article presents the results of experiments as a dependence of the coating speed on the speed of the activator relative to the restoring surface. It also presents the relationship between the size of the abrasive grains of the activating elements, the force of their pressing against the cathode surface, the speed of movement of the activator and the speed of applying the zinc coating, as well as its quality. By activating the cathode surface, it was possible to raise the operating current density to 100-150 amperes per square decimeter. The speed of application of zinc coatings is 16-25 micrometers per minute. (Conclusions) In the course of research, authors determined the conditions of electrolysis during galvanizing, which provide a significant increase in the cathode current density and the rate of application of these coatings during the restoration of parts.

Sign in / Sign up

Export Citation Format

Share Document