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.

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.

Influence of Pulse Electrodeposition Parameters on Thickness of Boronized Layer by Orthogonal Test

2011 ◽  
Vol 338 ◽  
pp. 661-664
Author(s):  
Hai Li Yang ◽  
Guo Zhang Tang ◽  
Yun Gang Li ◽  
Lan Lan Shi ◽  
Yu Zhu Zhang
Keyword(s):  
Current Density ◽  
Duty Cycle ◽  
Boron Content ◽  
Steel Substrate ◽  
Pulse Electrodeposition ◽  
Orthogonal Experimental Design ◽  
Range Analysis ◽  
Electrodeposition Time ◽  
A Current ◽  
Significant Factors

Boronized layer was prepared on carbon steel substrate by pulse electrodeposition in KCl-NaCl-NaF-Na2B4O7 molten salts. The orthogonal experimental design was used to study the influence of pulse electrodeposition parameters on the thickness of boronized layer. The distribution of boron content of the boronized layer was measured using the glow discharge spectrometry (GDS) and the depth from the surface to the inflection point was taken as the layer thickness. It was found that the order of significant factors for the thickness is electrodeposition temperature > electrodeposition time > current density > borax content > duty cycle. Based on the results of the range analysis, the maximum thickness was found at a current density of 120mA/cm2, a electrodeposition temperature of 900°C, a electrodeposition time of 120 min, a duty cycle of 10%, and a borax content of 0.04 mole ratio.

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.

Preparation of Pulse Electrodeposited Mo-Ni Coating

2014 ◽  
Vol 971-973 ◽  
pp. 161-164
Author(s):  
Xiao Zhen Liu ◽  
Le Tian Xia ◽  
Jian Qiang Gen ◽  
Xiao Zhou Liu ◽  
Jie Chen ◽  
...  
Keyword(s):  
Current Density ◽  
Duty Cycle ◽  
Deposition Temperature ◽  
Deposition Time ◽  
Pulse Electrodeposition ◽  
Electro Deposition ◽  
Electrodeposition Method ◽  
Electrodeposition Time ◽  
Ni Alloy

Mo-Ni coatings were prepared on Ni alloy by pulse electrodeposition method. The effects of current density, electrodeposition temperature, frequency, duty cycle and electrodeposition time on microhardness of Mo-Ni coating were researched, respectively. Microhardness of Mo-Ni coating increases with the increase of current density, electrodeposition temperature, frequency and electro-deposition time in 17.75 A/dm2 ~ 19.25 A/dm2. 21 °C~ 25 °C, 1000 Hz ~ 5000 Hz and 10 min ~ 20 min, respectively. Microhardness of Mo-Ni coating decreases with the increase of electrodeposition temperature, electrodeposition time and duty cycle in 25 °C ~ 37 °C, 20 min ~ 30 min and 0.5 ~ 0.9, respectively. In the range of current density from 19.25A/dm2 to 20.75 A/dm2, microhardness of Mo-Ni coating is neariy constant with the increase of current density. When electrodeposition parameters: current density 19.25 A/dm2, electro-deposition temperature 25 °C, frequency 5000 Hz, duty cycle 0.5 and electrodeposition time 20 min, microhardness of Mo-Ni coatin is as high as 707.9 HV.

Experimental Research on Electroforming Nano-ZrO2 Reinforced Cu-Matrix Composite Aided by Pulse Power

2018 ◽  
Vol 764 ◽  
pp. 95-105
Author(s):  
Zhong Wen Sima ◽  
Zhi Yong Li ◽  
Hong Bin Cui ◽  
Hun Guo
Keyword(s):  
Surface Morphology ◽  
Matrix Composite ◽  
Current Density ◽  
Duty Cycle ◽  
Pulse Frequency ◽  
Cathodic Current Density ◽  
Ultrasonic Power ◽  
Cathodic Current ◽  
Maximum Content ◽  
Cycle Pulse

Prepared the nanoZrO2 reinforced Cu-matrix composite by pulse electroforming. The effects of the content of nanoZrO2 particle in the casting solution, average cathodic current density, duty cycle, pulse frequency and ultrasonic power on the content of nanoZrO2 in the electroforming Cu-matrix composite have been studied. The microhardness and surface morphology of Cu-ZrO2 composite were analyzed. The experimental results demonstrate that the maximum content of nanoZrO2 in the electroforming Cu-ZrO2 composite is 2.94%, microhardness is 492 HV, which is significantly improved compared with pulse pure copper’s 337 HV, when the content of nanoZrO2 is 40 g/L, average cathodic current density is 4A/dm2, duty cycle is 0.2 , pulse frequency is 1100 Hz and ultrasonic power is 20w .The surface of composite prepared by pulse electroforming is more smooth, organization is denser, grain is finer and agglomeration of nanoZrO2 particles is fewer compared with Direct-current electroforming nanoZrO2 reinforced Cu-ZrO2 composite.

Study on Electroplated Diamond Wire Saw Development and Wire Saw Wear Analysis

2009 ◽  
Vol 416 ◽  
pp. 311-315 ◽  
Author(s):  
Pei Qi Ge ◽  
Yu Fei Gao ◽  
Shao Jie Li ◽  
Zhi Jian Hou
Keyword(s):  
Current Density ◽  
High Performance ◽  
Experimental Studies ◽  
Cathode Current Density ◽  
Diamond Wire ◽  
Wire Saw ◽  
Diamond Wire Saw ◽  
Cathode Current ◽  
The Wire ◽  
Electroplating Process

Development of high performance diamond impregnated wire is the key of application for fixed-abrasive wire sawing technology. In this paper, some experimental studies were done for development of electroplated diamond wire saw by employing the bright nickel bath. The wire saw electroplating process was developed, the effects of cathode current density and time at tack-on stage on diamond grits density and adhesion between saw matrix and plating coating were discussed. The wire saw cutting experiments were carried out for analysis the used wire wear using the scanning electron microscope (SEM). The experimental results show the optimum tack-on current density to obtain the wire saw with good abrasive distribution and adhesion is 1.5~2.0A/dm2, and the time of pre-plating, tack-on and buildup is 6, 8~10 and 18min in turn. Diamond wire saw wear includes coating wear and grain-abrasion, and the primary wear form is grits pulled-out.

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.

Preparation of High-Purity Titanium by Molten-Salt Electrolysis Process

2011 ◽  
Vol 284-286 ◽  
pp. 1477-1482 ◽  
Author(s):  
Tie Chui Yuan ◽  
Qi Gang Weng ◽  
Zhi Hui Zhou ◽  
Jian Li ◽  
Yue Hui He
Keyword(s):  
Molten Salt ◽  
Current Density ◽  
High Purity ◽  
Titanium Sponge ◽  
Cathode Current Density ◽  
Titanium Concentration ◽  
Titanium Plate ◽  
Molten Salt Electrolysis ◽  
Cathode Current ◽  
Purity Titanium

Titanium sponge is used as anode, titanium plate as cathode and NaCl-KCl-TiClx molten salt as electrolyte, to prepare high purity titanium by molten-salt electrolysis at 900~980°C. The effects of feeding TiCl4 temperature, electrolytic temperature, soluble titanium concentration and cathode current density on the content of impurities of cathode products have been studied. The results show that the impurities in product can be controlled when the temperature of feeding and electrolyte is higher. The final product with different morphology and degree of purity can be prepared by controlling the soluble titanium concentration and cathode current density.

Study of Properties of Ni-Base Nano-ZrO2 Composite Plating Coatings

2011 ◽  
Vol 239-242 ◽  
pp. 1452-1456
Author(s):  
Lei Zhang ◽  
Ben Liang Sun ◽  
Lin Wang ◽  
Yang Xu ◽  
Yang Li ◽  
...  
Keyword(s):  
Current Density ◽  
Base Alloy ◽  
Bath Temperature ◽  
Cathode Current Density ◽  
Copper Plate ◽  
Optimum Process ◽  
Optimum Process Parameter ◽  
Composite Plating ◽  
Cathode Current ◽  
Plating Layer

The surface of copper plate of the mold need to be reinforced to obtain the plating coatings with high hardness and corrosion resistant properties. Nowadays, Ni-base alloy coatings is used widely in the industrial production. In order to raise the service life of mold, the experiments on the property of Ni-base nano ZrO2 composite plating coatings was done in this paper. The experiments were planned with the orthogonal test design method. The effective factors on the property of coatings, bath temperature, cathode current density, the distance between two electrodes and the magnitude of Nano-ZrO2,were experimentally studied. The optimum process parameter were obtained. The results show that the composite plating layer of Ni-base Nano ZrO2 with good properties can be obtained.The optimal conditions are as follows: the bath temperature is 40 °C, cathode current density is 3A/dm2, the distance between two electrodes is 12 cm, the magnitude of Nano-ZrO2 is 12g/L. In addition binding strength of the coatings were measured quantitatively, and the structure of the plating layer were observed with SEM. The layer with good properties can be obtained in this method.

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