scholarly journals Influence of Double-Pulse Electrodeposition Parameters on the Performance of Nickel/Nanodiamond Composite Coatings

Coatings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1068
Author(s):  
Dongai Wang ◽  
Meihua Liu ◽  
Yuanmin Zhu ◽  
Feihui Li
Keyword(s):  
Duty Cycle ◽  
Composite Coatings ◽  
Research Work ◽  
Working Time ◽  
Double Pulse ◽  
Pulse Electrodeposition ◽  
Composite Plating ◽  
Surface Micromorphology ◽  
Reverse Pulse ◽  
Plating Solution

In this study, using 45# carbon steel as the substrate, a first experimental analysis was carried out on the polarisation behaviour of different component wattage plating solutions in order to determine the reasonable content of nanodiamond particles in a nickel/nanodiamond composite plating solution. Secondly, the effect of double-pulse forward and reverse duty cycle and reverse working time on the performance of nickel/nanodiamond composite plating was then investigated by testing the thickness, hardness and surface roughness of the composite plating and observing the surface micromorphology. The experimental results show that, when the content of nanodiamond particles in the plating solution is 5 g/L, the anti-pulse working time, forward and reverse pulse duty cycle of the double-pulse plating parameters are 20, 0.3 and 0.2 ms, respectively, and the composite plating layer prepared by double pulse has good comprehensive performance. This research work provides technical support for the optimisation of process parameters for the preparation of nickel/nanodiamond composite coatings by double-pulse electrodeposition.

Electroless Ni-P-PTFE Composite Coatings on Titanium Alloy and Their Tribological Properties

2011 ◽  
Vol 291-294 ◽  
pp. 12-17 ◽  
Author(s):  
Zhong Dong Yang ◽  
Di Wu ◽  
Meng Fei Liu
Keyword(s):  
Titanium Alloy ◽  
Friction And Wear ◽  
Composite Coatings ◽  
Wear Properties ◽  
Ptfe Composite ◽  
Composite Plating ◽  
Lubricating Property ◽  
Plating Solution ◽  
Friction And Wear Properties ◽  
Electroless Ni

In this study, it was the first attempt to fabricate Ni-P-PTFE composite coatings on titanium alloy (manufactured through electroless composite plating). The effects of suspended PTFE concentration, temperature and surfactant concentration in the plating solution on the PTFE content in the resulting coatings were investigated. In addition, the friction and wear properties of the samples were analyzed. The results showed that co-deposition of Ni-P and PTFE can obviously decrease the friction coefficient of the coatings, reduce wear and improve lubricating property of the coatings.

Study on Dispersion of Carbon Nanotubes in Pb-Sn Electroplating Bath

2015 ◽  
Vol 778 ◽  
pp. 168-173
Author(s):  
Zheng Xi Hu ◽  
Xiao Hua Jie
Keyword(s):  
Carbon Nanotubes ◽  
Friction Coefficient ◽  
Milling Time ◽  
Composite Coatings ◽  
Volume Percent ◽  
Composite Plating ◽  
Friction Tester ◽  
Disperse Carbon ◽  
Plating Solution ◽  
Ball Milling Time

In order to get homogeneously dispersed carbon nanotubes suspension for composite plating, carbon nanotubes were ball milled for different times and polycyclic acid (PA) was used as dispersant in this work. Sedimentation ratio was calculated by measuring the absorbance of suspensions and friction coefficient of the composite coatings was measured by friction tester. Dispersant content and ball milling time on the dispersive stability of suspension were studied. The dispersion mechanisms were discussed. The results showed that PA could effectively disperse carbon nanotubes in Pb-Sn electroplating solution. When the volume percent of PA was 0.3%, milling time was 6h and the milling speed was 300r/min, the sedimentation ratio was the smallest. The composite coatings had the smallest friction coefficient. Besides, the mechanism of PA effectively dispersing CNTs in Pb-Sn electro plating solution was electrostatics stabilization.

A Study on the Ni-P-SiC Coating of AZ91D Magnesium Alloy

2010 ◽  
Vol 43 ◽  
pp. 510-513 ◽  
Author(s):  
Xiao Lan Ge ◽  
Bing Zeng ◽  
Zhi Chao Chen ◽  
Duo Wei ◽  
Cai Jun Wang
Keyword(s):  
Wear Resistance ◽  
Magnesium Alloy ◽  
Phase Particle ◽  
Composite Coatings ◽  
Second Phase ◽  
Az91d Magnesium Alloy ◽  
Composite Plating ◽  
Before And After ◽  
Plating Solution ◽  
Better Than

An Investigation on the Ni-P-SiCp Electroless Composite Plating of AZ91D magnesium alloy was investigated.The morphology and phase structrue of the electroless composite plating were investigated by means of SEM and XRD.The effect of concentration of the second phase particle in electroless plating solution on wear resistance of the Ni-P-SiCp composite coating were studied.The properties of the coatings before and after heat treatment were compared.The result shows that the obtained coatings were flat and compact.X-ray diffractometry indicated that the coatings were amorphous,but crystallization would happen in the process of heat treatment.From the lost weight of the coatings it can be seen that the wear resistance of composite coatings was better than that of Ni-P coatings .

scholarly journals Influence of Pulse Current Forward-Reverse Duty Cycle on Structure and Performance of Electroplated W–Cu Composite Coatings

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1233
Author(s):  
Yuchao Zhao ◽  
Nan Ye ◽  
Haiou Zhuo ◽  
Chaolong Wei ◽  
Weiwei Zhou ◽  
...  
Keyword(s):  
Composite Coating ◽  
Duty Cycle ◽  
Electrode Materials ◽  
Pulse Current ◽  
Electrical Discharge Machining ◽  
Composite Coatings ◽  
Electrical Contact ◽  
Pulse Plating ◽  
Fusion Welding ◽  
Raw Material

Tungsten-copper (W–Cu) composites are widely used as electrical contact materials, resistance welding, electrical discharge machining (EDM), and plasma electrode materials due to their excellent arc erosion resistance, fusion welding resistance, high strength, and superior hardness. However, the traditional preparation methods pay little attention to the compactness and microstructural uniformity of W–Cu composites. Herein, W–Cu composite coatings are prepared by pulse electroplating using nano-W powder as raw material and the influence of forward-reverse duty cycle of pulse current on the structure and mechanical properties is systematically investigated. Moreover, the densification mechanism of the W–Cu composite coating is analyzed from the viewpoints of forward-pulse plating and reverse-pulse plating. At the current density (J) of 2 A/dm2, frequency (f) of 1500 Hz, forward duty cycle (df) of 40% and reverse duty cycle (dr) of 10%, the W–Cu composite coating rendered a uniform microstructure and compact structure, resulting in a hardness of 127 HV and electrical conductivity of 53.7 MS/m.

The Influences of the Plating’s Hardness, Abrasion and Antifriction Property Caused by the Adding of Nano- Al2O3 and PTFE

2012 ◽  
Vol 557-559 ◽  
pp. 1683-1686 ◽  
Author(s):  
Xiao Feng Xu ◽  
Wen Bin Yao ◽  
Jiu Hua Xu ◽  
Wei Zhang ◽  
Lin Yang ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Antifriction Property ◽  
Chemical Plating ◽  
Composite Plating ◽  
Plating Solution ◽  
Alloy Plating

Composite plating Ni-P-PTFE- nano- Al2O3was made by adding nano-scaled Al2O3and PTFE into chemical plating Ni-P alloy plating solution. The influences of the plating material’s hardness, abrasion and antifriction property caused by the additive amount of nano- Al2O3and PTFE were studied in the paper. The results indicate that the composite plating’s hardness, wear resistance and antifriction can be greatly improved by adding nano- Al2O3and PTFE into it.

scholarly journals Influence of Chromium Concentration on the Abrasive Wear Of Ni-Cr-B-Si Coatings Applied by High-Velocity Oxygen Fuel

2021 ◽  
Author(s):  
Zhetcho Doinov Kalitchin ◽  
Mara Krumova Kandeva ◽  
Yana Petrova Stoyanova
Keyword(s):  
Wear Resistance ◽  
Thermal Treatment ◽  
High Velocity ◽  
Composite Coatings ◽  
Research Work ◽  
Wear Intensity ◽  
High Velocity Oxygen Fuel ◽  
Preliminary Thermal Treatment ◽  
Cr Concentration ◽  
Oxygen Fuel

This research work studies the characteristics of wear and wear resistance of composite powder coatings, deposited by high-velocity oxygen fuel, which contain composite mixtures Ni-Cr-B-Si having different chromium concentrations – 9.9%; 13.2%; 14%; 16% and 20% , at one and the same size of the particles and the same content of the remaining elements. The coating of 20% Cr does not contain B and Si. Out of each powder, composite coatings have been prepared without any preliminary thermal treatment of the substrate and with preliminary thermal treatment of the substrate up to 650оС. The coatings have been tested under identical conditions of dry friction over a surface of solid firmly attached abrasive particles using the tribological testing device „Pin-on-disk“. Results have been obtained and the dependences of the hardness, mass wear, intensity of the wearing process, absolute and relative wear resistance on the Cr concentration under identical conditions of friction. It has been found out that for all the coatings the preliminary thermal treatment of the substrate leads to a decrease in the wear intensity. Upon increasing Cr concentration the wear intensity diminishes and it reaches minimal values at 16% Cr. In the case of coatings having 20% Cr concentration, the wear intensity is increased, which is due to the absence of the components B and Si in the composite mixture, whereupon no inter-metallic structures are formed having high hardness and wear resistance. The obtained results have no analogues in the current literature and they have not been published by the authors.

scholarly journals Electrodeposition of Co-B/SiC Composite Coatings: Characterization and Evaluation of Wear Volume and Hardness

Coatings ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 279 ◽  
Author(s):  
A. Villa-Mondragón ◽  
A. Martínez-Hernández ◽  
F. Manríquez ◽  
Y. Meas ◽  
J. J. Pérez-Bueno ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Composite Coatings ◽  
Research Work ◽  
Colloidal Suspensions ◽  
Wear Volume ◽  
X Ray Diffraction ◽  
Homogeneous Composition ◽  
Different Content ◽  
Sic Coatings ◽  
Hardness Values

In this research work, Co-B/SiC composite coatings were synthesized by electrochemical deposition from colloidal suspensions with different content of SiC. The Co-B/SiC films obtained were heat treatment at 350 °C. The composition, morphology, and structure of the Co-B/SiC composite coatings were analyzed using glow discharge spectrometry (GDS), scanning electron microscopy (SEM) coupled with energy-dispersive spectroscopy (EDS), and X-ray diffraction (XRD). Hardness and tribological properties were also studied. The results showed that an increase in the SiC concentration in the colloidal suspensions resulted in both an increase in the SiC content and a decrease in the B content in the obtained Co-B/SiC coatings. The Co-B/SiC coatings were adherent, glossy, and soft, and exhibited a homogeneous composition in all thicknesses. Besides, an increase in the SiC particle content of the Co-B/SiC composite coating from 0 to 2.56 at.% SiC reduced the hardness of the film from 680 to 360 HV and decreased the wear volume values from 1180 to 23 μm3 N−1 m−1, respectively (that is, the wear resistance increased). Moreover, when the Co-B/SiC coatings with SiC content ranging from 0 to 2.56 at.% SiC were subjected to a heat treatment process, the obtained coating hardness values were in the range of 1200 to 1500 HV, and the wear volume values were in the range of 382 to 19 μm3 N−1 m−1.

SiC Particles Concentration Dependent the Properties of Electroless Ni-P-SiC Coatings

2012 ◽  
Vol 457-458 ◽  
pp. 146-149
Author(s):  
Yan Hai Cheng ◽  
Shi Ju Zhang ◽  
Yu Xing Peng ◽  
Fang Fang Xing ◽  
Jie Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Particle Concentration ◽  
Composite Coatings ◽  
Sic Particles ◽  
Plating Solution ◽  
Electroless Ni ◽  
Sic Coatings ◽  
Scanning Electron ◽  
Sic Particle

In this study, Ni-P-SiC composite coatings were prepared by adding different amount of SiC particles into electroless Ni-P plating solution. The effects of SiC particles concentration in solution on depositing rate and composition of the coatings were investigated. The different SiC contents in coatings could be obtained by adjusting the amount of SiC particle concentration in electroless plating solution. Scanning electron microscopy (SEM) results indicate that SiC particles are dispersed in the composite coating and Ni-P alloy is mainly as a bond metal envelope with SiC particles. At the same time, the microhardness became increased and the wear resistance improved with the increasing of SiC content.

Influence of cathodic duty cycle on the properties of tungsten containing Al 2 O 3 /TiO 2 PEO nano-composite coatings

2018 ◽  
Vol 340 ◽  
pp. 210-221 ◽  
Author(s):  
Amin Hakimizad ◽  
Keyvan Raeissi ◽  
Mohammad Ali Golozar ◽  
Xiaopeng Lu ◽  
Carsten Blawert ◽  
...  
Keyword(s):  
Duty Cycle ◽  
Composite Coatings ◽  
Nano Composite
Sign in / Sign up

Export Citation Format

Share Document