scholarly journals Parametric Variables in Electro-deposition of Composite Coatings

10.5772/62010 ◽  
2016 ◽  
Author(s):  
Peter Odetola ◽  
Patricia Popoola ◽  
Olawale Popoola ◽  
David Delport
Keyword(s):  
Composite Coatings ◽  
Electro Deposition

Effect of Deposition Mechanism and Microstructure of Nano-Ceria Oxide Addition on Ni-P Coating by Pulse Electrodeposition

2011 ◽  
Vol 326 ◽  
pp. 151-156 ◽  
Author(s):  
Xiao Wei Zhou ◽  
Yi Fu Shen ◽  
Hui Ming Jin
Keyword(s):  
Electron Microscopy ◽  
Composite Coatings ◽  
Amorphous State ◽  
Deposition Mechanism ◽  
Electro Deposition ◽  
Precipitated Phase ◽  
Oxide Addition ◽  
Transmission Electron ◽  
Ceria Oxide ◽  
Defective Area

Pulse current (PC) electro-deposition combined with the ultrasonic (U) field has been used to fabricate pure nickel and nickel-ceria composite coatings. Morphology, ceria (RE) composite, and crystal-texture were observed and analyzed by using environment scanning electron microscopy equipped with energy dispersive X-ray analysis (ESEM/EDAX) and transmission electron microscopy (TEM). Experimental results indicate that it produced the alloying coatings, exhibiting compact grain and be of amorphous state. Nano-sized RE would preferentially occupy and pad the defective area between the cracked gap and micropores to limit the growth of the original Ni grain, and far from coarse grain. Furthermore, during annealed at 500 °C for 2 h, dispersing a solid-solution precipitated phase named NiCexO1-x (0<x<0.5), it would make diffused sufficiently to promote densification and microhardness greatly.

Microstructure and High-Temperature Oxidation of Ni-Si3N4 Composite Coatings by Pulse Electrodeposition

2015 ◽  
Vol 817 ◽  
pp. 421-425
Author(s):  
Kun Zhao ◽  
Wan Chang Sun ◽  
Chun Yu Miao ◽  
Hui Cai ◽  
Ju Mei Zhang ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
High Temperature ◽  
Oxidation Resistance ◽  
High Temperature Oxidation ◽  
Composite Coatings ◽  
X Ray Diffraction ◽  
Temperature Oxidation ◽  
Electro Deposition ◽  
X Ray ◽  
Crystallite Structure

Nickel matrix and Si3N4 micron particles were co-deposited on the aluminum alloy by pulse electro-deposition for high temperature performance. Meanwhile, the oxidation resistance was evaluated through the high temperature oxidation test. The phase structure, micrographs and components of the composite coatings were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM) together with energy dispersive spectroscopy (EDS) respectively. The results indicated that Si3N4 particles were uniformly distributed across the coating and there were no pores and cracks or other defects at the coating/substrate interface. Ni-Si3N4 composite coatings are characterized by pyramidal micro-crystallite structure. The thickness of Ni-Si3N4 composite coatings were up to 80 μm for 2h. The results also revealed that the Ni-Si3N4 composite coatings presented better oxidation resistance than the pure Ni coating and aluminum alloy at high temperature. After oxidation at 673 K for 8h, the oxidation resistance of Ni-Si3N4 composite coatings presented the improved oxidation resistance behavior compared to pure Ni and the aluminum alloy, respectively.

Corrosion Behavior of Electrodeposited Nickel Coating Reinforced by Cr2O3 Particles

2021 ◽  
Vol 406 ◽  
pp. 203-218
Author(s):  
Saida Marmi ◽  
Shahnaz Siad ◽  
Abdelouahad Chala ◽  
Hayat Marmi
Keyword(s):  
Composite Coatings ◽  
Copper Substrate ◽  
Analytical Techniques ◽  
X Ray Diffraction ◽  
Electro Deposition ◽  
Corrosion Tests ◽  
Electrodeposited Nickel ◽  
Composite Deposits ◽  
High Degree ◽  
Deposited Films

The objective of this work is the characterisation of the composite deposits Ni-Cr2O3 on copper substrate; these deposits are obtained from bath of electro-deposition of Nickel watts. The different electrodeposited layers are characterized by various analytical techniques such as adhesion quality, corrosion tests, Vickers microhardness, morphology by scanning electron microscopy Followed by EDX microanalysis and X-ray diffraction. The corrosion tests are realized in a solution of 3.5 % NaCl using lost mass method, polarization and impedance spectroscopy techniques. It was found that the composite coatings Ni-Cr2O3 have an homogeneous and compact morphology, well crystallized and exhibit a high degree of codeposition of Cr2O3 particles incorporated in the nickel matrix. The co-deposited films have very good hardness, adhere perfectly to the substrate and are more resistant to corrosion.

Preparation of Metal-Gr Composite Coatings via Electro-Plating for High Performances: A Review

MRS Advances ◽  
2019 ◽  
Vol 4 (35) ◽  
pp. 1913-1928
Author(s):  
Sishi Li ◽  
Yanpeng Yang ◽  
Gongsheng Song ◽  
Qiang Fu ◽  
Chunxu Pan
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Large Scale ◽  
Low Cost ◽  
Composite Coatings ◽  
Scale Production ◽  
Electro Deposition ◽  
Wide Range ◽  
Set Up ◽  
Wear And Corrosion Resistance

ABSTRACTDeveloping metal-based composite coatings with improved mechanical properties and good corrosion resistance has been an attractive research topic in recent years. Graphene (Gr), as a new type of two-dimensional (2D) carbon nanomaterial with excellent physical, chemical and mechanical properties, can be used as a reinforcement to improve hardness, tensile strength, wear and corrosion resistance of metal-based composites. There have been substantial efforts focused on the fabrication of metal-Gr composite coatings via various approaches. Electro-deposition is an effective electrochemical method with wide range of advantages, such as a fast deposition rate, simple set-up with large scale production and relatively low cost. This overview covers the previous research and development studies on metal-Gr composite coatings using electro-deposition method and the resulting properties. In addition, recent work in this area which provides a developed process with industrial production perspective, is discussed.

Fabrication and Performance of Ni-Co-P/Si3N4 Electroplated Composite Coatings on Al-Si Alloys

2013 ◽  
Vol 377 ◽  
pp. 235-239
Author(s):  
Yun Li ◽  
Liang Fang ◽  
Wei Dong Shen ◽  
Sheng Chun Wang ◽  
Chun Lan Cao ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Electric Current ◽  
Current Density ◽  
Composite Coatings ◽  
Adhesive Force ◽  
Optical Microscope ◽  
Electric Current Density ◽  
Electro Deposition ◽  
X Ray ◽  
Hardness Tester

In order to improve the wear resistance of Al-Si alloys, the electro deposition of Ni-Co-P/Si3N4coating on a hypereutectic Al-Si casting alloy was studied in this paper. The thickness, hardness, surface morphology, composition, adhesive force and wear resistance of Ni-Co-P/Si3N4coating were measured by optical microscope, micro-hardness tester, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), adhesive attraction scratcher and abrasion tester. It was shown that Si3N4particulates were uniformly distributed in the composite coating. And the effect of process parameters, such as electric current density, temperature, PH, plating time and component of electroplating bath,were obtained. The wear resistance of the coating was improved with the increase of hardness and the content of Si3N4in the coating. It was also improved by decreasing electric current density. The adhesion of the coating was poor for increasing the content of P and Co in the coating. At the same time, the coating was hard, friable, and easy to be broken with the decrease of temperature.

Electrodeposition of Nanostructured Ni Based Alloys/Composites – A Critical Analysis

2014 ◽  
Vol 984-985 ◽  
pp. 514-519 ◽  
Author(s):  
Manoj Mandal ◽  
Chandrabalan Sasikumar
Keyword(s):  
Corrosion Resistance ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Composite Coatings ◽  
Microstructural Investigation ◽  
Electro Deposition ◽  
Percent Increase ◽  
Co Alloys ◽  
Deposited Films ◽  
Deposition Techniques

The Ni based alloys and composites synthesized by electro-deposition techniques were investigated in this paper. The co-deposition techniques for development of Ni-Co alloys, synthesis of oxide doped nanocomposites were analyzed. The hardness, wear resistance and corrosion resistance of different coatings: Ni, Ni-Co alloys, Ni-Fe2O3,Ni-Al2O3,Ni-Fe-BN, Ni-TiN composites were studied in detail. The Ni-Fe-BN and Ni-TiN showed more than 550 percent increase in hardness of stainless steel substrate. The Hardness was found to be about 600-1180Hv for Nitride impregnated coatings. These films also showed higher corrosion resistance in comparison to other Ni based alloy and composite coatings. The microstructural investigation of these alloys showed nanostructured rods and fibres in the deposited films.

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