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.

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.

Forming Mechanism of Composite Coating with Nano-Particles and its Wear Resistance

2013 ◽  
Vol 281 ◽  
pp. 500-504 ◽  
Author(s):  
Xue Song Li ◽  
Long Sheng He ◽  
You Yang
Keyword(s):  
Composite Coating ◽  
Composite Coatings ◽  
Pure Copper ◽  
Copper Substrate ◽  
Nano Particles ◽  
Nano Composite ◽  
Forming Mechanism ◽  
Nickel Coatings ◽  
Electrodeposited Nickel ◽  
Nanometer Particles

Ni-SiC nano composite coatings were prepared on pure copper substrate. The surface morphology and distribution of nanometer particles of the composite coatings were observed by scanning electron microscope (SEM), micro-hardness of coatings was tested by HXD-1000 microharder. The results showed that microstructure of Ni-SiC nano composite coating is different from that of electrodeposited nickel coatings. Its electrodepositing process abided by the principal of adsorption. By adding nanometer particles, the structure of composite coatings can be effectively fined, microhardness of composite coatings is improved apparently by comparing with that of electrodeposited nickel coatings. Abrasion resistance of Ni-SiC nano composite coatings is excellent.

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.

Deposition Mechanism and Wear Resistance Nano Ni-Al2O3 Composite Coatings

2013 ◽  
Vol 281 ◽  
pp. 409-412 ◽  
Author(s):  
Dong Mei Jiang ◽  
Ying Shen ◽  
Wei Jun Zhang ◽  
Tie Jun Liu
Keyword(s):  
Wear Resistance ◽  
Composite Coatings ◽  
Pure Copper ◽  
Copper Substrate ◽  
Nano Particles ◽  
Deposition Mechanism ◽  
X Ray ◽  
Nickel Coatings ◽  
Electrodeposited Nickel ◽  
Microhardness Tester

Nano Ni-Al2O3 composite coatings were prepared on pure copper substrate. The surface morphology and distribution of nano-particles of coatings were observed by SEM, the components of the coatings analyzed by X-ray diffractometer, and the microhardness of coatings tested by HXD-1000 microhardness tester. The microstructure of nano Ni-Al2O3 composite coating was different from that of the electrodeposited nickel coatings. The inserted Al2O3 particle can effectively hinder the growth of crystals. The microhardness of composite coatings around the inserted particles was much higher than that of electrodeposited nickel coatings. The more the size of Al2O3 decreased, the more the microhardness and wear resistance of the composite coatings increased.

Tribological Properties of Al2O3 Particles Reinforced Ni-P Composite Coating

2017 ◽  
Vol 739 ◽  
pp. 148-151
Author(s):  
Chih I Hsu ◽  
Kung Hsu Hou ◽  
Ming Der Ger
Keyword(s):  
Wear Resistance ◽  
Composite Coating ◽  
Composite Coatings ◽  
Deposition Process ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Heat Treated ◽  
Composite Deposits ◽  
Electroless Ni ◽  
Improve Wear Resistance

In this study, hardness and wear resistance of electroless Ni–P and Ni–P/Al2O3 composite coating have been investigated. These composite coatings are applied on iron substrate by electroless deposition process and then they were heat treated at 400°C for 1h. Surface and cross-section morphology of composite deposits have been investigated by scanning electron microscopy (SEM) and microstructural changes were evaluated by X-ray diffraction (XRD) analysis. The results showed that the Al2O3 particles co-deposited in Ni–P matrix led to an increase in the hardness and improve wear resistance, especially when the heat treated at 400°C will have the maximum hardness and wear resistance.

scholarly journals Ecofriendly Isolation of Cellulose from Eucalyptus lenceolata: A Novel Approach

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Noor Rehman ◽  
Sultan Alam ◽  
Noor Ul Amin ◽  
Inamullah Mian ◽  
Hidayat Ullah
Keyword(s):  
Infrared Spectroscopy ◽  
Structural Changes ◽  
Analytical Techniques ◽  
Alkaline Treatment ◽  
X Ray Diffraction ◽  
Cellulose Pulp ◽  
Novel Approach ◽  
Multistep Process ◽  
Multistep Procedure ◽  
High Degree

This study reports the extraction of cellulose by means of an environment-friendly multistep procedure involving alkaline treatment and totally chlorine-free bleaching. The multistep process begins with the removal of pectin, cutin, waxes, and other extractives from Eucalyptus lenceolata straw, followed by the removal of hemicelluloses and lignin using an alkaline treatment, and lastly by further delignification of the cellulose pulp through a two-step bleaching process, first with the use of hydrogen peroxide/tetraacetylethylenediamine (TAED) and then with the use of a mixture of acetic and nitric acids. The Eucalyptus lenceolata samples were collected from the mountains of the Malakand division of Khyber Pakhtunkhwa, Pakistan and were ground into smaller particles. The pulp resulting from each step was characterized by infrared spectroscopy (ATR-FTIR) to detect structural changes. The purified cellulose was characterized through different analytical techniques such as Fourier transfer infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The isolated cellulose has a high degree of purity and crystallinity (73%) and thermal stability as verified by XRD and TGA, respectively. SEM was used to study the surface morphology of cellulose, indicating that the surface was free from lignin and hemicelluloses due to the chemical treatment. This study indicates that the multistep procedure is quite adequate for the extraction of cellulose.

Preparation and Properties of CaCu3Ti4O12 Thick Film by Aerosol Deposition Method

2008 ◽  
Vol 368-372 ◽  
pp. 126-128
Author(s):  
Ji Feng Ma ◽  
Yuan Hua Lin ◽  
Ce Wen Nan ◽  
Takaaki Tsurumi
Keyword(s):  
Thick Film ◽  
Thick Films ◽  
Copper Substrate ◽  
Aerosol Deposition ◽  
Deposition Method ◽  
X Ray Diffraction ◽  
Ceramic Powders ◽  
Aerosol Deposition Method ◽  
Reaction Processing ◽  
Deposited Films

CaCu3Ti4O12 (CCTO) ceramic thick films have been prepared on Copper substrate, using ceramic powders by an aerosol deposition method (ADM). The ceramic powders are prepared by traditional solid state reaction processing at 1100 oC for 5 h. X-ray diffraction and scanning electron microscopy are used to investigate the microstructure and the phase composition of the deposited films. The results indicate that thick films are pure CCTO phase and homogenous. The dielectric impedance spectra indicate that the dielectric constant of CCTO thick film can reach 3×103.

The Use of Advanced Analytical Techniques for Characterization of the Chemical, Physical, and Crystallographic Nature of a Surface

1973 ◽  
Vol 31 ◽  
pp. 132-133 ◽  
Author(s):  
R. E. Herfert
Keyword(s):  
Surface Characterization ◽  
Analytical Techniques ◽  
X Ray Diffraction ◽  
Depth Of Penetration ◽  
X Ray ◽  
The Past ◽  
Transmission Electron ◽  
Scanning Electron

Studies of the nature of a surface, either metallic or nonmetallic, in the past, have been limited to the instrumentation available for these measurements. In the past, optical microscopy, replica transmission electron microscopy, electron or X-ray diffraction and optical or X-ray spectroscopy have provided the means of surface characterization. Actually, some of these techniques are not purely surface; the depth of penetration may be a few thousands of an inch. Within the last five years, instrumentation has been made available which now makes it practical for use to study the outer few 100A of layers and characterize it completely from a chemical, physical, and crystallographic standpoint. The scanning electron microscope (SEM) provides a means of viewing the surface of a material in situ to magnifications as high as 250,000X.

On the Properties of an Ion Conductive System Incorporated in Hybrid Films

2000 ◽  
Vol 628 ◽  
Author(s):  
G. González ◽  
P. J. Retuert ◽  
S. Fuentes
Keyword(s):  
Electrochemical Impedance ◽  
Ternary Phase Diagram ◽  
Lithium Perchlorate ◽  
Molar Ratio ◽  
Ionic Conductors ◽  
X Ray Diffraction ◽  
Poly Ethylene Oxide ◽  
Ion Conducting ◽  
Poly Ethylene ◽  
High Degree

ABSTRACTBlending the biopolymer chitosan (CHI) with poly (aminopropilsiloxane) oligomers (pAPS), and poly (ethylene oxide) (PEO) in the presence of lithium perchlorate lead to ion conducting products whose conductivity depends on the composition of the mixture. A ternary phase diagram for mixtures containing 0.2 M LiClO4 shows a zone in which the physical properties of the products - transparent, flexible, mechanically robust films - indicate a high degree of molecular compatibilization of the components. Comparison of these films with binary CHI-pAPS nanocomposites as well as the microscopic aspect, thermal behavior, and X-ray diffraction pattern of the product with the composition PEO/CHI/pAPS/LiClO4 1:0.5:0.6:0.2 molar ratio indicates that these films may be described as a layered nanocomposite. In this composite, lithium species coordinated by PEO and pAPS should be inserted into chitosan layers. Electrochemical impedance spectroscopy measurements indicate the films are pure ionic conductors with a maximal bulk conductivity of 1.7*10-5 Scm-1 at 40 °C and a sample-electrode interface capacitance of about 1.2*10-9 F.

Anionic and Cationic Redox Processes in β-Li2IrO3 and Their Structural Implications on Electrochemical Cycling in Li-Ion Cell

2019 ◽  
Author(s):  
Paul Pearce ◽  
Gaurav Assat ◽  
Antonella Iadecola ◽  
François Fauth ◽  
Rémi Dedryvère ◽  
...  
Keyword(s):  
Analytical Techniques ◽  
Charge Compensation ◽  
Coupling Mechanism ◽  
Redox Processes ◽  
Positive Electrodes ◽  
X Ray ◽  
Electrochemical Cycling ◽  
Li Ion ◽  
Electrochemical Instability ◽  
High Degree

The recent discovery of anionic redox as a means to increase the energy density of transition metal oxide positive electrodes is now a well established approach in the Li-ion battery field. However, the science behind this new phenomenon pertaining to various Li-rich materials is still debated. Thus, it is of paramount importance to develop a robust set of analytical techniques to address this issue. Herein, we use a suite of synchrotron-based X-ray spectroscopies as well as diffraction techniques to thoroughly characterize the different redox processes taking place in a model Li-rich compound, the tridimentional hyperhoneycomb β-Li2IrO3. We clearly establish that the reversible removal of Li+ from this compound is associated to a previously described reductive coupling mechanism and the formation of the M-(O-O) and M-(O-O)* states. We further show that the respective contributions to these states determine the spectroscopic response for both Ir L3-edge X-ray absorption spectroscopy (XAS) and X-ray photoemissions spectroscopy (XPS). Although the high covalency and the robust tridimentional structure of this compound enable a high degree of reversibile delithiation, we found that pushing the limits of this charge compensation mechanism has significant effects on the local as well as average structure, leading to electrochemical instability over cycling and voltage decay. Overall, this work highlights the practical limits to which anionic redox can be exploited and sheds some light on the nature of the oxidized species formed in certain lithium-rich compounds.<br>

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