Electrodeposition and Thermal Treatment of Nickel Coatings Containing Cobalt

2015 ◽  
Vol 228 ◽  
pp. 158-162
Author(s):  
Magdalena Popczyk ◽  
B. Łosiewicz ◽  
Eugeniusz Łągiewka ◽  
A. Budniok
Keyword(s):  
Thermal Treatment ◽  
Absorption Spectrometry ◽  
Amorphous Structure ◽  
X Ray Diffraction ◽  
Nickel Coatings ◽  
Developed Surface ◽  
Surface Development ◽  
Multi Phase ◽  
Morphology Characterization

The Ni-P and Ni-Co-P coatings were electrodeposited at the deposition current density ofjdep= -20 mA cm-2. Thermal treatment of these coatings was conducted in air at 400oC for 1 h. Scanning electron microscopy (SEM) was used for surface morphology characterization of the coatings. Phase composition was investigated by X-ray diffraction (XRD) method. Atomic absorption spectrometry (AAS) was applied to specify chemical composition of obtained coatings. It was found that introduction of Co into amorphous Ni matrix caused the surface development of the obtained deposit. The Ni-P coating revealed an amorphous structure. The Ni-Co-P coating was formed of the amorphous matrix and the amorphous alloy ingredient. Thermal treatment of the coatings allowed to obtain new multi-phase materials with slightly developed surface.

Structure and Electrochemical Characterization of Electrolytic Ni-Co-P and Ni-W-P Layers

2006 ◽  
Vol 514-516 ◽  
pp. 460-464 ◽  
Author(s):  
Magdalena Popczyk ◽  
Antoni Budniok ◽  
Henryk Scholl ◽  
Tadeusz Blaszczyk
Keyword(s):  
Electrode Materials ◽  
Diffraction Method ◽  
Absorption Spectrometry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Developed Surface ◽  
P Matrix ◽  
Morphology Characterization ◽  
Galvanostatic Conditions

Ni-P, Ni-Co-P and Ni-W-P layers were obtained in galvanostatic conditions, at the current density jdep= 0.200 A cm-2. The X-ray diffraction method was used to determine phase composition of the layers and the atomic absorption spectrometry was applied to specify their chemical composition. A metallographic, stereoscopic and tunneling microscope and also Form Talysurf-type profilograph were used for cross-section and surface morphology characterization of the layers. The behaviour of obtained layers was investigated in the processes of hydrogen and oxygen evolution from 5 M KOH using voltammetry method. It was ascertained that, introduction of cobalt or tungsten into Ni-P matrix, lead to obtain the layers about very developed surface. Thus obtained layers may be useful in application as electrode materials in electrochemistry.

Electrochemical Characterization of Nickel-Phosphorus Based Coatings Containing Cobalt

2015 ◽  
Vol 228 ◽  
pp. 299-304
Author(s):  
Magdalena Popczyk ◽  
B. Łosiewicz ◽  
Eugeniusz Łągiewka ◽  
A. Budniok
Keyword(s):  
Electrode Materials ◽  
Electrochemical Impedance ◽  
Porous Electrode ◽  
Absorption Spectrometry ◽  
X Ray Diffraction ◽  
Morphology Characterization ◽  
Galvanostatic Conditions ◽  
Matrix Powder ◽  
Xrd Method

The Ni-P, Ni-Co-P and Ni-P+Co coatings were obtained in galvanostatic conditions at the current density ofjdep= -200 mA cm-2. A stereoscopic microscope was used for surface morphology characterization of the coatings. The X-ray diffraction (XRD) method was used to determine phase composition of the coatings and the atomic absorption spectrometry (AAS) was applied to specify their chemical composition. The behavior of the obtained coatings was investigated in the process of hydrogen evolution reaction (HER) from 5 M KOH using steady-state polarization and electrochemical impedance spectroscopy (EIS) methods. It was found that introduction into Ni-P amorphous matrix powder of cobalt produced porous electrode materials which could be used for the HER.

Electrodeposition and Thermal Treatment of Nickel Coatings Containing Molybdenum and Silicon

2006 ◽  
Vol 514-516 ◽  
pp. 1182-1185 ◽  
Author(s):  
Magdalena Popczyk ◽  
Julian Kubisztal ◽  
Antoni Budniok
Keyword(s):  
Phase Composition ◽  
Thermal Treatment ◽  
Diffraction Method ◽  
Argon Atmosphere ◽  
Nickel Matrix ◽  
Nickel Coatings ◽  
Morphology Characterization ◽  
Galvanostatic Conditions ◽  
Scanning Electron

Ni+Mo+Si coatings were obtained by electrolytic codeposition of crystalline nickel with molybdenum and silicon powders from an electrolyte containing suspension of these powders. These coatings were obtained in galvanostatic conditions, at the current density of -0.100 A cm-2. Thermal treatment of these coatings in argon atmosphere was done at temperature of 1100oC for 1 hour. A scanning electron microscope was used for surface morphology characterization of the coatings. Chemical composition of obtained coatings was determined by Xray fluorescence spectroscopy method and phase composition investigations were conducted by Xray diffraction method. It was found that introduction of molybdenum and silicon into nickel matrix, causes of obtained coatings about very rough surface. Thermal treatment of these coatings influenced their surface. The surface after thermal treatment is more compact and less rough than the as-deposited one.

Structure and Electrochemical Characterization of Ni+W+Si Composite Coatings in an Alkaline Solution

2008 ◽  
Vol 587-588 ◽  
pp. 815-819 ◽  
Author(s):  
Magdalena Popczyk ◽  
Antoni Budniok ◽  
Eugeniusz Łągiewka
Keyword(s):  
Thermal Treatment ◽  
Alkaline Solution ◽  
Composite Coatings ◽  
Electrochemical Corrosion ◽  
Nitrogen Atmosphere ◽  
X Ray Diffraction ◽  
Nickel Deposition ◽  
Electrochemical Corrosion Resistance ◽  
Morphology Characterization

Ni+W+Si composite coatings were prepared by nickel deposition from a bath containing suspension of tungsten and silicon powders. These coatings were obtained under galvanostatic conditions, at the current density of jdep. = 0.100 A cm-2 and at the temperature of 338 K. A scanning electron microscope was used for surface morphology characterization of the coatings. Chemical composition of the coatings was determined by EDS method and phase composition investigations were conducted by X-ray diffraction. Thermal treatment of obtained coatings was conducted in the air and nitrogen atmosphere. Electrochemical corrosion resistance investigations were carried out in the 5 M KOH, using potentiodynamic method. It was found that Ni+W+Si coatings after thermal treatment in the air are more corrosion resistant in alkaline solution than Ni+W+Si coatings after thermal treatment in the nitrogen atmosphere and as-deposited coatings. The main reason of this is presence of new phases, in particular NiWO4 and SiO2.

Characterization of silica polymorphs in kaolins by X-ray diffraction before and after phosphoric acid digestion and thermal treatment

2005 ◽  
Vol 552 (1-2) ◽  
pp. 201-206 ◽  
Author(s):  
Sibel Kahraman ◽  
Müşerref Önal ◽  
Yüksel Sarıkaya ◽  
İhsan Bozdoğan
Keyword(s):  
Thermal Treatment ◽  
Phosphoric Acid ◽  
Acid Digestion ◽  
X Ray Diffraction ◽  
X Ray ◽  
Before And After

Preparation and Characterization of a Novel Fluorocarbon Nano Material

2011 ◽  
Vol 236-238 ◽  
pp. 1958-1961
Author(s):  
Jian Ping Hu ◽  
Mei Yu ◽  
Jian Hua Liu ◽  
Song Mei Li ◽  
Jun Xiu Shi
Keyword(s):  
Raw Material ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
Molecule Structure ◽  
Transmission Electron ◽  
Nano Material ◽  
Dta Curves ◽  
Dta Curve ◽  
Morphology Characterization

In this article, preparation approach of a novel fluorocarbon nano material was described. The molecule structure, thermal properties and morphology characterization of the fluorocarbon nano material were studied out by Fourier transform infrared spectroscopy (FTIR), thermal gravity and differential thermal analysis (TG-DTA), transmission electron microscope (TEM) and X-ray diffraction analysis (XRD). It was showed that the basic molecule structure of the fluorocarbon nano material was same as the raw material (FKM) except that a new C=C bond was produced in the fluorocarbon nano material at 1624cm-1. It was demonstrated that the morphology of the fluorocarbon nano material was unattached particles with particle size between 40-60nm under TEM. From TG-DTA curves, it was indicated that the fluorocarbon nano material was high thermal stabile, which oxidizing decomposing temperature in air and thermal decomposing temperature in N2 were 322°C and 295°C, respectively. The XRD pattern showed that the diffraction peak of amorphous carbon was disappeared when the fluoronano material was baked in air at 350°C, and this result validates the oxidizing decomposing of the fluorocarbon nano material at 322°C of the TG-DTA curve.

Electrolytic Production and Structure of Ni+Al+Ti Composite Coatings

2015 ◽  
Vol 228 ◽  
pp. 168-171
Author(s):  
Iwona Napłoszek ◽  
Eugeniusz Łągiewka ◽  
A. Budniok ◽  
Magdalena Popczyk ◽  
Grzegorz Dercz ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Composite Coatings ◽  
X Ray Diffraction ◽  
Electrolytic Production ◽  
X Ray ◽  
Electrochemical Processes ◽  
Three Phase ◽  
Multi Phase ◽  
Galvanostatic Conditions ◽  
Xrd Method

The Ni+Al+Ti composite coatings were prepared by the electrodeposition under the galvanostatic conditions at the deposition current denisty ofjdep= -225 mA cm-2. Phase composition investigations were conducted by X-ray diffraction (XRD) method. The surface morphology, cross-section and chemical composition of the coatings were examined using a scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS), respectively. Thermal treatment of the obtained composite coatings was conducted in argon atmosphere at the temperature of 800oC for 12 h. It was found that the as-deposited Ni+28at.%Al+25at.%Ti composite coating is a three-phase material (Ni, Al and Ti phases). The thermal treatment caused the chemical reaction in solid state of the heated coating, and a new multi-phase material was formed containing Ni and Al metallic phases as well as NiAl, Ni2Al3, Ni3Al, NiTi, NiTi2and Ni3Ti intermetallic phases. Thus obtained composite coatings may be useful in the applications as materials in the electrochemical processes.

scholarly journals EFFECT OF Mn AND Ti ADDITION ON THE CRYSTALLOGRAPHIC STRUCTURE AND MAGNETIC PROPERTIES OF SrFe12O19

2020 ◽  
Vol 82 (4) ◽  
Author(s):  
Wisnu Ari Adi ◽  
Yunasfi Yunasfi ◽  
Yosef Sarwanto ◽  
Muhammad Aziz Majidi
Keyword(s):  
Magnetic Properties ◽  
Raw Materials ◽  
Site Occupancy ◽  
Crystallographic Structure ◽  
X Ray Diffraction ◽  
Mixed Powder ◽  
Total Magnetization ◽  
Multi Phase ◽  
Ti Addition

The synthesis and characterization of composition SrFe12-(x+y)MnxTiyO19 (x = y and x ≠ y) compound by using solid state reaction have been performed. The raw materials were SrCO3, Fe2O3, MnCO3, and TiO2. The mixed powder was compacted at 5000 psi into pellets and sintered at 1050°C in the air at atmosphere pressure for 15 hours and furnace cooling. The refinement results of x-ray diffraction pattern show that the doping composition (x = y) was a single phase while the doping composition (x ≠ y) was multi phase. We concluded that effect of substitution upon magnetic properties revealed that total magnetization, remanence and coercivity changed with substitution due to preferential site occupancy of substituted Mn2+ and Ti4+ ions. The coercivity decreases with increase in Mn and Ti concentration. This effect is related with Fe3+ magnetic moment changes after they have already substituted Mn2+ and Ti4+ ions. Since the coercivity and total magnetization may be controlled by substitution while maintaining resistive properties, making this material useful for microwave absorber. 

Fabrication and Characterization of Nanoscale Porous Copper Film

2012 ◽  
Vol 433-440 ◽  
pp. 683-688
Author(s):  
Liu Wei Ding ◽  
Hao Ran Geng ◽  
Jing Hua Xu
Keyword(s):  
Copper Film ◽  
Selective Dissolution ◽  
Amorphous Structure ◽  
Nanometer Scale ◽  
Copper Films ◽  
Nanocrystalline Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
Porous Copper

Cu-38Zn thin film (wt %) was deposited on the unheated microscope glass at the nanometer scale by DC magnetron sputtering. Subsequently, the nanocrystalline films were dealloyed in H2SO4 aqueous solution etching of zinc component, resulting in the formation of nanoscale porous copper film with average porous diameter of approximately 94 nm. The films microstructure and element composition were characterized by X-ray diffraction and scanning electron microscopy. The experimental results show that Cu-38Zn films are quasi-amorphous structure, porous copper film with different porous sizes is prepared by selective dissolution of zinc atoms from a nanocrystalline dual-phase film under free corrosion conditions, the grain size of the Cu-Zn films has an important effect on the dealloying process and the microstructures of the nanoscale copper films.

Characterization of Powder Metallurgy High-Entropy Alloys Prepared by Spark Plasma Sintering

2018 ◽  
Vol 941 ◽  
pp. 1053-1058 ◽  
Author(s):  
Larissa Gouvea ◽  
Igor Moravcik ◽  
Jan Cizek ◽  
Petra Krajnakova ◽  
Vít Jan ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
High Entropy Alloys ◽  
X Ray Diffraction ◽  
High Entropy ◽  
Average Hardness ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Multi Phase ◽  
Sintering Processes

In the present work, the High-Entropy Alloys Al0.2Co1.5CrFeNi1.5Ti, Al1.3Co1.4Cr2.0FeNi4.0Ti4.0 and Al6.0Co1.2Cr2.5FeNi3.5Ti6.0 were produced by Mechanical Alloying and subsequent Spark Plasma Sintering processes to obtain properly densified bulks. The characterization of the materials was accomplished through X-Ray Diffraction, Scanning Electron Microscopy, microhardness and nanoindentation tests to identify and analyze the acquired microstructures’ features, phases formed, morphology and size of the grains and its average hardness. The results indicate that it was possible to obtain alloys presenting high values of hardness and multi-phase microstructures. The effect of the multiple phases on the microstructures was discussed in terms of its influence on the mechanical properties. A satisfying densification level of the materials was achieved with the selected parameters.

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