Electrodeposition
Mostrando 25-36 de 128 artigos, teses e dissertações.
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25. Biofuncionalización de Ti6Al4V mediante crecimiento de nanoestructuras de TiO 2 con contenido de calcio y fósforo
ABSTRACT In this work the effect of the electrodeposition of calcium phosphate on TiO2 nanostructures was evaluated. For that, TiO2 nanostructures were developed in a solution of NH4F and NH4H2PO4 on Ti6Al4V substrates and subsequent cathodic electrodeposition was performed using Ca(NO3)2 and (NH4)2HPO4 as electrolyte. The surface morphology was observed by
Matéria (Rio J.). Publicado em: 2016-09
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26. Fabrication and High Temperature Friction Behavior and Oxidation Resistance of Ni-Co-ZrO2 Composite Coating
Ni-Co alloy and ZrO2 micron particles were codeposited on 45 carbon steel by electrodeposition. The composition and microstructure of the composite coating were characterized. The high temperature tribological properties were carried out by a pin-on-disk tribo-tester. Additionally, the oxidation resistance was evaluated via high temperature circulating oxida
Mat. Res.. Publicado em: 05/04/2016
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27. ELETRODOS DE FTO MODIFICADOS POR ELETRODEPOSIÇÃO DIRETA DE OURO: PRODUÇÃO, CARACTERIZAÇÃO E APLICAÇÃO COMO SENSOR ELETROQUÍMICO
Chemically modified electrodes have been studied to obtain new and better electrochemical sensors. Transparent conductive oxides, such as fluorine-doped tin-oxide (FTO), shows electrical conductivity comparable to metals and are potential candidates for new sensors. In this work, FTO was modified by gold electrodeposition from chlorine-auric acid solution us
Quím. Nova. Publicado em: 2016-02
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28. Mechanical Behavior of Electrodeposited Bulk Nanocrystalline Fe-Ni Alloys
Bulk nanocrystalline Fe-Ni alloys with Ni content of 40-55 at.%, grain size of 12-15 nm, and hardness of 3.9-4.6 were prepared by an electrodeposition. The decrease in the hardness values as grain size decreased was discussed in terms of grain refinement effect, solid solution strengthening, and grain boundary relaxation strengthening. It was found that the
Mat. Res.. Publicado em: 17/11/2015
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29. Influencia de la porosidad en las propiedades magnéticas de arreglos de nanohilos de Ni
ABSTRACTThe hysteresis properties of ordered arrays of Ni nanowires, electrodeposited into cylindrical nanoporous alumina membranes were investigated. The effect of the nanowire geometry (diameter and length), the array order and the nanowires' volume fraction on the array coercivity and remanence were analyzed. Porous alumina membranes were produced by a tw
Matéria (Rio J.). Publicado em: 2015-09
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30. Synthesis of Poly (2,5-dimethoxyaniline) and Electrochromic Properties
Poly(2,5-dimethoxyaniline) (PDMA) was synthesized using electrochemical polymerization of DMA in oxalic acid. The PDMA film coated onto ITO glass was studied for its chemical structure, morphology, electro-deposition, and electro-activity by FT-IR, TGA, SEM, cyclic voltammetry, and UV-Vis spectrophotometry. The PDMA film showed reversible color changes from
Mat. Res.. Publicado em: 25/08/2015
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31. ELETRORRECUPERAÇÃO DE COBRE UTILIZANDO REATOR ELETROQUÍMICO DE LEITO DE JORRO
In this work, copper electrowinning using a three-dimensional spouted-bed electrode (SBE) was studied in order to investigate the effects of current density (i), concentration of supporting electrolyte (Cs), pH, electrolyte temperature, and bed thickness on the process current efficiency (EC), energy consumption (CE) and space-time yield (Y). The results
Quím. Nova. Publicado em: 2015-06
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32. Corrosion and Wear Resistance of Carbon Films Obtained by Electrodeposition on Ferritic Stainless Steel
In improving the corrosion and hardness proprieties of ferritic stainless steel, the use of protective coatings becomes an interesting alternative. In this study, a carbon layer was deposited on AISI 430 by electrodeposition using N,N-dimethylformamide with the addition of an organic dopant as the electrolyte. The AISI 430 stainless steel was pretreated by a
Mat. Res.. Publicado em: 2015-04
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33. Corrosion Behavior of Coarse- and Fine-Grain Ni Coatings Incorporating NaH2PO4.H2O Inhibitor Treated Substrates
Plain carbon steel substrates were treated with NaH2PO4.H2O inhibitor for 24 hours and coated with Ni using dc and pulse electrodeposition in standard Watt’s bath. The effect of dc and pulse electrodeposition, on the microstructure and corrosion properties of Ni coatings in 3.5 wt% NaCl solution was studied. The effect of inhibitor on the deposition proces
Mat. Res.. Publicado em: 2015-02
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34. Electrodeposition of Cobalt Rich Zn-Co alloy Coatings from Citrate Bath
Zn-Co alloy coatings were produced on carbon steel, at room temperature, from citrate baths (0.100 mol L-1) containing [Zn2+]= [Co2+] = 0.05 mol L-1. Coatings with %m/m Co > %m/m Zn were observed under all deposition conditions, except for I = 10 A m-2. As the current density (I) was increased, a significant decrease (p<0.05) in %m/m Zn was noted, and the hi
Mat. Res.. Publicado em: 01/07/2014
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35. Proposed model for biomineralization of novel nanohydroxyapatite/vertically aligned multiwalled carbon nanotube scaffolds
For the first time, the growth mechanism of biominerals formed on plate-like nanohydroxyapatite (nHAp) electrodeposited on superhydrophilic vertically aligned multi-walled carbon nanotubes (VAMWCNT-O2) is presented and a model for the specific growth preference is discussed. VAMWCNT-O2 films were obtained by microwave-assisted chemical vapor deposition metho
Mat. Res.. Publicado em: 08/03/2013
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36. ZnO electrodeposition onto gold from recordable compact discs and its use as photocatalyst under solar irradiation
A ZnO film was electrodeposited onto a gold substrate obtained from a recordable compact disc and tested as photocatalyst in degradation of dye in aqueous solution. X-ray diffractometry and atomic force microscopic analysis showed a pure ZnO phase with particle sizes in the nanometric scale. The results showed that the photocatalytic activity of the film is
Braz. J. Chem. Eng.. Publicado em: 2013-03