Codeposition of SiC particles with electrolytic cobalt in the presence of Cs+ ions
TL;DR: In this paper, the influence of Cs + concentration on the cathodic polarization curves was determined in galvanostatic and potentiodynamic measurements, and the structure of the composite coatings was studied by microscopic observations.
Abstract: Electrodeposition of SiC particles with cobalt matrix in the presence of cesium ions was studied. The influence of Cs + concentration (0–37.6 mM) on the cathodic polarization curves was determined in galvanostatic and potentiodynamic measurements. It was found that the presence of Cs + in the solution enhanced adsorption of Co 2+ ions on SiC, but preferential cesium adsorption occurred simultaneously. The last phenomena resulted in cesium incorporation in the composite coating. Surface charge of SiC powder and amounts of functional groups on SiC surface were determined. The particles incorporation into deposits was only little dependent on cesium concentration in the bath. Structure of the composite coatings was studied by microscopic observations. Microhardness of the deposits was also determined.
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TL;DR: In this paper, the effect of cobalt content on electrodeposition mechanism of Ni-Co film was studied by electrochemical impedance spectroscopy method (EIS) and surface morphology and crystallographic structure of the coatings were investigated by means of SEM and XRD.
Abstract: Ni-Co coatings with various cobalt contents were electrodeposited from modified Watts bath. The effect of cobalt content on electrodeposition mechanism of the coatings was studied by electro-chemical impedance spectroscopy method (EIS). Surface morphology and crystallographic structure of the coatings were investigated by means of SEM and XRD. Mechanical properties of the coatings were determined using Vickers microhardness and tensile tests. It was found that with increasing the Co 2+ ions in electroplating bath, the charge transfer resistance ( R ct ) of Ni–Co film increased whereas the Warburg impedence decreased. This may be due to enhancement in coverage of cathode surface by Co(OH) 2 and higher diffusion rate of metal ions towards cathode surface, respectively. Also, with increasing the cobalt content in the bath, cobalt content in the alloy coating increased anomalously and (111) texture consolidated gradually. With increasing the cobalt content up to 45% in alloy coating, the grain size decreased and consequently, hardness and strength of the alloy increased. Further enhancement of cobalt content up to 55% led to a little decrease in hardness and strength. The maximum ductility was observed for Ni–25%Co coating due to relatively small grain size and compact structure.
65 citations
23 Jun 2020
TL;DR: Vin-62 et al. as mentioned in this paper proposed an approach to solve the problem of the lack of a reliable data collection system in the context of data collection in the field of data analytics.
Abstract: Российский химико-технологический университет им. Д.И. Менделеева, Миусская пл., 9, Москва, Российская Федерация, 125047 Отдел научной информации по проблемам химии и химической технологии, ВИНИТИ РАН, ул. Усиевича, 20, Москва, Российская Федерация, 125190 Институт физической химии и электрохимии им. А.Н. Фрумкина, Ленинский пр -т., 31, к.4, Москва, Российская Федерация, 119071 E-mail: vin-62@mail.ru*
59 citations
Additional excerpts
...В1: [167, 169, 172-179, 182-191]; В2: [168, 170]; В3: [171]; В4: [180, 181]; В5: [182]; В6: [192]; В7: [193]; В8: [196, 200, 202, 207, 210, 213]; В9: [194]; В10: [198]; В11: [195]; В12: [197, 199, 201, 203, 205, 208, 212]; В13: [204, 206, 215]; В14: [209]; В15: [216]; В16: [209, 211]; В17: [217]; В18: [214]; В19: [220, 221]; В20: [218]; В21: [219, 225]; В22: [222]; В23: [226]; В24: [223]; В25: [223]; В26: [228]; В27: [224]; В28: [227]; В29: [229]....
[...]
...Таблица 10 Изменение характеристик покрытий при введении оксидов в качестве дисперсных фаз при введении карбидов в качестве дисперсных фаз 207, 210, 212-215, 217, 221, 222, 227]; J2: [168, 170, 218]; J3: [171, 223]; J4: [180, 181]; J5: [184]; J6: [192, 229]; J7: [198]; J8: [169, 174, 176, 177, 178, 184, 186, 190, 196, 208, 209, 210, 214, 217, 228]; J9: [170]; J10: [181, 195]; J11: [184, 194]; J12: [192, 211, 224]; J13: [172, 174, 177, 188, 191, 205, 208, 209, 214, 219, 220, 228]; J14: [171]; J15: [180]; J16: [216]; J17: [198]; J18: [211, 216]; J19: [175, 182, 225]; J20: [226]; J21: [182]....
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...J16: [216]; J17: [198]; J18: [211, 216]; J19: [175, 182, 225]; J20:...
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TL;DR: In this paper, the influence of Cs+ concentration on cathodic polarization curves was determined in galvanostatic and potentiodynamic measurements, and it was shown that the presence of cesium ions in the solution enhanced in some extent adsorption of Ni2+ ions on SiC, but preferential SiC adorption occurred simultaneously.
Abstract: Electrodeposition of SiC particles (technical powder) with nickel matrix in the presence of cesium ions (0–376 mM) was investigated The influence of Cs+ concentration on cathodic polarization curves was determined in galvanostatic and potentiodynamic measurements The presence of Cs+ in the solution enhanced in some extent adsorption of Ni2+ ions on SiC, but preferential cesium adsorption occurred simultaneously The last phenomenon resulted in cesium incorporation in the composite coating The particle content in the deposits (16–24 vol%) was governed by the amount of nickel ions adsorbed on SiC Structure of the composite coatings was studied by microscopic observations At highest Cs+ concentrations, incorporation of small SiC grains was inhibited Microhardness of deposits (390–800 HV) was directly dependent on the SiC content in the coatings
7 citations
23 Jul 2014
TL;DR: In this paper, the authors studied the electrodeposition of SiC nanopowder (approximately 120 nm) with nickel, cobalt, and Co-Ni alloy matrix and found that particles suspended in the bath affect slightly the reduction of metallic ions.
Abstract: Electrodeposition of SiC nanopowder (approximately 120 nm) with nickel, cobalt, and Co-Ni alloy matrix was studied. It was found that particles suspended in the bath affect slightly the reduction of metallic ions. Incorporation of the ceramic particles was governed mainly by the morphology of the matrix surface, while no strict correlation between the amount of cobalt ions adsorbed on the powder and the SiC content in the composites was found. Microhardness of nickel deposits was HV, while for cobalt-rich coatings (84–95 wt.% Co) the values were in the range of 260–290 HV, independently of the SiC content in the coatings. Fine-grained nickel deposits were characterized by good corrosion resistance, while cobalt and Co-Ni alloys showed high corrosion current densities.
4 citations
Journal Article•
TL;DR: In this paper, the influence of current density and SiC powder concentration in the bath on the kinetics of the cathodic reaction as well as composition, morphology, microhardness and corrosion resistance of Co/SiC composite coatings was determined.
Abstract: Purpose: The aim of this work was to determine the influence of current density and SiC powder concentration in the bath on the kinetics of the cathodic reaction as well as composition, morphology, microhardness and corrosion resistance of Co/SiC composite coatings. Design/methodology/approach: Co/SiC composite coatings were deposited from a chloride-sulfate bath at two current densities (0.5 and 1 A/dm 2 ) and various SiC powder concentrations (10-50 g/dm 3 ). SiC content in the composites was determined by an image analysis. The microstructure was studied using optical and atomic force microscopes. Microhardness and corrosion resistance (in H 2 SO 4 ) of the deposits were determined as a dependence on the SiC content in the coatings. Findings: SiC incorporation increased (15-36 vol%) under powder addition to the bath, but increase in the current density enhanced cobalt matrix deposition. The last one resulted in lower particles contents in the coatings accompanied by an increase in the current efficiencies. Microscopic observations of the coatings revealed uniform distribution of the particles within matrix. Microhardness of the composites was 200-280 HV. Corrosion resistance of the coatings was improved a little at higher SiC content in the composites.
4 citations
References
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Book•
15 Jun 2006TL;DR: This comprehensive reference collects fundamental theories and recent research from a wide range of fields including biology, biochemistry, physics, applied mathematics, and computer, materials, surface, and colloid science providing key references, tools, and analytical techniques for practical applications in industrial, agricultural, and forensic processes.
Abstract: This comprehensive reference collects fundamental theories and recent research from a wide range of fields including biology, biochemistry, physics, applied mathematics, and computer, materials, surface, and colloid science-providing key references, tools, and analytical techniques for practical applications in industrial, agricultural, and forensic processes, as well as in the production of natural and synthetic compounds such as foods, minerals, paints, proteins, pharmaceuticals, polymers, and soaps.
1,829 citations
TL;DR: The surface properties of a surface are influenced by the surface groups and the knowledge of their existence and of their chemistry are important for many technological processes as mentioned in this paper, which is why it is important to have knowledge of these surface groups.
Abstract: Publisher Summary The properties of a surface are influenced by the surface groups and the knowledge of their existence and of their chemistry are important for many technological processes This chapter examines the surface compounds on carbon—microcrystalline carbon, graphite, and diamond—on silica, on titania, and on alumina and silica–alumina Most important and best known among the surface compounds of carbon are those with oxygen and with sulfur Thus, two kinds of surface oxides are known Basic surface oxides are formed always when a carbon surface is freed from all surface compounds by heating in a vacuum or in an inert atmosphere and comes into contact with oxygen only after cooling to low temperatures Acidic surface oxides are formed when carbon is treated with oxygen a temperatures near its ignition point Unambiguous identification of carboxyl groups has been achieved by two reactions of the acyl chlorides: Friedel–Crafts reaction and Schmidt rearrangement
1,015 citations
TL;DR: Amorphous and single-crystal α-SiC were exposed to various oxygen sources at room temperature and X-ray photoelectron spectroscopy was used to follow changes in the surface composition and to determine the local bonding environment of the Si atoms as discussed by the authors.
Abstract: Amorphous and single-crystal α-SiC were exposed to various oxygen sources at room temperature. The oxygen sources included the residual gas in an ultrahigh vacuum environment, ambient air, ozone, and oxygen plasma. X-ray photoelectron spectroscopy (XPS) was used to follow changes in the surface composition and to determine the local bonding environment of the Si atoms. It was found that silicon oxycarbide species are formed when these SiC materials are initially exposed to oxygen. With extended exposure to ambient air, a SiO2 layer is subsequently formed over the silicon oxycarbide. However, the native oxide on the single-crystal SiC consists mainly of silicon oxycarbide species. The thicknesses of these native oxides were calculated using the XPS data.
256 citations
TL;DR: In this article, a physical model describing the codeposition mechanism of inert particles from electrolytic baths was proposed, which was based on two successive adsorption steps, and the authors demonstrated the validity of that mechanism for the co-position of alumina and copper from acidified copper sulfate plating baths.
Abstract: In 1972 Guglielmi proposed a physical model describing the codeposition mechanism of inert particles from electrolytic baths. The proposed mechanism was based on two successive adsorption steps. The present authors demonstrated the validity of that mechanism for the codeposition of alumina and copper from acidified copper sulfate plating baths. From an experimentally derived relationship between electrolytic conditions and codeposition, the importance of the reduction of copper ions adsorbed onto is shown. The influence of monovalent cations like thallium is discussed based on the mechanism proposed by Guglielmi.
134 citations