Results 211 to 220 of about 2,194 (234)
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An electron microscope investigation of electrolytic copper powders
Journal of Applied Electrochemistry, 1981The size and nature of copper powders deposited in conditions close to those found in production units are investigated with a scanning electron microscope. It is shown that an increase in the current density or the concentration of sulphuric acid decreases the size of the particles and makes their dendritic structure more pronounced.
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Influence of antimony impurities in electrolyte on the electrodeposition of copper powder
Soviet Powder Metallurgy and Metal Ceramics, 19671. In the presence of antimony compounds in electrolyte, antimony is codeposited on the cathode, which promotes the oxidation of the copper powder. 2. Small amounts (up to 0.5–1.0 mg·eq/liter) of antimony impurity in electrolyte favor the formation of loose deposits with a strongly developed dendritic particle structure, while larger ...
A. V. Pomosov, E. E. Marchevskaya
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Process and Properties of Ultrafine Silver-Coated Electrolytic Copper Powders
Materials Science Forum, 2017The ultrafine electrolytic copper powders were coated by silver using a combination of displacement reaction and reduction method, and the bimetallic core-shell powders with a 10wt.% addition of silver were obtained. The effects of concentration of complexing-dispersing agent and reducing agent on the silver coating layer were studied.
De Rong Meng +5 more
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A microscopic investigation of electrolytic copper powders deposited by reversing currents
Hydrometallurgy, 1994Abstract The copper powders electrodeposited by reversing current were investigated using a scanning electron microscope. The effects of the current amplitude, cathodic to anodic time ratio and period of the current wave are discussed. It is shown that the parameters determining the reversing current wave determine the micromorphology of the copper ...
M.G. Pavlović +4 more
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A study of copper coatings electrodeposited in electrolyte with a metallic powder of chromium
Surface and Coatings Technology, 2006Abstract Copper coatings modified with chromium and sulfur inclusions were electrodeposited in acidic copper sulfate electrolytes containing a metallic powder of chromium. It was found that a metallic powder of chromium is not suitable to obtain Cu–Cr composites in contrast to chemical inert particles of other non-metallic powders.
V. Medeliene˙ +3 more
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Production of electrolytic copper powders on rod electrodes with separating layers
Soviet Powder Metallurgy and Metal Ceramics, 1987Finely divided copper deposits were obtained from a sulfate electrolyte containing 30 CuSO~ and 140 g/liter H2SO4. The cathodic current density i c per unit area of the starting smooth electrode surface was 2200 A/m 2. Electrolysis was performed at a temperature of 50 I~ and an electrolyte circulation rate of 70 ml/min.
E. E. Usol'tseva +4 more
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Factors Influencing Quality of Electrolytic Copper Powder
Powder Metallurgy, 1991AbstractThe quality of electrolytically produced copper powder is influenced in the course of electrolysis by a number of factors. The most important of these include time of powder growth, current density, electrolyte concentration, concentration of sulphuric acid, temperature and circulation of the electrolyte, and the presence of foreign ions.
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Recovery of nickel powder from copper bleed electrolyte of an Indian copper smelter by electrolysis
Powder Technology, 2007Abstract When nickel concentration increases in the copper sulphate electrolyte during electrolysis, it starts electrodepositing on the copper cathode thereby affecting the purity of the copper. In order to produce high quality copper cathodes with less than 1 ppm Ni, it became necessary to bleed-off large volumes of foul electrolyte contaminated ...
Archana Agrawal +4 more
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Russian Journal of Physical Chemistry A, 2017
The possibility of the electroprecipitation of copper powder via the cathodic reduction of an electrolyte solution containing copper(II) nitrate trihydrate and dimethyl sulfoxide (DMSO) is shown. The effect electrolysis conditions (current density, concentration and temperature of electrolyte) have on the dimensional characteristics of copper powder is
Aigul’ Mamyrbekova +2 more
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The possibility of the electroprecipitation of copper powder via the cathodic reduction of an electrolyte solution containing copper(II) nitrate trihydrate and dimethyl sulfoxide (DMSO) is shown. The effect electrolysis conditions (current density, concentration and temperature of electrolyte) have on the dimensional characteristics of copper powder is
Aigul’ Mamyrbekova +2 more
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Electrodeposition of copper-tin alloy powder from a sulfamine electrolyte
Soviet Powder Metallurgy and Metal Ceramics, 19711. Conditions have been established ensuring stability of the sulfamine copper-tin electrolyte during electrolysis. 2. The optimum electrolysis parameters have been determined enabling alloys to be produced at maximum current efficiency. 3.
Ya. A. Fedyushkina, A. V. Pomosov
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