Electrodeposition


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electrodeposition

[i¦lek·trō‚dep·ə′zish·ən]
(metallurgy)
Electrolytic process in which a metal is deposited at the cathode from a solution of its ions; includes electroplating and electroforming. Also known as electrolytic deposition.

Electrodeposition

 

(also electrolytic deposition), the deposition of a metal or an alloy at a cathode during the electrolysis of a solution or melt of the respective salt.

Crystal growth during electrodeposition has much in common with crystallization from a vapor or a solution. The factor that governs supersaturation in electrodeposition is the overvoltage that occurs at an electrode during an electrochemical reaction. Depending on the magnitude of the overvoltage, crystal growth may occur by means of spiral growth on screw dislocations, the formation and growth of two-dimensional crystal nuclei, or—at high enough overvoltages—the formation of three-dimensional nuclei. The formation and growth of two-dimensional nuclei are typical of dislocationless crystals; the formation of three-dimensional nuclei is the normal process of crystal growth.

The possibility of varying the cathodic overvoltage over a wide range makes it possible to obtain metallic layers that have markedly different properties. Thus, depending on the formation conditions for deposits, the dislocation density in a deposit may range from 106 to 1012 cm–2. Consequently, such properties as conductivity, hardness, and ductility may also be varied. High dislocation densities have been found in deposits of, for example, copper, nickel, iron, chromium, platinum, and silver.

The adsorption of surfactants and the incorporation of impurities have an especially strong effect on the structure of the metallic deposits obtained by electrodeposition.

Electrodeposition is the basis of electrometallurgy, the refining of metals, and electroplating technology.

IU. M. POLUKAROV

References in periodicals archive ?
29) Electrodeposition of composite coatings has been widely investigated for better wear resistance and dispersion stability.
Electrodeposition reaction is slow and is affected by electrochemical factors as reaction time and the yield of the process.
Double layer, diluent and anode effects upon the electrodeposition of aluminium from chloroaluminate based ionic liquids.
The extracted juices from ST tuber were used as the electrodeposition additive in different concentrations.
Specifically, magnesium and other metals are attached to a coral reef consisting primarily of iron, and a weak electrical current is generated using the differential between the ionization properties of the different metals (galvanic anode system), which promotes electrodeposition (adhesion) of the calcium content of the seawater.
Ozturk, "Fabrication of Pd-Fe Nanowires with a High Aspect Ratio by AAO Template-Assisted Electrodeposition," Journal of Alloys and Compounds, vol.
Keywords Electrodeposition, Anomalous codeposition, Surface morphology, Corrosion resistance, Ternary Zn-Ni-Fc alloy
Lead dioxide and mixed lead dioxide electrodes can be prepared by electrodeposition from acidic aqueous solutions of lead salts, usually acetates or nitrates, on a number of conducting base substrates such as gold, silver, nickel, titanium, platinum, carbon, graphite and stainless steel base substrates.
The synthesis method combines the formation of a polystyrene microsphere colloidal mono/multilayer and the electrodeposition of ZnO NWs, followed by the elimination of the polystyrene microspheres.