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 ?
The electrodeposited Ni-P deposits had a fully bright appearance identical to that of electroless Ni-P and appeared to have a relatively low surface roughness.
Electrodeposits of PbO2 and PbO2 + Ce2O3 on Stainless Steel: Potential - Current responses for the electrodeposition of Lead dioxide on stainless steel with and without incorporation of Cerium oxide from Lead nitrate 10 mM and Lead nitrate 10 mM containing Cerium nitrate 1 mM and 0.1 mM electrolytes are shown in Figure 1 and the corresponding E vs.
"As supple as a Slinky toy, the electrodeposited metal bellows follows the circulatory path yet seals the angioplasty 'eye' perfectly."
It is expected that measurements such as these will allow the researchers to determine the root cause of stress in electrodeposited thin films and to propose mitigation strategies.
Compared with spring-loaded pogo pins, wire mesh cylinders or pads, and bent spring-lever contacts, electrodeposited bellows remain a premium-priced solution to difficult design requirements, such as: a microchip tester needing a contact probe with extra-low spring forces to make consistent electrical contact with test pieces yet protect delicate microcircuits; laser electronics requiring flexible interconnections to maintain continuity between circuit boards should the boards expand, contract, or twist with changing temperature; or battlefield electronics needing ultra-reliable, long-life pushbutton switches sealed against a dusty, dirty, wet environment.
The base coating A and the clear coating containing P3OT was sprayed in turn on a steel plate on which an electrodeposited coat and a surfacer coat had already been painted.
Choi et al., "High-activity electrodeposited NiW catalysts for hydrogen evolution in alkaline water electrolysis," Applied Surface Science, vol.
After researching many materials combinations, GE realized and patented a fabrication process and electrodeposited alloys whose mechanical properties are very close to silicon and have the conductivity of a metal.
In the electrodeposited sample, the presence of Mn[O.sub.2] is clearly observed and is consistent with those presented in other studies [10, 17, 18].