INTERACTION OF MERCURY WITH AMORPHOUS AND CRYSTALLINE ALLOYS OF IRON AND COBALT WITH PHOSPHORUS IN THEIR ELECTRODEPOSITION PROCESS
V.V. Bondar'
Dept. of Chemistry, All-Russian Inst. of Scientific and Technical Information, 20 Usievich St., Moscow, 125219 Russia, bvv@viniti.msk.su
Keywords: electrodeposition process,
interaction of mercury, alloys of iron and cobalt, phosphorus
Precipitates having a glitter surface, sometimes having even a mirror surface, form often at electrodeposition of alloys of simple electrolytes containing no additives.
As a rule, a glitter or semiglitter surface having no visible elements or having a microsamotoide structure according to the electron microscopy data is typical for electrodeposited amorphous alloys. In particular, it relates to the case of deposition of iron, cobalt and nickel alloys with phosphorus in the amorphous precipitate formation region (more than 13 at.% of phosphorus). But the precipitates of these alloys containing 8 - 13 at.% of phosphorus having a crystalline structure are glitter also. It was reasonable to suggest that at the electrolysis process the amorphous layers of the alloy formed initially in this interval of compositions, and a phase transition temperature into a crystalline state of these layers was lower than that of the room, this lead to their further crystallization.
In order to verify this suggestion a combined two-phase electrode consisting of a mercury drop and a platinum (iron, cobalt and another) wire in contact with it was used. In the potentiostatics regime the electrodeposition of a metal or an alloy on such an electrode takes place only on the wire, as the process does not practically proceed on the mercury because of higher charge overpotential of the metal ions.
Investigating the deposition of cobalt, iron and their alloys with phosphorus on the combined electrode three types of interaction of the precipitates with mercury were found:
By such a way, the results obtained can be indirect
confirmation of formation of the electrolytic layers through an
amorphous phase with its following crystallization.
Vladimir V. Bondar', Professor
Department of Chemistry,
All-Russian Institute of Scientific and Technical Information, Usievicha Str. 20A, Moscow 125319, Russia
E-mail goe@viniti.msk.su
Phone: (095) 1525981
Fax : (095) 9430060
Abstract title: INTERACTION OF MERCURY WITH AMORPHOUS AND
CRYSTALLINE ALLOYS OF IRON AND COBALT WITH PHOSPHORUS IN THEIR
ELECTRODEPOSITION
Preferred form of presentation: Poster
Collected Abstract only
Topics C1,
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Sincerely yours
Prof. Bondar'
28.04.1998