Mechanism of the cathode process in the electrolytic boriding in molten salts

Autor:	Pavel Fellner, M. Makyta, K. Matiašovský
Rok vydání:	1984
Předmět:	Tetrafluoroborate General Chemical Engineering Inorganic chemistry chemistry.chemical_element Electrolyte Electrochemistry chemistry.chemical_compound chemistry Boron oxide Boron Platinum Fluoride Boriding
Zdroj:	Electrochimica Acta. 29:1653-1657
ISSN:	0013-4686
DOI:	10.1016/0013-4686(84)89006-4
Popis:	The mechanism of the cathode process in the electrolytic deposition of boron on a platinum electrode has been investigated in the systems LiFKFKBF 4 and LiFKFB 2 O 3 by means of the voltametric and chronopotentiometric methods. It was found that in the system LiFKFKBF 4 boron is reduced directly from the tetrafluoroborate complex anion by a simple 3-electron process. In the system LiFKFB 2 O 3 boron oxide reacts with the basic fluoride electrolyte under formation of the BF − 4 anion and of unspecified oxofluoro complex(es) with a mean oxygen to boron ratio of 1.66. The ratio of boron concentrations in the BF − 4 anion and in the oxofluoro complex(es) is about 0.1. The difference between the deposition potential of boron from those two electrochemically active species is about 0.47 V in favour of BF − 4 . The value of the diffusion coefficient of the BF − 4 anion was found to be 4.4 × 10 −9 m 2 s −1 (700°C).
Databáze:	OpenAIRE
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