Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1976-02-10
1980-11-25
Mack, John H.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204294, 204 64R, 204247, C25D 2112, C25C 308, C25C 322
Patent
active
042356920
ABSTRACT:
It has been known that metals of groups IV-B, V-B, and VI-B of the periodic table, namely chromium, hafnium, molybdenum, niobium, tantalum, titanium, tungsten, vanadium, and zirconium and alloys thereof can be electrodeposited as dense, structurally coherent plates from a solution of the refractory metal fluoride in a molten alkali-flouride mixture in which the concentration of oxygen is reduced to and maintained at the sufficiently low level. It is shown that niobium may be plated at a lower temperature and a higher rate when the oxygen concentration is reduced to lower levels than previously attainable. The concurrent steps of electrolysis is a carbon anode, and evacuation whereby gases released from the melt at the carbon are withdrawn are shown to prepare a salt bath, and to be usable concurrently with the plating of pure niobium at a cathode, the metal depleted from the melt being replenished from a body of nobium of lesser purity maintained at a potential intermediate the potentials of the carbon anode and the niobium cathode.
REFERENCES:
patent: 1905866 (1933-04-01), Heany
patent: 2783195 (1957-02-01), Raynes et al.
patent: 3206385 (1965-09-01), Meiklejohn et al.
patent: 3282806 (1966-11-01), Long et al.
patent: 3417002 (1968-12-01), Leary et al.
Mack John H.
Valentine D. R.
Wells Gilbert L.
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