Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1973-05-15
1976-09-07
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204 39, C25D 2104, C25D 354, C25C 318, C25C 326
Patent
active
039792676
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 flouride in a molten alkali-fluoride mixture in which the concentration of oxygen is reduced to and maintained at a 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steps of electrolysis to a carbon anode, and evacuation whereby gases released from the melt at the carbon are withdrawn are shown to prepare a salt bath, and to be usable concurrently with the plating of pure niobium at a cathode, the metal depleted from the melt being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 niobium of lesser purity maintained at a potential intermediate the potentials of the carbon anode and the niobium cathode.
REFERENCES:
patent: 2786809 (1957-03-01), Raynes
patent: 3024176 (1962-03-01), Cook
patent: 3479158 (1969-11-01), Cook
patent: 3489659 (1970-01-01), Cook et al.
Andrews R. L.
Larsen Jack
Wells Gilbert L.
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