Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Treating process fluid by means other than agitation or...
Patent
1993-02-26
1994-04-19
Tufariello, T. M.
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Treating process fluid by means other than agitation or...
205125, 204232, C25D 502, C25D 1700
Patent
active
053042972
ABSTRACT:
A system is provided for regenerating reducing agents used in ancillary chemical or electrochemical processes such as restoring solderability of electronic components. The system includes a cathode, an anode, and an electrolyte system that is separated by a semipermeable ionic barrier into a catholyte and an anolyte. The catholyte includes the reduced member of a redox couple, which can be regenerated electrochemically. The redox couple of the electrolyte system is charged like a battery and discharged during the ancillary process. Regeneration of the reduced member of the redox couple is accomplished at the cathode. The cathode comprises an electrode having a high hydrogen overvoltage so that sufficiently negative potentials can be attained while minimizing hydrogen evolution. Chemical balance is maintained by the semipermeable ionic barrier, which permits proton migration from the anolyte to the catholyte but acts as a barrier against diffusion and migration of cations from the catholyte to the anolyte. Ideally, the anodic reaction is breakdown of water to form oxygen, which is vented, and protons that migrate across the ionic barrier to the catholyte replacing protons consumed in the ancillary process. The overall reaction in a system for restoring solderability of electronic components is reduction of metallic oxide to metal and release of oxygen, with no net chemical change in the composition of the regeneration system.
REFERENCES:
patent: 5104494 (1992-04-01), Tench et al.
Anderson Dennis P.
Tench D. Morgan
Warren, Jr. Leslie F.
McFarren John C.
Rockwell International Corporation
Tufariello T. M.
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