Electrolysis: processes – compositions used therein – and methods – Electrolytic erosion of a workpiece for shape or surface... – Electrolyte composition or defined electrolyte
Reexamination Certificate
2002-09-13
2004-12-28
King, Roy (Department: 1742)
Electrolysis: processes, compositions used therein, and methods
Electrolytic erosion of a workpiece for shape or surface...
Electrolyte composition or defined electrolyte
C252S062200
Reexamination Certificate
active
06835300
ABSTRACT:
BACKGROUND
The sizing, shaping, and surface finishing of metals for complex parts such as turbine blades, impellers, vessels, and the like has often proven to be a challenge. One commonly used method for shaping and finishing metals and metal alloys is etching. However, most commonly used etching solutions employ materials such as hydrofluoric acid that are hazardous to handle and difficult and expensive to dispose of. An alternative to etching is electropolishing, but there is a need for electropolishing materials and methods that achieve high surface smoothness, and are less expensive, less corrosive, and more environmentally friendly than current etching materials and methods.
BRIEF SUMMARY
An electropolishing solution effective for surface finishing of metals comprises about 75 to about 99 weight percent of an alkylene glycol; and about 1 to about 25 weight percent of a chloride salt selected from the group consisting of alkali metal chlorides, alkaline earth metal chlorides, and combinations thereof.
Other embodiments, including an electropolishing method and a method of recovering a spent electropolishing solution, are described in detail below.
REFERENCES:
patent: 2687345 (1954-08-01), Murray
patent: 3841978 (1974-10-01), Lai
patent: 3856636 (1974-12-01), Grubb
patent: 4189357 (1980-02-01), Riggs, Jr.
patent: 4269677 (1981-05-01), Blomsterberg
patent: 6352636 (2002-03-01), Wei et al.
Derwent abstract of SU 789641 B, Dec. 25, 1980.*
M. Eisenberg and R. E. DeLaRue, “Anodic polarization of titanium in nonaqueous base etching solutions” J. Electrochem. Soc. (1958), vol. 105, pp. 162-169, no month.
Chemical Abstract for SU 162395, Apr. 16, 1964.
Chemical Abstract for SU 285434, Oct. 29, 1970.
Chemical Abstract for SU 1657545, Jun. 23, 1991.
Green Kevin C.
Guilmette Paul
Kim Bang Mo
Schworm Jeffery L.
Zhu Joseph Shoulian
DiConza Paul J.
General Electric Company
King Roy
Patnode Patrick K.
Wilkins, III Harry D.
LandOfFree
Electropolishing solution and methods for its use and recovery does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electropolishing solution and methods for its use and recovery, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electropolishing solution and methods for its use and recovery will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3275624