Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1992-12-23
1995-09-19
Breneman, R. Bruce
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
20412925, 2041294, 2041295, 216100, H01L 2100
Patent
active
054512999
ABSTRACT:
The invention provides method and apparatus for chemical milling of a metal part in a milling solution that reduces hydrogen absorption by the part wherein, the metal part to be milled, which serves as the anode, and a cathode of more noble metal than the anode, are mounted in such solution. Unlike the prior art, the cathode and anode are separated in such solution but electrically connected by a conductor therebetween, which conductor is insulated from the milling solution. Thus anode and cathode are mounted, spaced apart in the milling solution, so that metal dissolves from the anode surface, milling such part while electrons flow from anode to cathode by said conductor so that hydrogen forms at the cathode, removed from the anode part, to reduce hydrogen absorption by such part.
The anode part can be of, eg. titanium and the cathode of a more noble metal, eg. platinum, which serves to draw the hydrogen to the cathode and away from the anode part, preventing or reducing absorption of hydrogen into, eg. the titanium part and consequent hydrogen embrittlement thereof, which occurs in the prior art.
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"Inorganic Chemistry"; Huheey; .COPYRGT.1978; Harper & Row Publishers; pp. 312-313.
Hodgens, II Henry M.
Privett, III Hugh M.
Breneman R. Bruce
Goudreau George
Singer Donald J.
Stover Thomas C.
The United States of America as represented by the Secretary of
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