Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Coating predominantly single metal or alloy substrate of...
Patent
1998-02-04
2000-01-04
Gorgos, Kathryn
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Coating predominantly single metal or alloy substrate of...
C25D 700
Patent
active
060106107
ABSTRACT:
The electroplating process of the present invention is a cyclical operation having at least three essentially independent steps in each cycle of operation with the independent steps carried out in sequence and consisting of stirring, sedimentation and electroplating. The sedimentation step occurs over an essentially quiescent time interval with essentially no current flow through the electrolyte and essentially no stirring so as to form a sedimentation layer of loosely contacted particulates on said cathode plate. The electroplating step follows the sedimentation step at a current density of over at least 5 A/dm.sup.2. The stirring step immediately follows the step of electroplating with the stirring operation being sufficiently vigorous to disperse the particulates in the sedimentation layer and to break up particulates bridged by metallic coating formed during the previous step of electroplating.
REFERENCES:
patent: 4908106 (1990-03-01), Takeshima et al.
Gorgos Kathryn
Lieberstein Eugene
Meller Michael N.
Wong Edna
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