Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Forming nonmetal coating
Reexamination Certificate
2005-05-17
2005-05-17
Koehler, Robert R. (Department: 1775)
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Forming nonmetal coating
C205S082000, C205S083000, C205S106000, C205S107000, C205S333000, C204S228600, C204S229800, C204S230200, C204S230500, C204S230800, C204S237000, C204S239000
Reexamination Certificate
active
06893551
ABSTRACT:
A process for forming oxide based dense ceramic composite coatings on reactive metal and allow bodies involves suspension of at least two reactive metal or alloy bodies in a non-metallic, non-conducting, non-reactive chamber in such a way that it causes either partial or full immersion of the bodies in a continuously circulating electrolyte. Thyristor controlled, modified shaped wave multiphase alternating current power supply is applied across the bodies where in each body is connected to an electrode. Electric current supplied to the bodies is slowly increased to a particular value till the required current density is achieved and the maintained at the same level throughout the process. Visible arcing at the surface of the immersed regions of the bodies is identified when the applied electric potential crosses 60V. Electric potential is further increased gradually to compensate the increasing resistance of the coating. Electrolyte composition is regulated through the changes in pH and conductivity of the electrolytic solution, Thickness of the coating formed on the bodies is monitored by the time for which the electrical power at constant current density is supplied to the bodies. The contains obtained are found to exhibit higher density and excellent wear.
REFERENCES:
patent: 6197178 (2001-03-01), Patel et al.
Krishna Lingamaneni Rama
Rybalko Alexander Vasilyevich
Sundararajan Govindan
International Advanced Research Centre for Powder Metallurgy and
Koehler Robert R.
Venable LLP
Voorhees Catherine M.
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