Chemistry: electrical and wave energy – Apparatus – Coating – forming or etching by sputtering
Patent
1989-04-24
1990-09-25
Niebling, John F.
Chemistry: electrical and wave energy
Apparatus
Coating, forming or etching by sputtering
204300R, 204300EC, 2041802, 361225, 361226, 361227, 361228, 361229, 219 6913, C25D 1322
Patent
active
049591371
ABSTRACT:
An electrocoating system with multistage voltage application includes an electrocoating bath filled with a coating material and having inlet and outlet sides, a feeding arrangement for supporting and moving an object to be immersed and coated in the electrocoating bath so that the object will serve as an electrode, electrode means including a plurality of voltage-application stages arranged successively from the inlet to outlet sides of the electrocoating bath, each of the stages having at least one electrode arranged along a path of travel of an object as moved by the feeding arrangement, power supply means for applying different independently variable voltages through the stages, respectively, and diode means for preventing the electrodes of the stages from being electrocoated with the coating material, the diode means including diodes which are forward-connected respectively between the power supply means and the electrodes of the stages. Therefore, any undesirable electric currents which would otherwise electrocoat the electrodes of the stages are prevented from flowing by the diodes.
REFERENCES:
patent: 3355375 (1967-11-01), Brewer et al.
patent: 3728242 (1973-04-01), Loop et al.
patent: 4486284 (1984-12-01), Mori et al.
Matsuoka Isamu
Sato Noboru
Burt Pamela S.
Carrier Joseph P.
Honda Giken Kogyo Kabushiki Kaisha
Niebling John F.
Ryser David G.
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