Chemistry: electrical and wave energy – Apparatus – Coating – forming or etching by sputtering
Patent
1989-11-13
1990-07-10
Niebling, John F.
Chemistry: electrical and wave energy
Apparatus
Coating, forming or etching by sputtering
204299EC, 2041802, C25D 1300, C25D 1306, C25D 1312
Patent
active
049405268
ABSTRACT:
An apparatus is provided for electrophoretically depositing paint upon a cathodic substrate, e.g., a truck body, comprising a tank having introductory and exit regions, with a coating region positioned therebetween. The coating region comprises two or more primary anode banks of different electrical potential, the potential of the banks nearer the exit region being successively greater than those of preceding banks. An auxiliary anode bank is positioned between primary banks of different potential, the auxiliary bank being maintained at approximately the same electrical potential as the adjacent lower potential primary bank. Diodes are provided to prevent current flow between lower potential primary anodes, and between auxiliary anodes, through conductor means electrically coupling the anodes together. The subject apparatus reduces current flow from a higher potential bank to a lower potential bank, thus reducing paint deposition upon and subsequent fouling of the anodes of the latter.
REFERENCES:
patent: 4210505 (1980-07-01), Todoroki et al.
patent: 4486284 (1984-12-01), Mori et al.
patent: 4824538 (1989-04-01), Hibino et al.
patent: 4844783 (1989-07-01), Takahashi et al.
"Design Considerations for the Use of PPG Uni-Prime.RTM. and Cathodic Electrocoat in Body Systems", p. 79, teaching materials from a Feb. 2-3, 1989 course offered by Pittsburgh Paint and Glass.
Wismer et al., "Cathodic Electrodeposition", Journal of Coatings Technology, vol. 54, No. 688, May 1982, pp. 35-44.
General Motors Corporation
Niebling John F.
Plant Lawrence B.
Starsiak Jr. John S.
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