Anodic-cathodic coating for fasteners

Details Anodic-cathodic coating for fasteners Anodic-cathodic coating for fasteners

1989-10-02

1992-04-14

Niebling, John

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

2041811, 205171, 205208, 205210, 205224, 205917, C25D 1306

Patent

active

051045079

ABSTRACT:
An electrodeposition method wherein a conductive substrate such as, for example, a metal fastener is first coated by means of an anodic electrodeposition process, then subjected to thermal curing, and then subjected to a cathodic electrodeposition process. The anodic electrodeposition process is carried out until the coating insulates the substrate at which point the coating process stops. The curing step lowers the dielectric strength of the anodically deposited coating, thereby allowing the substrate to accept a cathodically deposited top coat. The resultant coated substrate demonstrates superior corrosion resistance properties and improved cosmetic appeal.

REFERENCES:
patent: 3663383 (1972-05-01), Matsuda et al.
patent: 4175018 (1979-11-01), Gacesa
patent: 4208262 (1980-06-01), Kubo et al.
patent: 4421620 (1983-12-01), Kaylo et al.
patent: 4840715 (1989-06-01), Misawa et al.

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