Reducing or avoiding pinhole formation in autodeposition

Details Reducing or avoiding pinhole formation in autodeposition Reducing or avoiding pinhole formation in autodeposition

1989-10-30

1992-01-14

Beck, Shrive P.

Coating processes

Immersion or partial immersion

Metal base

4274301, C23C 2600

Patent

active

050809377

ABSTRACT:
Pinhole and blister formation during autodeposition coating of active metal objects, particularly galvanized steel, other zinciferous surfaces, and even ordinary steel that has been abraded, scratched, or otherwise strained, can be greatly reduced by exposing the active metal surfaces to a solution containing cystine before using a autodeposition process itself, or by adding cystine to an otherwise conventional autodeposition composition.

REFERENCES:
patent: 3592699 (1971-07-01), Steinbrecher et al.
patent: 3963796 (1976-06-01), Yokono
patent: 4108817 (1978-08-01), Lochel, Jr.
patent: 4178400 (1979-12-01), Lochel, Jr.
patent: 4199624 (1980-04-01), Smith
patent: 4242379 (1980-12-01), Hall et al.
patent: 4243704 (1981-01-01), Hall
patent: 4293592 (1981-10-01), Morishita
patent: 4373050 (1983-02-01), Steinbrecher
patent: 4647480 (1987-03-01), Ahmed

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