Autodeposition coating process

Details Autodeposition coating process Autodeposition coating process

1978-02-17

1981-01-06

Smith, Ronald H.

Coating processes

With pretreatment of the base

Metal base

4273882, 4273884, 427435, B05D 302, B05D 118

Patent

active

042437040

ABSTRACT:
In a process wherein an organic coating is formed on a metallic surface by immersing the surface in an acidic aqueous coating composition containing dispersed particles of an organic coating-forming material from which the particles are deposited on the metallic surface forming an organic coating which increases in thickness the longer the surface is immersed in the composition and wherein the temperature of the coating composition tends to rise with the result that the quality of coatings formed therefrom is affected adversely, particularly when coating worked or roughened metal surfaces, the improvement comprising maintaining the temperature of the coating composition at a temperature within the range over which the rate of change in the rate of film build is substantially constant thereby improving the quality of the coating formed by the deposition of coating-forming particles, including reducing or preventing the tendency of the composition to form coatings which contain pinholes and/or craters.

REFERENCES:
patent: 3936546 (1976-02-01), Hall

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