Method for coating hot metal surfaces

Details Method for coating hot metal surfaces Method for coating hot metal surfaces

1988-09-12

1991-08-13

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148258, C23C 2233

Patent

active

050393600

ABSTRACT:
A method for coating a metal surface includes heating an untreated metal surface to a temperature of about 40.degree. C. to 250.degree. C. and spraying a coating composition onto the hot untreated metal surface, while continuously moving the metal surface, so that a corrosion resistant coating is formed on the surface, the coating composition having a pH of 0.5 to 1.5 and containing; (a) 20 to 40% by weight acrylic organic polymer in aqueous dispersion; (b) 1 to 5% by weight chromium in a soluble form and selected from the group of hexavalent chromium and mixtures of hexavalent and trivalent chromium wherein the trivalent is about 0.1 to 20% by weight of the total chromium in the mixture; (c) 1.5 to 4% by weight phosphoric acid; and (d) 0.1 to 1.5% by weight organic reducing agent.

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