Method for continuously contact-coating one side only of a ferro

Coating processes – With pretreatment of the base – Metal base

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427349, 427374D, 427374E, 427432, 427433, 427434A, 204145F, 118 63, 118 65, 118419, 134 41, C23C 108, C23C 106, C23C 102

Patent

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040828689

ABSTRACT:
Method and means for continuously contact-coating one side only of a ferrous base metal strip with a molten coating metal. One or more roll means are provided to conduct the strip surface to be coated above the surface of a bath of the molten coating metal. The strip surface to be coated is caused to travel sufficiently close to the molten coating metal bath surface that the surface tension and wetting characteristics of the coating metal will permit the formation of a meniscus which will continuously contact and coat the strip surface. The coating is subjected to jet finishing. The strip is maintained in a protective non-oxidizing atmosphere at least until the one side thereof is coated. The strip may be maintained in the protective non-oxidizing atmosphere until it is sufficiently cooled to prevent the formation of a visible oxide on the uncoated side thereof. When the strip is exposed to an oxidizing atmosphere after coating and while still sufficiently hot to form a visible oxide coating on the uncoated side thereof, the strip will thereafter be subjected to acid cleaning, rinsing and drying operations.

REFERENCES:
patent: 1252363 (1918-01-01), Roberts
patent: 1496309 (1924-06-01), Girvin
patent: 2082622 (1937-06-01), Fink
patent: 2374926 (1945-05-01), Fink
patent: 2937108 (1960-05-01), Toye
patent: 3526536 (1970-09-01), Spengos et al.
patent: 3751288 (1973-08-01), Alsey et al.
patent: 3809570 (1973-05-01), Herman
patent: 3993235 (1976-11-01), Boynton
Burns & Bradley, Protective Coatings for Metals, Reinhold Publishing Corp., N.Y., 1955, pp. 29-31.

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