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AssigneeArmco Steel Corporation
InventorsPaul E. Schnedler, Marvin B. Pierson, Hart F. Graff, Thomas A. Compton, William R. Leasure
Estimating the term…
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. Alternatively, at least that side of the strip to be coated with the molten coating metal is coated with a flux which remains on the strip until contacted by the coating metal meniscus. 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.
In a process of producing a ferrous base metal strip having coating metal on one side only, the other side of said strip remaining free of said coating metal, said ferrous base metal strip having been subjected to chemical preparation including the application of a flux to at least said one side thereof and having been treated to bring the ferrous base metal strip to a coating temperature sufficiently high to prevent casting of said coating metal thereon and low enough to prevent excess coating metal-base metal alloying, the improvement comprising the steps of providing a coating pot containing a molten bath of said coating metal, conducting said strip to a position above the upper surface of said bath with said one side of said strip facing said bath such that the surface tension and wetting characteristics of said molten coating metal will permit the formation of a meniscus at said upper surface of said bath contacting said one side of said strip, forming said meniscus, maintaining said meniscus and continuously contact coating said one side only of said strip therewith and finishing said coating said of said strip.
Dependencies are inferred from the claim text.