C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
117/103.1
C23C 1/02 (1980.01)
Patent
CA 1083437
Abstract of the Disclosure This application describes an improved method of forming a zinc-aluminum coating a ferrous base which comprises passing the ferrous base through a protective hood and into a molten bath consisting essentially of from 25% to 70% by weight aluminum, balance substantially zinc, continuously subjecting the ferrous base and the portion of the surface of said molten bath within said protective hood to a hot gas which when introduced into said protective hood has a temperature of at least 750°F, the gas comprising at least 6% by volume of hydrogen, balance essentially nitrogen, and having a dewpoint no greater than -100°F, and wherein a portion at least of said hot gas is first caused to sweep across the surface of the bath adjacent the region of entry of the ferrous base and then to flow countercurrent to the direction of movement of said ferrous base.
294010
Caldwell Laurence B.
Connolly James J.
Bethlehem Steel Corporation
Kirby Eades Gale Baker
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