C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
117/118
C23C 2/06 (2006.01) B32B 15/01 (2006.01)
Patent
CA 1204970
FERROUS PRODUCT HAVING AN ALLOY COATING THEREON OF AL-ZN-MG-SI ALLOY, AND METHOD Abstract of the Disclosure A coated ferrous article with improved properties, e.g., improved overall corrosion resistance and good appear- ance. The article has a ferrous substrate and a ductile, adherent, corrosion resistant alloy coating metallurgically bonded to the substrate. The alloy coating has a thin intermetallic alloy layer intermediate the substrate and an alloy overlay. The alloy overlay consists essentially of, by weight, magnesium from 3% to 20%, silicon from 3% to 15%, balance aluminum and zinc, where the Image is between 1 and 1.5. The metallurgical structure of the overlay is a mixture of (1) cored aluminum-rich dendrites having dendrite arm spacings (DAS) of less than 10µ, (2) zinc-rich inter- dendritic regions, and (3) intermetallic phases of zinc, aluminum, magnesium and silicon. The article may be pro- duced by hot dip coating a ferrous substrate in a molten metal bath of the above composition. -1-
429104
Berke Neal S.
Townsend Herbert E.
Bethlehem Steel Corporation
Smart & Biggar
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