Ferrous product having an alloy coating thereon of Al-Zn-Mg-Si A

Details Ferrous product having an alloy coating thereon of Al-Zn-Mg-Si A Ferrous product having an alloy coating thereon of Al-Zn-Mg-Si A

1982-06-23

1983-08-30

Lewis, Michael L.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having composition, density, or hardness gradient

428650, 428653, 428658, 428659, 428939, 148127, 427433, 4273981, B32B 1518, B32B 1520

Patent

active

044017278

ABSTRACT:
A coated ferrous article with improved properties, e.g., improved overall corrosion resistance and good appearance. 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 ##EQU1## 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 10.mu., (2) zinc-rich interdendritic regions, and (3) intermetallic phases of zinc, aluminum, magnesium and silicon. The article may be produced by hot dip coating a ferrous substrate in a molten metal bath of the above composition.

REFERENCES:
patent: 3782909 (1974-01-01), Cleary et al.
patent: 4029478 (1977-06-01), Lee
patent: 4287009 (1981-09-01), Allegra et al.
patent: 4350539 (1982-09-01), Torok et al.

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