Zinc-aluminum alloy coating and method of hot-dip coating

Details Zinc-aluminum alloy coating and method of hot-dip coating Zinc-aluminum alloy coating and method of hot-dip coating

1975-12-24

1977-11-01

Kendall, Ralph S.

Metal working

Plural diverse manufacturing apparatus

75178A, 427433, 427329, 427349, 428659, C23C 102

Patent

active

040563669

ABSTRACT:
A ferrous metal strip is continuously hot-dip coated by immersing the metal strip in a hot-dip coating bath containing between about 0.2 wt. percent and about 17 wt. percent aluminum, between about 0.02 wt. percent and about 0.15 wt. percent antimony while excluding lead in amounts more than 0.02 wt. percent, and the balance being essentially zinc. Smooth bright coatings are formed which are highly resistant to intergranular corrosion and blistering when exposed for an extended period to a hot humid atmosphere, have good formability in both the as coated state and after prolonged exposure to a hot humid atmosphere, have a markedly reduced susceptibility to the formation of white rust, and have a reduced rate of general surface corrosion without any diminution of the mechanical properties of the coating.

REFERENCES:
patent: 3245765 (1966-04-01), Lawson
patent: 3505042 (1970-04-01), Sievert et al.
patent: 3505043 (1970-04-01), Lee et al.
Radeker, Effect of Alloying Elements on the Properties of Hot Dip Galvanized Coatings, Edited Proceedings 7th International Conference on Hot Dip Galvanizing, Paris 1964, pp. 167-178 Pergamon Press.
Bablik, Galvanizing, Third Ed. 1950, pp. 223,224,237,238 E. & F.N. Spon Ltd.
G. W. Roberts, Metallurgia, Aug. 1961, pp. 57-66.
McGannon, The Making Shaping and Treating of Steel 9th Ed., p. 1033.

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