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

C - Chemistry, Metallurgy

22

C

117/231, 75/77

C22C 7/00 (2006.01) C22C 18/00 (2006.01) C22C 20/00 (2006.01) C23C 2/06 (2006.01)

Patent

CA 1082006

ABSTRACT OF THE DISCLOSURE A ferrous metal strip is continuously hot-dip coated by immersing the metal strip in a hot-dip coating bath con- taining 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 form- ability in both the as coated state and after prolonged exposure to a hot humid atmosphere, have a markedly reduced susceptibility to the information of white rust, and have a reduced rate of general surface corrosion without any diminution of the mechanical properties of the coating.

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